node-http-server – Rev 24
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#!/usr/bin/env node
/*************************************************************************/
/* Copyright (C) 2017 Wizardry and Steamworks - License: GNU GPLv3 */
/*************************************************************************/
const url = require('url');
const path = require('path');
const fs = require('fs');
const mime = require('mime');
const auth = require("http-auth");
// Checks whether userPath is a child of rootPath.
function isRooted(userPath, rootPath, separator, callback) {
fs.realpath(userPath, (error, resolved) => {
if (error)
return false;
resolved = resolved.split(separator).filter(Boolean);
rootPath = rootPath.split(separator).filter(Boolean);
callback(resolved.length >= rootPath.length &&
rootPath.every((e, i) => e === resolved[i]));
});
}
// Serves files.
function files(config, request, response, requestPath, callback) {
// Check if the file is accessible.
fs.access(requestPath, fs.constants.R_OK, (error) => {
if (error) {
response.statusCode = 403;
response.end();
return;
}
response.setHeader(
'Content-Type',
mime.lookup(requestPath)
);
var readStream = fs.createReadStream(requestPath)
.on('open', () => {
response.statusCode = 200;
readStream.pipe(response);
})
.on('error', () => {
response.statusCode = 500;
response.end();
});
});
}
// Serves a directory listing or the document index in case it exists.
function index(config, request, response, requestPath, requestURL, callback) {
const root = path.resolve(requestPath, config.site.index);
fs.stat(root, (error, stats) => {
if (error) {
if (config.site.indexing
.some((directory) =>
directory.toUpperCase() === requestURL.toUpperCase())) {
fs.readdir(requestPath, (error, paths) => {
if (error) {
process.nextTick(() => {
callback('Could not list directory: ' +
requestPath,
module.exports.error.level.ERROR
);
});
response.statusCode = 500;
response.end();
return;
}
process.nextTick(() => {
callback('Directory listing requested for: ' +
requestPath,
module.exports.error.level.INFO
);
});
response.statusCode = 200;
response.write(JSON.stringify(paths));
response.end();
});
return;
}
// Could not access directory index file and directory listing not allowed.
response.statusCode = 404;
response.end();
return;
}
// Serve the document index.
fs.access(root, fs.constants.R_OK, (error) => {
if (error) {
process.nextTick(() => {
callback('The server was unable to access the filesystem path: ' +
requestPath,
module.exports.error.level.WARN
);
});
response.statusCode = 403;
response.end();
return;
}
// Set MIME content type.
response.setHeader(
'Content-Type',
mime.lookup(root)
);
var readStream = fs.createReadStream(root)
.on('open', () => {
response.statusCode = 200;
readStream.pipe(response);
})
.on('error', () => {
response.statusCode = 500;
response.end();
});
});
});
}
// Determines whether the requested filesystem request path is a directory or a file.
function serve(config, request, response, requestPath, requestURL, callback) {
fs.stat(requestPath, (error, stats) => {
// Document does not exist.
if (error) {
response.statusCode = 404;
response.end();
return;
}
if (stats.isDirectory()) {
// Directory is requested so provide directory indexes.
index(config, request, response, requestPath, requestURL, callback);
return;
}
if (stats.isFile()) {
const file = path.parse(requestPath).base;
// If the file matches the reject list or is not in the accept list,
// then there is no file to serve.
if (config.site.reject.some((expression) => expression.test(file)) ||
!config.site.accept.some((expression) => expression.test(file))) {
response.statusCode = 404;
response.end();
return;
}
// A file was requested so provide the file.
files(config, request, response, requestPath, callback);
}
});
}
module.exports = {
error: {
level: {
INFO: 1,
WARN: 2,
ERROR: 3
}
},
process: (config, request, response, root, callback) => {
process.nextTick(() => {
const requestAddress = request.socket.address();
const requestURL = url.parse(
request.url, true
);
const trimmedPath = requestURL
.pathname
.split('/')
.filter(Boolean)
.join('/');
const requestPath = trimmedPath === '/' ?
path.join(root, trimmedPath) :
path.resolve(root, trimmedPath);
// Check for path traversals early on and bail if the requested path does not
// lie within the specified document root.
isRooted(requestPath, root, path.sep, (rooted) => {
if (!rooted) {
process.nextTick(() => {
callback('Attempted path traversal: ' +
requestAddress.address + ':' +
requestAddress.port +
' requesting: ' +
requestURL.pathname,
module.exports.error.level.WARN
);
});
response.statusCode = 404;
response.end();
return;
}
// If authentication is required for this path then perform authentication.
if (config.auth.locations.some(
(authPath) => authPath.toUpperCase() === requestURL.pathname.toUpperCase())) {
// Create digest authentication.
const authentication = auth.digest({
realm: config.auth.realm,
file: path.resolve(
path.dirname(require.main.filename),
config.auth.digest
)
});
// Requested location requires authentication.
authentication.check(request, response, (request, response) => {
process.nextTick(() => {
callback('Authenticated client: ' +
requestAddress.address + ':' +
requestAddress.port +
' accessing: ' +
requestURL.pathname,
module.exports.error.level.INFO
);
});
serve(config,
request,
response,
requestPath,
requestURL.pathname,
callback
);
});
return;
}
// If no authentication is required then serve the request.
process.nextTick(() => {
callback('Client: ' +
requestAddress.address + ':' +
requestAddress.port +
' accessing: ' +
requestURL.pathname,
module.exports.error.level.INFO
);
});
serve(config,
request,
response,
requestPath,
requestURL.pathname,
callback
);
});
});
}
};
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