added reaction methods

README.md

@@ -47,6 +47,10 @@ npm install slackbots
 - `postMessageToUser(name, message [, params, callback])` (return: promise) - posts a direct message by user name,
 - `postMessageToGroup(name, message [, params, callback])` (return: promise) - posts a message to private group by name,
 - `postMessageToChannel(name, message [, params, callback])` (return: promise) - posts a message to channel by name.
+- `postReactionToChannel(channel, emoji, timestamp [, params, callback])` (return: promise) - posts a reaction (emoji) to a channel's message by timestamp.
+- `removeReactionFromChannel(channel, emoji, timestamp [, params, callback])` (return: promise) - removes a reaction (emoji) from a channel's message by timestamp.
+- `getReactions(channel, timestamp [, params, callback])` (return: promise) - returns a list of all reactions for a message by timestamp.
+- `listReactions(user [, params, callback])` (return: promise) - returns a list of all items reacted to by a user.
 - `openIm(userId)` (return: promise) - opens a direct message channel with another member in the team
 
 ## Usage

index.js

@@ -422,6 +422,72 @@ class Bot extends EventEmitter {
         }.bind(this));
     }
 
+    /**
+     * Posts a reaction (emoji) to a message by timestamp
+     * @param {string} id - channel ID
+     * @param {string} emoji - emoji string (without the : symbols)
+     * @param {string} ts - timestamp
+     * @param {object} params
+     * @returns {vow.Promise}
+     */
+    postReactionToChannel(id, emoji, ts, params) {
+        params = extend({
+            channel: id,
+            name: emoji,
+            timestamp: ts
+        }, params || {});
+
+        return this._api('reactions.add', params);
+    };
+
+    /**
+     * Removes a reaction (emoji) by timestamp
+     * @param {string} id - channel ID
+     * @param {string} emoji - emoji string (without the : symbols)
+     * @param {string} ts - timestamp
+     * @param {object} params
+     * @returns {vow.Promise}
+     */
+    removeReactionFromChannel(id, emoji, ts, params) {
+        params = extend({
+            channel: id,
+            name: emoji,
+            timestamp: ts
+        }, params || {});
+
+        return this._api('reactions.remove', params);
+    };
+
+    /**
+     * Returns a list of all reactions for a message by timestamp
+     * @param {string} id - channel ID
+     * @param {string} ts - timestamp of the message
+     * @param {object} params
+     * @returns {vow.Promise}
+     */
+    getReactions(id, ts, params) {
+        params = extend({
+            channel: id,
+            timestamp: ts
+        }, params || {});
+
+        return this._api('reactions.get', params);
+    };
+
+    /**
+     * Returns a list of all items reacted to by a user
+     * @param {string} id - user ID
+     * @param {object} params
+     * @returns {vow.Promise}
+     */
+    listReactions(id, ts, params) {
+        params = extend({
+            user: id
+        }, params || {});
+
+        return this._api('reactions.list', params);
+    };
+
     /**
      * Remove @ or # character from group | channel | user name
      * @param {string} name