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archiver.js
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archiver.js
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const fs = require('fs');
const path = require('path');
const config = require('./config.js');
const { exec } = require('child_process');
const destinationRootDirectory = config.documentFolderName;
const queueDirectory = config.queueFolderName;
const directoryBlacklist = config.directoryBlacklist;
let directoryCache = null;
// getQueueFileCollection
let getQueueFileCollectionService = (req, res) => {
filewalker(queueDirectory, queueDirectory, 1, null, true, false, function (err, files) {
if (err) throw err;
res.json(files);
});
};
// getArchiveFileCollection
let getArchiveFileCollectionService = (req, res) => {
var relativeDestinationDirectory = req.params.directoryName;
if (!relativeDestinationDirectory) throw new Error('missing mandatory parameter');
if (relativeDestinationDirectory.includes('..')) throw new Error('invalid parameter');
var destinationDirectory = path.join(destinationRootDirectory, relativeDestinationDirectory);
filewalker(destinationDirectory, destinationDirectory, 1, null, true, false, function (err, files) {
if (err) throw err;
res.json(files);
});
};
// putQueueFile
let putQueueFileService = (req, res) => {
var fileName = req.params.fileName;
var newfileName = req.query.newFileName;
var relativeDestinationDirectory = req.query.destination;
if (!fileName || !relativeDestinationDirectory || !newfileName) throw new Error('missing mandatory parameter');
if (fileName.includes('..') || relativeDestinationDirectory.includes('..') || newfileName.includes('..') || newfileName.includes('/')) throw new Error('invalid parameter');
var queueFileNameUnencrypted = path.join(queueDirectory, fileName);
var queueFileNameEncrypted = queueFileNameUnencrypted + '.gpg';
var destinationDirectory = path.join(destinationRootDirectory, relativeDestinationDirectory);
var destinationFileName = path.join(destinationDirectory, newfileName + '.gpg');
console.log('trying to move ' + fileName + ' to ' + relativeDestinationDirectory);
console.log('* q unencrypted ' + queueFileNameUnencrypted);
console.log('* q encrypted ' + queueFileNameEncrypted);
console.log('* destination dir ' + destinationDirectory);
console.log('* destination file ' + destinationFileName);
// destination is a directory
fs.stat(destinationDirectory, function(err, stat){
if (stat && stat.isDirectory()) {
// destination file is inaccessible? i.e. does not exist already?
fs.access(destinationFileName, function(err) {
if (err) {
console.log('destinationFileName does not exist yet');
var escapedFileName = escapeShellArg(path.join(queueDirectory, fileName));
const gpg = exec('gpg -r ' + config.gpgPublicKeyId + ' --always-trust --encrypt ' + escapedFileName + '', function(err) {
if (err) {
res.status(500).send('error executing gpg ' + err);
} else {
console.log('gpg executed');
// move encrypted file
move(queueFileNameEncrypted, destinationFileName, function (err) {
if (err) {
console.log(err);
res.status(500).send('error on moving file');
fs.unlink(queueFileNameEncrypted, function (err) {
if (err) {
res.status(500).send('error deleting encrypted file ' + err);
}
});
} else {
console.log('moved file to target');
// delete source file
fs.unlink(queueFileNameUnencrypted, function (err) {
if (err) {
res.status(500).send('error deleting source file ' + err);
} else {
console.log('queue file deleted');
}
});
// change target file's owner and group
if (config.fileUid && config.fileGid) {
fs.chown(destinationFileName, config.fileUid, config.fileGid, (error) => {
if (error) {
res.status(500).send('error changing uid+gid ' + error);
} else {
console.log('uid+gid set successfully');
res.status(204).send();
}
});
} else {
res.status(204).send();
}
}
});
}
});
} else {
console.log('target exists already');
res.status(400).send('file exists already at destination');
}
});
} else {
res.status(400).send('destination is no valid directory');
}
});
};
// getArchiveDirectoryCollection
let getArchiveDirectoryCollectionService = (req, res) => {
var parentDirectory = req.params.directoryName;
var directoryNamePattern = req.query.pattern ? req.query.pattern.toLowerCase() : "";
var depth = req.query.depth;
if (parentDirectory.includes('..') || (directoryNamePattern && directoryNamePattern.includes('..')) || (directoryNamePattern && directoryNamePattern.includes('/')) || !Number.isInteger(parseInt(depth)) || (depth < 0) || (depth > 25)) throw new Error('Invalid parameter or character used in search pattern');
if (directoryCache == null) {
updateArchiveDirectoryCache(function() {
res.json(getArchiveDirectoryCollection(parentDirectory, directoryNamePattern, depth));
}, 25);
} else {
res.json(getArchiveDirectoryCollection(parentDirectory, directoryNamePattern, depth));
}
};
function getArchiveDirectoryCollection(parentDirectory, directoryNamePattern, depth) {
parentDirectory = ("/" === parentDirectory) ? "" : parentDirectory;
return responseBódy = directoryCache.filter(cachedEntry => {
return cachedEntry.startsWith(parentDirectory) && // ensure correct parent directory
((cachedEntry.substr(parentDirectory.length + 1).split(path.sep).length - 1) < parseInt(depth)) && // part after parent directory considers depth
cachedEntry.substr(cachedEntry.lastIndexOf(path.sep) + 1).toLowerCase().includes(directoryNamePattern) && // consider search pattern in leaf
cachedEntry != parentDirectory // do not return parent directory itself
;
});
}
let updateArchiveDirectoryCacheService = (req, res) => {
var depth = req.query.depth;
if (!Number.isInteger(parseInt(depth)) || (depth < 0) || (depth > 25)) throw new Error('invalid parameter');
updateArchiveDirectoryCache(function() {res.json("ok");}, depth);
};
function updateArchiveDirectoryCache(onComplete, depth) {
filewalker(destinationRootDirectory, destinationRootDirectory, depth, null, false, true, function (err, dirs) {
if (err) throw err;
directoryCache = dirs;
onComplete();
});
}
function filewalker(dir, baseDir, levelToGo, directoryNamePattern, returnFiles, returnDirectories, done) {
let results = [];
fs.readdir(dir, function(err, list) {
if (err) return done(err);
var pending = list.length;
if ((!pending) || (levelToGo == 0)) return done(null, results);
list.forEach(function(file){
let fullFile = path.resolve(dir, file);
fs.stat(fullFile, function(err, stat){
if (stat && ((returnDirectories && stat.isDirectory()) || (returnFiles && !stat.isDirectory()))) {
if ((!directoryNamePattern || (directoryNamePattern && file.toLowerCase().includes(directoryNamePattern.toLowerCase()))) && (true)) {
results.push(path.relative(baseDir, fullFile));
}
if (stat.isDirectory()) {
filewalker(fullFile, baseDir, levelToGo - 1, directoryNamePattern, returnFiles, returnDirectories, function(err, res){
results = results.concat(res);
if (!--pending) done(null, results);
});
} else {
if (!--pending) done(null, results);
}
} else {
if (!--pending) done(null, results);
}
});
});
});
};
/**
* Replacement for fs.rename because it does not support renaming across different devices - which we may need.
*
* @see https://stackoverflow.com/a/29105404
*/
function move(oldPath, newPath, callback) {
fs.rename(oldPath, newPath, function (err) {
if (err) {
if (err.code === 'EXDEV') {
copy();
} else {
callback(err);
}
return;
}
callback();
});
function copy() {
var readStream = fs.createReadStream(oldPath);
var writeStream = fs.createWriteStream(newPath);
readStream.on('error', callback);
writeStream.on('error', callback);
readStream.on('close', function () {
fs.unlink(oldPath, callback);
});
readStream.pipe(writeStream);
}
}
let getConfigParameterService = (req, res) => {
var parameterName = req.params.parameterName;
var isDownload = req.query.download != null;
if (parameterName !== 'suggestions') throw new Error('invalid parameter name');
if (isDownload) {
res.set('Content-Disposition', 'attachment; filename=archiver-parameter-' + parameterName + '-' + new Date().toISOString().split('T')[0] + '.txt');
}
// we treat every parameter as string, therefore no conversion whatsoever
res.status(200).send(config[parameterName]);
};
let putConfigParameterService = (req, res) => {
var parameterName = req.params.parameterName;
var incomingData = '';
if (parameterName !== 'suggestions') throw new Error('invalid parameter name');
req.setEncoding('utf8');
req.on('data', function(chunk) { incomingData += chunk; });
// after data transmission has finished
req.on('end', function() {
var parameterValue = incomingData;
// we treat every parameter as string, therefore no conversion whatsoever
config[parameterName] = parameterValue;
res.status(200).send('config "' + parameterName + '" updated with ' + parameterValue);
});
};
exports.getQueueFileCollectionService = getQueueFileCollectionService;
exports.getArchiveDirectoryCollectionService = getArchiveDirectoryCollectionService;
exports.getArchiveFileCollectionService = getArchiveFileCollectionService;
exports.getConfigParameterService = getConfigParameterService;
exports.updateArchiveDirectoryCacheService = updateArchiveDirectoryCacheService;
exports.putConfigParameterService = putConfigParameterService;
exports.putQueueFileService = putQueueFileService;
function escapeShellArg (arg) {
return `"${arg.replace(/'/g, `'\\''`)}"`;
}