implement localization

app/Http/Controllers/LanguageController.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Http\Requests\UpdateLanguageRequest;
+use Illuminate\Http\RedirectResponse;
+
+class LanguageController extends Controller
+{
+    /**
+     * Handle the incoming request.
+     */
+    public function __invoke(UpdateLanguageRequest $request): RedirectResponse
+    {
+        $validated = $request->validated();
+
+        return back()->withCookie(cookie(
+            (string) config('localization.cookie', 'locale'),
+            (string) $validated['locale'],
+            60 * 24 * 365,
+            (string) config('session.path', '/'),
+            config('session.domain'),
+            config('session.secure'),
+            true,
+            false,
+            config('session.same_site', 'lax'),
+        ));
+    }
+}

app/Http/Middleware/HandleInertiaRequests.php

@@ -35,19 +35,58 @@ class HandleInertiaRequests extends Middleware
      */
     public function share(Request $request): array
     {
+        $fallbackLocale = (string) config('app.fallback_locale');
+        $locale = app()->getLocale();
+        $locales = $this->locales();
+        $direction = $locales[$locale]['direction'] ?? 'ltr';
+
         return [
             ...parent::share($request),
             'name' => config('app.name'),
             'auth' => [
                 'user' => $request->user(),
             ],
-            'fallbackLocale' => (string) config('app.fallback_locale'),
-            'locale' => app()->getLocale(),
+            'fallbackLocale' => $fallbackLocale,
+            'locale' => $locale,
+            'localization' => [
+                'locale' => $locale,
+                'fallbackLocale' => $fallbackLocale,
+                'direction' => $direction,
+                'isRtl' => $direction === 'rtl',
+                'locales' => $this->localeOptions($locales),
+            ],
             'sidebarOpen' => ! $request->hasCookie('sidebar_state') || $request->cookie('sidebar_state') === 'true',
             'translations' => fn () => $this->translations(),
         ];
     }
 
+    /**
+     * @return array<string, array{name: string, native_name: string, direction: string}>
+     */
+    private function locales(): array
+    {
+        $locales = config('localization.locales', []);
+
+        return is_array($locales) ? $locales : [];
+    }
+
+    /**
+     * @param  array<string, array{name: string, native_name: string, direction: string}>  $locales
+     * @return array<int, array{code: string, name: string, nativeName: string, direction: string}>
+     */
+    private function localeOptions(array $locales): array
+    {
+        return collect($locales)
+            ->map(fn (array $locale, string $code): array => [
+                'code' => $code,
+                'name' => $locale['name'],
+                'nativeName' => $locale['native_name'],
+                'direction' => $locale['direction'],
+            ])
+            ->values()
+            ->all();
+    }
+
     /**
      * @return array<string, string>
      */

app/Http/Middleware/SetLocale.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\App;
+use Illuminate\Support\Facades\Cookie;
+use Symfony\Component\HttpFoundation\Response;
+
+class SetLocale
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  Closure(Request): (Response)  $next
+     */
+    public function handle(Request $request, Closure $next): Response
+    {
+        $cookieName = (string) config('localization.cookie', 'locale');
+        $supportedLocales = array_keys((array) config('localization.locales', []));
+        $cookieLocale = $request->cookie($cookieName);
+        $configuredLocale = (string) config('app.locale', 'en');
+
+        $locale = $this->validLocale($cookieLocale, $supportedLocales)
+            ?? $this->validLocale($configuredLocale, $supportedLocales)
+            ?? $this->validLocale((string) config('app.fallback_locale', 'en'), $supportedLocales)
+            ?? 'en';
+
+        App::setLocale($locale);
+
+        $response = $next($request);
+
+        if ($request->hasCookie($cookieName) && $this->validLocale($cookieLocale, $supportedLocales) === null) {
+            $response->headers->setCookie(Cookie::forget(
+                $cookieName,
+                (string) config('session.path', '/'),
+                config('session.domain'),
+            ));
+        }
+
+        return $response;
+    }
+
+    /**
+     * @param  array<int, string>  $supportedLocales
+     */
+    private function validLocale(mixed $locale, array $supportedLocales): ?string
+    {
+        if (! is_string($locale)) {
+            return null;
+        }
+
+        return in_array($locale, $supportedLocales, true) ? $locale : null;
+    }
+}

app/Http/Requests/UpdateLanguageRequest.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace App\Http\Requests;
+
+use Illuminate\Contracts\Validation\ValidationRule;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class UpdateLanguageRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     */
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array<string, ValidationRule|array<mixed>|string>
+     */
+    public function rules(): array
+    {
+        return [
+            'locale' => ['required', 'string', Rule::in(array_keys((array) config('localization.locales', [])))],
+        ];
+    }
+}