feat(cloudflare): add HMAC-signed state for CSRF protection in OAuth flow#625
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…flow Replace base64-encoded state parameters with HMAC-signed compact format to prevent tampering and replay attacks during OAuth approval flow. Key changes: - State parameters now include signature, issued-at, and expiry timestamps - 10-minute expiry window prevents replay attacks - Signature verification ensures state integrity - Comprehensive tests for tampering, expiry, and secret validation Security improvements: - CSRF protection via cryptographic signatures - Time-bound state prevents stale approval attempts - Tamper detection for clientId and other OAuth parameters 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Code <noreply@anthropic.com>
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Replace base64-encoded state parameters with HMAC-signed compact format to prevent tampering and replay attacks during OAuth approval flow.
Key changes:
Security improvements:
🤖 Generated with Claude Code