Csrf Validator Bundle Laravel Package

Getting Started

{Minimal steps, where to look first, first use case}

Read this first: it is not a Laravel package. korotovsky/csrf-validator-bundle is a Symfony bundle that validates CSRF tokens via doctrine annotations on controller actions. There is no service provider, no facade, no config/csrf.php, and no Laravel auto-discovery. A Laravel developer cannot composer require it and expect it to work in a Laravel app — the "day-to-day leverage" is therefore mostly as a reference implementation, or as a component you deliberately port.

Minimal path if you are evaluating it (30 minutes):

1. Open composer.json. Check the PHP and Symfony version constraints and whether it requires doctrine/annotations (removed from Symfony core in 7.0). If it pins Symfony 4/5-era versions or requires doctrine annotations, you already have your answer — it will not run on a modern stack.
2. Find the event listener/subscriber registered in the bundle's DependencyInjection extension. That listener is essentially the entire feature: it inspects the controller action for the annotation, extracts the token from the request, and throws/aborts on failure.
3. Read the annotation class. Note its parameters (typically the token id and the request parameter/header name) and the exception or status it raises on a mismatch. That tells you whether it fails closed or open — the single most important thing to verify about a CSRF primitive.
4. Note the failure behavior (403 vs 419 vs redirect). If it does not produce 419 TokenMismatchException-equivalent semantics, your client retry logic and error budgets will not match what Laravel clients expect.

First use case. The realistic first use case for a Laravel developer is not installation — it is using the package as a small, readable reference for how declarative per-endpoint CSRF enforcement is shaped, and then deciding it is redundant. On Laravel, the equivalent first use case is: open app/Http/Middleware/VerifyCsrfToken.php, confirm the middleware is registered in the HTTP kernel (or via bootstrap/app.php in Laravel 11), and confirm you have no wildcard $except entries beyond api/* if you run stateless tokens there.

Implementation Patterns

{Usage patterns, workflows, integration tips}

Declarative per-action enforcement is the pattern worth stealing. The package's core idea — annotate the controller action with the token requirement, let a listener validate before the controller runs — is a legitimate pattern for auditability: a reviewer can grep controller files and see exactly which actions are protected. If you have a security team demanding greppable evidence per endpoint, this is the shape to imitate.

In Laravel, the equivalent is the middleware, not an annotation. The day-to-day patterns:

• Global enforcement (default). VerifyCsrfToken runs on every web route. Do not reach for per-endpoint decorators; keep the default and narrow $except deliberately.
• Per-action opt-out (rare). When a single endpoint must bypass CSRF (e.g., an incoming server-to-server webhook authenticated by HMAC), put the path in $except and document why in the same commit. Never add a wildcard $except = ['*'] — that is the silent fail-open the package's unmaintained status warns against.
• Form submission. @csrf in Blade or csrf_field(). For AJAX from your own JS, read the XSRF-TOKEN cookie and send X-XSRF-TOKEN; Axios does this automatically once the cookie is set.
• SPA / Sanctum. For a stateful SPA, use Sanctum's /sanctum/csrf-cookie endpoint and let the framework's double-submit flow handle it. Do not build a parallel token mechanism.
• Token in a JSON body. Laravel's middleware reads the token from _token, the X-CSRF-TOKEN header, or X-XSRF-TOKEN. If you have a custom client, prefer the header so tokens never appear in request bodies or application logs.

If you are on Symfony and evaluating this bundle. The day-to-day pattern is: register the bundle, enable annotation reading, annotate the controller action, and rely on the listener to run before the controller. Test the happy path (valid token → controller runs) and the failure path (missing token → denied) with functional tests. Do not build this pattern on Laravel from a third-party dependency — implement it as a small middleware if you need it at all.

Porting pattern (only if you must). If the behavior is genuinely required and you cannot use VerifyCsrfToken, port rather than depend: a single middleware that reads a token, compares with hash_equals, and abort(419) on failure. Keep it under a hundred lines, own it, and write contract tests asserting denial on missing, malformed, and replayed tokens. That is a smaller long-term cost than tracking a 0-star, single-maintainer bundle.

Coverage audit workflow. The highest-leverage day-to-day use of the existence of this package is as a prompt: enumerate every state-changing route (POST/PUT/PATCH/DELETE), confirm each is under the web middleware group, and list any that are not. That audit gives the same evidence the package's annotations would, with no new dependency.

Gotchas and Tips

{Pitfalls, debugging, config quirks, extension points}

• Silent fail-open is the dominant risk. A CSRF validator that fails open on missing configuration or an unread annotation is indistinguishable from no protection until it is exploited. When you inspect or port this, assert that absent configuration denies rather than allows, and write a test that proves it.
• Doctrine annotations are a deprecated mechanism. Symfony removed annotations from core in favor of PHP 8 attributes. If the bundle only reads docblock annotations, adoption creates migration debt on day one. Symfony's native #[IsCsrfTokenValid] supersedes it.
• Session-bound tokens break horizontal scaling. If token state lives in the session, sticky sessions or shared session storage (Redis/DB) are mandatory, and multi-tab / long-lived-form / mobile-client flows get awkward. Laravel's web group has the same session dependency — this is exactly why API routes use Sanctum or double-submit rather than session tokens.
• Status code semantics. Laravel raises a 419 TokenMismatchException on CSRF failure. If a ported validator returns 403, 500, or a redirect instead, your clients' retry and re-authentication logic will not trigger correctly. Standardize on 419 and test it.
• Do not log or echo the token. If you treat the token as an ordinary request parameter in a form or JSON body, it will land in application logs and error payloads. Prefer the X-CSRF-TOKEN header and scrub it from log context.
• $except is a footgun. Every entry is a permanent, invisible CSRF exemption that survives refactors. Review $except alongside any route changes, and prefer explicit HMAC/signature auth on the excluded endpoint over "no CSRF but still authenticated."
• Testing. Use $this->withoutMiddleware(VerifyCsrfToken::class) in feature tests that are not about CSRF, and write at least one test that does assert 419 on a missing token — that is the test that catches a regression in your protection.
• Extension point on this bundle (and the reason not to use it). Adding behavior means extending a Symfony event subscriber with an annotation reader — none of that maps to Laravel's kernel. The equivalent Laravel extension point is your own middleware: add it to the web group in app/Http/Kernel.php (or bootstrap/app.php), keep it thin, and let the framework do the rest.
• Supply-chain sanity check. Zero stars, zero dependents, and a single maintainer mean no CVE response path and no downstream base to catch regressions. For a security primitive, the recommended move is to close the evaluation and point to VerifyCsrfToken plus a route coverage audit.}