152 lines
4 KiB
JavaScript
152 lines
4 KiB
JavaScript
'use strict';
|
|
const path = require('path');
|
|
const fs = require('graceful-fs');
|
|
const decompressTar = require('decompress-tar');
|
|
const decompressTarbz2 = require('decompress-tarbz2');
|
|
const decompressTargz = require('decompress-targz');
|
|
const decompressUnzip = require('decompress-unzip');
|
|
const makeDir = require('make-dir');
|
|
const pify = require('pify');
|
|
const stripDirs = require('strip-dirs');
|
|
|
|
const fsP = pify(fs);
|
|
|
|
const runPlugins = (input, opts) => {
|
|
if (opts.plugins.length === 0) {
|
|
return Promise.resolve([]);
|
|
}
|
|
|
|
return Promise.all(opts.plugins.map(x => x(input, opts))).then(files => files.reduce((a, b) => a.concat(b)));
|
|
};
|
|
|
|
const safeMakeDir = (dir, realOutputPath) => {
|
|
return fsP.realpath(dir)
|
|
.catch(_ => {
|
|
const parent = path.dirname(dir);
|
|
return safeMakeDir(parent, realOutputPath);
|
|
})
|
|
.then(realParentPath => {
|
|
if (realParentPath.indexOf(realOutputPath) !== 0) {
|
|
throw (new Error('Refusing to create a directory outside the output path.'));
|
|
}
|
|
|
|
return makeDir(dir).then(fsP.realpath);
|
|
});
|
|
};
|
|
|
|
const preventWritingThroughSymlink = (destination, realOutputPath) => {
|
|
return fsP.readlink(destination)
|
|
.catch(_ => {
|
|
// Either no file exists, or it's not a symlink. In either case, this is
|
|
// not an escape we need to worry about in this phase.
|
|
return null;
|
|
})
|
|
.then(symlinkPointsTo => {
|
|
if (symlinkPointsTo) {
|
|
throw new Error('Refusing to write into a symlink');
|
|
}
|
|
|
|
// No symlink exists at `destination`, so we can continue
|
|
return realOutputPath;
|
|
});
|
|
};
|
|
|
|
const extractFile = (input, output, opts) => runPlugins(input, opts).then(files => {
|
|
if (opts.strip > 0) {
|
|
files = files
|
|
.map(x => {
|
|
x.path = stripDirs(x.path, opts.strip);
|
|
return x;
|
|
})
|
|
.filter(x => x.path !== '.');
|
|
}
|
|
|
|
if (typeof opts.filter === 'function') {
|
|
files = files.filter(opts.filter);
|
|
}
|
|
|
|
if (typeof opts.map === 'function') {
|
|
files = files.map(opts.map);
|
|
}
|
|
|
|
if (!output) {
|
|
return files;
|
|
}
|
|
|
|
return Promise.all(files.map(x => {
|
|
const dest = path.join(output, x.path);
|
|
const mode = x.mode & ~process.umask();
|
|
const now = new Date();
|
|
|
|
if (x.type === 'directory') {
|
|
return makeDir(output)
|
|
.then(outputPath => fsP.realpath(outputPath))
|
|
.then(realOutputPath => safeMakeDir(dest, realOutputPath))
|
|
.then(() => fsP.utimes(dest, now, x.mtime))
|
|
.then(() => x);
|
|
}
|
|
|
|
return makeDir(output)
|
|
.then(outputPath => fsP.realpath(outputPath))
|
|
.then(realOutputPath => {
|
|
// Attempt to ensure parent directory exists (failing if it's outside the output dir)
|
|
return safeMakeDir(path.dirname(dest), realOutputPath)
|
|
.then(() => realOutputPath);
|
|
})
|
|
.then(realOutputPath => {
|
|
if (x.type === 'file') {
|
|
return preventWritingThroughSymlink(dest, realOutputPath);
|
|
}
|
|
|
|
return realOutputPath;
|
|
})
|
|
.then(realOutputPath => {
|
|
return fsP.realpath(path.dirname(dest))
|
|
.then(realDestinationDir => {
|
|
if (realDestinationDir.indexOf(realOutputPath) !== 0) {
|
|
throw (new Error('Refusing to write outside output directory: ' + realDestinationDir));
|
|
}
|
|
});
|
|
})
|
|
.then(() => {
|
|
if (x.type === 'link') {
|
|
return fsP.link(x.linkname, dest);
|
|
}
|
|
|
|
if (x.type === 'symlink' && process.platform === 'win32') {
|
|
return fsP.link(x.linkname, dest);
|
|
}
|
|
|
|
if (x.type === 'symlink') {
|
|
return fsP.symlink(x.linkname, dest);
|
|
}
|
|
|
|
return fsP.writeFile(dest, x.data, {mode});
|
|
})
|
|
.then(() => x.type === 'file' && fsP.utimes(dest, now, x.mtime))
|
|
.then(() => x);
|
|
}));
|
|
});
|
|
|
|
module.exports = (input, output, opts) => {
|
|
if (typeof input !== 'string' && !Buffer.isBuffer(input)) {
|
|
return Promise.reject(new TypeError('Input file required'));
|
|
}
|
|
|
|
if (typeof output === 'object') {
|
|
opts = output;
|
|
output = null;
|
|
}
|
|
|
|
opts = Object.assign({plugins: [
|
|
decompressTar(),
|
|
decompressTarbz2(),
|
|
decompressTargz(),
|
|
decompressUnzip()
|
|
]}, opts);
|
|
|
|
const read = typeof input === 'string' ? fsP.readFile(input) : Promise.resolve(input);
|
|
|
|
return read.then(buf => extractFile(buf, output, opts));
|
|
};
|