ASP.NET MVC Alter Markup before Output

Question

Excuse my limited knoweldge here.

In the past I have used Steve Sanderson's method to HTML encode by default at runtime: http://blog.stevensanderson.com/2007/12/19/aspnet-mvc-prevent-xss-with-automatic-html-encoding/

I have a need to alter img src and a href attributes before they are spat out in the user's browser. There is a solution using JavaScript but this is not ideal for several reasons. Intercepting the compiler is not an option because of unnecessarily using Response.Write for trivial HTML.

Is there something I can do with HTTP modules or the view engine?

Any thoughts?

UPDATE: I do not need to HTML encode the attributes but I do have a need to change them.

Cheers.

Chris · Accepted Answer · 2010-03-15 11:43:36Z

3

Use a response filter. Works with any ASP.NET project, including MVC. Should work even if you're using a different view engine, as it intercepts at a lower level.

Here's an actual example that strips whitespace:

https://web.archive.org/web/20211029043851/https://www.4guysfromrolla.com/articles/120308-1.aspx

I've used this before to rewrite links before sending to the client, but I can't find the code at the moment.

answered Mar 15, 2010 at 11:43

Chris

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2 Comments

youwhut Over a year ago

Better words for what I want to do - "rewrite links". Cheers!

youwhut Over a year ago

A response filter was used to alter the markup before it was spat out. a HTTP module was used to kick off the response filter.

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