source: trip-planner-front/node_modules/content-disposition/index.js@ 6a3a178

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1/*!
2 * content-disposition
3 * Copyright(c) 2014-2017 Douglas Christopher Wilson
4 * MIT Licensed
5 */
6
7'use strict'
8
9/**
10 * Module exports.
11 * @public
12 */
13
14module.exports = contentDisposition
15module.exports.parse = parse
16
17/**
18 * Module dependencies.
19 * @private
20 */
21
22var basename = require('path').basename
23var Buffer = require('safe-buffer').Buffer
24
25/**
26 * RegExp to match non attr-char, *after* encodeURIComponent (i.e. not including "%")
27 * @private
28 */
29
30var ENCODE_URL_ATTR_CHAR_REGEXP = /[\x00-\x20"'()*,/:;<=>?@[\\\]{}\x7f]/g // eslint-disable-line no-control-regex
31
32/**
33 * RegExp to match percent encoding escape.
34 * @private
35 */
36
37var HEX_ESCAPE_REGEXP = /%[0-9A-Fa-f]{2}/
38var HEX_ESCAPE_REPLACE_REGEXP = /%([0-9A-Fa-f]{2})/g
39
40/**
41 * RegExp to match non-latin1 characters.
42 * @private
43 */
44
45var NON_LATIN1_REGEXP = /[^\x20-\x7e\xa0-\xff]/g
46
47/**
48 * RegExp to match quoted-pair in RFC 2616
49 *
50 * quoted-pair = "\" CHAR
51 * CHAR = <any US-ASCII character (octets 0 - 127)>
52 * @private
53 */
54
55var QESC_REGEXP = /\\([\u0000-\u007f])/g // eslint-disable-line no-control-regex
56
57/**
58 * RegExp to match chars that must be quoted-pair in RFC 2616
59 * @private
60 */
61
62var QUOTE_REGEXP = /([\\"])/g
63
64/**
65 * RegExp for various RFC 2616 grammar
66 *
67 * parameter = token "=" ( token | quoted-string )
68 * token = 1*<any CHAR except CTLs or separators>
69 * separators = "(" | ")" | "<" | ">" | "@"
70 * | "," | ";" | ":" | "\" | <">
71 * | "/" | "[" | "]" | "?" | "="
72 * | "{" | "}" | SP | HT
73 * quoted-string = ( <"> *(qdtext | quoted-pair ) <"> )
74 * qdtext = <any TEXT except <">>
75 * quoted-pair = "\" CHAR
76 * CHAR = <any US-ASCII character (octets 0 - 127)>
77 * TEXT = <any OCTET except CTLs, but including LWS>
78 * LWS = [CRLF] 1*( SP | HT )
79 * CRLF = CR LF
80 * CR = <US-ASCII CR, carriage return (13)>
81 * LF = <US-ASCII LF, linefeed (10)>
82 * SP = <US-ASCII SP, space (32)>
83 * HT = <US-ASCII HT, horizontal-tab (9)>
84 * CTL = <any US-ASCII control character (octets 0 - 31) and DEL (127)>
85 * OCTET = <any 8-bit sequence of data>
86 * @private
87 */
88
89var PARAM_REGEXP = /;[\x09\x20]*([!#$%&'*+.0-9A-Z^_`a-z|~-]+)[\x09\x20]*=[\x09\x20]*("(?:[\x20!\x23-\x5b\x5d-\x7e\x80-\xff]|\\[\x20-\x7e])*"|[!#$%&'*+.0-9A-Z^_`a-z|~-]+)[\x09\x20]*/g // eslint-disable-line no-control-regex
90var TEXT_REGEXP = /^[\x20-\x7e\x80-\xff]+$/
91var TOKEN_REGEXP = /^[!#$%&'*+.0-9A-Z^_`a-z|~-]+$/
92
93/**
94 * RegExp for various RFC 5987 grammar
95 *
96 * ext-value = charset "'" [ language ] "'" value-chars
97 * charset = "UTF-8" / "ISO-8859-1" / mime-charset
98 * mime-charset = 1*mime-charsetc
99 * mime-charsetc = ALPHA / DIGIT
100 * / "!" / "#" / "$" / "%" / "&"
101 * / "+" / "-" / "^" / "_" / "`"
102 * / "{" / "}" / "~"
103 * language = ( 2*3ALPHA [ extlang ] )
104 * / 4ALPHA
105 * / 5*8ALPHA
106 * extlang = *3( "-" 3ALPHA )
107 * value-chars = *( pct-encoded / attr-char )
108 * pct-encoded = "%" HEXDIG HEXDIG
109 * attr-char = ALPHA / DIGIT
110 * / "!" / "#" / "$" / "&" / "+" / "-" / "."
111 * / "^" / "_" / "`" / "|" / "~"
112 * @private
113 */
114
115var EXT_VALUE_REGEXP = /^([A-Za-z0-9!#$%&+\-^_`{}~]+)'(?:[A-Za-z]{2,3}(?:-[A-Za-z]{3}){0,3}|[A-Za-z]{4,8}|)'((?:%[0-9A-Fa-f]{2}|[A-Za-z0-9!#$&+.^_`|~-])+)$/
116
117/**
118 * RegExp for various RFC 6266 grammar
119 *
120 * disposition-type = "inline" | "attachment" | disp-ext-type
121 * disp-ext-type = token
122 * disposition-parm = filename-parm | disp-ext-parm
123 * filename-parm = "filename" "=" value
124 * | "filename*" "=" ext-value
125 * disp-ext-parm = token "=" value
126 * | ext-token "=" ext-value
127 * ext-token = <the characters in token, followed by "*">
128 * @private
129 */
130
131var DISPOSITION_TYPE_REGEXP = /^([!#$%&'*+.0-9A-Z^_`a-z|~-]+)[\x09\x20]*(?:$|;)/ // eslint-disable-line no-control-regex
132
133/**
134 * Create an attachment Content-Disposition header.
135 *
136 * @param {string} [filename]
137 * @param {object} [options]
138 * @param {string} [options.type=attachment]
139 * @param {string|boolean} [options.fallback=true]
140 * @return {string}
141 * @public
142 */
143
144function contentDisposition (filename, options) {
145 var opts = options || {}
146
147 // get type
148 var type = opts.type || 'attachment'
149
150 // get parameters
151 var params = createparams(filename, opts.fallback)
152
153 // format into string
154 return format(new ContentDisposition(type, params))
155}
156
157/**
158 * Create parameters object from filename and fallback.
159 *
160 * @param {string} [filename]
161 * @param {string|boolean} [fallback=true]
162 * @return {object}
163 * @private
164 */
165
166function createparams (filename, fallback) {
167 if (filename === undefined) {
168 return
169 }
170
171 var params = {}
172
173 if (typeof filename !== 'string') {
174 throw new TypeError('filename must be a string')
175 }
176
177 // fallback defaults to true
178 if (fallback === undefined) {
179 fallback = true
180 }
181
182 if (typeof fallback !== 'string' && typeof fallback !== 'boolean') {
183 throw new TypeError('fallback must be a string or boolean')
184 }
185
186 if (typeof fallback === 'string' && NON_LATIN1_REGEXP.test(fallback)) {
187 throw new TypeError('fallback must be ISO-8859-1 string')
188 }
189
190 // restrict to file base name
191 var name = basename(filename)
192
193 // determine if name is suitable for quoted string
194 var isQuotedString = TEXT_REGEXP.test(name)
195
196 // generate fallback name
197 var fallbackName = typeof fallback !== 'string'
198 ? fallback && getlatin1(name)
199 : basename(fallback)
200 var hasFallback = typeof fallbackName === 'string' && fallbackName !== name
201
202 // set extended filename parameter
203 if (hasFallback || !isQuotedString || HEX_ESCAPE_REGEXP.test(name)) {
204 params['filename*'] = name
205 }
206
207 // set filename parameter
208 if (isQuotedString || hasFallback) {
209 params.filename = hasFallback
210 ? fallbackName
211 : name
212 }
213
214 return params
215}
216
217/**
218 * Format object to Content-Disposition header.
219 *
220 * @param {object} obj
221 * @param {string} obj.type
222 * @param {object} [obj.parameters]
223 * @return {string}
224 * @private
225 */
226
227function format (obj) {
228 var parameters = obj.parameters
229 var type = obj.type
230
231 if (!type || typeof type !== 'string' || !TOKEN_REGEXP.test(type)) {
232 throw new TypeError('invalid type')
233 }
234
235 // start with normalized type
236 var string = String(type).toLowerCase()
237
238 // append parameters
239 if (parameters && typeof parameters === 'object') {
240 var param
241 var params = Object.keys(parameters).sort()
242
243 for (var i = 0; i < params.length; i++) {
244 param = params[i]
245
246 var val = param.substr(-1) === '*'
247 ? ustring(parameters[param])
248 : qstring(parameters[param])
249
250 string += '; ' + param + '=' + val
251 }
252 }
253
254 return string
255}
256
257/**
258 * Decode a RFC 6987 field value (gracefully).
259 *
260 * @param {string} str
261 * @return {string}
262 * @private
263 */
264
265function decodefield (str) {
266 var match = EXT_VALUE_REGEXP.exec(str)
267
268 if (!match) {
269 throw new TypeError('invalid extended field value')
270 }
271
272 var charset = match[1].toLowerCase()
273 var encoded = match[2]
274 var value
275
276 // to binary string
277 var binary = encoded.replace(HEX_ESCAPE_REPLACE_REGEXP, pdecode)
278
279 switch (charset) {
280 case 'iso-8859-1':
281 value = getlatin1(binary)
282 break
283 case 'utf-8':
284 value = Buffer.from(binary, 'binary').toString('utf8')
285 break
286 default:
287 throw new TypeError('unsupported charset in extended field')
288 }
289
290 return value
291}
292
293/**
294 * Get ISO-8859-1 version of string.
295 *
296 * @param {string} val
297 * @return {string}
298 * @private
299 */
300
301function getlatin1 (val) {
302 // simple Unicode -> ISO-8859-1 transformation
303 return String(val).replace(NON_LATIN1_REGEXP, '?')
304}
305
306/**
307 * Parse Content-Disposition header string.
308 *
309 * @param {string} string
310 * @return {object}
311 * @public
312 */
313
314function parse (string) {
315 if (!string || typeof string !== 'string') {
316 throw new TypeError('argument string is required')
317 }
318
319 var match = DISPOSITION_TYPE_REGEXP.exec(string)
320
321 if (!match) {
322 throw new TypeError('invalid type format')
323 }
324
325 // normalize type
326 var index = match[0].length
327 var type = match[1].toLowerCase()
328
329 var key
330 var names = []
331 var params = {}
332 var value
333
334 // calculate index to start at
335 index = PARAM_REGEXP.lastIndex = match[0].substr(-1) === ';'
336 ? index - 1
337 : index
338
339 // match parameters
340 while ((match = PARAM_REGEXP.exec(string))) {
341 if (match.index !== index) {
342 throw new TypeError('invalid parameter format')
343 }
344
345 index += match[0].length
346 key = match[1].toLowerCase()
347 value = match[2]
348
349 if (names.indexOf(key) !== -1) {
350 throw new TypeError('invalid duplicate parameter')
351 }
352
353 names.push(key)
354
355 if (key.indexOf('*') + 1 === key.length) {
356 // decode extended value
357 key = key.slice(0, -1)
358 value = decodefield(value)
359
360 // overwrite existing value
361 params[key] = value
362 continue
363 }
364
365 if (typeof params[key] === 'string') {
366 continue
367 }
368
369 if (value[0] === '"') {
370 // remove quotes and escapes
371 value = value
372 .substr(1, value.length - 2)
373 .replace(QESC_REGEXP, '$1')
374 }
375
376 params[key] = value
377 }
378
379 if (index !== -1 && index !== string.length) {
380 throw new TypeError('invalid parameter format')
381 }
382
383 return new ContentDisposition(type, params)
384}
385
386/**
387 * Percent decode a single character.
388 *
389 * @param {string} str
390 * @param {string} hex
391 * @return {string}
392 * @private
393 */
394
395function pdecode (str, hex) {
396 return String.fromCharCode(parseInt(hex, 16))
397}
398
399/**
400 * Percent encode a single character.
401 *
402 * @param {string} char
403 * @return {string}
404 * @private
405 */
406
407function pencode (char) {
408 return '%' + String(char)
409 .charCodeAt(0)
410 .toString(16)
411 .toUpperCase()
412}
413
414/**
415 * Quote a string for HTTP.
416 *
417 * @param {string} val
418 * @return {string}
419 * @private
420 */
421
422function qstring (val) {
423 var str = String(val)
424
425 return '"' + str.replace(QUOTE_REGEXP, '\\$1') + '"'
426}
427
428/**
429 * Encode a Unicode string for HTTP (RFC 5987).
430 *
431 * @param {string} val
432 * @return {string}
433 * @private
434 */
435
436function ustring (val) {
437 var str = String(val)
438
439 // percent encode as UTF-8
440 var encoded = encodeURIComponent(str)
441 .replace(ENCODE_URL_ATTR_CHAR_REGEXP, pencode)
442
443 return 'UTF-8\'\'' + encoded
444}
445
446/**
447 * Class for parsed Content-Disposition header for v8 optimization
448 *
449 * @public
450 * @param {string} type
451 * @param {object} parameters
452 * @constructor
453 */
454
455function ContentDisposition (type, parameters) {
456 this.type = type
457 this.parameters = parameters
458}
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