fix(openapi): fix request body when multipart/form-data input format

src/OpenApi/Factory/OpenApiFactory.php

@@ -458,7 +458,7 @@ private function collectPaths(ApiResource $resource, ResourceMetadataCollection
                     $operationInputSchemas = [];
                     foreach ($requestMimeTypes as $operationFormat) {
                         $operationInputSchema = null;
-                        if (str_starts_with($operationFormat, 'json')) {
+                        if (str_starts_with($operationFormat, 'json') || 'multipart' === $operationFormat) {
                             $operationInputSchema = $this->jsonSchemaFactory->buildSchema($resourceClass, $operationFormat, Schema::TYPE_INPUT, $operation, $schema, null, $forceSchemaCollection);
                             $this->appendSchemaDefinitions($schemas, $operationInputSchema->getDefinitions());
                         }

tests/Fixtures/TestBundle/Entity/Issue7436/Issue7436.php

@@ -0,0 +1,41 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\Tests\Fixtures\TestBundle\Entity\Issue7436;
+
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\Post;
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\HttpFoundation\File\UploadedFile;
+
+#[ApiResource(
+    operations: [
+        new Post(
+            inputFormats: ['multipart' => ['multipart/form-data']],
+        ),
+    ]
+)]
+#[ORM\Entity]
+class Issue7436
+{
+    #[ORM\Column(type: 'integer')]
+    #[ORM\Id]
+    #[ORM\GeneratedValue(strategy: 'AUTO')]
+    private $id;
+    public ?UploadedFile $file = null;
+
+    public function getId()
+    {
+        return $this->id;
+    }
+}

tests/Functional/OpenApiTest.php

@@ -33,6 +33,7 @@
 use ApiPlatform\Tests\Fixtures\TestBundle\Entity\DummyFriend;
 use ApiPlatform\Tests\Fixtures\TestBundle\Entity\DummyTableInheritance;
 use ApiPlatform\Tests\Fixtures\TestBundle\Entity\DummyTableInheritanceChild;
+use ApiPlatform\Tests\Fixtures\TestBundle\Entity\Issue7436\Issue7436;
 use ApiPlatform\Tests\Fixtures\TestBundle\Entity\JsonSchemaResource;
 use ApiPlatform\Tests\Fixtures\TestBundle\Entity\JsonSchemaResourceRelated;
 use ApiPlatform\Tests\Fixtures\TestBundle\Entity\NoCollectionDummy;
@@ -100,6 +101,7 @@ public static function getResources(): array
             JsonSchemaResource::class,
             JsonSchemaResourceRelated::class,
             WrappedResponseEntity::class,
+            Issue7436::class,
         ];
     }
 
@@ -610,4 +612,27 @@ public function testRetrieveTheEntrypointWithUrlFormat(): void
         $this->assertResponseHeaderSame('content-type', 'application/vnd.openapi+json; charset=utf-8');
         $this->assertJson($response->getContent());
     }
+
+    public function testMultipartOperationHasCorrectOpenApiSchema(): void
+    {
+        $response = self::createClient()->request('GET', '/docs', [
+            'headers' => ['Accept' => 'application/vnd.openapi+json'],
+        ]);
+        $this->assertResponseIsSuccessful();
+        $json = $response->toArray();
+
+        $this->assertSame(
+            [
+                'type' => ['string', 'null'],
+                'format' => 'binary',
+            ],
+            $json['components']['schemas']['Issue7436']['properties']['file']
+        );
+        $this->assertSame(
+            [
+                'multipart/form-data' => ['schema' => ['$ref' => '#/components/schemas/Issue7436']],
+            ],
+            $json['paths']['/issue7436s']['post']['requestBody']['content']
+        );
+    }
 }