| 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 | 1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
| var CombinedStream = require('combined-stream');
var util = require('util');
var path = require('path');
var http = require('http');
var https = require('https');
var parseUrl = require('url').parse;
var fs = require('fs');
var mime = require('mime-types');
var async = require('async');
var populate = require('./populate.js');
// Public API
module.exports = FormData;
// make it a Stream
util.inherits(FormData, CombinedStream);
/**
* Create readable "multipart/form-data" streams.
* Can be used to submit forms
* and file uploads to other web applications.
*
* @constructor
*/
function FormData() {
if (!(this instanceof FormData)) {
throw new TypeError('Failed to construct FormData: Please use the _new_ operator, this object constructor cannot be called as a function.');
}
this._overheadLength = 0;
this._valueLength = 0;
this._lengthRetrievers = [];
CombinedStream.call(this);
}
FormData.LINE_BREAK = '\r\n';
FormData.DEFAULT_CONTENT_TYPE = 'application/octet-stream';
FormData.prototype.append = function(field, value, options) {
options = options || {};
// allow filename as single option
if (typeof options == 'string') {
options = {filename: options};
}
var append = CombinedStream.prototype.append.bind(this);
// all that streamy business can't handle numbers
if (typeof value == 'number') {
value = '' + value;
}
// https://github.com/felixge/node-form-data/issues/38
if (util.isArray(value)) {
// Please convert your array into string
// the way web server expects it
this._error(new Error('Arrays are not supported.'));
return;
}
var header = this._multiPartHeader(field, value, options);
var footer = this._multiPartFooter();
append(header);
append(value);
append(footer);
// pass along options.knownLength
this._trackLength(header, value, options);
};
FormData.prototype._trackLength = function(header, value, options) {
var valueLength = 0;
// used w/ getLengthSync(), when length is known.
// e.g. for streaming directly from a remote server,
// w/ a known file a size, and not wanting to wait for
// incoming file to finish to get its size.
if (options.knownLength != null) {
valueLength += +options.knownLength;
} else if (Buffer.isBuffer(value)) {
valueLength = value.length;
} else if (typeof value === 'string') {
valueLength = Buffer.byteLength(value);
}
this._valueLength += valueLength;
// @check why add CRLF? does this account for custom/multiple CRLFs?
this._overheadLength +=
Buffer.byteLength(header) +
FormData.LINE_BREAK.length;
// empty or either doesn't have path or not an http response
if (!value || ( !value.path && !(value.readable && value.hasOwnProperty('httpVersion')) )) {
return;
}
// no need to bother with the length
if (!options.knownLength) {
this._lengthRetrievers.push(function(next) {
if (value.hasOwnProperty('fd')) {
// take read range into a account
// `end` = Infinity –> read file till the end
//
// TODO: Looks like there is bug in Node fs.createReadStream
// it doesn't respect `end` options without `start` options
// Fix it when node fixes it.
// https://github.com/joyent/node/issues/7819
if (value.end != undefined && value.end != Infinity && value.start != undefined) {
// when end specified
// no need to calculate range
// inclusive, starts with 0
next(null, value.end + 1 - (value.start ? value.start : 0));
// not that fast snoopy
} else {
// still need to fetch file size from fs
fs.stat(value.path, function(err, stat) {
var fileSize;
if (err) {
next(err);
return;
}
// update final size based on the range options
fileSize = stat.size - (value.start ? value.start : 0);
next(null, fileSize);
});
}
// or http response
} else if (value.hasOwnProperty('httpVersion')) {
next(null, +value.headers['content-length']);
// or request stream http://github.com/mikeal/request
} else if (value.hasOwnProperty('httpModule')) {
// wait till response come back
value.on('response', function(response) {
value.pause();
next(null, +response.headers['content-length']);
});
value.resume();
// something else
} else {
next('Unknown stream');
}
});
}
};
FormData.prototype._multiPartHeader = function(field, value, options) {
// custom header specified (as string)?
// it becomes responsible for boundary
// (e.g. to handle extra CRLFs on .NET servers)
if (typeof options.header == 'string') {
return options.header;
}
var contentDisposition = this._getContentDisposition(value, options);
var contentType = this._getContentType(value, options);
var contents = '';
var headers = {
// add custom disposition as third element or keep it two elements if not
'Content-Disposition': ['form-data', 'name="' + field + '"'].concat(contentDisposition || []),
// if no content type. allow it to be empty array
'Content-Type': [].concat(contentType || [])
};
// allow custom headers.
if (typeof options.header == 'object') {
populate(headers, options.header);
}
var header;
for (var prop in headers) {
header = headers[prop];
// skip nullish headers.
if (header == null) {
continue;
}
// convert all headers to arrays.
if (!Array.isArray(header)) {
header = [header];
}
// add non-empty headers.
if (header.length) {
contents += prop + ': ' + header.join('; ') + FormData.LINE_BREAK;
}
}
return '--' + this.getBoundary() + FormData.LINE_BREAK + contents + FormData.LINE_BREAK;
};
FormData.prototype._getContentDisposition = function(value, options) {
var contentDisposition;
// custom filename takes precedence
// fs- and request- streams have path property
// formidable and the browser add a name property.
var filename = options.filename || value.name || value.path;
// or try http response
if (!filename && value.readable && value.hasOwnProperty('httpVersion')) {
filename = value.client._httpMessage.path;
}
if (filename) {
contentDisposition = 'filename="' + path.basename(filename) + '"';
}
return contentDisposition;
};
FormData.prototype._getContentType = function(value, options) {
// use custom content-type above all
var contentType = options.contentType;
// or try `name` from formidable, browser
if (!contentType && value.name) {
contentType = mime.lookup(value.name);
}
// or try `path` from fs-, request- streams
if (!contentType && value.path) {
contentType = mime.lookup(value.path);
}
// or if it's http-reponse
if (!contentType && value.readable && value.hasOwnProperty('httpVersion')) {
contentType = value.headers['content-type'];
}
// or guess it from the filename
if (!contentType && options.filename) {
contentType = mime.lookup(options.filename);
}
// fallback to the default content type if `value` is not simple value
if (!contentType && typeof value == 'object') {
contentType = FormData.DEFAULT_CONTENT_TYPE;
}
return contentType;
};
FormData.prototype._multiPartFooter = function() {
return function(next) {
var footer = FormData.LINE_BREAK;
var lastPart = (this._streams.length === 0);
if (lastPart) {
footer += this._lastBoundary();
}
next(footer);
}.bind(this);
};
FormData.prototype._lastBoundary = function() {
return '--' + this.getBoundary() + '--' + FormData.LINE_BREAK;
};
FormData.prototype.getHeaders = function(userHeaders) {
var header;
var formHeaders = {
'content-type': 'multipart/form-data; boundary=' + this.getBoundary()
};
for (header in userHeaders) {
if (userHeaders.hasOwnProperty(header)) {
formHeaders[header.toLowerCase()] = userHeaders[header];
}
}
return formHeaders;
};
// TODO: Looks like unused function
FormData.prototype.getCustomHeaders = function(contentType) {
contentType = contentType ? contentType : 'multipart/form-data';
var formHeaders = {
'content-type': contentType + '; boundary=' + this.getBoundary(),
'content-length': this.getLengthSync()
};
return formHeaders;
};
FormData.prototype.getBoundary = function() {
if (!this._boundary) {
this._generateBoundary();
}
return this._boundary;
};
FormData.prototype._generateBoundary = function() {
// This generates a 50 character boundary similar to those used by Firefox.
// They are optimized for boyer-moore parsing.
var boundary = '--------------------------';
for (var i = 0; i < 24; i++) {
boundary += Math.floor(Math.random() * 10).toString(16);
}
this._boundary = boundary;
};
// Note: getLengthSync DOESN'T calculate streams length
// As workaround one can calculate file size manually
// and add it as knownLength option
FormData.prototype.getLengthSync = function() {
var knownLength = this._overheadLength + this._valueLength;
// Don't get confused, there are 3 "internal" streams for each keyval pair
// so it basically checks if there is any value added to the form
if (this._streams.length) {
knownLength += this._lastBoundary().length;
}
// https://github.com/form-data/form-data/issues/40
if (this._lengthRetrievers.length) {
// Some async length retrievers are present
// therefore synchronous length calculation is false.
// Please use getLength(callback) to get proper length
this._error(new Error('Cannot calculate proper length in synchronous way.'));
}
return knownLength;
};
FormData.prototype.getLength = function(cb) {
var knownLength = this._overheadLength + this._valueLength;
if (this._streams.length) {
knownLength += this._lastBoundary().length;
}
if (!this._lengthRetrievers.length) {
process.nextTick(cb.bind(this, null, knownLength));
return;
}
async.parallel(this._lengthRetrievers, function(err, values) {
if (err) {
cb(err);
return;
}
values.forEach(function(length) {
knownLength += length;
});
cb(null, knownLength);
});
};
FormData.prototype.submit = function(params, cb) {
var request
, options
, defaults = {method: 'post'}
;
// parse provided url if it's string
// or treat it as options object
if (typeof params == 'string') {
params = parseUrl(params);
options = populate({
port: params.port,
path: params.pathname,
host: params.hostname
}, defaults);
// use custom params
} else {
options = populate(params, defaults);
// if no port provided use default one
if (!options.port) {
options.port = options.protocol == 'https:' ? 443 : 80;
}
}
// put that good code in getHeaders to some use
options.headers = this.getHeaders(params.headers);
// https if specified, fallback to http in any other case
if (options.protocol == 'https:') {
request = https.request(options);
} else {
request = http.request(options);
}
// get content length and fire away
this.getLength(function(err, length) {
if (err) {
this._error(err);
return;
}
// add content length
request.setHeader('Content-Length', length);
this.pipe(request);
if (cb) {
request.on('error', cb);
request.on('response', cb.bind(this, null));
}
}.bind(this));
return request;
};
FormData.prototype._error = function(err) {
if (!this.error) {
this.error = err;
this.pause();
this.emit('error', err);
}
};
|