Throw PrettyPageException when cipher is invalid

app/Providers/AppServiceProvider.php

@@ -7,7 +7,9 @@ use Event;
 use Utils;
 use App\Events;
 use App\Models\User;
+use ReflectionException;
 use Illuminate\Support\ServiceProvider;
+use App\Exceptions\PrettyPageException;
 
 class AppServiceProvider extends ServiceProvider
 {
@@ -40,6 +42,12 @@ class AppServiceProvider extends ServiceProvider
 
             $event->addContent('<script>var blessing = '.json_encode($blessing).';</script>');
         });
+
+        try {
+            $this->app->make('cipher');
+        } catch (ReflectionException $e) {
+            throw new PrettyPageException(trans('errors.cipher.unsupported', ['cipher' => config('secure.cipher')]));
+        }
     }
 
     /**
@@ -49,19 +57,7 @@ class AppServiceProvider extends ServiceProvider
      */
     public function register()
     {
-        // Register default cipher
-        $className = "App\Services\Cipher\\".config('secure.cipher');
-
-        if (class_exists($className)) {
-            $this->app->singleton('cipher', $className);
-        } else {
-            header('Content-Type: text/html; charset=UTF-8');
-            exit(sprintf(
-                '[Error] Unsupported encryption method: < %1$s >, please check your .env configuration <br>'.
-                '[错误] 不支持的密码加密方式 < %1$s >，请检查你的 .env 配置文件'
-            , config('secure.cipher')));
-        }
-
+        $this->app->singleton('cipher', 'App\Services\Cipher\\'.config('secure.cipher'));
         $this->app->singleton('users', \App\Services\Repositories\UserRepository::class);
         $this->app->singleton('parsedown', \Parsedown::class);
 

resources/lang/en/errors.yml

@@ -16,3 +16,6 @@ exception:
 plugins:
   duplicate: The plugin [:dir1] has a duplicated plugin name definition which is same to plugin [:dir2]. Please check your plugins directory, remove one of them or use another name definition.
   directory: We can't approach the path for loading plugins specified by the PLUGINS_DIR in .env file. Please check your configuration. Error :msg
+
+cipher:
+  unsupported: Unsupported encryption method `:cipher`, please check your `.env` configuration

resources/lang/zh_CN/errors.yml

@@ -17,3 +17,6 @@ exception:
 plugins:
   duplicate: 【插件定义重复】:dir1 目录下的插件与 :dir2 目录下的插件使用了相同的 name 定义并造成了冲突。请检查您的插件目录，移除其中一个插件或者使用不同的 name 属性。
   directory: 配置文件 .env 中指定的插件加载目录（PLUGINS_DIR）不存在或无法打开，请检查您的配置。错误信息：:msg
+
+cipher:
+  unsupported: 不支持的密码加密方式 `:cipher`，请检查你的 .env 配置文件