Kagawa Bundle Laravel Package

Getting Started

• Install the package with Composer (composer require <vendor>/<package>) and confirm the service provider is auto-discovered. If not, register it in config/app.php.
• Publish the package config first: php artisan vendor:publish --tag=config (check the package README for the exact tag). The config file is the primary place to understand how “Kagawa” requests are detected and what the default deny behaviour is.
• Look next at the middleware/validation rule the package exposes. That class is where the request-origin decision is made and where you will hook in custom logic.
• A sensible first use case is protecting a single route or route group where only requests identified as coming from Kagawa should proceed. Register the middleware on that group, hit the route from both a Kagawa and non-Kagawa context, and verify you get a clean denial rather than an exception.
• Make sure you install v1.0.1 or later. The v1.0.1 release fixes an error thrown when the request is not from Kagawa — which is the common path for most applications.

Implementation Patterns

• Route middleware: Apply the package middleware to specific route groups rather than globally. This keeps the region check opt-in and avoids surprising behaviour on health checks, auth callbacks, and webhook endpoints.
• Form request validation: If the package exposes a validation rule, use it inside a FormRequest so the failure is returned as a standard 422 validation error. This fits Laravel’s normal error-handling flow better than a hard abort in middleware.
• Conditional content: Use the package’s helper or facade (if provided) to branch presentation logic — for example, showing Kagawa-specific notices or options only when the current request qualifies.
• Testing: Write feature tests for both branches. Fake the request context (IP, header, or whatever the detector uses) so you can assert the allowed path and the denied path. The denied path is the one v1.0.1 fixed, so it deserves explicit coverage.
• Caching: If origin detection performs a lookup, cache the result per request or per session to avoid repeated work on multi-step flows.
• Integration tip: Keep the detection mechanism behind the package’s abstraction. If you need to swap the underlying resolver later, do it through config or a bound interface rather than editing vendor code.

Gotchas and Tips

• Pin >=1.0.1: Earlier versions could throw an error for non-Kagawa requests. If you see a 500 on requests that should simply be denied, check the installed version first.
• Local development will usually fail the check: Your local IP or test environment is unlikely to be classified as Kagawa. Add an explicit bypass for local/testing environments, or fake the detector in tests, so you do not block normal development.
• Proxy and load-balancer IPs: If detection relies on the client IP, make sure TrustProxies is configured correctly. Otherwise every request may appear to come from your proxy and the check becomes meaningless.
• Middleware ordering: Place the middleware after session/auth middleware if the package depends on session state, and before controllers that assume the request has already been validated.
• Graceful denial: Treat “not from Kagawa” as an expected outcome, not an exception. Return a 403, a redirect, or a validation error consistently, and log the decision at debug level so you can diagnose false negatives.
• Config caching: After changing package config, run php artisan config:clear in development. Stale cached config is a common reason the detector appears to ignore your settings.
• Extension points: Prefer the package’s published config and any bound resolver/geolocator interface for customisation. If the package emits events or exposes a facade, use those rather than subclassing internal classes, which are more likely to change between releases.