Merge branch '4.1' into 4.2

* 4.1:
  [Security\Http] detect bad redirect targets using backslashes
  [Form] Filter file uploads out of regular form types
  Fix CI
  minor #28258 [travis] fix composer.lock invalidation for deps=low (nicolas-grekas)
  [travis] fix composer.lock invalidation for PRs patching several components
  [travis] fix composer.lock invalidation for deps=low
  minor #28199 [travis][appveyor] use symfony/flex to accelerate builds (nicolas-grekas)
  [travis] ignore ordering when validating composer.lock files for deps=low
  minor #28146 [travis] cache composer.lock files for deps=low (nicolas-grekas)
  fix ci
  [travis] fix requiring mongodb/mongodb before composer up
  minor #28114 [travis] merge "same Symfony version" jobs in one (nicolas-grekas)
  [2.7] Make CI green
  updated VERSION for 2.7.49
  updated CHANGELOG for 2.7.49
  [HttpKernel] fix trusted headers management in HttpCache and InlineFragmentRenderer
  [HttpFoundation] Remove support for legacy and risky HTTP headers
  updated VERSION for 2.7.48
  update CONTRIBUTORS for 2.7.48
  updated CHANGELOG for 2.7.48

Author: nicolas-grekas

Extension/Core/Type/FileType.php

@@ -105,6 +105,7 @@ public function configureOptions(OptionsResolver $resolver)
             'data_class' => $dataClass,
             'empty_data' => $emptyData,
             'multiple' => false,
+            'allow_file_upload' => true,
         ));
     }
 

Extension/Core/Type/FormType.php

@@ -180,6 +180,7 @@ public function configureOptions(OptionsResolver $resolver)
             'attr' => array(),
             'post_max_size_message' => 'The uploaded file was too large. Please try to upload a smaller file.',
             'upload_max_size_message' => $uploadMaxSizeMessage, // internal
+            'allow_file_upload' => false,
             'help' => null,
             'help_attr' => array(),
         ));

Form.php

@@ -532,6 +532,11 @@ public function submit($submittedData, $clearMissing = true)
             $submittedData = null;
         } elseif (is_scalar($submittedData)) {
             $submittedData = (string) $submittedData;
+        } elseif ($this->config->getOption('allow_file_upload')) {
+            // no-op
+        } elseif ($this->config->getRequestHandler()->isFileUpload($submittedData)) {
+            $submittedData = null;
+            $this->transformationFailure = new TransformationFailedException('Submitted data was expected to be text or number, file upload given.');
         }
 
         $dispatcher = $this->config->getEventDispatcher();
@@ -541,6 +546,10 @@ public function submit($submittedData, $clearMissing = true)
         $viewData = null;
 
         try {
+            if (null !== $this->transformationFailure) {
+                throw $this->transformationFailure;
+            }
+
             // Hook to change content of the data submitted by the browser
             if ($dispatcher->hasListeners(FormEvents::PRE_SUBMIT)) {
                 $event = new FormEvent($this, $submittedData);

Tests/CompoundFormTest.php

@@ -709,7 +709,7 @@ public function testSubmitPostOrPutRequestWithSingleChildForm($method)
             'REQUEST_METHOD' => $method,
         ));
 
-        $form = $this->getBuilder('image')
+        $form = $this->getBuilder('image', null, null, array('allow_file_upload' => true))
             ->setMethod($method)
             ->setRequestHandler(new HttpFoundationRequestHandler())
             ->getForm();
@@ -1081,6 +1081,21 @@ public function testDisabledButtonIsNotSubmitted()
         $this->assertFalse($submit->isSubmitted());
     }
 
+    public function testFileUpload()
+    {
+        $reqHandler = new HttpFoundationRequestHandler();
+        $this->form->add($this->getBuilder('foo')->setRequestHandler($reqHandler)->getForm());
+        $this->form->add($this->getBuilder('bar')->setRequestHandler($reqHandler)->getForm());
+
+        $this->form->submit(array(
+            'foo' => 'Foo',
+            'bar' => new UploadedFile(__FILE__, 'upload.png', 'image/png', UPLOAD_ERR_OK),
+        ));
+
+        $this->assertSame('Submitted data was expected to be text or number, file upload given.', $this->form->get('bar')->getTransformationFailure()->getMessage());
+        $this->assertNull($this->form->get('bar')->getData());
+    }
+
     protected function createForm()
     {
         return $this->getBuilder()

Tests/Fixtures/Descriptor/resolved_form_type_1.json

@@ -28,6 +28,7 @@
         "parent": {
             "Symfony\\Component\\Form\\Extension\\Core\\Type\\FormType": [
                 "action",
+                "allow_file_upload",
                 "attr",
                 "auto_initialize",
                 "block_name",

Tests/Fixtures/Descriptor/resolved_form_type_1.txt

@@ -8,15 +8,16 @@ Symfony\Component\Form\Extension\Core\Type\ChoiceType (Block prefix: "choice")
   choice_attr                 FormType             FormType                  FormTypeCsrfExtension  
   choice_label               -------------------- ------------------------- ----------------------- 
   choice_loader               compound             action                    csrf_field_name        
-  choice_name                 data_class           attr                      csrf_message           
-  choice_translation_domain   empty_data           auto_initialize           csrf_protection        
-  choice_value                error_bubbling       block_name                csrf_token_id          
-  choices                     trim                 by_reference              csrf_token_manager     
-  expanded                                         data                                             
-  group_by                                         disabled                                         
-  multiple                                         help                                             
-  placeholder                                      help_attr                                        
-  preferred_choices                                inherit_data                                     
+  choice_name                 data_class           allow_file_upload         csrf_message           
+  choice_translation_domain   empty_data           attr                      csrf_protection        
+  choice_value                error_bubbling       auto_initialize           csrf_token_id          
+  choices                     trim                 block_name                csrf_token_manager     
+  expanded                                         by_reference                                     
+  group_by                                         data                                             
+  multiple                                         disabled                                         
+  placeholder                                      help                                             
+  preferred_choices                                help_attr                                        
+                                                   inherit_data                                     
                                                    label                                            
                                                    label_attr                                       
                                                    label_format                                     

Tests/Fixtures/Descriptor/resolved_form_type_2.json

@@ -4,6 +4,7 @@
     "options": {
         "own": [
             "action",
+            "allow_file_upload",
             "attr",
             "auto_initialize",
             "block_name",

Tests/Fixtures/Descriptor/resolved_form_type_2.txt

@@ -6,6 +6,7 @@ Symfony\Component\Form\Extension\Core\Type\FormType (Block prefix: "form")
   Options                  
  ------------------------- 
   action                   
+  allow_file_upload        
   attr                     
   auto_initialize          
   block_name