Add external subscription system

app/Livewire/UserSubscription.php

@@ -0,0 +1,70 @@
+<?php
+
+namespace App\Livewire;
+
+use App\Models\User;
+use App\Services\SubscriptionService;
+use Livewire\Component;
+use Livewire\Attributes\Computed;
+use Illuminate\Support\Facades\RateLimiter;
+
+class UserSubscription extends Component
+{
+    public $userId = 0;
+
+    public $subscriptionKey = '';
+
+    protected $rules = [
+        'subscriptionKey' => 'required|string|size:48',
+    ];
+
+    public function mount(User $user)
+    {
+        $this->userId = $user ? $user->id : auth()->user()->id;
+        $this->subscriptionKey = $user->subscription_key ?? '';
+    }
+
+    public function applyKey(SubscriptionService $subscriptionService)
+    {
+        $this->validate();
+
+        $rateLimitKey = "apply-subscription:{$this->userId}";
+        $rateLimitMinutes = 60 * 5; // 5 minutes
+
+        // Rate Limit to prevent users trying random keys
+        if (RateLimiter::tooManyAttempts($rateLimitKey, 1)) {
+            $seconds = RateLimiter::availableIn($rateLimitKey);
+            $this->addError('subscriptionKey', "Too many attempts. Try again in {$seconds} seconds.");
+            return;
+        }
+
+        RateLimiter::hit($rateLimitKey, $rateLimitMinutes);
+
+        // Check if token is already being used
+        $alreadyUsed = User::where('subscription_key', $this->subscriptionKey)
+            ->whereNot('id', $this->userId)
+            ->exists();
+
+        if ($alreadyUsed) {
+            $this->addError('subscriptionKey', 'Key already used!');
+            return;
+        }
+
+        $user = User::where('id', $this->userId)->firstOrFail();
+
+        // Verify token
+        $success = $subscriptionService->checkSubscriptionStatus($user, $this->subscriptionKey);
+        if (!$success) {
+            $this->addError('subscriptionKey', 'Invalid Key! If you believe this is a bug, please report this to the admin!');
+            return;
+        }
+        
+        $user->subscription_key = $this->subscriptionKey;
+        $user->save();
+    }
+
+    public function render()
+    {
+        return view('livewire.user-subscription');
+    }
+}