Support Configuring Authorities Granted

Author: jzheaux

web/src/main/java/org/springframework/security/web/authentication/preauth/PreAuthenticatedAuthenticationProvider.java

@@ -18,6 +18,7 @@
 
 import java.util.Collection;
 import java.util.LinkedHashSet;
+import java.util.List;
 import java.util.function.Supplier;
 
 import org.apache.commons.logging.Log;
@@ -62,7 +63,7 @@ public class PreAuthenticatedAuthenticationProvider implements AuthenticationPro
 
 	private UserDetailsChecker userDetailsChecker = new AccountStatusUserDetailsChecker();
 
-	private Supplier<Collection<GrantedAuthority>> grantedAuthoritySupplier;
+	private Supplier<Collection<GrantedAuthority>> grantedAuthoritySupplier = List::of;
 
 	private boolean throwExceptionWhenTokenRejected;