Add support for more generic notification

This is a start to have different kinds of notifications. It is
possible to be notified via e-mail, matrix or gotify. It also extends
the current "periodic query" for due items by allowing notification
over different channels. A "generic periodic query" variant is added
as well.

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()
+  }
+}