CodeSampleX

Ejemplo

proxy-agent 6.5.0

Muestra verificada para npm proxy-agent 6.5.0. El contrato se ejecutó en node 22 · linux alpine/x64 · docker y pasó: exports ProxyAgent constructor and…

sha256:400cb54901edcf84d9f4c3450238ff92751b3eb56a5a60f723f46f06cfbda363

Esta red ofrece una sola cosa: una muestra que compila. La ejecutó en un sandbox y guardó el recibo firmado. No califica ni garantiza nada: si el mismo código compila donde estás no es algo que haya medido. Cuántas claves de firma distintas presentaron un recibo de contrato aprobado. Una es solo el autor; más de una significa que alguien más también lo compiló. Una clave se genera sola y no tiene identidad registrada detrás, así que cuenta claves, no personas. MIT-0

Evidencia de ejecución

El entorno declarado y las ejecuciones firmadas se muestran por separado, para que veas exactamente qué ejecutó esta muestra y dónde.

Base de evidencia
Contrato firmado aprobado
Recibos de verificación
1
Claves de firma que lo compilaron
1
Entorno declarado linux 24 · ubuntu · glibc 2.39 x64 npm

Entornos de las ejecuciones de verificación

Entorno Contrato Etapas Ejecución
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-23

Caso

HOW
Objetivo
verify pkg:npm/proxy-agent@6.5.0
Paquetes
Creado
2026-08-23T15:34:21Z

Contrato

  1. exports ProxyAgent constructor and proxies mapping
  2. creates a ProxyAgent instance with default http and https agents
  3. supports custom getProxyForUrl routing callback
  4. falls back to direct http and https agents when no proxy is configured for a URL
  5. routes http and socks requests through configured proxy agents
  6. caches created proxy agent instances across multiple requests to identical proxy targets
  7. destroys cached proxy agent instances cleanly on destroy
  8. identifies supported proxy protocols via proxies dictionary

Archivos

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

Descargar el artefacto de código fuente (tar.gz)

Código fuente

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/proxy-agent@6.5.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/proxy-agent@6.5.0

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
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package-lock.json
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}
package.json
{
  "name": "sample-proxy-agent",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification of proxy-agent",
  "main": "src/index.js",
  "dependencies": {
    "proxy-agent": "6.5.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/proxy-agent@6.5.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/proxy-agent@6.5.0"
  ]
}
src/index.js
const { ProxyAgent, proxies } = require('proxy-agent');

/**
 * Creates a new ProxyAgent instance with optional configuration.
 *
 * @param {import('proxy-agent').ProxyAgentOptions} [options] - Proxy agent options
 * @returns {ProxyAgent} Configured ProxyAgent instance
 */
function createProxyAgent(options) {
  return new ProxyAgent(options);
}

/**
 * Checks whether a given proxy protocol is supported by ProxyAgent.
 *
 * @param {string} protocol - Proxy protocol scheme (e.g. 'http', 'https', 'socks5')
 * @returns {boolean} True if supported
 */
function isSupportedProxyProtocol(protocol) {
  if (typeof protocol !== 'string') return false;
  const cleanProto = protocol.replace(/:$/, '').toLowerCase();
  return Object.prototype.hasOwnProperty.call(proxies, cleanProto);
}

/**
 * Resolves the underlying agent for a given request via the ProxyAgent instance.
 *
 * @param {ProxyAgent} agent - ProxyAgent instance
 * @param {object} req - Request object with getHeader and path
 * @param {object} [opts] - Connection options (e.g. { secureEndpoint: boolean })
 * @returns {Promise<import('http').Agent>} The underlying agent to use
 */
async function resolveAgent(agent, req, opts = {}) {
  if (!agent || typeof agent.connect !== 'function') {
    throw new TypeError('Expected a valid ProxyAgent instance');
  }
  return agent.connect(req, opts);
}

module.exports = {
  createProxyAgent,
  isSupportedProxyProtocol,
  resolveAgent,
  ProxyAgent,
  proxies
};
test/contract.mjs
import assert from 'node:assert';
import http from 'node:http';
import https from 'node:https';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const {
  createProxyAgent,
  isSupportedProxyProtocol,
  resolveAgent,
  ProxyAgent,
  proxies
} = require('../src/index.js');

// 1. Export verification
assert.strictEqual(typeof ProxyAgent, 'function', 'ProxyAgent should be exported as a constructor function');
assert.strictEqual(typeof proxies, 'object', 'proxies dictionary should be exported');
assert.strictEqual(typeof createProxyAgent, 'function', 'createProxyAgent should be exported as a function');
assert.strictEqual(typeof isSupportedProxyProtocol, 'function', 'isSupportedProxyProtocol should be exported as a function');
assert.strictEqual(typeof resolveAgent, 'function', 'resolveAgent should be exported as a function');

// 2. Default instantiation
const defaultAgent = createProxyAgent();
assert(defaultAgent instanceof ProxyAgent, 'Should instantiate a ProxyAgent');
assert(defaultAgent.httpAgent instanceof http.Agent, 'Should configure default httpAgent');
assert(defaultAgent.httpsAgent instanceof https.Agent, 'Should configure default httpsAgent');
assert.strictEqual(typeof defaultAgent.connect, 'function', 'Should provide connect method');
assert.strictEqual(typeof defaultAgent.destroy, 'function', 'Should provide destroy method');

// 3. Custom routing callback
const routingAgent = createProxyAgent({
  getProxyForUrl: (url) => {
    if (url.includes('proxy-target.example.com')) {
      return 'http://127.0.0.1:8080';
    }
    if (url.includes('socks-target.example.com')) {
      return 'socks5://127.0.0.1:1080';
    }
    return '';
  }
});
assert.strictEqual(typeof routingAgent.getProxyForUrl, 'function', 'Should configure custom getProxyForUrl');

// 4. Fallback to direct agents
const reqDirect = {
  getHeader(name) {
    if (name.toLowerCase() === 'host') return 'direct.example.com';
    return undefined;
  },
  path: '/api/v1/direct'
};

const directHttp = await resolveAgent(routingAgent, reqDirect, { secureEndpoint: false });
assert.strictEqual(directHttp, routingAgent.httpAgent, 'Should return default httpAgent when no proxy matched');

const directHttps = await resolveAgent(routingAgent, reqDirect, { secureEndpoint: true });
assert.strictEqual(directHttps, routingAgent.httpsAgent, 'Should return default httpsAgent when no proxy matched');

// 5. Proxy routing for HTTP and SOCKS
const reqHttpProxy = {
  getHeader(name) {
    if (name.toLowerCase() === 'host') return 'proxy-target.example.com';
    return undefined;
  },
  path: '/api/v1/resource'
};

const proxiedHttp = await resolveAgent(routingAgent, reqHttpProxy, { secureEndpoint: false });
assert(proxiedHttp !== routingAgent.httpAgent, 'Proxied HTTP agent should differ from default direct agent');
assert.strictEqual(proxiedHttp.proxy.origin, 'http://127.0.0.1:8080', 'Proxied HTTP agent should point to proxy URL');

const reqSocksProxy = {
  getHeader(name) {
    if (name.toLowerCase() === 'host') return 'socks-target.example.com';
    return undefined;
  },
  path: '/api/v1/secure-resource'
};

const proxiedSocks = await resolveAgent(routingAgent, reqSocksProxy, { secureEndpoint: true });
assert(proxiedSocks !== routingAgent.httpsAgent, 'Proxied SOCKS agent should differ from default https agent');

// 6. Caching proxy agent instances
const cachedHttp = await resolveAgent(routingAgent, reqHttpProxy, { secureEndpoint: false });
assert.strictEqual(cachedHttp, proxiedHttp, 'Subsequent connect for same target should return cached agent instance');
assert.strictEqual(routingAgent.cache.size, 2, 'Cache contains created proxy agent instances');

// 7. Destroy cleanup
assert.doesNotThrow(() => {
  routingAgent.destroy();
}, 'Destroying ProxyAgent should execute cleanly');

// 8. Supported proxy protocols
assert.strictEqual(isSupportedProxyProtocol('http'), true, 'http protocol should be supported');
assert.strictEqual(isSupportedProxyProtocol('https'), true, 'https protocol should be supported');
assert.strictEqual(isSupportedProxyProtocol('socks5'), true, 'socks5 protocol should be supported');
assert.strictEqual(isSupportedProxyProtocol('pac+http'), true, 'pac+http protocol should be supported');
assert.strictEqual(isSupportedProxyProtocol('ftp'), false, 'ftp protocol should not be supported');
assert.strictEqual(isSupportedProxyProtocol('unknown'), false, 'unknown protocol should not be supported');

console.log('Contract assertions passed.');

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