Imported from jeremylongshore/tons-of-skills-marketplace (skills/.curated/gamma-security-basics/SKILL.md). Install upstream with npx skills add jeremylongshore/tons-of-skills-marketplace --skill gamma-security-basics. Copyright stays with the author (MIT).

Gamma Security Basics

Output

Maintain a security receipt with identity scope, secret reference, access-review date, control result, owner, and redacted incident state. Do not include tokens or private content.

Examples

Use a scoped staging credential and fictional deck to verify least-privilege access, revoke it, and confirm access is denied without exposing content or credentials in evidence.

Overview

Security best practices for Gamma API integration to protect credentials and data.

Prerequisites

• Active Gamma integration
• Environment variable support
• Understanding of secret management

Instructions

Step 1: Secure API Key Storage

// NEVER do this
const gamma = new GammaClient({
  apiKey: 'gamma_live_abc123...', // Hardcoded - BAD!
});

// DO this instead
const gamma = new GammaClient({
  apiKey: process.env.GAMMA_API_KEY,
});

Environment Setup:

# .env (add to .gitignore!)
GAMMA_API_KEY=gamma_live_abc123...

# Load in application
import 'dotenv/config';

Step 2: Key Rotation Strategy

// Support multiple keys for rotation
const gamma = new GammaClient({
  apiKey: process.env.GAMMA_API_KEY_PRIMARY
    || process.env.GAMMA_API_KEY_SECONDARY,
});

// Rotation script
async function rotateApiKey() {
  // 1. Generate new key in Gamma dashboard
  // 2. Update GAMMA_API_KEY_SECONDARY
  // 3. Deploy and verify
  // 4. Swap PRIMARY and SECONDARY
  // 5. Revoke old key
}

Step 3: Request Signing (if supported)

import crypto from 'crypto';

function signRequest(payload: object, secret: string): string {
  const timestamp = Date.now().toString();
  const message = timestamp + JSON.stringify(payload);

  return crypto
    .createHmac('sha256', secret)
    .update(message)
    .digest('hex');
}

// Usage with webhook verification
function verifyWebhook(body: string, signature: string, secret: string): boolean {
  const expected = crypto
    .createHmac('sha256', secret)
    .update(body)
    .digest('hex');

  return crypto.timingSafeEqual(
    Buffer.from(signature),
    Buffer.from(expected)
  );
}

Step 4: Access Control Patterns

// Scoped API keys (if supported)
const readOnlyGamma = new GammaClient({
  apiKey: process.env.GAMMA_API_KEY_READONLY,
  scopes: ['presentations:read', 'exports:read'],
});

const fullAccessGamma = new GammaClient({
  apiKey: process.env.GAMMA_API_KEY_FULL,
});

// Permission check before operations
async function createPresentation(user: User, data: object) {
  if (!user.permissions.includes('gamma:create')) {
    throw new Error('Insufficient permissions');
  }
  return fullAccessGamma.presentations.create(data);
}

Step 5: Audit Logging

import { GammaClient } from '@gamma/sdk';

function createAuditedClient(userId: string) {
  return new GammaClient({
    apiKey: process.env.GAMMA_API_KEY,
    interceptors: {
      request: (config) => {
        console.log(JSON.stringify({
          timestamp: new Date().toISOString(),
          userId,
          action: `${config.method} ${config.path}`,
          type: 'gamma_api_request',
        }));
        return config;
      },
    },
  });
}

Security Checklist

• API keys stored in environment variables
• .env files in .gitignore
• No keys in source code or logs
• Key rotation procedure documented
• Minimal permission scopes used
• Audit logging enabled
• Webhook signatures verified
• HTTPS enforced for all calls

Error Handling

Resources

• Gamma Security Guide
• API Key Management
• OWASP API Security

Next Steps

Proceed to gamma-prod-checklist for production readiness.