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