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* This file is based on the extract-zip package (see https://github.com/max-mapper/extract-zip)
* The original code has been migrated to TypeScript, and the dependency get-stream has been removed.
* The dependency yauzl has been updated to the latest version.
*/
import { createWriteStream, promises as fs } from "node:fs";
import path from "node:path";
import { Readable, pipeline as nodePipeline } from "node:stream";
import { promisify } from "node:util";
import yauzl, { Entry, ZipFile } from "yauzl";
import { ensureError } from "./misc.js";
import { Response } from "undici";
const openZip = promisify(yauzl.open) as (
zipPath: string,
options: { lazyEntries: true },
) => Promise<ZipFile>;
const pipeline = promisify(nodePipeline) as (
source: Readable,
destination: NodeJS.WritableStream,
) => Promise<void>;
export interface ExtractOptions {
dir: string;
defaultDirMode?: string | number;
defaultFileMode?: string | number;
onEntry?: (entry: Entry, zipfile: ZipFile) => void;
}
class Extractor {
private zipfile!: ZipFile;
private canceled = false;
constructor(
private readonly zipPath: string,
private readonly opts: ExtractOptions,
) {}
async extract(): Promise<void> {
this.zipfile = await openZip(this.zipPath, { lazyEntries: true });
this.canceled = false;
return new Promise<void>((resolve, reject) => {
this.zipfile.on("error", (error: Error) => {
this.canceled = true;
reject(error);
});
this.zipfile.readEntry();
this.zipfile.on("close", () => {
if (!this.canceled) {
resolve();
}
});
// eslint-disable-next-line @typescript-eslint/no-misused-promises
this.zipfile.on("entry", async (entry: Entry) => {
/* istanbul ignore if */
if (this.canceled) {
return;
}
if (entry.fileName.startsWith("__MACOSX/")) {
this.zipfile.readEntry();
return;
}
const destDir = path.dirname(path.join(this.opts.dir, entry.fileName));
try {
await fs.mkdir(destDir, { recursive: true });
const canonicalDestDir = await fs.realpath(destDir);
const relativeDestDir = path.relative(
this.opts.dir,
canonicalDestDir,
);
if (relativeDestDir.split(path.sep).includes("..")) {
throw new Error(
`Out of bound path "${canonicalDestDir}" found while processing file ${entry.fileName}`,
);
}
await this.extractEntry(entry);
this.zipfile.readEntry();
} catch (error) {
this.canceled = true;
this.zipfile.close();
reject(ensureError(error));
}
});
});
}
private async extractEntry(entry: Entry): Promise<void> {
/* istanbul ignore if */
if (this.canceled) {
return;
}
if (this.opts.onEntry) {
this.opts.onEntry(entry, this.zipfile);
}
const dest = path.join(this.opts.dir, entry.fileName);
const mode = (entry.externalFileAttributes >> 16) & 0xffff;
const IFMT = 0o170000;
const IFDIR = 0o040000;
const IFLNK = 0o120000;
const symlink = (mode & IFMT) === IFLNK;
let isDir = (mode & IFMT) === IFDIR;
if (!isDir && entry.fileName.endsWith("/")) {
isDir = true;
}
const madeBy = entry.versionMadeBy >> 8;
if (!isDir) {
isDir = madeBy === 0 && entry.externalFileAttributes === 16;
}
const procMode = this.getExtractedMode(mode, isDir) & 0o777;
const destDir = isDir ? dest : path.dirname(dest);
const mkdirOptions: { recursive: true; mode?: number } = {
recursive: true,
};
if (isDir) {
mkdirOptions.mode = procMode;
}
await fs.mkdir(destDir, mkdirOptions);
if (isDir) {
return;
}
const openReadStream = promisify(
this.zipfile.openReadStream.bind(this.zipfile),
);
const readStream = await openReadStream(entry);
if (symlink) {
const link = await new Response(readStream).text();
await fs.symlink(link, dest);
return;
}
await pipeline(readStream, createWriteStream(dest, { mode: procMode }));
}
private getExtractedMode(entryMode: number, isDir: boolean): number {
let mode = entryMode;
if (mode === 0) {
if (isDir) {
if (this.opts.defaultDirMode !== undefined) {
mode = Number.parseInt(String(this.opts.defaultDirMode), 10);
}
if (!mode) {
mode = 0o755;
}
} else {
if (this.opts.defaultFileMode !== undefined) {
mode = Number.parseInt(String(this.opts.defaultFileMode), 10);
}
if (!mode) {
mode = 0o644;
}
}
}
return mode;
}
}
export default async function extract(
zipPath: string,
opts: ExtractOptions,
): Promise<void> {
if (!path.isAbsolute(opts.dir)) {
throw new Error("Target directory is expected to be absolute");
}
await fs.mkdir(opts.dir, { recursive: true });
opts.dir = await fs.realpath(opts.dir);
return new Extractor(zipPath, opts).extract();
}
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