[6a3a178] | 1 | /*!
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| 2 | * mime-types
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| 3 | * Copyright(c) 2014 Jonathan Ong
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| 4 | * Copyright(c) 2015 Douglas Christopher Wilson
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| 5 | * MIT Licensed
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| 6 | */
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| 7 |
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| 8 | 'use strict'
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| 9 |
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| 10 | /**
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| 11 | * Module dependencies.
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| 12 | * @private
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| 13 | */
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| 14 |
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| 15 | var db = require('mime-db')
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| 16 | var extname = require('path').extname
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| 17 |
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| 18 | /**
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| 19 | * Module variables.
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| 20 | * @private
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| 21 | */
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| 22 |
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| 23 | var EXTRACT_TYPE_REGEXP = /^\s*([^;\s]*)(?:;|\s|$)/
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| 24 | var TEXT_TYPE_REGEXP = /^text\//i
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| 25 |
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| 26 | /**
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| 27 | * Module exports.
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| 28 | * @public
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| 29 | */
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| 30 |
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| 31 | exports.charset = charset
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| 32 | exports.charsets = { lookup: charset }
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| 33 | exports.contentType = contentType
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| 34 | exports.extension = extension
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| 35 | exports.extensions = Object.create(null)
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| 36 | exports.lookup = lookup
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| 37 | exports.types = Object.create(null)
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| 38 |
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| 39 | // Populate the extensions/types maps
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| 40 | populateMaps(exports.extensions, exports.types)
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| 41 |
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| 42 | /**
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| 43 | * Get the default charset for a MIME type.
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| 44 | *
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| 45 | * @param {string} type
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| 46 | * @return {boolean|string}
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| 47 | */
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| 48 |
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| 49 | function charset (type) {
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| 50 | if (!type || typeof type !== 'string') {
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| 51 | return false
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| 52 | }
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| 53 |
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| 54 | // TODO: use media-typer
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| 55 | var match = EXTRACT_TYPE_REGEXP.exec(type)
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| 56 | var mime = match && db[match[1].toLowerCase()]
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| 57 |
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| 58 | if (mime && mime.charset) {
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| 59 | return mime.charset
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| 60 | }
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| 61 |
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| 62 | // default text/* to utf-8
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| 63 | if (match && TEXT_TYPE_REGEXP.test(match[1])) {
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| 64 | return 'UTF-8'
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| 65 | }
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| 66 |
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| 67 | return false
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| 68 | }
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| 69 |
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| 70 | /**
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| 71 | * Create a full Content-Type header given a MIME type or extension.
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| 72 | *
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| 73 | * @param {string} str
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| 74 | * @return {boolean|string}
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| 75 | */
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| 76 |
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| 77 | function contentType (str) {
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| 78 | // TODO: should this even be in this module?
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| 79 | if (!str || typeof str !== 'string') {
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| 80 | return false
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| 81 | }
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| 82 |
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| 83 | var mime = str.indexOf('/') === -1
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| 84 | ? exports.lookup(str)
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| 85 | : str
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| 86 |
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| 87 | if (!mime) {
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| 88 | return false
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| 89 | }
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| 90 |
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| 91 | // TODO: use content-type or other module
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| 92 | if (mime.indexOf('charset') === -1) {
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| 93 | var charset = exports.charset(mime)
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| 94 | if (charset) mime += '; charset=' + charset.toLowerCase()
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| 95 | }
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| 96 |
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| 97 | return mime
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| 98 | }
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| 99 |
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| 100 | /**
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| 101 | * Get the default extension for a MIME type.
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| 102 | *
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| 103 | * @param {string} type
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| 104 | * @return {boolean|string}
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| 105 | */
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| 106 |
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| 107 | function extension (type) {
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| 108 | if (!type || typeof type !== 'string') {
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| 109 | return false
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| 110 | }
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| 111 |
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| 112 | // TODO: use media-typer
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| 113 | var match = EXTRACT_TYPE_REGEXP.exec(type)
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| 114 |
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| 115 | // get extensions
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| 116 | var exts = match && exports.extensions[match[1].toLowerCase()]
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| 117 |
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| 118 | if (!exts || !exts.length) {
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| 119 | return false
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| 120 | }
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| 121 |
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| 122 | return exts[0]
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| 123 | }
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| 124 |
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| 125 | /**
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| 126 | * Lookup the MIME type for a file path/extension.
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| 127 | *
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| 128 | * @param {string} path
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| 129 | * @return {boolean|string}
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| 130 | */
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| 131 |
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| 132 | function lookup (path) {
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| 133 | if (!path || typeof path !== 'string') {
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| 134 | return false
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| 135 | }
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| 136 |
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| 137 | // get the extension ("ext" or ".ext" or full path)
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| 138 | var extension = extname('x.' + path)
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| 139 | .toLowerCase()
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| 140 | .substr(1)
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| 141 |
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| 142 | if (!extension) {
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| 143 | return false
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| 144 | }
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| 145 |
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| 146 | return exports.types[extension] || false
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| 147 | }
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| 148 |
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| 149 | /**
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| 150 | * Populate the extensions and types maps.
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| 151 | * @private
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| 152 | */
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| 153 |
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| 154 | function populateMaps (extensions, types) {
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| 155 | // source preference (least -> most)
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| 156 | var preference = ['nginx', 'apache', undefined, 'iana']
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| 157 |
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| 158 | Object.keys(db).forEach(function forEachMimeType (type) {
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| 159 | var mime = db[type]
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| 160 | var exts = mime.extensions
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| 161 |
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| 162 | if (!exts || !exts.length) {
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| 163 | return
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| 164 | }
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| 165 |
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| 166 | // mime -> extensions
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| 167 | extensions[type] = exts
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| 168 |
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| 169 | // extension -> mime
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| 170 | for (var i = 0; i < exts.length; i++) {
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| 171 | var extension = exts[i]
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| 172 |
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| 173 | if (types[extension]) {
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| 174 | var from = preference.indexOf(db[types[extension]].source)
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| 175 | var to = preference.indexOf(mime.source)
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| 176 |
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| 177 | if (types[extension] !== 'application/octet-stream' &&
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| 178 | (from > to || (from === to && types[extension].substr(0, 12) === 'application/'))) {
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| 179 | // skip the remapping
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| 180 | continue
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| 181 | }
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| 182 | }
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| 183 |
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| 184 | // set the extension -> mime
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| 185 | types[extension] = type
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| 186 | }
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| 187 | })
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| 188 | }
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