Phil Skentelbery d4f1bfb198 feat: Implement Phase 3 authentication module with IndieLogin support ...

Implement complete authentication system following ADR-010 and Phase 3 design specs.
This is a MINOR version increment (0.3.0 -> 0.4.0) as it adds new functionality.

Authentication Features:
- IndieLogin authentication flow via indielogin.com
- Secure session management with SHA-256 token hashing
- CSRF protection with single-use state tokens
- Session lifecycle (create, verify, destroy)
- require_auth decorator for protected routes
- Automatic cleanup of expired sessions
- IP address and user agent tracking

Security Measures:
- Cryptographically secure token generation (secrets module)
- Token hashing for storage (never plaintext)
- SQL injection prevention (prepared statements)
- Single-use CSRF state tokens
- 30-day session expiry with activity refresh
- Comprehensive security logging

Implementation Details:
- starpunk/auth.py: 406 lines, 6 core functions, 4 helpers, 4 exceptions
- tests/test_auth.py: 648 lines, 37 tests, 96% coverage
- Database schema updates for sessions and auth_state tables
- URL validation utility added to utils.py

Test Coverage:
- 37 authentication tests
- 96% code coverage (exceeds 90% target)
- All security features tested
- Edge cases and error paths covered

Documentation:
- Implementation report in docs/reports/
- Updated CHANGELOG.md with detailed changes
- Version incremented to 0.4.0
- ADR-010 and Phase 3 design docs included

Follows project standards:
- Black code formatting (88 char lines)
- Flake8 linting (no errors)
- Python coding standards
- Type hints on all functions
- Comprehensive docstrings

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

2025-11-18 20:35:36 -07:00

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