| 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412 | 2
2
2
2
2
2
2
2
2
2
23
23
22
23
22
23
2
37
37
36
175
175
175
175
37
2
25
25
25
25
1
24
7
6
6
1
25
25
25
25
25
2
8
18
18
18
16
16
16
16
16
16
16
16
16
18
18
7
7
7
2
1
1
7
5
18
4
14
18
16
16
16
16
16
16
15
16
3
3
2
2
1
1
1
1
1
16
1
1
16
16
4
4
12
16
2
2
8
8
8
2
15
15
2
14
15
2
18
2
8
8
8
8
8
23
23
23
23
23
2
2
1
1
1
1
1
1
21
21
21
21
21
1
1
1
20
20
1
1
19
19
19
1
1
1
18
18
18
18
18
18
18
18
2
8
1
7
7
4
4
3
2
14
4
2
2
2
2
2
| var xml2js = require('xml2js');
var ejs = require('ejs');
var Session = require('./session');
var List = require('./list');
var WXBizMsgCrypt = require('./msg_crypto');
/*!
* 响应模版
*/
var tpl = ['<xml>',
'<ToUserName><![CDATA[<%-toUsername%>]]></ToUserName>',
'<FromUserName><![CDATA[<%-fromUsername%>]]></FromUserName>',
'<CreateTime><%=createTime%></CreateTime>',
'<MsgType><![CDATA[<%=msgType%>]]></MsgType>',
'<% 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 || item.picurl || item.pic %>]]></PicUrl>',
'<Url><![CDATA[<%-item.url%>]]></Url>',
'</item>',
'<% }); %>',
'</Articles>',
'<% } else if (msgType === "music") { %>',
'<Music>',
'<Title><![CDATA[<%-content.title%>]]></Title>',
'<Description><![CDATA[<%-content.description%>]]></Description>',
'<MusicUrl><![CDATA[<%-content.musicUrl || content.url %>]]></MusicUrl>',
'<HQMusicUrl><![CDATA[<%-content.hqMusicUrl || content.hqUrl %>]]></HQMusicUrl>',
'</Music>',
'<% } else if (msgType === "voice") { %>',
'<Voice>',
'<MediaId><![CDATA[<%-content.mediaId%>]]></MediaId>',
'</Voice>',
'<% } else if (msgType === "image") { %>',
'<Image>',
'<MediaId><![CDATA[<%-content.mediaId%>]]></MediaId>',
'</Image>',
'<% } else if (msgType === "video") { %>',
'<Video>',
'<MediaId><![CDATA[<%-content.mediaId%>]]></MediaId>',
'<Title><![CDATA[<%-content.title%>]]></Title>',
'<Description><![CDATA[<%-content.description%>]]></Description>',
'</Video>',
'<% } else if (msgType === "transfer_customer_service") { %>',
'<% if (content && content.kfAccount) { %>',
'<TransInfo>',
'<KfAccount><![CDATA[<%-content.kfAccount%>]]></KfAccount>',
'</TransInfo>',
'<% } %>',
'<% } else { %>',
'<Content><![CDATA[<%-content%>]]></Content>',
'<% } %>',
'</xml>'].join('');
/*!
* 编译过后的模版
*/
var compiled = ejs.compile(tpl);
var wrapTpl = '<xml>' +
'<Encrypt><![CDATA[<%-encrypt%>]]></Encrypt>' +
'<MsgSignature><![CDATA[<%-signature%>]]></MsgSignature>' +
'<TimeStamp><%-timestamp%></TimeStamp>' +
'<Nonce><![CDATA[<%-nonce%>]]></Nonce>' +
'</xml>';
var encryptWrap = ejs.compile(wrapTpl);
var load = function (stream, callback) {
var buffers = [];
stream.on('data', function (trunk) {
buffers.push(trunk);
});
stream.on('end', function () {
callback(null, Buffer.concat(buffers));
});
stream.once('error', callback);
};
/*!
* 将xml2js解析出来的对象转换成直接可访问的对象
*/
var formatMessage = function (result) {
var message = {};
if (typeof result === 'object') {
for (var key in result) {
Eif (result[key].length === 1) {
var val = result[key][0];
Iif (typeof val === 'object') {
message[key] = formatMessage(val);
} else {
message[key] = (val || '').trim();
}
} else {
message = result[key].map(formatMessage);
}
}
}
return message;
};
/*!
* 将回复消息封装成xml格式
*/
var reply = function (content, fromUsername, toUsername) {
var info = {};
var type = 'text';
info.content = content || '';
if (Array.isArray(content)) {
type = 'news';
} else if (typeof content === 'object') {
if (content.hasOwnProperty('type')) {
type = content.type;
info.content = content.content;
} else {
type = 'music';
}
}
info.msgType = type;
info.createTime = new Date().getTime();
info.toUsername = toUsername;
info.fromUsername = fromUsername;
return compiled(info);
};
var respond = function (handler) {
return function (req, res, next) {
var message = req.weixin;
var callback = handler.getHandler(message.MsgType);
res.reply = function (content) {
res.writeHead(200);
// 响应空字符串，用于响应慢的情况，避免微信重试
Iif (!content) {
return res.end();
}
var xml = reply(content, message.ToUserName, message.FromUserName);
var wrap = {};
wrap.encrypt = handler.cryptor.encrypt(xml);
wrap.nonce = parseInt((Math.random() * 100000000000), 10);
wrap.timestamp = new Date().getTime();
wrap.signature = handler.cryptor.getSignature(wrap.timestamp, wrap.nonce, wrap.encrypt);
res.end(encryptWrap(wrap));
};
var done = function () {
// 如果session中有_wait标记
if (message.MsgType === 'text' && req.wxsession && req.wxsession._wait) {
var list = List.get(req.wxsession._wait);
var handle = list.get(message.Content);
var wrapper = function (message) {
return handler.handle ? function(req, res) {
res.reply(message);
} : function (info, req, res) {
res.reply(message);
};
};
// 如果回复命中规则，则用预置的方法回复
if (handle) {
callback = typeof handle === 'string' ? wrapper(handle) : handle;
}
}
// 兼容旧API
if (handler.handle) {
callback(req, res, next);
} else {
callback(message, req, res, next);
}
};
if (req.sessionStore) {
var storage = req.sessionStore;
var _end = res.end;
var openid = message.FromUserName + ':' + message.ToUserName;
res.end = function () {
_end.apply(res, arguments);
if (req.wxsession) {
req.wxsession.save();
}
};
// 等待列表
res.wait = function (name, callback) {
var list = List.get(name);
if (list) {
req.wxsession._wait = name;
res.reply(list.description);
} else {
var err = new Error('Undefined list: ' + name);
err.name = 'UndefinedListError';
res.writeHead(500);
res.end(err.name);
callback && callback(err);
}
};
// 清除等待列表
res.nowait = function () {
delete req.wxsession._wait;
res.reply.apply(res, arguments);
};
storage.get(openid, function (err, session) {
if (!session) {
req.wxsession = new Session(openid, req);
req.wxsession.cookie = req.session.cookie;
} else {
req.wxsession = new Session(openid, req, session);
}
done();
});
} else {
done();
}
};
};
/**
* 微信自动回复平台的内部的Handler对象
* @param {Object} config 企业号的开发者配置对象
* @param {Function} handle handle对象
*
* config:
* ```
* {
* token: '', // 公众平台上，开发者设置的Token
* encodingAESKey: '', // 公众平台上，开发者设置的EncodingAESKey
* corpId: '', // 企业号的CorpId
* }
* ```
*/
var Handler = function (config, handle) {
this.config = config;
this.handlers = {};
this.handle = handle;
};
/**
* 设置handler对象
* 按消息设置handler对象的快捷方式
*
* - `text(fn)`
* - `image(fn)`
* - `voice(fn)`
* - `video(fn)`
* - `location(fn)`
* - `link(fn)`
* - `event(fn)`
* @param {String} type handler处理的消息类型
* @param {Function} handle handle对象
*/
Handler.prototype.setHandler = function (type, fn) {
this.handlers[type] = fn;
return this;
};
['text', 'image', 'voice', 'video', 'location', 'link', 'event'].forEach(function (method) {
Handler.prototype[method] = function (fn) {
return this.setHandler(method, fn);
};
});
/**
* 根据消息类型取出handler对象
* @param {String} type 消息类型
*/
Handler.prototype.getHandler = function (type) {
return this.handle || this.handlers[type] || function (info, req, res, next) {
next();
};
};
/**
* 根据Handler对象生成响应方法，并最终生成中间件函数
*/
Handler.prototype.middlewarify = function () {
var that = this;
var config = this.config;
that.cryptor = new WXBizMsgCrypt(config.token, config.encodingAESKey, config.corpId);
var _respond = respond(this);
return function (req, res, next) {
var method = req.method;
var signature = req.query.msg_signature;
var timestamp = req.query.timestamp;
var nonce = req.query.nonce;
if (method === 'GET') {
var echostr = req.query.echostr;
if (signature !== that.cryptor.getSignature(timestamp, nonce, echostr)) {
res.writeHead(401);
res.end('Invalid signature');
return;
}
var result = that.cryptor.decrypt(echostr);
// TODO 检查corpId的正确性
res.writeHead(200);
res.end(result.message);
} else Eif (method === 'POST') {
load(req, function (err, buf) {
Iif (err) {
return next(err);
}
var xml = buf.toString('utf-8');
if (!xml) {
var emptyErr = new Error('body is empty');
emptyErr.name = 'Wechat';
return next(emptyErr);
}
xml2js.parseString(xml, {trim: true}, function (err, result) {
if (err) {
err.name = 'BadMessage' + err.name;
return next(err);
}
var xml = formatMessage(result.xml);
var encryptMessage = xml.Encrypt;
if (signature !== that.cryptor.getSignature(timestamp, nonce, encryptMessage)) {
res.writeHead(401);
res.end('Invalid signature');
return;
}
var decrypted = that.cryptor.decrypt(encryptMessage);
var messageWrapXml = decrypted.message;
Iif (messageWrapXml === '') {
res.writeHead(401);
res.end('Invalid corpid');
return;
}
req.weixin_xml = messageWrapXml;
xml2js.parseString(messageWrapXml, {trim: true}, function (err, result) {
Iif (err) {
err.name = 'BadMessage' + err.name;
return next(err);
}
req.weixin = formatMessage(result.xml);
_respond(req, res, next);
});
});
});
} else {
res.writeHead(501);
res.end('Not Implemented');
}
};
};
/**
* 根据口令
*
* Examples:
* 使用wechat作为自动回复中间件的三种方式
* ```
* wechat(config, function (req, res, next) {});
*
* wechat(config, wechat.text(function (message, req, res, next) {
* // TODO
* }).location(function (message, req, res, next) {
* // TODO
* }));
*
* wechat(config)
* .text(function (message, req, res, next) {
* // TODO
* }).location(function (message, req, res, next) {
* // TODO
* }).middleware();
* ```
* 静态方法
*
* - `text`，处理文字推送的回调函数，接受参数为(text, req, res, next)。
* - `image`，处理图片推送的回调函数，接受参数为(image, req, res, next)。
* - `voice`，处理声音推送的回调函数，接受参数为(voice, req, res, next)。
* - `video`，处理视频推送的回调函数，接受参数为(video, req, res, next)。
* - `location`，处理位置推送的回调函数，接受参数为(location, req, res, next)。
* - `link`，处理链接推送的回调函数，接受参数为(link, req, res, next)。
* - `event`，处理事件推送的回调函数，接受参数为(event, req, res, next)。
* @param {Object} config 企业号的开发者配置对象
* @param {Function} handle 生成的回调函数，参见示例
*/
var middleware = function (config, handle) {
if (arguments.length === 1) {
return new Handler(config);
}
Eif (arguments.length === 2) {
if (handle instanceof Handler) {
handle.config = config;
return handle.middlewarify();
} else {
return new Handler(config, handle).middlewarify();
}
}
};
['text', 'image', 'voice', 'video', 'location', 'link', 'event'].forEach(function (method) {
middleware[method] = function (fn) {
return (new Handler())[method](fn);
};
});
middleware.reply = reply;
middleware.encryptWrap = encryptWrap;
middleware.toXML = compiled;
middleware.WXBizMsgCrypt = WXBizMsgCrypt;
module.exports = middleware;
|