Filament FileUpload access cancel action

To handle a rollback when a file upload verification fails in a Filament form, you can utilize Laravel's validation and Filament's form handling capabilities. Here's a step-by-step solution:

1. Define the FileUpload Field: Use the FileUpload field in your Filament form and specify the validation rules.

2. Custom Validation Rule: Create a custom validation rule to check the uploaded file. You can do this by creating a new rule class using the Artisan command:

   php artisan make:rule CustomFileValidation
   

   Implement the passes method in your rule class to define the logic for your custom validation.

   <?php
   
   namespace App\Rules;
   
   use Illuminate\Contracts\Validation\Rule;
   
   class CustomFileValidation implements Rule
   {
       public function passes($attribute, $value)
       {
           // Implement your custom validation logic here
           // Return true if validation passes, false otherwise
           return true; // or false based on your logic
       }
   
       public function message()
       {
           return 'The uploaded file did not pass the custom validation.';
       }
   }
   

3. Apply the Custom Rule in the Form: In your Filament form, apply the custom validation rule to the FileUpload field.

   use App\Rules\CustomFileValidation;
   use Filament\Forms\Components\FileUpload;
   
   FileUpload::make('file')
       ->label('Upload File')
       ->rules(['required', new CustomFileValidation()])
   

4. Handle Rollback Logic: If the validation fails, Laravel will automatically handle the rollback of the transaction if you are using database transactions. However, if you need to perform additional rollback actions (like deleting a temporary file), you can handle this in the failedValidation method of a custom request or in the catch block of a try-catch statement around your form processing logic.

   Here's an example of handling additional rollback logic:

   try {
       // Your form processing logic here
   } catch (\Illuminate\Validation\ValidationException $e) {
       // Perform rollback actions here, like deleting temporary files
       // Example: Storage::delete($temporaryFilePath);
   
       // Re-throw the exception to ensure the validation error is reported
       throw $e;
   }
   

By following these steps, you can ensure that your custom validation logic is applied to the file upload, and any necessary rollback actions are performed if the validation fails.