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var paramRegExp = /; *([!#$%&'\*\+\-\.0-9A-Z\^_`a-z\|~]+) *= *("(?:[ !\u0023-\u005b\u005d-\u007e\u0080-\u00ff]|\\[\u0020-\u007e])*"|[!#$%&'\*\+\-\.0-9A-Z\^_`a-z\|~]+) */g; |
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var textRegExp = /^[\u0020-\u007e\u0080-\u00ff]+$/ |
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var tokenRegExp = /^[!#$%&'\*\+\-\.0-9A-Z\^_`a-z\|~]+$/ |
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var qescRegExp = /\\([\u0000-\u007f])/g; |
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var quoteRegExp = /([\\"])/g; |
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var subtypeNameRegExp = /^[A-Za-z0-9][A-Za-z0-9!#$&^_.-]{0,126}$/ |
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var typeNameRegExp = /^[A-Za-z0-9][A-Za-z0-9!#$&^_-]{0,126}$/ |
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var typeRegExp = /^ *([A-Za-z0-9][A-Za-z0-9!#$&^_-]{0,126})\/([A-Za-z0-9][A-Za-z0-9!#$&^_.+-]{0,126}) *$/; |
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exports.format = format |
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exports.parse = parse |
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function format(obj) { |
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if (!obj || typeof obj !== 'object') { |
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throw new TypeError('argument obj is required') |
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} |
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var parameters = obj.parameters |
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var subtype = obj.subtype |
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var suffix = obj.suffix |
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var type = obj.type |
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if (!type || !typeNameRegExp.test(type)) { |
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throw new TypeError('invalid type') |
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} |
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if (!subtype || !subtypeNameRegExp.test(subtype)) { |
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throw new TypeError('invalid subtype') |
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} |
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var string = type + '/' + subtype |
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if (suffix) { |
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if (!typeNameRegExp.test(suffix)) { |
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throw new TypeError('invalid suffix') |
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} |
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string += '+' + suffix |
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} |
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if (parameters && typeof parameters === 'object') { |
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var param |
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var params = Object.keys(parameters).sort() |
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for (var i = 0; i < params.length; i++) { |
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param = params[i] |
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if (!tokenRegExp.test(param)) { |
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throw new TypeError('invalid parameter name') |
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} |
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string += '; ' + param + '=' + qstring(parameters[param]) |
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} |
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} |
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return string |
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} |
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function parse(string) { |
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if (!string) { |
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throw new TypeError('argument string is required') |
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} |
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if (typeof string === 'object') { |
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string = getcontenttype(string) |
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} |
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if (typeof string !== 'string') { |
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throw new TypeError('argument string is required to be a string') |
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} |
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var index = string.indexOf(';') |
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var type = index !== -1 |
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? string.substr(0, index) |
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: string |
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var key |
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var match |
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var obj = splitType(type) |
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var params = {} |
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var value |
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paramRegExp.lastIndex = index |
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while (match = paramRegExp.exec(string)) { |
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if (match.index !== index) { |
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throw new TypeError('invalid parameter format') |
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} |
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index += match[0].length |
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key = match[1].toLowerCase() |
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value = match[2] |
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if (value[0] === '"') { |
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value = value |
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.substr(1, value.length - 2) |
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.replace(qescRegExp, '$1') |
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} |
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params[key] = value |
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} |
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if (index !== -1 && index !== string.length) { |
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throw new TypeError('invalid parameter format') |
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} |
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obj.parameters = params |
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return obj |
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} |
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function getcontenttype(obj) { |
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if (typeof obj.getHeader === 'function') { |
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return obj.getHeader('content-type') |
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} |
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if (typeof obj.headers === 'object') { |
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return obj.headers && obj.headers['content-type'] |
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} |
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} |
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function qstring(val) { |
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var str = String(val) |
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if (tokenRegExp.test(str)) { |
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return str |
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} |
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if (str.length > 0 && !textRegExp.test(str)) { |
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throw new TypeError('invalid parameter value') |
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} |
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return '"' + str.replace(quoteRegExp, '\\$1') + '"' |
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} |
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function splitType(string) { |
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var match = typeRegExp.exec(string.toLowerCase()) |
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if (!match) { |
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throw new TypeError('invalid media type') |
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} |
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var type = match[1] |
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var subtype = match[2] |
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var suffix |
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var index = subtype.lastIndexOf('+') |
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if (index !== -1) { |
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suffix = subtype.substr(index + 1) |
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subtype = subtype.substr(0, index) |
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} |
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var obj = { |
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type: type, |
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subtype: subtype, |
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suffix: suffix |
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} |
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return obj |
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} |
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