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Some files are set as "application/octet-stream" type – Photoshop

I have weird problem, that when I try to upload different files, some of them are recognized correctly, but some are not and are set as application/octet-stream when you check their type $_FILES['file_1']['type']

Debug Objects: png
Debug Objects: image/png
Debug Objects: php
Debug Objects: application/octet-stream
Debug Objects: rar
Debug Objects: application/octet-stream
Debug Objects: psd
Debug Objects: application/octet-stream

I contacted my hosting company, they told me its not an error on their side and that it might be related to CloudFlare, but I never had such problem before.

I know that RAR has application/octet-stream as one of possible mime types, but not PHP or PSD.

Those are types for PSD:

application/x-photoshop
image/vnd.adobe.photoshop

And those are for PHP:

application/x-httpd-php
application/php
application/x-php
text/php
text/x-php
application/x-httpd-php-source

Does somebody have idea why its doing this? I tried it in IE, FireFox, Chrome and Opera. Happens in all of those browsers.

Is there better way of checking for types? As the ones I am checking are sent by browser, which can be spoofed (I am also checking for extensions for more security). I know there is way to do it with java, but I would like to use PHP and do it server side.

Thanks.

Tags:

3

Answers


  1. 0

    [‘type’] is not trustable. An ok solution is http://php.net/manual/en/book.fileinfo.php

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  2. 0

    You have to check the mime type on server side with finfo_file or finfo_buffer.

    <?php
$finfo = finfo_open(FILEINFO_MIME_TYPE);
echo finfo_file($finfo, $filename);
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  3. 0

    Improving on @take answer, i use file_get_contents() as well 

     $finfo = new finfo(FILEINFO_MIME);
 print_r($finfo->buffer(file_get_contents($filename)));
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