I would like to validate an uploaded image for a custom post type before upload

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I would like to check an image before uploading it to the server.
I need to check if it has a minimum width and height, 300dpi and only jpg.

I’m using the next function to invoke the upload process, except it invokes on every upload not for a certain post type.

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add_filter('wp_handle_upload_prefilter','tc_handle_upload_prefilter');

function mf_handle_upload_prefilter($file)
{
  // do checks and return error if fails

  return $file;
}

Does anyone know how to do this?
Can I maybe at an extra value to the $file parameter which I can use?
Or is there another way to do this?

ps. I has to be before the upload itself!

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1 comment

  1. The solution:

    add_filter('wp_handle_upload_prefilter','tc_handle_upload_prefilter');

function mf_handle_upload_prefilter($file)
{
  if(get_post_type($_REQUEST['post_id']) == 'post_type')
  {
     // do checks
  }

  return $file;
}