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/*
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * Copyright (C) 2022 Nordix Foundation. 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.
 * ============LICENSE_END=========================================================
 */

package org.openecomp.sdc.common.filters;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang3.StringUtils;

public abstract class ContentSecurityPolicyHeaderFilterAbstract implements Filter {

    @Override
    public void init(final FilterConfig filterConfig) throws ServletException {
        // nothing to override
    }

    @Override
    public void doFilter(final ServletRequest request, final ServletResponse response, final FilterChain chain) throws IOException, ServletException {
        final HttpServletResponse httpServletResponse = (HttpServletResponse) response;
        final String permittedAncestors = getPermittedAncestors();
        httpServletResponse.setHeader("Content-Security-Policy",
            "frame-ancestors 'self' " + (StringUtils.isNotBlank(permittedAncestors) ? permittedAncestors : ""));
        chain.doFilter(request, httpServletResponse);
    }

    @Override
    public void destroy() {
        // nothing to override
    }

    protected abstract String getPermittedAncestors();
}