Merge pull request #1214 from eikek/feature/notifications

Add support for more generic notification

.redocly.lint-ignore.yaml

@@ -0,0 +1,5 @@
+# This file instructs Redocly's linter to ignore the rules contained for specific parts of your API.
+# See https://redoc.ly/docs/cli/ for more information.
+modules/restapi/src/main/resources/docspell-openapi.yml:
+  spec:
+    - '#/extraSchemas'

build.sbt

@@ -20,7 +20,7 @@ val scalafixSettings = Seq(
 
 val sharedSettings = Seq(
   organization := "com.github.eikek",
-  scalaVersion := "2.13.6",
+  scalaVersion := "2.13.7",
   organizationName := "Eike K. & Contributors",
   licenses += ("AGPL-3.0-or-later", url(
     "https://spdx.org/licenses/AGPL-3.0-or-later.html"
@@ -41,7 +41,8 @@ val sharedSettings = Seq(
     "-Wdead-code",
     "-Wunused",
     "-Wvalue-discard",
-    "-Wnumeric-widen"
+    "-Wnumeric-widen",
+    "-Ywarn-macros:after"
   ),
   javacOptions ++= Seq("-target", "1.8", "-source", "1.8"),
   LocalRootProject / toolsPackage := {
@@ -272,6 +273,22 @@ val openapiScalaSettings = Seq(
                 )
               )
             )
+      case "channeltype" =>
+        field =>
+          field.copy(typeDef =
+            TypeDef("ChannelType", Imports("docspell.notification.api.ChannelType"))
+          )
+      case "eventtype" =>
+        field =>
+          field.copy(typeDef =
+            TypeDef("EventType", Imports("docspell.notification.api.EventType"))
+          )
+
+      case "jsonminiq" =>
+        field =>
+          field.copy(typeDef =
+            TypeDef("JsonMiniQuery", Imports("docspell.jsonminiq.JsonMiniQuery"))
+          )
     })
 )
 
@@ -385,6 +402,34 @@ val totp = project
         Dependencies.circe
   )
 
+val jsonminiq = project
+  .in(file("modules/jsonminiq"))
+  .disablePlugins(RevolverPlugin)
+  .settings(sharedSettings)
+  .settings(testSettingsMUnit)
+  .settings(
+    name := "docspell-jsonminiq",
+    libraryDependencies ++=
+      Dependencies.circeCore ++
+        Dependencies.catsParse ++
+        Dependencies.circe.map(_ % Test)
+  )
+
+val notificationApi = project
+  .in(file("modules/notification/api"))
+  .disablePlugins(RevolverPlugin)
+  .settings(sharedSettings)
+  .settings(testSettingsMUnit)
+  .settings(
+    name := "docspell-notification-api",
+    addCompilerPlugin(Dependencies.kindProjectorPlugin),
+    libraryDependencies ++=
+      Dependencies.fs2 ++
+        Dependencies.emilCommon ++
+        Dependencies.circeGenericExtra
+  )
+  .dependsOn(common)
+
 val store = project
   .in(file("modules/store"))
   .disablePlugins(RevolverPlugin)
@@ -408,7 +453,27 @@ val store = project
     libraryDependencies ++=
       Dependencies.testContainer.map(_ % Test)
   )
-  .dependsOn(common, query.jvm, totp, files)
+  .dependsOn(common, query.jvm, totp, files, notificationApi, jsonminiq)
+
+val notificationImpl = project
+  .in(file("modules/notification/impl"))
+  .disablePlugins(RevolverPlugin)
+  .settings(sharedSettings)
+  .settings(testSettingsMUnit)
+  .settings(
+    name := "docspell-notification-impl",
+    addCompilerPlugin(Dependencies.kindProjectorPlugin),
+    libraryDependencies ++=
+      Dependencies.fs2 ++
+        Dependencies.emil ++
+        Dependencies.emilMarkdown ++
+        Dependencies.http4sClient ++
+        Dependencies.http4sCirce ++
+        Dependencies.http4sDsl ++
+        Dependencies.yamusca ++
+        Dependencies.yamuscaCirce
+  )
+  .dependsOn(notificationApi, store, jsonminiq)
 
 val pubsubApi = project
   .in(file("modules/pubsub/api"))
@@ -522,13 +587,13 @@ val restapi = project
   .settings(
     name := "docspell-restapi",
     libraryDependencies ++=
-      Dependencies.circe,
+      Dependencies.circe ++ Dependencies.emil,
     openapiTargetLanguage := Language.Scala,
     openapiPackage := Pkg("docspell.restapi.model"),
     openapiSpec := (Compile / resourceDirectory).value / "docspell-openapi.yml",
     openapiStaticGen := OpenApiDocGenerator.Redoc
   )
-  .dependsOn(common, query.jvm)
+  .dependsOn(common, query.jvm, notificationApi, jsonminiq)
 
 val joexapi = project
   .in(file("modules/joexapi"))
@@ -564,7 +629,7 @@ val backend = project
         Dependencies.http4sClient ++
         Dependencies.emil
   )
-  .dependsOn(store, joexapi, ftsclient, totp, pubsubApi)
+  .dependsOn(store, notificationApi, joexapi, ftsclient, totp, pubsubApi)
 
 val oidc = project
   .in(file("modules/oidc"))
@@ -656,7 +721,8 @@ val joex = project
     joexapi,
     restapi,
     ftssolr,
-    pubsubNaive
+    pubsubNaive,
+    notificationImpl
   )
 
 val restserver = project
@@ -720,7 +786,17 @@ val restserver = project
       }
     }
   )
-  .dependsOn(config, restapi, joexapi, backend, webapp, ftssolr, oidc, pubsubNaive)
+  .dependsOn(
+    config,
+    restapi,
+    joexapi,
+    backend,
+    webapp,
+    ftssolr,
+    oidc,
+    pubsubNaive,
+    notificationImpl
+  )
 
 // --- Website Documentation
 
@@ -811,10 +887,13 @@ val root = project
     restserver,
     query.jvm,
     query.js,
+    jsonminiq,
     totp,
     oidc,
     pubsubApi,
-    pubsubNaive
+    pubsubNaive,
+    notificationApi,
+    notificationImpl
   )
 
 // --- Helpers

modules/backend/src/main/scala/docspell/backend/AttachedEvent.scala

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.backend
+
+import docspell.common._
+import docspell.notification.api.Event
+
+trait AttachedEvent[R] {
+
+  def value: R
+
+  def event(account: AccountId, baseUrl: Option[LenientUri]): Iterable[Event]
+
+  def map[U](f: R => U): AttachedEvent[U]
+}
+
+object AttachedEvent {
+
+  def only[R](v: R): AttachedEvent[R] =
+    new AttachedEvent[R] {
+      val value = v
+      def event(account: AccountId, baseUrl: Option[LenientUri]): Iterable[Event] =
+        Iterable.empty[Event]
+
+      def map[U](f: R => U): AttachedEvent[U] =
+        only(f(v))
+    }
+
+  def apply[R](
+      v: R
+  )(mkEvent: (AccountId, Option[LenientUri]) => Event): AttachedEvent[R] =
+    new AttachedEvent[R] {
+      val value = v
+      def event(account: AccountId, baseUrl: Option[LenientUri]): Iterable[Event] =
+        Some(mkEvent(account, baseUrl))
+
+      def map[U](f: R => U): AttachedEvent[U] =
+        apply(f(v))(mkEvent)
+    }
+}

modules/backend/src/main/scala/docspell/backend/BackendApp.scala

@@ -14,12 +14,13 @@ import docspell.backend.msg.JobQueuePublish
 import docspell.backend.ops._
 import docspell.backend.signup.OSignup
 import docspell.ftsclient.FtsClient
+import docspell.notification.api.{EventExchange, NotificationModule}
 import docspell.pubsub.api.PubSubT
 import docspell.store.Store
 import docspell.store.usertask.UserTaskStore
 import docspell.totp.Totp
 
-import emil.javamail.{JavaMailEmil, Settings}
+import emil.Emil
 
 trait BackendApp[F[_]] {
 
@@ -46,19 +47,22 @@ trait BackendApp[F[_]] {
   def totp: OTotp[F]
   def share: OShare[F]
   def pubSub: PubSubT[F]
+  def events: EventExchange[F]
+  def notification: ONotification[F]
 }
 
 object BackendApp {
 
   def create[F[_]: Async](
-      cfg: Config,
       store: Store[F],
+      javaEmil: Emil[F],
       ftsClient: FtsClient[F],
-      pubSubT: PubSubT[F]
+      pubSubT: PubSubT[F],
+      notificationMod: NotificationModule[F]
   ): Resource[F, BackendApp[F]] =
     for {
       utStore <- UserTaskStore(store)
-      queue <- JobQueuePublish(store, pubSubT)
+      queue <- JobQueuePublish(store, pubSubT, notificationMod)
       totpImpl <- OTotp(store, Totp.default)
       loginImpl <- Login[F](store, Totp.default)
       signupImpl <- OSignup[F](store)
@@ -75,8 +79,6 @@ object BackendApp {
       itemImpl <- OItem(store, ftsClient, createIndex, queue, joexImpl)
       itemSearchImpl <- OItemSearch(store)
       fulltextImpl <- OFulltext(itemSearchImpl, ftsClient, store, queue, joexImpl)
-      javaEmil =
-        JavaMailEmil(Settings.defaultSettings.copy(debug = cfg.mailDebug))
       mailImpl <- OMail(store, javaEmil)
       userTaskImpl <- OUserTask(utStore, queue, joexImpl)
       folderImpl <- OFolder(store)
@@ -86,6 +88,7 @@ object BackendApp {
       shareImpl <- Resource.pure(
         OShare(store, itemSearchImpl, simpleSearchImpl, javaEmil)
       )
+      notifyImpl <- ONotification(store, notificationMod)
     } yield new BackendApp[F] {
       val pubSub = pubSubT
       val login = loginImpl
@@ -110,5 +113,7 @@ object BackendApp {
       val clientSettings = clientSettingsImpl
       val totp = totpImpl
       val share = shareImpl
+      val events = notificationMod
+      val notification = notifyImpl
     }
 }

modules/backend/src/main/scala/docspell/backend/Config.scala

@@ -10,12 +10,18 @@ import docspell.backend.signup.{Config => SignupConfig}
 import docspell.common._
 import docspell.store.JdbcConfig
 
+import emil.javamail.Settings
+
 case class Config(
     mailDebug: Boolean,
     jdbc: JdbcConfig,
     signup: SignupConfig,
     files: Config.Files
-) {}
+) {
+
+  def mailSettings: Settings =
+    Settings.defaultSettings.copy(debug = mailDebug)
+}
 
 object Config {
 

modules/backend/src/main/scala/docspell/backend/JobFactory.scala

@@ -9,10 +9,29 @@ package docspell.backend
 import cats.effect._
 import cats.implicits._
 
+import docspell.backend.MailAddressCodec
 import docspell.common._
+import docspell.notification.api.ChannelOrRef._
+import docspell.notification.api.PeriodicQueryArgs
 import docspell.store.records.RJob
 
-object JobFactory {
+object JobFactory extends MailAddressCodec {
+  def periodicQuery[F[_]: Sync](args: PeriodicQueryArgs, submitter: AccountId): F[RJob] =
+    for {
+      id <- Ident.randomId[F]
+      now <- Timestamp.current[F]
+      job = RJob.newJob(
+        id,
+        PeriodicQueryArgs.taskName,
+        submitter.collective,
+        args,
+        s"Running periodic query, notify via ${args.channel.channelType}",
+        now,
+        submitter.user,
+        Priority.Low,
+        None
+      )
+    } yield job
 
   def makePageCount[F[_]: Sync](
       args: MakePageCountArgs,

modules/backend/src/main/scala/docspell/backend/MailAddressCodec.scala

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.backend
+
+import emil._
+import emil.javamail.syntax._
+import io.circe.{Decoder, Encoder}
+
+trait MailAddressCodec {
+
+  implicit val jsonEncoder: Encoder[MailAddress] =
+    Encoder.encodeString.contramap(_.asUnicodeString)
+
+  implicit val jsonDecoder: Decoder[MailAddress] =
+    Decoder.decodeString.emap(MailAddress.parse)
+}
+
+object MailAddressCodec extends MailAddressCodec

modules/backend/src/main/scala/docspell/backend/auth/Login.scala

@@ -275,8 +275,8 @@ object Login {
           token <- RememberToken.user(rme.id, config.serverSecret)
         } yield token
 
-      private def check(given: String)(data: QLogin.Data): Boolean = {
+      private def check(givenPass: String)(data: QLogin.Data): Boolean = {
-        val passOk = BCrypt.checkpw(given, data.password.pass)
+        val passOk = BCrypt.checkpw(givenPass, data.password.pass)
         checkNoPassword(data, Set(AccountSource.Local)) && passOk
       }
 

modules/backend/src/main/scala/docspell/backend/msg/JobQueuePublish.scala

@@ -10,19 +10,36 @@ import cats.effect._
 import cats.implicits._
 
 import docspell.common.{Duration, Ident, Priority}
+import docspell.notification.api.Event
+import docspell.notification.api.EventSink
 import docspell.pubsub.api.PubSubT
 import docspell.store.Store
 import docspell.store.queue.JobQueue
 import docspell.store.records.RJob
 
-final class JobQueuePublish[F[_]: Sync](delegate: JobQueue[F], pubsub: PubSubT[F])
+final class JobQueuePublish[F[_]: Sync](
-    extends JobQueue[F] {
+    delegate: JobQueue[F],
+    pubsub: PubSubT[F],
+    eventSink: EventSink[F]
+) extends JobQueue[F] {
 
   private def msg(job: RJob): JobSubmitted =
     JobSubmitted(job.id, job.group, job.task, job.args)
 
+  private def event(job: RJob): Event.JobSubmitted =
+    Event.JobSubmitted(
+      job.id,
+      job.group,
+      job.task,
+      job.args,
+      job.state,
+      job.subject,
+      job.submitter
+    )
+
   private def publish(job: RJob): F[Unit] =
-    pubsub.publish1(JobSubmitted.topic, msg(job)).as(())
+    pubsub.publish1(JobSubmitted.topic, msg(job)).as(()) *>
+      eventSink.offer(event(job))
 
   def insert(job: RJob) =
     delegate.insert(job).flatTap(_ => publish(job))
@@ -54,6 +71,10 @@ final class JobQueuePublish[F[_]: Sync](delegate: JobQueue[F], pubsub: PubSubT[F
 }
 
 object JobQueuePublish {
-  def apply[F[_]: Async](store: Store[F], pubSub: PubSubT[F]): Resource[F, JobQueue[F]] =
+  def apply[F[_]: Async](
-    JobQueue(store).map(q => new JobQueuePublish[F](q, pubSub))
+      store: Store[F],
+      pubSub: PubSubT[F],
+      eventSink: EventSink[F]
+  ): Resource[F, JobQueue[F]] =
+    JobQueue(store).map(q => new JobQueuePublish[F](q, pubSub, eventSink))
 }

modules/backend/src/main/scala/docspell/backend/ops/OCustomFields.scala

@@ -12,6 +12,7 @@ import cats.data.{NonEmptyList => Nel}
 import cats.effect._
 import cats.implicits._
 
+import docspell.backend.AttachedEvent
 import docspell.backend.ops.OCustomFields.CustomFieldData
 import docspell.backend.ops.OCustomFields.CustomFieldOrder
 import docspell.backend.ops.OCustomFields.FieldValue
@@ -20,6 +21,7 @@ import docspell.backend.ops.OCustomFields.RemoveValue
 import docspell.backend.ops.OCustomFields.SetValue
 import docspell.backend.ops.OCustomFields.SetValueResult
 import docspell.common._
+import docspell.notification.api.Event
 import docspell.store.AddResult
 import docspell.store.Store
 import docspell.store.UpdateResult
@@ -53,12 +55,15 @@ trait OCustomFields[F[_]] {
   def delete(coll: Ident, fieldIdOrName: Ident): F[UpdateResult]
 
   /** Sets a value given a field an an item. Existing values are overwritten. */
-  def setValue(item: Ident, value: SetValue): F[SetValueResult]
+  def setValue(item: Ident, value: SetValue): F[AttachedEvent[SetValueResult]]
 
-  def setValueMultiple(items: Nel[Ident], value: SetValue): F[SetValueResult]
+  def setValueMultiple(
+      items: Nel[Ident],
+      value: SetValue
+  ): F[AttachedEvent[SetValueResult]]
 
   /** Deletes a value for a given field an item. */
-  def deleteValue(in: RemoveValue): F[UpdateResult]
+  def deleteValue(in: RemoveValue): F[AttachedEvent[UpdateResult]]
 
   /** Finds all values to the given items */
   def findAllValues(itemIds: Nel[Ident]): F[List[FieldValue]]
@@ -196,13 +201,13 @@ object OCustomFields {
         UpdateResult.fromUpdate(store.transact(update.getOrElse(0)))
       }
 
-      def setValue(item: Ident, value: SetValue): F[SetValueResult] =
+      def setValue(item: Ident, value: SetValue): F[AttachedEvent[SetValueResult]] =
         setValueMultiple(Nel.of(item), value)
 
       def setValueMultiple(
           items: Nel[Ident],
           value: SetValue
-      ): F[SetValueResult] =
+      ): F[AttachedEvent[SetValueResult]] =
         (for {
           field <- EitherT.fromOptionF(
             store.transact(RCustomField.findByIdOrName(value.field, value.collective)),
@@ -224,17 +229,24 @@ object OCustomFields {
               .traverse(item => store.transact(RCustomField.setValue(field, item, fval)))
               .map(_.toList.sum)
           )
-        } yield nu).fold(identity, _ => SetValueResult.success)
+          mkEvent =
+            Event.SetFieldValue.partial(items, field.id, fval)
 
-      def deleteValue(in: RemoveValue): F[UpdateResult] = {
+        } yield AttachedEvent(SetValueResult.success)(mkEvent))
+          .fold(AttachedEvent.only, identity)
+
+      def deleteValue(in: RemoveValue): F[AttachedEvent[UpdateResult]] = {
         val update =
-          for {
+          (for {
             field <- OptionT(RCustomField.findByIdOrName(in.field, in.collective))
             _ <- OptionT.liftF(logger.debug(s"Field found by '${in.field}': $field"))
             n <- OptionT.liftF(RCustomFieldValue.deleteValue(field.id, in.item))
-          } yield n
+            mkEvent = Event.DeleteFieldValue.partial(in.item, field.id)
+          } yield AttachedEvent(n)(mkEvent))
+            .getOrElse(AttachedEvent.only(0))
+            .map(_.map(UpdateResult.fromUpdateRows))
 
-        UpdateResult.fromUpdate(store.transact(update.getOrElse(0)))
+        store.transact(update)
       }
 
     })

modules/backend/src/main/scala/docspell/backend/ops/OItem.scala

@@ -6,15 +6,17 @@
 
 package docspell.backend.ops
 
-import cats.data.{NonEmptyList, OptionT}
+import cats.data.{NonEmptyList => Nel, OptionT}
 import cats.effect.{Async, Resource}
 import cats.implicits._
 
+import docspell.backend.AttachedEvent
 import docspell.backend.JobFactory
 import docspell.backend.fulltext.CreateIndex
 import docspell.backend.item.Merge
 import docspell.common._
 import docspell.ftsclient.FtsClient
+import docspell.notification.api.Event
 import docspell.store.queries.{QAttachment, QItem, QMoveAttachment}
 import docspell.store.queue.JobQueue
 import docspell.store.records._
@@ -26,42 +28,54 @@ import org.log4s.getLogger
 trait OItem[F[_]] {
 
   /** Sets the given tags (removing all existing ones). */
-  def setTags(item: Ident, tagIds: List[String], collective: Ident): F[UpdateResult]
+  def setTags(
+      item: Ident,
+      tagIds: List[String],
+      collective: Ident
+  ): F[AttachedEvent[UpdateResult]]
 
   /** Sets tags for multiple items. The tags of the items will be replaced with the given
     * ones. Same as `setTags` but for multiple items.
     */
   def setTagsMultipleItems(
-      items: NonEmptyList[Ident],
+      items: Nel[Ident],
       tags: List[String],
       collective: Ident
-  ): F[UpdateResult]
+  ): F[AttachedEvent[UpdateResult]]
 
   /** Create a new tag and add it to the item. */
-  def addNewTag(item: Ident, tag: RTag): F[AddResult]
+  def addNewTag(collective: Ident, item: Ident, tag: RTag): F[AttachedEvent[AddResult]]
 
   /** Apply all tags to the given item. Tags must exist, but can be IDs or names. Existing
     * tags on the item are left unchanged.
     */
-  def linkTags(item: Ident, tags: List[String], collective: Ident): F[UpdateResult]
+  def linkTags(
+      item: Ident,
+      tags: List[String],
+      collective: Ident
+  ): F[AttachedEvent[UpdateResult]]
 
   def linkTagsMultipleItems(
-      items: NonEmptyList[Ident],
+      items: Nel[Ident],
       tags: List[String],
       collective: Ident
-  ): F[UpdateResult]
+  ): F[AttachedEvent[UpdateResult]]
 
   def removeTagsMultipleItems(
-      items: NonEmptyList[Ident],
+      items: Nel[Ident],
       tags: List[String],
       collective: Ident
-  ): F[UpdateResult]
+  ): F[AttachedEvent[UpdateResult]]
 
   /** Toggles tags of the given item. Tags must exist, but can be IDs or names. */
-  def toggleTags(item: Ident, tags: List[String], collective: Ident): F[UpdateResult]
+  def toggleTags(
+      item: Ident,
+      tags: List[String],
+      collective: Ident
+  ): F[AttachedEvent[UpdateResult]]
 
   def setDirection(
-      item: NonEmptyList[Ident],
+      item: Nel[Ident],
       direction: Direction,
       collective: Ident
   ): F[UpdateResult]
@@ -69,13 +83,13 @@ trait OItem[F[_]] {
   def setFolder(item: Ident, folder: Option[Ident], collective: Ident): F[UpdateResult]
 
   def setFolderMultiple(
-      items: NonEmptyList[Ident],
+      items: Nel[Ident],
       folder: Option[Ident],
       collective: Ident
   ): F[UpdateResult]
 
   def setCorrOrg(
-      items: NonEmptyList[Ident],
+      items: Nel[Ident],
       org: Option[Ident],
       collective: Ident
   ): F[UpdateResult]
@@ -83,7 +97,7 @@ trait OItem[F[_]] {
   def addCorrOrg(item: Ident, org: OOrganization.OrgAndContacts): F[AddResult]
 
   def setCorrPerson(
-      items: NonEmptyList[Ident],
+      items: Nel[Ident],
       person: Option[Ident],
       collective: Ident
   ): F[UpdateResult]
@@ -91,7 +105,7 @@ trait OItem[F[_]] {
   def addCorrPerson(item: Ident, person: OOrganization.PersonAndContacts): F[AddResult]
 
   def setConcPerson(
-      items: NonEmptyList[Ident],
+      items: Nel[Ident],
       person: Option[Ident],
       collective: Ident
   ): F[UpdateResult]
@@ -99,7 +113,7 @@ trait OItem[F[_]] {
   def addConcPerson(item: Ident, person: OOrganization.PersonAndContacts): F[AddResult]
 
   def setConcEquip(
-      items: NonEmptyList[Ident],
+      items: Nel[Ident],
       equip: Option[Ident],
       collective: Ident
   ): F[UpdateResult]
@@ -111,30 +125,30 @@ trait OItem[F[_]] {
   def setName(item: Ident, name: String, collective: Ident): F[UpdateResult]
 
   def setNameMultiple(
-      items: NonEmptyList[Ident],
+      items: Nel[Ident],
       name: String,
       collective: Ident
   ): F[UpdateResult]
 
   def setState(item: Ident, state: ItemState, collective: Ident): F[AddResult] =
-    setStates(NonEmptyList.of(item), state, collective)
+    setStates(Nel.of(item), state, collective)
 
   def setStates(
-      item: NonEmptyList[Ident],
+      item: Nel[Ident],
       state: ItemState,
       collective: Ident
   ): F[AddResult]
 
-  def restore(items: NonEmptyList[Ident], collective: Ident): F[UpdateResult]
+  def restore(items: Nel[Ident], collective: Ident): F[UpdateResult]
 
   def setItemDate(
-      item: NonEmptyList[Ident],
+      item: Nel[Ident],
       date: Option[Timestamp],
       collective: Ident
   ): F[UpdateResult]
 
   def setItemDueDate(
-      item: NonEmptyList[Ident],
+      item: Nel[Ident],
       date: Option[Timestamp],
       collective: Ident
   ): F[UpdateResult]
@@ -143,14 +157,14 @@ trait OItem[F[_]] {
 
   def deleteItem(itemId: Ident, collective: Ident): F[Int]
 
-  def deleteItemMultiple(items: NonEmptyList[Ident], collective: Ident): F[Int]
+  def deleteItemMultiple(items: Nel[Ident], collective: Ident): F[Int]
 
   def deleteAttachment(id: Ident, collective: Ident): F[Int]
 
-  def setDeletedState(items: NonEmptyList[Ident], collective: Ident): F[Int]
+  def setDeletedState(items: Nel[Ident], collective: Ident): F[Int]
 
   def deleteAttachmentMultiple(
-      attachments: NonEmptyList[Ident],
+      attachments: Nel[Ident],
       collective: Ident
   ): F[Int]
 
@@ -174,7 +188,7 @@ trait OItem[F[_]] {
   ): F[UpdateResult]
 
   def reprocessAll(
-      items: NonEmptyList[Ident],
+      items: Nel[Ident],
       account: AccountId,
       notifyJoex: Boolean
   ): F[UpdateResult]
@@ -204,13 +218,12 @@ trait OItem[F[_]] {
   /** Merges a list of items into one item. The remaining items are deleted. */
   def merge(
       logger: Logger[F],
-      items: NonEmptyList[Ident],
+      items: Nel[Ident],
       collective: Ident
   ): F[UpdateResult]
 }
 
 object OItem {
-
   def apply[F[_]: Async](
       store: Store[F],
       fts: FtsClient[F],
@@ -227,7 +240,7 @@ object OItem {
 
         def merge(
             logger: Logger[F],
-            items: NonEmptyList[Ident],
+            items: Nel[Ident],
             collective: Ident
         ): F[UpdateResult] =
           Merge(logger, store, this, createIndex).merge(items, collective).attempt.map {
@@ -250,52 +263,62 @@ object OItem {
             item: Ident,
             tags: List[String],
             collective: Ident
-        ): F[UpdateResult] =
+        ): F[AttachedEvent[UpdateResult]] =
-          linkTagsMultipleItems(NonEmptyList.of(item), tags, collective)
+          linkTagsMultipleItems(Nel.of(item), tags, collective)
 
         def linkTagsMultipleItems(
-            items: NonEmptyList[Ident],
+            items: Nel[Ident],
             tags: List[String],
             collective: Ident
-        ): F[UpdateResult] =
+        ): F[AttachedEvent[UpdateResult]] =
           tags.distinct match {
-            case Nil => UpdateResult.success.pure[F]
+            case Nil => AttachedEvent.only(UpdateResult.success).pure[F]
             case ws =>
-              store.transact {
+              store
+                .transact {
                   (for {
                     itemIds <- OptionT
                       .liftF(RItem.filterItems(items, collective))
-                    .filter(_.nonEmpty)
+                      .subflatMap(l => Nel.fromFoldable(l))
                     given <- OptionT.liftF(RTag.findAllByNameOrId(ws, collective))
-                  _ <- OptionT.liftF(
+                    added <- OptionT.liftF(
                       itemIds.traverse(item =>
                         RTagItem.appendTags(item, given.map(_.tagId).toList)
                       )
                     )
-                } yield UpdateResult.success).getOrElse(UpdateResult.notFound)
+                    ev = Event.TagsChanged.partial(
+                      itemIds,
+                      added.toList.flatten.map(_.id).toList,
+                      Nil
+                    )
+                  } yield AttachedEvent(UpdateResult.success)(ev))
+                    .getOrElse(AttachedEvent.only(UpdateResult.notFound))
                 }
           }
 
         def removeTagsMultipleItems(
-            items: NonEmptyList[Ident],
+            items: Nel[Ident],
             tags: List[String],
             collective: Ident
-        ): F[UpdateResult] =
+        ): F[AttachedEvent[UpdateResult]] =
           tags.distinct match {
-            case Nil => UpdateResult.success.pure[F]
+            case Nil => AttachedEvent.only(UpdateResult.success).pure[F]
             case ws =>
               store.transact {
                 (for {
                   itemIds <- OptionT
                     .liftF(RItem.filterItems(items, collective))
-                    .filter(_.nonEmpty)
+                    .subflatMap(l => Nel.fromFoldable(l))
                   given <- OptionT.liftF(RTag.findAllByNameOrId(ws, collective))
                   _ <- OptionT.liftF(
                     itemIds.traverse(item =>
                       RTagItem.removeAllTags(item, given.map(_.tagId).toList)
                     )
                   )
-                } yield UpdateResult.success).getOrElse(UpdateResult.notFound)
+                  mkEvent = Event.TagsChanged
+                    .partial(itemIds, Nil, given.map(_.tagId.id).toList)
+                } yield AttachedEvent(UpdateResult.success)(mkEvent))
+                  .getOrElse(AttachedEvent.only(UpdateResult.notFound))
               }
           }
 
@@ -303,9 +326,9 @@ object OItem {
             item: Ident,
             tags: List[String],
             collective: Ident
-        ): F[UpdateResult] =
+        ): F[AttachedEvent[UpdateResult]] =
           tags.distinct match {
-            case Nil => UpdateResult.success.pure[F]
+            case Nil => AttachedEvent.only(UpdateResult.success).pure[F]
             case kws =>
               val db =
                 (for {
@@ -316,7 +339,14 @@ object OItem {
                   toadd = given.map(_.tagId).diff(exist.map(_.tagId))
                   _ <- OptionT.liftF(RTagItem.setAllTags(item, toadd))
                   _ <- OptionT.liftF(RTagItem.removeAllTags(item, remove.toSeq))
-                } yield UpdateResult.success).getOrElse(UpdateResult.notFound)
+                  mkEvent = Event.TagsChanged.partial(
+                    Nel.of(item),
+                    toadd.map(_.id).toList,
+                    remove.map(_.id).toList
+                  )
+
+                } yield AttachedEvent(UpdateResult.success)(mkEvent))
+                  .getOrElse(AttachedEvent.only(UpdateResult.notFound))
 
               store.transact(db)
           }
@@ -325,41 +355,69 @@ object OItem {
             item: Ident,
             tagIds: List[String],
             collective: Ident
-        ): F[UpdateResult] =
+        ): F[AttachedEvent[UpdateResult]] =
-          setTagsMultipleItems(NonEmptyList.of(item), tagIds, collective)
+          setTagsMultipleItems(Nel.of(item), tagIds, collective)
 
         def setTagsMultipleItems(
-            items: NonEmptyList[Ident],
+            items: Nel[Ident],
             tags: List[String],
             collective: Ident
-        ): F[UpdateResult] =
+        ): F[AttachedEvent[UpdateResult]] = {
-          UpdateResult.fromUpdate(store.transact(for {
+          val dbTask =
+            for {
               k <- RTagItem.deleteItemTags(items, collective)
-            rtags <- RTag.findAllByNameOrId(tags, collective)
+              given <- RTag.findAllByNameOrId(tags, collective)
-            res <- items.traverse(i => RTagItem.setAllTags(i, rtags.map(_.tagId)))
+              res <- items.traverse(i => RTagItem.setAllTags(i, given.map(_.tagId)))
               n = res.fold
-          } yield k + n))
+              mkEvent = Event.TagsChanged.partial(
+                items,
+                given.map(_.tagId.id).toList,
+                Nil
+              )
+            } yield AttachedEvent(k + n)(mkEvent)
 
-        def addNewTag(item: Ident, tag: RTag): F[AddResult] =
+          for {
+            data <- store.transact(dbTask)
+          } yield data.map(UpdateResult.fromUpdateRows)
+        }
+
+        def addNewTag(
+            collective: Ident,
+            item: Ident,
+            tag: RTag
+        ): F[AttachedEvent[AddResult]] =
           (for {
             _ <- OptionT(store.transact(RItem.getCollective(item)))
               .filter(_ == tag.collective)
             addres <- OptionT.liftF(otag.add(tag))
-            _ <- addres match {
+            res <- addres match {
               case AddResult.Success =>
                 OptionT.liftF(
-                  store.transact(RTagItem.setAllTags(item, List(tag.tagId)))
+                  store
+                    .transact(RTagItem.setAllTags(item, List(tag.tagId)))
+                    .map { _ =>
+                      AttachedEvent(())(
+                        Event.TagsChanged.partial(
+                          Nel.of(item),
+                          List(tag.tagId.id),
+                          Nil
+                        )
                       )
-              case AddResult.EntityExists(_) =>
-                OptionT.pure[F](0)
-              case AddResult.Failure(_) =>
-                OptionT.pure[F](0)
                     }
-          } yield addres)
+                )
-            .getOrElse(AddResult.Failure(new Exception("Collective mismatch")))
+
+              case AddResult.EntityExists(_) =>
+                OptionT.pure[F](AttachedEvent.only(()))
+              case AddResult.Failure(_) =>
+                OptionT.pure[F](AttachedEvent.only(()))
+            }
+          } yield res.map(_ => addres))
+            .getOrElse(
+              AttachedEvent.only(AddResult.Failure(new Exception("Collective mismatch")))
+            )
 
         def setDirection(
-            items: NonEmptyList[Ident],
+            items: Nel[Ident],
             direction: Direction,
             collective: Ident
         ): F[UpdateResult] =
@@ -383,7 +441,7 @@ object OItem {
             )
 
         def setFolderMultiple(
-            items: NonEmptyList[Ident],
+            items: Nel[Ident],
             folder: Option[Ident],
             collective: Ident
         ): F[UpdateResult] =
@@ -404,7 +462,7 @@ object OItem {
           } yield res
 
         def setCorrOrg(
-            items: NonEmptyList[Ident],
+            items: Nel[Ident],
             org: Option[Ident],
             collective: Ident
         ): F[UpdateResult] =
@@ -423,7 +481,7 @@ object OItem {
                 OptionT.liftF(
                   store.transact(
                     RItem.updateCorrOrg(
-                      NonEmptyList.of(item),
+                      Nel.of(item),
                       org.org.cid,
                       Some(org.org.oid)
                     )
@@ -438,7 +496,7 @@ object OItem {
             .getOrElse(AddResult.Failure(new Exception("Collective mismatch")))
 
         def setCorrPerson(
-            items: NonEmptyList[Ident],
+            items: Nel[Ident],
             person: Option[Ident],
             collective: Ident
         ): F[UpdateResult] =
@@ -461,7 +519,7 @@ object OItem {
                   store.transact(
                     RItem
                       .updateCorrPerson(
-                        NonEmptyList.of(item),
+                        Nel.of(item),
                         person.person.cid,
                         Some(person.person.pid)
                       )
@@ -476,7 +534,7 @@ object OItem {
             .getOrElse(AddResult.Failure(new Exception("Collective mismatch")))
 
         def setConcPerson(
-            items: NonEmptyList[Ident],
+            items: Nel[Ident],
             person: Option[Ident],
             collective: Ident
         ): F[UpdateResult] =
@@ -499,7 +557,7 @@ object OItem {
                   store.transact(
                     RItem
                       .updateConcPerson(
-                        NonEmptyList.of(item),
+                        Nel.of(item),
                         person.person.cid,
                         Some(person.person.pid)
                       )
@@ -514,7 +572,7 @@ object OItem {
             .getOrElse(AddResult.Failure(new Exception("Collective mismatch")))
 
         def setConcEquip(
-            items: NonEmptyList[Ident],
+            items: Nel[Ident],
             equip: Option[Ident],
             collective: Ident
         ): F[UpdateResult] =
@@ -533,7 +591,7 @@ object OItem {
                 OptionT.liftF(
                   store.transact(
                     RItem
-                      .updateConcEquip(NonEmptyList.of(item), equip.cid, Some(equip.eid))
+                      .updateConcEquip(Nel.of(item), equip.cid, Some(equip.eid))
                   )
                 )
               case AddResult.EntityExists(_) =>
@@ -569,7 +627,7 @@ object OItem {
             )
 
         def setNameMultiple(
-            items: NonEmptyList[Ident],
+            items: Nel[Ident],
             name: String,
             collective: Ident
         ): F[UpdateResult] =
@@ -590,7 +648,7 @@ object OItem {
           } yield res
 
         def setStates(
-            items: NonEmptyList[Ident],
+            items: Nel[Ident],
             state: ItemState,
             collective: Ident
         ): F[AddResult] =
@@ -600,7 +658,7 @@ object OItem {
             .map(AddResult.fromUpdate)
 
         def restore(
-            items: NonEmptyList[Ident],
+            items: Nel[Ident],
             collective: Ident
         ): F[UpdateResult] =
           UpdateResult.fromUpdate(for {
@@ -612,7 +670,7 @@ object OItem {
           } yield n)
 
         def setItemDate(
-            items: NonEmptyList[Ident],
+            items: Nel[Ident],
             date: Option[Timestamp],
             collective: Ident
         ): F[UpdateResult] =
@@ -622,7 +680,7 @@ object OItem {
           )
 
         def setItemDueDate(
-            items: NonEmptyList[Ident],
+            items: Nel[Ident],
             date: Option[Timestamp],
             collective: Ident
         ): F[UpdateResult] =
@@ -636,14 +694,14 @@ object OItem {
             .delete(store)(itemId, collective)
             .flatTap(_ => fts.removeItem(logger, itemId))
 
-        def deleteItemMultiple(items: NonEmptyList[Ident], collective: Ident): F[Int] =
+        def deleteItemMultiple(items: Nel[Ident], collective: Ident): F[Int] =
           for {
             itemIds <- store.transact(RItem.filterItems(items, collective))
             results <- itemIds.traverse(item => deleteItem(item, collective))
             n = results.sum
           } yield n
 
-        def setDeletedState(items: NonEmptyList[Ident], collective: Ident): F[Int] =
+        def setDeletedState(items: Nel[Ident], collective: Ident): F[Int] =
           for {
             n <- store.transact(RItem.setState(items, collective, ItemState.Deleted))
             _ <- items.traverse(id => fts.removeItem(logger, id))
@@ -658,7 +716,7 @@ object OItem {
             .flatTap(_ => fts.removeAttachment(logger, id))
 
         def deleteAttachmentMultiple(
-            attachments: NonEmptyList[Ident],
+            attachments: Nel[Ident],
             collective: Ident
         ): F[Int] =
           for {
@@ -710,7 +768,7 @@ object OItem {
           } yield UpdateResult.success).getOrElse(UpdateResult.notFound)
 
         def reprocessAll(
-            items: NonEmptyList[Ident],
+            items: Nel[Ident],
             account: AccountId,
             notifyJoex: Boolean
         ): F[UpdateResult] =

modules/backend/src/main/scala/docspell/backend/ops/ONotification.scala

@@ -0,0 +1,347 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.backend.ops
+
+import java.io.PrintWriter
+import java.io.StringWriter
+
+import cats.data.OptionT
+import cats.data.{NonEmptyList => Nel}
+import cats.effect._
+import cats.implicits._
+
+import docspell.backend.ops.ONotification.Hook
+import docspell.common._
+import docspell.jsonminiq.JsonMiniQuery
+import docspell.notification.api._
+import docspell.store.AddResult
+import docspell.store.Store
+import docspell.store.UpdateResult
+import docspell.store.queries.QNotification
+import docspell.store.records._
+
+trait ONotification[F[_]] {
+
+  def sendMessage(
+      logger: Logger[F],
+      data: EventContext,
+      channels: Seq[NotificationChannel]
+  ): F[Unit]
+
+  def offerEvents(ev: Iterable[Event]): F[Unit]
+
+  def mkNotificationChannel(channel: Channel): F[Vector[NotificationChannel]]
+
+  def findNotificationChannel(ref: ChannelRef): F[Vector[NotificationChannel]]
+
+  def listChannels(account: AccountId): F[Vector[Channel]]
+
+  def deleteChannel(id: Ident, account: AccountId): F[UpdateResult]
+
+  def createChannel(channel: Channel, account: AccountId): F[AddResult]
+
+  def updateChannel(channel: Channel, account: AccountId): F[UpdateResult]
+
+  def listHooks(account: AccountId): F[Vector[Hook]]
+
+  def deleteHook(id: Ident, account: AccountId): F[UpdateResult]
+
+  def createHook(hook: Hook, account: AccountId): F[AddResult]
+
+  def updateHook(hook: Hook, account: AccountId): F[UpdateResult]
+
+  def sampleEvent(
+      evt: EventType,
+      account: AccountId,
+      baseUrl: Option[LenientUri]
+  ): F[EventContext]
+
+  def sendSampleEvent(
+      evt: EventType,
+      channel: Channel,
+      account: AccountId,
+      baseUrl: Option[LenientUri]
+  ): F[ONotification.SendTestResult]
+}
+
+object ONotification {
+  private[this] val logger = org.log4s.getLogger
+
+  def apply[F[_]: Async](
+      store: Store[F],
+      notMod: NotificationModule[F]
+  ): Resource[F, ONotification[F]] =
+    Resource.pure[F, ONotification[F]](new ONotification[F] {
+      val log = Logger.log4s[F](logger)
+
+      def withUserId[A](
+          account: AccountId
+      )(f: Ident => F[UpdateResult]): F[UpdateResult] =
+        OptionT(store.transact(RUser.findIdByAccount(account)))
+          .semiflatMap(f)
+          .getOrElse(UpdateResult.notFound)
+
+      def offerEvents(ev: Iterable[Event]): F[Unit] =
+        ev.toList.traverse(notMod.offer(_)).as(())
+
+      def sendMessage(
+          logger: Logger[F],
+          data: EventContext,
+          channels: Seq[NotificationChannel]
+      ): F[Unit] =
+        notMod.send(logger, data, channels)
+
+      def sampleEvent(
+          evt: EventType,
+          account: AccountId,
+          baseUrl: Option[LenientUri]
+      ): F[EventContext] =
+        Event
+          .sample[F](evt, account, baseUrl)
+          .flatMap(notMod.sampleEvent.run)
+
+      def sendSampleEvent(
+          evt: EventType,
+          channel: Channel,
+          account: AccountId,
+          baseUrl: Option[LenientUri]
+      ): F[SendTestResult] =
+        (for {
+          ev <- sampleEvent(evt, account, baseUrl)
+          logbuf <- Logger.buffer()
+          ch <- mkNotificationChannel(channel)
+          _ <- notMod.send(logbuf._2.andThen(log), ev, ch)
+          logs <- logbuf._1.get
+          res = SendTestResult(true, logs)
+        } yield res).attempt
+          .map {
+            case Right(res) => res
+            case Left(ex) =>
+              val ps = new StringWriter()
+              ex.printStackTrace(new PrintWriter(ps))
+              SendTestResult(false, Vector(s"${ex.getMessage}\n$ps"))
+          }
+
+      def listChannels(account: AccountId): F[Vector[Channel]] =
+        store
+          .transact(RNotificationChannel.getByAccount(account))
+          .map(_.map(ChannelConv.makeChannel))
+
+      def deleteChannel(id: Ident, account: AccountId): F[UpdateResult] =
+        UpdateResult
+          .fromUpdate(
+            store.transact(RNotificationChannel.deleteByAccount(id, account))
+          )
+          .flatTap(_ => log.info(s"Deleted channel ${id.id} for ${account.asString}"))
+
+      def createChannel(channel: Channel, account: AccountId): F[AddResult] =
+        (for {
+          newId <- OptionT.liftF(Ident.randomId[F])
+          userId <- OptionT(store.transact(RUser.findIdByAccount(account)))
+          r <- ChannelConv.makeRecord[F](store, Right(channel), newId, userId)
+          _ <- OptionT.liftF(store.transact(RNotificationChannel.insert(r)))
+          _ <- OptionT.liftF(log.debug(s"Created channel $r for $account"))
+        } yield AddResult.Success)
+          .getOrElse(AddResult.failure(new Exception("User not found!")))
+
+      def updateChannel(channel: Channel, account: AccountId): F[UpdateResult] =
+        (for {
+          userId <- OptionT(store.transact(RUser.findIdByAccount(account)))
+          r <- ChannelConv.makeRecord[F](store, Right(channel), channel.id, userId)
+          n <- OptionT.liftF(store.transact(RNotificationChannel.update(r)))
+        } yield UpdateResult.fromUpdateRows(n)).getOrElse(UpdateResult.notFound)
+
+      def listHooks(account: AccountId): F[Vector[Hook]] =
+        store.transact(for {
+          list <- RNotificationHook.findAllByAccount(account)
+          res <- list.traverse((Hook.fromRecord _).tupled)
+        } yield res)
+
+      def deleteHook(id: Ident, account: AccountId): F[UpdateResult] =
+        UpdateResult
+          .fromUpdate(store.transact(RNotificationHook.deleteByAccount(id, account)))
+
+      def createHook(hook: Hook, account: AccountId): F[AddResult] =
+        (for {
+          _ <- OptionT.liftF(log.debug(s"Creating new notification hook: $hook"))
+          channelId <- OptionT.liftF(Ident.randomId[F])
+          userId <- OptionT(store.transact(RUser.findIdByAccount(account)))
+          r <- ChannelConv.makeRecord[F](store, hook.channel, channelId, userId)
+          _ <- OptionT.liftF(
+            if (channelId == r.id) store.transact(RNotificationChannel.insert(r))
+            else ().pure[F]
+          )
+          _ <- OptionT.liftF(log.debug(s"Created channel $r for $account"))
+          hr <- OptionT.liftF(Hook.makeRecord(r, userId, hook))
+          _ <- OptionT.liftF(store.transact(RNotificationHook.insert(hr)))
+          _ <- OptionT.liftF(
+            store.transact(RNotificationHookEvent.insertAll(hr.id, hook.events))
+          )
+        } yield AddResult.Success)
+          .getOrElse(AddResult.failure(new Exception("User or channel not found!")))
+
+      def updateHook(hook: Hook, account: AccountId): F[UpdateResult] = {
+        def withHook(f: RNotificationHook => F[UpdateResult]): F[UpdateResult] =
+          withUserId(account)(userId =>
+            OptionT(store.transact(RNotificationHook.getById(hook.id, userId)))
+              .semiflatMap(f)
+              .getOrElse(UpdateResult.notFound)
+          )
+
+        def withChannel(
+            r: RNotificationHook
+        )(f: RNotificationChannel => F[UpdateResult]): F[UpdateResult] =
+          ChannelConv
+            .makeRecord(store, hook.channel, r.channelId, r.uid)
+            .semiflatMap(f)
+            .getOrElse(UpdateResult.notFound)
+
+        def doUpdate(r: RNotificationHook): F[UpdateResult] =
+          withChannel(r) { ch =>
+            UpdateResult.fromUpdate(store.transact(for {
+              nc <- RNotificationChannel.update(ch)
+              ne <- RNotificationHookEvent.updateAll(
+                r.id,
+                if (hook.allEvents) Nil else hook.events
+              )
+              nr <- RNotificationHook.update(
+                r.copy(
+                  enabled = hook.enabled,
+                  allEvents = hook.allEvents,
+                  eventFilter = hook.eventFilter
+                )
+              )
+            } yield nc + ne + nr))
+          }
+
+        withHook(doUpdate)
+      }
+
+      def mkNotificationChannel(channel: Channel): F[Vector[NotificationChannel]] =
+        (for {
+          rec <- ChannelConv
+            .makeRecord(store, Right(channel), channel.id, Ident.unsafe(""))
+          ch <- OptionT.liftF(store.transact(QNotification.readChannel(rec)))
+        } yield ch).getOrElse(Vector.empty)
+
+      def findNotificationChannel(ref: ChannelRef): F[Vector[NotificationChannel]] =
+        (for {
+          rec <- OptionT(store.transact(RNotificationChannel.getByRef(ref)))
+          ch <- OptionT.liftF(store.transact(QNotification.readChannel(rec)))
+        } yield ch).getOrElse(Vector.empty)
+    })
+
+  object ChannelConv {
+
+    private[ops] def makeChannel(r: RNotificationChannel): Channel =
+      r.fold(
+        mail =>
+          Channel.Mail(mail.id, mail.connection, Nel.fromListUnsafe(mail.recipients)),
+        gotify => Channel.Gotify(r.id, gotify.url, gotify.appKey),
+        matrix =>
+          Channel.Matrix(r.id, matrix.homeServer, matrix.roomId, matrix.accessToken),
+        http => Channel.Http(r.id, http.url)
+      )
+
+    private[ops] def makeRecord[F[_]: Sync](
+        store: Store[F],
+        channelIn: Either[ChannelRef, Channel],
+        id: Ident,
+        userId: Ident
+    ): OptionT[F, RNotificationChannel] =
+      channelIn match {
+        case Left(ref) =>
+          OptionT(store.transact(RNotificationChannel.getByRef(ref)))
+
+        case Right(channel) =>
+          for {
+            time <- OptionT.liftF(Timestamp.current[F])
+            r <-
+              channel match {
+                case Channel.Mail(_, conn, recipients) =>
+                  for {
+                    mailConn <- OptionT(
+                      store.transact(RUserEmail.getByUser(userId, conn))
+                    )
+                    rec = RNotificationChannelMail(
+                      id,
+                      userId,
+                      mailConn.id,
+                      recipients.toList,
+                      time
+                    ).vary
+                  } yield rec
+                case Channel.Gotify(_, url, appKey) =>
+                  OptionT.pure[F](
+                    RNotificationChannelGotify(id, userId, url, appKey, time).vary
+                  )
+                case Channel.Matrix(_, homeServer, roomId, accessToken) =>
+                  OptionT.pure[F](
+                    RNotificationChannelMatrix(
+                      id,
+                      userId,
+                      homeServer,
+                      roomId,
+                      accessToken,
+                      "m.text",
+                      time
+                    ).vary
+                  )
+                case Channel.Http(_, url) =>
+                  OptionT.pure[F](RNotificationChannelHttp(id, userId, url, time).vary)
+              }
+          } yield r
+      }
+  }
+
+  final case class Hook(
+      id: Ident,
+      enabled: Boolean,
+      channel: Either[ChannelRef, Channel],
+      allEvents: Boolean,
+      eventFilter: Option[JsonMiniQuery],
+      events: List[EventType]
+  )
+
+  object Hook {
+    import doobie._
+
+    private[ops] def fromRecord(
+        r: RNotificationHook,
+        events: List[EventType]
+    ): ConnectionIO[Hook] =
+      RNotificationChannel
+        .getByHook(r)
+        .map(_.head)
+        .map(ChannelConv.makeChannel)
+        .map(ch => Hook(r.id, r.enabled, Right(ch), r.allEvents, r.eventFilter, events))
+
+    private[ops] def makeRecord[F[_]: Sync](
+        ch: RNotificationChannel,
+        userId: Ident,
+        hook: Hook
+    ): F[RNotificationHook] =
+      for {
+        id <- Ident.randomId[F]
+        time <- Timestamp.current[F]
+        h = RNotificationHook(
+          id,
+          userId,
+          hook.enabled,
+          ch.fold(_.id.some, _ => None, _ => None, _ => None),
+          ch.fold(_ => None, _.id.some, _ => None, _ => None),
+          ch.fold(_ => None, _ => None, _.id.some, _ => None),
+          ch.fold(_ => None, _ => None, _ => None, _.id.some),
+          hook.allEvents,
+          hook.eventFilter,
+          time
+        )
+      } yield h
+  }
+
+  final case class SendTestResult(success: Boolean, logMessages: Vector[String])
+}

modules/backend/src/main/scala/docspell/backend/ops/OUserTask.scala

@@ -11,7 +11,10 @@ import cats.effect._
 import cats.implicits._
 import fs2.Stream
 
+import docspell.backend.MailAddressCodec._
 import docspell.common._
+import docspell.notification.api.PeriodicDueItemsArgs
+import docspell.notification.api.PeriodicQueryArgs
 import docspell.store.queue.JobQueue
 import docspell.store.usertask._
 
@@ -19,6 +22,22 @@ import io.circe.Encoder
 
 trait OUserTask[F[_]] {
 
+  /** Return the settings for all periodic-query tasks of the given user */
+  def getPeriodicQuery(scope: UserTaskScope): Stream[F, UserTask[PeriodicQueryArgs]]
+
+  /** Find a periodic-query task by the given id. */
+  def findPeriodicQuery(
+      id: Ident,
+      scope: UserTaskScope
+  ): OptionT[F, UserTask[PeriodicQueryArgs]]
+
+  /** Updates the periodic-query task of the given user. */
+  def submitPeriodicQuery(
+      scope: UserTaskScope,
+      subject: Option[String],
+      task: UserTask[PeriodicQueryArgs]
+  ): F[Unit]
+
   /** Return the settings for all scan-mailbox tasks of the current user. */
   def getScanMailbox(scope: UserTaskScope): Stream[F, UserTask[ScanMailboxArgs]]
 
@@ -36,19 +55,19 @@ trait OUserTask[F[_]] {
   ): F[Unit]
 
   /** Return the settings for all the notify-due-items task of the current user. */
-  def getNotifyDueItems(scope: UserTaskScope): Stream[F, UserTask[NotifyDueItemsArgs]]
+  def getNotifyDueItems(scope: UserTaskScope): Stream[F, UserTask[PeriodicDueItemsArgs]]
 
   /** Find a notify-due-items task by the given id. */
   def findNotifyDueItems(
       id: Ident,
       scope: UserTaskScope
-  ): OptionT[F, UserTask[NotifyDueItemsArgs]]
+  ): OptionT[F, UserTask[PeriodicDueItemsArgs]]
 
   /** Updates the notify-due-items tasks and notifies the joex nodes. */
   def submitNotifyDueItems(
       scope: UserTaskScope,
       subject: Option[String],
-      task: UserTask[NotifyDueItemsArgs]
+      task: UserTask[PeriodicDueItemsArgs]
   ): F[Unit]
 
   /** Removes a user task with the given id. */
@@ -109,23 +128,42 @@ object OUserTask {
 
       def getNotifyDueItems(
           scope: UserTaskScope
-      ): Stream[F, UserTask[NotifyDueItemsArgs]] =
+      ): Stream[F, UserTask[PeriodicDueItemsArgs]] =
         store
-          .getByName[NotifyDueItemsArgs](scope, NotifyDueItemsArgs.taskName)
+          .getByName[PeriodicDueItemsArgs](scope, PeriodicDueItemsArgs.taskName)
 
       def findNotifyDueItems(
           id: Ident,
           scope: UserTaskScope
-      ): OptionT[F, UserTask[NotifyDueItemsArgs]] =
+      ): OptionT[F, UserTask[PeriodicDueItemsArgs]] =
         OptionT(getNotifyDueItems(scope).find(_.id == id).compile.last)
 
       def submitNotifyDueItems(
           scope: UserTaskScope,
           subject: Option[String],
-          task: UserTask[NotifyDueItemsArgs]
+          task: UserTask[PeriodicDueItemsArgs]
       ): F[Unit] =
         for {
-          _ <- store.updateTask[NotifyDueItemsArgs](scope, subject, task)
+          _ <- store.updateTask[PeriodicDueItemsArgs](scope, subject, task)
+          _ <- joex.notifyAllNodes
+        } yield ()
+
+      def getPeriodicQuery(scope: UserTaskScope): Stream[F, UserTask[PeriodicQueryArgs]] =
+        store.getByName[PeriodicQueryArgs](scope, PeriodicQueryArgs.taskName)
+
+      def findPeriodicQuery(
+          id: Ident,
+          scope: UserTaskScope
+      ): OptionT[F, UserTask[PeriodicQueryArgs]] =
+        OptionT(getPeriodicQuery(scope).find(_.id == id).compile.last)
+
+      def submitPeriodicQuery(
+          scope: UserTaskScope,
+          subject: Option[String],
+          task: UserTask[PeriodicQueryArgs]
+      ): F[Unit] =
+        for {
+          _ <- store.updateTask[PeriodicQueryArgs](scope, subject, task)
           _ <- joex.notifyAllNodes
         } yield ()
     })

modules/common/src/main/scala/docspell/common/ItemQueryString.scala

@@ -6,6 +6,8 @@
 
 package docspell.common
 
+import io.circe.{Decoder, Encoder}
+
 final case class ItemQueryString(query: String) {
   def isEmpty: Boolean =
     query.isEmpty
@@ -15,4 +17,9 @@ object ItemQueryString {
 
   def apply(qs: Option[String]): ItemQueryString =
     ItemQueryString(qs.getOrElse(""))
+
+  implicit val jsonEncoder: Encoder[ItemQueryString] =
+    Encoder.encodeString.contramap(_.query)
+  implicit val jsonDecoder: Decoder[ItemQueryString] =
+    Decoder.decodeString.map(ItemQueryString.apply)
 }

modules/common/src/main/scala/docspell/common/LenientUri.scala

@@ -103,6 +103,8 @@ case class LenientUri(
     val fragPart = fragment.map(f => s"#$f").getOrElse("")
     s"$schemePart:$authPart$pathPart$queryPart$fragPart"
   }
+  override def toString(): String =
+    asString
 }
 
 object LenientUri {

modules/common/src/main/scala/docspell/common/Logger.scala

@@ -6,8 +6,11 @@
 
 package docspell.common
 
+import java.io.{PrintWriter, StringWriter}
+
 import cats.Applicative
-import cats.effect.Sync
+import cats.effect.{Ref, Sync}
+import cats.implicits._
 import fs2.Stream
 
 import docspell.common.syntax.all._
@@ -42,6 +45,28 @@ trait Logger[F[_]] { self =>
     def error(ex: Throwable)(msg: => String): Stream[F, Unit] =
       Stream.eval(self.error(ex)(msg))
   }
+  def andThen(other: Logger[F])(implicit F: Sync[F]): Logger[F] = {
+    val self = this
+    new Logger[F] {
+      def trace(msg: => String) =
+        self.trace(msg) >> other.trace(msg)
+
+      override def debug(msg: => String) =
+        self.debug(msg) >> other.debug(msg)
+
+      override def info(msg: => String) =
+        self.info(msg) >> other.info(msg)
+
+      override def warn(msg: => String) =
+        self.warn(msg) >> other.warn(msg)
+
+      override def error(ex: Throwable)(msg: => String) =
+        self.error(ex)(msg) >> other.error(ex)(msg)
+
+      override def error(msg: => String) =
+        self.error(msg) >> other.error(msg)
+    }
+  }
 }
 
 object Logger {
@@ -88,4 +113,31 @@ object Logger {
         log.ferror(msg)
     }
 
+  def buffer[F[_]: Sync](): F[(Ref[F, Vector[String]], Logger[F])] =
+    for {
+      buffer <- Ref.of[F, Vector[String]](Vector.empty[String])
+      logger = new Logger[F] {
+        def trace(msg: => String) =
+          buffer.update(_.appended(s"TRACE $msg"))
+
+        def debug(msg: => String) =
+          buffer.update(_.appended(s"DEBUG $msg"))
+
+        def info(msg: => String) =
+          buffer.update(_.appended(s"INFO $msg"))
+
+        def warn(msg: => String) =
+          buffer.update(_.appended(s"WARN $msg"))
+
+        def error(ex: Throwable)(msg: => String) = {
+          val ps = new StringWriter()
+          ex.printStackTrace(new PrintWriter(ps))
+          buffer.update(_.appended(s"ERROR $msg:\n$ps"))
+        }
+
+        def error(msg: => String) =
+          buffer.update(_.appended(s"ERROR $msg"))
+      }
+    } yield (buffer, logger)
+
 }

modules/common/src/main/scala/docspell/common/NotifyDueItemsArgs.scala

@@ -27,7 +27,7 @@ case class NotifyDueItemsArgs(
     daysBack: Option[Int],
     tagsInclude: List[Ident],
     tagsExclude: List[Ident]
-) {}
+)
 
 object NotifyDueItemsArgs {
 

modules/joex/src/main/scala/docspell/joex/JoexAppImpl.scala

@@ -11,6 +11,7 @@ import cats.implicits._
 import fs2.concurrent.SignallingRef
 
 import docspell.analysis.TextAnalyser
+import docspell.backend.MailAddressCodec
 import docspell.backend.fulltext.CreateIndex
 import docspell.backend.msg.{CancelJob, JobQueuePublish, Topics}
 import docspell.backend.ops._
@@ -32,6 +33,8 @@ import docspell.joex.process.ReProcessItem
 import docspell.joex.scanmailbox._
 import docspell.joex.scheduler._
 import docspell.joex.updatecheck._
+import docspell.notification.api.NotificationModule
+import docspell.notification.impl.NotificationModuleImpl
 import docspell.pubsub.api.{PubSub, PubSubT}
 import docspell.store.Store
 import docspell.store.queue._
@@ -49,16 +52,19 @@ final class JoexAppImpl[F[_]: Async](
     pubSubT: PubSubT[F],
     pstore: PeriodicTaskStore[F],
     termSignal: SignallingRef[F, Boolean],
+    notificationMod: NotificationModule[F],
     val scheduler: Scheduler[F],
     val periodicScheduler: PeriodicScheduler[F]
 ) extends JoexApp[F] {
   def init: F[Unit] = {
     val run = scheduler.start.compile.drain
     val prun = periodicScheduler.start.compile.drain
+    val eventConsume = notificationMod.consumeAllEvents(2).compile.drain
     for {
       _ <- scheduleBackgroundTasks
       _ <- Async[F].start(run)
       _ <- Async[F].start(prun)
+      _ <- Async[F].start(eventConsume)
       _ <- scheduler.periodicAwake
       _ <- periodicScheduler.periodicAwake
       _ <- subscriptions
@@ -115,7 +121,7 @@ final class JoexAppImpl[F[_]: Async](
 
 }
 
-object JoexAppImpl {
+object JoexAppImpl extends MailAddressCodec {
 
   def create[F[_]: Async](
       cfg: Config,
@@ -130,7 +136,12 @@ object JoexAppImpl {
         pubSub,
         Logger.log4s(org.log4s.getLogger(s"joex-${cfg.appId.id}"))
       )
-      queue <- JobQueuePublish(store, pubSubT)
+      javaEmil =
+        JavaMailEmil(Settings.defaultSettings.copy(debug = cfg.mailDebug))
+      notificationMod <- Resource.eval(
+        NotificationModuleImpl[F](store, javaEmil, httpClient, 200)
+      )
+      queue <- JobQueuePublish(store, pubSubT, notificationMod)
       joex <- OJoex(pubSubT)
       upload <- OUpload(store, queue, joex)
       fts <- createFtsClient(cfg)(httpClient)
@@ -140,11 +151,11 @@ object JoexAppImpl {
       analyser <- TextAnalyser.create[F](cfg.textAnalysis.textAnalysisConfig)
       regexNer <- RegexNerFile(cfg.textAnalysis.regexNerFileConfig, store)
       updateCheck <- UpdateCheck.resource(httpClient)
-      javaEmil =
+      notification <- ONotification(store, notificationMod)
-        JavaMailEmil(Settings.defaultSettings.copy(debug = cfg.mailDebug))
       sch <- SchedulerBuilder(cfg.scheduler, store)
         .withQueue(queue)
         .withPubSub(pubSubT)
+        .withEventSink(notificationMod)
         .withTask(
           JobTask.json(
             ProcessItemArgs.taskName,
@@ -263,6 +274,20 @@ object JoexAppImpl {
             UpdateCheckTask.onCancel[F]
           )
         )
+        .withTask(
+          JobTask.json(
+            PeriodicQueryTask.taskName,
+            PeriodicQueryTask[F](notification),
+            PeriodicQueryTask.onCancel[F]
+          )
+        )
+        .withTask(
+          JobTask.json(
+            PeriodicDueItemsTask.taskName,
+            PeriodicDueItemsTask[F](notification),
+            PeriodicDueItemsTask.onCancel[F]
+          )
+        )
         .resource
       psch <- PeriodicScheduler.create(
         cfg.periodicScheduler,
@@ -271,7 +296,17 @@ object JoexAppImpl {
         pstore,
         joex
       )
-      app = new JoexAppImpl(cfg, store, queue, pubSubT, pstore, termSignal, sch, psch)
+      app = new JoexAppImpl(
+        cfg,
+        store,
+        queue,
+        pubSubT,
+        pstore,
+        termSignal,
+        notificationMod,
+        sch,
+        psch
+      )
       appR <- Resource.make(app.init.map(_ => app))(_.initShutdown)
     } yield appR
 

modules/joex/src/main/scala/docspell/joex/notify/PeriodicDueItemsTask.scala

@@ -0,0 +1,106 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.joex.notify
+
+import cats.data.NonEmptyList
+import cats.effect._
+import cats.implicits._
+
+import docspell.backend.ops.ONotification
+import docspell.common._
+import docspell.joex.scheduler.Context
+import docspell.joex.scheduler.Task
+import docspell.notification.api.EventContext
+import docspell.notification.api.NotificationChannel
+import docspell.notification.api.PeriodicDueItemsArgs
+import docspell.query.Date
+import docspell.query.ItemQuery._
+import docspell.query.ItemQueryDsl._
+import docspell.store.qb.Batch
+import docspell.store.queries.ListItem
+import docspell.store.queries.{QItem, Query}
+
+object PeriodicDueItemsTask {
+  val taskName = PeriodicDueItemsArgs.taskName
+
+  type Args = PeriodicDueItemsArgs
+
+  def onCancel[F[_]]: Task[F, Args, Unit] =
+    Task.log(_.warn(s"Cancelling ${taskName.id} task"))
+
+  def apply[F[_]: Sync](notificationOps: ONotification[F]): Task[F, Args, Unit] =
+    Task { ctx =>
+      val limit = 7
+      Timestamp.current[F].flatMap { now =>
+        withItems(ctx, limit, now) { items =>
+          withEventContext(ctx, items, limit, now) { eventCtx =>
+            withChannel(ctx, notificationOps) { channels =>
+              notificationOps.sendMessage(ctx.logger, eventCtx, channels)
+            }
+          }
+        }
+      }
+    }
+
+  def withChannel[F[_]: Sync](ctx: Context[F, Args], ops: ONotification[F])(
+      cont: Vector[NotificationChannel] => F[Unit]
+  ): F[Unit] =
+    TaskOperations.withChannel(ctx.logger, ctx.args.channel, ops)(cont)
+
+  def withItems[F[_]: Sync](ctx: Context[F, Args], limit: Int, now: Timestamp)(
+      cont: Vector[ListItem] => F[Unit]
+  ): F[Unit] = {
+    val rightDate = Date((now + Duration.days(ctx.args.remindDays.toLong)).toMillis)
+    val q =
+      Query
+        .all(ctx.args.account)
+        .withOrder(orderAsc = _.dueDate)
+        .withFix(_.copy(query = Expr.ValidItemStates.some))
+        .withCond(_ =>
+          Query.QueryExpr(
+            Attr.DueDate <= rightDate &&?
+              ctx.args.daysBack.map(back =>
+                Attr.DueDate >= Date((now - Duration.days(back.toLong)).toMillis)
+              ) &&?
+              NonEmptyList
+                .fromList(ctx.args.tagsInclude)
+                .map(ids => Q.tagIdsEq(ids.map(_.id))) &&?
+              NonEmptyList
+                .fromList(ctx.args.tagsExclude)
+                .map(ids => Q.tagIdsIn(ids.map(_.id)).negate)
+          )
+        )
+
+    for {
+      res <-
+        ctx.store
+          .transact(
+            QItem
+              .findItems(q, now.toUtcDate, 0, Batch.limit(limit))
+              .take(limit.toLong)
+          )
+          .compile
+          .toVector
+      _ <- cont(res)
+    } yield ()
+  }
+
+  def withEventContext[F[_]](
+      ctx: Context[F, Args],
+      items: Vector[ListItem],
+      limit: Int,
+      now: Timestamp
+  )(cont: EventContext => F[Unit]): F[Unit] =
+    TaskOperations.withEventContext(
+      ctx.logger,
+      ctx.args.account,
+      ctx.args.baseUrl,
+      items,
+      limit,
+      now
+    )(cont)
+}

modules/joex/src/main/scala/docspell/joex/notify/PeriodicQueryTask.scala

@@ -0,0 +1,84 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.joex.notify
+
+import cats.effect._
+import cats.implicits._
+
+import docspell.backend.ops.ONotification
+import docspell.common._
+import docspell.joex.scheduler.Context
+import docspell.joex.scheduler.Task
+import docspell.notification.api.EventContext
+import docspell.notification.api.NotificationChannel
+import docspell.notification.api.PeriodicQueryArgs
+import docspell.query.ItemQueryParser
+import docspell.store.qb.Batch
+import docspell.store.queries.ListItem
+import docspell.store.queries.{QItem, Query}
+
+object PeriodicQueryTask {
+  val taskName = PeriodicQueryArgs.taskName
+
+  type Args = PeriodicQueryArgs
+
+  def onCancel[F[_]]: Task[F, Args, Unit] =
+    Task.log(_.warn(s"Cancelling ${taskName.id} task"))
+
+  def apply[F[_]: Sync](notificationOps: ONotification[F]): Task[F, Args, Unit] =
+    Task { ctx =>
+      val limit = 7
+      Timestamp.current[F].flatMap { now =>
+        withItems(ctx, limit, now) { items =>
+          withEventContext(ctx, items, limit, now) { eventCtx =>
+            withChannel(ctx, notificationOps) { channels =>
+              notificationOps.sendMessage(ctx.logger, eventCtx, channels)
+            }
+          }
+        }
+      }
+    }
+
+  def withChannel[F[_]: Sync](ctx: Context[F, Args], ops: ONotification[F])(
+      cont: Vector[NotificationChannel] => F[Unit]
+  ): F[Unit] =
+    TaskOperations.withChannel(ctx.logger, ctx.args.channel, ops)(cont)
+
+  def withItems[F[_]: Sync](ctx: Context[F, Args], limit: Int, now: Timestamp)(
+      cont: Vector[ListItem] => F[Unit]
+  ): F[Unit] =
+    ItemQueryParser.parse(ctx.args.query.query) match {
+      case Right(q) =>
+        val query = Query(Query.Fix(ctx.args.account, Some(q.expr), None))
+        val items = ctx.store
+          .transact(QItem.findItems(query, now.toUtcDate, 0, Batch.limit(limit)))
+          .compile
+          .to(Vector)
+
+        items.flatMap(cont)
+      case Left(err) =>
+        ctx.logger.error(
+          s"Item query is invalid, stopping: ${ctx.args.query} - ${err.render}"
+        )
+    }
+
+  def withEventContext[F[_]](
+      ctx: Context[F, Args],
+      items: Vector[ListItem],
+      limit: Int,
+      now: Timestamp
+  )(cont: EventContext => F[Unit]): F[Unit] =
+    TaskOperations.withEventContext(
+      ctx.logger,
+      ctx.args.account,
+      ctx.args.baseUrl,
+      items,
+      limit,
+      now
+    )(cont)
+
+}

modules/joex/src/main/scala/docspell/joex/notify/TaskOperations.scala

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.joex.notify
+
+import cats.data.NonEmptyList
+import cats.effect._
+import cats.implicits._
+
+import docspell.backend.ops.ONotification
+import docspell.common._
+import docspell.notification.api.ChannelOrRef
+import docspell.notification.api.Event
+import docspell.notification.api.EventContext
+import docspell.notification.api.NotificationChannel
+import docspell.notification.impl.context.ItemSelectionCtx
+import docspell.store.queries.ListItem
+
+trait TaskOperations {
+
+  def withChannel[F[_]: Sync](
+      logger: Logger[F],
+      channel: ChannelOrRef,
+      ops: ONotification[F]
+  )(
+      cont: Vector[NotificationChannel] => F[Unit]
+  ): F[Unit] = {
+    val channels = channel match {
+      case Right(ch) => ops.mkNotificationChannel(ch)
+      case Left(ref) => ops.findNotificationChannel(ref)
+    }
+    channels.flatMap { ch =>
+      if (ch.isEmpty)
+        logger.error(s"No channels found for the given data: ${channel}")
+      else cont(ch)
+    }
+  }
+
+  def withEventContext[F[_]](
+      logger: Logger[F],
+      account: AccountId,
+      baseUrl: Option[LenientUri],
+      items: Vector[ListItem],
+      limit: Int,
+      now: Timestamp
+  )(cont: EventContext => F[Unit]): F[Unit] =
+    NonEmptyList.fromFoldable(items) match {
+      case Some(nel) =>
+        val more = items.size >= limit
+        val eventCtx = ItemSelectionCtx(
+          Event.ItemSelection(account, nel.map(_.id), more, baseUrl),
+          ItemSelectionCtx.Data
+            .create(account, items, baseUrl, more, now)
+        )
+        cont(eventCtx)
+      case None =>
+        logger.info(s"The query selected no items. Notification aborted")
+    }
+}
+
+object TaskOperations extends TaskOperations

modules/joex/src/main/scala/docspell/joex/scheduler/SchedulerBuilder.scala

@@ -11,6 +11,7 @@ import cats.effect.std.Semaphore
 import cats.implicits._
 import fs2.concurrent.SignallingRef
 
+import docspell.notification.api.EventSink
 import docspell.pubsub.api.PubSubT
 import docspell.store.Store
 import docspell.store.queue.JobQueue
@@ -21,7 +22,8 @@ case class SchedulerBuilder[F[_]: Async](
     store: Store[F],
     queue: Resource[F, JobQueue[F]],
     logSink: LogSink[F],
-    pubSub: PubSubT[F]
+    pubSub: PubSubT[F],
+    eventSink: EventSink[F]
 ) {
 
   def withConfig(cfg: SchedulerConfig): SchedulerBuilder[F] =
@@ -45,6 +47,9 @@ case class SchedulerBuilder[F[_]: Async](
   def withPubSub(pubSubT: PubSubT[F]): SchedulerBuilder[F] =
     copy(pubSub = pubSubT)
 
+  def withEventSink(sink: EventSink[F]): SchedulerBuilder[F] =
+    copy(eventSink = sink)
+
   def serve: Resource[F, Scheduler[F]] =
     resource.evalMap(sch => Async[F].start(sch.start.compile.drain).map(_ => sch))
 
@@ -58,6 +63,7 @@ case class SchedulerBuilder[F[_]: Async](
       config,
       jq,
       pubSub,
+      eventSink,
       tasks,
       store,
       logSink,
@@ -83,7 +89,8 @@ object SchedulerBuilder {
       store,
       JobQueue(store),
       LogSink.db[F](store),
-      PubSubT.noop[F]
+      PubSubT.noop[F],
+      EventSink.silent[F]
     )
 
 }

modules/joex/src/main/scala/docspell/joex/scheduler/SchedulerImpl.scala

@@ -17,6 +17,8 @@ import docspell.backend.msg.JobDone
 import docspell.common._
 import docspell.common.syntax.all._
 import docspell.joex.scheduler.SchedulerImpl._
+import docspell.notification.api.Event
+import docspell.notification.api.EventSink
 import docspell.pubsub.api.PubSubT
 import docspell.store.Store
 import docspell.store.queries.QJob
@@ -29,6 +31,7 @@ final class SchedulerImpl[F[_]: Async](
     val config: SchedulerConfig,
     queue: JobQueue[F],
     pubSub: PubSubT[F],
+    eventSink: EventSink[F],
     tasks: JobTaskRegistry[F],
     store: Store[F],
     logSink: LogSink[F],
@@ -206,6 +209,17 @@ final class SchedulerImpl[F[_]: Async](
         JobDone.topic,
         JobDone(job.id, job.group, job.task, job.args, finalState)
       )
+      _ <- eventSink.offer(
+        Event.JobDone(
+          job.id,
+          job.group,
+          job.task,
+          job.args,
+          job.state,
+          job.subject,
+          job.submitter
+        )
+      )
     } yield ()
 
   def onStart(job: RJob): F[Unit] =

modules/joexapi/src/main/resources/joex-openapi.yml

@@ -27,6 +27,8 @@ paths:
       description: |
         Returns the version and project name and other properties of the build.
       responses:
+        422:
+          description: BadRequest
         200:
           description: Ok
           content:
@@ -41,6 +43,8 @@ paths:
       description: |
         Notifies the job executor to wake up and look for jobs in th queue.
       responses:
+        422:
+          description: BadRequest
         200:
           description: Ok
           content:
@@ -55,6 +59,8 @@ paths:
       description: |
         Returns all jobs this executor is currently executing.
       responses:
+        422:
+          description: BadRequest
         200:
           description: Ok
           content:
@@ -69,6 +75,8 @@ paths:
       description: |
         Gracefully stops the scheduler and also stops the process.
       responses:
+        422:
+          description: BadRequest
         200:
           description: Ok
           content:
@@ -85,6 +93,8 @@ paths:
       parameters:
         - $ref: "#/components/parameters/id"
       responses:
+        422:
+          description: BadRequest
         200:
           description: Ok
           content:
@@ -103,6 +113,8 @@ paths:
       parameters:
         - $ref: "#/components/parameters/id"
       responses:
+        422:
+          description: BadRequest
         200:
           description: Ok
           content:

modules/jsonminiq/src/main/scala/docspell/jsonminiq/Format.scala

@@ -0,0 +1,59 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.jsonminiq
+
+import cats.implicits._
+
+/** The inverse to Parser */
+private[jsonminiq] object Format {
+
+  def apply(q: JsonMiniQuery): Either[String, String] =
+    q match {
+      case JsonMiniQuery.Empty    => Right("")
+      case JsonMiniQuery.Identity => Right("")
+      case JsonMiniQuery.Fields(fields) =>
+        Right(fields.toVector.mkString(","))
+
+      case JsonMiniQuery.Indexes(nums) =>
+        Right(nums.toVector.mkString("(", ",", ")"))
+
+      case JsonMiniQuery.Filter(values, mt) =>
+        formatValue(values.head).map(v => formatMatchType(mt) + v)
+
+      case JsonMiniQuery.Chain(self, next) =>
+        for {
+          s1 <- apply(self)
+          s2 <- apply(next)
+          res = next match {
+            case _: JsonMiniQuery.Fields =>
+              s1 + "." + s2
+            case _ =>
+              s1 + s2
+          }
+        } yield res
+
+      case JsonMiniQuery.Concat(inner) =>
+        inner.toVector.traverse(apply).map(_.mkString("[", " | ", "]"))
+
+      case JsonMiniQuery.Forall(inner) =>
+        inner.toVector.traverse(apply).map(_.mkString("[", " & ", "]"))
+    }
+
+  def formatValue(v: String): Either[String, String] =
+    if (v.forall(Parser.isValidSimpleValue)) Right(v)
+    else if (v.contains("\"") && v.contains("'"))
+      Left(s"Value cannot use both \" and ': $v")
+    else if (v.contains("'")) Right(s"\"$v\"")
+    else Right(s"'$v'")
+
+  def formatMatchType(matchType: JsonMiniQuery.MatchType): String =
+    matchType match {
+      case JsonMiniQuery.MatchType.All  => "="
+      case JsonMiniQuery.MatchType.Any  => ":"
+      case JsonMiniQuery.MatchType.None => "!"
+    }
+}

modules/jsonminiq/src/main/scala/docspell/jsonminiq/JsonMiniQuery.scala

@@ -0,0 +1,245 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.jsonminiq
+
+import cats.Monoid
+import cats.data.NonEmptyVector
+import cats.implicits._
+
+import io.circe.Decoder
+import io.circe.Encoder
+import io.circe.Json.Folder
+import io.circe.{Json, JsonNumber, JsonObject}
+
+/** Cteate a predicate for a Json value. */
+sealed trait JsonMiniQuery { self =>
+
+  def apply(json: Json): Vector[Json]
+
+  def >>(next: JsonMiniQuery): JsonMiniQuery =
+    JsonMiniQuery.Chain(self, next)
+
+  def ++(other: JsonMiniQuery): JsonMiniQuery =
+    JsonMiniQuery.Concat(NonEmptyVector.of(self, other))
+
+  def thenAny(other: JsonMiniQuery, more: JsonMiniQuery*): JsonMiniQuery =
+    self >> JsonMiniQuery.or(other, more: _*)
+
+  def thenAll(other: JsonMiniQuery, more: JsonMiniQuery*): JsonMiniQuery =
+    self >> JsonMiniQuery.and(other, more: _*)
+
+  def at(field: String, fields: String*): JsonMiniQuery =
+    self >> JsonMiniQuery.Fields(NonEmptyVector(field, fields.toVector))
+
+  def at(index: Int, indexes: Int*): JsonMiniQuery =
+    self >> JsonMiniQuery.Indexes(NonEmptyVector(index, indexes.toVector))
+
+  def isAll(value: String, values: String*): JsonMiniQuery =
+    self >> JsonMiniQuery.Filter(
+      NonEmptyVector(value, values.toVector),
+      JsonMiniQuery.MatchType.All
+    )
+
+  def isAny(value: String, values: String*): JsonMiniQuery =
+    self >> JsonMiniQuery.Filter(
+      NonEmptyVector(value, values.toVector),
+      JsonMiniQuery.MatchType.Any
+    )
+
+  def is(value: String): JsonMiniQuery =
+    isAny(value)
+
+  def &&(other: JsonMiniQuery): JsonMiniQuery =
+    JsonMiniQuery.and(self, other)
+
+  def ||(other: JsonMiniQuery): JsonMiniQuery =
+    self ++ other
+
+  def matches(json: Json): Boolean =
+    apply(json).nonEmpty
+
+  def notMatches(json: Json): Boolean =
+    !matches(json)
+
+  /** Returns a string representation of this that can be parsed back to this value.
+    * Formatting can fail, because not everything is supported. The idea is that every
+    * value that was parsed, can be formatted.
+    */
+  def asString: Either[String, String] =
+    Format(this)
+
+  def unsafeAsString: String =
+    asString.fold(sys.error, identity)
+}
+
+object JsonMiniQuery {
+
+  def parse(str: String): Either[String, JsonMiniQuery] =
+    Parser.query
+      .parseAll(str)
+      .leftMap(err =>
+        s"Unexpected input at ${err.failedAtOffset}. Expected: ${err.expected.toList.mkString(", ")}"
+      )
+
+  def unsafeParse(str: String): JsonMiniQuery =
+    parse(str).fold(sys.error, identity)
+
+  val root: JsonMiniQuery = Identity
+  val id: JsonMiniQuery = Identity
+  val none: JsonMiniQuery = Empty
+
+  def and(self: JsonMiniQuery, more: JsonMiniQuery*): JsonMiniQuery =
+    Forall(NonEmptyVector(self, more.toVector))
+
+  def or(self: JsonMiniQuery, more: JsonMiniQuery*): JsonMiniQuery =
+    Concat(NonEmptyVector(self, more.toVector))
+
+  // --- impl
+
+  case object Identity extends JsonMiniQuery {
+    def apply(json: Json) = Vector(json)
+    override def >>(next: JsonMiniQuery): JsonMiniQuery = next
+  }
+
+  case object Empty extends JsonMiniQuery {
+    def apply(json: Json) = Vector.empty
+    override def at(field: String, fields: String*): JsonMiniQuery = this
+    override def at(field: Int, fields: Int*): JsonMiniQuery = this
+    override def isAll(value: String, values: String*) = this
+    override def isAny(value: String, values: String*) = this
+    override def >>(next: JsonMiniQuery): JsonMiniQuery = this
+    override def ++(other: JsonMiniQuery): JsonMiniQuery = other
+  }
+
+  private def unwrapArrays(json: Vector[Json]): Vector[Json] =
+    json.foldLeft(Vector.empty[Json]) { (res, el) =>
+      el.asArray.map(x => res ++ x).getOrElse(res :+ el)
+    }
+
+  final case class Fields(names: NonEmptyVector[String]) extends JsonMiniQuery {
+    def apply(json: Json) = json.foldWith(folder)
+
+    private val folder: Folder[Vector[Json]] = new Folder[Vector[Json]] {
+      def onNull = Vector.empty
+      def onBoolean(value: Boolean) = Vector.empty
+      def onNumber(value: JsonNumber) = Vector.empty
+      def onString(value: String) = Vector.empty
+      def onArray(value: Vector[Json]) =
+        unwrapArrays(value.flatMap(inner => inner.foldWith(this)))
+      def onObject(value: JsonObject) =
+        unwrapArrays(names.toVector.flatMap(value.apply))
+    }
+  }
+  final case class Indexes(indexes: NonEmptyVector[Int]) extends JsonMiniQuery {
+    def apply(json: Json) = json.foldWith(folder)
+
+    private val folder: Folder[Vector[Json]] = new Folder[Vector[Json]] {
+      def onNull = Vector.empty
+      def onBoolean(value: Boolean) = Vector.empty
+      def onNumber(value: JsonNumber) = Vector.empty
+      def onString(value: String) = Vector.empty
+      def onArray(value: Vector[Json]) =
+        unwrapArrays(indexes.toVector.flatMap(i => value.get(i.toLong)))
+      def onObject(value: JsonObject) =
+        Vector.empty
+    }
+  }
+
+  sealed trait MatchType {
+    def monoid: Monoid[Boolean]
+  }
+  object MatchType {
+    case object Any extends MatchType {
+      val monoid = Monoid.instance(false, _ || _)
+    }
+    case object All extends MatchType {
+      val monoid = Monoid.instance(true, _ && _)
+    }
+    case object None extends MatchType { // = not Any
+      val monoid = Monoid.instance(true, _ && !_)
+    }
+  }
+
+  final case class Filter(
+      values: NonEmptyVector[String],
+      combine: MatchType
+  ) extends JsonMiniQuery {
+    def apply(json: Json): Vector[Json] =
+      json.asArray match {
+        case Some(arr) =>
+          unwrapArrays(arr.filter(el => el.foldWith(folder(combine))))
+        case None =>
+          if (json.foldWith(folder(combine))) unwrapArrays(Vector(json))
+          else Vector.empty
+      }
+
+    private val anyMatch = folder(MatchType.Any)
+
+    private def folder(matchType: MatchType): Folder[Boolean] = new Folder[Boolean] {
+      def onNull =
+        onString("*null*")
+
+      def onBoolean(value: Boolean) =
+        values
+          .map(_.equalsIgnoreCase(value.toString))
+          .fold(matchType.monoid)
+
+      def onNumber(value: JsonNumber) =
+        values
+          .map(
+            _.equalsIgnoreCase(
+              value.toLong.map(_.toString).getOrElse(value.toDouble.toString)
+            )
+          )
+          .fold(matchType.monoid)
+
+      def onString(value: String) =
+        values
+          .map(_.equalsIgnoreCase(value))
+          .fold(matchType.monoid)
+
+      def onArray(value: Vector[Json]) =
+        value
+          .map(inner => inner.foldWith(anyMatch))
+          .fold(matchType.monoid.empty)(matchType.monoid.combine)
+
+      def onObject(value: JsonObject) = false
+    }
+  }
+
+  final case class Chain(self: JsonMiniQuery, next: JsonMiniQuery) extends JsonMiniQuery {
+    def apply(json: Json): Vector[Json] =
+      next(Json.fromValues(self(json)))
+  }
+
+  final case class Concat(qs: NonEmptyVector[JsonMiniQuery]) extends JsonMiniQuery {
+    def apply(json: Json): Vector[Json] =
+      qs.toVector.flatMap(_.apply(json))
+  }
+
+  final case class Forall(qs: NonEmptyVector[JsonMiniQuery]) extends JsonMiniQuery {
+    def apply(json: Json): Vector[Json] =
+      combineWhenNonEmpty(qs.toVector.map(_.apply(json)), Vector.empty)
+
+    @annotation.tailrec
+    private def combineWhenNonEmpty(
+        values: Vector[Vector[Json]],
+        result: Vector[Json]
+    ): Vector[Json] =
+      values.headOption match {
+        case Some(v) if v.nonEmpty => combineWhenNonEmpty(values.tail, result ++ v)
+        case Some(_)               => Vector.empty
+        case None                  => result
+      }
+  }
+
+  implicit val jsonDecoder: Decoder[JsonMiniQuery] =
+    Decoder.decodeString.emap(parse)
+
+  implicit val jsonEncoder: Encoder[JsonMiniQuery] =
+    Encoder.encodeString.contramap(_.unsafeAsString)
+}

modules/jsonminiq/src/main/scala/docspell/jsonminiq/Parser.scala

@@ -0,0 +1,105 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.jsonminiq
+
+import cats.data.NonEmptyVector
+import cats.parse.{Parser => P, Parser0 => P0}
+
+import docspell.jsonminiq.JsonMiniQuery.{Identity => JQ}
+
+private[jsonminiq] object Parser {
+
+  // a[,b]      -> at(string)
+  // (1[,2,3])  -> at(int)
+  // :b         -> isAny(b)
+  // =b         -> isAll(b)
+  // [F & G]    -> F && G
+  // [F | G]    -> F || G
+
+  private[this] val whitespace: P[Unit] = P.charIn(" \t\r\n").void
+  private[this] val extraFieldChars = "_-".toSet
+  private[this] val dontUse = "\"'\\[]()&|".toSet
+
+  private[this] val ws0: P0[Unit] = whitespace.rep0.void
+
+  private[this] val parenOpen: P[Unit] = P.char('(') *> ws0
+  private[this] val parenClose: P[Unit] = ws0.with1 *> P.char(')')
+  private[this] val bracketOpen: P[Unit] = P.char('[') *> ws0
+  private[this] val bracketClose: P[Unit] = ws0.with1 *> P.char(']')
+  private[this] val dot: P[Unit] = P.char('.')
+  private[this] val comma: P[Unit] = P.char(',')
+  private[this] val andSym: P[Unit] = ws0.with1 *> P.char('&') <* ws0
+  private[this] val orSym: P[Unit] = ws0.with1 *> P.char('|') <* ws0
+  private[this] val squote: P[Unit] = P.char('\'')
+  private[this] val dquote: P[Unit] = P.char('"')
+  private[this] val allOp: P[JsonMiniQuery.MatchType] =
+    P.char('=').as(JsonMiniQuery.MatchType.All)
+  private[this] val noneOp: P[JsonMiniQuery.MatchType] =
+    P.char('!').as(JsonMiniQuery.MatchType.None)
+
+  def isValidSimpleValue(c: Char): Boolean =
+    c > ' ' && !dontUse.contains(c)
+
+  val value: P[String] = {
+    val simpleString: P[String] =
+      P.charsWhile(isValidSimpleValue)
+
+    val quotedString: P[String] = {
+      val single: P[String] =
+        squote *> P.charsWhile0(_ != '\'') <* squote
+
+      val double: P[String] =
+        dquote *> P.charsWhile0(_ != '"') <* dquote
+
+      single | double
+    }
+
+    simpleString | quotedString
+  }
+
+  val field: P[String] =
+    P.charsWhile(c => c.isLetterOrDigit || extraFieldChars.contains(c))
+  val posNum: P[Int] = P.charsWhile(_.isDigit).map(_.toInt).filter(_ >= 0)
+
+  val fieldSelect1: P[JsonMiniQuery] =
+    field.repSep(comma).map(nel => JQ.at(nel.head, nel.tail: _*))
+
+  val arraySelect1: P[JsonMiniQuery] = {
+    val nums = posNum.repSep(1, comma)
+    parenOpen.soft *> nums.map(f => JQ.at(f.head, f.tail: _*)) <* parenClose
+  }
+
+  val match1: P[JsonMiniQuery] =
+    ((allOp | noneOp) ~ value).map { case (op, v) =>
+      JsonMiniQuery.Filter(NonEmptyVector.of(v), op)
+    }
+
+  val segment = {
+    val firstSegment = fieldSelect1 | arraySelect1 | match1
+    val nextSegment = (dot *> fieldSelect1) | arraySelect1 | match1
+
+    (firstSegment ~ nextSegment.rep0).map { case (head, tail) =>
+      tail.foldLeft(head)(_ >> _)
+    }
+  }
+
+  def combine(inner: P[JsonMiniQuery]): P[JsonMiniQuery] = {
+    val or = inner.repSep(orSym).map(_.reduceLeft(_ || _))
+    val and = inner.repSep(andSym).map(_.reduceLeft(_ && _))
+
+    and
+      .between(bracketOpen, bracketClose)
+      .backtrack
+      .orElse(or.between(bracketOpen, bracketClose))
+  }
+
+  val query: P[JsonMiniQuery] =
+    P.recursive[JsonMiniQuery] { recurse =>
+      val comb = combine(recurse)
+      P.oneOf(segment :: comb :: Nil).rep.map(_.reduceLeft(_ >> _))
+    }
+}

modules/jsonminiq/src/test/scala/docspell/jsonminiq/Fixtures.scala

@@ -0,0 +1,76 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.jsonminiq
+
+import cats.parse.{Parser => P}
+
+import io.circe.Json
+
+trait Fixtures {
+
+  val sampleEvent: Json =
+    parseJson(
+      """{
+        |  "eventType": "TagsChanged",
+        |  "account": {
+        |    "collective": "demo",
+        |    "user": "demo",
+        |    "login": "demo"
+        |  },
+        |  "content": {
+        |    "account": "demo",
+        |    "items": [
+        |      {
+        |        "id": "4PvMM4m7Fwj-FsPRGxYt9zZ-uUzi35S2rEX-usyDEVyheR8",
+        |        "name": "MapleSirupLtd_202331.pdf",
+        |        "dateMillis": 1633557740733,
+        |        "date": "2021-10-06",
+        |        "direction": "incoming",
+        |        "state": "confirmed",
+        |        "dueDateMillis": 1639173740733,
+        |        "dueDate": "2021-12-10",
+        |        "source": "webapp",
+        |        "overDue": false,
+        |        "dueIn": "in 3 days",
+        |        "corrOrg": "Acme AG",
+        |        "notes": null
+        |      }
+        |    ],
+        |    "added": [
+        |      {
+        |        "id": "Fy4VC6hQwcL-oynrHaJg47D-Q5RiQyB5PQP-N5cFJ368c4N",
+        |        "name": "Invoice",
+        |        "category": "doctype"
+        |      },
+        |      {
+        |        "id": "7zaeU6pqVym-6Je3Q36XNG2-ZdBTFSVwNjc-pJRXciTMP3B",
+        |        "name": "Grocery",
+        |        "category": "expense"
+        |      }      
+        |    ],
+        |    "removed": [
+        |      {
+        |        "id": "GbXgszdjBt4-zrzuLHoUx7N-RMFatC8CyWt-5dsBCvxaEuW",
+        |        "name": "Receipt",
+        |        "category": "doctype"
+        |      }
+        |    ],
+        |    "itemUrl": "http://localhost:7880/app/item"
+        |  }
+        |}""".stripMargin
+    )
+
+  def parseJson(str: String): Json =
+    io.circe.parser.parse(str).fold(throw _, identity)
+
+  def parseP[A](p: P[A], str: String): A =
+    p.parseAll(str.trim())
+      .fold(e => sys.error(s"${e.getClass}: $e"), identity)
+
+  def parse(str: String): JsonMiniQuery = parseP(Parser.query, str)
+
+}

modules/jsonminiq/src/test/scala/docspell/jsonminiq/FormatTest.scala

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.jsonminiq
+
+import docspell.jsonminiq.JsonMiniQuery.{Identity => JQ}
+
+import munit._
+
+class FormatTest extends FunSuite with Fixtures {
+
+  def format(q: JsonMiniQuery): String =
+    q.unsafeAsString
+
+  test("field selects") {
+    assertEquals(
+      format(JQ.at("content").at("added", "removed").at("name")),
+      "content.added,removed.name"
+    )
+  }
+
+  test("array select") {
+    assertEquals(format(JQ.at("content").at(1, 2).at("name")), "content(1,2).name")
+  }
+
+  test("anyMatch / allMatch") {
+    assertEquals(format(JQ.isAny("in voice")), ":'in voice'")
+    assertEquals(format(JQ.isAll("invoice")), "=invoice")
+
+    assertEquals(format(JQ.at("name").isAll("invoice")), "name=invoice")
+    assertEquals(format(JQ.at("name").isAny("invoice")), "name:invoice")
+  }
+
+  test("and / or") {
+    assertEquals(
+      format((JQ.at("c") >> JQ.isAll("d")) || (JQ.at("e") >> JQ.isAll("f"))),
+      "[c=d | e=f]"
+    )
+
+    assertEquals(
+      format(
+        (JQ.at("a").isAll("1")) || (
+          (JQ.at("b").isAll("2")) && (JQ.at("c").isAll("3"))
+        )
+      ),
+      "[a=1 | [b=2 & c=3]]"
+    )
+  }
+}

modules/jsonminiq/src/test/scala/docspell/jsonminiq/JsonMiniQueryTest.scala

@@ -0,0 +1,161 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.jsonminiq
+
+import docspell.jsonminiq.JsonMiniQuery.{Identity => JQ}
+
+import io.circe.Encoder
+import io.circe.Json
+import io.circe.syntax._
+import munit._
+
+class JsonMiniQueryTest extends FunSuite with Fixtures {
+
+  def values[T: Encoder](v1: T, vn: T*): Vector[Json] =
+    (v1 +: vn.toVector).map(_.asJson)
+
+  test("combine values on same level") {
+    val q = JQ
+      .at("content")
+      .at("added", "removed")
+      .at("name")
+
+    assertEquals(q(sampleEvent), values("Invoice", "Grocery", "Receipt"))
+  }
+
+  test("combine values from different levels") {
+    val q1 = JQ.at("account")
+    val q2 = JQ.at("removed").at("name")
+    val q = JQ.at("content") >> (q1 ++ q2)
+
+    assertEquals(q(sampleEvent), values("demo", "Receipt"))
+  }
+
+  test("filter single value") {
+    val q = JQ.at("account").at("login").isAll("demo")
+    assertEquals(q(sampleEvent), values("demo"))
+
+    val q2 = JQ.at("account").at("login").isAll("james")
+    assertEquals(q2(sampleEvent), Vector.empty)
+  }
+
+  test("combine filters") {
+    val q1 = JQ.at("account").at("login").isAll("demo")
+    val q2 = JQ.at("eventType").isAll("tagschanged")
+    val q3 = JQ.at("content").at("added", "removed").at("name").isAny("invoice")
+
+    val q = q1 && q2 && q3
+    assertEquals(
+      q(sampleEvent),
+      values("demo", "TagsChanged", "Invoice")
+    )
+
+    val q11 = JQ.at("account").at("login").isAll("not-exists")
+    val r = q11 && q2 && q3
+    assertEquals(r(sampleEvent), Vector.empty)
+  }
+
+  //content.[added,removed].(category=expense & name=grocery)
+  test("combine fields and filter") {
+    val andOk = JQ.at("content").at("added", "removed") >>
+      (JQ.at("name").is("grocery") && JQ.at("category").is("expense"))
+    assert(andOk.matches(sampleEvent))
+
+    val andNotOk = JQ.at("content").at("added", "removed") >>
+      (JQ.at("name").is("grocery") && JQ.at("category").is("notexist"))
+    assert(andNotOk.notMatches(sampleEvent))
+
+    val orOk = JQ.at("content").at("added", "removed") >>
+      (JQ.at("name").is("grocery") || JQ.at("category").is("notexist"))
+    assert(orOk.matches(sampleEvent))
+  }
+
+  test("thenAny combine via or") {
+    val q = JQ
+      .at("content")
+      .thenAny(
+        JQ.is("not this"),
+        JQ.at("account"),
+        JQ.at("oops")
+      )
+    assert(q.matches(sampleEvent))
+  }
+
+  test("thenAll combine via and (1)") {
+    val q = JQ
+      .at("content")
+      .thenAll(
+        JQ.is("not this"),
+        JQ.at("account"),
+        JQ.at("oops")
+      )
+    assert(q.notMatches(sampleEvent))
+  }
+
+  test("thenAll combine via and (2)") {
+    val q = JQ
+      .at("content")
+      .thenAll(
+        JQ.at("items").at("date").is("2021-10-06"),
+        JQ.at("account"),
+        JQ.at("added").at("name")
+      )
+    assert(q.matches(sampleEvent))
+
+    // equivalent
+    val q2 = JQ.at("content") >> (
+      JQ.at("items").at("date").is("2021-10-06") &&
+        JQ.at("account") &&
+        JQ.at("added").at("name")
+    )
+    assert(q2.matches(sampleEvent))
+  }
+
+  test("test for null/not null") {
+    val q1 = parse("content.items.notes=*null*")
+    assert(q1.matches(sampleEvent))
+
+    val q2 = parse("content.items.notes=bla")
+    assert(q2.notMatches(sampleEvent))
+
+    val q3 = parse("content.items.notes!*null*")
+    assert(q3.notMatches(sampleEvent))
+  }
+
+  test("more real expressions") {
+    val q = parse("content.added,removed[name=invoice | category=expense]")
+    assert(q.matches(sampleEvent))
+  }
+
+  test("examples") {
+    val q0 = parse("a.b.x,y")
+    val json = parseJson(
+      """[{"a": {"b": {"x": 1, "y":2}}, "v": 0}, {"a": {"b": {"y": 9, "b": 2}}, "z": 0}]"""
+    )
+    assertEquals(q0(json), values(1, 2, 9))
+
+    val q1 = parse("a(0,2)")
+    val json1 = parseJson("""[{"a": [10,9,8,7]}, {"a": [1,2,3,4]}]""")
+    assertEquals(q1(json1), values(10, 8))
+
+    val q2 = parse("=blue")
+    val json2 = parseJson("""["blue", "green", "red"]""")
+    assertEquals(q2(json2), values("blue"))
+
+    val q3 = parse("color=blue")
+    val json3 = parseJson(
+      """[{"color": "blue", "count": 2}, {"color": "blue", "count": 1}, {"color": "blue", "count": 3}]"""
+    )
+    assertEquals(q3(json3), values("blue", "blue", "blue"))
+
+    val q4 = parse("[count=6 | name=max]")
+    val json4 = parseJson(
+      """[{"name":"max", "count":4}, {"name":"me", "count": 3}, {"name":"max", "count": 3}]"""
+    )
+    println(q4(json4))
+  }
+}

modules/jsonminiq/src/test/scala/docspell/jsonminiq/ParserTest.scala

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.jsonminiq
+
+import docspell.jsonminiq.JsonMiniQuery.{Identity => JQ}
+
+import munit._
+
+class ParserTest extends FunSuite with Fixtures {
+
+  test("field selects") {
+    assertEquals(
+      parse("content.added,removed.name"),
+      JQ.at("content").at("added", "removed").at("name")
+    )
+  }
+
+  test("array select") {
+    assertEquals(parse("content(1,2).name"), JQ.at("content").at(1, 2).at("name"))
+  }
+
+  test("values") {
+    assertEquals(parseP(Parser.value, "\"in voice\""), "in voice")
+    assertEquals(parseP(Parser.value, "'in voice'"), "in voice")
+    assertEquals(parseP(Parser.value, "invoice"), "invoice")
+    intercept[Throwable](parseP(Parser.value, "in voice"))
+  }
+
+  test("anyMatch / allMatch") {
+    assertEquals(parse("='invoice'"), JQ.isAll("invoice"))
+    assertEquals(parse("=invoice"), JQ.isAll("invoice"))
+
+    assertEquals(parse("name=invoice"), JQ.at("name").isAll("invoice"))
+    assertEquals(parse("name=\"invoice\""), JQ.at("name").isAll("invoice"))
+  }
+
+  test("and / or") {
+    assertEquals(
+      parse("[c=d | e=f]"),
+      (JQ.at("c") >> JQ.isAll("d")) || (JQ.at("e") >> JQ.isAll("f"))
+    )
+
+    assertEquals(
+      parse("[a=1 | [b=2 & c=3]]"),
+      (JQ.at("a") >> JQ.isAll("1")) || (
+        (JQ.at("b") >> JQ.isAll("2")) && (JQ.at("c") >> JQ.isAll("3"))
+      )
+    )
+  }
+}

modules/notification/api/src/main/scala/docspell/notification/api/Channel.scala

@@ -0,0 +1,112 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.api
+
+import cats.data.{NonEmptyList => Nel}
+
+import docspell.common._
+
+import emil.MailAddress
+import io.circe.generic.extras.Configuration
+import io.circe.generic.extras.semiauto.{deriveConfiguredDecoder, deriveConfiguredEncoder}
+import io.circe.{Decoder, Encoder}
+
+/** A type for representing channels as stored in the database. */
+sealed trait Channel {
+  def id: Ident
+  def channelType: ChannelType
+  def fold[A](
+      f1: Channel.Mail => A,
+      f2: Channel.Gotify => A,
+      f3: Channel.Matrix => A,
+      f4: Channel.Http => A
+  ): A
+  def asRef: ChannelRef = ChannelRef(id, channelType)
+}
+
+object Channel {
+  implicit val jsonConfig = Configuration.default.withDiscriminator("channelType")
+
+  final case class Mail(
+      id: Ident,
+      connection: Ident,
+      recipients: Nel[MailAddress]
+  ) extends Channel {
+    val channelType = ChannelType.Mail
+    def fold[A](
+        f1: Mail => A,
+        f2: Gotify => A,
+        f3: Matrix => A,
+        f4: Http => A
+    ): A = f1(this)
+  }
+
+  object Mail {
+    implicit def jsonDecoder(implicit D: Decoder[MailAddress]): Decoder[Mail] =
+      deriveConfiguredDecoder[Mail]
+
+    implicit def jsonEncoder(implicit E: Encoder[MailAddress]): Encoder[Mail] =
+      deriveConfiguredEncoder[Mail]
+  }
+
+  final case class Gotify(id: Ident, url: LenientUri, appKey: Password) extends Channel {
+    val channelType = ChannelType.Gotify
+    def fold[A](
+        f1: Mail => A,
+        f2: Gotify => A,
+        f3: Matrix => A,
+        f4: Http => A
+    ): A = f2(this)
+  }
+
+  object Gotify {
+    implicit val jsonDecoder: Decoder[Gotify] =
+      deriveConfiguredDecoder
+    implicit val jsonEncoder: Encoder[Gotify] =
+      deriveConfiguredEncoder
+  }
+
+  final case class Matrix(
+      id: Ident,
+      homeServer: LenientUri,
+      roomId: String,
+      accessToken: Password
+  ) extends Channel {
+    val channelType = ChannelType.Matrix
+    def fold[A](
+        f1: Mail => A,
+        f2: Gotify => A,
+        f3: Matrix => A,
+        f4: Http => A
+    ): A = f3(this)
+  }
+
+  object Matrix {
+    implicit val jsonDecoder: Decoder[Matrix] = deriveConfiguredDecoder
+    implicit val jsonEncoder: Encoder[Matrix] = deriveConfiguredEncoder
+  }
+
+  final case class Http(id: Ident, url: LenientUri) extends Channel {
+    val channelType = ChannelType.Http
+    def fold[A](
+        f1: Mail => A,
+        f2: Gotify => A,
+        f3: Matrix => A,
+        f4: Http => A
+    ): A = f4(this)
+  }
+
+  object Http {
+    implicit val jsonDecoder: Decoder[Http] = deriveConfiguredDecoder
+    implicit val jsonEncoder: Encoder[Http] = deriveConfiguredEncoder
+  }
+
+  implicit def jsonDecoder(implicit mc: Decoder[MailAddress]): Decoder[Channel] =
+    deriveConfiguredDecoder
+  implicit def jsonEncoder(implicit mc: Encoder[MailAddress]): Encoder[Channel] =
+    deriveConfiguredEncoder
+}

modules/notification/api/src/main/scala/docspell/notification/api/ChannelRef.scala

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.api
+
+import docspell.common.Ident
+
+import io.circe.Decoder
+import io.circe.Encoder
+import io.circe.generic.semiauto.{deriveDecoder, deriveEncoder}
+
+final case class ChannelRef(id: Ident, channelType: ChannelType)
+
+object ChannelRef {
+
+  implicit val jsonDecoder: Decoder[ChannelRef] =
+    deriveDecoder
+
+  implicit val jsonEncoder: Encoder[ChannelRef] =
+    deriveEncoder
+}

modules/notification/api/src/main/scala/docspell/notification/api/ChannelType.scala

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.api
+
+import cats.data.{NonEmptyList => Nel}
+
+import io.circe.Decoder
+import io.circe.Encoder
+
+sealed trait ChannelType { self: Product =>
+
+  def name: String =
+    productPrefix
+}
+
+object ChannelType {
+
+  case object Mail extends ChannelType
+  case object Gotify extends ChannelType
+  case object Matrix extends ChannelType
+  case object Http extends ChannelType
+
+  val all: Nel[ChannelType] =
+    Nel.of(Mail, Gotify, Matrix, Http)
+
+  def fromString(str: String): Either[String, ChannelType] =
+    str.toLowerCase match {
+      case "mail"   => Right(Mail)
+      case "gotify" => Right(Gotify)
+      case "matrix" => Right(Matrix)
+      case "http"   => Right(Http)
+      case _        => Left(s"Unknown channel type: $str")
+    }
+
+  def unsafeFromString(str: String): ChannelType =
+    fromString(str).fold(sys.error, identity)
+
+  implicit val jsonDecoder: Decoder[ChannelType] =
+    Decoder.decodeString.emap(fromString)
+  implicit val jsonEncoder: Encoder[ChannelType] =
+    Encoder.encodeString.contramap(_.name)
+}

modules/notification/api/src/main/scala/docspell/notification/api/Event.scala

@@ -0,0 +1,246 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.api
+
+import cats.data.{NonEmptyList => Nel}
+import cats.effect.kernel.Sync
+import cats.implicits._
+
+import docspell.common._
+
+import io.circe.{Decoder, Encoder}
+
+/** An event generated in the platform. */
+sealed trait Event {
+
+  /** The type of event */
+  def eventType: EventType
+
+  /** The user who caused it. */
+  def account: AccountId
+
+  /** The base url for generating links. This is dynamic. */
+  def baseUrl: Option[LenientUri]
+}
+
+sealed trait EventType { self: Product =>
+
+  def name: String =
+    productPrefix
+}
+
+object EventType {
+
+  def all: Nel[EventType] =
+    Nel.of(
+      Event.TagsChanged,
+      Event.SetFieldValue,
+      Event.DeleteFieldValue,
+      Event.ItemSelection,
+      Event.JobSubmitted,
+      Event.JobDone
+    )
+
+  def fromString(str: String): Either[String, EventType] =
+    all.find(_.name.equalsIgnoreCase(str)).toRight(s"Unknown event type: $str")
+
+  def unsafeFromString(str: String): EventType =
+    fromString(str).fold(sys.error, identity)
+
+  implicit val jsonDecoder: Decoder[EventType] =
+    Decoder.decodeString.emap(fromString)
+
+  implicit val jsonEncoder: Encoder[EventType] =
+    Encoder.encodeString.contramap(_.name)
+}
+
+object Event {
+
+  /** Event triggered when tags of one or more items have changed */
+  final case class TagsChanged(
+      account: AccountId,
+      items: Nel[Ident],
+      added: List[String],
+      removed: List[String],
+      baseUrl: Option[LenientUri]
+  ) extends Event {
+    val eventType = TagsChanged
+  }
+  case object TagsChanged extends EventType {
+    def partial(
+        items: Nel[Ident],
+        added: List[String],
+        removed: List[String]
+    ): (AccountId, Option[LenientUri]) => TagsChanged =
+      (acc, url) => TagsChanged(acc, items, added, removed, url)
+
+    def sample[F[_]: Sync](
+        account: AccountId,
+        baseUrl: Option[LenientUri]
+    ): F[TagsChanged] =
+      for {
+        id1 <- Ident.randomId[F]
+        id2 <- Ident.randomId[F]
+        id3 <- Ident.randomId[F]
+      } yield TagsChanged(account, Nel.of(id1), List(id2.id), List(id3.id), baseUrl)
+  }
+
+  /** Event triggered when a custom field on an item changes. */
+  final case class SetFieldValue(
+      account: AccountId,
+      items: Nel[Ident],
+      field: Ident,
+      value: String,
+      baseUrl: Option[LenientUri]
+  ) extends Event {
+    val eventType = SetFieldValue
+  }
+  case object SetFieldValue extends EventType {
+    def partial(
+        items: Nel[Ident],
+        field: Ident,
+        value: String
+    ): (AccountId, Option[LenientUri]) => SetFieldValue =
+      (acc, url) => SetFieldValue(acc, items, field, value, url)
+
+    def sample[F[_]: Sync](
+        account: AccountId,
+        baseUrl: Option[LenientUri]
+    ): F[SetFieldValue] =
+      for {
+        id1 <- Ident.randomId[F]
+        id2 <- Ident.randomId[F]
+      } yield SetFieldValue(account, Nel.of(id1), id2, "10.15", baseUrl)
+  }
+
+  final case class DeleteFieldValue(
+      account: AccountId,
+      items: Nel[Ident],
+      field: Ident,
+      baseUrl: Option[LenientUri]
+  ) extends Event {
+    val eventType = DeleteFieldValue
+  }
+  case object DeleteFieldValue extends EventType {
+    def partial(
+        items: Nel[Ident],
+        field: Ident
+    ): (AccountId, Option[LenientUri]) => DeleteFieldValue =
+      (acc, url) => DeleteFieldValue(acc, items, field, url)
+
+    def sample[F[_]: Sync](
+        account: AccountId,
+        baseUrl: Option[LenientUri]
+    ): F[DeleteFieldValue] =
+      for {
+        id1 <- Ident.randomId[F]
+        id2 <- Ident.randomId[F]
+      } yield DeleteFieldValue(account, Nel.of(id1), id2, baseUrl)
+
+  }
+
+  /** Some generic list of items, chosen by a user. */
+  final case class ItemSelection(
+      account: AccountId,
+      items: Nel[Ident],
+      more: Boolean,
+      baseUrl: Option[LenientUri]
+  ) extends Event {
+    val eventType = ItemSelection
+  }
+
+  case object ItemSelection extends EventType {
+    def sample[F[_]: Sync](
+        account: AccountId,
+        baseUrl: Option[LenientUri]
+    ): F[ItemSelection] =
+      for {
+        id1 <- Ident.randomId[F]
+        id2 <- Ident.randomId[F]
+      } yield ItemSelection(account, Nel.of(id1, id2), true, baseUrl)
+  }
+
+  /** Event when a new job is added to the queue */
+  final case class JobSubmitted(
+      jobId: Ident,
+      group: Ident,
+      task: Ident,
+      args: String,
+      state: JobState,
+      subject: String,
+      submitter: Ident
+  ) extends Event {
+    val eventType = JobSubmitted
+    val baseUrl = None
+    def account: AccountId = AccountId(group, submitter)
+  }
+  case object JobSubmitted extends EventType {
+    def sample[F[_]: Sync](account: AccountId): F[JobSubmitted] =
+      for {
+        id <- Ident.randomId[F]
+        ev = JobSubmitted(
+          id,
+          account.collective,
+          Ident.unsafe("process-something-task"),
+          "",
+          JobState.running,
+          "Process 3 files",
+          account.user
+        )
+      } yield ev
+  }
+
+  /** Event when a job is finished (in final state). */
+  final case class JobDone(
+      jobId: Ident,
+      group: Ident,
+      task: Ident,
+      args: String,
+      state: JobState,
+      subject: String,
+      submitter: Ident
+  ) extends Event {
+    val eventType = JobDone
+    val baseUrl = None
+    def account: AccountId = AccountId(group, submitter)
+  }
+  case object JobDone extends EventType {
+    def sample[F[_]: Sync](account: AccountId): F[JobDone] =
+      for {
+        id <- Ident.randomId[F]
+        ev = JobDone(
+          id,
+          account.collective,
+          Ident.unsafe("process-something-task"),
+          "",
+          JobState.running,
+          "Process 3 files",
+          account.user
+        )
+      } yield ev
+  }
+
+  def sample[F[_]: Sync](
+      evt: EventType,
+      account: AccountId,
+      baseUrl: Option[LenientUri]
+  ): F[Event] =
+    evt match {
+      case TagsChanged =>
+        TagsChanged.sample[F](account, baseUrl).map(x => x: Event)
+      case SetFieldValue =>
+        SetFieldValue.sample[F](account, baseUrl).map(x => x: Event)
+      case ItemSelection =>
+        ItemSelection.sample[F](account, baseUrl).map(x => x: Event)
+      case JobSubmitted =>
+        JobSubmitted.sample[F](account).map(x => x: Event)
+      case JobDone =>
+        JobDone.sample[F](account).map(x => x: Event)
+      case DeleteFieldValue =>
+        DeleteFieldValue.sample[F](account, baseUrl).map(x => x: Event)
+    }
+}

modules/notification/api/src/main/scala/docspell/notification/api/EventCodec.scala

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.api
+
+import docspell.notification.api.Event._
+
+import io.circe.generic.semiauto.{deriveDecoder, deriveEncoder}
+import io.circe.{Decoder, Encoder}
+
+trait EventCodec {
+
+  implicit val tagsChangedDecoder: Decoder[TagsChanged] = deriveDecoder
+  implicit val tagsChangedEncoder: Encoder[TagsChanged] = deriveEncoder
+
+  implicit val eventDecoder: Decoder[Event] =
+    deriveDecoder
+  implicit val eventEncoder: Encoder[Event] =
+    deriveEncoder
+}

modules/notification/api/src/main/scala/docspell/notification/api/EventContext.scala

@@ -0,0 +1,91 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.api
+
+import cats.Applicative
+import cats.Functor
+import cats.data.Kleisli
+import cats.data.OptionT
+
+import io.circe.Json
+import io.circe.syntax._
+
+trait EventContext {
+
+  def event: Event
+
+  def content: Json
+
+  lazy val asJson: Json =
+    Json.obj(
+      "eventType" -> event.eventType.asJson,
+      "account" -> Json.obj(
+        "collective" -> event.account.collective.asJson,
+        "user" -> event.account.user.asJson,
+        "login" -> event.account.asJson
+      ),
+      "content" -> content
+    )
+
+  def defaultTitle: String
+  def defaultTitleHtml: String
+
+  def defaultBody: String
+  def defaultBodyHtml: String
+
+  def defaultBoth: String
+  def defaultBothHtml: String
+
+  lazy val asJsonWithMessage: Json = {
+    val data = asJson
+    val msg = Json.obj(
+      "message" -> Json.obj(
+        "title" -> defaultTitle.asJson,
+        "body" -> defaultBody.asJson
+      ),
+      "messageHtml" -> Json.obj(
+        "title" -> defaultTitleHtml.asJson,
+        "body" -> defaultBodyHtml.asJson
+      )
+    )
+
+    data.withObject(o1 => msg.withObject(o2 => o1.deepMerge(o2).asJson))
+  }
+}
+
+object EventContext {
+  def empty[F[_]](ev: Event): EventContext =
+    new EventContext {
+      val event = ev
+      def content = Json.obj()
+      def defaultTitle = ""
+      def defaultTitleHtml = ""
+      def defaultBody = ""
+      def defaultBodyHtml = ""
+      def defaultBoth: String = ""
+      def defaultBothHtml: String = ""
+    }
+
+  /** For an event, the context can be created that is usually amended with more
+    * information. Since these information may be missing, it is possible that no context
+    * can be created.
+    */
+  type Factory[F[_], E <: Event] = Kleisli[OptionT[F, *], E, EventContext]
+
+  def factory[F[_]: Functor, E <: Event](
+      run: E => F[EventContext]
+  ): Factory[F, E] =
+    Kleisli(run).mapK(OptionT.liftK[F])
+
+  def pure[F[_]: Applicative, E <: Event](run: E => EventContext): Factory[F, E] =
+    factory(ev => Applicative[F].pure(run(ev)))
+
+  type Example[F[_], E <: Event] = Kleisli[F, E, EventContext]
+
+  def example[F[_], E <: Event](run: E => F[EventContext]): Example[F, E] =
+    Kleisli(run)
+}

modules/notification/api/src/main/scala/docspell/notification/api/EventExchange.scala

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.api
+
+import cats.Applicative
+import cats.data.Kleisli
+import cats.effect._
+import cats.effect.std.Queue
+import cats.implicits._
+import fs2.Stream
+
+import docspell.common.Logger
+
+/** Combines a sink and reader to a place where events can be submitted and processed in a
+  * producer-consumer manner.
+  */
+trait EventExchange[F[_]] extends EventSink[F] with EventReader[F] {}
+
+object EventExchange {
+  private[this] val logger = org.log4s.getLogger
+
+  def silent[F[_]: Applicative]: EventExchange[F] =
+    new EventExchange[F] {
+      def offer(event: Event): F[Unit] =
+        EventSink.silent[F].offer(event)
+
+      def consume(maxConcurrent: Int)(run: Kleisli[F, Event, Unit]): Stream[F, Nothing] =
+        Stream.empty.covary[F]
+    }
+
+  def circularQueue[F[_]: Async](queueSize: Int): F[EventExchange[F]] =
+    Queue.circularBuffer[F, Event](queueSize).map(q => new Impl(q))
+
+  final class Impl[F[_]: Async](queue: Queue[F, Event]) extends EventExchange[F] {
+    private[this] val log = Logger.log4s[F](logger)
+
+    def offer(event: Event): F[Unit] =
+      log.debug(s"Pushing event to queue: $event") *>
+        queue.offer(event)
+
+    private val logEvent: Kleisli[F, Event, Unit] =
+      Kleisli(ev => log.debug(s"Consuming event: $ev"))
+
+    def consume(maxConcurrent: Int)(run: Kleisli[F, Event, Unit]): Stream[F, Nothing] = {
+      val stream = Stream.repeatEval(queue.take).evalMap((logEvent >> run).run)
+      log.s.info(s"Starting up $maxConcurrent notification event consumers").drain ++
+        Stream(stream).repeat.take(maxConcurrent.toLong).parJoin(maxConcurrent).drain
+    }
+  }
+}

modules/notification/api/src/main/scala/docspell/notification/api/EventReader.scala

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.api
+
+import cats.data.Kleisli
+import fs2.Stream
+
+trait EventReader[F[_]] {
+
+  /** Stream to allow processing of events offered via a `EventSink` */
+  def consume(maxConcurrent: Int)(run: Kleisli[F, Event, Unit]): Stream[F, Nothing]
+
+}

modules/notification/api/src/main/scala/docspell/notification/api/EventSink.scala

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.api
+
+import cats.Applicative
+import cats.implicits._
+
+trait EventSink[F[_]] {
+
+  /** Submit the event for asynchronous processing. */
+  def offer(event: Event): F[Unit]
+}
+
+object EventSink {
+
+  def apply[F[_]](run: Event => F[Unit]): EventSink[F] =
+    (event: Event) => run(event)
+
+  def silent[F[_]: Applicative]: EventSink[F] =
+    EventSink(_ => ().pure[F])
+}

modules/notification/api/src/main/scala/docspell/notification/api/NotificationBackend.scala

@@ -0,0 +1,89 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.api
+
+import cats.Applicative
+import cats.data.NonEmptyList
+import cats.effect._
+import cats.implicits._
+import cats.kernel.Monoid
+import fs2.Stream
+
+import docspell.common._
+
+/** Pushes notification messages/events to an external system */
+trait NotificationBackend[F[_]] {
+
+  def send(event: EventContext): F[Unit]
+
+}
+
+object NotificationBackend {
+
+  def apply[F[_]](run: EventContext => F[Unit]): NotificationBackend[F] =
+    (event: EventContext) => run(event)
+
+  def silent[F[_]: Applicative]: NotificationBackend[F] =
+    NotificationBackend(_ => ().pure[F])
+
+  def combine[F[_]: Concurrent](
+      ba: NotificationBackend[F],
+      bb: NotificationBackend[F]
+  ): NotificationBackend[F] =
+    (ba, bb) match {
+      case (a: Combined[F], b: Combined[F]) =>
+        Combined(a.delegates.concatNel(b.delegates))
+      case (a: Combined[F], _) =>
+        Combined(bb :: a.delegates)
+      case (_, b: Combined[F]) =>
+        Combined(ba :: b.delegates)
+      case (_, _) =>
+        Combined(NonEmptyList.of(ba, bb))
+    }
+
+  def ignoreErrors[F[_]: Sync](
+      logger: Logger[F]
+  )(nb: NotificationBackend[F]): NotificationBackend[F] =
+    NotificationBackend { event =>
+      nb.send(event).attempt.flatMap {
+        case Right(_) =>
+          logger.debug(s"Successfully sent notification: $event")
+        case Left(ex) =>
+          logger.error(ex)(s"Error sending notification: $event")
+      }
+    }
+
+  final private case class Combined[F[_]: Concurrent](
+      delegates: NonEmptyList[NotificationBackend[F]]
+  ) extends NotificationBackend[F] {
+    val parNum = math.max(2, Runtime.getRuntime.availableProcessors() * 2)
+
+    def send(event: EventContext): F[Unit] =
+      Stream
+        .emits(delegates.toList)
+        .covary[F]
+        .parEvalMapUnordered(math.min(delegates.size, parNum))(_.send(event))
+        .drain
+        .compile
+        .drain
+  }
+
+  def combineAll[F[_]: Concurrent](
+      bes: NonEmptyList[NotificationBackend[F]]
+  ): NotificationBackend[F] =
+    bes.tail match {
+      case Nil => bes.head
+      case next :: Nil =>
+        Combined(NonEmptyList.of(bes.head, next))
+      case next :: more =>
+        val first: NotificationBackend[F] = Combined(NonEmptyList.of(bes.head, next))
+        more.foldLeft(first)(combine)
+    }
+
+  implicit def monoid[F[_]: Concurrent]: Monoid[NotificationBackend[F]] =
+    Monoid.instance(silent[F], combine[F])
+}

modules/notification/api/src/main/scala/docspell/notification/api/NotificationChannel.scala

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.api
+
+import cats.data.NonEmptyList
+
+import docspell.common._
+
+import emil._
+
+sealed trait NotificationChannel { self: Product =>
+  def name: String =
+    productPrefix.toLowerCase
+}
+
+object NotificationChannel {
+
+  final case class Email(
+      config: MailConfig,
+      from: MailAddress,
+      recipients: NonEmptyList[MailAddress]
+  ) extends NotificationChannel
+
+  final case class HttpPost(
+      url: LenientUri,
+      headers: Map[String, String]
+  ) extends NotificationChannel
+
+  final case class Gotify(url: LenientUri, appKey: Password) extends NotificationChannel
+
+  final case class Matrix(
+      homeServer: LenientUri,
+      roomId: String,
+      accessToken: Password,
+      messageType: String
+  ) extends NotificationChannel
+}

modules/notification/api/src/main/scala/docspell/notification/api/NotificationModule.scala

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.api
+
+import cats.Applicative
+import cats.data.{Kleisli, OptionT}
+import cats.implicits._
+import fs2.Stream
+
+import docspell.common.Logger
+
+trait NotificationModule[F[_]]
+    extends EventSink[F]
+    with EventReader[F]
+    with EventExchange[F] {
+
+  /** Sends an event as notification through configured channels. */
+  def notifyEvent: Kleisli[F, Event, Unit]
+
+  /** Send the event data via the given channels. */
+  def send(
+      logger: Logger[F],
+      event: EventContext,
+      channels: Seq[NotificationChannel]
+  ): F[Unit]
+
+  /** Amend an event with additional data. */
+  def eventContext: EventContext.Factory[F, Event]
+
+  /** Create an example event context. */
+  def sampleEvent: EventContext.Example[F, Event]
+
+  /** Consume all offered events asynchronously. */
+  def consumeAllEvents(maxConcurrent: Int): Stream[F, Nothing] =
+    consume(maxConcurrent)(notifyEvent)
+}
+
+object NotificationModule {
+
+  def noop[F[_]: Applicative]: NotificationModule[F] =
+    new NotificationModule[F] {
+      val noSend = NotificationBackend.silent[F]
+      val noExchange = EventExchange.silent[F]
+
+      def notifyEvent = Kleisli(_ => ().pure[F])
+      def eventContext = Kleisli(_ => OptionT.none[F, EventContext])
+      def sampleEvent = EventContext.example(ev => EventContext.empty(ev).pure[F])
+      def send(
+          logger: Logger[F],
+          event: EventContext,
+          channels: Seq[NotificationChannel]
+      ) =
+        noSend.send(event)
+      def offer(event: Event) = noExchange.offer(event)
+      def consume(maxConcurrent: Int)(run: Kleisli[F, Event, Unit]) =
+        noExchange.consume(maxConcurrent)(run)
+    }
+}

modules/notification/api/src/main/scala/docspell/notification/api/PeriodicDueItemsArgs.scala

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.api
+
+import docspell.common._
+
+import emil.MailAddress
+import io.circe.generic.semiauto
+import io.circe.{Decoder, Encoder}
+
+final case class PeriodicDueItemsArgs(
+    account: AccountId,
+    channel: ChannelOrRef,
+    remindDays: Int,
+    daysBack: Option[Int],
+    tagsInclude: List[Ident],
+    tagsExclude: List[Ident],
+    baseUrl: Option[LenientUri]
+)
+
+object PeriodicDueItemsArgs {
+  val taskName = Ident.unsafe("periodic-due-items-notify")
+
+  implicit def jsonDecoder(implicit
+      mc: Decoder[MailAddress]
+  ): Decoder[PeriodicDueItemsArgs] = {
+    implicit val x = ChannelOrRef.jsonDecoder
+    semiauto.deriveDecoder
+  }
+
+  implicit def jsonEncoder(implicit
+      mc: Encoder[MailAddress]
+  ): Encoder[PeriodicDueItemsArgs] = {
+    implicit val x = ChannelOrRef.jsonEncoder
+    semiauto.deriveEncoder
+  }
+}

modules/notification/api/src/main/scala/docspell/notification/api/PeriodicQueryArgs.scala

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.api
+
+import docspell.common._
+
+import emil.MailAddress
+import io.circe.generic.semiauto
+import io.circe.{Decoder, Encoder}
+
+final case class PeriodicQueryArgs(
+    account: AccountId,
+    channel: ChannelOrRef,
+    query: ItemQueryString,
+    baseUrl: Option[LenientUri]
+)
+
+object PeriodicQueryArgs {
+  val taskName = Ident.unsafe("periodic-query-notify")
+
+  implicit def jsonDecoder(implicit
+      mc: Decoder[MailAddress]
+  ): Decoder[PeriodicQueryArgs] = {
+    implicit val x = ChannelOrRef.jsonDecoder
+    semiauto.deriveDecoder
+  }
+
+  implicit def jsonEncoder(implicit
+      mc: Encoder[MailAddress]
+  ): Encoder[PeriodicQueryArgs] = {
+    implicit val x = ChannelOrRef.jsonEncoder
+    semiauto.deriveEncoder
+  }
+}

modules/notification/api/src/main/scala/docspell/notification/api/package.scala

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification
+
+import emil.MailAddress
+import io.circe.{Decoder, Encoder}
+
+package object api {
+
+  type ChannelOrRef = Either[ChannelRef, Channel]
+
+  object ChannelOrRef {
+    implicit def jsonDecoder(implicit mc: Decoder[MailAddress]): Decoder[ChannelOrRef] =
+      Channel.jsonDecoder.either(ChannelRef.jsonDecoder).map(_.swap)
+
+    implicit def jsonEncoder(implicit mc: Encoder[MailAddress]): Encoder[ChannelOrRef] =
+      Encoder.instance(_.fold(ChannelRef.jsonEncoder.apply, Channel.jsonEncoder.apply))
+
+    implicit class ChannelOrRefOpts(cr: ChannelOrRef) {
+      def channelType: ChannelType =
+        cr.fold(_.channelType, _.channelType)
+    }
+  }
+
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/AbstractEventContext.scala

@@ -0,0 +1,63 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl
+
+import docspell.notification.api.EventContext
+
+import yamusca.circe._
+import yamusca.implicits._
+import yamusca.imports._
+
+abstract class AbstractEventContext extends EventContext {
+
+  def titleTemplate: Template
+
+  def bodyTemplate: Template
+
+  def render(template: Template): String =
+    asJson.render(template).trim()
+
+  def renderHtml(template: Template): String =
+    Markdown.toHtml(render(template))
+
+  lazy val defaultTitle: String =
+    render(titleTemplate)
+
+  lazy val defaultTitleHtml: String =
+    renderHtml(titleTemplate)
+
+  lazy val defaultBody: String =
+    render(bodyTemplate)
+
+  lazy val defaultBodyHtml: String =
+    renderHtml(bodyTemplate)
+
+  lazy val defaultBoth: String =
+    render(
+      AbstractEventContext.concat(
+        titleTemplate,
+        AbstractEventContext.sepTemplate,
+        bodyTemplate
+      )
+    )
+
+  lazy val defaultBothHtml: String =
+    renderHtml(
+      AbstractEventContext.concat(
+        titleTemplate,
+        AbstractEventContext.sepTemplate,
+        bodyTemplate
+      )
+    )
+}
+
+object AbstractEventContext {
+  private val sepTemplate: Template = mustache": "
+
+  private def concat(t1: Template, ts: Template*): Template =
+    Template(ts.foldLeft(t1.els)((res, el) => res ++ el.els))
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/DbEventContext.scala

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl
+
+import cats.data.Kleisli
+
+import docspell.notification.api.{Event, EventContext}
+import docspell.notification.impl.context._
+
+import doobie._
+
+object DbEventContext {
+
+  type Factory = EventContext.Factory[ConnectionIO, Event]
+
+  def apply: Factory =
+    Kleisli {
+      case ev: Event.TagsChanged =>
+        TagsChangedCtx.apply.run(ev)
+
+      case ev: Event.SetFieldValue =>
+        SetFieldValueCtx.apply.run(ev)
+
+      case ev: Event.DeleteFieldValue =>
+        DeleteFieldValueCtx.apply.run(ev)
+
+      case ev: Event.ItemSelection =>
+        ItemSelectionCtx.apply.run(ev)
+
+      case ev: Event.JobSubmitted =>
+        JobSubmittedCtx.apply.run(ev)
+
+      case ev: Event.JobDone =>
+        JobDoneCtx.apply.run(ev)
+    }
+
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/EmailBackend.scala

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl
+
+import cats.effect._
+import cats.implicits._
+
+import docspell.common._
+import docspell.notification.api._
+
+import emil.Emil
+import emil.markdown.MarkdownBody
+
+final class EmailBackend[F[_]: Sync](
+    channel: NotificationChannel.Email,
+    mailService: Emil[F],
+    logger: Logger[F]
+) extends NotificationBackend[F] {
+
+  import emil.builder._
+
+  def send(event: EventContext): F[Unit] = {
+    val mail =
+      MailBuilder.build(
+        From(channel.from),
+        Tos(channel.recipients.toList),
+        Subject(event.defaultTitle),
+        MarkdownBody[F](event.defaultBody)
+      )
+
+    logger.debug(s"Attempting to send notification mail: $channel") *>
+      mailService(channel.config)
+        .send(mail)
+        .flatMap(msgId => logger.info(s"Send notification mail ${msgId.head}"))
+  }
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/EventNotify.scala

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl
+
+import cats.data.Kleisli
+import cats.data.OptionT
+import cats.effect._
+
+import docspell.common.Logger
+import docspell.notification.api.Event
+import docspell.notification.api.NotificationBackend
+import docspell.store.Store
+import docspell.store.queries.QNotification
+
+import emil.Emil
+import org.http4s.client.Client
+
+/** Represents the actual work done for each event. */
+object EventNotify {
+  private[this] val log4sLogger = org.log4s.getLogger
+
+  def apply[F[_]: Async](
+      store: Store[F],
+      mailService: Emil[F],
+      client: Client[F]
+  ): Kleisli[F, Event, Unit] =
+    Kleisli { event =>
+      (for {
+        hooks <- OptionT.liftF(store.transact(QNotification.findChannelsForEvent(event)))
+        evctx <- DbEventContext.apply.run(event).mapK(store.transform)
+        channels = hooks
+          .filter(hc =>
+            hc.channels.nonEmpty && hc.hook.eventFilter.forall(_.matches(evctx.asJson))
+          )
+          .flatMap(_.channels)
+        backend =
+          if (channels.isEmpty) NotificationBackend.silent[F]
+          else
+            NotificationBackendImpl.forChannelsIgnoreErrors(
+              client,
+              mailService,
+              Logger.log4s(log4sLogger)
+            )(channels)
+        _ <- OptionT.liftF(backend.send(evctx))
+      } yield ()).getOrElse(())
+    }
+
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/ExampleEventContext.scala

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl
+
+import cats.data.Kleisli
+import cats.effect.kernel.Sync
+
+import docspell.notification.api.{Event, EventContext}
+import docspell.notification.impl.context._
+
+object ExampleEventContext {
+
+  type Factory[F[_]] = EventContext.Example[F, Event]
+
+  def apply[F[_]: Sync]: Factory[F] =
+    Kleisli {
+      case ev: Event.TagsChanged =>
+        TagsChangedCtx.sample.run(ev)
+
+      case ev: Event.SetFieldValue =>
+        SetFieldValueCtx.sample.run(ev)
+
+      case ev: Event.DeleteFieldValue =>
+        DeleteFieldValueCtx.sample.run(ev)
+
+      case ev: Event.ItemSelection =>
+        ItemSelectionCtx.sample.run(ev)
+
+      case ev: Event.JobSubmitted =>
+        JobSubmittedCtx.sample.run(ev)
+
+      case ev: Event.JobDone =>
+        JobDoneCtx.sample.run(ev)
+    }
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/GotifyBackend.scala

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl
+
+import cats.effect._
+import cats.implicits._
+
+import docspell.common.Logger
+import docspell.notification.api._
+
+import io.circe.Json
+import org.http4s.Uri
+import org.http4s.circe.CirceEntityCodec._
+import org.http4s.client.Client
+import org.http4s.client.dsl.Http4sClientDsl
+import org.http4s.dsl.Http4sDsl
+
+final class GotifyBackend[F[_]: Async](
+    channel: NotificationChannel.Gotify,
+    client: Client[F],
+    logger: Logger[F]
+) extends NotificationBackend[F] {
+
+  val dsl = new Http4sDsl[F] with Http4sClientDsl[F] {}
+  import dsl._
+
+  def send(event: EventContext): F[Unit] = {
+    val url = Uri.unsafeFromString((channel.url / "message").asString)
+    val req = POST(
+      Json.obj(
+        "title" -> Json.fromString(event.defaultTitle),
+        "message" -> Json.fromString(event.defaultBody),
+        "extras" -> Json.obj(
+          "client::display" -> Json.obj(
+            "contentType" -> Json.fromString("text/markdown")
+          )
+        )
+      ),
+      url
+    )
+      .putHeaders("X-Gotify-Key" -> channel.appKey.pass)
+    logger.debug(s"Seding request: $req") *>
+      HttpSend.sendRequest(client, req, channel, logger)
+  }
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/HttpPostBackend.scala

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl
+
+import cats.effect._
+import cats.implicits._
+
+import docspell.common.Logger
+import docspell.notification.api._
+
+import org.http4s.Uri
+import org.http4s.client.Client
+import org.http4s.client.dsl.Http4sClientDsl
+import org.http4s.dsl.Http4sDsl
+
+final class HttpPostBackend[F[_]: Async](
+    channel: NotificationChannel.HttpPost,
+    client: Client[F],
+    logger: Logger[F]
+) extends NotificationBackend[F] {
+
+  val dsl = new Http4sDsl[F] with Http4sClientDsl[F] {}
+  import dsl._
+  import org.http4s.circe.CirceEntityCodec._
+
+  def send(event: EventContext): F[Unit] = {
+    val url = Uri.unsafeFromString(channel.url.asString)
+    val req = POST(event.asJsonWithMessage, url).putHeaders(channel.headers.toList)
+    logger.debug(s"$channel sending request: $req") *>
+      HttpSend.sendRequest(client, req, channel, logger)
+  }
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/HttpSend.scala

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl
+
+import cats.effect._
+import cats.implicits._
+
+import docspell.common._
+import docspell.notification.api.NotificationChannel
+
+import org.http4s.Request
+import org.http4s.client.Client
+
+object HttpSend {
+
+  def sendRequest[F[_]: Async](
+      client: Client[F],
+      req: Request[F],
+      channel: NotificationChannel,
+      logger: Logger[F]
+  ) =
+    client
+      .status(req)
+      .flatMap { status =>
+        if (status.isSuccess) logger.info(s"Send notification via $channel")
+        else
+          Async[F].raiseError[Unit](
+            new Exception(s"Error sending notification via $channel: $status")
+          )
+      }
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/Markdown.scala

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl
+
+import java.util
+
+import com.vladsch.flexmark.ext.gfm.strikethrough.StrikethroughExtension
+import com.vladsch.flexmark.ext.tables.TablesExtension
+import com.vladsch.flexmark.html.HtmlRenderer
+import com.vladsch.flexmark.parser.Parser
+import com.vladsch.flexmark.util.data.{DataKey, MutableDataSet}
+
+object Markdown {
+
+  def toHtml(md: String): String = {
+    val p = createParser()
+    val r = createRenderer()
+    val doc = p.parse(md)
+    r.render(doc).trim
+  }
+
+  private def createParser(): Parser = {
+    val opts = new MutableDataSet()
+    opts.set(
+      Parser.EXTENSIONS.asInstanceOf[DataKey[util.Collection[_]]],
+      util.Arrays.asList(TablesExtension.create(), StrikethroughExtension.create())
+    );
+
+    Parser.builder(opts).build()
+  }
+
+  private def createRenderer(): HtmlRenderer = {
+    val opts = new MutableDataSet()
+    HtmlRenderer.builder(opts).build()
+  }
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/MatrixBackend.scala

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl
+
+import cats.effect._
+
+import docspell.common.Logger
+import docspell.notification.api._
+
+import org.http4s.Uri
+import org.http4s.client.Client
+import org.http4s.client.dsl.Http4sClientDsl
+import org.http4s.dsl.Http4sDsl
+
+final class MatrixBackend[F[_]: Async](
+    channel: NotificationChannel.Matrix,
+    client: Client[F],
+    logger: Logger[F]
+) extends NotificationBackend[F] {
+
+  val dsl = new Http4sDsl[F] with Http4sClientDsl[F] {}
+  import dsl._
+  import org.http4s.circe.CirceEntityCodec._
+
+  def send(event: EventContext): F[Unit] = {
+    val url =
+      (channel.homeServer / "_matrix" / "client" / "r0" / "rooms" / channel.roomId / "send" / "m.room.message")
+        .withQuery("access_token", channel.accessToken.pass)
+    val uri = Uri.unsafeFromString(url.asString)
+    val req = POST(
+      Map(
+        "msgtype" -> channel.messageType,
+        "format" -> "org.matrix.custom.html",
+        "formatted_body" -> event.defaultBothHtml,
+        "body" -> event.defaultBoth
+      ),
+      uri
+    )
+    HttpSend.sendRequest(client, req, channel, logger)
+  }
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/NotificationBackendImpl.scala

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl
+
+import cats.data.NonEmptyList
+import cats.effect._
+
+import docspell.common.Logger
+import docspell.notification.api.NotificationBackend.{combineAll, ignoreErrors, silent}
+import docspell.notification.api.{NotificationBackend, NotificationChannel}
+
+import emil.Emil
+import org.http4s.client.Client
+
+object NotificationBackendImpl {
+
+  def forChannel[F[_]: Async](client: Client[F], mailService: Emil[F], logger: Logger[F])(
+      channel: NotificationChannel
+  ): NotificationBackend[F] =
+    channel match {
+      case c: NotificationChannel.Email =>
+        new EmailBackend[F](c, mailService, logger)
+      case c: NotificationChannel.HttpPost =>
+        new HttpPostBackend[F](c, client, logger)
+      case c: NotificationChannel.Gotify =>
+        new GotifyBackend[F](c, client, logger)
+      case c: NotificationChannel.Matrix =>
+        new MatrixBackend[F](c, client, logger)
+    }
+
+  def forChannels[F[_]: Async](client: Client[F], maiService: Emil[F], logger: Logger[F])(
+      channels: Seq[NotificationChannel]
+  ): NotificationBackend[F] =
+    NonEmptyList.fromFoldable(channels) match {
+      case Some(nel) =>
+        combineAll[F](nel.map(forChannel(client, maiService, logger)))
+      case None =>
+        silent[F]
+    }
+
+  def forChannelsIgnoreErrors[F[_]: Async](
+      client: Client[F],
+      mailService: Emil[F],
+      logger: Logger[F]
+  )(
+      channels: Seq[NotificationChannel]
+  ): NotificationBackend[F] =
+    NonEmptyList.fromFoldable(channels) match {
+      case Some(nel) =>
+        combineAll(
+          nel.map(forChannel[F](client, mailService, logger)).map(ignoreErrors[F](logger))
+        )
+      case None =>
+        silent[F]
+    }
+
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/NotificationModuleImpl.scala

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl
+
+import cats.data.Kleisli
+import cats.effect.kernel.Async
+import cats.implicits._
+
+import docspell.common._
+import docspell.notification.api._
+import docspell.store.Store
+
+import emil.Emil
+import org.http4s.client.Client
+
+object NotificationModuleImpl {
+
+  def apply[F[_]: Async](
+      store: Store[F],
+      mailService: Emil[F],
+      client: Client[F],
+      queueSize: Int
+  ): F[NotificationModule[F]] =
+    for {
+      exchange <- EventExchange.circularQueue[F](queueSize)
+    } yield new NotificationModule[F] {
+      val notifyEvent = EventNotify(store, mailService, client)
+
+      val eventContext = DbEventContext.apply.mapF(_.mapK(store.transform))
+
+      val sampleEvent = ExampleEventContext.apply
+
+      def send(
+          logger: Logger[F],
+          event: EventContext,
+          channels: Seq[NotificationChannel]
+      ) =
+        NotificationBackendImpl
+          .forChannels(client, mailService, logger)(channels)
+          .send(event)
+
+      def offer(event: Event) = exchange.offer(event)
+
+      def consume(maxConcurrent: Int)(run: Kleisli[F, Event, Unit]) =
+        exchange.consume(maxConcurrent)(run)
+    }
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/context/BasicData.scala

@@ -0,0 +1,149 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl.context
+
+import cats.data.NonEmptyList
+import cats.effect.Sync
+import cats.implicits._
+
+import docspell.common._
+import docspell.query.ItemQuery
+import docspell.query.ItemQueryDsl
+import docspell.store.qb.Batch
+import docspell.store.queries.ListItem
+import docspell.store.queries.QItem
+import docspell.store.queries.Query
+import docspell.store.records._
+
+import doobie._
+import io.circe.Encoder
+import io.circe.generic.semiauto.deriveEncoder
+
+object BasicData {
+
+  final case class Tag(id: Ident, name: String, category: Option[String])
+  object Tag {
+    implicit val jsonEncoder: Encoder[Tag] = deriveEncoder
+
+    def apply(t: RTag): Tag = Tag(t.tagId, t.name, t.category)
+
+    def sample[F[_]: Sync](id: String): F[Tag] =
+      Sync[F]
+        .delay(if (math.random() > 0.5) "Invoice" else "Receipt")
+        .map(tag => Tag(Ident.unsafe(id), tag, Some("doctype")))
+  }
+
+  final case class Item(
+      id: Ident,
+      name: String,
+      dateMillis: Timestamp,
+      date: String,
+      direction: Direction,
+      state: ItemState,
+      dueDateMillis: Option[Timestamp],
+      dueDate: Option[String],
+      source: String,
+      overDue: Boolean,
+      dueIn: Option[String],
+      corrOrg: Option[String],
+      notes: Option[String]
+  )
+
+  object Item {
+    implicit val jsonEncoder: Encoder[Item] = deriveEncoder
+
+    private def calcDueLabels(now: Timestamp, dueDate: Option[Timestamp]) = {
+      val dueIn = dueDate.map(dt => Timestamp.daysBetween(now, dt))
+      val dueInLabel = dueIn.map {
+        case 0          => "**today**"
+        case 1          => "**tomorrow**"
+        case -1         => s"**yesterday**"
+        case n if n > 0 => s"in $n days"
+        case n          => s"${n * -1} days ago"
+      }
+      (dueIn, dueInLabel)
+    }
+
+    def find(
+        itemIds: NonEmptyList[Ident],
+        account: AccountId,
+        now: Timestamp
+    ): ConnectionIO[Vector[Item]] = {
+      import ItemQueryDsl._
+
+      val q = Query(
+        Query.Fix(
+          account,
+          Some(ItemQuery.Attr.ItemId.in(itemIds.map(_.id))),
+          Some(_.created)
+        )
+      )
+      for {
+        items <- QItem
+          .findItems(q, now.toUtcDate, 25, Batch.limit(itemIds.size))
+          .compile
+          .to(Vector)
+      } yield items.map(apply(now))
+    }
+
+    def apply(now: Timestamp)(i: ListItem): Item = {
+      val (dueIn, dueInLabel) = calcDueLabels(now, i.dueDate)
+      Item(
+        i.id,
+        i.name,
+        i.date,
+        i.date.toUtcDate.toString,
+        i.direction,
+        i.state,
+        i.dueDate,
+        i.dueDate.map(_.toUtcDate.toString),
+        i.source,
+        dueIn.exists(_ < 0),
+        dueInLabel,
+        i.corrOrg.map(_.name),
+        i.notes
+      )
+    }
+
+    def sample[F[_]: Sync](id: Ident): F[Item] =
+      Timestamp.current[F].map { now =>
+        val dueDate = if (id.hashCode % 2 == 0) Some(now + Duration.days(3)) else None
+        val (dueIn, dueInLabel) = calcDueLabels(now, dueDate)
+        Item(
+          id,
+          "MapleSirupLtd_202331.pdf",
+          now - Duration.days(62),
+          (now - Duration.days(62)).toUtcDate.toString,
+          Direction.Incoming,
+          ItemState.Confirmed,
+          dueDate,
+          dueDate.map(_.toUtcDate.toString),
+          "webapp",
+          dueIn.exists(_ < 0),
+          dueInLabel,
+          Some("Acme AG"),
+          None
+        )
+      }
+  }
+
+  final case class Field(
+      id: Ident,
+      name: Ident,
+      label: Option[String],
+      ftype: CustomFieldType
+  )
+  object Field {
+    implicit val jsonEncoder: Encoder[Field] = deriveEncoder
+
+    def apply(r: RCustomField): Field =
+      Field(r.id, r.name, r.label, r.ftype)
+
+    def sample[F[_]: Sync](id: Ident): F[Field] =
+      Sync[F].delay(Field(id, Ident.unsafe("chf"), Some("CHF"), CustomFieldType.Money))
+  }
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/context/DeleteFieldValueCtx.scala

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl.context
+
+import cats.data.Kleisli
+import cats.data.OptionT
+import cats.effect.Sync
+import cats.implicits._
+
+import docspell.common._
+import docspell.notification.api.{Event, EventContext}
+import docspell.notification.impl.AbstractEventContext
+import docspell.notification.impl.context.BasicData._
+import docspell.notification.impl.context.Syntax._
+import docspell.store.records._
+
+import doobie._
+import io.circe.Encoder
+import io.circe.syntax._
+import yamusca.implicits._
+
+final case class DeleteFieldValueCtx(
+    event: Event.DeleteFieldValue,
+    data: DeleteFieldValueCtx.Data
+) extends AbstractEventContext {
+
+  val content = data.asJson
+
+  val titleTemplate = mustache"{{eventType}} (by *{{account.user}}*)"
+  val bodyTemplate =
+    mustache"""{{#content}}{{#field.label}}*{{field.label}}* {{/field.label}}{{^field.label}}*{{field.name}}* {{/field.label}} was removed from {{#items}}{{^-first}}, {{/-first}}{{#itemUrl}}[`{{name}}`]({{{itemUrl}}}/{{{id}}}){{/itemUrl}}{{^itemUrl}}`{{name}}`{{/itemUrl}}{{/items}}.{{/content}}"""
+
+}
+
+object DeleteFieldValueCtx {
+  type Factory = EventContext.Factory[ConnectionIO, Event.DeleteFieldValue]
+
+  def apply: Factory =
+    Kleisli(ev =>
+      for {
+        now <- OptionT.liftF(Timestamp.current[ConnectionIO])
+        items <- OptionT.liftF(Item.find(ev.items, ev.account, now))
+        field <- OptionT(RCustomField.findById(ev.field, ev.account.collective))
+        msg = DeleteFieldValueCtx(
+          ev,
+          Data(
+            ev.account,
+            items.toList,
+            Field(field),
+            ev.itemUrl
+          )
+        )
+      } yield msg
+    )
+
+  def sample[F[_]: Sync]: EventContext.Example[F, Event.DeleteFieldValue] =
+    EventContext.example(ev =>
+      for {
+        items <- ev.items.traverse(Item.sample[F])
+        field <- Field.sample[F](ev.field)
+      } yield DeleteFieldValueCtx(
+        ev,
+        Data(ev.account, items.toList, field, ev.itemUrl)
+      )
+    )
+
+  final case class Data(
+      account: AccountId,
+      items: List[Item],
+      field: Field,
+      itemUrl: Option[String]
+  )
+
+  object Data {
+    implicit val jsonEncoder: Encoder[Data] =
+      io.circe.generic.semiauto.deriveEncoder
+  }
+
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/context/ItemSelectionCtx.scala

@@ -0,0 +1,117 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl.context
+
+import cats.effect._
+import cats.implicits._
+
+import docspell.common._
+import docspell.notification.api._
+import docspell.notification.impl.AbstractEventContext
+import docspell.notification.impl.context.Syntax._
+import docspell.store.queries.ListItem
+
+import doobie._
+import io.circe.Encoder
+import io.circe.syntax._
+import yamusca.implicits._
+
+final case class ItemSelectionCtx(event: Event.ItemSelection, data: ItemSelectionCtx.Data)
+    extends AbstractEventContext {
+
+  val content = data.asJson
+
+  val titleTemplate = mustache"Your items"
+  val bodyTemplate = mustache"""
+Hello {{{ content.username }}},
+
+this is Docspell informing you about your next items.
+
+{{#content}}
+{{#itemUrl}}
+{{#items}}
+- {{#overDue}}**(OVERDUE)** {{/overDue}}[{{name}}]({{itemUrl}}/{{id}}){{#dueDate}}, {{#overDue}}was {{/overDue}}due {{dueIn}} on *{{dueDate}}*{{/dueDate}}; {{#corrOrg}}from {{corrOrg}}{{/corrOrg}} received on {{date}} via {{source}}
+{{/items}}
+{{/itemUrl}}
+{{^itemUrl}}
+{{#items}}
+- {{#overDue}}**(OVERDUE)** {{/overDue}}*{{name}}*{{#dueDate}}, {{#overDue}}was {{/overDue}}due {{dueIn}} on *{{dueDate}}*{{/dueDate}}; {{#corrOrg}}from {{corrOrg}}{{/corrOrg}} received on {{date}} via {{source}}
+{{/items}}
+{{/itemUrl}}
+{{#more}}
+- … more have been left out for brevity
+{{/more}}
+{{/content}}
+
+
+Sincerely yours,
+
+Docspell
+"""
+}
+
+object ItemSelectionCtx {
+  import BasicData._
+
+  type Factory = EventContext.Factory[ConnectionIO, Event.ItemSelection]
+
+  def apply: Factory =
+    EventContext.factory(ev =>
+      for {
+        now <- Timestamp.current[ConnectionIO]
+        items <- Item.find(ev.items, ev.account, now)
+        msg = ItemSelectionCtx(
+          ev,
+          Data(
+            ev.account,
+            items.toList,
+            ev.itemUrl,
+            ev.more,
+            ev.account.user.id
+          )
+        )
+      } yield msg
+    )
+
+  def sample[F[_]: Sync]: EventContext.Example[F, Event.ItemSelection] =
+    EventContext.example(ev =>
+      for {
+        items <- ev.items.traverse(Item.sample[F])
+      } yield ItemSelectionCtx(
+        ev,
+        Data(ev.account, items.toList, ev.itemUrl, ev.more, ev.account.user.id)
+      )
+    )
+
+  final case class Data(
+      account: AccountId,
+      items: List[Item],
+      itemUrl: Option[String],
+      more: Boolean,
+      username: String
+  )
+  object Data {
+    implicit val jsonEncoder: Encoder[Data] =
+      io.circe.generic.semiauto.deriveEncoder
+
+    def create(
+        account: AccountId,
+        items: Vector[ListItem],
+        baseUrl: Option[LenientUri],
+        more: Boolean,
+        now: Timestamp
+    ): Data =
+      Data(
+        account,
+        items.map(Item(now)).toList,
+        baseUrl.map(_.asString),
+        more,
+        account.user.id
+      )
+  }
+
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/context/JobDoneCtx.scala

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl.context
+
+import cats.effect._
+
+import docspell.common._
+import docspell.notification.api._
+import docspell.notification.impl.AbstractEventContext
+
+import doobie._
+import io.circe.Encoder
+import io.circe.syntax._
+import yamusca.implicits._
+
+final case class JobDoneCtx(event: Event.JobDone, data: JobDoneCtx.Data)
+    extends AbstractEventContext {
+
+  val content = data.asJson
+
+  val titleTemplate = mustache"{{eventType}} (by *{{account.user}}*)"
+  val bodyTemplate = mustache"""{{#content}}_'{{subject}}'_ finished {{/content}}"""
+}
+
+object JobDoneCtx {
+
+  type Factory = EventContext.Factory[ConnectionIO, Event.JobDone]
+
+  def apply: Factory =
+    EventContext.pure(ev => JobDoneCtx(ev, Data(ev)))
+
+  def sample[F[_]: Sync]: EventContext.Example[F, Event.JobDone] =
+    EventContext.example(ev => Sync[F].pure(JobDoneCtx(ev, Data(ev))))
+
+  final case class Data(
+      job: Ident,
+      group: Ident,
+      task: Ident,
+      args: String,
+      state: JobState,
+      subject: String,
+      submitter: Ident
+  )
+  object Data {
+    implicit val jsonEncoder: Encoder[Data] =
+      io.circe.generic.semiauto.deriveEncoder
+
+    def apply(ev: Event.JobDone): Data =
+      Data(ev.jobId, ev.group, ev.task, ev.args, ev.state, ev.subject, ev.submitter)
+  }
+
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/context/JobSubmittedCtx.scala

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl.context
+
+import cats.effect._
+
+import docspell.common._
+import docspell.notification.api._
+import docspell.notification.impl.AbstractEventContext
+
+import doobie._
+import io.circe.Encoder
+import io.circe.syntax._
+import yamusca.implicits._
+
+final case class JobSubmittedCtx(event: Event.JobSubmitted, data: JobSubmittedCtx.Data)
+    extends AbstractEventContext {
+
+  val content = data.asJson
+
+  val titleTemplate = mustache"{{eventType}} (by *{{account.user}}*)"
+  val bodyTemplate =
+    mustache"""{{#content}}_'{{subject}}'_ submitted by {{submitter}} {{/content}}"""
+}
+
+object JobSubmittedCtx {
+
+  type Factory = EventContext.Factory[ConnectionIO, Event.JobSubmitted]
+
+  def apply: Factory =
+    EventContext.pure(ev => JobSubmittedCtx(ev, Data(ev)))
+
+  def sample[F[_]: Sync]: EventContext.Example[F, Event.JobSubmitted] =
+    EventContext.example(ev => Sync[F].pure(JobSubmittedCtx(ev, Data(ev))))
+
+  final case class Data(
+      job: Ident,
+      group: Ident,
+      task: Ident,
+      args: String,
+      state: JobState,
+      subject: String,
+      submitter: Ident
+  )
+  object Data {
+    implicit val jsonEncoder: Encoder[Data] =
+      io.circe.generic.semiauto.deriveEncoder
+
+    def apply(ev: Event.JobSubmitted): Data =
+      Data(ev.jobId, ev.group, ev.task, ev.args, ev.state, ev.subject, ev.submitter)
+  }
+
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/context/SetFieldValueCtx.scala

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl.context
+
+import cats.data.Kleisli
+import cats.data.OptionT
+import cats.effect.Sync
+import cats.implicits._
+
+import docspell.common._
+import docspell.notification.api.{Event, EventContext}
+import docspell.notification.impl.AbstractEventContext
+import docspell.notification.impl.context.BasicData._
+import docspell.notification.impl.context.Syntax._
+import docspell.store.records._
+
+import doobie._
+import io.circe.Encoder
+import io.circe.syntax._
+import yamusca.implicits._
+
+final case class SetFieldValueCtx(event: Event.SetFieldValue, data: SetFieldValueCtx.Data)
+    extends AbstractEventContext {
+
+  val content = data.asJson
+
+  val titleTemplate = mustache"{{eventType}} (by *{{account.user}}*)"
+  val bodyTemplate =
+    mustache"""{{#content}}{{#field.label}}*{{field.label}}* {{/field.label}}{{^field.label}}*{{field.name}}* {{/field.label}} was set to '{{value}}' on {{#items}}{{^-first}}, {{/-first}}{{#itemUrl}}[`{{name}}`]({{{itemUrl}}}/{{{id}}}){{/itemUrl}}{{^itemUrl}}`{{name}}`{{/itemUrl}}{{/items}}.{{/content}}"""
+
+}
+
+object SetFieldValueCtx {
+  type Factory = EventContext.Factory[ConnectionIO, Event.SetFieldValue]
+
+  def apply: Factory =
+    Kleisli(ev =>
+      for {
+        now <- OptionT.liftF(Timestamp.current[ConnectionIO])
+        items <- OptionT.liftF(Item.find(ev.items, ev.account, now))
+        field <- OptionT(RCustomField.findById(ev.field, ev.account.collective))
+        msg = SetFieldValueCtx(
+          ev,
+          Data(
+            ev.account,
+            items.toList,
+            Field(field),
+            ev.value,
+            ev.itemUrl
+          )
+        )
+      } yield msg
+    )
+
+  def sample[F[_]: Sync]: EventContext.Example[F, Event.SetFieldValue] =
+    EventContext.example(ev =>
+      for {
+        items <- ev.items.traverse(Item.sample[F])
+        field <- Field.sample[F](ev.field)
+      } yield SetFieldValueCtx(
+        ev,
+        Data(ev.account, items.toList, field, ev.value, ev.itemUrl)
+      )
+    )
+
+  final case class Data(
+      account: AccountId,
+      items: List[Item],
+      field: Field,
+      value: String,
+      itemUrl: Option[String]
+  )
+
+  object Data {
+    implicit val jsonEncoder: Encoder[Data] =
+      io.circe.generic.semiauto.deriveEncoder
+  }
+
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/context/Syntax.scala

@@ -0,0 +1,18 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl.context
+
+import docspell.notification.api.Event
+
+object Syntax {
+
+  implicit final class EventOps(ev: Event) {
+
+    def itemUrl: Option[String] =
+      ev.baseUrl.map(_ / "app" / "item").map(_.asString)
+  }
+}

modules/notification/impl/src/main/scala/docspell/notification/impl/context/TagsChangedCtx.scala

@@ -0,0 +1,82 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl.context
+
+import cats.effect.Sync
+import cats.implicits._
+
+import docspell.common._
+import docspell.notification.api.{Event, EventContext}
+import docspell.notification.impl.AbstractEventContext
+import docspell.notification.impl.context.BasicData._
+import docspell.notification.impl.context.Syntax._
+import docspell.store.records._
+
+import doobie._
+import io.circe.Encoder
+import io.circe.syntax._
+import yamusca.implicits._
+
+final case class TagsChangedCtx(event: Event.TagsChanged, data: TagsChangedCtx.Data)
+    extends AbstractEventContext {
+
+  val content = data.asJson
+
+  val titleTemplate = mustache"{{eventType}} (by *{{account.user}}*)"
+  val bodyTemplate =
+    mustache"""{{#content}}{{#added}}{{#-first}}Adding {{/-first}}{{^-first}}, {{/-first}}*{{name}}*{{/added}}{{#removed}}{{#added}}{{#-first}};{{/-first}}{{/added}}{{#-first}} Removing {{/-first}}{{^-first}}, {{/-first}}*{{name}}*{{/removed}} on {{#items}}{{^-first}}, {{/-first}}{{#itemUrl}}[`{{name}}`]({{{itemUrl}}}/{{{id}}}){{/itemUrl}}{{^itemUrl}}`{{name}}`{{/itemUrl}}{{/items}}.{{/content}}"""
+
+}
+
+object TagsChangedCtx {
+  type Factory = EventContext.Factory[ConnectionIO, Event.TagsChanged]
+
+  def apply: Factory =
+    EventContext.factory(ev =>
+      for {
+        tagsAdded <- RTag.findAllByNameOrId(ev.added, ev.account.collective)
+        tagsRemov <- RTag.findAllByNameOrId(ev.removed, ev.account.collective)
+        now <- Timestamp.current[ConnectionIO]
+        items <- Item.find(ev.items, ev.account, now)
+        msg = TagsChangedCtx(
+          ev,
+          Data(
+            ev.account,
+            items.toList,
+            tagsAdded.map(Tag.apply).toList,
+            tagsRemov.map(Tag.apply).toList,
+            ev.itemUrl
+          )
+        )
+      } yield msg
+    )
+
+  def sample[F[_]: Sync]: EventContext.Example[F, Event.TagsChanged] =
+    EventContext.example(ev =>
+      for {
+        items <- ev.items.traverse(Item.sample[F])
+        added <- ev.added.traverse(Tag.sample[F])
+        remov <- ev.removed.traverse(Tag.sample[F])
+      } yield TagsChangedCtx(
+        ev,
+        Data(ev.account, items.toList, added, remov, ev.itemUrl)
+      )
+    )
+
+  final case class Data(
+      account: AccountId,
+      items: List[Item],
+      added: List[Tag],
+      removed: List[Tag],
+      itemUrl: Option[String]
+  )
+
+  object Data {
+    implicit val jsonEncoder: Encoder[Data] =
+      io.circe.generic.semiauto.deriveEncoder
+  }
+}

modules/notification/impl/src/test/scala/docspell/notification/impl/context/TagsChangedCtxTest.scala

@@ -0,0 +1,75 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.notification.impl.context
+
+import cats.data.{NonEmptyList => Nel}
+import cats.implicits._
+
+import docspell.common._
+import docspell.notification.api.Event
+import docspell.notification.impl.context.BasicData._
+
+import munit._
+
+class TagsChangedCtxTest extends FunSuite {
+
+  val url = LenientUri.unsafe("http://test")
+  val account = AccountId(id("user2"), id("user2"))
+  val tag = Tag(id("a-b-1"), "tag-red", Some("doctype"))
+  val item = Item(
+    id = id("item-1"),
+    name = "Report 2",
+    dateMillis = Timestamp.Epoch,
+    date = "2020-11-11",
+    direction = Direction.Incoming,
+    state = ItemState.created,
+    dueDateMillis = None,
+    dueDate = None,
+    source = "webapp",
+    overDue = false,
+    dueIn = None,
+    corrOrg = Some("Acme"),
+    notes = None
+  )
+
+  def id(str: String): Ident = Ident.unsafe(str)
+
+  test("create tags changed message") {
+    val event =
+      Event.TagsChanged(account, Nel.of(id("item1")), List("tag-id"), Nil, url.some)
+    val ctx = TagsChangedCtx(
+      event,
+      TagsChangedCtx.Data(account, List(item), List(tag), Nil, url.some.map(_.asString))
+    )
+
+    assertEquals(ctx.defaultTitle, "TagsChanged (by *user2*)")
+    assertEquals(
+      ctx.defaultBody,
+      "Adding *tag-red* on [`Report 2`](http://test/item-1)."
+    )
+  }
+  test("create tags changed message") {
+    val event = Event.TagsChanged(account, Nel.of(id("item1")), Nil, Nil, url.some)
+    val ctx = TagsChangedCtx(
+      event,
+      TagsChangedCtx.Data(
+        account,
+        List(item),
+        List(tag),
+        List(tag.copy(name = "tag-blue")),
+        url.asString.some
+      )
+    )
+
+    assertEquals(ctx.defaultTitle, "TagsChanged (by *user2*)")
+    assertEquals(
+      ctx.defaultBody,
+      "Adding *tag-red*; Removing *tag-blue* on [`Report 2`](http://test/item-1)."
+    )
+  }
+
+}

modules/restapi/src/main/scala/docspell/restapi/codec/ChannelEihterCodec.scala

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.restapi.codec
+
+import docspell.notification.api.ChannelRef
+import docspell.restapi.model._
+
+import io.circe.syntax._
+import io.circe.{Decoder, Encoder}
+
+trait ChannelEitherCodec {
+
+  implicit val channelDecoder: Decoder[Either[ChannelRef, NotificationChannel]] =
+    NotificationChannel.jsonDecoder.either(ChannelRef.jsonDecoder).map(_.swap)
+
+  implicit val channelEncoder: Encoder[Either[ChannelRef, NotificationChannel]] =
+    Encoder.instance(_.fold(_.asJson, _.asJson))
+
+}
+
+object ChannelEitherCodec extends ChannelEitherCodec

modules/restapi/src/main/scala/docspell/restapi/model/NotificationChannel.scala

@@ -0,0 +1,130 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.restapi.model
+
+import cats.data.NonEmptyList
+import cats.implicits._
+
+import docspell.notification.api.Channel
+import docspell.notification.api.ChannelType
+import docspell.restapi.model._
+
+import emil.MailAddress
+import emil.javamail.syntax._
+import io.circe.{Decoder, Encoder}
+
+sealed trait NotificationChannel {
+  def fold[A](
+      f1: NotificationMail => A,
+      f2: NotificationGotify => A,
+      f3: NotificationMatrix => A,
+      f4: NotificationHttp => A
+  ): A
+}
+
+object NotificationChannel {
+  final case class Mail(c: NotificationMail) extends NotificationChannel {
+    def fold[A](
+        f1: NotificationMail => A,
+        f2: NotificationGotify => A,
+        f3: NotificationMatrix => A,
+        f4: NotificationHttp => A
+    ): A = f1(c)
+  }
+  final case class Gotify(c: NotificationGotify) extends NotificationChannel {
+    def fold[A](
+        f1: NotificationMail => A,
+        f2: NotificationGotify => A,
+        f3: NotificationMatrix => A,
+        f4: NotificationHttp => A
+    ): A = f2(c)
+  }
+  final case class Matrix(c: NotificationMatrix) extends NotificationChannel {
+    def fold[A](
+        f1: NotificationMail => A,
+        f2: NotificationGotify => A,
+        f3: NotificationMatrix => A,
+        f4: NotificationHttp => A
+    ): A = f3(c)
+  }
+  final case class Http(c: NotificationHttp) extends NotificationChannel {
+    def fold[A](
+        f1: NotificationMail => A,
+        f2: NotificationGotify => A,
+        f3: NotificationMatrix => A,
+        f4: NotificationHttp => A
+    ): A = f4(c)
+  }
+
+  def mail(c: NotificationMail): NotificationChannel = Mail(c)
+  def gotify(c: NotificationGotify): NotificationChannel = Gotify(c)
+  def matrix(c: NotificationMatrix): NotificationChannel = Matrix(c)
+  def http(c: NotificationHttp): NotificationChannel = Http(c)
+
+  def convert(c: NotificationChannel): Either[Throwable, Channel] =
+    c.fold(
+      mail =>
+        mail.recipients
+          .traverse(MailAddress.parse)
+          .map(NonEmptyList.fromList)
+          .flatMap(_.toRight("No recipients given!"))
+          .leftMap(new IllegalArgumentException(_))
+          .map(rec => Channel.Mail(mail.id, mail.connection, rec)),
+      gotify => Right(Channel.Gotify(gotify.id, gotify.url, gotify.appKey)),
+      matrix =>
+        Right(
+          Channel
+            .Matrix(matrix.id, matrix.homeServer, matrix.roomId, matrix.accessToken)
+        ),
+      http => Right(Channel.Http(http.id, http.url))
+    )
+
+  def convert(c: Channel): NotificationChannel =
+    c.fold(
+      m =>
+        mail {
+          NotificationMail(
+            m.id,
+            ChannelType.Mail,
+            m.connection,
+            m.recipients.toList.map(_.displayString)
+          )
+        },
+      g => gotify(NotificationGotify(g.id, ChannelType.Gotify, g.url, g.appKey)),
+      m =>
+        matrix(
+          NotificationMatrix(
+            m.id,
+            ChannelType.Matrix,
+            m.homeServer,
+            m.roomId,
+            m.accessToken
+          )
+        ),
+      h => http(NotificationHttp(h.id, ChannelType.Http, h.url))
+    )
+
+  implicit val jsonDecoder: Decoder[NotificationChannel] =
+    ChannelType.jsonDecoder.at("channelType").flatMap {
+      case ChannelType.Mail   => Decoder[NotificationMail].map(mail)
+      case ChannelType.Gotify => Decoder[NotificationGotify].map(gotify)
+      case ChannelType.Matrix => Decoder[NotificationMatrix].map(matrix)
+      case ChannelType.Http   => Decoder[NotificationHttp].map(http)
+    }
+
+  implicit val jsonEncoder: Encoder[NotificationChannel] =
+    Encoder.instance {
+      case NotificationChannel.Mail(c) =>
+        Encoder[NotificationMail].apply(c)
+      case NotificationChannel.Gotify(c) =>
+        Encoder[NotificationGotify].apply(c)
+      case NotificationChannel.Matrix(c) =>
+        Encoder[NotificationMatrix].apply(c)
+      case NotificationChannel.Http(c) =>
+        Encoder[NotificationHttp].apply(c)
+    }
+}

modules/restapi/src/main/scala/docspell/restapi/model/NotificationHook.scala

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.restapi.model
+
+import docspell.common._
+import docspell.jsonminiq.JsonMiniQuery
+import docspell.notification.api.{ChannelRef, EventType}
+import docspell.restapi.codec.ChannelEitherCodec
+
+import io.circe.{Decoder, Encoder}
+
+// this must comply to the definition in openapi.yml in `extraSchemas`
+final case class NotificationHook(
+    id: Ident,
+    enabled: Boolean,
+    channel: Either[ChannelRef, NotificationChannel],
+    allEvents: Boolean,
+    eventFilter: Option[JsonMiniQuery],
+    events: List[EventType]
+)
+
+object NotificationHook {
+  import ChannelEitherCodec._
+
+  implicit val jsonDecoder: Decoder[NotificationHook] =
+    io.circe.generic.semiauto.deriveDecoder
+  implicit val jsonEncoder: Encoder[NotificationHook] =
+    io.circe.generic.semiauto.deriveEncoder
+}

modules/restapi/src/main/scala/docspell/restapi/model/PeriodicDueItemsSettings.scala

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.restapi.model
+
+import docspell.common._
+import docspell.restapi.model._
+
+import com.github.eikek.calev.CalEvent
+import com.github.eikek.calev.circe.CalevCirceCodec._
+import io.circe.generic.semiauto
+import io.circe.{Decoder, Encoder}
+
+// this must comply to the definition in openapi.yml in `extraSchemas`
+final case class PeriodicDueItemsSettings(
+    id: Ident,
+    enabled: Boolean,
+    summary: Option[String],
+    channel: NotificationChannel,
+    schedule: CalEvent,
+    remindDays: Int,
+    capOverdue: Boolean,
+    tagsInclude: List[Tag],
+    tagsExclude: List[Tag]
+)
+object PeriodicDueItemsSettings {
+
+  implicit val jsonDecoder: Decoder[PeriodicDueItemsSettings] =
+    semiauto.deriveDecoder[PeriodicDueItemsSettings]
+  implicit val jsonEncoder: Encoder[PeriodicDueItemsSettings] =
+    semiauto.deriveEncoder[PeriodicDueItemsSettings]
+}

modules/restapi/src/main/scala/docspell/restapi/model/PeriodicQuerySettings.scala

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.restapi.model
+
+import docspell.common._
+import docspell.query.ItemQuery
+import docspell.restapi.codec.ItemQueryJson._
+
+import com.github.eikek.calev.CalEvent
+import com.github.eikek.calev.circe.CalevCirceCodec._
+import io.circe.generic.semiauto
+import io.circe.{Decoder, Encoder}
+
+// this must comply to the definition in openapi.yml in `extraSchemas`
+final case class PeriodicQuerySettings(
+    id: Ident,
+    summary: Option[String],
+    enabled: Boolean,
+    channel: NotificationChannel,
+    query: ItemQuery,
+    schedule: CalEvent
+) {}
+
+object PeriodicQuerySettings {
+
+  implicit val jsonDecoder: Decoder[PeriodicQuerySettings] =
+    semiauto.deriveDecoder
+
+  implicit val jsonEncoder: Encoder[PeriodicQuerySettings] =
+    semiauto.deriveEncoder
+}

modules/restapi/src/test/scala/docspell/restapi/model/NotificationCodecTest.scala

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.restapi.model
+
+import docspell.common._
+import docspell.notification.api.ChannelRef
+import docspell.notification.api.ChannelType
+
+import io.circe.Decoder
+import io.circe.parser
+import munit._
+
+class NotificationCodecTest extends FunSuite {
+
+  def parse[A: Decoder](str: String): A =
+    parser.parse(str).fold(throw _, identity).as[A].fold(throw _, identity)
+
+  def id(str: String): Ident =
+    Ident.unsafe(str)
+
+  test("decode with channelref") {
+    val json = """{"id":"",
+ "enabled": true,
+ "channel": {"id":"abcde", "channelType":"matrix"},
+ "allEvents": false,
+ "events": ["TagsChanged", "SetFieldValue"]
+}"""
+
+    val hook = parse[NotificationHook](json)
+    assertEquals(hook.enabled, true)
+    assertEquals(hook.channel, Left(ChannelRef(id("abcde"), ChannelType.Matrix)))
+  }
+
+  test("decode with gotify data") {
+    val json = """{"id":"",
+ "enabled": true,
+ "channel": {"id":"", "channelType":"gotify", "url":"http://test.gotify.com", "appKey": "abcde"},
+ "allEvents": false,
+ "eventFilter": null,
+ "events": ["TagsChanged", "SetFieldValue"]
+}"""
+    val hook = parse[NotificationHook](json)
+    assertEquals(hook.enabled, true)
+    assertEquals(
+      hook.channel,
+      Right(
+        NotificationChannel.Gotify(
+          NotificationGotify(
+            id(""),
+            ChannelType.Gotify,
+            LenientUri.unsafe("http://test.gotify.com"),
+            Password("abcde")
+          )
+        )
+      )
+    )
+  }
+}

modules/restserver/src/main/resources/logback.xml

@@ -9,7 +9,7 @@
 
   <logger name="docspell" level="debug" />
   <logger name="emil" level="debug"/>
-
+  <logger name="org.http4s.server.message-failures" level="debug"/>
   <root level="INFO">
     <appender-ref ref="STDOUT" />
   </root>

modules/restserver/src/main/scala/docspell/restserver/RestApp.scala

@@ -6,11 +6,23 @@
 
 package docspell.restserver
 
+import fs2.Stream
+
 import docspell.backend.BackendApp
 
 trait RestApp[F[_]] {
 
+  /** Access to the configuration used to build backend services. */
   def config: Config
 
+  /** Access to all backend services */
   def backend: BackendApp[F]
+
+  /** Stream consuming events (async) originating in this application. */
+  def eventConsume(maxConcurrent: Int): Stream[F, Nothing]
+
+  /** Stream consuming messages from topics (pubsub) and forwarding them to the frontend
+    * via websocket.
+    */
+  def subscriptions: Stream[F, Nothing]
 }

modules/restserver/src/main/scala/docspell/restserver/RestAppImpl.scala

@@ -7,18 +7,36 @@
 package docspell.restserver
 
 import cats.effect._
+import fs2.Stream
+import fs2.concurrent.Topic
 
 import docspell.backend.BackendApp
 import docspell.common.Logger
 import docspell.ftsclient.FtsClient
 import docspell.ftssolr.SolrFtsClient
+import docspell.notification.api.NotificationModule
+import docspell.notification.impl.NotificationModuleImpl
 import docspell.pubsub.api.{PubSub, PubSubT}
+import docspell.restserver.ws.OutputEvent
 import docspell.store.Store
 
+import emil.javamail.JavaMailEmil
 import org.http4s.client.Client
 
-final class RestAppImpl[F[_]](val config: Config, val backend: BackendApp[F])
+final class RestAppImpl[F[_]: Async](
-    extends RestApp[F] {}
+    val config: Config,
+    val backend: BackendApp[F],
+    notificationMod: NotificationModule[F],
+    wsTopic: Topic[F, OutputEvent],
+    pubSub: PubSubT[F]
+) extends RestApp[F] {
+
+  def eventConsume(maxConcurrent: Int): Stream[F, Nothing] =
+    notificationMod.consumeAllEvents(maxConcurrent)
+
+  def subscriptions: Stream[F, Nothing] =
+    Subscriptions[F](wsTopic, pubSub)
+}
 
 object RestAppImpl {
 
@@ -26,14 +44,21 @@ object RestAppImpl {
       cfg: Config,
       store: Store[F],
       httpClient: Client[F],
-      pubSub: PubSub[F]
+      pubSub: PubSub[F],
+      wsTopic: Topic[F, OutputEvent]
   ): Resource[F, RestApp[F]] = {
     val logger = Logger.log4s(org.log4s.getLogger(s"restserver-${cfg.appId.id}"))
     for {
       ftsClient <- createFtsClient(cfg)(httpClient)
       pubSubT = PubSubT(pubSub, logger)
-      backend <- BackendApp.create[F](cfg.backend, store, ftsClient, pubSubT)
+      javaEmil = JavaMailEmil(cfg.backend.mailSettings)
-      app = new RestAppImpl[F](cfg, backend)
+      notificationMod <- Resource.eval(
+        NotificationModuleImpl[F](store, javaEmil, httpClient, 200)
+      )
+      backend <- BackendApp
+        .create[F](store, javaEmil, ftsClient, pubSubT, notificationMod)
+
+      app = new RestAppImpl[F](cfg, backend, notificationMod, wsTopic, pubSubT)
     } yield app
   }
 

modules/restserver/src/main/scala/docspell/restserver/RestServer.scala

@@ -50,10 +50,11 @@ object RestServer {
 
       server =
         Stream
-          .resource(createApp(cfg, pools))
+          .resource(createApp(cfg, pools, wsTopic))
           .flatMap { case (restApp, pubSub, httpClient, setting) =>
             Stream(
-              Subscriptions(wsTopic, restApp.backend.pubSub),
+              restApp.subscriptions,
+              restApp.eventConsume(2),
               BlazeServerBuilder[F]
                 .bindHttp(cfg.bind.port, cfg.bind.address)
                 .withoutBanner
@@ -71,8 +72,12 @@ object RestServer {
 
   def createApp[F[_]: Async](
       cfg: Config,
-      pools: Pools
+      pools: Pools,
-  ): Resource[F, (RestApp[F], NaivePubSub[F], Client[F], RInternalSetting)] =
+      wsTopic: Topic[F, OutputEvent]
+  ): Resource[
+    F,
+    (RestApp[F], NaivePubSub[F], Client[F], RInternalSetting)
+  ] =
     for {
       httpClient <- BlazeClientBuilder[F].resource
       store <- Store.create[F](
@@ -86,7 +91,7 @@ object RestServer {
         store,
         httpClient
       )(Topics.all.map(_.topic))
-      restApp <- RestAppImpl.create[F](cfg, store, httpClient, pubSub)
+      restApp <- RestAppImpl.create[F](cfg, store, httpClient, pubSub, wsTopic)
     } yield (restApp, pubSub, httpClient, setting)
 
   def createHttpApp[F[_]: Async](
@@ -150,7 +155,7 @@ object RestServer {
       "collective" -> CollectiveRoutes(restApp.backend, token),
       "queue" -> JobQueueRoutes(restApp.backend, token),
       "item" -> ItemRoutes(cfg, restApp.backend, token),
-      "items" -> ItemMultiRoutes(restApp.backend, token),
+      "items" -> ItemMultiRoutes(cfg, restApp.backend, token),
       "attachment" -> AttachmentRoutes(restApp.backend, token),
       "attachments" -> AttachmentMultiRoutes(restApp.backend, token),
       "upload" -> UploadRoutes.secured(restApp.backend, cfg, token),
@@ -161,11 +166,13 @@ object RestServer {
       "share" -> ShareRoutes.manage(restApp.backend, token),
       "usertask/notifydueitems" -> NotifyDueItemsRoutes(cfg, restApp.backend, token),
       "usertask/scanmailbox" -> ScanMailboxRoutes(restApp.backend, token),
+      "usertask/periodicquery" -> PeriodicQueryRoutes(cfg, restApp.backend, token),
       "calevent/check" -> CalEventCheckRoutes(),
       "fts" -> FullTextIndexRoutes.secured(cfg, restApp.backend, token),
       "folder" -> FolderRoutes(restApp.backend, token),
       "customfield" -> CustomFieldRoutes(restApp.backend, token),
-      "clientSettings" -> ClientSettingsRoutes(restApp.backend, token)
+      "clientSettings" -> ClientSettingsRoutes(restApp.backend, token),
+      "notification" -> NotificationRoutes(cfg, restApp.backend, token)
     )
 
   def openRoutes[F[_]: Async](

modules/restserver/src/main/scala/docspell/restserver/routes/ItemMultiRoutes.scala

@@ -14,7 +14,9 @@ import docspell.backend.auth.AuthToken
 import docspell.backend.ops.OCustomFields.{RemoveValue, SetValue}
 import docspell.common._
 import docspell.restapi.model._
+import docspell.restserver.Config
 import docspell.restserver.conv.{Conversions, MultiIdSupport}
+import docspell.restserver.http4s.ClientRequestInfo
 
 import org.http4s.HttpRoutes
 import org.http4s.circe.CirceEntityDecoder._
@@ -26,6 +28,7 @@ object ItemMultiRoutes extends MultiIdSupport {
   private[this] val log4sLogger = getLogger
 
   def apply[F[_]: Async](
+      cfg: Config,
       backend: BackendApp[F],
       user: AuthToken
   ): HttpRoutes[F] = {
@@ -66,7 +69,9 @@ object ItemMultiRoutes extends MultiIdSupport {
             json.refs,
             user.account.collective
           )
-          resp <- Ok(Conversions.basicResult(res, "Tags updated"))
+          baseUrl = ClientRequestInfo.getBaseUrl(cfg, req)
+          _ <- backend.notification.offerEvents(res.event(user.account, baseUrl.some))
+          resp <- Ok(Conversions.basicResult(res.value, "Tags updated"))
         } yield resp
 
       case req @ POST -> Root / "tags" =>
@@ -78,7 +83,9 @@ object ItemMultiRoutes extends MultiIdSupport {
             json.refs,
             user.account.collective
           )
-          resp <- Ok(Conversions.basicResult(res, "Tags added."))
+          baseUrl = ClientRequestInfo.getBaseUrl(cfg, req)
+          _ <- backend.notification.offerEvents(res.event(user.account, baseUrl.some))
+          resp <- Ok(Conversions.basicResult(res.value, "Tags added."))
         } yield resp
 
       case req @ POST -> Root / "tagsremove" =>
@@ -90,7 +97,9 @@ object ItemMultiRoutes extends MultiIdSupport {
             json.refs,
             user.account.collective
           )
-          resp <- Ok(Conversions.basicResult(res, "Tags removed"))
+          baseUrl = ClientRequestInfo.getBaseUrl(cfg, req)
+          _ <- backend.notification.offerEvents(res.event(user.account, baseUrl.some))
+          resp <- Ok(Conversions.basicResult(res.value, "Tags removed"))
         } yield resp
 
       case req @ PUT -> Root / "name" =>
@@ -205,7 +214,9 @@ object ItemMultiRoutes extends MultiIdSupport {
             items,
             SetValue(json.field.field, json.field.value, user.account.collective)
           )
-          resp <- Ok(Conversions.basicResult(res))
+          baseUrl = ClientRequestInfo.getBaseUrl(cfg, req)
+          _ <- backend.notification.offerEvents(res.event(user.account, baseUrl.some))
+          resp <- Ok(Conversions.basicResult(res.value))
         } yield resp
 
       case req @ POST -> Root / "customfieldremove" =>
@@ -216,7 +227,9 @@ object ItemMultiRoutes extends MultiIdSupport {
           res <- backend.customFields.deleteValue(
             RemoveValue(field, items, user.account.collective)
           )
-          resp <- Ok(Conversions.basicResult(res, "Custom fields removed."))
+          baseUrl = ClientRequestInfo.getBaseUrl(cfg, req)
+          _ <- backend.notification.offerEvents(res.event(user.account, baseUrl.some))
+          resp <- Ok(Conversions.basicResult(res.value, "Custom fields removed."))
         } yield resp
 
       case req @ POST -> Root / "merge" =>

modules/restserver/src/main/scala/docspell/restserver/routes/ItemRoutes.scala

@@ -25,6 +25,7 @@ import docspell.restapi.model._
 import docspell.restserver.Config
 import docspell.restserver.conv.Conversions
 import docspell.restserver.http4s.BinaryUtil
+import docspell.restserver.http4s.ClientRequestInfo
 import docspell.restserver.http4s.Responses
 import docspell.restserver.http4s.{QueryParam => QP}
 
@@ -160,29 +161,37 @@ object ItemRoutes {
         for {
           tags <- req.as[StringList].map(_.items)
           res <- backend.item.setTags(id, tags, user.account.collective)
-          resp <- Ok(Conversions.basicResult(res, "Tags updated"))
+          baseUrl = ClientRequestInfo.getBaseUrl(cfg, req)
+          _ <- backend.notification.offerEvents(res.event(user.account, baseUrl.some))
+          resp <- Ok(Conversions.basicResult(res.value, "Tags updated"))
         } yield resp
 
       case req @ POST -> Root / Ident(id) / "tags" =>
         for {
           data <- req.as[Tag]
           rtag <- Conversions.newTag(data, user.account.collective)
-          res <- backend.item.addNewTag(id, rtag)
+          res <- backend.item.addNewTag(user.account.collective, id, rtag)
-          resp <- Ok(Conversions.basicResult(res, "Tag added."))
+          baseUrl = ClientRequestInfo.getBaseUrl(cfg, req)
+          _ <- backend.notification.offerEvents(res.event(user.account, baseUrl.some))
+          resp <- Ok(Conversions.basicResult(res.value, "Tag added."))
         } yield resp
 
       case req @ PUT -> Root / Ident(id) / "taglink" =>
         for {
           tags <- req.as[StringList]
           res <- backend.item.linkTags(id, tags.items, user.account.collective)
-          resp <- Ok(Conversions.basicResult(res, "Tags linked"))
+          baseUrl = ClientRequestInfo.getBaseUrl(cfg, req)
+          _ <- backend.notification.offerEvents(res.event(user.account, baseUrl.some))
+          resp <- Ok(Conversions.basicResult(res.value, "Tags linked"))
         } yield resp
 
       case req @ POST -> Root / Ident(id) / "tagtoggle" =>
         for {
           tags <- req.as[StringList]
           res <- backend.item.toggleTags(id, tags.items, user.account.collective)
-          resp <- Ok(Conversions.basicResult(res, "Tags linked"))
+          baseUrl = ClientRequestInfo.getBaseUrl(cfg, req)
+          _ <- backend.notification.offerEvents(res.event(user.account, baseUrl.some))
+          resp <- Ok(Conversions.basicResult(res.value, "Tags linked"))
         } yield resp
 
       case req @ POST -> Root / Ident(id) / "tagsremove" =>
@@ -193,7 +202,9 @@ object ItemRoutes {
             json.items,
             user.account.collective
           )
-          resp <- Ok(Conversions.basicResult(res, "Tags removed"))
+          baseUrl = ClientRequestInfo.getBaseUrl(cfg, req)
+          _ <- backend.notification.offerEvents(res.event(user.account, baseUrl.some))
+          resp <- Ok(Conversions.basicResult(res.value, "Tags removed"))
         } yield resp
 
       case req @ PUT -> Root / Ident(id) / "direction" =>
@@ -392,15 +403,19 @@ object ItemRoutes {
             id,
             SetValue(data.field, data.value, user.account.collective)
           )
-          resp <- Ok(Conversions.basicResult(res))
+          baseUrl = ClientRequestInfo.getBaseUrl(cfg, req)
+          _ <- backend.notification.offerEvents(res.event(user.account, baseUrl.some))
+          resp <- Ok(Conversions.basicResult(res.value))
         } yield resp
 
-      case DELETE -> Root / Ident(id) / "customfield" / Ident(fieldId) =>
+      case req @ DELETE -> Root / Ident(id) / "customfield" / Ident(fieldId) =>
         for {
           res <- backend.customFields.deleteValue(
             RemoveValue(fieldId, NonEmptyList.of(id), user.account.collective)
           )
-          resp <- Ok(Conversions.basicResult(res, "Custom field value removed."))
+          baseUrl = ClientRequestInfo.getBaseUrl(cfg, req)
+          _ <- backend.notification.offerEvents(res.event(user.account, baseUrl.some))
+          resp <- Ok(Conversions.basicResult(res.value, "Custom field value removed."))
         } yield resp
 
       case DELETE -> Root / Ident(id) =>

modules/restserver/src/main/scala/docspell/restserver/routes/NotificationRoutes.scala

@@ -0,0 +1,207 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.restserver.routes
+
+import cats.effect._
+import cats.implicits._
+
+import docspell.backend.BackendApp
+import docspell.backend.auth.AuthToken
+import docspell.common._
+import docspell.joexapi.model.BasicResult
+import docspell.jsonminiq.JsonMiniQuery
+import docspell.notification.api.EventType
+import docspell.restapi.model._
+import docspell.restserver.Config
+import docspell.restserver.conv.Conversions
+import docspell.restserver.http4s.ClientRequestInfo
+
+import org.http4s._
+import org.http4s.circe.CirceEntityDecoder._
+import org.http4s.circe.CirceEntityEncoder._
+import org.http4s.dsl.Http4sDsl
+import org.http4s.server.Router
+
+object NotificationRoutes {
+
+  def apply[F[_]: Async](
+      cfg: Config,
+      backend: BackendApp[F],
+      user: AuthToken
+  ): HttpRoutes[F] =
+    Router(
+      "channel" -> channels(backend, user),
+      "hook" -> hooks(cfg, backend, user),
+      "event" -> events(cfg, backend, user)
+    )
+
+  def channels[F[_]: Async](
+      backend: BackendApp[F],
+      user: AuthToken
+  ): HttpRoutes[F] = {
+    val dsl = new Http4sDsl[F] {}
+    import dsl._
+
+    HttpRoutes.of {
+      case GET -> Root =>
+        for {
+          list <- backend.notification.listChannels(user.account)
+          data = list.map(NotificationChannel.convert)
+          resp <- Ok(data)
+        } yield resp
+
+      case DELETE -> Root / Ident(id) =>
+        for {
+          res <- backend.notification.deleteChannel(id, user.account)
+          resp <- Ok(Conversions.basicResult(res, "Channel deleted"))
+        } yield resp
+
+      case req @ POST -> Root =>
+        for {
+          input <- req.as[NotificationChannel]
+          ch <- Sync[F].pure(NotificationChannel.convert(input)).rethrow
+          res <- backend.notification.createChannel(ch, user.account)
+          resp <- Ok(Conversions.basicResult(res, "Channel created"))
+        } yield resp
+
+      case req @ PUT -> Root =>
+        for {
+          input <- req.as[NotificationChannel]
+          ch <- Sync[F].pure(NotificationChannel.convert(input)).rethrow
+          res <- backend.notification.updateChannel(ch, user.account)
+          resp <- Ok(Conversions.basicResult(res, "Channel created"))
+        } yield resp
+    }
+  }
+
+  def hooks[F[_]: Async](
+      cfg: Config,
+      backend: BackendApp[F],
+      user: AuthToken
+  ): HttpRoutes[F] = {
+    val dsl = new Http4sDsl[F] {}
+    import dsl._
+
+    HttpRoutes.of {
+      case GET -> Root =>
+        for {
+          list <- backend.notification.listHooks(user.account)
+          data = list.map(Converters.convertHook)
+          resp <- Ok(data)
+        } yield resp
+
+      case DELETE -> Root / Ident(id) =>
+        for {
+          res <- backend.notification.deleteHook(id, user.account)
+          resp <- Ok(Conversions.basicResult(res, "Hook deleted."))
+        } yield resp
+
+      case req @ POST -> Root =>
+        for {
+          input <- req.as[NotificationHook]
+          hook <- Sync[F].pure(Converters.convertHook(input)).rethrow
+          res <- backend.notification.createHook(hook, user.account)
+          resp <- Ok(Conversions.basicResult(res, "Hook created"))
+        } yield resp
+
+      case req @ PUT -> Root =>
+        for {
+          input <- req.as[NotificationHook]
+          hook <- Sync[F].pure(Converters.convertHook(input)).rethrow
+          res <- backend.notification.updateHook(hook, user.account)
+          resp <- Ok(Conversions.basicResult(res, "Hook updated"))
+        } yield resp
+
+      case req @ POST -> Root / "verifyJsonFilter" =>
+        for {
+          input <- req.as[StringValue]
+          res = JsonMiniQuery.parse(input.value)
+          resp <- Ok(BasicResult(res.isRight, res.fold(identity, _.unsafeAsString)))
+        } yield resp
+
+      case req @ POST -> Root / "sendTestEvent" =>
+        for {
+          input <- req.as[NotificationHook]
+          ch <- Sync[F]
+            .pure(
+              input.channel.left
+                .map(_ => new Exception(s"ChannelRefs not allowed for testing"))
+                .flatMap(NotificationChannel.convert)
+            )
+            .rethrow
+          baseUrl = ClientRequestInfo.getBaseUrl(cfg, req)
+          res <- backend.notification.sendSampleEvent(
+            input.events.headOption.getOrElse(EventType.all.head),
+            ch,
+            user.account,
+            baseUrl.some
+          )
+          resp <- Ok(NotificationChannelTestResult(res.success, res.logMessages.toList))
+        } yield resp
+    }
+  }
+
+  def events[F[_]: Async](
+      cfg: Config,
+      backend: BackendApp[F],
+      user: AuthToken
+  ): HttpRoutes[F] = {
+    val dsl = new Http4sDsl[F] {}
+    import dsl._
+
+    HttpRoutes.of { case req @ POST -> Root / "sample" =>
+      for {
+        input <- req.as[NotificationSampleEventReq]
+        baseUrl = ClientRequestInfo.getBaseUrl(cfg, req)
+        data <- backend.notification.sampleEvent(
+          input.eventType,
+          user.account,
+          baseUrl.some
+        )
+        resp <- Ok(data.asJsonWithMessage)
+      } yield resp
+    }
+  }
+
+  object Converters {
+
+    import docspell.backend.ops.ONotification
+
+    def convertHook(h: ONotification.Hook): NotificationHook =
+      NotificationHook(
+        h.id,
+        h.enabled,
+        h.channel.map(NotificationChannel.convert),
+        h.allEvents,
+        h.eventFilter,
+        h.events
+      )
+
+    def convertHook(h: NotificationHook): Either[Throwable, ONotification.Hook] =
+      h.channel match {
+        case Left(cref) =>
+          Right(
+            ONotification.Hook(
+              h.id,
+              h.enabled,
+              Left(cref),
+              h.allEvents,
+              h.eventFilter,
+              h.events
+            )
+          )
+        case Right(channel) =>
+          NotificationChannel
+            .convert(channel)
+            .map(ch =>
+              ONotification
+                .Hook(h.id, h.enabled, Right(ch), h.allEvents, h.eventFilter, h.events)
+            )
+      }
+
+  }
+}

modules/restserver/src/main/scala/docspell/restserver/routes/NotifyDueItemsRoutes.scala

@@ -11,8 +11,10 @@ import cats.effect._
 import cats.implicits._
 
 import docspell.backend.BackendApp
+import docspell.backend.MailAddressCodec
 import docspell.backend.auth.AuthToken
 import docspell.common._
+import docspell.notification.api.PeriodicDueItemsArgs
 import docspell.restapi.model._
 import docspell.restserver.Config
 import docspell.restserver.conv.Conversions
@@ -24,7 +26,7 @@ import org.http4s.circe.CirceEntityDecoder._
 import org.http4s.circe.CirceEntityEncoder._
 import org.http4s.dsl.Http4sDsl
 
-object NotifyDueItemsRoutes {
+object NotifyDueItemsRoutes extends MailAddressCodec {
 
   def apply[F[_]: Async](
       cfg: Config,
@@ -39,13 +41,13 @@ object NotifyDueItemsRoutes {
       case GET -> Root / Ident(id) =>
         (for {
           task <- ut.findNotifyDueItems(id, UserTaskScope(user.account))
-          res <- OptionT.liftF(taskToSettings(user.account, backend, task))
+          res <- OptionT.liftF(taskToSettings(backend, task))
           resp <- OptionT.liftF(Ok(res))
         } yield resp).getOrElseF(NotFound())
 
       case req @ POST -> Root / "startonce" =>
         for {
-          data <- req.as[NotificationSettings]
+          data <- req.as[PeriodicDueItemsSettings]
           newId <- Ident.randomId[F]
           task <- makeTask(newId, getBaseUrl(cfg, req), user.account, data)
           res <-
@@ -65,7 +67,7 @@ object NotifyDueItemsRoutes {
         } yield resp
 
       case req @ PUT -> Root =>
-        def run(data: NotificationSettings) =
+        def run(data: PeriodicDueItemsSettings) =
           for {
             task <- makeTask(data.id, getBaseUrl(cfg, req), user.account, data)
             res <-
@@ -75,7 +77,7 @@ object NotifyDueItemsRoutes {
             resp <- Ok(res)
           } yield resp
         for {
-          data <- req.as[NotificationSettings]
+          data <- req.as[PeriodicDueItemsSettings]
           resp <-
             if (data.id.isEmpty) Ok(BasicResult(false, "Empty id is not allowed"))
             else run(data)
@@ -83,7 +85,7 @@ object NotifyDueItemsRoutes {
 
       case req @ POST -> Root =>
         for {
-          data <- req.as[NotificationSettings]
+          data <- req.as[PeriodicDueItemsSettings]
           newId <- Ident.randomId[F]
           task <- makeTask(newId, getBaseUrl(cfg, req), user.account, data)
           res <-
@@ -95,10 +97,9 @@ object NotifyDueItemsRoutes {
 
       case GET -> Root =>
         ut.getNotifyDueItems(UserTaskScope(user.account))
-          .evalMap(task => taskToSettings(user.account, backend, task))
+          .evalMap(task => taskToSettings(backend, task))
           .compile
           .toVector
-          .map(v => NotificationSettingsList(v.toList))
           .flatMap(Ok(_))
     }
   }
@@ -110,50 +111,49 @@ object NotifyDueItemsRoutes {
       id: Ident,
       baseUrl: LenientUri,
       user: AccountId,
-      settings: NotificationSettings
+      settings: PeriodicDueItemsSettings
-  ): F[UserTask[NotifyDueItemsArgs]] =
+  ): F[UserTask[PeriodicDueItemsArgs]] =
-    Sync[F].pure(
+    Sync[F].pure(NotificationChannel.convert(settings.channel)).rethrow.map { channel =>
       UserTask(
         id,
-        NotifyDueItemsArgs.taskName,
+        PeriodicDueItemsArgs.taskName,
         settings.enabled,
         settings.schedule,
         settings.summary,
-        NotifyDueItemsArgs(
+        PeriodicDueItemsArgs(
           user,
-          settings.smtpConnection,
+          Right(channel),
-          settings.recipients,
-          Some(baseUrl / "app" / "item"),
           settings.remindDays,
           if (settings.capOverdue) Some(settings.remindDays)
           else None,
           settings.tagsInclude.map(_.id),
-          settings.tagsExclude.map(_.id)
+          settings.tagsExclude.map(_.id),
-        )
+          Some(baseUrl / "app" / "item")
         )
       )
+    }
 
   def taskToSettings[F[_]: Sync](
-      account: AccountId,
       backend: BackendApp[F],
-      task: UserTask[NotifyDueItemsArgs]
+      task: UserTask[PeriodicDueItemsArgs]
-  ): F[NotificationSettings] =
+  ): F[PeriodicDueItemsSettings] =
     for {
       tinc <- backend.tag.loadAll(task.args.tagsInclude)
       texc <- backend.tag.loadAll(task.args.tagsExclude)
-      conn <-
+
-        backend.mail
+      ch <- task.args.channel match {
-          .getSmtpSettings(account, None)
+        case Right(c) => NotificationChannel.convert(c).pure[F]
-          .map(
+        case Left(ref) =>
-            _.find(_.name == task.args.smtpConnection)
+          Sync[F].raiseError(
-              .map(_.name)
+            new IllegalStateException(s"ChannelRefs are not supported: $ref")
           )
-    } yield NotificationSettings(
+      }
+
+    } yield PeriodicDueItemsSettings(
       task.id,
       task.enabled,
       task.summary,
-      conn.getOrElse(Ident.unsafe("")),
+      ch,
-      task.args.recipients,
       task.timer,
       task.args.remindDays,
       task.args.daysBack.isDefined,

modules/restserver/src/main/scala/docspell/restserver/routes/PeriodicQueryRoutes.scala

@@ -0,0 +1,161 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.restserver.routes
+
+import cats.data.OptionT
+import cats.effect._
+import cats.implicits._
+
+import docspell.backend.BackendApp
+import docspell.backend.MailAddressCodec
+import docspell.backend.auth.AuthToken
+import docspell.common._
+import docspell.notification.api.PeriodicQueryArgs
+import docspell.query.ItemQueryParser
+import docspell.restapi.model._
+import docspell.restserver.Config
+import docspell.restserver.conv.Conversions
+import docspell.restserver.http4s.ClientRequestInfo
+import docspell.store.usertask._
+
+import org.http4s._
+import org.http4s.circe.CirceEntityDecoder._
+import org.http4s.circe.CirceEntityEncoder._
+import org.http4s.dsl.Http4sDsl
+
+object PeriodicQueryRoutes extends MailAddressCodec {
+
+  def apply[F[_]: Async](
+      cfg: Config,
+      backend: BackendApp[F],
+      user: AuthToken
+  ): HttpRoutes[F] = {
+    val dsl = new Http4sDsl[F] {}
+    val ut = backend.userTask
+    import dsl._
+
+    HttpRoutes.of {
+      case GET -> Root / Ident(id) =>
+        (for {
+          task <- ut.findPeriodicQuery(id, UserTaskScope(user.account))
+          res <- OptionT.liftF(taskToSettings(task))
+          resp <- OptionT.liftF(Ok(res))
+        } yield resp).getOrElseF(NotFound())
+
+      case req @ POST -> Root / "startonce" =>
+        for {
+          data <- req.as[PeriodicQuerySettings]
+          newId <- Ident.randomId[F]
+          task <- makeTask(newId, getBaseUrl(cfg, req), user.account, data)
+          res <-
+            ut.executeNow(UserTaskScope(user.account), None, task)
+              .attempt
+              .map(Conversions.basicResult(_, "Submitted successfully."))
+          resp <- Ok(res)
+        } yield resp
+
+      case DELETE -> Root / Ident(id) =>
+        for {
+          res <-
+            ut.deleteTask(UserTaskScope(user.account), id)
+              .attempt
+              .map(Conversions.basicResult(_, "Deleted successfully"))
+          resp <- Ok(res)
+        } yield resp
+
+      case req @ PUT -> Root =>
+        def run(data: PeriodicQuerySettings) =
+          for {
+            task <- makeTask(data.id, getBaseUrl(cfg, req), user.account, data)
+            res <-
+              ut.submitPeriodicQuery(UserTaskScope(user.account), None, task)
+                .attempt
+                .map(Conversions.basicResult(_, "Saved successfully"))
+            resp <- Ok(res)
+          } yield resp
+        for {
+          data <- req.as[PeriodicQuerySettings]
+          resp <-
+            if (data.id.isEmpty) Ok(BasicResult(false, "Empty id is not allowed"))
+            else run(data)
+        } yield resp
+
+      case req @ POST -> Root =>
+        for {
+          data <- req.as[PeriodicQuerySettings]
+          newId <- Ident.randomId[F]
+          task <- makeTask(newId, getBaseUrl(cfg, req), user.account, data)
+          res <-
+            ut.submitPeriodicQuery(UserTaskScope(user.account), None, task)
+              .attempt
+              .map(Conversions.basicResult(_, "Saved successfully."))
+          resp <- Ok(res)
+        } yield resp
+
+      case GET -> Root =>
+        ut.getPeriodicQuery(UserTaskScope(user.account))
+          .evalMap(task => taskToSettings(task))
+          .compile
+          .toVector
+          .flatMap(Ok(_))
+    }
+  }
+
+  private def getBaseUrl[F[_]](cfg: Config, req: Request[F]) =
+    ClientRequestInfo.getBaseUrl(cfg, req)
+
+  def makeTask[F[_]: Sync](
+      id: Ident,
+      baseUrl: LenientUri,
+      user: AccountId,
+      settings: PeriodicQuerySettings
+  ): F[UserTask[PeriodicQueryArgs]] =
+    Sync[F]
+      .pure(for {
+        ch <- NotificationChannel.convert(settings.channel)
+        qstr <- ItemQueryParser
+          .asString(settings.query.expr)
+          .left
+          .map(err => new IllegalArgumentException(s"Query not renderable: $err"))
+      } yield (ch, ItemQueryString(qstr)))
+      .rethrow
+      .map { case (channel, qstr) =>
+        UserTask(
+          id,
+          PeriodicQueryArgs.taskName,
+          settings.enabled,
+          settings.schedule,
+          settings.summary,
+          PeriodicQueryArgs(
+            user,
+            Right(channel),
+            qstr,
+            Some(baseUrl / "app" / "item")
+          )
+        )
+      }
+
+  def taskToSettings[F[_]: Sync](
+      task: UserTask[PeriodicQueryArgs]
+  ): F[PeriodicQuerySettings] =
+    for {
+      ch <- task.args.channel match {
+        case Right(c) => NotificationChannel.convert(c).pure[F]
+        case Left(ref) =>
+          Sync[F].raiseError(
+            new IllegalStateException(s"ChannelRefs are not supported: $ref")
+          )
+      }
+    } yield PeriodicQuerySettings(
+      task.id,
+      task.summary,
+      task.enabled,
+      ch,
+      ItemQueryParser.parseUnsafe(task.args.query.query),
+      task.timer
+    )
+}

modules/restserver/src/main/scala/docspell/restserver/ws/OutputEvent.scala

@@ -57,7 +57,6 @@ object OutputEvent {
 
   private case class Msg[A](tag: String, content: A)
   private object Msg {
-    @scala.annotation.nowarn
     implicit def jsonEncoder[A: Encoder]: Encoder[Msg[A]] =
       deriveEncoder
   }

modules/store/src/main/resources/db/migration/h2/V1.29.1__notification.sql

@@ -0,0 +1,62 @@
+create table "notification_channel_mail" (
+  "id" varchar(254) not null primary key,
+  "uid" varchar(254) not null,
+  "conn_id" varchar(254) not null,
+  "recipients" varchar(254) not null,
+  "created" timestamp not null,
+  foreign key ("uid") references "user_"("uid") on delete cascade,
+  foreign key ("conn_id") references "useremail"("id") on delete cascade
+);
+
+create table "notification_channel_gotify" (
+  "id" varchar(254) not null primary key,
+  "uid" varchar(254) not null,
+  "url" varchar(254) not null,
+  "app_key" varchar(254) not null,
+  "created" timestamp not null,
+  foreign key ("uid") references "user_"("uid") on delete cascade
+);
+
+create table "notification_channel_matrix" (
+  "id" varchar(254) not null primary key,
+  "uid" varchar(254) not null,
+  "home_server" varchar(254) not null,
+  "room_id" varchar(254) not null,
+  "access_token" varchar not null,
+  "message_type" varchar(254) not null,
+  "created" timestamp not null,
+  foreign key ("uid") references "user_"("uid") on delete cascade
+);
+
+create table "notification_channel_http" (
+  "id" varchar(254) not null primary key,
+  "uid" varchar(254) not null,
+  "url" varchar(254) not null,
+  "created" timestamp not null,
+  foreign key ("uid") references "user_"("uid") on delete cascade
+);
+
+create table "notification_hook" (
+  "id" varchar(254) not null primary key,
+  "uid" varchar(254) not null,
+  "enabled" boolean not null,
+  "channel_mail" varchar(254),
+  "channel_gotify" varchar(254),
+  "channel_matrix" varchar(254),
+  "channel_http" varchar(254),
+  "all_events" boolean not null,
+  "event_filter" varchar(500),
+  "created" timestamp not null,
+  foreign key ("uid") references "user_"("uid") on delete cascade,
+  foreign key ("channel_mail") references "notification_channel_mail"("id") on delete cascade,
+  foreign key ("channel_gotify") references "notification_channel_gotify"("id") on delete cascade,
+  foreign key ("channel_matrix") references "notification_channel_matrix"("id") on delete cascade,
+  foreign key ("channel_http") references "notification_channel_http"("id") on delete cascade
+);
+
+create table "notification_hook_event" (
+  "id" varchar(254) not null primary key,
+  "hook_id" varchar(254) not null,
+  "event_type" varchar(254) not null,
+  foreign key ("hook_id") references "notification_hook"("id") on delete cascade
+);

modules/store/src/main/resources/db/migration/mariadb/V1.29.1__notification.sql

@@ -0,0 +1,62 @@
+create table `notification_channel_mail` (
+  `id` varchar(254) not null primary key,
+  `uid` varchar(254) not null,
+  `conn_id` varchar(254) not null,
+  `recipients` varchar(254) not null,
+  `created` timestamp not null,
+  foreign key (`uid`) references `user_`(`uid`) on delete cascade,
+  foreign key (`conn_id`) references `useremail`(`id`) on delete cascade
+);
+
+create table `notification_channel_gotify` (
+  `id` varchar(254) not null primary key,
+  `uid` varchar(254) not null,
+  `url` varchar(254) not null,
+  `app_key` varchar(254) not null,
+  `created` timestamp not null,
+  foreign key (`uid`) references `user_`(`uid`) on delete cascade
+);
+
+create table `notification_channel_matrix` (
+  `id` varchar(254) not null primary key,
+  `uid` varchar(254) not null,
+  `home_server` varchar(254) not null,
+  `room_id` varchar(254) not null,
+  `access_token` text not null,
+  `message_type` varchar(254) not null,
+  `created` timestamp not null,
+  foreign key (`uid`) references `user_`(`uid`) on delete cascade
+);
+
+create table `notification_channel_http` (
+  `id` varchar(254) not null primary key,
+  `uid` varchar(254) not null,
+  `url` varchar(254) not null,
+  `created` timestamp not null,
+  foreign key (`uid`) references `user_`(`uid`) on delete cascade
+);
+
+create table `notification_hook` (
+  `id` varchar(254) not null primary key,
+  `uid` varchar(254) not null,
+  `enabled` boolean not null,
+  `channel_mail` varchar(254),
+  `channel_gotify` varchar(254),
+  `channel_matrix` varchar(254),
+  `channel_http` varchar(254),
+  `all_events` boolean not null,
+  `event_filter` varchar(500),
+  `created` timestamp not null,
+  foreign key (`uid`) references `user_`(`uid`) on delete cascade,
+  foreign key (`channel_mail`) references `notification_channel_mail`(`id`) on delete cascade,
+  foreign key (`channel_gotify`) references `notification_channel_gotify`(`id`) on delete cascade,
+  foreign key (`channel_matrix`) references `notification_channel_matrix`(`id`) on delete cascade,
+  foreign key (`channel_http`) references `notification_channel_http`(`id`) on delete cascade
+);
+
+create table `notification_hook_event` (
+  `id` varchar(254) not null primary key,
+  `hook_id` varchar(254) not null,
+  `event_type` varchar(254) not null,
+  foreign key (`hook_id`) references `notification_hook`(`id`) on delete cascade
+);

modules/store/src/main/resources/db/migration/postgresql/V1.29.1__notification.sql

@@ -0,0 +1,62 @@
+create table "notification_channel_mail" (
+  "id" varchar(254) not null primary key,
+  "uid" varchar(254) not null,
+  "conn_id" varchar(254) not null,
+  "recipients" varchar(254) not null,
+  "created" timestamp not null,
+  foreign key ("uid") references "user_"("uid") on delete cascade,
+  foreign key ("conn_id") references "useremail"("id") on delete cascade
+);
+
+create table "notification_channel_gotify" (
+  "id" varchar(254) not null primary key,
+  "uid" varchar(254) not null,
+  "url" varchar(254) not null,
+  "app_key" varchar(254) not null,
+  "created" timestamp not null,
+  foreign key ("uid") references "user_"("uid") on delete cascade
+);
+
+create table "notification_channel_matrix" (
+  "id" varchar(254) not null primary key,
+  "uid" varchar(254) not null,
+  "home_server" varchar(254) not null,
+  "room_id" varchar(254) not null,
+  "access_token" varchar not null,
+  "message_type" varchar(254) not null,
+  "created" timestamp not null,
+  foreign key ("uid") references "user_"("uid") on delete cascade
+);
+
+create table "notification_channel_http" (
+  "id" varchar(254) not null primary key,
+  "uid" varchar(254) not null,
+  "url" varchar(254) not null,
+  "created" timestamp not null,
+  foreign key ("uid") references "user_"("uid") on delete cascade
+);
+
+create table "notification_hook" (
+  "id" varchar(254) not null primary key,
+  "uid" varchar(254) not null,
+  "enabled" boolean not null,
+  "channel_mail" varchar(254),
+  "channel_gotify" varchar(254),
+  "channel_matrix" varchar(254),
+  "channel_http" varchar(254),
+  "all_events" boolean not null,
+  "event_filter" varchar(500),
+  "created" timestamp not null,
+  foreign key ("uid") references "user_"("uid") on delete cascade,
+  foreign key ("channel_mail") references "notification_channel_mail"("id") on delete cascade,
+  foreign key ("channel_gotify") references "notification_channel_gotify"("id") on delete cascade,
+  foreign key ("channel_matrix") references "notification_channel_matrix"("id") on delete cascade,
+  foreign key ("channel_http") references "notification_channel_http"("id") on delete cascade
+);
+
+create table "notification_hook_event" (
+  "id" varchar(254) not null primary key,
+  "hook_id" varchar(254) not null,
+  "event_type" varchar(254) not null,
+  foreign key ("hook_id") references "notification_hook"("id") on delete cascade
+);

modules/store/src/main/scala/db/migration/MigrationTasks.scala

@@ -0,0 +1,87 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package db.migration
+
+import cats.data.NonEmptyList
+import cats.effect.{IO, Sync}
+import cats.implicits._
+
+import docspell.common._
+import docspell.common.syntax.StringSyntax._
+import docspell.notification.api.Channel
+import docspell.notification.api.PeriodicDueItemsArgs
+import docspell.store.records.RPeriodicTask
+
+import doobie._
+import doobie.implicits._
+import doobie.util.transactor.Strategy
+import emil.MailAddress
+import emil.javamail.syntax._
+import io.circe.Encoder
+import io.circe.syntax._
+import org.flywaydb.core.api.migration.Context
+
+trait MigrationTasks {
+
+  def logger: org.log4s.Logger
+
+  implicit val jsonEncoder: Encoder[MailAddress] =
+    Encoder.encodeString.contramap(_.asUnicodeString)
+
+  def migrateDueItemTasks: ConnectionIO[Unit] =
+    for {
+      tasks <- RPeriodicTask.findByTask(NotifyDueItemsArgs.taskName)
+      _ <- Sync[ConnectionIO].delay(
+        logger.info(s"Starting to migrate ${tasks.size} user tasks")
+      )
+      _ <- tasks.traverse(migrateDueItemTask1)
+      _ <- RPeriodicTask.setEnabledByTask(NotifyDueItemsArgs.taskName, false)
+    } yield ()
+
+  def migrateDueItemTask1(old: RPeriodicTask): ConnectionIO[Int] = {
+    val converted = old.args
+      .parseJsonAs[NotifyDueItemsArgs]
+      .leftMap(_.getMessage())
+      .flatMap(convertArgs)
+
+    converted match {
+      case Right(args) =>
+        Sync[ConnectionIO].delay(logger.info(s"Converting user task: $old")) *>
+          RPeriodicTask.updateTask(
+            old.id,
+            PeriodicDueItemsArgs.taskName,
+            args.asJson.noSpaces
+          )
+
+      case Left(err) =>
+        logger.error(s"Error converting user task: $old. $err")
+        0.pure[ConnectionIO]
+    }
+  }
+
+  def convertArgs(old: NotifyDueItemsArgs): Either[String, PeriodicDueItemsArgs] =
+    old.recipients
+      .traverse(MailAddress.parse)
+      .flatMap(l => NonEmptyList.fromList(l).toRight("No recipients provided"))
+      .map { rec =>
+        PeriodicDueItemsArgs(
+          old.account,
+          Right(Channel.Mail(Ident.unsafe(""), old.smtpConnection, rec)),
+          old.remindDays,
+          old.daysBack,
+          old.tagsInclude,
+          old.tagsExclude,
+          old.itemDetailUrl
+        )
+      }
+
+  def mkTransactor(ctx: Context): Transactor[IO] = {
+    val xa = Transactor.fromConnection[IO](ctx.getConnection())
+    Transactor.strategy.set(xa, Strategy.void) //transactions are handled by flyway
+  }
+
+}

modules/store/src/main/scala/db/migration/h2/V1_29_2__MigrateNotifyTask.scala

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package db.migration.h2
+
+import cats.effect.unsafe.implicits._
+
+import db.migration.MigrationTasks
+import doobie.implicits._
+import org.flywaydb.core.api.migration.BaseJavaMigration
+import org.flywaydb.core.api.migration.Context
+
+class V1_29_2__MigrateNotifyTask extends BaseJavaMigration with MigrationTasks {
+  val logger = org.log4s.getLogger
+
+  override def migrate(ctx: Context): Unit = {
+    val xa = mkTransactor(ctx)
+    migrateDueItemTasks.transact(xa).unsafeRunSync()
+  }
+}

modules/store/src/main/scala/db/migration/mariadb/V1_29_2__MigrateNotifyTask.scala

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package db.migration.mariadb
+
+import cats.effect.unsafe.implicits._
+
+import db.migration.MigrationTasks
+import doobie.implicits._
+import org.flywaydb.core.api.migration.BaseJavaMigration
+import org.flywaydb.core.api.migration.Context
+
+class V1_29_2__MigrateNotifyTask extends BaseJavaMigration with MigrationTasks {
+  val logger = org.log4s.getLogger
+
+  override def migrate(ctx: Context): Unit = {
+    val xa = mkTransactor(ctx)
+    migrateDueItemTasks.transact(xa).unsafeRunSync()
+  }
+}

modules/store/src/main/scala/db/migration/postgresql/V1_29_2__MigrateNotifyTask.scala

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package db.migration.postgresql
+
+import cats.effect.unsafe.implicits._
+
+import db.migration.MigrationTasks
+import doobie.implicits._
+import org.flywaydb.core.api.migration.BaseJavaMigration
+import org.flywaydb.core.api.migration.Context
+
+class V1_29_2__MigrateNotifyTask extends BaseJavaMigration with MigrationTasks {
+  val logger = org.log4s.getLogger
+
+  override def migrate(ctx: Context): Unit = {
+    val xa = mkTransactor(ctx)
+    migrateDueItemTasks.transact(xa).unsafeRunSync()
+  }
+}

modules/store/src/main/scala/docspell/store/impl/DoobieMeta.scala

@@ -11,6 +11,8 @@ import java.time.{Instant, LocalDate}
 
 import docspell.common._
 import docspell.common.syntax.all._
+import docspell.jsonminiq.JsonMiniQuery
+import docspell.notification.api.EventType
 import docspell.query.{ItemQuery, ItemQueryParser}
 import docspell.totp.Key
 
@@ -148,6 +150,12 @@ trait DoobieMeta extends EmilDoobieMeta {
     Meta[String].timap(s => ItemQueryParser.parseUnsafe(s))(q =>
       q.raw.getOrElse(ItemQueryParser.unsafeAsString(q.expr))
     )
+
+  implicit val metaEventType: Meta[EventType] =
+    Meta[String].timap(EventType.unsafeFromString)(_.name)
+
+  implicit val metaJsonMiniQuery: Meta[JsonMiniQuery] =
+    Meta[String].timap(JsonMiniQuery.unsafeParse)(_.unsafeAsString)
 }
 
 object DoobieMeta extends DoobieMeta {

modules/store/src/main/scala/docspell/store/migrate/FlywayMigrate.scala

@@ -22,12 +22,12 @@ object FlywayMigrate {
       logger.info("Running db migrations...")
       val locations = jdbc.dbmsName match {
         case Some(dbtype) =>
-          List(s"classpath:db/migration/$dbtype")
+          List(s"classpath:db/migration/$dbtype", "classpath:db/migration/common")
         case None =>
           logger.warn(
             s"Cannot read database name from jdbc url: ${jdbc.url}. Go with H2"
           )
-          List("classpath:db/h2")
+          List("classpath:db/migration/h2", "classpath:db/migration/common")
       }
 
       logger.info(s"Using migration locations: $locations")

modules/store/src/main/scala/docspell/store/queries/ChannelMap.scala

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.store.queries
+
+import cats.data.{NonEmptyList, OptionT}
+import cats.effect._
+
+import docspell.notification.api.NotificationChannel
+import docspell.store.records._
+
+import doobie.ConnectionIO
+
+object ChannelMap {
+
+  def readMail(r: RNotificationChannelMail): ConnectionIO[Vector[NotificationChannel]] =
+    (for {
+      em <- OptionT(RUserEmail.getById(r.connection))
+      rec <- OptionT.fromOption[ConnectionIO](NonEmptyList.fromList(r.recipients))
+      ch = NotificationChannel.Email(em.toMailConfig, em.mailFrom, rec)
+    } yield Vector(ch)).getOrElse(Vector.empty)
+
+  def readGotify(
+      r: RNotificationChannelGotify
+  ): ConnectionIO[Vector[NotificationChannel]] =
+    pure(NotificationChannel.Gotify(r.url, r.appKey))
+
+  def readMatrix(
+      r: RNotificationChannelMatrix
+  ): ConnectionIO[Vector[NotificationChannel]] =
+    pure(NotificationChannel.Matrix(r.homeServer, r.roomId, r.accessToken, r.messageType))
+
+  def readHttp(
+      r: RNotificationChannelHttp
+  ): ConnectionIO[Vector[NotificationChannel]] =
+    pure(NotificationChannel.HttpPost(r.url, Map.empty))
+
+  private def pure[A](a: A): ConnectionIO[Vector[A]] =
+    Sync[ConnectionIO].pure(Vector(a))
+
+}

modules/store/src/main/scala/docspell/store/queries/QNotification.scala

@@ -0,0 +1,91 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.store.queries
+
+import cats.Monad
+import cats.data.OptionT
+import cats.implicits._
+
+import docspell.common._
+import docspell.notification.api._
+import docspell.store.qb.DSL._
+import docspell.store.qb.Select
+import docspell.store.records._
+
+import doobie._
+
+object QNotification {
+
+  private val hook = RNotificationHook.as("nh")
+  private val hevent = RNotificationHookEvent.as("ne")
+  private val user = RUser.as("u")
+
+  def findChannelsForEvent(event: Event): ConnectionIO[Vector[HookChannel]] =
+    for {
+      hooks <- listHooks(event.account.collective, event.eventType)
+      chs <- hooks.traverse(readHookChannel)
+    } yield chs
+
+  // --
+
+  final case class HookChannel(
+      hook: RNotificationHook,
+      channels: Vector[NotificationChannel]
+  )
+
+  def listHooks(
+      collective: Ident,
+      eventType: EventType
+  ): ConnectionIO[Vector[RNotificationHook]] =
+    run(
+      select(hook.all),
+      from(hook).leftJoin(hevent, hevent.hookId === hook.id),
+      hook.enabled === true && (hook.allEvents === true || hevent.eventType === eventType) && hook.uid
+        .in(
+          Select(select(user.uid), from(user), user.cid === collective)
+        )
+    ).query[RNotificationHook].to[Vector]
+
+  def readHookChannel(
+      hook: RNotificationHook
+  ): ConnectionIO[HookChannel] =
+    for {
+      c1 <- read(hook.channelMail)(RNotificationChannelMail.getById)(
+        ChannelMap.readMail
+      )
+      c2 <- read(hook.channelGotify)(RNotificationChannelGotify.getById)(
+        ChannelMap.readGotify
+      )
+      c3 <- read(hook.channelMatrix)(RNotificationChannelMatrix.getById)(
+        ChannelMap.readMatrix
+      )
+      c4 <- read(hook.channelHttp)(RNotificationChannelHttp.getById)(ChannelMap.readHttp)
+    } yield HookChannel(hook, c1 ++ c2 ++ c3 ++ c4)
+
+  def readChannel(ch: RNotificationChannel): ConnectionIO[Vector[NotificationChannel]] =
+    ch.fold(
+      ChannelMap.readMail,
+      ChannelMap.readGotify,
+      ChannelMap.readMatrix,
+      ChannelMap.readHttp
+    )
+
+  private def read[A, B](channel: Option[Ident])(
+      load: Ident => ConnectionIO[Option[A]]
+  )(
+      m: A => ConnectionIO[Vector[B]]
+  ): ConnectionIO[Vector[B]] =
+    channel match {
+      case Some(ch) =>
+        (for {
+          a <- OptionT(load(ch))
+          ch <- OptionT.liftF(m(a))
+        } yield ch).getOrElse(Vector.empty)
+      case None =>
+        Monad[ConnectionIO].pure(Vector.empty)
+    }
+}

modules/store/src/main/scala/docspell/store/records/RItem.scala

@@ -410,6 +410,14 @@ object RItem {
   def findByIdAndCollective(itemId: Ident, coll: Ident): ConnectionIO[Option[RItem]] =
     run(select(T.all), from(T), T.id === itemId && T.cid === coll).query[RItem].option
 
+  def findAllByIdAndCollective(
+      itemIds: NonEmptyList[Ident],
+      coll: Ident
+  ): ConnectionIO[Vector[RItem]] =
+    run(select(T.all), from(T), T.id.in(itemIds) && T.cid === coll)
+      .query[RItem]
+      .to[Vector]
+
   def findById(itemId: Ident): ConnectionIO[Option[RItem]] =
     run(select(T.all), from(T), T.id === itemId).query[RItem].option
 

modules/store/src/main/scala/docspell/store/records/RNotificationChannel.scala

@@ -0,0 +1,148 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.store.records
+
+import cats.data.OptionT
+
+import docspell.common._
+import docspell.notification.api.ChannelRef
+import docspell.notification.api.ChannelType
+
+import doobie._
+
+sealed trait RNotificationChannel {
+
+  def id: Ident
+
+  def fold[A](
+      f1: RNotificationChannelMail => A,
+      f2: RNotificationChannelGotify => A,
+      f3: RNotificationChannelMatrix => A,
+      f4: RNotificationChannelHttp => A
+  ): A
+
+}
+
+object RNotificationChannel {
+
+  final case class Email(r: RNotificationChannelMail) extends RNotificationChannel {
+
+    override def fold[A](
+        f1: RNotificationChannelMail => A,
+        f2: RNotificationChannelGotify => A,
+        f3: RNotificationChannelMatrix => A,
+        f4: RNotificationChannelHttp => A
+    ): A = f1(r)
+
+    val id = r.id
+  }
+
+  final case class Gotify(r: RNotificationChannelGotify) extends RNotificationChannel {
+    override def fold[A](
+        f1: RNotificationChannelMail => A,
+        f2: RNotificationChannelGotify => A,
+        f3: RNotificationChannelMatrix => A,
+        f4: RNotificationChannelHttp => A
+    ): A = f2(r)
+
+    val id = r.id
+  }
+
+  final case class Matrix(r: RNotificationChannelMatrix) extends RNotificationChannel {
+    override def fold[A](
+        f1: RNotificationChannelMail => A,
+        f2: RNotificationChannelGotify => A,
+        f3: RNotificationChannelMatrix => A,
+        f4: RNotificationChannelHttp => A
+    ): A = f3(r)
+
+    val id = r.id
+  }
+
+  final case class Http(r: RNotificationChannelHttp) extends RNotificationChannel {
+    override def fold[A](
+        f1: RNotificationChannelMail => A,
+        f2: RNotificationChannelGotify => A,
+        f3: RNotificationChannelMatrix => A,
+        f4: RNotificationChannelHttp => A
+    ): A = f4(r)
+
+    val id = r.id
+  }
+
+  def insert(r: RNotificationChannel): ConnectionIO[Int] =
+    r.fold(
+      RNotificationChannelMail.insert,
+      RNotificationChannelGotify.insert,
+      RNotificationChannelMatrix.insert,
+      RNotificationChannelHttp.insert
+    )
+
+  def update(r: RNotificationChannel): ConnectionIO[Int] =
+    r.fold(
+      RNotificationChannelMail.update,
+      RNotificationChannelGotify.update,
+      RNotificationChannelMatrix.update,
+      RNotificationChannelHttp.update
+    )
+
+  def getByAccount(account: AccountId): ConnectionIO[Vector[RNotificationChannel]] =
+    for {
+      mail <- RNotificationChannelMail.getByAccount(account)
+      gotify <- RNotificationChannelGotify.getByAccount(account)
+      matrix <- RNotificationChannelMatrix.getByAccount(account)
+      http <- RNotificationChannelHttp.getByAccount(account)
+    } yield mail.map(Email.apply) ++ gotify.map(Gotify.apply) ++ matrix.map(
+      Matrix.apply
+    ) ++ http.map(Http.apply)
+
+  def getById(id: Ident): ConnectionIO[Vector[RNotificationChannel]] =
+    for {
+      mail <- RNotificationChannelMail.getById(id)
+      gotify <- RNotificationChannelGotify.getById(id)
+      matrix <- RNotificationChannelMatrix.getById(id)
+      http <- RNotificationChannelHttp.getById(id)
+    } yield mail.map(Email.apply).toVector ++
+      gotify.map(Gotify.apply).toVector ++
+      matrix.map(Matrix.apply).toVector ++
+      http.map(Http.apply).toVector
+
+  def getByRef(ref: ChannelRef): ConnectionIO[Option[RNotificationChannel]] =
+    ref.channelType match {
+      case ChannelType.Mail =>
+        RNotificationChannelMail.getById(ref.id).map(_.map(Email.apply))
+      case ChannelType.Matrix =>
+        RNotificationChannelMatrix.getById(ref.id).map(_.map(Matrix.apply))
+      case ChannelType.Gotify =>
+        RNotificationChannelGotify.getById(ref.id).map(_.map(Gotify.apply))
+      case ChannelType.Http =>
+        RNotificationChannelHttp.getById(ref.id).map(_.map(Http.apply))
+    }
+
+  def getByHook(r: RNotificationHook): ConnectionIO[Vector[RNotificationChannel]] = {
+    def opt(id: Option[Ident]): OptionT[ConnectionIO, Ident] =
+      OptionT.fromOption(id)
+
+    for {
+      mail <- opt(r.channelMail).flatMapF(RNotificationChannelMail.getById).value
+      gotify <- opt(r.channelGotify).flatMapF(RNotificationChannelGotify.getById).value
+      matrix <- opt(r.channelMatrix).flatMapF(RNotificationChannelMatrix.getById).value
+      http <- opt(r.channelHttp).flatMapF(RNotificationChannelHttp.getById).value
+    } yield mail.map(Email.apply).toVector ++
+      gotify.map(Gotify.apply).toVector ++
+      matrix.map(Matrix.apply).toVector ++
+      http.map(Http.apply).toVector
+  }
+
+  def deleteByAccount(id: Ident, account: AccountId): ConnectionIO[Int] =
+    for {
+      n1 <- RNotificationChannelMail.deleteByAccount(id, account)
+      n2 <- RNotificationChannelGotify.deleteByAccount(id, account)
+      n3 <- RNotificationChannelMatrix.deleteByAccount(id, account)
+      n4 <- RNotificationChannelHttp.deleteByAccount(id, account)
+    } yield n1 + n2 + n3 + n4
+}

modules/store/src/main/scala/docspell/store/records/RNotificationChannelGotify.scala

@@ -0,0 +1,86 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.store.records
+
+import cats.data.NonEmptyList
+
+import docspell.common._
+import docspell.store.qb.DSL._
+import docspell.store.qb._
+
+import doobie._
+import doobie.implicits._
+
+final case class RNotificationChannelGotify(
+    id: Ident,
+    uid: Ident,
+    url: LenientUri,
+    appKey: Password,
+    created: Timestamp
+) {
+  def vary: RNotificationChannel =
+    RNotificationChannel.Gotify(this)
+}
+
+object RNotificationChannelGotify {
+
+  final case class Table(alias: Option[String]) extends TableDef {
+    val tableName = "notification_channel_gotify"
+
+    val id = Column[Ident]("id", this)
+    val uid = Column[Ident]("uid", this)
+    val url = Column[LenientUri]("url", this)
+    val appKey = Column[Password]("app_key", this)
+    val created = Column[Timestamp]("created", this)
+
+    val all: NonEmptyList[Column[_]] =
+      NonEmptyList.of(id, uid, url, appKey, created)
+  }
+
+  val T: Table = Table(None)
+  def as(alias: String): Table =
+    Table(Some(alias))
+
+  def getById(id: Ident): ConnectionIO[Option[RNotificationChannelGotify]] =
+    run(select(T.all), from(T), T.id === id).query[RNotificationChannelGotify].option
+
+  def insert(r: RNotificationChannelGotify): ConnectionIO[Int] =
+    DML.insert(T, T.all, sql"${r.id},${r.uid},${r.url},${r.appKey},${r.created}")
+
+  def update(r: RNotificationChannelGotify): ConnectionIO[Int] =
+    DML.update(
+      T,
+      T.id === r.id && T.uid === r.uid,
+      DML.set(
+        T.url.setTo(r.url),
+        T.appKey.setTo(r.appKey)
+      )
+    )
+
+  def getByAccount(
+      account: AccountId
+  ): ConnectionIO[Vector[RNotificationChannelGotify]] = {
+    val user = RUser.as("u")
+    val gotify = as("c")
+    Select(
+      select(gotify.all),
+      from(gotify).innerJoin(user, user.uid === gotify.uid),
+      user.cid === account.collective && user.login === account.user
+    ).build.query[RNotificationChannelGotify].to[Vector]
+  }
+
+  def deleteById(id: Ident): ConnectionIO[Int] =
+    DML.delete(T, T.id === id)
+
+  def deleteByAccount(id: Ident, account: AccountId): ConnectionIO[Int] = {
+    val u = RUser.as("u")
+    DML.delete(
+      T,
+      T.id === id && T.uid.in(Select(select(u.uid), from(u), u.isAccount(account)))
+    )
+  }
+}

modules/store/src/main/scala/docspell/store/records/RNotificationChannelHttp.scala

@@ -0,0 +1,75 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.store.records
+
+import cats.data.NonEmptyList
+
+import docspell.common._
+import docspell.store.qb.DSL._
+import docspell.store.qb._
+
+import doobie._
+import doobie.implicits._
+
+final case class RNotificationChannelHttp(
+    id: Ident,
+    uid: Ident,
+    url: LenientUri,
+    created: Timestamp
+) {
+  def vary: RNotificationChannel =
+    RNotificationChannel.Http(this)
+}
+
+object RNotificationChannelHttp {
+
+  final case class Table(alias: Option[String]) extends TableDef {
+    val tableName = "notification_channel_http"
+
+    val id = Column[Ident]("id", this)
+    val uid = Column[Ident]("uid", this)
+    val url = Column[LenientUri]("url", this)
+    val created = Column[Timestamp]("created", this)
+
+    val all: NonEmptyList[Column[_]] =
+      NonEmptyList.of(id, uid, url, created)
+  }
+
+  val T: Table = Table(None)
+  def as(alias: String): Table =
+    Table(Some(alias))
+
+  def getById(id: Ident): ConnectionIO[Option[RNotificationChannelHttp]] =
+    run(select(T.all), from(T), T.id === id).query[RNotificationChannelHttp].option
+
+  def insert(r: RNotificationChannelHttp): ConnectionIO[Int] =
+    DML.insert(T, T.all, sql"${r.id},${r.uid},${r.url},${r.created}")
+
+  def update(r: RNotificationChannelHttp): ConnectionIO[Int] =
+    DML.update(T, T.id === r.id && T.uid === r.uid, DML.set(T.url.setTo(r.url)))
+
+  def getByAccount(account: AccountId): ConnectionIO[Vector[RNotificationChannelHttp]] = {
+    val user = RUser.as("u")
+    val http = as("c")
+    Select(
+      select(http.all),
+      from(http).innerJoin(user, user.uid === http.uid),
+      user.cid === account.collective && user.login === account.user
+    ).build.query[RNotificationChannelHttp].to[Vector]
+  }
+
+  def deleteById(id: Ident): ConnectionIO[Int] =
+    DML.delete(T, T.id === id)
+
+  def deleteByAccount(id: Ident, account: AccountId): ConnectionIO[Int] = {
+    val u = RUser.as("u")
+    DML.delete(
+      T,
+      T.id === id && T.uid.in(Select(select(u.uid), from(u), u.isAccount(account)))
+    )
+  }
+}

modules/store/src/main/scala/docspell/store/records/RNotificationChannelMail.scala

@@ -0,0 +1,88 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.store.records
+
+import cats.data.NonEmptyList
+
+import docspell.common._
+import docspell.store.qb.DSL._
+import docspell.store.qb._
+
+import doobie._
+import doobie.implicits._
+import emil.MailAddress
+
+final case class RNotificationChannelMail(
+    id: Ident,
+    uid: Ident,
+    connection: Ident,
+    recipients: List[MailAddress],
+    created: Timestamp
+) {
+  def vary: RNotificationChannel =
+    RNotificationChannel.Email(this)
+}
+
+object RNotificationChannelMail {
+  final case class Table(alias: Option[String]) extends TableDef {
+
+    val tableName = "notification_channel_mail"
+
+    val id = Column[Ident]("id", this)
+    val uid = Column[Ident]("uid", this)
+    val connection = Column[Ident]("conn_id", this)
+    val recipients = Column[List[MailAddress]]("recipients", this)
+    val created = Column[Timestamp]("created", this)
+
+    val all: NonEmptyList[Column[_]] =
+      NonEmptyList.of(id, uid, connection, recipients, created)
+  }
+
+  val T: Table = Table(None)
+  def as(alias: String): Table = Table(Some(alias))
+
+  def insert(r: RNotificationChannelMail): ConnectionIO[Int] =
+    DML.insert(
+      T,
+      T.all,
+      sql"${r.id},${r.uid},${r.connection},${r.recipients},${r.created}"
+    )
+
+  def update(r: RNotificationChannelMail): ConnectionIO[Int] =
+    DML.update(
+      T,
+      T.id === r.id && T.uid === r.uid,
+      DML.set(
+        T.connection.setTo(r.connection),
+        T.recipients.setTo(r.recipients.toList)
+      )
+    )
+
+  def getById(id: Ident): ConnectionIO[Option[RNotificationChannelMail]] =
+    run(select(T.all), from(T), T.id === id).query[RNotificationChannelMail].option
+
+  def getByAccount(account: AccountId): ConnectionIO[Vector[RNotificationChannelMail]] = {
+    val user = RUser.as("u")
+    val gotify = as("c")
+    Select(
+      select(gotify.all),
+      from(gotify).innerJoin(user, user.uid === gotify.uid),
+      user.cid === account.collective && user.login === account.user
+    ).build.query[RNotificationChannelMail].to[Vector]
+  }
+
+  def deleteById(id: Ident): ConnectionIO[Int] =
+    DML.delete(T, T.id === id)
+
+  def deleteByAccount(id: Ident, account: AccountId): ConnectionIO[Int] = {
+    val u = RUser.as("u")
+    DML.delete(
+      T,
+      T.id === id && T.uid.in(Select(select(u.uid), from(u), u.isAccount(account)))
+    )
+  }
+}