/**
 * Copyright 2007-2016, Kaazing Corporation. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.kaazing.gateway.resource.address.http;

import java.security.Principal;
import java.util.Collection;
import java.util.Set;

import javax.security.auth.Subject;

import org.kaazing.gateway.resource.address.IdentityResolver;

/**
 * Identity resolver implementation for HTTP
 *
 */
public class HttpIdentityResolver extends IdentityResolver {

    private Collection<Class<? extends Principal>> userPrincipalClasses;

    public HttpIdentityResolver(Collection<Class<? extends Principal>> userPrincipalClasses) {
        this.userPrincipalClasses = userPrincipalClasses;
    }

    @Override
    public String resolve(Subject subject) {
        Set<? extends Principal> principals;

        principals = subject.getPrincipals(userPrincipalClasses.iterator().next());

        if (principals != null && !principals.isEmpty()) {
            Principal principal = principals.iterator().next();
            return principal.getName();
        }

        return null;
    }

}