Zend Authentication Laravel Package

Getting Started

• This package is part of the archived Zend Framework (ZF) ecosystem; it's effectively legacy. While functional, modern Laravel applications should prefer Laravel’s built-in Auth system or Symfony’s Security component.
• PHP 7.3+ requirement: Ensure your project uses PHP 7.3+ (removed support for older versions).
• If maintaining a legacy ZF/Laminas app: install via Composer (composer require zendframework/zend-authentication:^2.7.0), then configure adapters (e.g., DbTable, Ldap, OAuth2) in config/autoload/auth.local.php (ZF style) or service manager.
• First use case: authenticating users against a database via Zend\Authentication\Adapter\DbTable. Example: create a class implementing AdapterInterface, call $authentication->authenticate($adapter).
• Basic Auth re-challenge: Updated behavior for Basic scheme authentication now re-challenges clients if credentials in the Authorization header cannot be base64 decoded (PR #42).

Implementation Patterns

• Adapter-centric workflow: Implement custom adapters by adhering to AdapterInterface and returning Result objects with status, identity, and messages.
• Storage abstraction: Use Zend\Authentication\Storage (e.g., Session) to persist identity post-authentication — inject into service layer for manual authentication ($auth->authenticate() → $auth->getStorage()->write($result->getIdentity())).
• Laminas Integration: If migrating to Laminas (the spiritual successor), replace zendframework/ with laminas/ namespaces (laminas/laminas-authentication). Service configuration moves to config/services.php or Module::getServiceConfig().
• DI & Service Layer: Register authenticator service (e.g., AuthService) using ServiceFactory, injecting storage + adapter — avoid direct calls to Zend\Authentication\AuthenticationService in controllers.
• Custom validation messages: Leverage the new Zend\Authentication\Validator\Authentication configuration option to map custom authentication result codes to validation messages (PR #47). Example:

  $validator = new AuthenticationValidator([
      'customCodes' => [
          'invalid_credentials' => 'Invalid username or password.',
          'account_locked' => 'Your account is temporarily locked.',
      ],
  ]);
  

• Basic Auth handling: For HTTP Basic Auth, ensure client-side handling accounts for re-challenge behavior when credentials are malformed.

Gotchas and Tips

• ❗ No active maintenance: Since ZF is archived (2020), use only in legacy apps. New projects should adopt laravel/ui, laravel/breeze, or Symfony’s security stack.
• Class namespace drift: If upgrading from ZF2 → Laminas, Zend\* classes are migrated to Laminas\*. Replace use Zend\Authentication\... → use Laminas\Authentication\....
• Session storage quirk: Laravel’s session is driver-agnostic, but Zend\Authentication\Storage\Session uses its own session handler — ensure compatible session start and namespace isolation to avoid collisions.
• Result inspection: Always check getResult()->isValid(), and review getMessages() for user-facing feedback — failed authentications return opaque errors without explicit logging.
• Extensibility: Extend DbTable adapter for multi-tenant auth (e.g., dynamic table names) or add custom credentials hashing by wrapping the adapter in a decorator that pre-processes credentials.
• PHP 7.3+ requirement: Ensure your project’s composer.json enforces PHP 7.3+ compatibility. Older versions are no longer supported (removed zend-stdlib v2 compatibility in PR #44).
• Basic Auth re-challenge: If implementing Basic Auth, account for the new re-challenge behavior. Clients must handle 401 Unauthorized responses with a WWW-Authenticate: Basic header and retry with valid credentials.
• Custom validation messages: Use the new validator configuration to provide granular control over error messages, improving UX for edge cases (e.g., locked accounts, rate limits).