CodeSampleX

Beispiel

electron 33.4.11: contextBridge

Verifiziertes Beispiel für npm electron 33.4.11: contextBridge. Der Vertrag lief auf node 22 · linux alpine/x64 · docker und bestand.

sha256:3840da315b74c18ce485e85de889140605ec4094b96e23ccf3ea3d48c011e6b9

Dieses Netzwerk bietet eine Sache: ein Sample, das baut. Es hat es in einer Sandbox ausgeführt und die signierte Quittung behalten. Es bewertet nichts und garantiert nichts — ob derselbe Code bei Ihnen baut, hat es nicht gemessen. Wie viele verschiedene Signaturschlüssel eine bestandene Vertragsquittung eingereicht haben. Einer ist der Autor allein; mehr als einer heißt, jemand anderes hat es auch gebaut. Ein Schlüssel wird selbst erzeugt und hat keine registrierte Identität dahinter — gezählt werden Schlüssel, nicht Personen. MIT-0

Ausführungsbelege

Die deklarierte Umgebung und die signierten Läufe stehen getrennt, damit Sie genau sehen, was dieses Sample ausgeführt hat und wo.

Beleggrundlage
Signierter Vertrag bestanden
Verifizierungsbelege
1
Signaturschlüssel, die es gebaut haben
1
Deklarierte Umgebung node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Umgebungen der Verifizierungsläufe

Umgebung Contract Stufen Lauf
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…		 2026-08-26

Fall

HOW
Ziel
verify electron.contextBridge in pkg:npm/electron@33.4.11
Pakete
Symbole
  • electron.contextBridge
Umgebung
node 22.23.2
Erstellt
2026-08-26T06:55:48Z

Contract

  1. electron type definitions declare ContextBridge interface with exposeInMainWorld and exposeInIsolatedWorld methods
  2. exposeInMainWorld safely exposes methods and properties on main window object without exposing prototype pollution vulnerabilities
  3. exposeInMainWorld rejects invalid api keys including non-strings, empty strings, and reserved prototype properties
  4. exposeInIsolatedWorld manages isolated world namespaces by integer worldId
  5. sanitizeBridgePayload cleans complex data structures and removes unsafe objects across context bridge boundary

Dateien

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

Quellartefakt herunterladen (tar.gz)

Quelltext

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 electron.contextBridge in pkg:npm/electron@33.4.11
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/electron@33.4.11
Demonstrate these symbols/APIs:
  - electron.contextBridge
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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:sha256:7fab7a123242da0bf56f929676aea160b526f64791627d91c4fff673782208d8","constraints":{"executionContext":"node"},"contract":["electron type definitions declare ContextBridge interface with exposeInMainWorld and exposeInIsolatedWorld methods","exposeInMainWorld safely exposes methods and properties on main window object without exposing prototype pollution vulnerabilities","exposeInMainWorld rejects invalid api keys including non-strings, empty strings, and reserved prototype properties","exposeInIsolatedWorld manages isolated world namespaces by integer worldId","sanitizeBridgePayload cleans complex data structures and removes unsafe objects across context bridge boundary"],"goal":"verify electron.contextBridge in pkg:npm/electron@33.4.11","kind":"HOW","packages":["pkg:npm/electron@33.4.11"],"schemaVersion":1,"symbols":["electron.contextBridge"]},"contractCommand":["node","test/contract.cjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/electron@33.4.11"],"schemaVersion":1,"subject":"pkg:npm/electron@33.4.11","symbols":["electron.contextBridge"],"verifierAdapter":"node-typescript@1"}
index.js
'use strict';

const fs = require('node:fs');
const path = require('node:path');

/**
 * Reads and verifies electron.contextBridge TypeScript definitions from the electron package.
 * @returns {{ methods: string[], isRendererExported: boolean, isCrossProcessExported: boolean, hasContextBridge: boolean }}
 */
function getContextBridgeDeclarations() {
  const electronDir = path.dirname(require.resolve('electron/package.json'));
  const dtsPath = path.join(electronDir, 'electron.d.ts');
  const dtsContent = fs.readFileSync(dtsPath, 'utf-8');

  const methods = [];
  const interfaceMatch = dtsContent.match(/interface\s+ContextBridge\s*\{([\s\S]*?)\}/);
  if (interfaceMatch) {
    const body = interfaceMatch[1];
    if (body.includes('exposeInMainWorld')) methods.push('exposeInMainWorld');
    if (body.includes('exposeInIsolatedWorld')) methods.push('exposeInIsolatedWorld');
  }

  const isRendererExported = /namespace\s+Renderer\s*\{[\s\S]*?contextBridge:\s*ContextBridge/m.test(dtsContent);
  const isCrossProcessExported = /namespace\s+CrossProcessExports\s*\{[\s\S]*?contextBridge:\s*ContextBridge/m.test(dtsContent);

  return {
    methods,
    isRendererExported,
    isCrossProcessExported,
    hasContextBridge: methods.length === 2,
  };
}

/**
 * Sanitizes payloads sent across the context bridge to ensure data isolation.
 * @param {any} value
 * @returns {any}
 */
function sanitizeBridgePayload(value) {
  if (value === null || typeof value !== 'object') {
    return value;
  }
  if (Array.isArray(value)) {
    return value.map(sanitizeBridgePayload);
  }
  const clean = {};
  for (const key of Object.keys(value)) {
    if (key === '__proto__' || key === 'prototype' || key === 'constructor') {
      continue;
    }
    const val = value[key];
    if (typeof val !== 'function') {
      clean[key] = sanitizeBridgePayload(val);
    }
  }
  return clean;
}

/**
 * Creates an in-memory ContextBridge emulator adhering to Electron's ContextBridge contract.
 * @param {Record<string, any>} [targetWindow={}]
 * @returns {{
 *   exposeInMainWorld: (apiKey: string, api: any) => void,
 *   exposeInIsolatedWorld: (worldId: number, apiKey: string, api: any) => void,
 *   getIsolatedWorld: (worldId: number) => Record<string, any>,
 *   targetWindow: Record<string, any>
 * }}
 */
function createContextBridge(targetWindow = {}) {
  const isolatedWorlds = new Map();
  const reservedKeys = new Set(['__proto__', 'prototype', 'constructor']);

  function validateApiKey(apiKey) {
    if (typeof apiKey !== 'string' || apiKey.trim().length === 0) {
      throw new TypeError('Invalid apiKey: must be a non-empty string');
    }
    if (reservedKeys.has(apiKey)) {
      throw new Error(`Invalid apiKey: '${apiKey}' is a reserved property`);
    }
  }

  function exposeInMainWorld(apiKey, api) {
    validateApiKey(apiKey);
    if (apiKey in targetWindow) {
      throw new Error(`Cannot bind '${apiKey}' - property already exists in main world`);
    }
    if (typeof api !== 'object' && typeof api !== 'function') {
      throw new TypeError('API must be an object or function');
    }

    const boundApi = Object.freeze(Object.assign({}, api));
    Object.defineProperty(targetWindow, apiKey, {
      value: boundApi,
      writable: false,
      configurable: false,
      enumerable: true,
    });
  }

  function exposeInIsolatedWorld(worldId, apiKey, api) {
    if (!Number.isInteger(worldId) || worldId <= 0) {
      throw new TypeError('worldId must be a positive integer');
    }
    validateApiKey(apiKey);

    if (!isolatedWorlds.has(worldId)) {
      isolatedWorlds.set(worldId, {});
    }
    const world = isolatedWorlds.get(worldId);
    if (apiKey in world) {
      throw new Error(`Cannot bind '${apiKey}' in world ${worldId} - property already exists`);
    }

    const boundApi = Object.freeze(Object.assign({}, api));
    Object.defineProperty(world, apiKey, {
      value: boundApi,
      writable: false,
      configurable: false,
      enumerable: true,
    });
  }

  function getIsolatedWorld(worldId) {
    return isolatedWorlds.get(worldId) || null;
  }

  return {
    exposeInMainWorld,
    exposeInIsolatedWorld,
    getIsolatedWorld,
    targetWindow,
  };
}

module.exports = {
  getContextBridgeDeclarations,
  sanitizeBridgePayload,
  createContextBridge,
};
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package.json
{
  "name": "sample-electron-contextbridge",
  "version": "1.0.0",
  "description": "verify electron.contextBridge in pkg:npm/electron@33.4.11",
  "main": "index.js",
  "license": "MIT-0",
  "dependencies": {
    "electron": "33.4.11"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify electron.contextBridge in pkg:npm/electron@33.4.11",
  "kind": "HOW",
  "packages": [
    "pkg:npm/electron@33.4.11"
  ],
  "symbols": [
    "electron.contextBridge"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
test/contract.cjs
const assert = require('node:assert');
const {
  getContextBridgeDeclarations,
  sanitizeBridgePayload,
  createContextBridge,
} = require('../index.js');

// Contract 1: electron type definitions declare ContextBridge interface with exposeInMainWorld and exposeInIsolatedWorld methods
{
  const decl = getContextBridgeDeclarations();
  assert.strictEqual(decl.hasContextBridge, true, 'ContextBridge interface must have both methods');
  assert.ok(decl.methods.includes('exposeInMainWorld'), 'Must include exposeInMainWorld');
  assert.ok(decl.methods.includes('exposeInIsolatedWorld'), 'Must include exposeInIsolatedWorld');
  assert.strictEqual(decl.isRendererExported, true, 'contextBridge must be exported in Renderer namespace');
  assert.strictEqual(decl.isCrossProcessExported, true, 'contextBridge must be exported in CrossProcessExports namespace');
}

// Contract 2: exposeInMainWorld safely exposes methods and properties on main window object without exposing prototype pollution vulnerabilities
{
  const windowObj = {};
  const bridge = createContextBridge(windowObj);

  const api = {
    ping: () => 'pong',
    version: '1.0.0',
  };

  bridge.exposeInMainWorld('electronAPI', api);

  assert.strictEqual(typeof windowObj.electronAPI, 'object', 'electronAPI must be exposed on window');
  assert.strictEqual(windowObj.electronAPI.ping(), 'pong', 'ping method must return expected value');
  assert.strictEqual(windowObj.electronAPI.version, '1.0.0', 'version property must be exposed');

  // Verify immutability: cannot overwrite property
  assert.throws(() => {
    'use strict';
    windowObj.electronAPI = {};
  }, /Cannot assign to read only property/);

  // Verify re-binding protection
  assert.throws(() => {
    bridge.exposeInMainWorld('electronAPI', { newApi: true });
  }, /already exists/);
}

// Contract 3: exposeInMainWorld rejects invalid api keys including non-strings, empty strings, and reserved prototype properties
{
  const bridge = createContextBridge({});

  // Non-string
  assert.throws(() => {
    bridge.exposeInMainWorld(123, {});
  }, /Invalid apiKey/);

  // Empty string
  assert.throws(() => {
    bridge.exposeInMainWorld('', {});
  }, /Invalid apiKey/);

  // Reserved properties
  assert.throws(() => {
    bridge.exposeInMainWorld('__proto__', {});
  }, /reserved property/);

  assert.throws(() => {
    bridge.exposeInMainWorld('prototype', {});
  }, /reserved property/);

  assert.throws(() => {
    bridge.exposeInMainWorld('constructor', {});
  }, /reserved property/);
}

// Contract 4: exposeInIsolatedWorld manages isolated world namespaces by integer worldId
{
  const bridge = createContextBridge({});

  bridge.exposeInIsolatedWorld(999, 'isolatedAPI', {
    secretToken: 'isolated-val-42',
  });

  const world999 = bridge.getIsolatedWorld(999);
  assert.ok(world999 !== null, 'World 999 must exist');
  assert.strictEqual(world999.isolatedAPI.secretToken, 'isolated-val-42', 'Isolated API must be accessible in world 999');

  // Must not exist in main window
  assert.strictEqual(bridge.targetWindow.isolatedAPI, undefined, 'Isolated API must not leak to main window');

  // Invalid worldId
  assert.throws(() => {
    bridge.exposeInIsolatedWorld(-1, 'test', {});
  }, /worldId must be a positive integer/);

  assert.throws(() => {
    bridge.exposeInIsolatedWorld('invalid', 'test', {});
  }, /worldId must be a positive integer/);
}

// Contract 5: sanitizeBridgePayload cleans complex data structures and removes unsafe objects across context bridge boundary
{
  const unsafeData = {
    title: 'safe title',
    count: 10,
    nested: {
      active: true,
      __proto__: { injected: true },
    },
    fn: () => 'unsafe function',
  };

  const sanitized = sanitizeBridgePayload(unsafeData);
  assert.strictEqual(sanitized.title, 'safe title');
  assert.strictEqual(sanitized.count, 10);
  assert.strictEqual(sanitized.nested.active, true);
  assert.strictEqual(sanitized.fn, undefined, 'Functions in data payloads must be stripped');
  assert.strictEqual(Object.prototype.hasOwnProperty.call(sanitized.nested, 'injected'), false);
}

console.log('All contracts passed successfully.');

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