CodeSampleX

Exemplo

@sigstore/tuf 3.1.1: DEFAULT_MIRROR_URL, TUFError, getTrustedRoot

Amostra verificada para npm @sigstore/tuf 3.1.1: DEFAULT_MIRROR_URL, TUFError, getTrustedRoot. O contrato rodou em node 22 · linux debian/x64 · docker e…

sha256:191d920df12ad5113d22447f6745d425763d741e1d0974087d905120ea74d49f

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 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

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/%40sigstore/tuf@3.1.1
Pacotes
Símbolos
  • DEFAULT_MIRROR_URL
  • TUFError
  • getTrustedRoot
  • initTUF
Ambiente
node 22.23.2
Criado
2026-10-18T02:47:12Z

Contrato

  1. DEFAULT_MIRROR_URL exports the default HTTPS Sigstore TUF repository mirror URL string
  2. new TUFError({ code, message, cause }) constructs an Error instance with name TUFError, code, message, and cause properties
  3. initTUF({ cachePath, mirrorURL, forceInit: true }) rejects with TUFError code TUF_INIT_CACHE_ERROR when no root.json seed exists for mirrorURL and rootPath is omitted
  4. initTUF({ cachePath, mirrorURL, rootPath, forceCache: true }) initializes an offline TUF client from local signed metadata and client.getTarget(targetName) returns the verified cached target contents
  5. client.getTarget(targetName) rejects with TUFError code TUF_FIND_TARGET_ERROR when the requested target is not present in signed targets metadata
  6. getTrustedRoot({ cachePath, mirrorURL, rootPath, forceCache: true }) reads trusted_root.json from the TUF cache and parses it into a TrustedRoot object

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/%40sigstore/tuf@3.1.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40sigstore/tuf@3.1.1

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:sha256:314d39e994599aab36f85b5f57024f228b2a49d7364f5ce45cdb83b1b19a3913","contract":["DEFAULT_MIRROR_URL exports the default HTTPS Sigstore TUF repository mirror URL string","new TUFError({ code, message, cause }) constructs an Error instance with name TUFError, code, message, and cause properties","initTUF({ cachePath, mirrorURL, forceInit: true }) rejects with TUFError code TUF_INIT_CACHE_ERROR when no root.json seed exists for mirrorURL and rootPath is omitted","initTUF({ cachePath, mirrorURL, rootPath, forceCache: true }) initializes an offline TUF client from local signed metadata and client.getTarget(targetName) returns the verified cached target contents","client.getTarget(targetName) rejects with TUFError code TUF_FIND_TARGET_ERROR when the requested target is not present in signed targets metadata","getTrustedRoot({ cachePath, mirrorURL, rootPath, forceCache: true }) reads trusted_root.json from the TUF cache and parses it into a TrustedRoot object"],"goal":"verify pkg:npm/%40sigstore/tuf@3.1.1","kind":"HOW","packages":["pkg:npm/%40sigstore/tuf@3.1.1"],"schemaVersion":1,"symbols":["DEFAULT_MIRROR_URL","TUFError","getTrustedRoot","initTUF"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40sigstore/tuf@3.1.1"],"schemaVersion":1,"subject":"pkg:npm/%40sigstore/tuf@3.1.1","symbols":["DEFAULT_MIRROR_URL","TUFError","getTrustedRoot","initTUF"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sigstore-tuf-sample",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@sigstore/tuf": "3.1.1"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40sigstore/tuf@3.1.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40sigstore/tuf@3.1.1"
  ]
}
src/index.mjs
import crypto from 'node:crypto';
import fs from 'node:fs';
import path from 'node:path';
import {
  DEFAULT_MIRROR_URL,
  TUFError,
  getTrustedRoot,
  initTUF,
} from '@sigstore/tuf';

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

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

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

export function createOfflineTufCache(baseDir, mirrorURL = 'http://localhost') {
  const { publicKey, privateKey } = crypto.generateKeyPairSync('ed25519');
  const rawPubHex = publicKey
    .export({ type: 'spki', format: 'der' })
    .subarray(-32)
    .toString('hex');
  const keyid = 'key-ed25519-1';
  const expires = new Date(Date.now() + 86400_000).toISOString();

  const url = new URL(mirrorURL);
  const repoName = encodeURIComponent(
    url.host + url.pathname.replace(/\/$/, '')
  );
  const repoDir = path.join(baseDir, repoName);
  const targetsDir = path.join(repoDir, 'targets');
  fs.mkdirSync(targetsDir, { recursive: true });

  const trustedRootPayload = JSON.stringify({
    mediaType: 'application/vnd.dev.sigstore.trustedroot+json;version=0.1',
    tlogs: [],
    certificateAuthorities: [],
    ctlogs: [],
    timestampAuthorities: [],
  });
  const targetBytes = Buffer.from(trustedRootPayload, 'utf8');
  fs.writeFileSync(path.join(targetsDir, 'trusted_root.json'), targetBytes);

  const rootSigned = {
    _type: 'root',
    consistent_snapshot: false,
    expires,
    keys: {
      [keyid]: {
        keytype: 'ed25519',
        keyval: { public: rawPubHex },
        scheme: 'ed25519',
      },
    },
    roles: {
      root: { keyids: [keyid], threshold: 1 },
      snapshot: { keyids: [keyid], threshold: 1 },
      targets: { keyids: [keyid], threshold: 1 },
      timestamp: { keyids: [keyid], threshold: 1 },
    },
    spec_version: '1.0.0',
    version: 1,
  };
  const rootJson = signMetadata(rootSigned, keyid, privateKey);
  const rootPath = path.join(repoDir, 'root.json');
  fs.writeFileSync(rootPath, rootJson);

  const targetsSigned = {
    _type: 'targets',
    expires,
    spec_version: '1.0.0',
    targets: {
      'trusted_root.json': {
        hashes: { sha256: sha256Hex(targetBytes) },
        length: targetBytes.length,
      },
    },
    version: 1,
  };
  const targetsJson = Buffer.from(
    signMetadata(targetsSigned, keyid, privateKey),
    'utf8'
  );
  fs.writeFileSync(path.join(repoDir, 'targets.json'), targetsJson);

  const snapshotSigned = {
    _type: 'snapshot',
    expires,
    meta: {
      'targets.json': {
        hashes: { sha256: sha256Hex(targetsJson) },
        length: targetsJson.length,
        version: 1,
      },
    },
    spec_version: '1.0.0',
    version: 1,
  };
  const snapshotJson = Buffer.from(
    signMetadata(snapshotSigned, keyid, privateKey),
    'utf8'
  );
  fs.writeFileSync(path.join(repoDir, 'snapshot.json'), snapshotJson);

  const timestampSigned = {
    _type: 'timestamp',
    expires,
    meta: {
      'snapshot.json': {
        hashes: { sha256: sha256Hex(snapshotJson) },
        length: snapshotJson.length,
        version: 1,
      },
    },
    spec_version: '1.0.0',
    version: 1,
  };
  const timestampJson = Buffer.from(
    signMetadata(timestampSigned, keyid, privateKey),
    'utf8'
  );
  fs.writeFileSync(path.join(repoDir, 'timestamp.json'), timestampJson);

  return { cachePath: baseDir, mirrorURL, rootPath };
}

export { DEFAULT_MIRROR_URL, TUFError, getTrustedRoot, initTUF };
test/contract.mjs
import assert from 'node:assert/strict';
import fs from 'node:fs';
import os from 'node:os';
import path from 'node:path';
import {
  DEFAULT_MIRROR_URL,
  TUFError,
  createOfflineTufCache,
  getTrustedRoot,
  initTUF,
} from '../src/index.mjs';

const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'tuf-contract-'));
try {
  // 1. DEFAULT_MIRROR_URL export
  assert.equal(typeof DEFAULT_MIRROR_URL, 'string');
  assert.equal(DEFAULT_MIRROR_URL.startsWith('https://'), true);

  // 2. TUFError construction and properties
  const customErr = new TUFError({
    code: 'TUF_READ_TARGET_ERROR',
    message: 'custom failure',
    cause: new Error('underlying'),
  });
  assert.equal(customErr instanceof Error, true);
  assert.equal(customErr instanceof TUFError, true);
  assert.equal(customErr.name, 'TUFError');
  assert.equal(customErr.code, 'TUF_READ_TARGET_ERROR');
  assert.equal(customErr.message, 'custom failure');

  // 3. Unseeded mirror without rootPath raises TUF_INIT_CACHE_ERROR
  const emptyCacheDir = path.join(tmpDir, 'empty');
  await assert.rejects(
    () =>
      initTUF({
        cachePath: emptyCacheDir,
        mirrorURL: 'http://localhost:9999',
        forceInit: true,
      }),
    (err) =>
      err instanceof TUFError && err.code === 'TUF_INIT_CACHE_ERROR'
  );

  // 4. Offline cached repository: initTUF + client.getTarget + getTrustedRoot
  const seededDir = path.join(tmpDir, 'seeded');
  const { cachePath, mirrorURL, rootPath } = createOfflineTufCache(
    seededDir,
    'http://localhost'
  );

  const client = await initTUF({
    cachePath,
    mirrorURL,
    rootPath,
    forceCache: true,
    forceInit: false,
  });

  const rawTarget = await client.getTarget('trusted_root.json');
  const parsedTarget = JSON.parse(rawTarget);
  assert.equal(
    parsedTarget.mediaType,
    'application/vnd.dev.sigstore.trustedroot+json;version=0.1'
  );

  // Missing target raises TUF_FIND_TARGET_ERROR
  await assert.rejects(
    () => client.getTarget('nonexistent.json'),
    (err) =>
      err instanceof TUFError && err.code === 'TUF_FIND_TARGET_ERROR'
  );

  // getTrustedRoot parses TrustedRoot protobuf-specs structure from TUF target
  const trustedRoot = await getTrustedRoot({
    cachePath,
    mirrorURL,
    rootPath,
    forceCache: true,
    forceInit: false,
  });
  assert.equal(
    trustedRoot.mediaType,
    'application/vnd.dev.sigstore.trustedroot+json;version=0.1'
  );
  assert.deepEqual(trustedRoot.tlogs, []);
  assert.deepEqual(trustedRoot.certificateAuthorities, []);
} finally {
  fs.rmSync(tmpDir, { recursive: true, force: true });
}

Seeder de origem

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