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'use strict';
var utils = require('./../utils');
// Headers whose duplicates are ignored by node
// c.f. https://nodejs.org/api/http.html#http_message_headers
var ignoreDuplicateOf = [
'age', 'authorization', 'content-length', 'content-type', 'etag',
'expires', 'from', 'host', 'if-modified-since', 'if-unmodified-since',
'last-modified', 'location', 'max-forwards', 'proxy-authorization',
'referer', 'retry-after', 'user-agent'
];
/**
* Parse headers into an object
*
* ```
* Date: Wed, 27 Aug 2014 08:58:49 GMT
* Content-Type: application/json
* Connection: keep-alive
* Transfer-Encoding: chunked
* ```
*
* @param {String} headers Headers needing to be parsed
* @returns {Object} Headers parsed into an object
*/
module.exports = function parseHeaders(headers) {
var parsed = {};
var key;
var val;
var i;
if (!headers) { return parsed; }
utils.forEach(headers.split('\n'), function parser(line) {
i = line.indexOf(':');
key = utils.trim(line.substr(0, i)).toLowerCase();
val = utils.trim(line.substr(i + 1));
if (key) {
if (parsed[key] && ignoreDuplicateOf.indexOf(key) >= 0) {
return;
}
if (key === 'set-cookie') {
parsed[key] = (parsed[key] ? parsed[key] : []).concat([val]);
} else {
parsed[key] = parsed[key] ? parsed[key] + ', ' + val : val;
}
}
});
return parsed;
};
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