Start work on adding reaction support

src/client/actions/ActionsManager.js

@@ -6,6 +6,8 @@ class ActionsManager {
     this.register('MessageDelete');
     this.register('MessageDeleteBulk');
     this.register('MessageUpdate');
+    this.register('MessageReactionAdd');
+    this.register('MessageReactionRemove');
     this.register('ChannelCreate');
     this.register('ChannelDelete');
     this.register('ChannelUpdate');

src/client/actions/MessageReactionAdd.js

@@ -0,0 +1,38 @@
+const Action = require('./Action');
+const Constants = require('../../util/Constants');
+
+/*
+{ user_id: 'id',
+     message_id: 'id',
+     emoji: { name: '<27>', id: null },
+     channel_id: 'id' } }
+*/
+
+class MessageReactionAdd extends Action {
+  handle(data) {
+    const user = this.client.users.get(data.user_id);
+    if (!user) return false;
+
+    const channel = this.client.channels.get(data.channel_id);
+    if (!channel || channel.type === 'voice') return false;
+
+    const message = channel.messages.get(data.message_id);
+    if (!message) return false;
+
+    if (!data.emoji) return false;
+
+    const reaction = message._addReaction(data.emoji, user);
+
+    if (reaction) {
+      this.client.emit(Constants.Events.MESSAGE_REACTION_ADD, reaction, user);
+    }
+
+    return {
+      message,
+      reaction,
+      user,
+    };
+  }
+}
+
+module.exports = MessageReactionAdd;

src/client/actions/MessageReactionRemove.js

@@ -0,0 +1,38 @@
+const Action = require('./Action');
+const Constants = require('../../util/Constants');
+
+/*
+{ user_id: 'id',
+     message_id: 'id',
+     emoji: { name: '<27>', id: null },
+     channel_id: 'id' } }
+*/
+
+class MessageReactionRemove extends Action {
+  handle(data) {
+    const user = this.client.users.get(data.user_id);
+    if (!user) return false;
+
+    const channel = this.client.channels.get(data.channel_id);
+    if (!channel || channel.type === 'voice') return false;
+
+    const message = channel.messages.get(data.message_id);
+    if (!message) return false;
+
+    if (!data.emoji) return false;
+
+    const reaction = message._removeReaction(data.emoji, user);
+
+    if (reaction) {
+      this.client.emit(Constants.Events.MESSAGE_REACTION_REMOVE, reaction, user);
+    }
+
+    return {
+      message,
+      reaction,
+      user,
+    };
+  }
+}
+
+module.exports = MessageReactionRemove;

src/client/rest/RESTMethods.js

@@ -1,6 +1,7 @@
 const Constants = require('../../util/Constants');
 const Collection = require('../../util/Collection');
 const splitMessage = require('../../util/SplitMessage');
+const parseEmoji = require('../../util/ParseEmoji');
 
 const requireStructure = name => require(`../../structures/${name}`);
 const User = requireStructure('User');
@@ -720,6 +721,36 @@ class RESTMethods {
         .catch(reject);
     });
   }
+
+  addMessageReaction(channelID, messageID, emoji) {
+    return new Promise((resolve, reject) => {
+      this.rest.makeRequest('put', Constants.Endpoints.selfMessageReaction(channelID, messageID, emoji), true)
+        .then(() => {
+          resolve(this.rest.client.actions.MessageReactionAdd.handle({
+            user_id: this.rest.client.user.id,
+            message_id: messageID,
+            emoji: parseEmoji(emoji),
+            channel_id: channelID,
+          }).reaction);
+        })
+        .catch(reject);
+    });
+  }
+
+  removeMessageReaction(channelID, messageID, emoji) {
+    return new Promise((resolve, reject) => {
+      this.rest.makeRequest('delete', Constants.Endpoints.selfMessageReaction(channelID, messageID, emoji), true)
+        .then(() => {
+          resolve(this.rest.client.actions.MessageReactionRemove.handle({
+            user_id: this.rest.client.user.id,
+            message_id: messageID,
+            emoji: parseEmoji(emoji),
+            channel_id: channelID,
+          }).reaction);
+        })
+        .catch(reject);
+    });
+  }
 }
 
 module.exports = RESTMethods;

src/client/websocket/packets/WebSocketPacketManager.js

@@ -44,6 +44,8 @@ class WebSocketPacketManager {
     this.register(Constants.WSEvents.GUILD_SYNC, 'GuildSync');
     this.register(Constants.WSEvents.RELATIONSHIP_ADD, 'RelationshipAdd');
     this.register(Constants.WSEvents.RELATIONSHIP_REMOVE, 'RelationshipRemove');
+    this.register(Constants.WSEvents.MESSAGE_REACTION_ADD, 'MessageReactionAdd');
+    this.register(Constants.WSEvents.MESSAGE_REACTION_REMOVE, 'MessageReactionRemove');
   }
 
   get client() {

src/client/websocket/packets/handlers/MessageReactionAdd.js

@@ -0,0 +1,11 @@
+const AbstractHandler = require('./AbstractHandler');
+
+class MessageReactionAddHandler extends AbstractHandler {
+  handle(packet) {
+    const client = this.packetManager.client;
+    const data = packet.d;
+    client.actions.MessageReactionAdd.handle(data);
+  }
+}
+
+module.exports = MessageReactionAddHandler;

src/client/websocket/packets/handlers/MessageReactionRemove.js

@@ -0,0 +1,11 @@
+const AbstractHandler = require('./AbstractHandler');
+
+class MessageReactionRemove extends AbstractHandler {
+  handle(packet) {
+    const client = this.packetManager.client;
+    const data = packet.d;
+    client.actions.MessageReactionRemove.handle(data);
+  }
+}
+
+module.exports = MessageReactionRemove;