File size: 5,002 Bytes
f9f0fec |
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 |
/*!
* content-type
* Copyright(c) 2015 Douglas Christopher Wilson
* MIT Licensed
*/
'use strict'
/**
* RegExp to match *( ";" parameter ) in RFC 7231 sec 3.1.1.1
*
* parameter = token "=" ( token / quoted-string )
* token = 1*tchar
* tchar = "!" / "#" / "$" / "%" / "&" / "'" / "*"
* / "+" / "-" / "." / "^" / "_" / "`" / "|" / "~"
* / DIGIT / ALPHA
* ; any VCHAR, except delimiters
* quoted-string = DQUOTE *( qdtext / quoted-pair ) DQUOTE
* qdtext = HTAB / SP / %x21 / %x23-5B / %x5D-7E / obs-text
* obs-text = %x80-FF
* quoted-pair = "\" ( HTAB / SP / VCHAR / obs-text )
*/
var PARAM_REGEXP = /; *([!#$%&'*+.^_`|~0-9A-Za-z-]+) *= *("(?:[\u000b\u0020\u0021\u0023-\u005b\u005d-\u007e\u0080-\u00ff]|\\[\u000b\u0020-\u00ff])*"|[!#$%&'*+.^_`|~0-9A-Za-z-]+) */g // eslint-disable-line no-control-regex
var TEXT_REGEXP = /^[\u000b\u0020-\u007e\u0080-\u00ff]+$/ // eslint-disable-line no-control-regex
var TOKEN_REGEXP = /^[!#$%&'*+.^_`|~0-9A-Za-z-]+$/
/**
* RegExp to match quoted-pair in RFC 7230 sec 3.2.6
*
* quoted-pair = "\" ( HTAB / SP / VCHAR / obs-text )
* obs-text = %x80-FF
*/
var QESC_REGEXP = /\\([\u000b\u0020-\u00ff])/g // eslint-disable-line no-control-regex
/**
* RegExp to match chars that must be quoted-pair in RFC 7230 sec 3.2.6
*/
var QUOTE_REGEXP = /([\\"])/g
/**
* RegExp to match type in RFC 7231 sec 3.1.1.1
*
* media-type = type "/" subtype
* type = token
* subtype = token
*/
var TYPE_REGEXP = /^[!#$%&'*+.^_`|~0-9A-Za-z-]+\/[!#$%&'*+.^_`|~0-9A-Za-z-]+$/
/**
* Module exports.
* @public
*/
exports.format = format
exports.parse = parse
/**
* Format object to media type.
*
* @param {object} obj
* @return {string}
* @public
*/
function format (obj) {
if (!obj || typeof obj !== 'object') {
throw new TypeError('argument obj is required')
}
var parameters = obj.parameters
var type = obj.type
if (!type || !TYPE_REGEXP.test(type)) {
throw new TypeError('invalid type')
}
var string = type
// 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 (!TOKEN_REGEXP.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}
* @public
*/
function parse (string) {
if (!string) {
throw new TypeError('argument string is required')
}
// support req/res-like objects as argument
var header = typeof string === 'object'
? getcontenttype(string)
: string
if (typeof header !== 'string') {
throw new TypeError('argument string is required to be a string')
}
var index = header.indexOf(';')
var type = index !== -1
? header.slice(0, index).trim()
: header.trim()
if (!TYPE_REGEXP.test(type)) {
throw new TypeError('invalid media type')
}
var obj = new ContentType(type.toLowerCase())
// parse parameters
if (index !== -1) {
var key
var match
var value
PARAM_REGEXP.lastIndex = index
while ((match = PARAM_REGEXP.exec(header))) {
if (match.index !== index) {
throw new TypeError('invalid parameter format')
}
index += match[0].length
key = match[1].toLowerCase()
value = match[2]
if (value.charCodeAt(0) === 0x22 /* " */) {
// remove quotes
value = value.slice(1, -1)
// remove escapes
if (value.indexOf('\\') !== -1) {
value = value.replace(QESC_REGEXP, '$1')
}
}
obj.parameters[key] = value
}
if (index !== header.length) {
throw new TypeError('invalid parameter format')
}
}
return obj
}
/**
* Get content-type from req/res objects.
*
* @param {object}
* @return {Object}
* @private
*/
function getcontenttype (obj) {
var header
if (typeof obj.getHeader === 'function') {
// res-like
header = obj.getHeader('content-type')
} else if (typeof obj.headers === 'object') {
// req-like
header = obj.headers && obj.headers['content-type']
}
if (typeof header !== 'string') {
throw new TypeError('content-type header is missing from object')
}
return header
}
/**
* Quote a string if necessary.
*
* @param {string} val
* @return {string}
* @private
*/
function qstring (val) {
var str = String(val)
// no need to quote tokens
if (TOKEN_REGEXP.test(str)) {
return str
}
if (str.length > 0 && !TEXT_REGEXP.test(str)) {
throw new TypeError('invalid parameter value')
}
return '"' + str.replace(QUOTE_REGEXP, '\\$1') + '"'
}
/**
* Class to represent a content type.
* @private
*/
function ContentType (type) {
this.parameters = Object.create(null)
this.type = type
}
|