node-http-server – Rev 11
?pathlinks?
#!/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');
// Checks whether userPath is a child of rootPath
function isRooted(userPath, rootPath, separator) {
userPath = userPath.split(separator).filter(Boolean);
rootPath = rootPath.split(separator).filter(Boolean);
return userPath.length >= rootPath.length &&
rootPath.every((e, i) => e === userPath[i]);
}
module.exports = {
error: {
level: {
INFO: 1,
WARN: 2,
ERROR: 3
}
},
process: (config, request, response, root, callback) => {
process.nextTick(() => {
const requestAddress = request.socket.address();
const requestedURL = url.parse(request.url, true);
process.nextTick(() => {
callback('Client: ' +
requestAddress.address + ':' +
requestAddress.port +
' accessing: ' +
requestedURL.pathname,
module.exports.error.level.INFO
);
});
const trimmedPath = requestedURL
.pathname
.split('/')
.filter(Boolean)
.join('/');
const filesystemPath = trimmedPath === '/' ?
path.join(root, trimmedPath) :
path.resolve(root, trimmedPath);
if (!isRooted(filesystemPath, root, path.sep)) {
process.nextTick(() => {
callback('Attempted path traversal: ' +
requestAddress.address + ':' +
requestAddress.port +
' requesting: ' +
requestedURL.pathname,
module.exports.error.level.WARN
);
});
response.statusCode = 403;
response.end();
return;
}
fs.stat(filesystemPath, (error, stats) => {
// Document does not exist.
if (error) {
response.statusCode = 404;
response.end();
return;
}
switch (stats.isDirectory()) {
case true: // Directory is requested so provide directory indexes.
const root = path.resolve(filesystemPath, config.site.index);
fs.stat(root, (error, stats) => {
if (error) {
fs.readdir(filesystemPath, (error, paths) => {
if (error) {
process.nextTick(() => {
callback('Could not list directory: ' +
filesystemPath,
module.exports.error.level.ERROR
);
});
response.statusCode = 500;
response.end();
return;
}
process.nextTick(() => {
callback('Directory listing requested for: ' +
filesystemPath,
module.exports.error.level.INFO
);
});
response.statusCode = 200;
response.write(JSON.stringify(paths));
response.end();
});
return;
}
fs.access(filesystemPath, fs.constants.R_OK, (error) => {
if (error) {
process.nextTick(() => {
callback('The server was unable to access the filesystem path: ' +
filesystemPath,
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();
});
});
});
break;
default: // Browser requesting file.
// Check if the file is accessible.
fs.access(filesystemPath, fs.constants.R_OK, (error) => {
if (error) {
response.statusCode = 403;
response.end();
return;
}
response.setHeader('Content-Type', mime.lookup(filesystemPath));
var readStream = fs.createReadStream(filesystemPath)
.on('open', () => {
response.statusCode = 200;
readStream.pipe(response);
})
.on('error', () => {
response.statusCode = 500;
response.end();
});
});
break;
}
})
});
}
};
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