| 1 | 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{ createFromBuffer } from \"chromium-pickle-js\"\nimport { close, open, read, readFile, Stats } from \"fs-extra\"\nimport * as path from \"path\"\n\nexport interface ReadAsarHeader {\n readonly header: string\n readonly size: number\n}\n\nexport interface NodeIntegrity {\n algorithm: \"SHA256\"\n hash: string\n blockSize: number\n blocks: Array<string>\n}\n\nexport class Node {\n // we don't use Map because later it will be stringified\n files?: { [key: string]: Node }\n\n unpacked?: boolean\n\n size?: number\n // electron expects string\n offset?: string\n\n executable?: boolean\n\n link?: string\n\n integrity?: NodeIntegrity\n}\n\nexport class AsarFilesystem {\n private offset = 0\n\n constructor(\n readonly src: string,\n readonly header = new Node(),\n readonly headerSize: number = -1\n ) {\n if (this.header.files == null) {\n this.header.files = {}\n }\n }\n\n searchNodeFromDirectory(p: string, isCreate: boolean): Node | null {\n let node = this.header\n for (const dir of p.split(path.sep)) {\n if (dir !== \".\") {\n let child = node.files![dir]\n if (child == null) {\n if (!isCreate) {\n return null\n }\n child = new Node()\n child.files = {}\n node.files![dir] = child\n }\n node = child\n }\n }\n return node\n }\n\n getOrCreateNode(p: string): Node {\n if (p == null || p.length === 0) {\n return this.header\n }\n\n const name = path.basename(p)\n const dirNode = this.searchNodeFromDirectory(path.dirname(p), true)!\n if (dirNode.files == null) {\n dirNode.files = {}\n }\n\n let result = dirNode.files[name]\n if (result == null) {\n result = new Node()\n dirNode.files[name] = result\n }\n return result\n }\n\n addFileNode(file: string, dirNode: Node, size: number, unpacked: boolean, stat: Stats, integrity?: NodeIntegrity): Node {\n if (size > 4294967295) {\n throw new Error(`${file}: file size cannot be larger than 4.2GB`)\n }\n\n const node = new Node()\n node.size = size\n if (integrity) {\n node.integrity = integrity\n }\n if (unpacked) {\n node.unpacked = true\n } else {\n // electron expects string\n node.offset = this.offset.toString()\n if (process.platform !== \"win32\" && stat.mode & 0o100) {\n node.executable = true\n }\n this.offset += node.size\n }\n\n let children = dirNode.files\n if (children == null) {\n children = {}\n dirNode.files = children\n }\n children[path.basename(file)] = node\n\n return node\n }\n\n getNode(p: string): Node | null {\n const node = this.searchNodeFromDirectory(path.dirname(p), false)!\n return node.files![path.basename(p)]\n }\n\n getFile(p: string, followLinks = true): Node {\n const info = this.getNode(p)!\n // if followLinks is false we don't resolve symlinks\n return followLinks && info.link != null ? this.getFile(info.link) : info\n }\n\n async readJson(file: string): Promise<any> {\n return JSON.parse((await this.readFile(file)).toString())\n }\n\n readFile(file: string): Promise<Buffer> {\n return readFileFromAsar(this, file, this.getFile(file))\n }\n}\n\nexport async function readAsarHeader(archive: string): Promise<ReadAsarHeader> {\n const fd = await open(archive, \"r\")\n let size: number\n let headerBuf\n try {\n const sizeBuf = Buffer.allocUnsafe(8)\n if ((await read(fd, sizeBuf, 0, 8, null as any)).bytesRead !== 8) {\n throw new Error(\"Unable to read header size\")\n }\n\n const sizePickle = createFromBuffer(sizeBuf)\n size = sizePickle.createIterator().readUInt32()\n headerBuf = Buffer.allocUnsafe(size)\n if ((await read(fd, headerBuf, 0, size, null as any)).bytesRead !== size) {\n throw new Error(\"Unable to read header\")\n }\n } finally {\n await close(fd)\n }\n\n const headerPickle = createFromBuffer(headerBuf)\n return { header: headerPickle.createIterator().readString(), size }\n}\n\nexport async function readAsar(archive: string): Promise<AsarFilesystem> {\n const { header, size } = await readAsarHeader(archive)\n return new AsarFilesystem(archive, JSON.parse(header), size)\n}\n\nexport async function readAsarJson(archive: string, file: string): Promise<any> {\n const fs = await readAsar(archive)\n return await fs.readJson(file)\n}\n\nasync function readFileFromAsar(filesystem: AsarFilesystem, filename: string, info: Node): Promise<Buffer> {\n const size = info.size!\n const buffer = Buffer.allocUnsafe(size)\n if (size <= 0) {\n return buffer\n }\n\n if (info.unpacked) {\n return await readFile(path.join(`${filesystem.src}.unpacked`, filename))\n }\n\n const fd = await open(filesystem.src, \"r\")\n try {\n const offset = 8 + filesystem.headerSize + parseInt(info.offset!, 10)\n await read(fd, buffer, 0, size, offset)\n } finally {\n await close(fd)\n }\n return buffer\n}\n"]} |