Laravel 5.5 升級到 5.5.42 後遇到的 Cookie 序列化問題

最近手殘升級了項目裏 Laravel 的小版本號（v5.5.39 => v5.5.45），這不升級則已，一升級就出了問題！

Sentry 平臺上提示錯誤：openssl_encrypt() expects parameter 1 to be string, array given，具體報錯記錄以下：

ErrorException
openssl_encrypt() expects parameter 1 to be string, array given
vendor/laravel/framework/src/Illuminate/Encryption/Encrypter.php in handleError at line 91
vendor/sentry/sentry/lib/Raven/Breadcrumbs/ErrorHandler.php in handleError at line 34
vendor/sentry/sentry/lib/Raven/Breadcrumbs/ErrorHandler.php in openssl_encrypt
vendor/laravel/framework/src/Illuminate/Encryption/Encrypter.php in encrypt at line 91
vendor/laravel/framework/src/Illuminate/Cookie/Middleware/EncryptCookies.php in encrypt at line 139
vendor/laravel/framework/src/Illuminate/Cookie/Middleware/EncryptCookies.php in handle at line 66
vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php in Illuminate\Pipeline\{closure} at line 149
vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php in Illuminate\Routing\{closure} at line 53
vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php in then at line 102
vendor/laravel/framework/src/Illuminate/Routing/Router.php in runRouteWithinStack at line 660
vendor/laravel/framework/src/Illuminate/Routing/Router.php in runRoute at line 635
vendor/laravel/framework/src/Illuminate/Routing/Router.php in dispatchToRoute at line 601
vendor/laravel/framework/src/Illuminate/Routing/Router.php in dispatch at line 590
vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php in Illuminate\Foundation\Http\{closure} at line 176
vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php in Illuminate\Routing\{closure} at line 30
vendor/barryvdh/laravel-debugbar/src/Middleware/InjectDebugbar.php in handle at line 58
vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php in Illuminate\Pipeline\{closure} at line 149
vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php in Illuminate\Routing\{closure} at line 53
vendor/fideloper/proxy/src/TrustProxies.php in handle at line 56
vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php in Illuminate\Pipeline\{closure} at line 149
vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php in Illuminate\Routing\{closure} at line 53
vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php in handle at line 30
vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php in Illuminate\Pipeline\{closure} at line 149
vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php in Illuminate\Routing\{closure} at line 53
vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php in handle at line 30
vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php in Illuminate\Pipeline\{closure} at line 149
vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php in Illuminate\Routing\{closure} at line 53
vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ValidatePostSize.php in handle at line 27
vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php in Illuminate\Pipeline\{closure} at line 149
vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php in Illuminate\Routing\{closure} at line 53
vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/CheckForMaintenanceMode.php in handle at line 46
vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php in Illuminate\Pipeline\{closure} at line 149
vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php in Illuminate\Routing\{closure} at line 53
vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php in then at line 102
vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php in sendRequestThroughRouter at line 151
vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php in handle at line 116
public/index.php at line 55

仔細查看上面的異常堆棧記錄，而且進行斷點調試，最終肯定是因爲 Laravel 5.5 升級小版本後 Cookie 加密的邏輯變更所致使的報錯。

查閱 Laravel 官方文檔（Laravel 5.5 Upgrade Guide）後得知，Laravel 新版爲了防止 PHP 對象的序列化/反序列化漏洞被利用，再也不對 Cookie 值進行自動的序列化和反序列化處理。

舉個栗子：

\Cookie::queue('user', ['id' => 1, 'name' => 'admin'], 720, '/')

Laravel 更新到 v5.5.42 後，由於 Laravel 再也不自動對 Cookie 值 ['id' => 1, 'name' => 'admin'] 進行序列化處理，而 openssl_encrypt ( string $data ... ) 只能加密字符串數據，這個時候程序就會拋出錯誤：openssl_encrypt() expects parameter 1 to be string, array given。

解決方法：

• 新版裏面在中間件 AppHttpMiddlewareEncryptCookies 新增靜態屬性 $serialize，當設置爲 true 時可開啓 Cookie 值的自動序列化和反序列化處理。

/**
 * Indicates if cookies should be serialized.
 *
 * @var bool
 */
protected static $serialize = true;

• 【推薦】將 Cookie 值使用 JSON 函數編碼成字符串後再進行存儲（獲取 Cookie 值後需調用 JSON 函數進行解碼）。

\Cookie::queue('user', json_encode(['id' => 1, 'name' => 'admin']), 720, '/');

-EOF-

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