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file_server.js
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file_server.js
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/**
* A simple node.js static file server with no external dependencies
*
* Features:
*
* Directory listing
* Navigation outside of root not permitted
* Real filesystem root dir is not exposed to clients
* Command line options for port, root (see "options" below)
* Files are streamed to client (rather than read completely into memory first)
*/
// Supported command line options
var options = new Options({
help: { switches: ['--help', '-h'], description: "Show help" },
port: { switches: ['--port', '-p'], description: "Port to listen on", default: 8888 },
root: { switches: ['--root', '-r'], description: "Root dir to serve, defaults to CWD", default: process.cwd() }
});
// todo if-modified-since -> 304 support, plus expiry/cache headers
// todo logfile for service usage
var http = require("http"),
url = require("url"),
path = require("path"),
fs = require("fs"),
util = require("util");
// Validate command line args
var args = options.parse(process.argv);
if (args.help) {
console.error("Usage: node file_server.js [options]\nOptions:\n" + options.describe());
process.exit(0);
}
var port = args.port;
if (isNaN(port)) {
console.error("Bad port: %s", port);
process.exit(0);
}
var root = args.root;
if (!path.existsSync(root) || !fs.statSync(root).isDirectory()) {
console.error("Bad root directory: %s", root);
process.exit(0);
}
var serverjsFilename = process.argv[1];
var cssUri = path.basename(serverjsFilename) + ".css";
// Start server
http.createServer(requestHandler).listen(parseInt(port, 10));
console.log("Listening on port %d, root %s", port, root);
// Private
function requestHandler(request, response) {
var uri = url.parse(request.url).pathname
, filename = path.join(root, uri);
if (uri == "/" + cssUri) {
cssHandler(response);
return;
}
path.exists(filename, function(exists) {
if (!exists) {
response.writeHead(404, {"Content-Type": "text/plain"});
response.write("404 Not Found\n");
response.end();
return;
}
if (fs.statSync(filename).isDirectory()) {
directoryHandler(response, uri, filename);
return;
};
// Stream file to client
var s = fs.createReadStream(filename);
var startedStreaming = false;
s.on("open", function(fd) {
s.pipe(response);
startedStreaming = true;
});
s.on("error", function(err) {
console.error("Error reading stream for file %s: %s", filename, err);
if (!startedStreaming)
{
internalErrorHandler(response, err);
}
});
});
}
function directoryHandler(response, uri, filename) {
function dirListingRow(filename, stat) {
return util.format(
'<tr><td><a href="%s">%s</a></td><td>%s</td><td>%s</td><td>%s</td></tr>',
path.join(uri, filename),
filename + (stat && stat.isDirectory() ? "/" : ""),
(stat && !stat.isDirectory() ? stat.size : "<Directory>"),
stat ? util.inspect(new Date(stat.mtime)) : '',
stat ? util.inspect(new Date(stat.ctime)) : ''
);
}
function writeFiles(response, files, stats) {
for (var j = 0; j < files.length; j++) {
response.write(dirListingRow(files[j], stats[files[j]]));
}
response.write('</table>');
response.end();
}
fs.readdir(filename, function(err, files) {
if (err) {
internalErrorHandler(response, err);
return;
}
response.writeHead(200, {"Content-Type": "text/html"});
response.write(util.format("<h1>%s</h1>", uri));
response.write(util.format('<link rel="stylesheet" href="/%s">', cssUri));
response.write('<table width="100%" cellpadding="0" cellspacing="0" border="0">');
response.write('<tr><th>Name</th><th></th><th>Created</th><th>Modified</th></tr>');
if (uri != '/') {
response.write(dirListingRow('..'));
}
var count = 0;
var stats = {};
for (var i = 0; i < files.length; i++) {
var file = files[i];
fs.stat(path.join(filename, file), function(file, err, stat) {
if (err) {
internalErrorHandler(response, err);
return;
}
stats[file] = stat;
if (++count == files.length) {
writeFiles(response, files, stats);
}
}.bind(null, file));
}
});
}
function cssHandler(response) {
fs.readFile(serverjsFilename, "utf8", function(err, file) {
if (err) {
console.error("Error reading file for CSS: %s", err);
internalErrorHandler(response, err);
return;
}
var offset = file.indexOf('/' + '* CSS') + 6; // prevent finding *this* occurance
file = file.substr(offset, file.indexOf('*/', offset) - offset);
response.writeHead(200, {"Content-Type": "text/css"});
response.write(file);
response.end();
});
}
function internalErrorHandler(response, err) {
response.writeHead(500, {"Content-Type": "text/plain"});
response.write(err + "\n");
response.end();
}
/**
* Helper to parse command line args
*/
function Options(config) {
this._config = config;
this.parse = function(args) {
var result = {};
for (var name in this._config) {
var option = this._config[name];
for (var i = 0; i < option.switches.length; i++) {
var sw = option.switches[i];
var index = args.indexOf(sw);
if (index != -1) {
if (option.default) { // ie, value should follow
result[name] = args[index + 1].charAt(0) != '-' ? args[index + 1] : null;
} else {
result[name] = true;
}
} else if (result[name] === undefined && option.default) {
result[name] = option.default;
}
}
}
return result;
};
this.describe = function() {
var s = "";
for (var name in this._config) {
var option = this._config[name];
var sw = option.switches.join(", ");
var pad = Math.max(12 - sw.length, 0);
while (pad--) s += ' ';
s += sw;
pad = 10;
while (pad--) s += ' ';
s += option.description;
if (option.default) {
pad = Math.max(40 - option.description.length, 0);
while (pad--) s += ' ';
s += '(Optional, defaults to ' + option.default + ')';
}
s += "\n";
}
return s;
};
}
/* CSS
* {
font-family: Monaco, ProFont, "Bitstream Vera Sans Mono", "American Typewriter", "Andale Mono", monospace;
}
h1 {
font-size: 1.4em;
}
p, td {
font-size: 0.9em;
}
a:link, a:visited {
color: blue;
text-decoration: none;
}
a:hover, a:active {
color: blue;
text-decoration: underline;
}
.directory {
font-weight: bold;
}
tr {
text-align: left;
}
th {
font-size: 0.9em;
border-bottom: 1px solid #E0E0E0;
}
td {
padding-right: 8;
}
*/