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56 lines
1.5 KiB
56 lines
1.5 KiB
4 years ago
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module.exports = Extract;
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var Parse = require('./parse');
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var Writer = require('fstream').Writer;
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var path = require('path');
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var stream = require('stream');
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var duplexer2 = require('duplexer2');
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var Promise = require('bluebird');
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function Extract (opts) {
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// make sure path is normalized before using it
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opts.path = path.resolve(path.normalize(opts.path));
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var parser = new Parse(opts);
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var outStream = new stream.Writable({objectMode: true});
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outStream._write = function(entry, encoding, cb) {
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if (entry.type == 'Directory') return cb();
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// to avoid zip slip (writing outside of the destination), we resolve
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// the target path, and make sure it's nested in the intended
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// destination, or not extract it otherwise.
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var extractPath = path.join(opts.path, entry.path);
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if (extractPath.indexOf(opts.path) != 0) {
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return cb();
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}
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const writer = opts.getWriter ? opts.getWriter({path: extractPath}) : Writer({ path: extractPath });
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entry.pipe(writer)
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.on('error', cb)
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.on('close', cb);
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};
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var extract = duplexer2(parser,outStream);
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parser.once('crx-header', function(crxHeader) {
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extract.crxHeader = crxHeader;
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});
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parser
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.pipe(outStream)
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.on('finish',function() {
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extract.emit('close');
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});
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extract.promise = function() {
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return new Promise(function(resolve, reject) {
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extract.on('close', resolve);
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extract.on('error',reject);
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});
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};
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return extract;
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}
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