Unauthorized Page Redirect in Controller

Question

I am trying to create a small authentication on my force.com site so that I don't have any random person accessing the site/visualforce page unless they are currently logged into Salesforce. Also if they are logged into Salesforce their profile has to be a certain one to view the page or they will get sent to the standard unauthorized page.

I am getting an error in the controller telling me that Unauthorized page doesn't exist when it is a standard page in sf. Am I doing that wrong?

This is the part of the code throwing the error:

pagereference pageref = new pagereference(Unauthorized);
 pageref.setredirect(true);
 return pageref;

Here is my controller: public class GRIController {

public List<String> Calls;

    public GRIController(){
        //find authorized profile
        Boolean auth = Boolean.valueOf(ProfileCheck());

        if (auth == true)
        {
        //If profile is authorized query for data   
            Query();
            Refresh(); 
        }
        else
        {
            //Profile is not authorized send to unauthorized page
        pagereference pageref = new pagereference(Unauthorized);
           pageref.setredirect(true);
           return pageref;
        }
    }

    public void Query(){
    //Query for Data

        String soql = 'Select attendence, Contact.name, from Campaignmembers GROUP BY CampaignDate ORDER BY DSC';
        Calls = database.query(soql);
    }

    public static String GetProfileCheck(){
    String ReturnVal;
    String Pro;
        Pro = [Select Name from Profile where ProfileId = :User.ProfileId()];

        if( Pro == 'Chatter Free User' || Pro == 'System Administrator' || Pro == 'GRI'){
        ReturnVal = true;
        }
        else{
            ReturnVal = false;
        }
     return ReturnVal;

        }


}

Answer 1

PageReference pageref = new PageReference('/apex/Unauthorized');

Or better still

PageReference pageref = Page.Unauthorized;