This app provides monitoring and information features for the common freifunk user and the technical stuff of a freifunk community.
Code base is taken from a TUM Practical Course project and added here to see if Freifunk Altdorf can use it.
https://www.freifunk-altdorf.de
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93 lines
2.0 KiB
93 lines
2.0 KiB
/*! |
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* on-headers |
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* Copyright(c) 2014 Douglas Christopher Wilson |
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* MIT Licensed |
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*/ |
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'use strict' |
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/** |
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* Reference to Array slice. |
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*/ |
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var slice = Array.prototype.slice |
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/** |
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* Execute a listener when a response is about to write headers. |
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* |
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* @param {Object} res |
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* @return {Function} listener |
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* @api public |
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*/ |
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module.exports = function onHeaders(res, listener) { |
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if (!res) { |
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throw new TypeError('argument res is required') |
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} |
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if (typeof listener !== 'function') { |
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throw new TypeError('argument listener must be a function') |
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} |
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res.writeHead = createWriteHead(res.writeHead, listener) |
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} |
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function createWriteHead(prevWriteHead, listener) { |
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var fired = false; |
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// return function with core name and argument list |
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return function writeHead(statusCode) { |
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// set headers from arguments |
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var args = setWriteHeadHeaders.apply(this, arguments); |
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// fire listener |
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if (!fired) { |
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fired = true |
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listener.call(this) |
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// pass-along an updated status code |
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if (typeof args[0] === 'number' && this.statusCode !== args[0]) { |
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args[0] = this.statusCode |
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args.length = 1 |
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} |
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} |
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prevWriteHead.apply(this, args); |
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} |
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} |
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function setWriteHeadHeaders(statusCode) { |
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var length = arguments.length |
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var headerIndex = length > 1 && typeof arguments[1] === 'string' |
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? 2 |
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: 1 |
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var headers = length >= headerIndex + 1 |
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? arguments[headerIndex] |
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: undefined |
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this.statusCode = statusCode |
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// the following block is from node.js core |
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if (Array.isArray(headers)) { |
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// handle array case |
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for (var i = 0, len = headers.length; i < len; ++i) { |
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this.setHeader(headers[i][0], headers[i][1]) |
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} |
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} else if (headers) { |
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// handle object case |
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var keys = Object.keys(headers) |
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for (var i = 0; i < keys.length; i++) { |
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var k = keys[i] |
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if (k) this.setHeader(k, headers[k]) |
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} |
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} |
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// copy leading arguments |
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var args = new Array(Math.min(length, headerIndex)) |
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for (var i = 0; i < args.length; i++) { |
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args[i] = arguments[i] |
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} |
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return args |
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}
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