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/*!
* Tmp
*
* Copyright (c) 2011-2017 KARASZI Istvan <github@spam.raszi.hu>
*
* MIT Licensed
*/
/*
* Module dependencies.
*/
const fs = require('fs');
const path = require('path');
const crypto = require('crypto');
const osTmpDir = require('os-tmpdir');
const _c = process.binding('constants');
/*
* The working inner variables.
*/
const
/**
* The temporary directory.
* @type {string}
*/
tmpDir = osTmpDir(),
// the random characters to choose from
RANDOM_CHARS = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz',
TEMPLATE_PATTERN = /XXXXXX/,
DEFAULT_TRIES = 3,
CREATE_FLAGS = (_c.O_CREAT || _c.fs.O_CREAT) | (_c.O_EXCL || _c.fs.O_EXCL) | (_c.O_RDWR || _c.fs.O_RDWR),
EBADF = _c.EBADF || _c.os.errno.EBADF,
ENOENT = _c.ENOENT || _c.os.errno.ENOENT,
DIR_MODE = 448 /* 0o700 */,
FILE_MODE = 384 /* 0o600 */,
// this will hold the objects need to be removed on exit
_removeObjects = [];
var
_gracefulCleanup = false,
_uncaughtException = false;
/**
* Random name generator based on crypto.
* Adapted from http://blog.tompawlak.org/how-to-generate-random-values-nodejs-javascript
*
* @param {number} howMany
* @returns {string} the generated random name
* @private
*/
function _randomChars(howMany) {
var
value = [],
rnd = null;
// make sure that we do not fail because we ran out of entropy
try {
rnd = crypto.randomBytes(howMany);
} catch (e) {
rnd = crypto.pseudoRandomBytes(howMany);
}
for (var i = 0; i < howMany; i++) {
value.push(RANDOM_CHARS[rnd[i] % RANDOM_CHARS.length]);
}
return value.join('');
}
/**
* Checks whether the `obj` parameter is defined or not.
*
* @param {Object} obj
* @returns {boolean} true if the object is undefined
* @private
*/
function _isUndefined(obj) {
return typeof obj === 'undefined';
}
/**
* Parses the function arguments.
*
* This function helps to have optional arguments.
*
* @param {(Options|Function)} options
* @param {Function} callback
* @returns {Array} parsed arguments
* @private
*/
function _parseArguments(options, callback) {
if (typeof options == 'function') {
return [callback || {}, options];
}
if (_isUndefined(options)) {
return [{}, callback];
}
return [options, callback];
}
/**
* Generates a new temporary name.
*
* @param {Object} opts
* @returns {string} the new random name according to opts
* @private
*/
function _generateTmpName(opts) {
if (opts.name) {
return path.join(opts.dir || tmpDir, opts.name);
}
// mkstemps like template
if (opts.template) {
return opts.template.replace(TEMPLATE_PATTERN, _randomChars(6));
}
// prefix and postfix
const name = [
opts.prefix || 'tmp-',
process.pid,
_randomChars(12),
opts.postfix || ''
].join('');
return path.join(opts.dir || tmpDir, name);
}
/**
* Gets a temporary file name.
*
* @param {(Options|tmpNameCallback)} options options or callback
* @param {?tmpNameCallback} callback the callback function
*/
function tmpName(options, callback) {
var
args = _parseArguments(options, callback),
opts = args[0],
cb = args[1],
tries = opts.name ? 1 : opts.tries || DEFAULT_TRIES;
if (isNaN(tries) || tries < 0)
return cb(new Error('Invalid tries'));
if (opts.template && !opts.template.match(TEMPLATE_PATTERN))
return cb(new Error('Invalid template provided'));
(function _getUniqueName() {
const name = _generateTmpName(opts);
// check whether the path exists then retry if needed
fs.stat(name, function (err) {
if (!err) {
if (tries-- > 0) return _getUniqueName();
return cb(new Error('Could not get a unique tmp filename, max tries reached ' + name));
}
cb(null, name);
});
}());
}
/**
* Synchronous version of tmpName.
*
* @param {Object} options
* @returns {string} the generated random name
* @throws {Error} if the options are invalid or could not generate a filename
*/
function tmpNameSync(options) {
var
args = _parseArguments(options),
opts = args[0],
tries = opts.name ? 1 : opts.tries || DEFAULT_TRIES;
if (isNaN(tries) || tries < 0)
throw new Error('Invalid tries');
if (opts.template && !opts.template.match(TEMPLATE_PATTERN))
throw new Error('Invalid template provided');
do {
const name = _generateTmpName(opts);
try {
fs.statSync(name);
} catch (e) {
return name;
}
} while (tries-- > 0);
throw new Error('Could not get a unique tmp filename, max tries reached');
}
/**
* Creates and opens a temporary file.
*
* @param {(Options|fileCallback)} options the config options or the callback function
* @param {?fileCallback} callback
*/
function file(options, callback) {
var
args = _parseArguments(options, callback),
opts = args[0],
cb = args[1];
opts.postfix = (_isUndefined(opts.postfix)) ? '.tmp' : opts.postfix;
// gets a temporary filename
tmpName(opts, function _tmpNameCreated(err, name) {
if (err) return cb(err);
// create and open the file
fs.open(name, CREATE_FLAGS, opts.mode || FILE_MODE, function _fileCreated(err, fd) {
if (err) return cb(err);
if (opts.discardDescriptor) {
return fs.close(fd, function _discardCallback(err) {
if (err) {
// Low probability, and the file exists, so this could be
// ignored. If it isn't we certainly need to unlink the
// file, and if that fails too its error is more
// important.
try {
fs.unlinkSync(name);
} catch (e) {
if (!isENOENT(e)) {
err = e;
}
}
return cb(err);
}
cb(null, name, undefined, _prepareTmpFileRemoveCallback(name, -1, opts));
});
}
if (opts.detachDescriptor) {
return cb(null, name, fd, _prepareTmpFileRemoveCallback(name, -1, opts));
}
cb(null, name, fd, _prepareTmpFileRemoveCallback(name, fd, opts));
});
});
}
/**
* Synchronous version of file.
*
* @param {Options} options
* @returns {FileSyncObject} object consists of name, fd and removeCallback
* @throws {Error} if cannot create a file
*/
function fileSync(options) {
var
args = _parseArguments(options),
opts = args[0];
opts.postfix = opts.postfix || '.tmp';
const discardOrDetachDescriptor = opts.discardDescriptor || opts.detachDescriptor;
const name = tmpNameSync(opts);
var fd = fs.openSync(name, CREATE_FLAGS, opts.mode || FILE_MODE);
if (opts.discardDescriptor) {
fs.closeSync(fd);
fd = undefined;
}
return {
name: name,
fd: fd,
removeCallback: _prepareTmpFileRemoveCallback(name, discardOrDetachDescriptor ? -1 : fd, opts)
};
}
/**
* Removes files and folders in a directory recursively.
*
* @param {string} root
* @private
*/
function _rmdirRecursiveSync(root) {
const dirs = [root];
do {
var
dir = dirs.pop(),
deferred = false,
files = fs.readdirSync(dir);
for (var i = 0, length = files.length; i < length; i++) {
var
file = path.join(dir, files[i]),
stat = fs.lstatSync(file); // lstat so we don't recurse into symlinked directories
if (stat.isDirectory()) {
if (!deferred) {
deferred = true;
dirs.push(dir);
}
dirs.push(file);
} else {
fs.unlinkSync(file);
}
}
if (!deferred) {
fs.rmdirSync(dir);
}
} while (dirs.length !== 0);
}
/**
* Creates a temporary directory.
*
* @param {(Options|dirCallback)} options the options or the callback function
* @param {?dirCallback} callback
*/
function dir(options, callback) {
var
args = _parseArguments(options, callback),
opts = args[0],
cb = args[1];
// gets a temporary filename
tmpName(opts, function _tmpNameCreated(err, name) {
if (err) return cb(err);
// create the directory
fs.mkdir(name, opts.mode || DIR_MODE, function _dirCreated(err) {
if (err) return cb(err);
cb(null, name, _prepareTmpDirRemoveCallback(name, opts));
});
});
}
/**
* Synchronous version of dir.
*
* @param {Options} options
* @returns {DirSyncObject} object consists of name and removeCallback
* @throws {Error} if it cannot create a directory
*/
function dirSync(options) {
var
args = _parseArguments(options),
opts = args[0];
const name = tmpNameSync(opts);
fs.mkdirSync(name, opts.mode || DIR_MODE);
return {
name: name,
removeCallback: _prepareTmpDirRemoveCallback(name, opts)
};
}
/**
* Prepares the callback for removal of the temporary file.
*
* @param {string} name the path of the file
* @param {number} fd file descriptor
* @param {Object} opts
* @returns {fileCallback}
* @private
*/
function _prepareTmpFileRemoveCallback(name, fd, opts) {
const removeCallback = _prepareRemoveCallback(function _removeCallback(fdPath) {
try {
if (0 <= fdPath[0]) {
fs.closeSync(fdPath[0]);
}
}
catch (e) {
// under some node/windows related circumstances, a temporary file
// may have not be created as expected or the file was already closed
// by the user, in which case we will simply ignore the error
if (!isEBADF(e) && !isENOENT(e)) {
// reraise any unanticipated error
throw e;
}
}
try {
fs.unlinkSync(fdPath[1]);
}
catch (e) {
if (!isENOENT(e)) {
// reraise any unanticipated error
throw e;
}
}
}, [fd, name]);
if (!opts.keep) {
_removeObjects.unshift(removeCallback);
}
return removeCallback;
}
/**
* Prepares the callback for removal of the temporary directory.
*
* @param {string} name
* @param {Object} opts
* @returns {Function} the callback
* @private
*/
function _prepareTmpDirRemoveCallback(name, opts) {
const removeFunction = opts.unsafeCleanup ? _rmdirRecursiveSync : fs.rmdirSync.bind(fs);
const removeCallback = _prepareRemoveCallback(removeFunction, name);
if (!opts.keep) {
_removeObjects.unshift(removeCallback);
}
return removeCallback;
}
/**
* Creates a guarded function wrapping the removeFunction call.
*
* @param {Function} removeFunction
* @param {Object} arg
* @returns {Function}
* @private
*/
function _prepareRemoveCallback(removeFunction, arg) {
var called = false;
return function _cleanupCallback(next) {
if (!called) {
const index = _removeObjects.indexOf(_cleanupCallback);
if (index >= 0) {
_removeObjects.splice(index, 1);
}
called = true;
removeFunction(arg);
}
if (next) next(null);
};
}
/**
* The garbage collector.
*
* @private
*/
function _garbageCollector() {
if (_uncaughtException && !_gracefulCleanup) {
return;
}
// the function being called removes itself from _removeObjects,
// loop until _removeObjects is empty
while (_removeObjects.length) {
try {
_removeObjects[0].call(null);
} catch (e) {
// already removed?
}
}
}
/**
* Helper for testing against EBADF to compensate changes made to Node 7.x under Windows.
*/
function isEBADF(error) {
return isExpectedError(error, -EBADF, 'EBADF');
}
/**
* Helper for testing against ENOENT to compensate changes made to Node 7.x under Windows.
*/
function isENOENT(error) {
return isExpectedError(error, -ENOENT, 'ENOENT');
}
/**
* Helper to determine whether the expected error code matches the actual code and errno,
* which will differ between the supported node versions.
*
* - Node >= 7.0:
* error.code {String}
* error.errno {String|Number} any numerical value will be negated
*
* - Node >= 6.0 < 7.0:
* error.code {String}
* error.errno {Number} negated
*
* - Node >= 4.0 < 6.0: introduces SystemError
* error.code {String}
* error.errno {Number} negated
*
* - Node >= 0.10 < 4.0:
* error.code {Number} negated
* error.errno n/a
*/
function isExpectedError(error, code, errno) {
return error.code == code || error.code == errno;
}
/**
* Sets the graceful cleanup.
*
* Also removes the created files and directories when an uncaught exception occurs.
*/
function setGracefulCleanup() {
_gracefulCleanup = true;
}
const version = process.versions.node.split('.').map(function (value) {
return parseInt(value, 10);
});
if (version[0] === 0 && (version[1] < 9 || version[1] === 9 && version[2] < 5)) {
process.addListener('uncaughtException', function _uncaughtExceptionThrown(err) {
_uncaughtException = true;
_garbageCollector();
throw err;
});
}
process.addListener('exit', function _exit(code) {
if (code) _uncaughtException = true;
_garbageCollector();
});
/**
* Configuration options.
*
* @typedef {Object} Options
* @property {?number} tries the number of tries before give up the name generation
* @property {?string} template the "mkstemp" like filename template
* @property {?string} name fix name
* @property {?string} dir the tmp directory to use
* @property {?string} prefix prefix for the generated name
* @property {?string} postfix postfix for the generated name
*/
/**
* @typedef {Object} FileSyncObject
* @property {string} name the name of the file
* @property {string} fd the file descriptor
* @property {fileCallback} removeCallback the callback function to remove the file
*/
/**
* @typedef {Object} DirSyncObject
* @property {string} name the name of the directory
* @property {fileCallback} removeCallback the callback function to remove the directory
*/
/**
* @callback tmpNameCallback
* @param {?Error} err the error object if anything goes wrong
* @param {string} name the temporary file name
*/
/**
* @callback fileCallback
* @param {?Error} err the error object if anything goes wrong
* @param {string} name the temporary file name
* @param {number} fd the file descriptor
* @param {cleanupCallback} fn the cleanup callback function
*/
/**
* @callback dirCallback
* @param {?Error} err the error object if anything goes wrong
* @param {string} name the temporary file name
* @param {cleanupCallback} fn the cleanup callback function
*/
/**
* Removes the temporary created file or directory.
*
* @callback cleanupCallback
* @param {simpleCallback} [next] function to call after entry was removed
*/
/**
* Callback function for function composition.
* @see {@link https://github.com/raszi/node-tmp/issues/57|raszi/node-tmp#57}
*
* @callback simpleCallback
*/
// exporting all the needed methods
module.exports.tmpdir = tmpDir;
module.exports.dir = dir;
module.exports.dirSync = dirSync;
module.exports.file = file;
module.exports.fileSync = fileSync;
module.exports.tmpName = tmpName;
module.exports.tmpNameSync = tmpNameSync;
module.exports.setGracefulCleanup = setGracefulCleanup;