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"@phosphor-icons/react": "^2.1.10", "@prisma/client": "^6.19.3", + "adm-zip": "^0.6.0", + "archiver": "^8.0.0", "docx": "^9.7.1", "dotenv": "^17.4.2", "exceljs": "^4.4.0", diff --git a/src/converters/archive.js b/src/converters/archive.js new file mode 100644 index 0000000..e5a3dcc --- /dev/null +++ b/src/converters/archive.js @@ -0,0 +1,85 @@ +import fs from 'node:fs/promises'; +import { createWriteStream } from 'node:fs'; +import path from 'node:path'; +import os from 'node:os'; +import AdmZip from 'adm-zip'; +import { ZipArchive } from 'archiver'; +import { register } from './registry.js'; + +const MAX_EXTRACTED_BYTES = 2 * 1024 * 1024 * 1024; + +export async function assertNoPathEscape(extractDir) { + const resolvedRoot = await fs.realpath(extractDir); + const entries = await fs.readdir(extractDir, { recursive: true, withFileTypes: true }); + for (const entry of entries) { + const fullPath = path.join(entry.parentPath, entry.name); + const real = entry.isSymbolicLink() ? await fs.realpath(fullPath) : fullPath; + if (real !== resolvedRoot && !real.startsWith(resolvedRoot + path.sep)) { + throw new Error('Archive entry escapes extraction directory'); + } + } +} + +async function extractZip(inputPath, destDir) { + const zip = new AdmZip(inputPath); + let totalBytes = 0; + for (const entry of zip.getEntries()) { + const targetPath = path.join(destDir, entry.entryName); + if (targetPath !== destDir && !targetPath.startsWith(destDir + path.sep)) { + throw new Error('Archive entry escapes extraction directory'); + } + if (entry.isDirectory) { + await fs.mkdir(targetPath, { recursive: true }); + continue; + } + totalBytes += entry.header.size; + if (totalBytes > MAX_EXTRACTED_BYTES) { + throw new Error('Archive exceeds maximum extracted size'); + } + await fs.mkdir(path.dirname(targetPath), { recursive: true }); + await fs.writeFile(targetPath, entry.getData()); + } +} + +function createZip(srcDir, outputPath, quality) { + return new Promise((resolvePromise, reject) => { + const output = createWriteStream(outputPath); + const archive = new ZipArchive({ zlib: { level: quality ?? 6 } }); + output.on('close', resolvePromise); + archive.on('error', reject); + archive.pipe(output); + archive.directory(srcDir, false); + archive.finalize(); + }); +} + +const EXTRACTORS = { zip: extractZip }; +const CREATORS = { zip: createZip }; + +async function convert(inputPath, outputPath, options, sourceFormat, targetFormat) { + const { quality } = options ?? {}; + const tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), 'archive-convert-')); + try { + const extractDir = path.join(tmpDir, 'extracted'); + await fs.mkdir(extractDir, { recursive: true }); + await EXTRACTORS[sourceFormat](inputPath, extractDir); + await assertNoPathEscape(extractDir); + await CREATORS[targetFormat](extractDir, outputPath, quality); + } finally { + await fs.rm(tmpDir, { recursive: true, force: true }); + } +} + +export function registerArchiveConverters() { + for (const sourceFormat of Object.keys(EXTRACTORS)) { + for (const targetFormat of Object.keys(CREATORS)) { + register({ + family: 'archive', + sourceFormat, + targetFormat, + convert: (inputPath, outputPath, options) => + convert(inputPath, outputPath, options, sourceFormat, targetFormat), + }); + } + } +} diff --git a/test/converters/archive.test.js b/test/converters/archive.test.js new file mode 100644 index 0000000..cb3b08c --- /dev/null +++ b/test/converters/archive.test.js @@ -0,0 +1,96 @@ +import { describe, it, expect, beforeAll, afterAll } from 'vitest'; +import fs from 'node:fs/promises'; +import path from 'node:path'; +import os from 'node:os'; +import AdmZip from 'adm-zip'; +import { registerArchiveConverters, assertNoPathEscape } from '../../src/converters/archive.js'; +import { resolve, listTargetFormats } from '../../src/converters/registry.js'; + +let tmpDir; +let srcFixtureDir; + +beforeAll(async () => { + registerArchiveConverters(); + tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), 'converter-archive-')); + + srcFixtureDir = path.join(tmpDir, 'src-fixture'); + await fs.mkdir(path.join(srcFixtureDir, 'nested'), { recursive: true }); + await fs.writeFile(path.join(srcFixtureDir, 'hello.txt'), 'hello world'); + await fs.writeFile(path.join(srcFixtureDir, 'nested', 'inner.txt'), 'nested content'); +}); + +afterAll(async () => { + await fs.rm(tmpDir, { recursive: true, force: true }); +}); + +function buildZipFixture(destPath) { + const zip = new AdmZip(); + zip.addFile('hello.txt', Buffer.from('hello world')); + zip.addFile('nested/inner.txt', Buffer.from('nested content')); + zip.writeZip(destPath); +} + +describe('archive converters — zip', () => { + it('registers zip -> zip (same-format pairs are allowed for this family)', () => { + expect(listTargetFormats('zip')).toContain('zip'); + }); + + it('round-trips a zip fixture through zip -> zip', async () => { + const inputPath = path.join(tmpDir, 'fixture.zip'); + buildZipFixture(inputPath); + const outputPath = path.join(tmpDir, 'output.zip'); + const entry = resolve('zip', 'zip'); + + await entry.convert(inputPath, outputPath, { quality: 9 }); + + const outZip = new AdmZip(outputPath); + const names = outZip + .getEntries() + .filter((e) => !e.isDirectory) + .map((e) => e.entryName) + .sort(); + expect(names).toEqual(['hello.txt', 'nested/inner.txt']); + expect(outZip.readAsText('hello.txt')).toBe('hello world'); + expect(outZip.readAsText('nested/inner.txt')).toBe('nested content'); + }); + + it('produces a smaller-or-equal zip at a higher compression level', async () => { + const inputPath = path.join(tmpDir, 'fixture-for-level.zip'); + const zip = new AdmZip(); + zip.addFile('big.txt', Buffer.from('ab'.repeat(100000))); + zip.writeZip(inputPath); + + const lowPath = path.join(tmpDir, 'low.zip'); + const highPath = path.join(tmpDir, 'high.zip'); + const entry = resolve('zip', 'zip'); + + await entry.convert(inputPath, lowPath, { quality: 0 }); + await entry.convert(inputPath, highPath, { quality: 9 }); + + const [lowStat, highStat] = await Promise.all([fs.stat(lowPath), fs.stat(highPath)]); + expect(highStat.size).toBeLessThanOrEqual(lowStat.size); + }); +}); + +describe('assertNoPathEscape', () => { + it('does not throw for a directory with only well-behaved entries', async () => { + await expect(assertNoPathEscape(srcFixtureDir)).resolves.toBeUndefined(); + }); +}); + +describe('archive converters — zip-slip protection', () => { + it('rejects a zip whose entry path escapes the extraction directory', async () => { + const maliciousPath = path.join(tmpDir, 'evil.zip'); + const zip = new AdmZip(); + zip.addFile('evil.txt', Buffer.from('pwned')); + // adm-zip sanitizes entryName on addFile(), stripping "../" — mutate the + // entry directly afterward to build a genuinely malicious fixture. + zip.getEntries()[0].entryName = '../evil.txt'; + zip.writeZip(maliciousPath); + + const outputPath = path.join(tmpDir, 'should-not-exist.zip'); + const entry = resolve('zip', 'zip'); + + await expect(entry.convert(maliciousPath, outputPath)).rejects.toThrow(/escapes/); + }); +});