Added new blocklist feature and list-unsubscribe behaviour

app/Http/Controllers/BlocklistCheckController.php

@@ -0,0 +1,104 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\Alias;
+use App\Models\BlockedSender;
+use App\Models\Domain;
+use App\Models\Username;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+use Illuminate\Support\Str;
+
+class BlocklistCheckController extends Controller
+{
+    /**
+     * Check if the given From: address (or domain) is blocked for the recipient's user.
+     * Used by Rspamd on mail servers. Query params: recipient, from_email.
+     */
+    public function check(Request $request): JsonResponse
+    {
+        $validated = $request->validate([
+            'recipient' => ['required', 'string', 'max:254'],
+            'from_email' => ['required', 'string', 'max:254'],
+        ]);
+
+        $recipient = strtolower($validated['recipient']);
+        $fromEmail = strtolower($validated['from_email']);
+
+        $fromDomain = Str::contains($fromEmail, '@')
+            ? Str::afterLast($fromEmail, '@')
+            : null;
+
+        [$userId, $alias] = $this->resolveUserAndAlias($recipient);
+
+        if ($userId === null) {
+            return response()->json(['block' => false]);
+        }
+
+        $blockedSender = BlockedSender::where('user_id', $userId)
+            ->where('type', 'email')
+            ->where('value', $fromEmail)
+            ->first();
+
+        if ($blockedSender === null && $fromDomain !== null) {
+            $blockedSender = BlockedSender::where('user_id', $userId)
+                ->where('type', 'domain')
+                ->where('value', $fromDomain)
+                ->first();
+        }
+
+        if ($blockedSender === null) {
+            return response()->json(['block' => false]);
+        }
+
+        $blockedSender->increment('blocked', 1, ['last_blocked' => now()]);
+
+        if ($alias !== null) {
+            $alias->increment('emails_blocked', 1, ['last_blocked' => now()]);
+        }
+
+        return response()->json(['block' => true]);
+    }
+
+    /**
+     * Resolve envelope recipient to user_id and alias in a single pass.
+     *
+     * @return array{0: string|null, 1: Alias|null}
+     */
+    private function resolveUserAndAlias(string $recipient): array
+    {
+        $aliasEmail = Str::contains($recipient, '+')
+            ? Str::before($recipient, '+').'@'.Str::afterLast($recipient, '@')
+            : $recipient;
+
+        $alias = Alias::where('email', $aliasEmail)->first();
+
+        if ($alias !== null) {
+            return [$alias->user_id, $alias];
+        }
+
+        $parts = explode('@', $recipient, 2);
+
+        if (count($parts) !== 2) {
+            return [null, null];
+        }
+
+        [, $domain] = $parts;
+
+        $allDomains = config('anonaddy.all_domains', []);
+
+        foreach ($allDomains as $parentDomain) {
+            if (str_ends_with($domain, '.'.$parentDomain)) {
+                $subdomain = substr($domain, 0, -strlen($parentDomain) - 1);
+                $userId = Username::where('username', $subdomain)->value('user_id');
+
+                return [$userId, null];
+            }
+        }
+
+        $userId = Domain::where('domain', $domain)->value('user_id');
+
+        return [$userId, null];
+    }
+}