MIME Type Custom Form Validator
I was recently working on methods to validate files uploaded by End Users and the usual recommendation of checking the file extension didn’t sit right with me, even more so when I found out that the .NET API ultimately just checks the File extension as well.
So the product a mornings work I’ve written a decent method of checking those upload files are what they say they are. In this case I created a Custom Sitecore WFFM Field Validator but its simple enough to port the code to custom web forms. Hopefully another dev will find this suitable as an alternative method.