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Diffstat (limited to 'node_modules/media-typer/index.js')
| -rw-r--r-- | node_modules/media-typer/index.js | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/node_modules/media-typer/index.js b/node_modules/media-typer/index.js new file mode 100644 index 0000000..07f7295 --- /dev/null +++ b/node_modules/media-typer/index.js @@ -0,0 +1,270 @@ +/*! + * 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 +} |