Add mail-debug flag to rest-server

It has been added to the joex application, but it should be possible
to debug mail problems on both apps.

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

@@ -9,7 +9,7 @@ import docspell.store.queue.JobQueue
 import docspell.store.usertask.UserTaskStore
 
 import scala.concurrent.ExecutionContext
-import emil.javamail.JavaMailEmil
+import emil.javamail.{JavaMailEmil, Settings}
 
 trait BackendApp[F[_]] {
 
@@ -38,21 +38,23 @@ object BackendApp {
       blocker: Blocker
   ): Resource[F, BackendApp[F]] =
     for {
-      utStore      <- UserTaskStore(store)
+      utStore    <- UserTaskStore(store)
-      queue        <- JobQueue(store)
+      queue      <- JobQueue(store)
-      loginImpl    <- Login[F](store)
+      loginImpl  <- Login[F](store)
-      signupImpl   <- OSignup[F](store)
+      signupImpl <- OSignup[F](store)
-      collImpl     <- OCollective[F](store)
+      collImpl   <- OCollective[F](store)
-      sourceImpl   <- OSource[F](store)
+      sourceImpl <- OSource[F](store)
-      tagImpl      <- OTag[F](store)
+      tagImpl    <- OTag[F](store)
-      equipImpl    <- OEquipment[F](store)
+      equipImpl  <- OEquipment[F](store)
-      orgImpl      <- OOrganization(store)
+      orgImpl    <- OOrganization(store)
-      joexImpl     <- OJoex.create(httpClientEc, store)
+      joexImpl   <- OJoex.create(httpClientEc, store)
-      uploadImpl   <- OUpload(store, queue, cfg.files, joexImpl)
+      uploadImpl <- OUpload(store, queue, cfg.files, joexImpl)
-      nodeImpl     <- ONode(store)
+      nodeImpl   <- ONode(store)
-      jobImpl      <- OJob(store, joexImpl)
+      jobImpl    <- OJob(store, joexImpl)
-      itemImpl     <- OItem(store)
+      itemImpl   <- OItem(store)
-      mailImpl     <- OMail(store, JavaMailEmil(blocker))
+      javaEmil =
+        JavaMailEmil(blocker, Settings.defaultSettings.copy(debug = cfg.mailDebug))
+      mailImpl     <- OMail(store, javaEmil)
       userTaskImpl <- OUserTask(utStore, queue, joexImpl)
     } yield new BackendApp[F] {
       val login: Login[F]            = loginImpl

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

@@ -4,7 +4,12 @@ import docspell.backend.signup.{Config => SignupConfig}
 import docspell.common._
 import docspell.store.JdbcConfig
 
-case class Config(jdbc: JdbcConfig, signup: SignupConfig, files: Config.Files) {}
+case class Config(
+    mailDebug: Boolean,
+    jdbc: JdbcConfig,
+    signup: SignupConfig,
+    files: Config.Files
+) {}
 
 object Config {
 

modules/restserver/src/main/resources/reference.conf

@@ -79,6 +79,11 @@ docspell.server {
 
   # Configuration for the backend.
   backend {
+    # Enable or disable debugging for e-mail related functionality. This
+    # applies to both sending and receiving mails. For security reasons
+    # logging is not very extensive on authentication failures. Setting
+    # this to true, results in a lot of data printed to stdout.
+    mail-debug = false
 
     # The database connection.
     #

nix/module-server.nix

@@ -41,6 +41,7 @@ let
       session-valid = "5 minutes";
     };
     backend = {
+      mail-debug = false;
       jdbc = {
         url = "jdbc:h2:///tmp/docspell-demo.db;MODE=PostgreSQL;DATABASE_TO_LOWER=TRUE;AUTO_SERVER=TRUE";
         user = "sa";
@@ -260,6 +261,16 @@ in {
       backend = mkOption {
         type = types.submodule({
           options = {
+            mail-debug = mkOption {
+              type = types.bool;
+              default = defaults.backend.mail-debug;
+              description = ''
+               Enable or disable debugging for e-mail related functionality. This
+               applies to both sending and receiving mails. For security reasons
+               logging is not very extensive on authentication failures. Setting
+               this to true, results in a lot of data printed to stdout.
+              '';
+            };
             jdbc = mkOption {
               type = types.submodule ({
                 options = {