`mimetype` field is optional

CHANGES.md

@@ -31,6 +31,7 @@ Bugfix 🐛:
  - Cross-Signing | web <-> riotX After QR code scan, gossiping fails (#1210)
  - Fix crash when trying to download file without internet connection (#1229)
  - Local echo are not updated in timeline (for failed & encrypted states)
+ - Render image event even if thumbnail_info does not have mimetype defined (#1209)
 
 Translations 🗣:
  -

matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/model/message/AudioInfo.kt

@@ -24,7 +24,7 @@ data class AudioInfo(
         /**
          * The mimetype of the audio e.g. "audio/aac".
          */
-        @Json(name = "mimetype") val mimeType: String,
+        @Json(name = "mimetype") val mimeType: String?,
 
         /**
          * The size of the audio clip in bytes.

matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/model/message/ThumbnailInfo.kt

@@ -39,5 +39,5 @@ data class ThumbnailInfo(
         /**
          * The mimetype of the image, e.g. "image/jpeg".
          */
-        @Json(name = "mimetype") val mimeType: String
+        @Json(name = "mimetype") val mimeType: String?
 )

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/LocalEchoEventFactory.kt

@@ -314,7 +314,7 @@ internal class LocalEchoEventFactory @Inject constructor(
                 msgType = MessageType.MSGTYPE_AUDIO,
                 body = attachment.name ?: "audio",
                 audioInfo = AudioInfo(
-                        mimeType = attachment.getSafeMimeType()?.takeIf { it.isNotBlank() } ?: "audio/mpeg",
+                        mimeType = attachment.getSafeMimeType()?.takeIf { it.isNotBlank() },
                         size = attachment.size
                 ),
                 url = attachment.queryUri.toString()
@@ -327,8 +327,7 @@ internal class LocalEchoEventFactory @Inject constructor(
                 msgType = MessageType.MSGTYPE_FILE,
                 body = attachment.name ?: "file",
                 info = FileInfo(
-                        mimeType = attachment.getSafeMimeType()?.takeIf { it.isNotBlank() }
-                                ?: "application/octet-stream",
+                        mimeType = attachment.getSafeMimeType()?.takeIf { it.isNotBlank() },
                         size = attachment.size
                 ),
                 url = attachment.queryUri.toString()