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Diffstat (limited to 'comm/chat/protocols/matrix/lib/content-type/index.js')
| -rw-r--r-- | comm/chat/protocols/matrix/lib/content-type/index.js | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/comm/chat/protocols/matrix/lib/content-type/index.js b/comm/chat/protocols/matrix/lib/content-type/index.js new file mode 100644 index 0000000000..41840e7bc3 --- /dev/null +++ b/comm/chat/protocols/matrix/lib/content-type/index.js @@ -0,0 +1,225 @@ +/*! + * 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 +} |