This function check the yahoo OAuth 1.0 authentification (http://developer.yahoo.com/oauth/guide/oauth-accesstoken.html), if success login the user or register him. Typically, the website open a popup to an url like /authentication/yahoo_oauth1authorization/ that will show to the end user the yahoo autorization dialog. after the user accept to share his profile, the url ”oauth_callback” (by default /authentication/yahoo_oauth1callback/) that contain this function (<#yahoo_oauth1callback>) will be called. The function itself will be responsible to login or create (and login) the user and the template of this function will be responsible to close the popup and reload the parent document

<#{yahoo_oauth1callback oauth_consumer_key="..." oauth_signature="..." oauth_callback="...">
  <#{template>
    <script type="text/javascript">
    //<![CDATA[
    (function(){
      window.opener.location = window.opener.location;
      window.close();
    })();
    //]]>
    </script>
  <#}template>    
<#}yahoo_oauth1callback>