使用Laravel 4文件上传mime类型验证

Question

When I upload a well-formed MP3 file, Laravel 4 tells me it's not audio/mp3 but application/octet-stream , which makes this validation fails:

$validator = Validator::make(
    array('trackfile' => Input::file('trackfile')), 
    array('trackfile' => 'required|mimes:mp3')
);

if($validator->fails())
    return 'doesn\'t works because mime type is '.Input::file('trackfile')->getMimeType();
else
    return 'it works!';

Why doesn't it upload the file as an audio/mp3 file ?

(I already added 'files' => true to the form declaration)

Answer 1

Edit

Built-in validator was still considering some mp3's as application/octet-stream, wether you converted the original file with this or that software.

I finally used the MimeReader class by user Shane , which totally works. I'm still wondering why is it so hard to detect a right mime type though.

I implemented it as a validator in Laravel:

• Move MimeReader.phps in app/libraries/MimeReader.php (watch the extension)

• Extend the Laravel Validator (I put it in my BaseController constructor)

   Validator::extend('audio', function($attribute, $value, $parameters) { $allowed = array('audio/mpeg', 'application/ogg', 'audio/wave', 'audio/aiff'); $mime = new MimeReader($value->getRealPath()); return in_array($mime->get_type(), $allowed); }); 

• Add your error message in app/lang/[whatever]/validation.php (in my case, the key is audio )
• I can now use audio as a rule ! Example: 'file' => 'required|audio' , where file refers to Input::file('file')

---

Laravel was considering audio/mpeg files to be .mpga and not .mp3 . I corrected it in MimeTypeExtensionGuesser.php (in the Symfony library), along with audio/ogg that were considered as .oga . Maybe the audio mime-type depends on what software encoder was used.

Other method is to bypass the validator and check the mime-type directly into the controller using Input::file('upload')->getMimeType() like Sheikh Heera said.

Answer 2

It's probably because of mp3 file's mime type is audio/mpeg or could be that, it fails to recognize the mime_content_type and tells application/octet-stream as a generic/fallback type. You may try this rule (example given below) instead (not tested/sure), because audio/mpeg is the correct mime type for mp3 according to rfc3003 :

array('trackfile' => 'required|mimes:audio/mpeg,mp3')

Also, you may manually check the mime type using something like this:

$file = Input::file('upload');
if($file->getMimeType() == 'audio/mpeg') {
    // valid
}
else {
    // invalid
}

Update:

Specially, for mp3 files, you may also use a library getID3 which is similar to Php PECL extension id3 , if you use it, you will be also able to use ID3 tag of the file and can get information such as title , artist , album , year , genre etc.

If you use it, you have to download it manually from the given link ( getid3 ) and put it in a folder inside app , maybe app/libs/ and just put the getid3 folder from the extracted source into the libs folder then in your composer.json file add an entry inside classmap of autoload section like:

// ...
"app/tests/TestCase.php",
"app/libs/getid3"

Then run composer dump-autoload from terminal/command prompt and you are ready to use it. To use it symply try this:

$file = Input::file('upload'); // assumed name of the file input is upload
$path = $path = $file->getRealPath();
$id3 = new getID3();
$tags = $id3->analyze($path);
if(is_array($tags) && array_key_exists('audio', $tags)) {
    // valid
    dd($tag['tags']);
}

For a valid mp3 file You'll get an array like this:

array (size=2)   'id3v1' => 
    array (size=6)
      'title' => 
        array (size=1)
          0 => string '46. Piya Basanti' (length=16)
      'artist' => 
        array (size=1)
          0 => string '(Freshmaza.com)' (length=15)
      'album' =>
      ...

If you have already installed or can install the PECL extension using (from terminal) following command:

pear install pecl/id3

Then you may normally use

$tags = id3_get_tag( "path/to/example.mp3" );
print_r($tag);

The above example will output something similar to:

Array
(
    [title] => DN-38416
    [artist] => Re:\Legion
    [album] => Reflections
    [year] => 2004
    [genre] => 19
)

Check Php manual .