验证 Laravel 中的 base64 解码图像

Validate a base64 decoded image in laravel

提问by Jorge Almonacid

Im trying to get a image from a PUT request for update a user picture(using postman), and make it pass through a validation in Laravel 5.2, for making the call in postman use the following url:

我试图从 PUT 请求中获取图像以更新用户图片（使用邮递员），并使其通过 Laravel 5.2 中的验证，以便在邮递员中使用以下网址进行调用：

http://localhost:8000/api/v1/users?_method=PUT

http://localhost:8000/api/v1/users?_method=PUT

and send the image string in the body, using a json like this:

并在正文中发送图像字符串，使用这样的 json：

{
    "picture" : "data:image/png;base64,this-is-the-base64-encode-string"
}

In the controller try a lot of differents ways for decode the image and try to pass the validation:

在控制器中尝试多种不同的方式解码图像并尝试通过验证：

1. First I tried this:

   $data = request->input('picture');
   $data = str_replace('data:image/png;base64,', '', $data);
   $data = str_replace(' ', '+', $data);
   $image = base64_decode($data);
   $file = app_path() . uniqid() . '.png';
   $success = file_put_contents($file, $image);
   

2. Then I tried this:

   list($type, $data) = explode(';', $data);
   list(, $data) = explode(',', $data);
   $data = base64_decode($data);
   $typeFile = explode(':', $type);
   $extension = explode('/', $typeFile[1]);
   $ext = $extension[1];
   Storage::put(public_path() . '/prueba.' . $ext, $data);
   $contents = Storage::get(base_path() . '/public/prueba.png');
   

3. Try to use the intervention image library (http://image.intervention.io/) and don't pass:

   $image = Image::make($data);
   $image->save(app_path() . 'test2.png');
   $image = Image::make(app_path() . 'test1.png');
   

1. 首先我试过这个：

   $data = request->input('picture');
   $data = str_replace('data:image/png;base64,', '', $data);
   $data = str_replace(' ', '+', $data);
   $image = base64_decode($data);
   $file = app_path() . uniqid() . '.png';
   $success = file_put_contents($file, $image);
   

2. 然后我尝试了这个：

   list($type, $data) = explode(';', $data);
   list(, $data) = explode(',', $data);
   $data = base64_decode($data);
   $typeFile = explode(':', $type);
   $extension = explode('/', $typeFile[1]);
   $ext = $extension[1];
   Storage::put(public_path() . '/prueba.' . $ext, $data);
   $contents = Storage::get(base_path() . '/public/prueba.png');
   

3. 尝试使用干预图像库（http://image.intervention.io/）并且不要通过：

   $image = Image::make($data);
   $image->save(app_path() . 'test2.png');
   $image = Image::make(app_path() . 'test1.png');
   

This is the validation in the controller:

这是控制器中的验证：

    $data = [
        'picture' => $image,
        'first_name' => $request->input('first_name'),
        'last_name' => $request->input('last_name')
    ];

    $validator = Validator::make($data, User::rulesForUpdate());
    if ($validator->fails()) {
        return $this->respondFailedParametersValidation('Parameters failed validation for a user picture');
    } 

this is the validation in the User-model:

这是用户模型中的验证：

public static function rulesForUpdate() {
    return [
        'first_name' => 'max:255',
        'last_name' => 'max:255',
        'picture' => 'image|max:5000|mimes:jpeg,png'
    ];
}   

回答by Mike McLin

If you are using Intervention anyways, then you can leverage it for a custom validation rule. I have one called "imageable". It basically makes sure that the input given will be able to be converted to an Intervention image. Base64 data image strings will pass. A string of "foo" will not.

如果您无论如何都在使用干预，那么您可以将其用于自定义验证规则。我有一个叫做“可成像”的。它基本上确保给定的输入能够转换为干预图像。Base64 数据图像字符串将通过。一串“foo”不会。

Validator::extend('imageable', function ($attribute, $value, $params, $validator) {
    try {
        ImageManagerStatic::make($value);
        return true;
    } catch (\Exception $e) {
        return false;
    }
});

This obviously just checks that the input is able to be converted to an image. However, it should show you as a use-case how you can leverage Intervention and any of it's methods to create a custom rule.

这显然只是检查输入是否能够转换为图像。但是，它应该作为用例向您展示如何利用 Intervention 及其任何方法来创建自定义规则。

回答by jnieto

You can extend the Validator class of Laravel.

您可以扩展 Laravel 的 Validator 类。

Laravel Doc

Laravel 文档

But anyway try this

但无论如何试试这个

Validator::extend('is_png',function($attribute, $value, $params, $validator) {
    $image = base64_decode($value);
    $f = finfo_open();
    $result = finfo_buffer($f, $image, FILEINFO_MIME_TYPE);
    return $result == 'image/png';
});

Don't forget the rules:

不要忘记规则：

$rules = array(
   'image' => 'is_png'
);

回答by Hamodea Net

inside extend function add this

在扩展功能内添加这个

$res= mime_content_type($value);
if ($res == 'image/png' || $res == 'image/jpeg') {
    return $res;
}