Technical Evaluation

Architecture Fit

Lightweight & Purpose-Built: Laravel Sanctum is explicitly designed for SPAs (Single-Page Applications) and simple APIs, aligning perfectly with modern Laravel-based microservices, mobile backends, or decoupled frontend architectures.
Token-Based Auth: Leverages stateless HTTP tokens (via personal_access_tokens table) instead of sessions, reducing server-side storage overhead and enabling seamless cross-domain/authentication flows.
Laravel Ecosystem Integration: Built for Laravel’s authentication contract system, enabling seamless integration with Laravel’s built-in auth (e.g., Auth::user(), HasApiTokens trait) and middleware (auth:sanctum).
Stateless vs. Stateful: Supports both stateless (API tokens) and stateful (CSRF-protected cookies) modes, allowing flexibility for different use cases (e.g., mobile apps vs. web SPAs).

Integration Feasibility

Minimal Boilerplate: Installation via Composer (laravel/sanctum) + php artisan vendor:publish --provider="Laravel\Sanctum\SanctumServiceProvider" + migrations (php artisan migrate).
Database Requirements: Adds a single personal_access_tokens table (or uses existing oauth_personal_access_tokens in Laravel 10+). No complex schema changes.
Middleware & Routes: Auto-registers auth:sanctum middleware and /sanctum/csrf-cookie, /sanctum/token endpoints. Can be customized via config (config/sanctum.php).
Customization Points:
- Token generation (createToken() methods on models).
- Token retrieval (getAccessTokenFromRequestUsing).
- Guard configuration (multiple guards supported).
- Token expiration and revocation logic.

Technical Risk

Risk Area	Assessment	Mitigation
Laravel Version Lock	Tight coupling with Laravel (v11+ in v4.x). Downgrading/upgrading Laravel may require Sanctum updates.	Monitor Laravel/Sanctum compatibility matrix. Use feature flags or modularize auth if version flexibility is critical.
Token Security	Tokens are not encrypted by default (stored as plaintext in DB). Vulnerable to DB leaks if not using HTTPS or additional encryption (e.g., Laravel Encryption).	Enable `stateful` mode for CSRF protection, use HTTPS, and consider encrypting tokens at rest (e.g., via Laravel’s `encrypt()`).
Performance	Token lookup uses `where('tokenable_id', $id)->where('token', $token)` by default. Scaling to millions of tokens may require indexing (already added in v4.2.0).	Ensure `tokenable_id` and `token` columns are indexed. For high-scale APIs, consider sharding tokens or using a dedicated cache (Redis) for token validation.
Stateful Mode Complexity	Stateful mode (cookies) introduces CSRF and session-like behavior, which may conflict with stateless APIs or CDNs.	Use stateless mode for APIs; reserve stateful for SPAs. Configure `stateful` domains explicitly in `config/sanctum.php`.
Token Revocation	Manual revocation requires deleting tokens from DB. No built-in TTL for stateless tokens (unlike OAuth).	Implement a `token_pruner` job (via Laravel Queues) to expire tokens after inactivity (e.g., `last_used_at` tracking in v4.3.0).
Custom User Providers	Sanctum assumes Laravel’s default `User` model. Custom providers (e.g., API keys) require manual guard configuration.	Extend `Sanctum::guard()` or create a custom guard implementation.

Key Questions for TPM

Use Case Clarity:
- Is Sanctum replacing Laravel Passport (OAuth2) or API Tokens (e.g., for internal services)?
- Will it handle both SPAs and mobile apps (stateful/stateless) or just one?
Scaling Needs:
- What’s the expected token volume (e.g., 10K vs. 10M tokens)? Are indexes sufficient, or is Redis caching needed?
- Are token revocation or expiration critical (e.g., for compliance)?
Security Requirements:
- Are tokens PII-sensitive? If so, is encryption at rest required?
- Should tokens be scoped (e.g., role-based access)?
Integration Complexity:
- Does the existing system use custom auth guards or non-Laravel User models?
- Are there legacy systems relying on sessions that Sanctum’s stateless approach might disrupt?
Operational Overhead:
- Who manages token rotation (e.g., for compromised tokens)?
- Is there a backup plan if Sanctum’s DB table becomes a bottleneck?

Integration Approach

Stack Fit

Laravel-Centric: Ideal for Laravel 11+ applications using PHP 8.4+. Leverages Laravel’s:
- Authentication contracts (Illuminate\Contracts\Auth\Authenticatable).
- Middleware pipeline (auth:sanctum).
- Eloquent models (HasApiTokens trait).
Frontend Compatibility:
- SPAs: Works with React, Vue, Next.js (stateful mode).
- Mobile: Stateless tokens for iOS/Android apps.
- Third-Party APIs: Stateless tokens for internal services.
Database Support: MySQL, PostgreSQL, SQLite (via Laravel migrations).
Caching: Optional Redis integration for token validation (customizable via getAccessTokenFromRequestUsing).

Migration Path

Step	Action	Dependencies
1. Assessment	Audit existing auth (e.g., sessions, API keys, Passport). Identify endpoints/models needing Sanctum.	None.
2. Setup	Install Sanctum: `composer require laravel/sanctum`. Publish config/migrations: `php artisan vendor:publish --provider="Laravel\Sanctum\SanctumServiceProvider"`. Run migrations.	Laravel 11+, PHP 8.4+.
3. Model Integration	Add `HasApiTokens` trait to user models. Configure token namespaces (e.g., `createToken('mobile-app')`).	Eloquent models.
4. Route Protection	Apply `auth:sanctum` middleware to API routes. For SPAs, enable stateful mode in `config/sanctum.php`.	Laravel routing.
5. Frontend Setup	Configure frontend to send tokens (stateless: `Authorization: Bearer <token>`; stateful: cookies).	SPA framework (e.g., Axios for React).
6. Testing	Test token generation, revocation, and scope-based access. Validate CSRF protection for stateful requests.	Postman/Newman or custom test suites.
7. Monitoring	Set up logging for token usage (e.g., `last_used_at`). Monitor failed auth attempts.	Laravel Horizon or custom logs.
8. Rollback Plan	Document steps to revert to legacy auth if issues arise (e.g., token migration failures).	Backup DB schema.

Compatibility

Laravel Versions: Officially supports 11+ (v4.x). Backward compatibility for 10+ in v3.x.
PHP Versions: 8.4+ (v4.x). PHP 8.1+ for v3.x.
Database: Works with Laravel-supported DBs (MySQL, PostgreSQL, SQLite). No schema changes if using oauth_personal_access_tokens.
Middleware: Plays well with Laravel’s api middleware group. Can coexist with Passport if needed.
Caching: No native Redis support, but can be extended via getAccessTokenFromRequestUsing.

Sequencing

Phase 1: Pilot (Non-Prod)
- Integrate Sanctum in a staging environment for a single SPA or API.
- Test token generation, revocation, and frontend flows.
Phase 2: Gradual Rollout
- Migrate one service/API at a time, using feature flags to toggle Sanctum.
- Monitor token performance and auth failures.
Phase 3: Full Cutover
- Deprecate legacy auth (e.g., sessions/API keys) post-validation.
- Update documentation and frontend SDKs to use Sanctum tokens.

Airlock Laravel Package

Technical Evaluation

Architecture Fit

Integration Feasibility

Technical Risk

Key Questions for TPM

Integration Approach

Stack Fit

Migration Path

Compatibility

Sequencing

Operational Impact