eu.emi.security.authn.x509.helpers.proxy.ProxySAMLExtension.java Source code

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Here is the source code for eu.emi.security.authn.x509.helpers.proxy.ProxySAMLExtension.java

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/*
 * Copyright (c) 2011-2012 ICM Uniwersytet Warszawski All rights reserved.
 * See LICENCE file for licensing information.
 *
 * Derived from the code copyrighted and licensed as follows:
 * 
 * Copyright (c) Members of the EGEE Collaboration. 2004.
 * See http://www.eu-egee.org/partners/ for details on the copyright
 * holders.
 * 
 * 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 eu.emi.security.authn.x509.helpers.proxy;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.cert.X509Certificate;

import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.DEROctetString;

import eu.emi.security.authn.x509.helpers.CertificateHelpers;

/**
 * A class for handling the SAML extension in the Certificate. OID: 1.3.6.1.4.1.3536.1.1.1.12
 * 
 * @author joni.hahkala@cern.ch
 * @author K. Benedyczak
 */
public class ProxySAMLExtension extends ASN1Object {
    /** The OID for the SAML assertion. */
    public static final String SAML_OID = "1.3.6.1.4.1.3536.1.1.1.12";

    /** The legacy OID for the SAML assertion. Not supported as format 
     * is flawed. */
    public static final String LEGACY_SAML_OID = "1.3.6.1.4.1.3536.1.1.1.10";

    /** The ASN.1 encoded contents of the extension. */
    private DEROctetString saml = null;

    /**
     * Generates a new SAMLExtension object form the byte array
     * 
     * @param bytes
     * @throws IOException
     */
    public ProxySAMLExtension(byte[] bytes) throws IOException {
        saml = (DEROctetString) ASN1Primitive.fromByteArray(bytes);

    }

    /**
     * Used to generate an instance form the SAML assertion in String
     * format.
     * 
     * @param samlString
     */
    public ProxySAMLExtension(String samlString) {
        try {
            this.saml = new DEROctetString(samlString.getBytes("UTF-8"));
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException("UTF-8 encoding is unsupported - JDK problem", e);
        }
    }

    /**
     * Returns the SAML extension form the certificate.
     * 
     * @return The SAML assertion extension object. In no SAML extension was
     *         found, null is returned.
     * @throws IOException
     *                 In case there is a problem parsing the certificate.
     */
    public static ProxySAMLExtension getInstance(X509Certificate cert) throws IOException {
        byte bytes[] = CertificateHelpers.getExtensionBytes(cert, ProxySAMLExtension.SAML_OID);

        if (bytes == null || bytes.length == 0)
            return null;

        return new ProxySAMLExtension(bytes);
    }

    /**
     * Used to get the SAML assertion in String format.
     * 
     * @return The SAML sertion in string format.
     */
    public String getSAML() {
        try {
            return new String(saml.getOctets(), "UTF-8");
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException("UTF-8 encoding is unsupported - JDK problem", e);
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public ASN1Primitive toASN1Primitive() {
        return saml.toASN1Primitive();
    }
}