File: index.js

package info (click to toggle)
node-media-typer 0.3.0-1
  • links: PTS, VCS
  • area: main
  • in suites: jessie, jessie-kfreebsd, stretch
  • size: 100 kB
  • ctags: 2
  • sloc: makefile: 6
file content (270 lines) | stat: -rw-r--r-- 6,375 bytes parent folder | download | duplicates (6)
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
/*!
 * media-typer
 * Copyright(c) 2014 Douglas Christopher Wilson
 * MIT Licensed
 */

/**
 * RegExp to match *( ";" parameter ) in RFC 2616 sec 3.7
 *
 * parameter     = token "=" ( token | quoted-string )
 * token         = 1*<any CHAR except CTLs or separators>
 * separators    = "(" | ")" | "<" | ">" | "@"
 *               | "," | ";" | ":" | "\" | <">
 *               | "/" | "[" | "]" | "?" | "="
 *               | "{" | "}" | SP | HT
 * quoted-string = ( <"> *(qdtext | quoted-pair ) <"> )
 * qdtext        = <any TEXT except <">>
 * quoted-pair   = "\" CHAR
 * CHAR          = <any US-ASCII character (octets 0 - 127)>
 * TEXT          = <any OCTET except CTLs, but including LWS>
 * LWS           = [CRLF] 1*( SP | HT )
 * CRLF          = CR LF
 * CR            = <US-ASCII CR, carriage return (13)>
 * LF            = <US-ASCII LF, linefeed (10)>
 * SP            = <US-ASCII SP, space (32)>
 * SHT           = <US-ASCII HT, horizontal-tab (9)>
 * CTL           = <any US-ASCII control character (octets 0 - 31) and DEL (127)>
 * OCTET         = <any 8-bit sequence of data>
 */
var paramRegExp = /; *([!#$%&'\*\+\-\.0-9A-Z\^_`a-z\|~]+) *= *("(?:[ !\u0023-\u005b\u005d-\u007e\u0080-\u00ff]|\\[\u0020-\u007e])*"|[!#$%&'\*\+\-\.0-9A-Z\^_`a-z\|~]+) */g;
var textRegExp = /^[\u0020-\u007e\u0080-\u00ff]+$/
var tokenRegExp = /^[!#$%&'\*\+\-\.0-9A-Z\^_`a-z\|~]+$/

/**
 * RegExp to match quoted-pair in RFC 2616
 *
 * quoted-pair = "\" CHAR
 * CHAR        = <any US-ASCII character (octets 0 - 127)>
 */
var qescRegExp = /\\([\u0000-\u007f])/g;

/**
 * RegExp to match chars that must be quoted-pair in RFC 2616
 */
var quoteRegExp = /([\\"])/g;

/**
 * RegExp to match type in RFC 6838
 *
 * type-name = restricted-name
 * subtype-name = restricted-name
 * restricted-name = restricted-name-first *126restricted-name-chars
 * restricted-name-first  = ALPHA / DIGIT
 * restricted-name-chars  = ALPHA / DIGIT / "!" / "#" /
 *                          "$" / "&" / "-" / "^" / "_"
 * restricted-name-chars =/ "." ; Characters before first dot always
 *                              ; specify a facet name
 * restricted-name-chars =/ "+" ; Characters after last plus always
 *                              ; specify a structured syntax suffix
 * ALPHA =  %x41-5A / %x61-7A   ; A-Z / a-z
 * DIGIT =  %x30-39             ; 0-9
 */
var subtypeNameRegExp = /^[A-Za-z0-9][A-Za-z0-9!#$&^_.-]{0,126}$/
var typeNameRegExp = /^[A-Za-z0-9][A-Za-z0-9!#$&^_-]{0,126}$/
var typeRegExp = /^ *([A-Za-z0-9][A-Za-z0-9!#$&^_-]{0,126})\/([A-Za-z0-9][A-Za-z0-9!#$&^_.+-]{0,126}) *$/;

/**
 * Module exports.
 */

exports.format = format
exports.parse = parse

/**
 * Format object to media type.
 *
 * @param {object} obj
 * @return {string}
 * @api public
 */

function format(obj) {
  if (!obj || typeof obj !== 'object') {
    throw new TypeError('argument obj is required')
  }

  var parameters = obj.parameters
  var subtype = obj.subtype
  var suffix = obj.suffix
  var type = obj.type

  if (!type || !typeNameRegExp.test(type)) {
    throw new TypeError('invalid type')
  }

  if (!subtype || !subtypeNameRegExp.test(subtype)) {
    throw new TypeError('invalid subtype')
  }

  // format as type/subtype
  var string = type + '/' + subtype

  // append +suffix
  if (suffix) {
    if (!typeNameRegExp.test(suffix)) {
      throw new TypeError('invalid suffix')
    }

    string += '+' + suffix
  }

  // append parameters
  if (parameters && typeof parameters === 'object') {
    var param
    var params = Object.keys(parameters).sort()

    for (var i = 0; i < params.length; i++) {
      param = params[i]

      if (!tokenRegExp.test(param)) {
        throw new TypeError('invalid parameter name')
      }

      string += '; ' + param + '=' + qstring(parameters[param])
    }
  }

  return string
}

/**
 * Parse media type to object.
 *
 * @param {string|object} string
 * @return {Object}
 * @api public
 */

function parse(string) {
  if (!string) {
    throw new TypeError('argument string is required')
  }

  // support req/res-like objects as argument
  if (typeof string === 'object') {
    string = getcontenttype(string)
  }

  if (typeof string !== 'string') {
    throw new TypeError('argument string is required to be a string')
  }

  var index = string.indexOf(';')
  var type = index !== -1
    ? string.substr(0, index)
    : string

  var key
  var match
  var obj = splitType(type)
  var params = {}
  var value

  paramRegExp.lastIndex = index

  while (match = paramRegExp.exec(string)) {
    if (match.index !== index) {
      throw new TypeError('invalid parameter format')
    }

    index += match[0].length
    key = match[1].toLowerCase()
    value = match[2]

    if (value[0] === '"') {
      // remove quotes and escapes
      value = value
        .substr(1, value.length - 2)
        .replace(qescRegExp, '$1')
    }

    params[key] = value
  }

  if (index !== -1 && index !== string.length) {
    throw new TypeError('invalid parameter format')
  }

  obj.parameters = params

  return obj
}

/**
 * Get content-type from req/res objects.
 *
 * @param {object}
 * @return {Object}
 * @api private
 */

function getcontenttype(obj) {
  if (typeof obj.getHeader === 'function') {
    // res-like
    return obj.getHeader('content-type')
  }

  if (typeof obj.headers === 'object') {
    // req-like
    return obj.headers && obj.headers['content-type']
  }
}

/**
 * Quote a string if necessary.
 *
 * @param {string} val
 * @return {string}
 * @api private
 */

function qstring(val) {
  var str = String(val)

  // no need to quote tokens
  if (tokenRegExp.test(str)) {
    return str
  }

  if (str.length > 0 && !textRegExp.test(str)) {
    throw new TypeError('invalid parameter value')
  }

  return '"' + str.replace(quoteRegExp, '\\$1') + '"'
}

/**
 * Simply "type/subtype+siffx" into parts.
 *
 * @param {string} string
 * @return {Object}
 * @api private
 */

function splitType(string) {
  var match = typeRegExp.exec(string.toLowerCase())

  if (!match) {
    throw new TypeError('invalid media type')
  }

  var type = match[1]
  var subtype = match[2]
  var suffix

  // suffix after last +
  var index = subtype.lastIndexOf('+')
  if (index !== -1) {
    suffix = subtype.substr(index + 1)
    subtype = subtype.substr(0, index)
  }

  var obj = {
    type: type,
    subtype: subtype,
    suffix: suffix
  }

  return obj
}