You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
56 lines
1.5 KiB
56 lines
1.5 KiB
module.exports = Extract;
|
|
|
|
var Parse = require('./parse');
|
|
var Writer = require('fstream').Writer;
|
|
var path = require('path');
|
|
var stream = require('stream');
|
|
var duplexer2 = require('duplexer2');
|
|
var Promise = require('bluebird');
|
|
|
|
function Extract (opts) {
|
|
// make sure path is normalized before using it
|
|
opts.path = path.resolve(path.normalize(opts.path));
|
|
|
|
var parser = new Parse(opts);
|
|
|
|
var outStream = new stream.Writable({objectMode: true});
|
|
outStream._write = function(entry, encoding, cb) {
|
|
|
|
if (entry.type == 'Directory') return cb();
|
|
|
|
// to avoid zip slip (writing outside of the destination), we resolve
|
|
// the target path, and make sure it's nested in the intended
|
|
// destination, or not extract it otherwise.
|
|
var extractPath = path.join(opts.path, entry.path);
|
|
if (extractPath.indexOf(opts.path) != 0) {
|
|
return cb();
|
|
}
|
|
|
|
const writer = opts.getWriter ? opts.getWriter({path: extractPath}) : Writer({ path: extractPath });
|
|
|
|
entry.pipe(writer)
|
|
.on('error', cb)
|
|
.on('close', cb);
|
|
};
|
|
|
|
var extract = duplexer2(parser,outStream);
|
|
parser.once('crx-header', function(crxHeader) {
|
|
extract.crxHeader = crxHeader;
|
|
});
|
|
|
|
parser
|
|
.pipe(outStream)
|
|
.on('finish',function() {
|
|
extract.emit('close');
|
|
});
|
|
|
|
extract.promise = function() {
|
|
return new Promise(function(resolve, reject) {
|
|
extract.on('close', resolve);
|
|
extract.on('error',reject);
|
|
});
|
|
};
|
|
|
|
return extract;
|
|
}
|