can1357
117e87df0d
- Replaced insufficient file size checks with comprehensive validation for ZIP header and length limits. - Added explicit rejection for archives that would exceed ZIP32 entry counts, name lengths, or total offsets. - Added validation for central directory size to prevent overflow before generating the EOCD record.
1092 lines
37 KiB
TypeScript
1092 lines
37 KiB
TypeScript
// The single archive boundary for the codebase: ZIP (framed here, over the raw
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// DEFLATE codec in `node:zlib`) and tar / tar.gz (via `Bun.Archive`). This is
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// the ONLY module that frames ZIP containers or touches `Bun.Archive`; the
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// markit document converters, the read/search/write tools, the URL fetcher, the
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// debug report bundler, and the tool-binary installer all go through here so
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// there is exactly one archive implementation to reason about. Do not parse or
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// build ZIP/tar, or call `Bun.Archive`, anywhere else.
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import * as path from "node:path";
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import * as zlib from "node:zlib";
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import { formatBytes } from "@oh-my-pi/pi-utils";
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import { ToolError } from "../tools/tool-errors";
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/** A ZIP archive decoded to a `path → bytes` map of its file members. */
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export type Unzipped = Record<string, Uint8Array>;
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const ENCODER = new TextEncoder();
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// `node:zlib` is only the DEFLATE codec; ZIP container framing is ours (see
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// `unzip` / `zip` below). Entry names use the platform text decoders.
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const UTF8_DECODER = new TextDecoder();
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// ZIP central-directory names without the UTF-8 flag carry no reliable encoding;
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// decode them as their legacy code page (windows-1252) as a stable best effort.
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const LEGACY_NAME_DECODER = new TextDecoder("windows-1252");
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/** Read a single ZIP entry as UTF-8 text, or `undefined` when the entry is absent. */
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export function unzipText(entries: Unzipped, entryPath: string): string | undefined {
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const data = entries[entryPath];
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return data ? UTF8_DECODER.decode(data) : undefined;
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}
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/**
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* Decode an in-memory ZIP archive into a `path → bytes` map of its file members
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* (directory entries and `..`-escaping names are dropped). Shares the
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* central-directory record parser with the lazy, file-backed reader.
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*/
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export function unzip(bytes: Uint8Array): Unzipped {
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const info = readCentralDirectoryInfoSync(bytes);
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const centralDirectory = readMemoryRange(bytes, info.offset, info.offset + info.size);
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const out: Unzipped = {};
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for (const entry of parseZipCentralDirectory(memoryByteSource(bytes), centralDirectory, info.entries)) {
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if (entry.isDirectory || entry.storage?.type !== "zip") continue;
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out[entry.path] = extractZipMember(bytes, entry.storage, entry.size);
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}
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return out;
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}
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/**
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* Cap on the on-disk size of tar/tar.gz archives, which are loaded fully into
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* memory (and decompressed by `Bun.Archive`) just to index entries. ZIP is
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* exempt: it is read via ranged central-directory access.
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*/
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const MAX_TAR_ARCHIVE_BYTES = 256 * 1024 * 1024;
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/**
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* Cap on a single archive member's declared (uncompressed) size. The declared
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* size is attacker-controlled metadata — a crafted ZIP entry can claim
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* multi-GB sizes that would be allocated up front before any data inflates.
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*/
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const MAX_ARCHIVE_MEMBER_BYTES = 64 * 1024 * 1024;
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/** Inflate one raw DEFLATE stream, bounded to its declared uncompressed size. */
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function inflateRaw(bytes: Uint8Array, declaredSize: number): Uint8Array {
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return zlib.inflateRawSync(bytes, { maxOutputLength: Math.max(declaredSize, 1) });
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}
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export type ArchiveFormat = "zip" | "tar" | "tar.gz";
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/**
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* Where to read an archive from: a filesystem path (format inferred from the
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* extension; ZIP is read lazily via ranged central-directory access) or
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* in-memory bytes with an explicit format.
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*/
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export type ArchiveSource = string | { bytes: Uint8Array; format: ArchiveFormat };
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/** Content for a member when packing or extracting an archive. */
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export type ArchiveMemberContent = string | Uint8Array | Blob;
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export interface ArchivePathCandidate {
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archivePath: string;
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subPath: string;
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}
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export interface ArchiveNode {
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path: string;
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isDirectory: boolean;
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size: number;
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mtimeMs?: number;
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}
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export interface ArchiveDirectoryEntry extends ArchiveNode {
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name: string;
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}
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export interface ExtractedArchiveFile extends ArchiveNode {
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bytes: Uint8Array;
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}
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/** A byte window into an archive — file-backed (lazy) or in-memory. */
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interface ByteSource {
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readonly size: number;
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read(start: number, end: number): Promise<Uint8Array>;
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}
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function assertValidRange(start: number, end: number): void {
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if (!Number.isSafeInteger(start) || !Number.isSafeInteger(end) || start < 0 || end < start) {
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throw new ToolError("Invalid ZIP archive range");
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}
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}
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/** Read an exact in-memory range, throwing (not clamping) when it runs past the buffer. */
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function readMemoryRange(buffer: Uint8Array, start: number, end: number): Uint8Array {
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assertValidRange(start, end);
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if (end > buffer.byteLength) {
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throw new ToolError("Invalid ZIP archive: truncated data");
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}
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return buffer.subarray(start, end);
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}
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function fileByteSource(filePath: string): ByteSource {
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const file = Bun.file(filePath);
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const size = file.size;
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if (!Number.isSafeInteger(size)) {
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throw new ToolError("ZIP archive is too large to read safely");
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}
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return {
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size,
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async read(start, end) {
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assertValidRange(start, end);
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const bytes = await file.slice(start, end).bytes();
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if (bytes.byteLength !== end - start) {
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throw new ToolError("Invalid ZIP archive: truncated data");
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}
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return bytes;
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},
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};
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}
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function memoryByteSource(buffer: Uint8Array): ByteSource {
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return {
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size: buffer.byteLength,
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async read(start, end) {
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return readMemoryRange(buffer, start, end);
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},
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};
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}
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interface TarStorage {
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type: "tar";
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file: File;
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}
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interface ZipStorage {
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type: "zip";
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source: ByteSource;
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compressedSize: number;
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compression: number;
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flags: number;
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localHeaderOffset: number;
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}
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type EntryStorage = TarStorage | ZipStorage;
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interface ArchiveIndexEntry extends ArchiveNode {
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storage?: EntryStorage;
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}
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function normalizeArchiveLookupPath(rawPath?: string): string | undefined {
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if (!rawPath) return "";
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const parts = rawPath.replace(/\\/g, "/").split("/");
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const normalizedParts: string[] = [];
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for (const part of parts) {
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if (!part || part === ".") continue;
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if (part === "..") return undefined;
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normalizedParts.push(part);
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}
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return normalizedParts.join("/");
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}
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function normalizeArchiveEntryPath(rawPath: string): string | undefined {
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const parts = rawPath.replace(/\\/g, "/").split("/");
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const normalizedParts: string[] = [];
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for (const part of parts) {
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if (!part || part === ".") continue;
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if (part === "..") return undefined;
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normalizedParts.push(part);
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}
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if (normalizedParts.length === 0) return undefined;
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return normalizedParts.join("/");
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}
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function isArchiveDirectoryName(rawPath: string): boolean {
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return rawPath.endsWith("/") || rawPath.endsWith("\\");
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}
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function upsertArchiveEntry(map: Map<string, ArchiveIndexEntry>, entry: ArchiveIndexEntry): void {
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const existing = map.get(entry.path);
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if (!existing) {
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map.set(entry.path, entry);
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return;
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}
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if (existing.isDirectory && !entry.isDirectory) {
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map.set(entry.path, entry);
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return;
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}
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if (!existing.isDirectory && entry.isDirectory) {
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return;
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}
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map.set(entry.path, {
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...existing,
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size: existing.size || entry.size,
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mtimeMs: existing.mtimeMs ?? entry.mtimeMs,
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storage: existing.storage ?? entry.storage,
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});
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}
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function ensureParentDirectories(map: Map<string, ArchiveIndexEntry>): void {
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for (const entry of [...map.values()]) {
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const parts = entry.path.split("/");
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const stop = parts.length - 1;
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for (let index = 1; index <= stop; index++) {
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const dirPath = parts.slice(0, index).join("/");
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if (!dirPath || map.has(dirPath)) continue;
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map.set(dirPath, {
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path: dirPath,
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isDirectory: true,
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size: 0,
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});
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}
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}
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}
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/** Infer an archive format from a filesystem path's extension. */
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export function archiveFormatFromPath(filePath: string): ArchiveFormat | undefined {
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const normalized = filePath.toLowerCase();
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if (normalized.endsWith(".tar.gz") || normalized.endsWith(".tgz")) return "tar.gz";
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if (normalized.endsWith(".tar")) return "tar";
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if (normalized.endsWith(".zip")) return "zip";
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return undefined;
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}
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export function formatArchiveEntryLines(entries: readonly ArchiveDirectoryEntry[]): string[] {
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return entries.map(entry => {
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if (entry.isDirectory) return `${entry.name}/`;
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const sizeSuffix = entry.size > 0 ? ` (${formatBytes(entry.size)})` : "";
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return `${entry.name}${sizeSuffix}`;
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});
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}
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const ZIP_LOCAL_FILE_HEADER_SIGNATURE = 0x04034b50;
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const ZIP_CENTRAL_DIRECTORY_HEADER_SIGNATURE = 0x02014b50;
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const ZIP64_EOCD_SIGNATURE = 0x06064b50;
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const ZIP64_EOCD_LOCATOR_SIGNATURE = 0x07064b50;
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const ZIP_EOCD_SIGNATURE = 0x06054b50;
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const ZIP_DATA_DESCRIPTOR_SIGNATURE = 0x08074b50;
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const ZIP_EOCD_MIN_LENGTH = 22;
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const ZIP_EOCD_MAX_COMMENT_LENGTH = 0xffff;
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const ZIP64_EOCD_LOCATOR_LENGTH = 20;
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const ZIP_STORED_COMPRESSION = 0;
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const ZIP_DEFLATE_COMPRESSION = 8;
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const ZIP_UTF8_FLAG = 0x0800;
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const ZIP_ENCRYPTED_FLAG = 0x0001;
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const ZIP_UINT16_MAX = 0xffff;
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const ZIP_UINT32_MAX = 0xffffffff;
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const ZIP_UINT32_RANGE = 0x100000000;
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interface ZipCentralDirectoryInfo {
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entries: number;
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offset: number;
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size: number;
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}
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interface Zip64EntryValues {
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compressedSize: number;
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uncompressedSize: number;
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localHeaderOffset: number;
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diskStart: number;
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}
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interface Zip64EntryPlaceholders {
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compressedSize: boolean;
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uncompressedSize: boolean;
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localHeaderOffset: boolean;
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diskStart: boolean;
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}
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function readUInt16LE(bytes: Uint8Array, offset: number): number {
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return bytes[offset]! | (bytes[offset + 1]! << 8);
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}
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function readUInt32LE(bytes: Uint8Array, offset: number): number {
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return (bytes[offset]! | (bytes[offset + 1]! << 8) | (bytes[offset + 2]! << 16) | (bytes[offset + 3]! << 24)) >>> 0;
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}
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function bytesMatchAscii(bytes: Uint8Array, offset: number, value: string): boolean {
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if (bytes.byteLength < offset + value.length) return false;
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for (let index = 0; index < value.length; index++) {
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if (bytes[offset + index] !== value.charCodeAt(index)) return false;
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}
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return true;
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}
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export function sniffArchiveFormat(bytes: Uint8Array): ArchiveFormat | undefined {
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if (bytes.byteLength >= 4) {
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const signature = readUInt32LE(bytes, 0);
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if (
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signature === ZIP_LOCAL_FILE_HEADER_SIGNATURE ||
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signature === ZIP_EOCD_SIGNATURE ||
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signature === ZIP_DATA_DESCRIPTOR_SIGNATURE
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) {
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return "zip";
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}
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}
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if (bytes.byteLength >= 2 && bytes[0] === 0x1f && bytes[1] === 0x8b) {
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return "tar.gz";
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}
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if (bytesMatchAscii(bytes, 257, "ustar")) {
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return "tar";
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}
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return undefined;
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}
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function readUInt64LEAsNumber(bytes: Uint8Array, offset: number): number {
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const value = readUInt32LE(bytes, offset) + readUInt32LE(bytes, offset + 4) * ZIP_UINT32_RANGE;
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if (!Number.isSafeInteger(value)) {
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throw new ToolError("ZIP archive uses offsets or sizes too large to read safely");
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}
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return value;
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}
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function findEndOfCentralDirectory(tail: Uint8Array): number {
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for (let offset = tail.byteLength - ZIP_EOCD_MIN_LENGTH; offset >= 0; offset--) {
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if (readUInt32LE(tail, offset) !== ZIP_EOCD_SIGNATURE) continue;
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const commentLength = readUInt16LE(tail, offset + 20);
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if (offset + ZIP_EOCD_MIN_LENGTH + commentLength === tail.byteLength) return offset;
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}
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throw new ToolError("Invalid ZIP archive: missing end of central directory");
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}
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async function readZip64CentralDirectoryInfo(
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source: ByteSource,
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tail: Uint8Array,
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tailStart: number,
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eocdOffset: number,
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): Promise<ZipCentralDirectoryInfo | undefined> {
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const locatorOffset = eocdOffset - ZIP64_EOCD_LOCATOR_LENGTH;
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if (locatorOffset < 0) return undefined;
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const locator =
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locatorOffset >= tailStart
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? tail.subarray(locatorOffset - tailStart, locatorOffset - tailStart + ZIP64_EOCD_LOCATOR_LENGTH)
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: await source.read(locatorOffset, eocdOffset);
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if (readUInt32LE(locator, 0) !== ZIP64_EOCD_LOCATOR_SIGNATURE) return undefined;
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const zip64EocdDisk = readUInt32LE(locator, 4);
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const zip64EocdOffset = readUInt64LEAsNumber(locator, 8);
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const totalDisks = readUInt32LE(locator, 16);
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if (zip64EocdDisk !== 0 || totalDisks > 1) {
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throw new ToolError("Multi-disk ZIP archives are not supported");
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}
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const record = await source.read(zip64EocdOffset, zip64EocdOffset + 56);
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if (readUInt32LE(record, 0) !== ZIP64_EOCD_SIGNATURE) {
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throw new ToolError("Invalid ZIP archive: missing ZIP64 end of central directory");
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}
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if (readUInt32LE(record, 16) !== 0 || readUInt32LE(record, 20) !== 0) {
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throw new ToolError("Multi-disk ZIP archives are not supported");
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}
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return {
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entries: readUInt64LEAsNumber(record, 32),
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size: readUInt64LEAsNumber(record, 40),
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offset: readUInt64LEAsNumber(record, 48),
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};
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}
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async function readZipCentralDirectoryInfo(source: ByteSource): Promise<ZipCentralDirectoryInfo> {
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const fileSize = source.size;
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if (fileSize < ZIP_EOCD_MIN_LENGTH) {
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throw new ToolError("Invalid ZIP archive: missing end of central directory");
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}
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const tailLength = Math.min(fileSize, ZIP_EOCD_MIN_LENGTH + ZIP_EOCD_MAX_COMMENT_LENGTH);
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const tailStart = fileSize - tailLength;
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const tail = await source.read(tailStart, fileSize);
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const eocdIndex = findEndOfCentralDirectory(tail);
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const eocdOffset = tailStart + eocdIndex;
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if (readUInt16LE(tail, eocdIndex + 4) !== 0 || readUInt16LE(tail, eocdIndex + 6) !== 0) {
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throw new ToolError("Multi-disk ZIP archives are not supported");
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}
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let entries = readUInt16LE(tail, eocdIndex + 10);
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let size = readUInt32LE(tail, eocdIndex + 12);
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let offset = readUInt32LE(tail, eocdIndex + 16);
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const needsZip64 = entries === ZIP_UINT16_MAX || size === ZIP_UINT32_MAX || offset === ZIP_UINT32_MAX;
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const zip64Info = await readZip64CentralDirectoryInfo(source, tail, tailStart, eocdOffset);
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if (zip64Info) {
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({ entries, size, offset } = zip64Info);
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} else if (needsZip64) {
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throw new ToolError("Invalid ZIP archive: missing ZIP64 central directory metadata");
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}
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if (offset + size > fileSize) {
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throw new ToolError("Invalid ZIP archive: central directory exceeds file size");
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}
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return { entries, offset, size };
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}
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|
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function readZip64EntryValues(
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extra: Uint8Array,
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placeholders: Zip64EntryPlaceholders,
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current: Zip64EntryValues,
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): Zip64EntryValues {
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if (
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!placeholders.compressedSize &&
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!placeholders.uncompressedSize &&
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!placeholders.localHeaderOffset &&
|
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!placeholders.diskStart
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) {
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return current;
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}
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|
|
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let offset = 0;
|
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while (offset + 4 <= extra.byteLength) {
|
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const headerId = readUInt16LE(extra, offset);
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|
const dataSize = readUInt16LE(extra, offset + 2);
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const dataStart = offset + 4;
|
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const dataEnd = dataStart + dataSize;
|
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if (dataEnd > extra.byteLength) {
|
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throw new ToolError("Invalid ZIP archive: malformed extra field");
|
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}
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|
|
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if (headerId === 0x0001) {
|
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let cursor = dataStart;
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let uncompressedSize = current.uncompressedSize;
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let compressedSize = current.compressedSize;
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let localHeaderOffset = current.localHeaderOffset;
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let diskStart = current.diskStart;
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|
|
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if (placeholders.uncompressedSize) {
|
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if (cursor + 8 > dataEnd) throw new ToolError("Invalid ZIP archive: malformed ZIP64 extra field");
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uncompressedSize = readUInt64LEAsNumber(extra, cursor);
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cursor += 8;
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}
|
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if (placeholders.compressedSize) {
|
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if (cursor + 8 > dataEnd) throw new ToolError("Invalid ZIP archive: malformed ZIP64 extra field");
|
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compressedSize = readUInt64LEAsNumber(extra, cursor);
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cursor += 8;
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}
|
|
if (placeholders.localHeaderOffset) {
|
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if (cursor + 8 > dataEnd) throw new ToolError("Invalid ZIP archive: malformed ZIP64 extra field");
|
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localHeaderOffset = readUInt64LEAsNumber(extra, cursor);
|
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cursor += 8;
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}
|
|
if (placeholders.diskStart) {
|
|
if (cursor + 4 > dataEnd) throw new ToolError("Invalid ZIP archive: malformed ZIP64 extra field");
|
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diskStart = readUInt32LE(extra, cursor);
|
|
}
|
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|
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return { compressedSize, uncompressedSize, localHeaderOffset, diskStart };
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}
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|
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offset = dataEnd;
|
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}
|
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|
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throw new ToolError("Invalid ZIP archive: missing ZIP64 extra field");
|
|
}
|
|
|
|
function parseZipCentralDirectory(
|
|
source: ByteSource,
|
|
centralDirectory: Uint8Array,
|
|
expectedEntries: number,
|
|
): ArchiveIndexEntry[] {
|
|
const entries: ArchiveIndexEntry[] = [];
|
|
let offset = 0;
|
|
|
|
for (let index = 0; index < expectedEntries; index++) {
|
|
if (offset + 46 > centralDirectory.byteLength) {
|
|
throw new ToolError("Invalid ZIP archive: truncated central directory");
|
|
}
|
|
if (readUInt32LE(centralDirectory, offset) !== ZIP_CENTRAL_DIRECTORY_HEADER_SIGNATURE) {
|
|
throw new ToolError("Invalid ZIP archive: malformed central directory");
|
|
}
|
|
|
|
const flags = readUInt16LE(centralDirectory, offset + 8);
|
|
const compression = readUInt16LE(centralDirectory, offset + 10);
|
|
const compressedSizeRaw = readUInt32LE(centralDirectory, offset + 20);
|
|
const uncompressedSizeRaw = readUInt32LE(centralDirectory, offset + 24);
|
|
const fileNameLength = readUInt16LE(centralDirectory, offset + 28);
|
|
const extraLength = readUInt16LE(centralDirectory, offset + 30);
|
|
const commentLength = readUInt16LE(centralDirectory, offset + 32);
|
|
const diskStartRaw = readUInt16LE(centralDirectory, offset + 34);
|
|
const localHeaderOffsetRaw = readUInt32LE(centralDirectory, offset + 42);
|
|
const nameStart = offset + 46;
|
|
const extraStart = nameStart + fileNameLength;
|
|
const entryEnd = extraStart + extraLength + commentLength;
|
|
if (entryEnd > centralDirectory.byteLength) {
|
|
throw new ToolError("Invalid ZIP archive: truncated central directory entry");
|
|
}
|
|
|
|
const useLegacyEncoding = (flags & ZIP_UTF8_FLAG) === 0;
|
|
const rawPath = (useLegacyEncoding ? LEGACY_NAME_DECODER : UTF8_DECODER).decode(
|
|
centralDirectory.subarray(nameStart, extraStart),
|
|
);
|
|
const normalizedPath = normalizeArchiveEntryPath(rawPath);
|
|
if (normalizedPath) {
|
|
const values = readZip64EntryValues(
|
|
centralDirectory.subarray(extraStart, extraStart + extraLength),
|
|
{
|
|
compressedSize: compressedSizeRaw === ZIP_UINT32_MAX,
|
|
uncompressedSize: uncompressedSizeRaw === ZIP_UINT32_MAX,
|
|
localHeaderOffset: localHeaderOffsetRaw === ZIP_UINT32_MAX,
|
|
diskStart: diskStartRaw === ZIP_UINT16_MAX,
|
|
},
|
|
{
|
|
compressedSize: compressedSizeRaw,
|
|
uncompressedSize: uncompressedSizeRaw,
|
|
localHeaderOffset: localHeaderOffsetRaw,
|
|
diskStart: diskStartRaw,
|
|
},
|
|
);
|
|
if (values.diskStart !== 0) {
|
|
throw new ToolError("Multi-disk ZIP archives are not supported");
|
|
}
|
|
|
|
const isDirectory = isArchiveDirectoryName(rawPath);
|
|
entries.push({
|
|
path: normalizedPath,
|
|
isDirectory,
|
|
size: isDirectory ? 0 : values.uncompressedSize,
|
|
storage: isDirectory
|
|
? undefined
|
|
: {
|
|
type: "zip",
|
|
source,
|
|
compressedSize: values.compressedSize,
|
|
compression,
|
|
flags,
|
|
localHeaderOffset: values.localHeaderOffset,
|
|
},
|
|
});
|
|
}
|
|
|
|
offset = entryEnd;
|
|
}
|
|
|
|
return entries;
|
|
}
|
|
|
|
/** Decode a single ZIP member's already-read payload, bounded to its declared size. */
|
|
function decodeZipMember(compressed: Uint8Array, compression: number, declaredSize: number): Uint8Array {
|
|
if (compression === ZIP_STORED_COMPRESSION) {
|
|
return compressed;
|
|
}
|
|
if (compression !== ZIP_DEFLATE_COMPRESSION) {
|
|
throw new ToolError(`Unsupported ZIP compression method: ${compression}`);
|
|
}
|
|
try {
|
|
return inflateRaw(compressed, declaredSize);
|
|
} catch (error) {
|
|
throw new ToolError(error instanceof Error ? error.message : String(error));
|
|
}
|
|
}
|
|
|
|
async function readZipFileBytes(storage: ZipStorage, uncompressedSize: number): Promise<Uint8Array> {
|
|
if ((storage.flags & ZIP_ENCRYPTED_FLAG) !== 0) {
|
|
throw new ToolError("Encrypted ZIP entries are not supported");
|
|
}
|
|
|
|
const localHeader = await storage.source.read(storage.localHeaderOffset, storage.localHeaderOffset + 30);
|
|
if (readUInt32LE(localHeader, 0) !== ZIP_LOCAL_FILE_HEADER_SIGNATURE) {
|
|
throw new ToolError("Invalid ZIP archive: malformed local file header");
|
|
}
|
|
|
|
const fileNameLength = readUInt16LE(localHeader, 26);
|
|
const extraLength = readUInt16LE(localHeader, 28);
|
|
const dataStart = storage.localHeaderOffset + 30 + fileNameLength + extraLength;
|
|
const compressedBytes = await storage.source.read(dataStart, dataStart + storage.compressedSize);
|
|
return decodeZipMember(compressedBytes, storage.compression, uncompressedSize);
|
|
}
|
|
|
|
async function readTarEntries(bytes: Uint8Array): Promise<ArchiveIndexEntry[]> {
|
|
let archive: Bun.Archive;
|
|
try {
|
|
archive = new Bun.Archive(bytes);
|
|
} catch (error) {
|
|
throw new ToolError(error instanceof Error ? error.message : String(error));
|
|
}
|
|
|
|
let files: Map<string, File>;
|
|
try {
|
|
files = await archive.files();
|
|
} catch (error) {
|
|
throw new ToolError(error instanceof Error ? error.message : String(error));
|
|
}
|
|
|
|
const entries: ArchiveIndexEntry[] = [];
|
|
for (const [rawPath, file] of files) {
|
|
const normalizedPath = normalizeArchiveEntryPath(rawPath);
|
|
if (!normalizedPath) continue;
|
|
const mtimeMs = file.lastModified > 0 ? file.lastModified : undefined;
|
|
entries.push({
|
|
path: normalizedPath,
|
|
isDirectory: false,
|
|
size: file.size,
|
|
mtimeMs,
|
|
storage: { type: "tar", file },
|
|
});
|
|
}
|
|
|
|
return entries;
|
|
}
|
|
|
|
async function readZipEntries(source: ByteSource): Promise<ArchiveIndexEntry[]> {
|
|
const directoryInfo = await readZipCentralDirectoryInfo(source);
|
|
const centralDirectory = await source.read(directoryInfo.offset, directoryInfo.offset + directoryInfo.size);
|
|
return parseZipCentralDirectory(source, centralDirectory, directoryInfo.entries);
|
|
}
|
|
|
|
/**
|
|
* Split an `archive.ext:inner/path` reference into every plausible
|
|
* `{ archivePath, subPath }` pair, longest archive prefix first. A path may
|
|
* contain more than one archive extension, so each candidate is a guess at
|
|
* where the archive ends and the member portion begins.
|
|
*/
|
|
export function parseArchivePathCandidates(filePath: string): ArchivePathCandidate[] {
|
|
const normalized = filePath.replace(/\\/g, "/");
|
|
const pattern = /\.(?:tar\.gz|tgz|zip|tar)(?=(?::|$))/gi;
|
|
const seen = new Set<string>();
|
|
const candidates: ArchivePathCandidate[] = [];
|
|
|
|
let match: RegExpExecArray | null;
|
|
while (true) {
|
|
match = pattern.exec(normalized);
|
|
if (match === null) {
|
|
break;
|
|
}
|
|
const end = match.index + match[0].length;
|
|
const archivePath = filePath.slice(0, end);
|
|
const subPath = normalized.slice(end).replace(/^:+/, "");
|
|
const key = `${archivePath}\0${subPath}`;
|
|
if (seen.has(key)) continue;
|
|
seen.add(key);
|
|
candidates.push({ archivePath, subPath });
|
|
}
|
|
|
|
return candidates.sort((left, right) => right.archivePath.length - left.archivePath.length);
|
|
}
|
|
|
|
/**
|
|
* An indexed, read-only view over a single archive. ZIP archives are indexed
|
|
* from the central directory and members are inflated on demand; tar archives
|
|
* are fully materialized by `Bun.Archive` up front.
|
|
*/
|
|
export class ArchiveReader {
|
|
readonly format: ArchiveFormat;
|
|
#entries = new Map<string, ArchiveIndexEntry>();
|
|
|
|
constructor(format: ArchiveFormat, entries: ArchiveIndexEntry[]) {
|
|
this.format = format;
|
|
for (const entry of entries) {
|
|
upsertArchiveEntry(this.#entries, entry);
|
|
}
|
|
ensureParentDirectories(this.#entries);
|
|
}
|
|
|
|
getNode(subPath?: string): ArchiveNode | undefined {
|
|
const normalizedPath = normalizeArchiveLookupPath(subPath);
|
|
if (normalizedPath === undefined) return undefined;
|
|
if (normalizedPath === "") {
|
|
return { path: "", isDirectory: true, size: 0 };
|
|
}
|
|
|
|
const entry = this.#entries.get(normalizedPath);
|
|
if (!entry) return undefined;
|
|
return {
|
|
path: entry.path,
|
|
isDirectory: entry.isDirectory,
|
|
size: entry.size,
|
|
mtimeMs: entry.mtimeMs,
|
|
};
|
|
}
|
|
|
|
listDirectory(subPath?: string): ArchiveDirectoryEntry[] {
|
|
const normalizedPath = normalizeArchiveLookupPath(subPath);
|
|
if (normalizedPath === undefined) {
|
|
throw new ToolError("Archive path cannot contain '..'");
|
|
}
|
|
|
|
if (normalizedPath) {
|
|
const entry = this.#entries.get(normalizedPath);
|
|
if (!entry) {
|
|
throw new ToolError(`Archive path '${normalizedPath}' not found`);
|
|
}
|
|
if (!entry.isDirectory) {
|
|
throw new ToolError(`Archive path '${normalizedPath}' is not a directory`);
|
|
}
|
|
}
|
|
|
|
const prefix = normalizedPath ? `${normalizedPath}/` : "";
|
|
const children = new Map<string, ArchiveDirectoryEntry>();
|
|
|
|
for (const entry of this.#entries.values()) {
|
|
if (normalizedPath) {
|
|
if (!entry.path.startsWith(prefix) || entry.path === normalizedPath) continue;
|
|
}
|
|
|
|
const relativePath = normalizedPath ? entry.path.slice(prefix.length) : entry.path;
|
|
const nextSegment = relativePath.split("/")[0];
|
|
if (!nextSegment) continue;
|
|
|
|
const childPath = normalizedPath ? `${normalizedPath}/${nextSegment}` : nextSegment;
|
|
if (children.has(childPath)) continue;
|
|
|
|
const childEntry = this.#entries.get(childPath);
|
|
const isDirectory = childEntry?.isDirectory ?? relativePath.includes("/");
|
|
children.set(childPath, {
|
|
name: nextSegment,
|
|
path: childPath,
|
|
isDirectory,
|
|
size: isDirectory ? 0 : (childEntry?.size ?? entry.size),
|
|
mtimeMs: childEntry?.mtimeMs ?? entry.mtimeMs,
|
|
});
|
|
}
|
|
|
|
return [...children.values()].sort((left, right) =>
|
|
left.name.toLowerCase().localeCompare(right.name.toLowerCase()),
|
|
);
|
|
}
|
|
|
|
async readFile(subPath: string): Promise<ExtractedArchiveFile> {
|
|
const normalizedPath = normalizeArchiveLookupPath(subPath);
|
|
if (!normalizedPath) {
|
|
throw new ToolError("Archive file path is required");
|
|
}
|
|
|
|
const entry = this.#entries.get(normalizedPath);
|
|
if (!entry) {
|
|
throw new ToolError(`Archive file '${normalizedPath}' not found`);
|
|
}
|
|
if (entry.isDirectory) {
|
|
throw new ToolError(`Archive path '${normalizedPath}' is a directory`);
|
|
}
|
|
if (!entry.storage) {
|
|
throw new ToolError(`Archive file '${normalizedPath}' has no readable storage`);
|
|
}
|
|
if (entry.size > MAX_ARCHIVE_MEMBER_BYTES) {
|
|
throw new ToolError(
|
|
`Archive member '${normalizedPath}' is too large to extract in memory (${formatBytes(entry.size)} > ${formatBytes(MAX_ARCHIVE_MEMBER_BYTES)} limit)`,
|
|
);
|
|
}
|
|
|
|
const bytes =
|
|
entry.storage.type === "tar"
|
|
? await entry.storage.file.bytes()
|
|
: await readZipFileBytes(entry.storage, entry.size);
|
|
|
|
return {
|
|
path: entry.path,
|
|
isDirectory: false,
|
|
size: entry.size,
|
|
mtimeMs: entry.mtimeMs,
|
|
bytes,
|
|
};
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Open an archive for reading. ZIP archives opened from a path are indexed
|
|
* lazily via ranged central-directory reads (members inflate on demand); tar
|
|
* archives and in-memory ZIPs are read from a single buffer.
|
|
*/
|
|
export async function openArchive(source: ArchiveSource): Promise<ArchiveReader> {
|
|
if (typeof source === "string") {
|
|
const format = archiveFormatFromPath(source);
|
|
if (!format) {
|
|
throw new ToolError(`Unsupported archive format: ${source}`);
|
|
}
|
|
if (format === "zip") {
|
|
return new ArchiveReader(format, await readZipEntries(fileByteSource(source)));
|
|
}
|
|
|
|
const file = Bun.file(source);
|
|
const archiveSize = file.size;
|
|
if (archiveSize > MAX_TAR_ARCHIVE_BYTES) {
|
|
throw new ToolError(
|
|
`Archive is too large to read in memory (${formatBytes(archiveSize)} > ${formatBytes(MAX_TAR_ARCHIVE_BYTES)} limit)`,
|
|
);
|
|
}
|
|
return new ArchiveReader(format, await readTarEntries(await file.bytes()));
|
|
}
|
|
|
|
const { bytes, format } = source;
|
|
if (format === "zip") {
|
|
return new ArchiveReader(format, await readZipEntries(memoryByteSource(bytes)));
|
|
}
|
|
if (bytes.byteLength > MAX_TAR_ARCHIVE_BYTES) {
|
|
throw new ToolError(
|
|
`Archive is too large to read in memory (${formatBytes(bytes.byteLength)} > ${formatBytes(MAX_TAR_ARCHIVE_BYTES)} limit)`,
|
|
);
|
|
}
|
|
return new ArchiveReader(format, await readTarEntries(bytes));
|
|
}
|
|
|
|
/** Render the top-level entries of an in-memory archive as one line each. */
|
|
export async function listArchiveRoot(
|
|
bytes: Uint8Array,
|
|
format: ArchiveFormat,
|
|
opts: { limit?: number } = {},
|
|
): Promise<string> {
|
|
const archive = await openArchive({ bytes, format });
|
|
const entries = archive.listDirectory("");
|
|
const limitedEntries = opts.limit !== undefined && opts.limit > 0 ? entries.slice(0, opts.limit) : entries;
|
|
const lines = formatArchiveEntryLines(limitedEntries);
|
|
return lines.length > 0 ? lines.join("\n") : "(empty archive directory)";
|
|
}
|
|
|
|
async function resolveArchiveBytes(source: ArchiveSource): Promise<{ bytes: Uint8Array; format: ArchiveFormat }> {
|
|
if (typeof source !== "string") return source;
|
|
const format = archiveFormatFromPath(source);
|
|
if (!format) {
|
|
throw new ToolError(`Unsupported archive format: ${source}`);
|
|
}
|
|
return { bytes: await Bun.file(source).bytes(), format };
|
|
}
|
|
|
|
async function memberToBytes(content: ArchiveMemberContent): Promise<Uint8Array> {
|
|
if (typeof content === "string") return ENCODER.encode(content);
|
|
if (content instanceof Uint8Array) return content;
|
|
return new Uint8Array(await content.arrayBuffer());
|
|
}
|
|
|
|
/**
|
|
* Fully materialize every file member into a `path → content` map: ZIP members
|
|
* are inflated in memory, tar members are returned as lazy `File`s. Use this
|
|
* when you need every entry (rewrite, extract); for browsing or single-member
|
|
* reads prefer `openArchive`, which is lazy for ZIP.
|
|
*/
|
|
export async function readArchiveEntries(source: ArchiveSource): Promise<Map<string, ArchiveMemberContent>> {
|
|
const { bytes, format } = await resolveArchiveBytes(source);
|
|
const entries = new Map<string, ArchiveMemberContent>();
|
|
if (format === "zip") {
|
|
const unzipped = unzip(bytes);
|
|
for (const name in unzipped) {
|
|
entries.set(name, unzipped[name]!);
|
|
}
|
|
return entries;
|
|
}
|
|
const files = await new Bun.Archive(bytes).files();
|
|
for (const [name, file] of files) {
|
|
entries.set(name.replace(/\\/g, "/"), file);
|
|
}
|
|
return entries;
|
|
}
|
|
|
|
/**
|
|
* Serialize `entries` into an archive of `format` and write it to `destPath`.
|
|
* ZIP is framed in memory, tar / tar.gz via `Bun.Archive` (gzip for tar.gz).
|
|
* String members are encoded as UTF-8.
|
|
*/
|
|
export async function writeArchive(
|
|
destPath: string,
|
|
format: ArchiveFormat,
|
|
entries: Iterable<readonly [string, ArchiveMemberContent]>,
|
|
): Promise<void> {
|
|
if (format === "zip") {
|
|
const record: Record<string, Uint8Array> = {};
|
|
for (const [name, content] of entries) {
|
|
record[name.replace(/\\/g, "/")] = await memberToBytes(content);
|
|
}
|
|
await Bun.write(destPath, zip(record));
|
|
return;
|
|
}
|
|
|
|
const record: Record<string, ArchiveMemberContent> = {};
|
|
for (const [name, content] of entries) {
|
|
record[name.replace(/\\/g, "/")] = content;
|
|
}
|
|
await Bun.Archive.write(destPath, record, format === "tar.gz" ? { compress: "gzip" } : undefined);
|
|
}
|
|
|
|
/**
|
|
* Extract every file member to `destDir`, creating parent directories as
|
|
* needed. Entries that would escape `destDir` (via `..` or an absolute path)
|
|
* are rejected. Returns the number of files written.
|
|
*/
|
|
export async function extractArchive(source: ArchiveSource, destDir: string): Promise<number> {
|
|
const extractRoot = path.resolve(destDir);
|
|
const entries = await readArchiveEntries(source);
|
|
let count = 0;
|
|
for (const [name, content] of entries) {
|
|
if (name.endsWith("/")) continue;
|
|
const outputPath = path.resolve(extractRoot, name);
|
|
if (!outputPath.startsWith(extractRoot + path.sep)) {
|
|
throw new ToolError(`Archive entry escapes extraction dir: ${name}`);
|
|
}
|
|
await Bun.write(outputPath, content);
|
|
count++;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
function writeUInt16LE(buf: Uint8Array, offset: number, value: number): void {
|
|
buf[offset] = value & 0xff;
|
|
buf[offset + 1] = (value >>> 8) & 0xff;
|
|
}
|
|
|
|
function writeUInt32LE(buf: Uint8Array, offset: number, value: number): void {
|
|
buf[offset] = value & 0xff;
|
|
buf[offset + 1] = (value >>> 8) & 0xff;
|
|
buf[offset + 2] = (value >>> 16) & 0xff;
|
|
buf[offset + 3] = (value >>> 24) & 0xff;
|
|
}
|
|
|
|
/**
|
|
* Frame a `path → bytes` map into a ZIP archive in memory. Each member is raw
|
|
* DEFLATE unless that would not shrink it, in which case it is stored. ZIP64 is
|
|
* not emitted; archives beyond the 32-bit limits throw rather than corrupt.
|
|
*/
|
|
export function zip(entries: Unzipped): Uint8Array {
|
|
const localParts: Uint8Array[] = [];
|
|
const centralParts: Uint8Array[] = [];
|
|
let offset = 0;
|
|
let count = 0;
|
|
|
|
for (const name in entries) {
|
|
const data = entries[name]!;
|
|
const nameBytes = ENCODER.encode(name);
|
|
const crc = zlib.crc32(data) >>> 0;
|
|
const uncompressedSize = data.byteLength;
|
|
const deflated = zlib.deflateRawSync(data);
|
|
const stored = deflated.byteLength >= uncompressedSize;
|
|
const method = stored ? ZIP_STORED_COMPRESSION : ZIP_DEFLATE_COMPRESSION;
|
|
const payload = stored ? data : deflated;
|
|
|
|
// Without ZIP64 the name length is a u16 and offsets/sizes are u32 (with
|
|
// 0xffff/0xffffffff reserved as ZIP64 sentinels); reject anything that
|
|
// would silently wrap a header field instead of producing a valid archive.
|
|
if (
|
|
count + 1 >= ZIP_UINT16_MAX ||
|
|
nameBytes.byteLength > ZIP_UINT16_MAX ||
|
|
uncompressedSize >= ZIP_UINT32_MAX ||
|
|
offset + 30 + nameBytes.byteLength + payload.byteLength >= ZIP_UINT32_MAX
|
|
) {
|
|
throw new ToolError("ZIP archive is too large to write (ZIP64 is not supported)");
|
|
}
|
|
|
|
const header = new Uint8Array(30 + nameBytes.byteLength);
|
|
writeUInt32LE(header, 0, ZIP_LOCAL_FILE_HEADER_SIGNATURE);
|
|
writeUInt16LE(header, 4, 20);
|
|
writeUInt16LE(header, 6, ZIP_UTF8_FLAG);
|
|
writeUInt16LE(header, 8, method);
|
|
// Fixed 1980-01-01 timestamp keeps the output deterministic.
|
|
writeUInt16LE(header, 12, 0x21);
|
|
writeUInt32LE(header, 14, crc);
|
|
writeUInt32LE(header, 18, payload.byteLength);
|
|
writeUInt32LE(header, 22, uncompressedSize);
|
|
writeUInt16LE(header, 26, nameBytes.byteLength);
|
|
header.set(nameBytes, 30);
|
|
localParts.push(header, payload);
|
|
|
|
const record = new Uint8Array(46 + nameBytes.byteLength);
|
|
writeUInt32LE(record, 0, ZIP_CENTRAL_DIRECTORY_HEADER_SIGNATURE);
|
|
writeUInt16LE(record, 4, 20);
|
|
writeUInt16LE(record, 6, 20);
|
|
writeUInt16LE(record, 8, ZIP_UTF8_FLAG);
|
|
writeUInt16LE(record, 10, method);
|
|
writeUInt16LE(record, 14, 0x21);
|
|
writeUInt32LE(record, 16, crc);
|
|
writeUInt32LE(record, 20, payload.byteLength);
|
|
writeUInt32LE(record, 24, uncompressedSize);
|
|
writeUInt16LE(record, 28, nameBytes.byteLength);
|
|
writeUInt32LE(record, 42, offset);
|
|
record.set(nameBytes, 46);
|
|
centralParts.push(record);
|
|
|
|
offset += header.byteLength + payload.byteLength;
|
|
count++;
|
|
}
|
|
|
|
const centralSize = centralParts.reduce((sum, part) => sum + part.byteLength, 0);
|
|
if (centralSize >= ZIP_UINT32_MAX || offset + centralSize + ZIP_EOCD_MIN_LENGTH >= ZIP_UINT32_MAX) {
|
|
throw new ToolError("ZIP archive is too large to write (ZIP64 is not supported)");
|
|
}
|
|
const eocd = new Uint8Array(ZIP_EOCD_MIN_LENGTH);
|
|
writeUInt32LE(eocd, 0, ZIP_EOCD_SIGNATURE);
|
|
writeUInt16LE(eocd, 8, count);
|
|
writeUInt16LE(eocd, 10, count);
|
|
writeUInt32LE(eocd, 12, centralSize);
|
|
writeUInt32LE(eocd, 16, offset);
|
|
|
|
const out = new Uint8Array(offset + centralSize + ZIP_EOCD_MIN_LENGTH);
|
|
let pos = 0;
|
|
for (const part of localParts) {
|
|
out.set(part, pos);
|
|
pos += part.byteLength;
|
|
}
|
|
for (const part of centralParts) {
|
|
out.set(part, pos);
|
|
pos += part.byteLength;
|
|
}
|
|
out.set(eocd, pos);
|
|
return out;
|
|
}
|
|
|
|
function readZip64CentralDirectoryInfoSync(bytes: Uint8Array, eocdOffset: number): ZipCentralDirectoryInfo | undefined {
|
|
const locatorOffset = eocdOffset - ZIP64_EOCD_LOCATOR_LENGTH;
|
|
if (locatorOffset < 0) return undefined;
|
|
|
|
const locator = readMemoryRange(bytes, locatorOffset, locatorOffset + ZIP64_EOCD_LOCATOR_LENGTH);
|
|
if (readUInt32LE(locator, 0) !== ZIP64_EOCD_LOCATOR_SIGNATURE) return undefined;
|
|
if (readUInt32LE(locator, 4) !== 0 || readUInt32LE(locator, 16) > 1) {
|
|
throw new ToolError("Multi-disk ZIP archives are not supported");
|
|
}
|
|
|
|
const zip64EocdOffset = readUInt64LEAsNumber(locator, 8);
|
|
const record = readMemoryRange(bytes, zip64EocdOffset, zip64EocdOffset + 56);
|
|
if (readUInt32LE(record, 0) !== ZIP64_EOCD_SIGNATURE) {
|
|
throw new ToolError("Invalid ZIP archive: missing ZIP64 end of central directory");
|
|
}
|
|
if (readUInt32LE(record, 16) !== 0 || readUInt32LE(record, 20) !== 0) {
|
|
throw new ToolError("Multi-disk ZIP archives are not supported");
|
|
}
|
|
|
|
return {
|
|
entries: readUInt64LEAsNumber(record, 32),
|
|
size: readUInt64LEAsNumber(record, 40),
|
|
offset: readUInt64LEAsNumber(record, 48),
|
|
};
|
|
}
|
|
|
|
function readCentralDirectoryInfoSync(bytes: Uint8Array): ZipCentralDirectoryInfo {
|
|
const fileSize = bytes.byteLength;
|
|
if (fileSize < ZIP_EOCD_MIN_LENGTH) {
|
|
throw new ToolError("Invalid ZIP archive: missing end of central directory");
|
|
}
|
|
|
|
const tailLength = Math.min(fileSize, ZIP_EOCD_MIN_LENGTH + ZIP_EOCD_MAX_COMMENT_LENGTH);
|
|
const tailStart = fileSize - tailLength;
|
|
const tail = readMemoryRange(bytes, tailStart, fileSize);
|
|
const eocdIndex = findEndOfCentralDirectory(tail);
|
|
|
|
if (readUInt16LE(tail, eocdIndex + 4) !== 0 || readUInt16LE(tail, eocdIndex + 6) !== 0) {
|
|
throw new ToolError("Multi-disk ZIP archives are not supported");
|
|
}
|
|
|
|
let entries = readUInt16LE(tail, eocdIndex + 10);
|
|
let size = readUInt32LE(tail, eocdIndex + 12);
|
|
let offset = readUInt32LE(tail, eocdIndex + 16);
|
|
const needsZip64 = entries === ZIP_UINT16_MAX || size === ZIP_UINT32_MAX || offset === ZIP_UINT32_MAX;
|
|
const zip64Info = readZip64CentralDirectoryInfoSync(bytes, tailStart + eocdIndex);
|
|
if (zip64Info) {
|
|
({ entries, size, offset } = zip64Info);
|
|
} else if (needsZip64) {
|
|
throw new ToolError("Invalid ZIP archive: missing ZIP64 central directory metadata");
|
|
}
|
|
|
|
if (offset + size > fileSize) {
|
|
throw new ToolError("Invalid ZIP archive: central directory exceeds file size");
|
|
}
|
|
|
|
return { entries, offset, size };
|
|
}
|
|
|
|
function extractZipMember(bytes: Uint8Array, storage: ZipStorage, uncompressedSize: number): Uint8Array {
|
|
if ((storage.flags & ZIP_ENCRYPTED_FLAG) !== 0) {
|
|
throw new ToolError("Encrypted ZIP entries are not supported");
|
|
}
|
|
|
|
const headerStart = storage.localHeaderOffset;
|
|
const localHeader = readMemoryRange(bytes, headerStart, headerStart + 30);
|
|
if (readUInt32LE(localHeader, 0) !== ZIP_LOCAL_FILE_HEADER_SIGNATURE) {
|
|
throw new ToolError("Invalid ZIP archive: malformed local file header");
|
|
}
|
|
|
|
const fileNameLength = readUInt16LE(localHeader, 26);
|
|
const extraLength = readUInt16LE(localHeader, 28);
|
|
const dataStart = headerStart + 30 + fileNameLength + extraLength;
|
|
const compressed = readMemoryRange(bytes, dataStart, dataStart + storage.compressedSize);
|
|
return decodeZipMember(compressed, storage.compression, uncompressedSize);
|
|
}
|