Image uploaded through inertiajs form.post fails mime image validation in Laravel 8-CodePudding

Laravel version: 8.82.0

I am uploading an image with inertiajs by making a post request with form.post method. An image data is received in controller as depicted in an image below:

My simplified controller:

public function store(){
    
    Request()->validate([
        'thumbnail' => 'required|mimes:png,jpeg,jpg|max:2048'

        // Also tried, still fails.
        // 'thumbnail' => 'required|image|mimes:png,jpeg,jpg|max:2048'

    ]);
    
    return Redirect::route('showcases.index');

}

Upon ariving header content-type is application/json, I tried changing it to multipart/form-data but to no avail, image validation still fails.

The error I get is: The thumbnail must be a file of type: png, jpeg, jpg

CodePudding user response：

you are trying to validate a base64 string instead of a file. in the string format laravel validation cant validate the mime type. so you may try to extend the validation rules and try a better way. Inside the AppServiceProvider put the custom validation(there are many other cleaner ways)

public function boot()
{
    Validator::extend('image64', function ($attribute, $value, $parameters, $validator) {
        $type = explode('/', explode(':', substr($value, 0, strpos($value, ';')))[1])[1];
        if (in_array($type, $parameters)) {
            return true;
        }
        return false;
    });

    Validator::replacer('image64', function($message, $attribute, $rule, $parameters) {
        return str_replace(':values',join(",",$parameters),$message);
    });
}

now you can do :

'thumbnail' => 'required|image64:jpeg,jpg,png'