This file is indexed.

/usr/lib/nodejs/express/application.js is in node-express 4.1.1~dfsg-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
/**
 * Module dependencies.
 */

var mixin = require('utils-merge');
var escapeHtml = require('escape-html');
var Router = require('./router');
var methods = require('methods');
var middleware = require('./middleware/init');
var query = require('./middleware/query');
var debug = require('debug')('express:application');
var View = require('./view');
var http = require('http');

/**
 * Application prototype.
 */

var app = exports = module.exports = {};

/**
 * Initialize the server.
 *
 *   - setup default configuration
 *   - setup default middleware
 *   - setup route reflection methods
 *
 * @api private
 */

app.init = function(){
  this.cache = {};
  this.settings = {};
  this.engines = {};
  this.defaultConfiguration();
};

/**
 * Initialize application configuration.
 *
 * @api private
 */

app.defaultConfiguration = function(){
  // default settings
  this.enable('x-powered-by');
  this.enable('etag');
  var env = process.env.NODE_ENV || 'development';
  this.set('env', env);
  this.set('subdomain offset', 2);

  debug('booting in %s mode', env);

  // inherit protos
  this.on('mount', function(parent){
    this.request.__proto__ = parent.request;
    this.response.__proto__ = parent.response;
    this.engines.__proto__ = parent.engines;
    this.settings.__proto__ = parent.settings;
  });

  // setup locals
  this.locals = Object.create(null);

  // top-most app is mounted at /
  this.mountpath = '/';

  // default locals
  this.locals.settings = this.settings;

  // default configuration
  this.set('view', View);
  this.set('views', process.cwd() + '/views');
  this.set('jsonp callback name', 'callback');

  if (env === 'production') {
    this.enable('view cache');
  }

  Object.defineProperty(this, 'router', {
    get: function() {
      throw new Error('\'app.router\' is deprecated!\nPlease see the 3.x to 4.x migration guide for details on how to update your app.');
    }
  });
};

/**
 * lazily adds the base router if it has not yet been added.
 *
 * We cannot add the base router in the defaultConfiguration because
 * it reads app settings which might be set after that has run.
 *
 * @api private
 */
app.lazyrouter = function() {
  if (!this._router) {
    this._router = new Router({
      caseSensitive: this.enabled('case sensitive routing'),
      strict: this.enabled('strict routing')
    });

    this._router.use(query());
    this._router.use(middleware.init(this));
  }
};

/**
 * Dispatch a req, res pair into the application. Starts pipeline processing.
 *
 * If no _done_ callback is provided, then default error handlers will respond
 * in the event of an error bubbling through the stack.
 *
 * @api private
 */

app.handle = function(req, res, done) {
  var env = this.get('env');

  this._router.handle(req, res, function(err) {
    if (done) {
      return done(err);
    }

    // unhandled error
    if (err) {
      // default to 500
      if (res.statusCode < 400) res.statusCode = 500;
      debug('default %s', res.statusCode);

      // respect err.status
      if (err.status) res.statusCode = err.status;

      // production gets a basic error message
      var msg = 'production' == env
        ? http.STATUS_CODES[res.statusCode]
        : err.stack || err.toString();
      msg = escapeHtml(msg);

      // log to stderr in a non-test env
      if ('test' != env) console.error(err.stack || err.toString());
      if (res.headersSent) return req.socket.destroy();
      res.setHeader('Content-Type', 'text/html');
      res.setHeader('Content-Length', Buffer.byteLength(msg));
      if ('HEAD' == req.method) return res.end();
      res.end(msg);
      return;
    }

    // 404
    debug('default 404');
    res.statusCode = 404;
    res.setHeader('Content-Type', 'text/html');
    if ('HEAD' == req.method) return res.end();
    res.end('Cannot ' + escapeHtml(req.method) + ' ' + escapeHtml(req.originalUrl) + '\n');
  });
};

/**
 * Proxy `Router#use()` to add middleware to the app router.
 * See Router#use() documentation for details.
 *
 * If the _fn_ parameter is an express app, then it will be
 * mounted at the _route_ specified.
 *
 * @param {String|Function|Server} route
 * @param {Function|Server} fn
 * @return {app} for chaining
 * @api public
 */

app.use = function(route, fn){
  var mount_app;

  // default route to '/'
  if ('string' != typeof route) fn = route, route = '/';

  // express app
  if (fn.handle && fn.set) mount_app = fn;

  // restore .app property on req and res
  if (mount_app) {
    debug('.use app under %s', route);
    mount_app.mountpath = route;
    fn = function(req, res, next) {
      var orig = req.app;
      mount_app.handle(req, res, function(err) {
        req.__proto__ = orig.request;
        res.__proto__ = orig.response;
        next(err);
      });
    };
  }

  this.lazyrouter();
  this._router.use(route, fn);

  // mounted an app
  if (mount_app) {
    mount_app.parent = this;
    mount_app.emit('mount', this);
  }

  return this;
};

/**
 * Proxy to the app `Router#route()`
 * Returns a new `Route` instance for the _path_.
 *
 * Routes are isolated middleware stacks for specific paths.
 * See the Route api docs for details.
 *
 * @api public
 */

app.route = function(path){
  this.lazyrouter();
  return this._router.route(path);
};

/**
 * Register the given template engine callback `fn`
 * as `ext`.
 *
 * By default will `require()` the engine based on the
 * file extension. For example if you try to render
 * a "foo.jade" file Express will invoke the following internally:
 *
 *     app.engine('jade', require('jade').__express);
 *
 * For engines that do not provide `.__express` out of the box,
 * or if you wish to "map" a different extension to the template engine
 * you may use this method. For example mapping the EJS template engine to
 * ".html" files:
 *
 *     app.engine('html', require('ejs').renderFile);
 *
 * In this case EJS provides a `.renderFile()` method with
 * the same signature that Express expects: `(path, options, callback)`,
 * though note that it aliases this method as `ejs.__express` internally
 * so if you're using ".ejs" extensions you dont need to do anything.
 *
 * Some template engines do not follow this convention, the
 * [Consolidate.js](https://github.com/visionmedia/consolidate.js)
 * library was created to map all of node's popular template
 * engines to follow this convention, thus allowing them to
 * work seamlessly within Express.
 *
 * @param {String} ext
 * @param {Function} fn
 * @return {app} for chaining
 * @api public
 */

app.engine = function(ext, fn){
  if ('function' != typeof fn) throw new Error('callback function required');
  if ('.' != ext[0]) ext = '.' + ext;
  this.engines[ext] = fn;
  return this;
};

/**
 * Proxy to `Router#param()` with one added api feature. The _name_ parameter
 * can be an array of names.
 *
 * See the Router#param() docs for more details.
 *
 * @param {String|Array} name
 * @param {Function} fn
 * @return {app} for chaining
 * @api public
 */

app.param = function(name, fn){
  var self = this;
  self.lazyrouter();

  if (Array.isArray(name)) {
    name.forEach(function(key) {
      self.param(key, fn);
    });
    return this;
  }

  self._router.param(name, fn);
  return this;
};

/**
 * Assign `setting` to `val`, or return `setting`'s value.
 *
 *    app.set('foo', 'bar');
 *    app.get('foo');
 *    // => "bar"
 *
 * Mounted servers inherit their parent server's settings.
 *
 * @param {String} setting
 * @param {*} [val]
 * @return {Server} for chaining
 * @api public
 */

app.set = function(setting, val){
  if (1 == arguments.length) {
    return this.settings[setting];
  } else {
    this.settings[setting] = val;
    return this;
  }
};

/**
 * Return the app's absolute pathname
 * based on the parent(s) that have
 * mounted it.
 *
 * For example if the application was
 * mounted as "/admin", which itself
 * was mounted as "/blog" then the
 * return value would be "/blog/admin".
 *
 * @return {String}
 * @api private
 */

app.path = function(){
  return this.parent
    ? this.parent.path() + this.mountpath
    : '';
};

/**
 * Check if `setting` is enabled (truthy).
 *
 *    app.enabled('foo')
 *    // => false
 *
 *    app.enable('foo')
 *    app.enabled('foo')
 *    // => true
 *
 * @param {String} setting
 * @return {Boolean}
 * @api public
 */

app.enabled = function(setting){
  return !!this.set(setting);
};

/**
 * Check if `setting` is disabled.
 *
 *    app.disabled('foo')
 *    // => true
 *
 *    app.enable('foo')
 *    app.disabled('foo')
 *    // => false
 *
 * @param {String} setting
 * @return {Boolean}
 * @api public
 */

app.disabled = function(setting){
  return !this.set(setting);
};

/**
 * Enable `setting`.
 *
 * @param {String} setting
 * @return {app} for chaining
 * @api public
 */

app.enable = function(setting){
  return this.set(setting, true);
};

/**
 * Disable `setting`.
 *
 * @param {String} setting
 * @return {app} for chaining
 * @api public
 */

app.disable = function(setting){
  return this.set(setting, false);
};

/**
 * Delegate `.VERB(...)` calls to `router.VERB(...)`.
 */

methods.forEach(function(method){
  app[method] = function(path){
    if ('get' == method && 1 == arguments.length) return this.set(path);

    this.lazyrouter();

    var route = this._router.route(path);
    route[method].apply(route, [].slice.call(arguments, 1));
    return this;
  };
});

/**
 * Special-cased "all" method, applying the given route `path`,
 * middleware, and callback to _every_ HTTP method.
 *
 * @param {String} path
 * @param {Function} ...
 * @return {app} for chaining
 * @api public
 */

app.all = function(path){
  this.lazyrouter();

  var route = this._router.route(path);
  var args = [].slice.call(arguments, 1);
  methods.forEach(function(method){
    route[method].apply(route, args);
  });

  return this;
};

// del -> delete alias

app.del = app.delete;

/**
 * Render the given view `name` name with `options`
 * and a callback accepting an error and the
 * rendered template string.
 *
 * Example:
 *
 *    app.render('email', { name: 'Tobi' }, function(err, html){
 *      // ...
 *    })
 *
 * @param {String} name
 * @param {String|Function} options or fn
 * @param {Function} fn
 * @api public
 */

app.render = function(name, options, fn){
  var opts = {};
  var cache = this.cache;
  var engines = this.engines;
  var view;

  // support callback function as second arg
  if ('function' == typeof options) {
    fn = options, options = {};
  }

  // merge app.locals
  mixin(opts, this.locals);

  // merge options._locals
  if (options._locals) mixin(opts, options._locals);

  // merge options
  mixin(opts, options);

  // set .cache unless explicitly provided
  opts.cache = null == opts.cache
    ? this.enabled('view cache')
    : opts.cache;

  // primed cache
  if (opts.cache) view = cache[name];

  // view
  if (!view) {
    view = new (this.get('view'))(name, {
      defaultEngine: this.get('view engine'),
      root: this.get('views'),
      engines: engines
    });

    if (!view.path) {
      var err = new Error('Failed to lookup view "' + name + '" in views directory "' + view.root + '"');
      err.view = view;
      return fn(err);
    }

    // prime the cache
    if (opts.cache) cache[name] = view;
  }

  // render
  try {
    view.render(opts, fn);
  } catch (err) {
    fn(err);
  }
};

/**
 * Listen for connections.
 *
 * A node `http.Server` is returned, with this
 * application (which is a `Function`) as its
 * callback. If you wish to create both an HTTP
 * and HTTPS server you may do so with the "http"
 * and "https" modules as shown here:
 *
 *    var http = require('http')
 *      , https = require('https')
 *      , express = require('express')
 *      , app = express();
 *
 *    http.createServer(app).listen(80);
 *    https.createServer({ ... }, app).listen(443);
 *
 * @return {http.Server}
 * @api public
 */

app.listen = function(){
  var server = http.createServer(this);
  return server.listen.apply(server, arguments);
};