68 lines
1.7 KiB
JavaScript
68 lines
1.7 KiB
JavaScript
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'use strict';
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/**
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* Parse the `Sec-WebSocket-Extensions` header into an object.
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*
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* @param {String} value field value of the header
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* @return {Object} The parsed object
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* @public
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*/
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const parse = (value) => {
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value = value || '';
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const extensions = {};
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value.split(',').forEach((v) => {
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const params = v.split(';');
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const token = params.shift().trim();
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const paramsList = extensions[token] = extensions[token] || [];
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const parsedParams = {};
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params.forEach((param) => {
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const parts = param.trim().split('=');
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const key = parts[0];
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var value = parts[1];
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if (value === undefined) {
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value = true;
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} else {
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// unquote value
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if (value[0] === '"') {
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value = value.slice(1);
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}
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if (value[value.length - 1] === '"') {
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value = value.slice(0, value.length - 1);
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}
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}
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(parsedParams[key] = parsedParams[key] || []).push(value);
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});
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paramsList.push(parsedParams);
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});
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return extensions;
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};
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/**
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* Serialize a parsed `Sec-WebSocket-Extensions` header to a string.
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*
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* @param {Object} value The object to format
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* @return {String} A string representing the given value
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* @public
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*/
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const format = (value) => {
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return Object.keys(value).map((token) => {
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var paramsList = value[token];
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if (!Array.isArray(paramsList)) paramsList = [paramsList];
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return paramsList.map((params) => {
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return [token].concat(Object.keys(params).map((k) => {
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var p = params[k];
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if (!Array.isArray(p)) p = [p];
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return p.map((v) => v === true ? k : `${k}=${v}`).join('; ');
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})).join('; ');
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}).join(', ');
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}).join(', ');
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};
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module.exports = { format, parse };
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