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var PullStream = require('../PullStream');
var unzip = require('./unzip');
var Promise = require('bluebird');
var BufferStream = require('../BufferStream');
var parseExtraField = require('../parseExtraField');
var Buffer = require('../Buffer');
var path = require('path');
var Writer = require('fstream').Writer;
var parseDateTime = require('../parseDateTime');
var signature = Buffer.alloc(4);
signature.writeUInt32LE(0x06054b50,0);
function getCrxHeader(source) {
var sourceStream = source.stream(0).pipe(PullStream());
return sourceStream.pull(4).then(function(data) {
var signature = data.readUInt32LE(0);
Eif (signature === 0x34327243) {
var crxHeader;
return sourceStream.pull(12).then(function(data) {
crxHeader = binary.parse(data)
.word32lu('version')
.word32lu('pubKeyLength')
.word32lu('signatureLength')
.vars;
}).then(function() {
return sourceStream.pull(crxHeader.pubKeyLength +crxHeader.signatureLength);
}).then(function(data) {
crxHeader.publicKey = data.slice(0,crxHeader.pubKeyLength);
crxHeader.signature = data.slice(crxHeader.pubKeyLength);
crxHeader.size = 16 + crxHeader.pubKeyLength +crxHeader.signatureLength;
return crxHeader;
});
}
});
}
// Zip64 File Format Notes: https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT
function getZip64CentralDirectory(source, zip64CDL) {
var d64loc = binary.parse(zip64CDL)
.word32lu('signature')
.word32lu('diskNumber')
.word64lu('offsetToStartOfCentralDirectory')
.word32lu('numberOfDisks')
.vars;
Iif (d64loc.signature != 0x07064b50) {
throw new Error('invalid zip64 end of central dir locator signature (0x07064b50): 0x' + d64loc.signature.toString(16));
}
var dir64 = PullStream();
source.stream(d64loc.offsetToStartOfCentralDirectory).pipe(dir64);
return dir64.pull(56)
}
// Zip64 File Format Notes: https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT
function parseZip64DirRecord (dir64record) {
var vars = binary.parse(dir64record)
.word32lu('signature')
.word64lu('sizeOfCentralDirectory')
.word16lu('version')
.word16lu('versionsNeededToExtract')
.word32lu('diskNumber')
.word32lu('diskStart')
.word64lu('numberOfRecordsOnDisk')
.word64lu('numberOfRecords')
.word64lu('sizeOfCentralDirectory')
.word64lu('offsetToStartOfCentralDirectory')
.vars;
Iif (vars.signature != 0x06064b50) {
throw new Error('invalid zip64 end of central dir locator signature (0x06064b50): 0x0' + vars.signature.toString(16));
}
return vars
}
module.exports = function centralDirectory(source, options) {
var endDir = PullStream(),
records = PullStream(),
tailSize = (options && options.tailSize) || 80,
sourceSize,
crxHeader,
startOffset,
vars;
if (options && options.crx)
crxHeader = getCrxHeader(source);
return source.size()
.then(function(size) {
sourceSize = size;
source.stream(Math.max(0,size-tailSize))
.on('error', function (error) { endDir.emit('error', error) })
.pipe(endDir);
return endDir.pull(signature);
})
.then(function() {
return Promise.props({directory: endDir.pull(22), crxHeader: crxHeader});
})
.then(function(d) {
var data = d.directory;
startOffset = d.crxHeader && d.crxHeader.size || 0;
vars = binary.parse(data)
.word32lu('signature')
.word16lu('diskNumber')
.word16lu('diskStart')
.word16lu('numberOfRecordsOnDisk')
.word16lu('numberOfRecords')
.word32lu('sizeOfCentralDirectory')
.word32lu('offsetToStartOfCentralDirectory')
.word16lu('commentLength')
.vars;
// Is this zip file using zip64 format? Use same check as Go:
// https://github.com/golang/go/blob/master/src/archive/zip/reader.go#L503
// For zip64 files, need to find zip64 central directory locator header to extract
// relative offset for zip64 central directory record.
if (vars.numberOfRecords == 0xffff|| vars.numberOfRecords == 0xffff ||
vars.offsetToStartOfCentralDirectory == 0xffffffff) {
// Offset to zip64 CDL is 20 bytes before normal CDR
const zip64CDLSize = 20
const zip64CDLOffset = sourceSize - (tailSize - endDir.match + zip64CDLSize)
const zip64CDLStream = PullStream();
source.stream(zip64CDLOffset).pipe(zip64CDLStream);
return zip64CDLStream.pull(zip64CDLSize)
.then(function (d) { return getZip64CentralDirectory(source, d) })
.then(function (dir64record) {
vars = parseZip64DirRecord(dir64record)
})
} else {
vars.offsetToStartOfCentralDirectory += startOffset;
}
})
.then(function() {
source.stream(vars.offsetToStartOfCentralDirectory).pipe(records);
vars.extract = function(opts) {
Iif (!opts || !opts.path) throw new Error('PATH_MISSING');
return vars.files.then(function(files) {
return Promise.map(files, function(entry) {
if (entry.type == 'Directory') return;
// 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);
Iif (extractPath.indexOf(opts.path) != 0) {
return;
}
var writer = opts.getWriter ? opts.getWriter({path: extractPath}) : Writer({ path: extractPath });
return new Promise(function(resolve, reject) {
entry.stream(opts.password)
.on('error',reject)
.pipe(writer)
.on('close',resolve)
.on('error',reject);
});
}, opts.concurrency > 1 ? {concurrency: opts.concurrency || undefined} : undefined);
});
};
vars.files = Promise.mapSeries(Array(vars.numberOfRecords),function() {
return records.pull(46).then(function(data) {
var vars = binary.parse(data)
.word32lu('signature')
.word16lu('versionMadeBy')
.word16lu('versionsNeededToExtract')
.word16lu('flags')
.word16lu('compressionMethod')
.word16lu('lastModifiedTime')
.word16lu('lastModifiedDate')
.word32lu('crc32')
.word32lu('compressedSize')
.word32lu('uncompressedSize')
.word16lu('fileNameLength')
.word16lu('extraFieldLength')
.word16lu('fileCommentLength')
.word16lu('diskNumber')
.word16lu('internalFileAttributes')
.word32lu('externalFileAttributes')
.word32lu('offsetToLocalFileHeader')
.vars;
vars.offsetToLocalFileHeader += startOffset;
vars.lastModifiedDateTime = parseDateTime(vars.lastModifiedDate, vars.lastModifiedTime);
return records.pull(vars.fileNameLength).then(function(fileNameBuffer) {
vars.pathBuffer = fileNameBuffer;
vars.path = fileNameBuffer.toString('utf8');
vars.isUnicode = vars.flags & 0x11;
return records.pull(vars.extraFieldLength);
})
.then(function(extraField) {
vars.extra = parseExtraField(extraField, vars);
return records.pull(vars.fileCommentLength);
})
.then(function(comment) {
vars.comment = comment;
vars.type = (vars.uncompressedSize === 0 && /[\/\\]$/.test(vars.path)) ? 'Directory' : 'File';
vars.stream = function(_password) {
return unzip(source, vars.offsetToLocalFileHeader,_password, vars);
};
vars.buffer = function(_password) {
return BufferStream(vars.stream(_password));
};
return vars;
});
});
});
return Promise.props(vars);
});
};
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