Set Mime_type validation in Symfony

Answer 1

You seem to be using the API incorrectly. The signature of sfForm::setValidator() is here.

However, here's a simple way to set a file validator that allows only web images to be uploaded:

$this->validatorSchema['my_file'] = new sfValidatorFile(array(
    'mime_types' => 'web_images'
), array(
    'invalid'    => 'Invalid file.',
    'required'   => 'Select a file to upload.',
    'mime_types' => 'The file must be of JPEG, PNG or GIF format.'
));

The 'web_images' category includes the following MIME types:

image/jpeg
image/pjpeg
image/png
image/x-png
image/gif

If you want to explicitly define the MIME types to accept, replace 'web_images' with an array of types like this:

'mime_types' => array(
    'image/jpeg',
    'image/pjpeg',
    'image/png',
    'image/x-png',
    'image/gif'
)

Answer 2

I tried using BMP Images but it's not showing any invalid message. I am using web_images.

Answer 3

BMP aren't web images

Answer 4

There is a way to constraint file selection from upload in a browser.
The drawback is it uses flash to select file, and limit support to users having flash player installed. The advantage is flash give you much more control over upload (parrallel upload, progression, errors, controle files extension allowed to select, etc.).

The component I use for this is swfupload

EDIT : this does not exempt from doing server-side control on uploaded files, but used in combination it offers a similar security leel and a much better user experience (errors can happens before a long-running upload start)