I am new to PHP. I want to use SSO to login to my Limesurvey. I already have a login page and a web service(.asmx),
When the user go to /admin , rediecting to my login page . after successing , I get the parameter RID and then redirect to /admin?RID=numbers .
Passing RID to the web service can get user infomation.

I want to write some code to auto redirect when user need to login , and get infomation via RID and create account in limesurvey.
Where should I rewrite?
is it in Authwebserver ? or I should write a new auth plugin? thanks.

You can start by copy/paste AuthWebserver, and rename it before put in plugins directory.

Else : next time you update : your code are deleted.

Thank you Denis ! I am now facing another problem. How can I get the RID parameter and pass it to Authwebserver after user logged in.

My thinking is adding parsing rule to router ? Is it correct?

But where is the router code? I don't know which file to edit.

Or is there some better solution? thanks

Did you auth webservice have some API ????

Else to get a GET parameters :
$rid=isset($_GET) ? $_GET : null; (or with Yii : App()->getRequest()->getQuery('RID'); )

BUT : if you don't knwo how to do this .... i can not help a lot.

Do some test, show some code, etc .... and if you need a PHP dev : hire a pHP dev

Thanks a lot. I have successed.