Add a new column to distinguish local from external users

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

@@ -0,0 +1,35 @@
+package docspell.common
+
+import cats.data.NonEmptyList
+import io.circe.{Decoder, Encoder}
+
+sealed trait AccountSource { self: Product =>
+
+  def name: String =
+    self.productPrefix.toLowerCase
+}
+
+object AccountSource {
+
+  case object Local  extends AccountSource
+  case object OpenId extends AccountSource
+
+  val all: NonEmptyList[AccountSource] =
+    NonEmptyList.of(Local, OpenId)
+
+  def fromString(str: String): Either[String, AccountSource] =
+    str.toLowerCase match {
+      case "local"  => Right(Local)
+      case "openid" => Right(OpenId)
+      case _        => Left(s"Invalid account source: $str")
+    }
+
+  def unsafeFromString(str: String): AccountSource =
+    fromString(str).fold(sys.error, identity)
+
+  implicit val jsonDecoder: Decoder[AccountSource] =
+    Decoder.decodeString.emap(fromString)
+
+  implicit val jsonEncoder: Encoder[AccountSource] =
+    Encoder.encodeString.contramap(_.name)
+}