CodeSampleX

Exemplo

tuf-js 3.1.0: Updater, BaseFetcher, TargetFile

Amostra verificada para npm tuf-js 3.1.0: Updater, BaseFetcher, TargetFile. O contrato rodou em node 22 · linux debian/x64 · docker e passou.

sha256:b726d90ddcea0f06da533090c5fef7dab62afa92fe6d85ba86cf55be3ccf3e60

Esta rede oferece uma coisa: uma amostra que compila. Ela a executou em um sandbox e guardou o recibo assinado. Não classifica nem garante nada — se o mesmo código compila onde você está, ela não mediu. Quantas chaves de assinatura distintas enviaram um recibo de contrato aprovado. Uma é só o autor; mais de uma significa que outra pessoa também o compilou. Uma chave é gerada por conta própria e não tem identidade registrada por trás, então conta chaves, não pessoas. MIT-0

Evidência de execução

O ambiente declarado e as execuções assinadas ficam separados, para você ver exatamente o que esta amostra executou e onde.

Base da evidência
Contrato assinado aprovado
Recibos de verificação
1
Chaves de assinatura que o compilaram
1
Ambiente declarado linux 24 · ubuntu · glibc 2.39 x64 npm

Ambientes das execuções de verificação

Ambiente Contrato Etapas Execução
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-10-18

Caso

HOW
Objetivo
verify pkg:npm/tuf-js@3.1.0
Pacotes
Símbolos
  • Updater
  • BaseFetcher
  • TargetFile
Criado
2026-10-18T03:53:56Z

Contrato

  1. new Updater({ metadataDir, metadataBaseUrl, targetDir, targetBaseUrl, fetcher, forceCache: true }) loads root.json from metadataDir and verifies its self-signature
  2. await updater.refresh() loads and verifies timestamp.json, snapshot.json, and targets.json against the trusted root and role signatures
  3. await updater.getTargetInfo(targetPath) returns a TargetFile instance with matching path, length, hashes, and custom metadata, or undefined when the target path is not in targets metadata
  4. await updater.downloadTarget(targetInfo) downloads the target via the configured BaseFetcher subclass, verifies length and sha256 hash via TargetFile.verify(), and writes the verified file to targetDir
  5. await updater.findCachedTarget(targetInfo) returns undefined before download and returns the cached file path once verified on disk
  6. new TargetFile({ path, length, hashes, unrecognizedFields }).verify(stream) resolves when stream length and sha256 match and rejects with LengthOrHashMismatchError when tampered
  7. BaseFetcher.downloadBytes(url, maxLength) resolves with a Buffer within maxLength and rejects with DownloadLengthMismatchError when the stream exceeds maxLength

Arquivos

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.mjs
  • test/contract.mjs

Baixar o artefato de código-fonte (tar.gz)

Código-fonte

PROMPT.md
Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:npm/tuf-js@3.1.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/tuf-js@3.1.0

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.
csx.json
{"case":{"caseId":"case:sha256:bc8d7c9ec977cd6db7752c520b39f46b7d1916db16ff4c774008a48300c8e9d6","contract":["new Updater({ metadataDir, metadataBaseUrl, targetDir, targetBaseUrl, fetcher, forceCache: true }) loads root.json from metadataDir and verifies its self-signature","await updater.refresh() loads and verifies timestamp.json, snapshot.json, and targets.json against the trusted root and role signatures","await updater.getTargetInfo(targetPath) returns a TargetFile instance with matching path, length, hashes, and custom metadata, or undefined when the target path is not in targets metadata","await updater.downloadTarget(targetInfo) downloads the target via the configured BaseFetcher subclass, verifies length and sha256 hash via TargetFile.verify(), and writes the verified file to targetDir","await updater.findCachedTarget(targetInfo) returns undefined before download and returns the cached file path once verified on disk","new TargetFile({ path, length, hashes, unrecognizedFields }).verify(stream) resolves when stream length and sha256 match and rejects with LengthOrHashMismatchError when tampered","BaseFetcher.downloadBytes(url, maxLength) resolves with a Buffer within maxLength and rejects with DownloadLengthMismatchError when the stream exceeds maxLength"],"goal":"verify pkg:npm/tuf-js@3.1.0","kind":"HOW","packages":["pkg:npm/tuf-js@3.1.0"],"schemaVersion":1,"symbols":["Updater","BaseFetcher","TargetFile"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/tuf-js@3.1.0"],"schemaVersion":1,"subject":"pkg:npm/tuf-js@3.1.0","symbols":["Updater","BaseFetcher","TargetFile"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "tuf-js-sample",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "tuf-js": "3.1.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/tuf-js@3.1.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/tuf-js@3.1.0"
  ]
}
src/index.mjs
import crypto from 'node:crypto';
import fs from 'node:fs';
import os from 'node:os';
import path from 'node:path';
import { Readable } from 'node:stream';
import { BaseFetcher, TargetFile, Updater } from 'tuf-js';

function canonicalize(val) {
  if (val === null || typeof val !== 'object') {
    return JSON.stringify(val);
  }
  if (Array.isArray(val)) {
    return '[' + val.map((item) => canonicalize(item)).join(',') + ']';
  }
  const keys = Object.keys(val)
    .filter((k) => val[k] !== undefined)
    .sort();
  return (
    '{' +
    keys
      .map((k) => JSON.stringify(k) + ':' + canonicalize(val[k]))
      .join(',') +
    '}'
  );
}

function signMetadata(signed, keyId, privateKey) {
  const canonical = Buffer.from(canonicalize(signed), 'utf8');
  const sig = crypto.sign(undefined, canonical, privateKey).toString('hex');
  return {
    signatures: [{ keyid: keyId, sig }],
    signed,
  };
}

function sha256Hex(buf) {
  return crypto.createHash('sha256').update(buf).digest('hex');
}

export class InMemoryTufFetcher extends BaseFetcher {
  constructor(routes) {
    super();
    this.routes = routes;
  }

  async fetch(url) {
    if (!Object.prototype.hasOwnProperty.call(this.routes, url)) {
      const err = new Error(`Not Found: ${url}`);
      err.statusCode = 404;
      throw err;
    }
    const content = this.routes[url];
    const buf = Buffer.isBuffer(content) ? content : Buffer.from(content, 'utf8');
    return Readable.from([buf]);
  }
}

export function buildSignedRepository({
  expires = '2099-01-01T00:00:00Z',
  consistentSnapshot = true,
  targets = {},
} = {}) {
  const { publicKey, privateKey } = crypto.generateKeyPairSync('ed25519');
  const pubDer = publicKey.export({ type: 'spki', format: 'der' });
  const rawPubHex = pubDer.subarray(pubDer.length - 32).toString('hex');
  const keyId = sha256Hex(Buffer.from(rawPubHex, 'utf8'));

  const keyObj = {
    keytype: 'ed25519',
    scheme: 'ed25519',
    keyval: { public: rawPubHex },
  };

  const roleDef = { keyids: [keyId], threshold: 1 };
  const rootSigned = {
    _type: 'root',
    spec_version: '1.0.31',
    version: 1,
    expires,
    consistent_snapshot: consistentSnapshot,
    keys: { [keyId]: keyObj },
    roles: {
      root: roleDef,
      targets: roleDef,
      snapshot: roleDef,
      timestamp: roleDef,
    },
  };
  const rootBytes = Buffer.from(
    JSON.stringify(signMetadata(rootSigned, keyId, privateKey)),
    'utf8'
  );

  const targetEntries = {};
  const targetBuffers = {};
  for (const [targetPath, content] of Object.entries(targets)) {
    const buf = Buffer.isBuffer(content) ? content : Buffer.from(content, 'utf8');
    const hash = sha256Hex(buf);
    targetEntries[targetPath] = {
      length: buf.length,
      hashes: { sha256: hash },
      custom: { tag: 'v1' },
    };
    targetBuffers[targetPath] = { buf, hash };
  }

  const targetsSigned = {
    _type: 'targets',
    spec_version: '1.0.31',
    version: 1,
    expires,
    targets: targetEntries,
  };
  const targetsBytes = Buffer.from(
    JSON.stringify(signMetadata(targetsSigned, keyId, privateKey)),
    'utf8'
  );

  const snapshotSigned = {
    _type: 'snapshot',
    spec_version: '1.0.31',
    version: 1,
    expires,
    meta: {
      'targets.json': {
        version: 1,
        length: targetsBytes.length,
        hashes: { sha256: sha256Hex(targetsBytes) },
      },
    },
  };
  const snapshotBytes = Buffer.from(
    JSON.stringify(signMetadata(snapshotSigned, keyId, privateKey)),
    'utf8'
  );

  const timestampSigned = {
    _type: 'timestamp',
    spec_version: '1.0.31',
    version: 1,
    expires,
    meta: {
      'snapshot.json': {
        version: 1,
        length: snapshotBytes.length,
        hashes: { sha256: sha256Hex(snapshotBytes) },
      },
    },
  };
  const timestampBytes = Buffer.from(
    JSON.stringify(signMetadata(timestampSigned, keyId, privateKey)),
    'utf8'
  );

  return {
    rootBytes,
    targetsBytes,
    snapshotBytes,
    timestampBytes,
    targetBuffers,
  };
}

export function createOfflineUpdater({
  metadataBaseUrl = 'https://example.com/metadata',
  targetBaseUrl = 'https://example.com/targets',
  targets = { 'app/release.txt': 'verified-payload-v1' },
  config = {},
} = {}) {
  const workDir = fs.mkdtempSync(path.join(os.tmpdir(), 'tuf-sample-'));
  const metadataDir = path.join(workDir, 'metadata');
  const targetDir = path.join(workDir, 'targets');
  fs.mkdirSync(metadataDir, { recursive: true });
  fs.mkdirSync(targetDir, { recursive: true });

  const repo = buildSignedRepository({
    consistentSnapshot: true,
    targets,
  });

  // Pre-seed local metadata directory with 1.root.json (as root.json), timestamp, snapshot, and targets
  fs.writeFileSync(path.join(metadataDir, 'root.json'), repo.rootBytes);
  fs.writeFileSync(path.join(metadataDir, 'timestamp.json'), repo.timestampBytes);
  fs.writeFileSync(path.join(metadataDir, 'snapshot.json'), repo.snapshotBytes);
  fs.writeFileSync(path.join(metadataDir, 'targets.json'), repo.targetsBytes);

  const routes = {
    [`${metadataBaseUrl}/timestamp.json`]: repo.timestampBytes,
    [`${metadataBaseUrl}/1.snapshot.json`]: repo.snapshotBytes,
    [`${metadataBaseUrl}/snapshot.json`]: repo.snapshotBytes,
    [`${metadataBaseUrl}/1.targets.json`]: repo.targetsBytes,
    [`${metadataBaseUrl}/targets.json`]: repo.targetsBytes,
  };

  for (const [targetPath, { buf, hash }] of Object.entries(repo.targetBuffers)) {
    const parsed = path.posix.parse(targetPath);
    const hashedName = parsed.dir
      ? `${parsed.dir}/${hash}.${parsed.base}`
      : `${hash}.${parsed.base}`;
    routes[`${targetBaseUrl}/${hashedName}`] = buf;
    routes[`${targetBaseUrl}/${targetPath}`] = buf;
  }

  const fetcher = new InMemoryTufFetcher(routes);
  const updater = new Updater({
    metadataDir,
    metadataBaseUrl,
    targetDir,
    targetBaseUrl,
    fetcher,
    forceCache: true,
    config,
  });

  return {
    updater,
    fetcher,
    workDir,
    metadataDir,
    targetDir,
    TargetFile,
    cleanup() {
      fs.rmSync(workDir, { recursive: true, force: true });
    },
  };
}
test/contract.mjs
import assert from 'node:assert/strict';
import crypto from 'node:crypto';
import fs from 'node:fs';
import { Readable } from 'node:stream';
import { BaseFetcher, TargetFile, Updater } from 'tuf-js';
import { createOfflineUpdater, InMemoryTufFetcher } from '../src/index.mjs';

const ctx = createOfflineUpdater({
  targets: {
    'app/release.txt': 'verified-payload-v1',
  },
});

try {
  // 1. Verify Updater and BaseFetcher classes
  assert.ok(ctx.updater instanceof Updater, 'updater should be an instance of Updater');
  assert.ok(ctx.fetcher instanceof BaseFetcher, 'fetcher should subclass BaseFetcher');

  // 2. Refresh metadata and look up target info
  await ctx.updater.refresh();
  const targetInfo = await ctx.updater.getTargetInfo('app/release.txt');
  assert.ok(targetInfo instanceof TargetFile, 'getTargetInfo should return a TargetFile instance');
  assert.equal(targetInfo.path, 'app/release.txt');
  assert.equal(targetInfo.length, Buffer.byteLength('verified-payload-v1'));
  assert.deepEqual(targetInfo.custom, { tag: 'v1' });

  const missingInfo = await ctx.updater.getTargetInfo('app/nonexistent.txt');
  assert.equal(missingInfo, undefined, 'getTargetInfo should return undefined for unknown target');

  // 3. Before download, findCachedTarget should return undefined
  const cachedBefore = await ctx.updater.findCachedTarget(targetInfo);
  assert.equal(cachedBefore, undefined, 'findCachedTarget should be undefined before download');

  // 4. Download target via custom BaseFetcher and verify file contents
  const downloadedPath = await ctx.updater.downloadTarget(targetInfo);
  assert.equal(fs.readFileSync(downloadedPath, 'utf8'), 'verified-payload-v1');

  // 5. After download, findCachedTarget should locate and hash-verify the cached file
  const cachedAfter = await ctx.updater.findCachedTarget(targetInfo);
  assert.equal(cachedAfter, downloadedPath, 'findCachedTarget should return downloaded file path');

  // 6. Direct TargetFile construction, equality, and stream verification
  const payload = Buffer.from('standalone-target-check', 'utf8');
  const sha256 = crypto.createHash('sha256').update(payload).digest('hex');
  const standaloneTarget = new TargetFile({
    path: 'standalone.bin',
    length: payload.length,
    hashes: { sha256 },
    unrecognizedFields: { custom: { channel: 'stable' } },
  });
  assert.deepEqual(standaloneTarget.custom, { channel: 'stable' });
  await standaloneTarget.verify(Readable.from([payload]));

  await assert.rejects(
    () => standaloneTarget.verify(Readable.from([Buffer.from('tampered', 'utf8')])),
    /Expected length/
  );

  // 7. BaseFetcher downloadBytes length enforcement
  const smallFetcher = new InMemoryTufFetcher({
    'https://example.com/item': Buffer.from('0123456789', 'utf8'),
  });
  const bytes = await smallFetcher.downloadBytes('https://example.com/item', 10);
  assert.equal(bytes.toString('utf8'), '0123456789');

  await assert.rejects(
    () => smallFetcher.downloadBytes('https://example.com/item', 5),
    /Max length reached/
  );
} finally {
  ctx.cleanup();
}

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