Streaming Consent (#227)

* streamed consent message

* nit

* nit

* comments

proto/mls/message_contents/content.proto

@@ -62,9 +62,11 @@ message PlaintextEnvelope {
       // Expected to be EncodedContent
       bytes content = 2;
       // Initiator sends a request to receive sync payload
-      DeviceSyncRequest request = 3;
+      DeviceSyncRequest device_sync_request = 3;
       // Some other authorized installation sends a reply with a link to payload
-      DeviceSyncReply reply = 4;
+      DeviceSyncReply device_sync_reply = 4;
+      // A streamed cosnent update
+      ConsentUpdate consent_update = 5;
     }
   }
 
@@ -113,3 +115,25 @@ enum DeviceSyncKind {
   DEVICE_SYNC_KIND_MESSAGE_HISTORY = 1;
   DEVICE_SYNC_KIND_CONSENT = 2;
 }
+
+// A streamed consent update
+message ConsentUpdate {
+  ConsentEntityType entity_type = 1;
+  ConsentState state = 2;
+  string entity = 3;
+}
+
+// The type of entity the user is consenting to
+enum ConsentEntityType {
+  CONSENT_ENTITY_TYPE_UNSPECIFIED = 0;
+  CONSENT_ENTITY_TYPE_CONVERSATION_ID = 1;
+  CONSENT_ENTITY_TYPE_INBOX_ID = 2;
+  CONSENT_ENTITY_TYPE_ADDRESS = 3;
+}
+
+// Possible states of consent
+enum ConsentState {
+  CONSENT_STATE_UNSPECIFIED = 0;
+  CONSENT_STATE_ALLOWED = 1;
+  CONSENT_STATE_DENIED = 2;
+}