使用Symfony2& amp ;;通过API上传图像文件FOSRESTBundle

时间:2013-06-16 03:18:39

标签: api rest symfony fosrestbundle

我使用Symfony2,FOSRESTBundle和Vichuploader编写了一个像Instagram这样的照片共享应用程序的API,用于文件上传。

我能够解决GET和POST请求,但我找不到如何附加到POST请求的示例,实际图像,以便在我的情况下,Vichuploader可以抓住它并帮助我文件上传。

顺便说一句,我可以使用通过使用普通表单提到的堆栈上传文件而不会出现问题。

4 个答案:

答案 0 :(得分:16)

我一直在寻找关于完全相同问题的解决方案。这就是我所做的。

首先让我解释一下我的约束。我希望我的API是完整的JSON并且可以利用HTTP协议(标头,方法等)。我选择使用:

  • Symfony2代表“一切都为你完成,只需编写业务逻辑代码”。
  • Doctrine2,因为默认使用Symfony2并提供一种通过更改一行来与最流行的DBMS集成的方法。
  • FOSRestBundle用于处理我的API的REST部分(使用注释,正文监听器,使用JMSSerializer支持的响应的自动格式等最大限度地完成)。
  • KnpGaufretteBundle因为我希望能够快速更改blob文件的存储方式。

首先设想的解决方案:base64

我的第一个想法,因为我每次都在想JSON,就是在base64中编码所有传入的图像,然后在我的API中对它们进行解码并存储它们。

此解决方案的优势在于您可以将图像与其他数据一起传递。例如,在一次API调用中上传整个用户的配置文件。但我读到在base64中编码图像会使它们的初始大小增加33%。发送3张图片后,我不希望我的用户没有移动数据。

设想的第二个解决方案:表单

然后我想使用如上所述的表格。但我不知道我的客户端如何发送JSON数据(例如{"last_name":"Litz"})和图像数据(例如image/png)。我知道你可以处理Content-Type: multipart/form-data,但仅此而已。

另外我从一开始就没有在我的API中使用表单,我希望它在我的所有代码中都是统一的。 [mini-edit:hoho,我刚刚发现的东西,here]

第三个也是最后一个解决方案:使用HTTP ..

然后,一天晚上,启示。我正在使用Content-Type: application/json来发送JSON数据。为什么不使用image/*发送图片?在提出这个想法之前,我搜索了几天这么容易。这就是我做的(简化代码)。假设用户使用PUT /api/me/image

呼叫Content-Type: image/*
  1. UserController :: getUserImageAction(Request $ request) - 捕获请求

        // get the service to handle the image
        $service = $this->get('service.user_image');
        $content = $request->getContent();
        $userImage = $service->updateUserImage($user, $content);
    
        // get the response from FOSRestBundle::View
        $response = $this->view()->getResponse();
        $response->setContent($content);
        $response->headers->set('Content-Type', $userImage->getMimeType());
    
        return $response;
    
  2. UserImageService :: updateUserImage($ user,$ content) - 业务逻辑(我把所有内容都放在这里更简单易读)

        // Create a temporary file on the disk
        // the temp file will be delete at the end of the script
        // see http://www.php.net/manual/en/function.tmpfile.php
        $file = tmpfile();
        if ($file === false) 
            throw new \Exception('File can not be opened.');
    
        // Put content in this file
        $path = stream_get_meta_data($file)['uri'];
        file_put_contents($path, $content);
    
        // the UploadedFile of the user image
        // referencing the temp file (used for validation only)
        $uploadedFile = new UploadedFile($path, $path, null, null, null, true);
    
        // the UserImage to return
        $userImage = $user->getUserImage();
        if (is_null($userImage))
        {
            $userImage = new UserImage();
            $userImage->setOwner($user); 
            // auto persist with my configuration
            // plus generation of a unique ID that allows
            // me to retrieve the image at anytime
            $userImage->setKey(/*random string*/);
        }
    
        // fill the UserImage properties
        $userImage->setImage($uploadedFile);
        $userImage->setMimeType($uploadedFile->getMimeType());
    
        /** @var ConstraintViolationInterface $validationError */
        if (count($this->getValidator()->validate($userImage)) > 0)
            throw new \Exception('Validation');
    
        // if no error we can write the file definitively
        // [KnpGaufretteBundle code to store on disk]
        // [use the UserImage::key to store]
        $this->getEntityManager()->flush();
    
        return $userImage;
    

答案 1 :(得分:2)

您对FOSRestBundle的帖子使用表单类型:

例如,您有以下表单类型:

    public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
        ->add('facebook_id',
                'text',
                array(
                    'mapped' => FALSE
                )
            )
        ->add('profile_pic',
                'text',
                array(
                    'mapped' => FALSE
                )
            )
        ;

        $builder->addValidator(new CallbackValidator(function(FormInterface $form)
        {
            if ($form["facebook_id"]->getData() === '' || $form["facebook_id"]->getData() === NULL)
            {
                $form->get('facebook_id')->addError(new FormError('facebook_id should not be empty'));
            }
            if ($form["profile_pic"]->getData() === '' || $form["profile_pic"]->getData() === NULL)
            {
                $form->get('profile_pic')->addError(new FormError('profile_pic should not be empty'));
            }
        })
        );

}

public function setDefaultOptions(OptionsResolverInterface $resolver)
{

    $resolver->setDefaults(array(
        // 'validation_constraint' => $collectionConstraint,
        'csrf_protection' => FALSE,
    ));
}

public function getName()
{
    return 'data';
}

然后你可以做的是将JSON发布到API。执行POST时,不要忘记将标题设置为“Content-type = application / json”。

JSON结构如下所示:

{
"data": {
    "facebook_id": "12345",
    "profile_pic": 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}

}

为什么这个json包含在“数据”中?因为您的表单类型在getName中也有“data”,所以它将使用验证等。

我一直在做的是将图片编码为base64字符串,同时将它们发送到API。

然后在post函数中你只需将其转换回来:

$base64     = $form['profile_pic']->getData();
//decode back to image data and create image
$image      = imagecreatefromstring(base64_decode($base64));
imagepng($image, $path);

答案 2 :(得分:1)

这是api代码位的完整上传。这会上传文件,但我仍然无法验证上传的文件。希望这会有所帮助。

这使用REST的fosrest bundle。

private function addResource(Entity $resource) {
    $em = $this->getDoctrine()->getManager();
    $em->persist($resource);
    $em->flush();
}

private function processForm(Entity $resource)
{
    $em = $this->getDoctrine()->getManager();
    $uploadedFile = null;

    $form = $this->createForm(new EntityForm(), $resource);

    foreach ($_FILES as $file) {
        $uploadedFile = new UploadedFile(
            $file['tmp_name'], 
            $file['name'], $file['type'],
            $file['size'], $file['error'], 
            $test = false);
    }

    $submitData = array(
        "file" => $uploadedFile,
    );

    $form->submit($submitData);

    if ($form->isValid()) {
        $repository = $this->getDoctrine()
            ->getRepository('AcmeBundle:Product');

        $view = View::create();
        $resource->setFile($uploadedFile);

        // handling api requests
        if ($this->getRequest()->getMethod() == "POST") {

            $this->addResource($resource);

            // store image url
            $resource = $repository->find($resource->getId());

            if ($resource->getImage()) {
                $fs = new Filesystem();

                if ($fs->exists($resource->getWebPath())) {
                    $resource->setImagePath($resource->getWebPath());    
                }

                $this->addResource($resource);
            }

            $view->setData($resource);
        } 

        return $view;
    }

    return View::create($form);        
}

答案 3 :(得分:0)

发布帖子请求的上传方法示例:

public function uploadAction() {
    $em = $this->getDoctrine()->getManager();

    $document = new Document();

    foreach ($_FILES as $file) {

        $document->setTitle($file['name']);
        $document->file = new UploadedFile($file['tmp_name'], 
                          $file['name'], $file['type'],
                          $file['size'], $file['error'], $test = false);

        $em->persist($document);
        $em->flush();

        break;
    }

    $serializer = $this->get('jms_serializer');
    $data = $serializer->serialize(
          $document, 'json', 
          SerializationContext::create()->setGroups(array('someGroup')));

    return new Response($data);
}

因此,此操作首先将文档存储在服务器上,并返回包含文档元数据和路径的json响应。我在Web应用程序中使用响应进行进一步处理。

我不熟悉VichUploader,上面的代码是使用 Symfony \ Component \ HttpFoundation \ File \ UploadedFile 的原生Symfony2代码。

阅读:http://symfony.com/doc/current/cookbook/doctrine/file_uploads.html