nodejs 中koa框架下的微信公众号开发初始篇

var koa = require(‘koa‘),
  co = require(‘co‘),
  fs = require(‘fs‘),
  request = require(‘co-request‘);
var route = require(‘koa-route‘);
var WechatAPI = require(‘wechat-api‘);
var wechat = require(‘koa-wechat‘);

exports.init = function(app) {
  app.use(wechat({ token: ‘your token‘ }));
  app.use(route.post(‘/api/wechat‘, postFun));
}
//因为服务器多进程，故需要保存token到全局，其他参见wechat-api文档
var api = new WechatAPI(‘appid‘, ‘appsecret‘, function(callback) {
  // 传入一个获取全局token的方法
  fs.readFile(‘access_token.txt‘, ‘utf8‘, function(err, txt) {
    if (err) {
      return callback(err);
    }
    callback(null, JSON.parse(txt));
  });
}, function(token, callback) {
  // 请将token存储到全局，跨进程、跨机器级别的全局，比如写到数据库、redis等
  fs.writeFile(‘access_token.txt‘, JSON.stringify(token), callback);
});

var weixin = {
  appid: ‘appid‘,
  appsecret: ‘appsecret‘,
  prefix: ‘https://api.weixin.qq.com/cgi-bin/‘,
  mpPrefix: ‘https://mp.weixin.qq.com/cgi-bin/‘,
  fileServerPrefix: ‘http://file.api.weixin.qq.com/cgi-bin/‘,
  payPrefix: ‘https://api.weixin.qq.com/pay/‘,
  merchantPrefix: ‘https://api.weixin.qq.com/merchant/‘,
  customservicePrefix: ‘https://api.weixin.qq.com/customservice/‘
}
//这里是在最初的时候运行下创建一个‘access_token.txt，（因为在设置token为全局后总是不成功，怀疑初始化没有获取token）有更好的办法可以交流
function* getAccessToken() {
  console.log("getAccessToken start");
  var url = weixin.prefix + ‘token?grant_type=client_credential&appid=‘ + weixin.appid + ‘&secret=‘ + weixin.appsecret;
  var response = yield request.get(url);
  var result = JSON.parse(response.body);
  console.log(‘result‘, result);
  weixin.token = result.access_token;
  console.log("token", weixin.token);
  return weixin.token;
}

function* postFun(next) {
  console.log("**************postFun***********");
  var info = this.req.body
  console.log("postFun info", info);
  console.log("info raw", info.raw);
  if (info.type === ‘text‘) {
    if (info.raw.Content == ‘你好‘) {
      this.body = {
        content: ‘你好‘,
        type: ‘text‘
      }
    } else {
      this.body = {
        type: "music",
        content: {
          title: "什么都不说了,来段音乐吧",
          description: "一路上有你",
          musicUrl: "http://www.xxxxx.com/yilushangyouni.mp3",
          hqMusicUrl: "http://www/yilushangyouni.mp3",
          thumbMediaId: "thisThumbMediaId"
        }
      }
    }
  } else if (info.type === ‘event‘) {
    if (info.raw.Event === ‘subscribe‘) { //添加关注事件  
      console.log("用户：" + info.uid + "新添加了关注");
      this.body = {
        content: ‘你好,欢迎‘,
        type: ‘text‘
      };
    } else {
      console.log(‘event::‘, info.raw);
    }
  } else {
//经试验这个是有问题的，实际是没法播放的，估计是需要上传到微信服务器
    this.body = {
      type: "music",
      content: {
        title: "什么都不说了,来段音乐吧",
        description: "一路上有你",
        musicUrl: "http://sc.111ttt.com/up/mp3/239837/2DF7A5657F60BE1DEF33B8DC3EA42492.mp3",
        hqMusicUrl: "http://sc.111ttt.com/up/mp3/239837/2DF7A5657F60BE1DEF33B8DC3EA42492.mp3",
        thumbMediaId: "thisThumbMediaId"
      }
    }
  }
  console.log("************** postFun end ***********");
}
var menu = {
  "button": [{
    "name": "父按钮",
    "sub_button": [{
      "type": "view",
      "name": "子按钮",
      "url": "http://www."
    }, {
      "type": "view",
      "name": "子按钮",
      "url": "http://www."
    }, {
      "type": "view",
      "name": "子按钮",
      "url": "http:/"
    }]
  }, {
    "name": "父按钮",
    "sub_button": [{
      "type": "view",
      "name": "子按钮",
      "url": "http:"
    }, {
      "type": "view",
      "name": "子按钮",
      "url": "http:"
    }]
  }, {
    "name": "父按钮",
    "sub_button": [{
      "type": "view",
      "name": "关于我",
      "url": "http:"
    }, {
      "type": "view",
      "name": "遇到我",
      "url": "http:"
    }, {
      "type": "view",
      "name": "联系我们",
      "url": "http:"
    }]
  }]
}
//创建菜单函数，只为了试验有效性，更多API参考官方文档
function* appMenu() {
  console.log(‘appMenu start‘);
  yield api.createMenu(menu, function(err, result) {
    if (err) {
      throw err
    };
    console.log(‘appMenu‘, result);
  });
  console.log(‘appMenu end‘);
}
//只是为了试验而执行了一下，自己根据需要执行
co(appMenu());