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205
app/node_modules/extract-zip/index.js
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vendored
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205
app/node_modules/extract-zip/index.js
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var fs = require('fs')
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var path = require('path')
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var yauzl = require('yauzl')
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var mkdirp = require('mkdirp')
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var concat = require('concat-stream')
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var debug = require('debug')('extract-zip')
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module.exports = function (zipPath, opts, cb) {
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debug('creating target directory', opts.dir)
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if (path.isAbsolute(opts.dir) === false) {
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return cb(new Error('Target directory is expected to be absolute'))
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}
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mkdirp(opts.dir, function (err) {
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if (err) return cb(err)
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fs.realpath(opts.dir, function (err, canonicalDir) {
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if (err) return cb(err)
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opts.dir = canonicalDir
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openZip(opts)
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})
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})
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function openZip () {
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debug('opening', zipPath, 'with opts', opts)
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yauzl.open(zipPath, {lazyEntries: true}, function (err, zipfile) {
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if (err) return cb(err)
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var cancelled = false
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zipfile.readEntry()
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zipfile.on('close', function () {
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if (!cancelled) {
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debug('zip extraction complete')
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cb()
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}
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})
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zipfile.on('entry', function (entry) {
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if (cancelled) {
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debug('skipping entry', entry.fileName, {cancelled: cancelled})
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return
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}
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debug('zipfile entry', entry.fileName)
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if (/^__MACOSX\//.test(entry.fileName)) {
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// dir name starts with __MACOSX/
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zipfile.readEntry()
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return
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}
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var destDir = path.dirname(path.join(opts.dir, entry.fileName))
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mkdirp(destDir, function (err) {
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if (err) {
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cancelled = true
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zipfile.close()
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return cb(err)
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}
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fs.realpath(destDir, function (err, canonicalDestDir) {
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if (err) {
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cancelled = true
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zipfile.close()
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return cb(err)
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}
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var relativeDestDir = path.relative(opts.dir, canonicalDestDir)
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if (relativeDestDir.split(path.sep).indexOf('..') !== -1) {
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cancelled = true
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zipfile.close()
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return cb(new Error('Out of bound path "' + canonicalDestDir + '" found while processing file ' + entry.fileName))
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}
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extractEntry(entry, function (err) {
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// if any extraction fails then abort everything
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if (err) {
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cancelled = true
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zipfile.close()
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return cb(err)
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}
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debug('finished processing', entry.fileName)
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zipfile.readEntry()
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})
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})
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})
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})
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function extractEntry (entry, done) {
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if (cancelled) {
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debug('skipping entry extraction', entry.fileName, {cancelled: cancelled})
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return setImmediate(done)
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}
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if (opts.onEntry) {
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opts.onEntry(entry, zipfile)
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}
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var dest = path.join(opts.dir, entry.fileName)
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// convert external file attr int into a fs stat mode int
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var mode = (entry.externalFileAttributes >> 16) & 0xFFFF
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// check if it's a symlink or dir (using stat mode constants)
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var IFMT = 61440
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var IFDIR = 16384
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var IFLNK = 40960
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var symlink = (mode & IFMT) === IFLNK
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var isDir = (mode & IFMT) === IFDIR
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// Failsafe, borrowed from jsZip
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if (!isDir && entry.fileName.slice(-1) === '/') {
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isDir = true
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}
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// check for windows weird way of specifying a directory
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// https://github.com/maxogden/extract-zip/issues/13#issuecomment-154494566
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var madeBy = entry.versionMadeBy >> 8
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if (!isDir) isDir = (madeBy === 0 && entry.externalFileAttributes === 16)
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// if no mode then default to default modes
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if (mode === 0) {
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if (isDir) {
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if (opts.defaultDirMode) mode = parseInt(opts.defaultDirMode, 10)
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if (!mode) mode = 493 // Default to 0755
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} else {
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if (opts.defaultFileMode) mode = parseInt(opts.defaultFileMode, 10)
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if (!mode) mode = 420 // Default to 0644
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}
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}
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debug('extracting entry', { filename: entry.fileName, isDir: isDir, isSymlink: symlink })
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// reverse umask first (~)
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var umask = ~process.umask()
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// & with processes umask to override invalid perms
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var procMode = mode & umask
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// always ensure folders are created
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var destDir = dest
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if (!isDir) destDir = path.dirname(dest)
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debug('mkdirp', {dir: destDir})
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mkdirp(destDir, function (err) {
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if (err) {
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debug('mkdirp error', destDir, {error: err})
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cancelled = true
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return done(err)
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}
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if (isDir) return done()
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debug('opening read stream', dest)
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zipfile.openReadStream(entry, function (err, readStream) {
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if (err) {
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debug('openReadStream error', err)
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cancelled = true
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return done(err)
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}
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readStream.on('error', function (err) {
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console.log('read err', err)
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})
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if (symlink) writeSymlink()
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else writeStream()
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function writeStream () {
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var writeStream = fs.createWriteStream(dest, {mode: procMode})
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readStream.pipe(writeStream)
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writeStream.on('finish', function () {
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done()
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})
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writeStream.on('error', function (err) {
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debug('write error', {error: err})
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cancelled = true
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return done(err)
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})
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}
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// AFAICT the content of the symlink file itself is the symlink target filename string
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function writeSymlink () {
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readStream.pipe(concat(function (data) {
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var link = data.toString()
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debug('creating symlink', link, dest)
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fs.symlink(link, dest, function (err) {
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if (err) cancelled = true
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done(err)
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})
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}))
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}
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})
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})
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}
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})
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}
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}
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