详解nodejs微信公众号开发——3.封装消息响应模块

'use strict'

var ejs = require('ejs');
var heredoc = require('heredoc');

var tpl = heredoc(function(content){/*
  <xml>
    <ToUserName><![CDATA[<%= toUserName %>]]></ToUserName>
    <FromUserName><![CDATA[<%= fromUserName %>]]></FromUserName>
    <CreateTime><%= createTime%></CreateTime>
    <MsgType><![CDATA[<%= msgType %>]]></MsgType>
    <% if(msgType ==='text') { %>
      <Content><![CDATA[<%= content %>]]></Content>
    <% }else if(msgType ==='image'){ %>
      <Image>
        <MediaId><![CDATA[<%= content.mediaId %>]]></MediaId>
      </Image>
    <% }else if(msgType ==='voice'){ %>
      <Voice>
        <MediaId><![CDATA[<%= content.mediaId %>]]></MediaId>
      </Voice>
    <% } %>else if(msgType ==='video'){ %>
      <Video>
        <MediaId><![CDATA[<%= content.mediaId %>]]></MediaId>
        <Title><![CDATA[<%= content.title %>]]></Title>
        <Description><![CDATA[<%= content.description %>]]></Description>
      </Video>   
    <% } %>else if(msgType ==='music'){ %>
      <Music>
        <Title><![CDATA[<%= content.title %>]]></Title>
        <Description><![CDATA[<%= content.description %>]]></Description>
        <MusicUrl><![CDATA[<%= content.musicUrl %>]]></MusicUrl>
        <HQMusicUrl><![CDATA[<%= content.hqMusicUrl %>]]></HQMusicUrl>
        <ThumbMediaId><![CDATA[<%= content.thumbMediaId %>]]></ThumbMediaId>  
      </Music>
    <% } %>else if(msgType ==='news'){ %>
      <ArticleCount><%= content.length %></ArticleCount>
      <Articles>
        <% content.forEach(function(item){ %>
        <item>
          <Title><![CDATA[<%= item.title %>]]></Title> 
          <Description><![CDATA[<%= item.description %>]]></Description>
          <PicUrl><![CDATA[<%= item.picUrl %>]]></PicUrl>
          <Url><![CDATA[<%= item.url %>]]></Url>
        </item>
        <% }) %>
      </Articles>
    <% } %>  
  </xml>
*/});

var compiled = ejs.compiled(tpl);

exports = module.exports = {
  compiled:compiled
};

var message = util.formatMessage(content.xml);
    
this.weixin = message; //挂载消息

yield handler.call(this,next);  //转到业务层逻辑

wechat.replay.call(this); //真正回复

var weixin = require('./weixin');
...
app.use(wechat(config.wechat,weixin.reply)); 

exports.reply = function* (next){
  var message = this.weixin;

  if(message.magType === 'event'){
    if(message.Event === 'subscribe'){
      if(message.EventKey) console.log('扫描二维码关注：'+message.EventKey+' '+message.ticket);
      this.body = '终于等到你，还好我没放弃';
    }else if(message.Event === 'unsubscribe'){
      console.log(message.FromUserName +' 悄悄地走了...');
    }
  }else{
    //
  }

  yield next;
}

Wechat.prototype.replay = function(){
  var content = this.body;
  var message = this.weixin;

  var xml = util.tpl(content,message);

  this.status = 200;
  this.type = 'application/xml';
  this.body = xml;
}