/**
 * 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.rendering.xslt;

import java.util.Collections;
import java.util.Map;
import java.util.Properties;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apereo.portal.security.IdentitySwapperManager;
import org.apereo.portal.utils.cache.CacheKey;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;

/**
 * Injects a parameter marking if the current user is impersonating another using the ID Swapper
 *
 */
public class UserImpersonationTransformerConfigurationSource
        implements TransformerConfigurationSource {
    protected final Logger logger = LoggerFactory.getLogger(this.getClass());

    private String userImpersonatingParameter = "userImpersonating";
    private IdentitySwapperManager identitySwapperManager;

    @Autowired
    public void setIdentitySwapperManager(IdentitySwapperManager identitySwapperManager) {
        this.identitySwapperManager = identitySwapperManager;
    }

    public void setUserImpersonatingParameter(String userImpersonatingParameter) {
        this.userImpersonatingParameter = userImpersonatingParameter;
    }

    @Override
    public CacheKey getCacheKey(HttpServletRequest request, HttpServletResponse response) {
        final boolean impersonating = this.identitySwapperManager.isImpersonating(request);

        return CacheKey.build(
                UserImpersonationTransformerConfigurationSource.class.getName(),
                userImpersonatingParameter,
                impersonating);
    }

    @Override
    public Properties getOutputProperties(
            HttpServletRequest request, HttpServletResponse response) {
        return null;
    }

    @Override
    public Map<String, Object> getParameters(
            HttpServletRequest request, HttpServletResponse response) {
        final boolean impersonating = this.identitySwapperManager.isImpersonating(request);

        final Map<String, Object> parameters =
                Collections.<String, Object>singletonMap(userImpersonatingParameter, impersonating);
        this.logger.debug("Returning transformer parameters: {}", parameters);

        return parameters;
    }
}