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#!/usr/bin/env node
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var util = require('util'),
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http = require('http'),
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fs = require('fs'),
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url = require('url'),
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events = require('events');
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var DEFAULT_PORT = 8000;
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function main(argv) {
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new HttpServer({
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'GET': createServlet(StaticServlet),
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'HEAD': createServlet(StaticServlet)
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}).start(Number(argv[2]) || DEFAULT_PORT);
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}
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function escapeHtml(value) {
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return value.toString().
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replace('<', '<').
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replace('>', '>').
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replace('"', '"');
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}
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function createServlet(Class) {
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var servlet = new Class();
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return servlet.handleRequest.bind(servlet);
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}
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/**
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* An Http server implementation that uses a map of methods to decide
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* action routing.
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*
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* @param {Object} Map of method => Handler function
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*/
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function HttpServer(handlers) {
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this.handlers = handlers;
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this.server = http.createServer(this.handleRequest_.bind(this));
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}
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HttpServer.prototype.start = function(port) {
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this.port = port;
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this.server.listen(port);
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util.puts('Http Server running at http://localhost:' + port + '/');
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};
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HttpServer.prototype.parseUrl_ = function(urlString) {
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var parsed = url.parse(urlString);
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parsed.pathname = url.resolve('/', parsed.pathname);
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return url.parse(url.format(parsed), true);
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};
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HttpServer.prototype.handleRequest_ = function(req, res) {
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var logEntry = req.method + ' ' + req.url;
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if (req.headers['user-agent']) {
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logEntry += ' ' + req.headers['user-agent'];
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}
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util.puts(logEntry);
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req.url = this.parseUrl_(req.url);
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var handler = this.handlers[req.method];
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if (!handler) {
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res.writeHead(501);
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res.end();
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} else {
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handler.call(this, req, res);
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}
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};
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/**
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* Handles static content.
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*/
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function StaticServlet() {}
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StaticServlet.MimeMap = {
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'txt': 'text/plain',
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'html': 'text/html',
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'css': 'text/css',
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'xml': 'application/xml',
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'json': 'application/json',
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'js': 'application/javascript',
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'jpg': 'image/jpeg',
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'jpeg': 'image/jpeg',
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'gif': 'image/gif',
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'png': 'image/png',
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'svg': 'image/svg+xml',
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'ico': 'image/vnd.microsoft.icon'
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};
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StaticServlet.prototype.handleRequest = function(req, res) {
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var self = this;
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var path = ('./' + req.url.pathname).replace('//','/').replace(/%(..)/g, function(match, hex){
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return String.fromCharCode(parseInt(hex, 16));
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});
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var parts = path.split('/');
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if (parts[parts.length-1].charAt(0) === '.')
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return self.sendForbidden_(req, res, path);
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fs.stat(path, function(err, stat) {
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if (err)
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return self.sendMissing_(req, res, path);
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if (stat.isDirectory())
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return self.sendDirectory_(req, res, path);
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return self.sendFile_(req, res, path);
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});
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}
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StaticServlet.prototype.sendError_ = function(req, res, error) {
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res.writeHead(500, {
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'Content-Type': 'text/html'
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});
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res.write('<!doctype html>\n');
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res.write('<title>Internal Server Error</title>\n');
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res.write('<h1>Internal Server Error</h1>');
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res.write('<pre>' + escapeHtml(util.inspect(error)) + '</pre>');
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util.puts('500 Internal Server Error');
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util.puts(util.inspect(error));
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};
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StaticServlet.prototype.sendMissing_ = function(req, res, path) {
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path = path.substring(1);
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res.writeHead(404, {
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'Content-Type': 'text/html'
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});
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res.write('<!doctype html>\n');
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res.write('<title>404 Not Found</title>\n');
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res.write('<h1>Not Found</h1>');
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res.write(
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'<p>The requested URL ' +
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escapeHtml(path) +
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' was not found on this server.</p>'
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);
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res.end();
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util.puts('404 Not Found: ' + path);
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};
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StaticServlet.prototype.sendForbidden_ = function(req, res, path) {
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path = path.substring(1);
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res.writeHead(403, {
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'Content-Type': 'text/html'
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});
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res.write('<!doctype html>\n');
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res.write('<title>403 Forbidden</title>\n');
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res.write('<h1>Forbidden</h1>');
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res.write(
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'<p>You do not have permission to access ' +
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escapeHtml(path) + ' on this server.</p>'
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);
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res.end();
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util.puts('403 Forbidden: ' + path);
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};
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StaticServlet.prototype.sendRedirect_ = function(req, res, redirectUrl) {
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res.writeHead(301, {
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'Content-Type': 'text/html',
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'Location': redirectUrl
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});
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res.write('<!doctype html>\n');
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res.write('<title>301 Moved Permanently</title>\n');
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res.write('<h1>Moved Permanently</h1>');
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res.write(
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'<p>The document has moved <a href="' +
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redirectUrl +
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'">here</a>.</p>'
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);
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res.end();
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util.puts('301 Moved Permanently: ' + redirectUrl);
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};
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StaticServlet.prototype.sendFile_ = function(req, res, path) {
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var self = this;
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var file = fs.createReadStream(path);
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res.writeHead(200, {
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'Content-Type': StaticServlet.
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MimeMap[path.split('.').pop()] || 'text/plain'
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});
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if (req.method === 'HEAD') {
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res.end();
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} else {
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file.on('data', res.write.bind(res));
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file.on('close', function() {
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res.end();
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});
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file.on('error', function(error) {
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self.sendError_(req, res, error);
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});
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}
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};
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StaticServlet.prototype.sendDirectory_ = function(req, res, path) {
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var self = this;
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if (path.match(/[^\/]$/)) {
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req.url.pathname += '/';
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var redirectUrl = url.format(url.parse(url.format(req.url)));
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return self.sendRedirect_(req, res, redirectUrl);
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}
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fs.readdir(path, function(err, files) {
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if (err)
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return self.sendError_(req, res, error);
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if (!files.length)
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return self.writeDirectoryIndex_(req, res, path, []);
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var remaining = files.length;
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files.forEach(function(fileName, index) {
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fs.stat(path + '/' + fileName, function(err, stat) {
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if (err)
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return self.sendError_(req, res, err);
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if (stat.isDirectory()) {
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files[index] = fileName + '/';
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}
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if (!(--remaining))
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return self.writeDirectoryIndex_(req, res, path, files);
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});
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});
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});
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};
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StaticServlet.prototype.writeDirectoryIndex_ = function(req, res, path, files) {
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path = path.substring(1);
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res.writeHead(200, {
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'Content-Type': 'text/html'
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});
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if (req.method === 'HEAD') {
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res.end();
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return;
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}
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res.write('<!doctype html>\n');
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res.write('<title>' + escapeHtml(path) + '</title>\n');
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res.write('<style>\n');
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res.write(' ol { list-style-type: none; font-size: 1.2em; }\n');
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res.write('</style>\n');
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res.write('<h1>Directory: ' + escapeHtml(path) + '</h1>');
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res.write('<ol>');
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files.forEach(function(fileName) {
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if (fileName.charAt(0) !== '.') {
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res.write('<li><a href="' +
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escapeHtml(fileName) + '">' +
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escapeHtml(fileName) + '</a></li>');
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}
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});
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res.write('</ol>');
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res.end();
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};
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// Must be last,
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main(process.argv);
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