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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 | 24x 24x 24x 24x 24x 24x 24x 11x 11x 11x 11x 34x 25x 25x 1x 24x 24x 11x 11x 1x 11x 9x 11x 2x 2x 2x 11x | 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.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;
}
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