feat: add @descope/csp - CSP policy builder package by omercnet · Pull Request #1312 · descope/descope-js

omercnet · 2026-01-18T13:03:40Z

Summary

Adds @descope/csp - a TypeScript-first, zero-dependency Content Security Policy (CSP) builder for Descope integrations.

Motivation

Customers deploying Descope flows need to configure CSP policies with environment-specific URLs (staging, production, self-hosted). Console-app also has complex CSP middleware that could be simplified and made reusable.

This package provides a clean, type-safe way to:

Generate secure CSP policies for Descope integrations
Customize API/CDN URLs per environment
Merge custom rules with Descope defaults
Use presets for common third-party integrations

Key Features

Core

✅ Minimal Descope defaults (based on web-component CSP requirements)
✅ Environment-specific URL customization (5 URLs: api, cdn, static, images, content)
✅ Cryptographically secure nonce generation
✅ Additive policy merging (never overwrites)
✅ Framework-agnostic output (object + string)
✅ Full TypeScript definitions
✅ Zero runtime dependencies
✅ ~2KB minified

Presets (from console-app)

✅ googleFonts - Google Fonts integration
✅ segment - Segment analytics
✅ featureOS - Feature OS widgets
✅ devRev - DevRev platform
✅ jsdelivr - jsDelivr CDN fallback
✅ npmRegistry - NPM registry access
✅ descopeInternal - Descope internal tools

Usage Examples

Minimal

import { createDescopeCSP } from '@descope/csp';
const csp = createDescopeCSP();
// Output: "script-src 'self' https://static.descope.com https://descopecdn.com; ..."

With Environment URLs

const csp = createDescopeCSP({
  urls: {
    api: process.env.DESCOPE_API_URL || 'api.descope.com',
    cdn: process.env.DESCOPE_CDN_URL || 'descopecdn.com',
  }
});

With Nonce

import { generateNonce } from '@descope/csp';
const nonce = generateNonce();
const csp = createDescopeCSP({ nonce });

Console-App Migration

import { presets } from '@descope/csp';

const csp = createDescopeCSP({
  nonce,
  presets: [
    presets.googleFonts,
    presets.segment,
    presets.featureOS,
    presets.devRev,
    presets.jsdelivr,
    presets.npmRegistry,
    presets.descopeInternal,
  ],
});

Alignment with Web Component

Based on packages/sdks/web-component/src/app/index.html CSP requirements.

Web Component (minimal):

script-src: 'self' static.descope.com descopecdn.com
img-src: static.descope.com content.app.descope.com imgs.descope.com data:
connect-src: 'self' static.descope.com api.descope.com

Our Output (minimal):

script-src: 'self' https://static.descope.com https://descopecdn.com
img-src: https://static.descope.com https://content.app.descope.com https://imgs.descope.com data:
connect-src: 'self' https://static.descope.com https://api.descope.com

✅ Perfect match!

Testing

50 tests - All passing ✅
83% coverage - Statements
97% coverage - Branches
87% coverage - Lines

Tests cover:

Nonce generation (randomness, encoding)
Descope defaults (URLs, directives)
Policy merging (deduplication, additive)
CSP serialization (string formatting)
Builder API (all options)
All 7 presets

Package Structure

packages/libs/csp/
├── src/
│   ├── types.ts          # TypeScript definitions
│   ├── nonce.ts          # Cryptographic nonce generation
│   ├── defaults.ts       # Descope minimal defaults
│   ├── merge.ts          # Policy merging logic
│   ├── serialize.ts      # CSP string formatting
│   ├── builder.ts        # Main createDescopeCSP function
│   ├── presets.ts        # 7 presets (console-app integrations)
│   └── index.ts          # Public API
├── test/                 # Jest test suite (50 tests)
├── examples/             # Usage examples
├── jest.config.cjs       # Jest configuration
├── package.json
├── tsconfig.json
├── rollup.config.mjs
└── README.md             # Complete documentation

Use Cases

Web Component Users - Customers deploying Descope flows can easily generate secure CSP with environment-specific URLs
Console-App Migration - Console-app can replace its middleware.js CSP logic with this package
SDK Integrations - Other Descope SDKs (nextjs-sdk, react-sdk) can use this for CSP generation

Next Steps

Publish to npm (after merge)
Migrate console-app to use this package
Add to main descope-js README
Consider integration into nextjs-sdk/react-sdk

Breaking Changes

None - this is a new package.

Checklist

Tests added and passing (50 tests, 83%+ coverage)
Documentation complete (README, examples, JSDoc)
TypeScript types exported
Zero runtime dependencies
Build succeeds (ESM + CJS)
Package.json configured correctly

- Zero-dependency CSP builder for Descope integrations - Environment-specific URL customization (api, cdn, static, images) - Cryptographically secure nonce generation - Additive policy merging with Descope defaults - TypeScript-first with full type definitions - Framework-agnostic core (ESM + CJS) - Built-in presets (Google Fonts, Segment) - Based on web-component CSP requirements - Package size: ~2KB minified - Includes comprehensive README and examples

- Add content.app.descope.com to img-src (was missing) - Remove unnecessary directives (default-src, media-src, object-src, etc.) - Only include minimal required directives: script-src, img-src, connect-src - Add style-src only when nonce is provided - Match exact web-component CSP structure from src/app/index.html

Add all third-party integrations from console-app as reusable presets: - featureOS: Feature OS widgets (script-src, frame-src) - devRev: DevRev platform (script-src, connect-src, frame-src) - jsdelivr: jsDelivr CDN fallback (script-src, connect-src) - npmRegistry: NPM registry access for flow-components - descopeInternal: Descope internal tools (dev-panel, static assets) This allows console-app to easily migrate to this package while keeping all existing CSP integrations as composable presets. Updated README with preset documentation and console-app migration example.

- Add Jest configuration with 80%+ coverage thresholds - Test nonce generation (6 tests) - Test Descope defaults with URL customization (9 tests) - Test CSP merging and deduplication (8 tests) - Test CSP serialization (9 tests) - Test builder with all options (12 tests) - Test all 7 presets (8 tests) Total: 52 tests, all passing Coverage: 83% statements, 97% branches, 87% lines

vercel · 2026-01-18T13:03:46Z

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nx-cloud · 2026-01-18T13:03:50Z

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☁️ Nx Cloud last updated this comment at 2026-01-18 13:12:54 UTC

Copilot

Pull request overview

This PR adds @descope/csp, a new TypeScript package for building Content Security Policy headers for Descope integrations. The package provides type-safe CSP generation with environment-specific URL customization, cryptographic nonce generation, additive policy merging, and presets for common third-party integrations (Google Fonts, Segment, etc.).

Changes:

New @descope/csp package with builder API, nonce generation, and 7 integration presets
Comprehensive test suite (50 tests) with 80%+ coverage thresholds
Full TypeScript definitions and dual ESM/CJS builds

Reviewed changes

Copilot reviewed 21 out of 22 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/libs/csp/package.json	Package configuration with dual ESM/CJS exports, MIT license, zero runtime dependencies (tslib only)
packages/libs/csp/src/types.ts	Complete TypeScript type definitions for CSP directives, options, and results
packages/libs/csp/src/nonce.ts	Cryptographic nonce generation with browser/Node.js crypto fallback
packages/libs/csp/src/defaults.ts	Descope default CSP rules with URL customization and HTTPS enforcement
packages/libs/csp/src/merge.ts	Additive CSP policy merging with deduplication
packages/libs/csp/src/serialize.ts	CSP-to-string serialization for HTTP headers
packages/libs/csp/src/builder.ts	Main API combining defaults, presets, and custom extensions
packages/libs/csp/src/presets.ts	7 presets for Google Fonts, Segment, Feature OS, DevRev, jsDelivr, NPM, Descope internal
packages/libs/csp/src/index.ts	Public exports (functions and types)
packages/libs/csp/test/*.test.ts	Comprehensive test suite covering all modules (6 test files, 50 tests)
packages/libs/csp/rollup.config.mjs	Rollup build configuration for ESM/CJS dual output with TypeScript declarations
packages/libs/csp/tsconfig.json	TypeScript configuration targeting ES2017 with strict mode
packages/libs/csp/jest.config.cjs	Jest configuration with coverage thresholds (80%+ for most metrics)
packages/libs/csp/README.md	Complete documentation with API reference, examples, and framework integrations
packages/libs/csp/examples/*.ts	Usage examples for Next.js middleware and basic usage patterns
pnpm-lock.yaml	Updated lockfile with new package dependencies and web-components-ui version bumps

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Copilot · 2026-01-18T13:06:11Z

packages/libs/csp/src/nonce.ts

+    );
+  }
+
+  return btoa(Array.from(array, (byte) => String.fromCharCode(byte)).join(''));


The use of btoa on line 26 will cause runtime errors in Node.js environments before version 18, as btoa is only available in Node.js 18+. Since the package targets ES2017 and includes Node.js environments (based on the dual crypto fallback), this could break for users on Node.js < 18.

Consider using Node.js's Buffer.from(data).toString('base64') when in a Node.js environment, or add a polyfill. The fallback pattern is already present for crypto, a similar approach should be used for base64 encoding.

Suggested change

return btoa(Array.from(array, (byte) => String.fromCharCode(byte)).join(''));

// Prefer browser/global btoa when available, otherwise fall back to Node's Buffer.

if (typeof btoa === 'function') {

return btoa(

Array.from(array, (byte) => String.fromCharCode(byte)).join(''),

);

}

if (typeof Buffer !== 'undefined') {

return Buffer.from(array).toString('base64');

}

throw new Error('No base64 implementation available');

Copilot · 2026-01-18T13:06:11Z

packages/libs/csp/jest.config.cjs

+  coverageThreshold: {
+    global: {
+      branches: 80,
+      functions: 65,


The jest.config.cjs sets the function coverage threshold to 65%, but the PR description claims 87% coverage for lines and implies comprehensive coverage. This discrepancy suggests either the claimed coverage numbers are inaccurate or the threshold is set too low. Consider raising the function coverage threshold to match the actual achieved coverage, or verify the actual coverage metrics align with what's claimed in the PR description.

Copilot · 2026-01-18T13:06:11Z

packages/libs/csp/src/nonce.ts

+  } else if (typeof require !== 'undefined') {
+    const nodeCrypto = require('crypto');
+    nodeCrypto.randomFillSync(array);


The use of dynamic require('crypto') may cause issues with bundlers and ESM-only environments. Since the package is configured as "type": "module" in package.json, and uses ESM imports throughout, this dynamic require could fail in pure ESM environments or cause bundler warnings.

Consider using a static import with conditional usage, or handle the Node.js crypto import more gracefully for ESM compatibility.

omercnet added 5 commits January 18, 2026 12:15

docs: add final summary document

c707ac5

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feat: add @descope/csp - CSP policy builder package#1312

feat: add @descope/csp - CSP policy builder package#1312
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-  return btoa(Array.from(array, (byte) => String.fromCharCode(byte)).join(''));
+  // Prefer browser/global btoa when available, otherwise fall back to Node's Buffer.
+  if (typeof btoa === 'function') {
+    return btoa(
+      Array.from(array, (byte) => String.fromCharCode(byte)).join(''),
+    );
+  }
+  if (typeof Buffer !== 'undefined') {
+    return Buffer.from(array).toString('base64');
+  }
+  throw new Error('No base64 implementation available');

Conversation

omercnet commented Jan 18, 2026

Summary

Motivation

Key Features

Core

Presets (from console-app)

Usage Examples

Minimal

With Environment URLs

With Nonce

Console-App Migration

Alignment with Web Component

Testing

Package Structure

Use Cases

Next Steps

Breaking Changes

Checklist

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