From ea0c3c8a36a1b7315726b4424a2dfccea3dcbc10 Mon Sep 17 00:00:00 2001
From: Anton Chekulaev <metaphore@bk.ru>
Date: Thu, 10 Dec 2020 13:41:54 +1100
Subject: [PATCH] Send "unidentified sender" messages as plain text.

---
 .../securesms/jobs/PushGroupSendJob.java      |  2 +-
 .../service/loki/crypto/LokiServiceCipher.kt  | 19 +++++++++++++------
 2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/app/src/main/java/org/thoughtcrime/securesms/jobs/PushGroupSendJob.java b/app/src/main/java/org/thoughtcrime/securesms/jobs/PushGroupSendJob.java
index b8e6b63804..c4faad91d4 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/jobs/PushGroupSendJob.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/jobs/PushGroupSendJob.java
@@ -135,7 +135,7 @@ public class PushGroupSendJob extends PushSendJob implements InjectableType {
 
   @Override
   public void onPushSend()
-      throws IOException, MmsException, NoSuchMessageException,  RetryLaterException
+      throws IOException, MmsException, NoSuchMessageException, RetryLaterException
   {
     MmsDatabase               database                   = DatabaseFactory.getMmsDatabase(context);
     OutgoingMediaMessage      message                    = database.getOutgoingMessage(messageId);
diff --git a/libsignal/src/main/java/org/session/libsignal/service/loki/crypto/LokiServiceCipher.kt b/libsignal/src/main/java/org/session/libsignal/service/loki/crypto/LokiServiceCipher.kt
index a11ef27c61..e48d04da6b 100644
--- a/libsignal/src/main/java/org/session/libsignal/service/loki/crypto/LokiServiceCipher.kt
+++ b/libsignal/src/main/java/org/session/libsignal/service/loki/crypto/LokiServiceCipher.kt
@@ -23,13 +23,20 @@ class LokiServiceCipher(
 
     override fun decrypt(envelope: SignalServiceEnvelope, ciphertext: ByteArray): Plaintext {
 //        return if (envelope.isFallbackMessage) decryptFallbackMessage(envelope, ciphertext) else super.decrypt(envelope, ciphertext)
-//        return decryptFallbackMessage(envelope, ciphertext);
 
-        //AC: Messages come unencrypted (for refactoring time being).
-        val transportDetails = PushTransportDetails(FallbackSessionCipher.sessionVersion)
-        val unpaddedMessageBody = transportDetails.getStrippedPaddingMessageBody(ciphertext)
-        val metadata = Metadata(envelope.source, envelope.sourceDevice, envelope.timestamp, false)
-        return Plaintext(metadata, unpaddedMessageBody)
+        return when {
+            envelope.isUnidentifiedSender -> {
+                //AC: Messages come unencrypted (for refactoring time being).
+                val transportDetails = PushTransportDetails(FallbackSessionCipher.sessionVersion)
+                val unpaddedMessageBody = transportDetails.getStrippedPaddingMessageBody(ciphertext)
+                val metadata = Metadata(envelope.source, envelope.sourceDevice, envelope.timestamp, false)
+                return Plaintext(metadata, unpaddedMessageBody)
+            }
+            envelope.isFallbackMessage ->
+                decryptFallbackMessage(envelope, ciphertext)
+            else ->
+                super.decrypt(envelope, ciphertext)
+        }
     }
 
     private fun decryptFallbackMessage(envelope: SignalServiceEnvelope, ciphertext: ByteArray): Plaintext {