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/*
 * Licensed to the University Corporation for Advanced Internet Development, 
 * Inc. (UCAID) under one or more contributor license agreements.  See the 
 * NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The UCAID 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
 *
 *    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.opensaml.ws.security;

import java.security.cert.X509Certificate;
import java.util.Arrays;

import javax.servlet.ServletRequest;

import org.opensaml.xml.security.credential.UsageType;
import org.opensaml.xml.security.x509.BasicX509Credential;
import org.opensaml.xml.security.x509.X509Credential;

/**
 * An adapter that exposes the X.509 certificates contained in the servlet request attribute.
 */
public class ServletRequestX509CredentialAdapter extends BasicX509Credential implements X509Credential {

    /** Servlet request attribute to pull certificate info from. */
    public static final String X509_CERT_REQUEST_ATTRIBUTE = "javax.servlet.request.X509Certificate";

    /**
     * Constructor.
     *
     * @param request the servlet request
     */
    public ServletRequestX509CredentialAdapter(ServletRequest request) {
        X509Certificate[] chain = (X509Certificate[]) request.getAttribute(X509_CERT_REQUEST_ATTRIBUTE);
        if (chain == null || chain.length == 0) {
            throw new IllegalArgumentException("Servlet request does not contain X.509 certificates in attribute "
                    + X509_CERT_REQUEST_ATTRIBUTE);
        }

        setEntityCertificate(chain[0]);
        setEntityCertificateChain(Arrays.asList(chain));
        setUsageType(UsageType.SIGNING);
    }
}