Sitecore Webforms for Marketers – Custom Field Validator MIME Type Sniffer


Update: I have since released this as a Sitecore Marketplace Module for download. Improvements I have made and the full source code are available in this recent blog post


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.

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