FormFile file type validation

[Daniel Kies <da...@gmail.com>]

Does anyone know of a validator that can be plugged into the validator
framework that will check file types for FormFile?  This would be so a user
can't upload certain extensions like .exe and the application will catch it.

thanks.

Re: FormFile file type validation

[Laurie Harper <la...@holoweb.net>]

Daniel Kies wrote:
> Does anyone know of a validator that can be plugged into the validator
> framework that will check file types for FormFile?  This would be so a user
> can't upload certain extensions like .exe and the application will catch it..

There's nothing in the standard set of validation rules that would do 
this, so you'd have to implement your own validation rule. That 
shouldn't be too hard to do, whether based just on file name extension 
or using something more sophisticated like the lib David mentioned, but 
it does still require a custom extension to the validator framework.

L.


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RE: FormFile file type validation

["David G. Friedman" <hu...@ix.netcom.com>]

Daniel,

I remembered reading about a Java class which could do that using a file's "magic numbers."  I think this library was
the one I am thinking about.  Using it, you could determine the file information in your Form bean, I think.  It was
called "ffident — Java metadata extraction / file format identification library."

URL: http://schmidt.devlib.org/ffident/index.html

=== Example: ===
File file = new File("filename");
FormatDescription desc = FormatIdentification.identify(file);
if (desc == null) {
  System.out.println("Unknown format.");
} else {
  System.out.prinlnt("Format=" + desc.getShortName() + ", MIME type=" + desc.getMimeType());
}
=== ===

Warning: If LGPL licenses bother you, don't use it.

Regards,
David

-----Original Message-----
From: Daniel Kies [mailto:danielkies@gmail.com]
Sent: Monday, January 16, 2006 1:44 PM
To: user@struts.apache.org
Subject: FormFile file type validation


Does anyone know of a validator that can be plugged into the validator
framework that will check file types for FormFile?  This would be so a user
can't upload certain extensions like .exe and the application will catch it.

thanks.


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