[new]新增sendMpNews接口

Author: 黄志东

lib/api_message.js

@@ -201,7 +201,7 @@ exports.sendMusic = function* (openid, music) {
 };
 
 /**
- * 客服消息，发送图文消息
+ * 客服消息，发送图文消息（点击跳转到外链）
  * 详细细节 http://mp.weixin.qq.com/wiki/index.php?title=发送客服消息
  * Examples:
  * ```
@@ -256,6 +256,34 @@ exports.sendNews = function* (openid, articles) {
   return yield this.request(url, postJSON(data));
 };
 
+/**
+ * 客服消息，发送图文消息（点击跳转到图文消息页面）
+ * 详细细节 http://mp.weixin.qq.com/wiki/14/d9be34fe03412c92517da10a5980e7ee.html#.E5.AE.A2.E6.9C.8D.E6.8E.A5.E5.8F.A3-.E5.8F.91.E6.B6.88.E6.81.AF
+ * Examples:
+ * ```
+ * api.sendMpNews('openid', 'mediaId');
+ * ```
+ * Callback:
+ *
+ * - `err`, 调用失败时得到的异常
+ * - `result`, 调用正常时得到的对象
+ *
+ * @param {String} openid 用户的openid
+ * @param {String} mediaId 图文素材id
+ */
+exports.sendMpNews = function* (openid, mediaId) {
+  var token = yield this.ensureAccessToken();
+  var url = this.prefix + 'message/custom/send?access_token=' + token.accessToken;
+  var data = {
+    'touser': openid,
+    'msgtype':'mpnews',
+    'mpnews': {
+      'media_id': mediaId
+    }
+  };
+  return yield this.request(url, postJSON(data));
+};
+
  /**
  * 获取自动回复规则
  * 详细请看：<http://mp.weixin.qq.com/wiki/19/ce8afc8ae7470a0d7205322f46a02647.html>