Add support for eml (rfc822 email) files

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

@@ -0,0 +1,24 @@
+package docspell.common
+
+import fs2.Stream
+
+final case class Binary[F[_]](name: String, mime: MimeType, data: Stream[F, Byte]) {
+
+  def withMime(mime: MimeType): Binary[F] =
+    copy(mime = mime)
+}
+
+object Binary {
+
+  def apply[F[_]](name: String, data: Stream[F, Byte]): Binary[F] =
+    Binary[F](name, MimeType.octetStream, data)
+
+  def utf8[F[_]](name: String, content: String): Binary[F] =
+    Binary[F](name, MimeType.octetStream, Stream.emit(content).through(fs2.text.utf8Encode))
+
+  def text[F[_]](name: String, content: String): Binary[F] =
+    utf8(name, content).withMime(MimeType.plain)
+
+  def html[F[_]](name: String, content: String): Binary[F] =
+    utf8(name, content).withMime(MimeType.html)
+}

modules/files/src/main/scala/docspell/files/Zip.scala

@@ -6,27 +6,26 @@ import fs2.{Pipe, Stream}
 import java.io.InputStream
 import java.util.zip.ZipInputStream
 import java.nio.file.Paths
+import docspell.common.Binary
 
 object Zip {
 
-  case class Entry[F[_]](name: String, data: Stream[F, Byte])
-
   def unzipP[F[_]: ConcurrentEffect: ContextShift](
       chunkSize: Int,
       blocker: Blocker
-  ): Pipe[F, Byte, Entry[F]] =
+  ): Pipe[F, Byte, Binary[F]] =
     s => unzip[F](chunkSize, blocker)(s)
 
   def unzip[F[_]: ConcurrentEffect: ContextShift](chunkSize: Int, blocker: Blocker)(
       data: Stream[F, Byte]
-  ): Stream[F, Entry[F]] =
+  ): Stream[F, Binary[F]] =
     data.through(fs2.io.toInputStream[F]).flatMap(in => unzipJava(in, chunkSize, blocker))
 
   def unzipJava[F[_]: Sync: ContextShift](
       in: InputStream,
       chunkSize: Int,
       blocker: Blocker
-  ): Stream[F, Entry[F]] = {
+  ): Stream[F, Binary[F]] = {
     val zin = new ZipInputStream(in)
 
     val nextEntry = Resource.make(Sync[F].delay(Option(zin.getNextEntry))) {
@@ -42,7 +41,7 @@ object Zip {
         val name = Paths.get(ze.getName()).getFileName.toString
         val data =
           fs2.io.readInputStream[F]((zin: InputStream).pure[F], chunkSize, blocker, false)
-        Entry(name, data)
+        Binary(name, data)
       }
   }
 }

modules/joex/src/main/scala/docspell/joex/mail/ReadMail.scala

@@ -0,0 +1,62 @@
+package docspell.joex.mail
+
+import cats.effect._
+import cats.implicits._
+import fs2.{Pipe, Stream}
+import emil.{MimeType => _, _}
+import emil.javamail.syntax._
+import cats.Applicative
+
+import docspell.common._
+
+object ReadMail {
+
+  def read[F[_]: Sync](str: String): F[Mail[F]] =
+    Mail.deserialize(str)
+
+  def readBytesP[F[_]: Sync](logger: Logger[F]): Pipe[F, Byte, Binary[F]] =
+    s =>
+      Stream.eval(logger.debug(s"Converting e-mail into its parts")) >>
+        bytesToMail(s).flatMap(mailToEntries[F](logger))
+
+  def bytesToMail[F[_]: Sync](data: Stream[F, Byte]): Stream[F, Mail[F]] =
+    data.through(fs2.text.utf8Decode).foldMonoid.evalMap(read[F])
+
+  def mailToEntries[F[_]: Applicative](
+      logger: Logger[F]
+  )(mail: Mail[F]): Stream[F, Binary[F]] = {
+    val bodyEntry: F[Option[Binary[F]]] = mail.body.fold(
+      _ => (None: Option[Binary[F]]).pure[F],
+      txt => txt.text.map(c => Binary.text[F]("mail.txt", c).some),
+      html => html.html.map(c => Binary.html[F]("mail.html", c).some),
+      both => both.html.map(c => Binary.html[F]("mail.html", c).some)
+    )
+
+    Stream.eval(
+      logger.debug(
+        s"E-mail has ${mail.attachments.size} attachments and ${bodyType(mail.body)}"
+      )
+    ) >>
+      (Stream
+        .eval(bodyEntry)
+        .flatMap(e => Stream.emits(e.toSeq)) ++
+        Stream
+          .emits(mail.attachments.all)
+          .map(a =>
+            Binary(a.filename.getOrElse("noname"), a.mimeType.toDocspell, a.content)
+          ))
+  }
+
+  implicit class MimeTypeConv(m: emil.MimeType) {
+    def toDocspell: MimeType =
+      MimeType(m.primary, m.sub)
+  }
+
+  private def bodyType[F[_]](body: MailBody[F]): String =
+    body.fold(
+      _ => "empty-body",
+      _ => "text-body",
+      _ => "html-body",
+      _ => "text-and-html-body"
+    )
+}

modules/joex/src/main/scala/docspell/joex/process/ExtractArchive.scala

@@ -7,6 +7,7 @@ import cats.effect._
 import cats.implicits._
 import fs2.Stream
 import docspell.common._
+import docspell.joex.mail._
 import docspell.joex.scheduler._
 import docspell.store.records._
 import docspell.files.Zip
@@ -74,6 +75,11 @@ object ExtractArchive {
           extractZip(ctx, archive)(ra)
             .flatTap(_ => cleanupParents(ctx, ra, archive))
 
+      case Mimetype("message", "rfc822", _) =>
+        ctx.logger.info(s"Reading e-mail ${ra.name.getOrElse("<noname>")}") *>
+          extractMail(ctx, archive)(ra)
+            .flatTap(_ => cleanupParents(ctx, ra, archive))
+
       case _ =>
         ctx.logger.debug(s"Not an archive: ${mime.asString}") *>
           Extracted.noArchive(ra).pure[F]
@@ -114,8 +120,37 @@ object ExtractArchive {
 
     zipData
       .through(Zip.unzipP[F](8192, ctx.blocker))
-      .flatMap { entry =>
+      .flatMap(handleEntry(ctx, ra, archive))
-        val mimeHint = MimetypeHint.filename(entry.name)
+      .foldMonoid
+      .compile
+      .lastOrError
+  }
+
+  def extractMail[F[_]: Sync](
+      ctx: Context[F, _],
+      archive: Option[RAttachmentArchive]
+  )(ra: RAttachment): F[Extracted] = {
+    val email = ctx.store.bitpeace
+      .get(ra.fileId.id)
+      .unNoneTerminate
+      .through(ctx.store.bitpeace.fetchData2(RangeDef.all))
+
+    email
+      .through(ReadMail.readBytesP[F](ctx.logger))
+      .flatMap(handleEntry(ctx, ra, archive))
+      .foldMonoid
+      .compile
+      .lastOrError
+  }
+
+  def handleEntry[F[_]: Sync](
+      ctx: Context[F, _],
+      ra: RAttachment,
+      archive: Option[RAttachmentArchive]
+  )(
+      entry: Binary[F]
+  ): Stream[F, Extracted] = {
+    val mimeHint = MimetypeHint.filename(entry.name).withAdvertised(entry.mime.asString)
     val fileMeta = ctx.store.bitpeace.saveNew(entry.data, 8192, mimeHint)
     Stream.eval(ctx.logger.debug(s"Extracted ${entry.name}. Storing as attachment.")) >>
       fileMeta.evalMap { fm =>
@@ -132,10 +167,7 @@ object ExtractArchive {
           Extracted.of(nra, aa)
         }
       }
-      }
+
-      .foldMonoid
-      .compile
-      .lastOrError
   }
 
   def storeAttachment[F[_]: Sync](ctx: Context[F, _])(ra: RAttachment): F[Int] = {