Laravel 5验证失败（字段未设置）

Question

Hi im currently coding a gallery in laravel 5 where you can upload images and videos in separted categorys and i got a pretty strange problem with the valdidation method.

The image upload itself works fine and does exactly what it should. But if i try to upload videos (mp4,webm) my Validation always fails with the error, that the file field is required. But if i try the same with a wrong mime type file all works like intended and i the validation method says its the wrong mime type.

The view looks the following:

@extends('templates.base')
@section('content')
@parent
{!! Form::open(['url' => '/gallery/upload/' .$gallery->id, 'files' => true]) !!}
<div>
    {!! $error !!}
</div>
<table>
    <tr>
        <td>
            Title:
        </td>
        <td>
            {!! Form::text('title',old('title'),['class' => 'form_text', 'min' => '3', 'max' => '255']) !!}
        </td>
    </tr>
    <tr>
        <td>
            Description:
        </td>
        <td>
            {!! Form::textarea('description') !!}
        </td>
    </tr>
    <tr>
        <td>
            File:
        </td>
        <td>
            <input type="hidden" name="MAX_FILE_SIZE" value="30000" />
            {!! Form::file('file') !!}
        </td>
    </tr>
    <tr>
        <td>
            External:
        </td>
        <td>
            <select name="external">
                <option value="0" default>No</option>
                <option value="1">Yes</option>}
            </select>
        </td>
    </tr>
    <tr>
        <td>{!! Form::submit(trans('strings.create'),['class' => 'form_submit news']) !!}</td>
    </tr>
</table>
{!! Form::close() !!}
@stop

The controller looks something like this:

if (config('gallery.allowUploads')) {
        if (config('gallery.allowUserUploads')) {
            $gallery = Gallery::find($request->route('id'));

            if (is_null($request->route('id')) || count($gallery) <= 0) {
                return redirect()->back();
            }

            if ($request->isMethod('post')) {
                if ($gallery->type == 'i') {
                    $Validator = Validator::make($request->all(), [
                        'title'       => 'required|min:3|max:255',
                        'description' => 'max:10000',
                        'file'        => 'required|mimes:jpg,jpeg,bmp,png,gif',
                        'external'    => 'required|in:0,1',
                    ]);
                } elseif ($gallery->type == 'v') {
                    $Validator = Validator::make($request->all(), [
                        'title'       => 'required|min:3|max:255',
                        'description' => 'max:10000',
                        'file'        => 'required|mimes:mp4,webm',
                        'external'    => 'required|in:0,1',
                    ]);
                } else {
                    $Validator = Validator::make($request->all(), [
                        'title'       => 'required|min:3|max:255',
                        'description' => 'max:10000',
                        'file'        => 'required|mimes:zip,rar,7z',
                        'external'    => 'required|in:0,1',
                    ]);
                }
                $error = "";

                if ($Validator->fails()) {
                    foreach ($Validator->messages()->All() as $m) {
                        $error .= $m . "</br>";
                    }
                    return view('gallery/items/create', ['gallery' => $gallery, 'error' => $error);
                }

When im uploading a webm

dd($request->file('file'),$gallery->type);

returns

UploadedFile {#29 ▼
   -test: false
   -originalName: "big-buck-bunny_trailer.webm"
   -mimeType: "application/octet-stream"
   -size: 0
   -error: 1
   }
   "v"

But the Validation Method still says it fails because the file field is required.

I just feel like i'm overlooking something. Thanks for your help.

edit:

i just found that when im uploading an image file i get

UploadedFile {#29 ▼
   -test: false
   -originalName: "a8b5KQQ_460s_v1.jpg"
   -mimeType: "image/jpeg"
   -size: 53991
   -error: 0
}
"v"

that error is 0 and on the webm file its 1 but i'm not sure what it means.

Answer 1

From the output it looks like the file is empty and for some reason an mime type cannot be found. If you delve into symfony\Httpfoundation\File\UploadedFile you will see the constructor has the following assignment:

$this->mimeType = $mimeType ?: 'application/octet-stream';

Which seems to be why you are getting application/octet-stream as your Mime Type.

Because Laravels request->file('file'); returns an instance of symfony\Httpfoundation\File\UploadedFile - which performs some checks on the file when the object is constructed - I would guess that whatever error is detected causes Laravel to assume that no file has been uploaded and therefore doesn't perform the validation.

Either way, the file doesn't make it on to your server, which is good. Incidentally, you should be able to call $request->file('file')->getErrorMessage(); which should tell you what it thinks the problem was.