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