使用Symfony2和FOSRESTBundle通过API上传图像文件
[英]Uploading image file through API using Symfony2 & FOSRESTBundle
问题描述
I have been coding an API for a photo sharing app like Instagram using Symfony2, FOSRESTBundle, and Vichuploader for file uploads. 
我一直使用Symfony2，FOSRESTBundle和Vichuploader为Instagram等照片共享应用程序编写API进行文件上传。
I'm able to work around GET and POST requests, but I can't find an example of how to attach to a POST request, the actual image so that in my case, Vichuploader can grab it and help me out with the file upload. 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完成文件上传。
By the way, I can upload a file without issue using the stack mentioned through the use of a normal form. 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没有问题。
4 个解决方案
解决方案1
17 2014-05-23 09:26:43
I have been looking for a solution about the exact same problem. 我一直在寻找关于完全相同问题的解决方案。 Here is what I did. 这就是我做的。
First let me explain my constraints. 首先让我解释一下我的约束。 I wanted my API to be full JSON and to take power of the HTTP protocol (headers, methods, etc.). 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）。 I chose to use: 我选择使用：
- Symfony2 for the "everything is almost done for you, just code your business logic". Symfony2用于“一切都为您完成，只需编写您的业务逻辑”。
- Doctrine2 because by default with Symfony2 and provide a way to integrate with most popular DBMS by changing one line. Doctrine2因为默认使用Symfony2并提供了一种通过更改一行来与最流行的DBMS集成的方法。
- FOSRestBundle to handle the REST part of my API (do the maximum with annotations, body listener, auto format for the response with JMSSerializer support, etc.). 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执行）。
- KnpGaufretteBundle because I wanted to be allowed to change the way I store blob file quickly. KnpGaufretteBundle因为我想被允许改变我快速存储blob文件的方式。
First solution envisaged: base64 设想的第一个解决方案：base64
My first thought, because I was thinking JSON everytime, was to encode all the incoming images in base64, then decode them inside my API and store them. 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。
The advantage with this solution is that you can pass images along with other data. 此解决方案的优点是您可以将图像与其他数据一起传递。 For instance upload a whole user's profile in one API call. 例如，在一次API调用中上传整个用户的配置文件。 But I read that encoding images in base64 make them grow by 33% of their initial size. 但我读到在base64中编码图像会使它们的初始大小增加33％。 I did not wanted my users to be out of mobile data after sending 3 images. 发送3张图片后，我不希望我的用户没有移动数据。
Second solution envisaged: form 设想的第二个解决方案：形式
Then I thought using forms as described above. 然后我想使用如上所述的表格。 But I did not know how my clients could send both JSON data (for instance {"last_name":"Litz"} ) and image data (for instance image/png one). 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 one）。 I know that you can deal with an Content-Type: multipart/form-data but nothing more. 我知道您可以处理Content-Type: multipart/form-data但仅此而已。
Plus I was not using forms in my API since the beginning and I wanted it to be uniform in all my code. 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, something I just discovered, here ] [迷你编辑：hoho，我刚发现的东西， 这里 ]
Third and last solution: use HTTP.. 倒数第三个解决方案：使用HTTP ..
Then, one night, the revelation. 然后，一天晚上，启示。 I'm using Content-Type: application/json for send JSON data. 我正在使用Content-Type: application/json来发送JSON数据。 Why not use image/* to send images? 为什么不使用image/*发送图像？ So easy that I searched for days before coming with this idea. 在提出这个想法之前，我搜索了几天这么容易。 This is how I did it (simplified code). 这就是我做的（简化代码）。 Let suppose that the user is calling PUT /api/me/image with a Content-Type: image/* 假设用户使用Content-Type: image/*调用PUT /api/me/image Content-Type: image/*
UserController::getUserImageAction(Request $request) - Catching the Request
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 $response;UserImageService::updateUserImage($user, $content) - Business Logic (I put everything here to be simplier to read)
UserImageService :: updateUserImage（$ 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;
解决方案2
2 2013-07-29 13:48:35
You use form types for posts with the FOSRestBundle: 您使用FOSRestBundle的帖子使用表单类型：
For example you have this form type: 例如，您有此表单类型：
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';
}
Then what you can do is post JSON to the API. 然后你可以做的是将JSON发布到API。 Don't forget to set the header as "Content-type = application/json" when you do a POST. 执行POST时，不要忘记将标题设置为“Content-type = application / json”。
The JSON structure would look like this: JSON结构如下所示：
{
"data": {
"facebook_id": "12345",
"profile_pic": 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}
} }
Why is this json wrapped in "data"? 为什么这个json包含在“数据”中？ Because your form type also has "data" in getName so it will use validation and etc. 因为您的表单类型在getName中也有“数据”所以它将使用验证等。
What I always do is I encode my pictures as a base64 string while sending them to the API. 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。
Then in the post function you just convert it back: 然后在post函数中你只需将它转换回来：
$base64 = $form['profile_pic']->getData();
//decode back to image data and create image
$image = imagecreatefromstring(base64_decode($base64));
imagepng($image, $path);
解决方案3
1 2013-10-31 05:57:55
This is a full upload from api code bit. 这是api代码位的完整上传。 This does upload the file, but I am still having trouble with validating the uploaded file. 这会上传文件，但我仍然无法验证上传的文件。 Hope this helps. 希望这可以帮助。
This uses fosrest bundle for REST. 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);
}
解决方案4
0 2013-06-29 03:47:22
An example for a upload method exepting post requests: 上传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);
}
So this action first stores the document on the server and returns a json response containing document meta data and path. 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。 I used the response for further processing in my web application. 我在Web应用程序中使用响应进行进一步处理。
I am not familiar with VichUploader, the above code is native Symfony2 code using Symfony\\Component\\HttpFoundation\\File\\UploadedFile . 我不熟悉VichUploader，上面的代码是使用Symfony \\ Component \\ HttpFoundation \\ File \\ UploadedFile的原生Symfony2代码。
Read: http://symfony.com/doc/current/cookbook/doctrine/file_uploads.html 阅读： http ： //symfony.com/doc/current/cookbook/doctrine/file_uploads.html
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