Updated API Protocol (markdown)

API-Protocol.md

@@ -296,18 +296,26 @@ struct {
   opaque iv[16];
   opaque ciphertext[...]; // The IncomingPushMessageSignal
   opaque mac[10];
+}
 ```
 
 The IncomingPushMessageSignal protocol buffer:
 
 ```
-message OutgoingMessageSignal {
+message IncomingPushMessageSignal {
-  optional uint32 type         = 1;
+  enum Type {
+    UNKNOWN       = 0;
+    CIPHERTEXT    = 1;
+    KEY_EXCHANGE  = 2;
+    PREKEY_BUNDLE = 3;
+    PLAINTEXT     = 4;
+  }
+  optional Type   type         = 1;
   optional string source       = 2;
+  optional uint32 sourceDevice = 7;
   optional string relay        = 3;
-  repeated string destinations = 4;
   optional uint64 timestamp    = 5;
-  optional bytes message       = 6; // Encrypted PushMessageContent (above)
+  optional bytes  message      = 6; // Contains an encrypted PushMessageContent
 }
 ```
 
@@ -317,15 +325,34 @@ Recall that a push message is transmitted as the following structure:
 
 ```
 message PushMessageContent {
-  optional string body = 1;
-
   message AttachmentPointer {
     optional fixed64 id          = 1;
     optional string  contentType = 2;
     optional bytes   key         = 3;
   }
 
+  message GroupContext {
+    enum Type {
+      UNKNOWN = 0;
+      UPDATE  = 1;
+      DELIVER = 2;
+      QUIT    = 3;
+    }
+    optional bytes             id      = 1;
+    optional Type              type    = 2;
+    optional string            name    = 3;
+    repeated string            members = 4;
+    optional AttachmentPointer avatar  = 5;
+  }
+
+  enum Flags {
+    END_SESSION = 1;
+  }
+
+  optional string            body        = 1;
   repeated AttachmentPointer attachments = 2;
+  optional GroupContext      group       = 3;
+  optional Flags             flags       = 4;
 }
 ```