# www/index.vuh

ad_page_contract {

    @param send_to The URL to redirect to

    @author Nuno Santos (nuno@arsdigita.com)
    @creation-date 2000-11-16
    @cvs-id $Id: index.vuh,v 1.1 2001/04/20 20:51:09 donb Exp $
} {
    send_to
}


# sometimes the foreign url is malformed, notable just "http"
if { $send_to == "http" } {
    ad_return_error "Redirected to HTTP only" "You were redirected to just \"http\"; the way that we do clickthroughs 
                     here requires your browser to be a little bit liberal about how it handles URLs.  
                     Your browser apparently isn't.  If you go back to the preceding page and View Source, 
                     you can probably tease out the target URL and go there manually with an Open command."
    return
}

# send the user to the link's destination url asap
ad_returnredirect $send_to



# user is off our hands now; time to log

set clickthrough_package_id [ad_conn package_id]

# get info about the parent package of this clickthrough instance
db_1row parent_package_sql "select sn2.object_id as parent_package_id, 
                                   site_node.url(sn2.node_id) as parent_package_url
                              from site_nodes sn1, site_nodes sn2 
                             where sn1.object_id = :clickthrough_package_id 
                               and sn1.parent_id = sn2.node_id"

# build the local url from the parent package base url and the relative url
append local_url $parent_package_url [ad_conn path_info]

# actually log the clickthrough (maybe cached in memory for performance)
clickthrough_log_click $local_url $send_to $parent_package_id