Seraph SSO configuration using target url that contains query parameters

We have an SSO solution that uses Shibboleth SSO for SSO authentication to a Confluence wiki site.  We've configured Seraph (login.url and link.login.url) to redirect through Shibboleth as follows:

<init-param>
  <param-name>login.url</param-name>          
  <param-value>https://<sp domain>/Shibboleth.sso/Login?target=https://<wiki domain>/wiki?os_destination=${originalurl}</param-value>  
</init-param>

<init-param>     
  <param-name>link.login.url</param-name>
  <param-value>https://<sp domain>/Shibboleth.sso/Login?target=https://<wiki domain>/wiki?os_destination=${originalurl}</param-value>   
</init-param>

 

The problem is, the originalurl contains query parameters (e.g https://<wiki domain>/wiki/pages/viewpage.action?title=Home&spaceKey=Space).  When this is sent back to the SP, only the ${originalurl} portion is URL encoded.  Once the SP decodes the target, the 2nd originalulr query parameter (spaceKey in this example) is interpret as the target's query parameters.

 

It seems as if i need to url encode the entire target after the originalurl has been encoded (i.e dual encode the originalurl) so original url can survive the SP decode.

 

How can i handle origianlurl's that contain query parameters?

 

Thanks

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