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Subject: Re: how to write a valve
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References: <B75CD08C73BD3543B97E4EF3964B7D70479122B5@CITESMBX1.ad.uillinois.edu>
From: =?UTF-8?Q?Andr=c3=a9_Warnier_=28tomcat=29?= <aw@ice-sa.com>
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Date: Fri, 14 Oct 2016 09:24:55 +0200
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On 13.10.2016 17:04, Campbell, Lance wrote:
> Tomcat 8.0.38
>
> In my Eclipse development environment when particular servlet requests are made I want to simulate going through Shibboleth prior to Tomcat handling the request.  I wanted to see if this will work.
>
> In Eclipse within each dynamic web application I would add a valve to the context.xml file.
>
> The valve would:
>
> 1)      Check the URL request.
>
> 2)      If the URL string matches a list then it will add particular name value pairs to the request.
>
> Example of a possible valve:
>
> <Valve className="my.valves.ShibbolethSimulationValve" />
>
>
> 1)      Can a valve actually identify a particular URL path?
>
> 2)      Can a valve add an attribute to the request prior to the servlet getting the request?
>
> 3)      If item #1 and #2 will work does anyone have some base code for a value that would get me started down the correct path?
>

Hi.

I think the best thing here is to point you to Google. If you search for 
"HttpServletRequest immutable", you'll get a whole bunch of useful links.
There is also example code there.

The basic thing here, is that the HttpServletRequest object that you get originally, is 
*immutable* (can't be modified, for example to add a header or add additional parameters).
So you have to "wrap" it with a HttpServletRequestWrapper, and then override some of the 
standard methods in that wrapper.


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