/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * licenses this file to you 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 the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>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.apereo.portal.security.provider.cas;

/**
 * Interface implemented by CAS security contexts. CAS security contexts are capable of getting a
 * token - a proxy ticket - suitable for accessing a given String-identified service. This interface
 * declares a method for getting such a token.
 *
 * <p>This interface evolved from edu.yale.its.tp.portal.security.IYaleCasContext as distributed in
 * the Yale uPortal CAS security provider distribution version 3.0.0.
 *
 */
public interface ICasSecurityContext {
    /** Authentication type for CAS authentication */
    public static final int CAS_AUTHTYPE = 0x1701;

    /**
     * Get a proxy ticket for a given target. Implementations should return null if no PGTIOU or PGT
     * is available by which to obtain a proxy ticket. Implementations should throw a
     * CASProxyTicketAcquisitionException if an error occurs during an attempt to obtain a PGT. In
     * particular, inability to contact the CAS server and expiration of the underlying PGT should
     * result in a CASProxyTicketAcquisitionException.
     *
     * @param target - URL for which a proxy ticket is desired.
     * @return a valid proxy ticket for the target, or null.
     * @throws CasProxyTicketAcquisitionException - when unable to obtain Proxy Ticket.
     */
    public String getCasServiceToken(String target) throws CasProxyTicketAcquisitionException;
}