-
-
Notifications
You must be signed in to change notification settings - Fork 980
/
index.js
491 lines (397 loc) · 11.6 KB
/
index.js
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
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
/*!
* express-session
* Copyright(c) 2010 Sencha Inc.
* Copyright(c) 2011 TJ Holowaychuk
* MIT Licensed
*/
/**
* Module dependencies.
*/
var cookie = require('cookie');
var debug = require('debug')('express-session');
var deprecate = require('depd')('express-session');
var uid = require('uid-safe').sync
, onHeaders = require('on-headers')
, crc32 = require('buffer-crc32')
, parse = require('url').parse
, signature = require('cookie-signature')
var Session = require('./session/session')
, MemoryStore = require('./session/memory')
, Cookie = require('./session/cookie')
, Store = require('./session/store')
// environment
var env = process.env.NODE_ENV;
/**
* Expose the middleware.
*/
exports = module.exports = session;
/**
* Expose constructors.
*/
exports.Store = Store;
exports.Cookie = Cookie;
exports.Session = Session;
exports.MemoryStore = MemoryStore;
/**
* Warning message for `MemoryStore` usage in production.
*/
var warning = 'Warning: connect.session() MemoryStore is not\n'
+ 'designed for a production environment, as it will leak\n'
+ 'memory, and will not scale past a single process.';
/**
* Node.js 0.8+ async implementation.
*/
/* istanbul ignore next */
var defer = typeof setImmediate === 'function'
? setImmediate
: function(fn){ process.nextTick(fn.bind.apply(fn, arguments)) }
/**
* Setup session store with the given `options`.
*
* See README.md for documentation of options and formatting.
*
* Session data is _not_ saved in the cookie itself, however cookies are used,
* so you must use the cookie-parser middleware _before_ `session()`.
* [https://github.com/expressjs/cookie-parser]
*
* @param {Object} options
* @return {Function} middleware
* @api public
*/
function session(options){
var options = options || {}
// name - previously "options.key"
, name = options.name || options.key || 'connect.sid'
, store = options.store || new MemoryStore
, cookie = options.cookie || {}
, trustProxy = options.proxy
, storeReady = true
, rollingSessions = options.rolling || false;
var resaveSession = options.resave;
var saveUninitializedSession = options.saveUninitialized;
var generateId = options.genid || generateSessionId;
if (typeof generateId !== 'function') {
throw new TypeError('genid option must be a function');
}
if (resaveSession === undefined) {
deprecate('undefined resave option; provide resave option');
resaveSession = true;
}
if (saveUninitializedSession === undefined) {
deprecate('undefined saveUninitialized option; provide saveUninitialized option');
saveUninitializedSession = true;
}
if (options.unset && options.unset !== 'destroy' && options.unset !== 'keep') {
throw new TypeError('unset option must be "destroy" or "keep"');
}
// TODO: switch to "destroy" on next major
var unsetDestroy = options.unset === 'destroy';
// notify user that this store is not
// meant for a production environment
if ('production' == env && store instanceof MemoryStore) {
console.warn(warning);
}
// generates the new session
store.generate = function(req){
req.sessionID = generateId(req);
req.session = new Session(req);
req.session.cookie = new Cookie(cookie);
};
store.on('disconnect', function(){ storeReady = false; });
store.on('connect', function(){ storeReady = true; });
if (!options.secret) {
deprecate('req.secret; provide secret option');
}
return function session(req, res, next) {
// self-awareness
if (req.session) return next();
// Handle connection as if there is no session if
// the store has temporarily disconnected etc
if (!storeReady) return debug('store is disconnected'), next();
// pathname mismatch
var originalPath = parse(req.originalUrl || req.url).pathname;
if (0 != originalPath.indexOf(cookie.path || '/')) return next();
// backwards compatibility for signed cookies
// req.secret is passed from the cookie parser middleware
var secret = options.secret || req.secret;
// ensure secret is available or bail
if (!secret) next(new Error('`secret` option required for sessions'));
var originalHash
, originalId;
// expose store
req.sessionStore = store;
// get the session ID from the cookie
var cookieId = req.sessionID = getcookie(req, name, secret);
// set-cookie
onHeaders(res, function(){
if (!req.session) {
debug('no session');
return;
}
var cookie = req.session.cookie;
// only send secure cookies via https
if (cookie.secure && !issecure(req, trustProxy)) {
debug('not secured');
return;
}
if (!shouldSetCookie(req)) {
return;
}
setcookie(res, name, req.sessionID, secret, cookie.data);
});
// proxy end() to commit the session
var _end = res.end;
var _write = res.write;
var ended = false;
res.end = function end(chunk, encoding) {
if (ended) {
return false;
}
ended = true;
var ret;
var sync = true;
if (chunk === undefined) {
chunk = '';
}
function writeend() {
if (sync) {
ret = _end.call(res, chunk, encoding);
sync = false;
return;
}
_end.call(res);
}
function writetop() {
if (!sync) {
return ret;
}
var contentLength = Number(res.getHeader('Content-Length'));
if (!isNaN(contentLength) && contentLength > 0) {
// measure chunk
chunk = !Buffer.isBuffer(chunk)
? new Buffer(chunk, encoding)
: chunk;
encoding = undefined;
if (chunk.length !== 0) {
debug('split response');
ret = _write.call(res, chunk.slice(0, chunk.length - 1));
chunk = chunk.slice(chunk.length - 1, chunk.length);
return ret;
}
}
ret = _write.call(res, chunk, encoding);
sync = false;
return ret;
}
if (shouldDestroy(req)) {
// destroy session
debug('destroying');
store.destroy(req.sessionID, function ondestroy(err) {
if (err) {
defer(next, err);
}
debug('destroyed');
writeend();
});
return writetop();
}
// no session to save
if (!req.session) {
debug('no session');
return _end.call(res, chunk, encoding);
}
req.session.resetMaxAge();
if (shouldSave(req)) {
debug('saving');
req.session.save(function onsave(err) {
if (err) {
defer(next, err);
}
debug('saved');
writeend();
});
return writetop();
}
return _end.call(res, chunk, encoding);
};
// generate the session
function generate() {
store.generate(req);
originalId = req.sessionID;
originalHash = hash(req.session);
}
// check if session has been modified
function isModified(sess) {
return originalHash != hash(sess) || originalId != sess.id;
}
// determine if session should be destroyed
function shouldDestroy(req) {
return req.sessionID && unsetDestroy && req.session == null;
}
// determine if session should be saved to store
function shouldSave(req) {
return cookieId != req.sessionID
? saveUninitializedSession || isModified(req.session)
: resaveSession || isModified(req.session);
}
// determine if cookie should be set on response
function shouldSetCookie(req) {
// in case of rolling session, always reset the cookie
if (rollingSessions) {
return true;
}
return cookieId != req.sessionID
? saveUninitializedSession || isModified(req.session)
: req.session.cookie.expires != null && isModified(req.session);
}
// generate a session if the browser doesn't send a sessionID
if (!req.sessionID) {
debug('no SID sent, generating session');
generate();
next();
return;
}
// generate the session object
debug('fetching %s', req.sessionID);
store.get(req.sessionID, function(err, sess){
// error handling
if (err) {
debug('error %j', err);
if ('ENOENT' == err.code) {
generate();
next();
} else {
next(err);
}
// no session
} else if (!sess) {
debug('no session found');
generate();
next();
// populate req.session
} else {
debug('session found');
store.createSession(req, sess);
originalId = req.sessionID;
originalHash = hash(sess);
next();
}
});
};
};
/**
* Generate a session ID for a new session.
*
* @return {String}
* @api private
*/
function generateSessionId(sess) {
return uid(24);
}
/**
* Get the session ID cookie from request.
*
* @return {string}
* @api private
*/
function getcookie(req, name, secret) {
var header = req.headers.cookie;
var raw;
var val;
// read from cookie header
if (header) {
var cookies = cookie.parse(header);
raw = cookies[name];
if (raw) {
if (raw.substr(0, 2) === 's:') {
val = signature.unsign(raw.slice(2), secret);
if (val === false) {
debug('cookie signature invalid');
val = undefined;
}
} else {
debug('cookie unsigned')
}
}
}
// back-compat read from cookieParser() signedCookies data
if (!val && req.signedCookies) {
val = req.signedCookies[name];
if (val) {
deprecate('cookie should be available in req.headers.cookie');
}
}
// back-compat read from cookieParser() cookies data
if (!val && req.cookies) {
raw = req.cookies[name];
if (raw) {
if (raw.substr(0, 2) === 's:') {
val = signature.unsign(raw.slice(2), secret);
if (val) {
deprecate('cookie should be available in req.headers.cookie');
}
if (val === false) {
debug('cookie signature invalid');
val = undefined;
}
} else {
debug('cookie unsigned')
}
}
}
return val;
}
/**
* Hash the given `sess` object omitting changes to `.cookie`.
*
* @param {Object} sess
* @return {String}
* @api private
*/
function hash(sess) {
return crc32.signed(JSON.stringify(sess, function(key, val){
if ('cookie' != key) return val;
}));
}
/**
* Determine if request is secure.
*
* @param {Object} req
* @param {Boolean} [trustProxy]
* @return {Boolean}
* @api private
*/
function issecure(req, trustProxy) {
// socket is https server
if (req.connection && req.connection.encrypted) {
return true;
}
// do not trust proxy
if (trustProxy === false) {
return false;
}
// no explicit trust; try req.secure from express
if (trustProxy !== true) {
var secure = req.secure;
return typeof secure === 'boolean'
? secure
: false;
}
// read the proto from x-forwarded-proto header
var header = req.headers['x-forwarded-proto'] || '';
var index = header.indexOf(',');
var proto = index !== -1
? header.substr(0, index).toLowerCase().trim()
: header.toLowerCase().trim()
return proto === 'https';
}
function setcookie(res, name, val, secret, options) {
var signed = 's:' + signature.sign(val, secret);
var data = cookie.serialize(name, signed, options);
debug('set-cookie %s', data);
var prev = res.getHeader('set-cookie') || [];
var header = Array.isArray(prev) ? prev.concat(data)
: Array.isArray(data) ? [prev].concat(data)
: [prev, data];
res.setHeader('set-cookie', header)
}