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'use strict'
const fs = require('./wrapped-fs')
const os = require('os')
const path = require('path')
const { promisify } = require('util')
const stream = require('stream')
const getFileIntegrity = require('./integrity')
const UINT32_MAX = 2 ** 32 - 1
const pipeline = promisify(stream.pipeline)
class Filesystem {
constructor (src) {
this.src = path.resolve(src)
this.header = { files: Object.create(null) }
this.offset = BigInt(0)
}
searchNodeFromDirectory (p) {
let json = this.header
const dirs = p.split(path.sep)
for (const dir of dirs) {
if (dir !== '.') {
if (!json.files[dir]) {
json.files[dir] = { files: Object.create(null) }
}
json = json.files[dir]
}
}
return json
}
searchNodeFromPath (p) {
p = path.relative(this.src, p)
if (!p) { return this.header }
const name = path.basename(p)
const node = this.searchNodeFromDirectory(path.dirname(p))
if (node.files == null) {
node.files = Object.create(null)
}
if (node.files[name] == null) {
node.files[name] = Object.create(null)
}
return node.files[name]
}
insertDirectory (p, shouldUnpack) {
const node = this.searchNodeFromPath(p)
if (shouldUnpack) {
node.unpacked = shouldUnpack
}
node.files = node.files || Object.create(null)
return node.files
}
async insertFile (p, shouldUnpack, file, options) {
const dirNode = this.searchNodeFromPath(path.dirname(p))
const node = this.searchNodeFromPath(p)
if (shouldUnpack || dirNode.unpacked) {
node.size = file.stat.size
node.unpacked = true
node.integrity = await getFileIntegrity(p)
return Promise.resolve()
}
let size
const transformed = options.transform && options.transform(p)
if (transformed) {
const tmpdir = await fs.mkdtemp(path.join(os.tmpdir(), 'asar-'))
const tmpfile = path.join(tmpdir, path.basename(p))
const out = fs.createWriteStream(tmpfile)
const readStream = fs.createReadStream(p)
await pipeline(readStream, transformed, out)
file.transformed = {
path: tmpfile,
stat: await fs.lstat(tmpfile)
}
size = file.transformed.stat.size
} else {
size = file.stat.size
}
// JavaScript cannot precisely present integers >= UINT32_MAX.
if (size > UINT32_MAX) {
throw new Error(`${p}: file size can not be larger than 4.2GB`)
}
node.size = size
node.offset = this.offset.toString()
node.integrity = await getFileIntegrity(p)
if (process.platform !== 'win32' && (file.stat.mode & 0o100)) {
node.executable = true
}
this.offset += BigInt(size)
}
insertLink (p) {
const link = path.relative(fs.realpathSync(this.src), fs.realpathSync(p))
if (link.substr(0, 2) === '..') {
throw new Error(`${p}: file "${link}" links out of the package`)
}
const node = this.searchNodeFromPath(p)
node.link = link
return link
}
listFiles (options) {
const files = []
const fillFilesFromMetadata = function (basePath, metadata) {
if (!metadata.files) {
return
}
for (const [childPath, childMetadata] of Object.entries(metadata.files)) {
const fullPath = path.join(basePath, childPath)
const packState = childMetadata.unpacked ? 'unpack' : 'pack '
files.push((options && options.isPack) ? `${packState} : ${fullPath}` : fullPath)
fillFilesFromMetadata(fullPath, childMetadata)
}
}
fillFilesFromMetadata('/', this.header)
return files
}
getNode (p) {
const node = this.searchNodeFromDirectory(path.dirname(p))
const name = path.basename(p)
if (name) {
return node.files[name]
} else {
return node
}
}
getFile (p, followLinks) {
followLinks = typeof followLinks === 'undefined' ? true : followLinks
const info = this.getNode(p)
// if followLinks is false we don't resolve symlinks
if (info.link && followLinks) {
return this.getFile(info.link)
} else {
return info
}
}
}
module.exports = Filesystem
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