Manage redirects, missing URLs, repositories and settings through the API

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/Http/Controllers/Api/V1/SettingController.php

@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Controllers\Api\V1;
+
+use App\Http\Controllers\Controller;
+use App\Http\Resources\SettingResource;
+use App\Models\Setting;
+use App\Support\ContentVersion;
+use App\Support\Maintenance;
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\AnonymousResourceCollection;
+
+/**
+ * Runtime settings, as the panel's settings screen shows them: the ones that
+ * exist, each value as the JSON it is. None is created or deleted from here.
+ */
+class SettingController extends Controller
+{
+    /**
+     * Written by the application, never by hand: a hand-set content version
+     * would leave the frontend's cache serving stale pages or refetching them
+     * for nothing.
+     */
+    protected const READ_ONLY = [ContentVersion::KEY];
+
+    public function index(Request $request): AnonymousResourceCollection
+    {
+        $this->authorize('settings.view');
+
+        return SettingResource::collection(Setting::query()->orderBy('key')->get());
+    }
+
+    public function show(Setting $setting): SettingResource
+    {
+        $this->authorize('settings.view');
+
+        return SettingResource::make($setting);
+    }
+
+    public function update(Request $request, Setting $setting): SettingResource
+    {
+        // Taking the site down is its own permission, in the panel as here.
+        $this->authorize($setting->key === Maintenance::KEY ? 'settings.maintenance' : 'settings.update');
+
+        abort_if(in_array($setting->key, self::READ_ONLY, true), 403, __('rules.settings.read_only'));
+
+        // `present` rather than `required`: null is a value a setting may hold.
+        $request->validate(['value' => ['present']]);
+
+        $setting->update(['value' => $request->input('value')]);
+
+        return SettingResource::make($setting);
+    }
+}