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