PLT-3711: Add websocket event for emoji addition (#6211)

* PLT-3711: Add websocket event for emoji addition

* (SA) updated as per review

This PR is edited directly to merge into master.

* (SA) updated as per review

This PR is edited directly to merge into master.

webapp/actions/websocket_actions.jsx

@@ -230,6 +230,10 @@ function handleEvent(msg) {
         handleReactionRemovedEvent(msg);
         break;
 
+    case SocketEvents.EMOJI_ADDED:
+        handleAddEmoji(msg);
+        break;
+
     default:
     }
 }
@@ -438,6 +442,15 @@ function handleReactionAddedEvent(msg) {
     });
 }
 
+function handleAddEmoji(msg) {
+    const data = JSON.parse(msg.data.emoji);
+
+    AppDispatcher.handleServerAction({
+        type: ActionTypes.RECEIVED_CUSTOM_EMOJI,
+        emoji: data
+    });
+}
+
 function handleReactionRemovedEvent(msg) {
     const reaction = JSON.parse(msg.data.reaction);