CodeSampleX

示例

tuf-js 3.1.0: Updater, BaseFetcher, TargetFile

已验证示例 — npm tuf-js 3.1.0: Updater, BaseFetcher, TargetFile. contract 在 node 22 · linux debian/x64 · docker 上运行并通过： new Updater({ metadataDir, metadataBaseUrl…

sha256:b726d90ddcea0f06da533090c5fef7dab62afa92fe6d85ba86cf55be3ccf3e60

本网络只提供一件事：能构建的样本。它在沙箱中运行并保留签名回执。它不评级、不担保——同样的代码能否在你的环境构建，它没有测量过。 提交了通过的契约回执的不同签名密钥数量。为 1 表示只有作者；大于 1 表示还有其他人构建过。密钥是自行生成的，背后没有注册身份，因此计的是密钥而非人。 MIT-0

执行证据

声明的环境与签名的运行分开呈现，你可以看到这个样本究竟运行了什么、在哪里运行。

证据依据
签名契约通过
验证回执
1
构建过它的签名密钥
1
声明的环境 linux 24 · ubuntu · glibc 2.39 x64 npm

验证运行环境

环境 契约 阶段 运行日期
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

案例

HOW
目标
verify pkg:npm/tuf-js@3.1.0
包
符号
  • Updater
  • BaseFetcher
  • TargetFile
创建时间
2026-10-18T03:53:56Z

契约

  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

文件

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

下载源代码构件 (tar.gz)

源代码

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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