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