Forms authentication

Hello gurus,

I’m quite new to BizTalk Server. The problem I’m trying to solve is something like that:

I have an internal web-site onto which users can logon, then they go to report section of portal, click Export button and the report is exported to Excel. What I need to do is to automate that process via BizTalk. So, I need to authorize users somehow as far as forms authentication is ised, then maybe send some HTTP request to get generated file. Is this a BizTalk-possible task? What should I use: SSO or only HTTP Adapter? Any advice is really appreciated.