/*
 * Copyright  2003-2004 The Apache Software Foundation.
 *
 *  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 org.apache.ws.security.processor;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.ws.security.WSConstants;
import org.apache.ws.security.WSDocInfo;
import org.apache.ws.security.WSSConfig;
import org.apache.ws.security.WSSecurityEngineResult;
import org.apache.ws.security.WSSecurityException;
import org.apache.ws.security.components.crypto.Crypto;
import org.apache.ws.security.saml.SAMLUtil;
import org.opensaml.SAMLAssertion;
import org.opensaml.SAMLException;
import org.w3c.dom.Element;

import javax.security.auth.callback.CallbackHandler;
import java.util.Vector;

public class SAMLTokenProcessor implements Processor {
    private static final Log log = LogFactory.getLog(SAMLTokenProcessor.class.getName());
    
    private String id;
    private Element samlTokenElement;

    public void handleToken(
        Element elem, 
        Crypto crypto,
        Crypto decCrypto, 
        CallbackHandler cb, 
        WSDocInfo wsDocInfo, 
        Vector returnResults, 
        WSSConfig wsc
    ) throws WSSecurityException {
        if (log.isDebugEnabled()) {
            log.debug("Found SAML Assertion element");
        }
        SAMLAssertion assertion = handleSAMLToken((Element) elem);
        // validate the signature of the token against the Signature Crypto
        if(assertion.isSigned()){
            SAMLUtil.validateSignature(assertion, crypto);
        }

        this.id = assertion.getId();
        wsDocInfo.setAssertion((Element) elem);
        WSSecurityEngineResult wsSecurityEngineResult = new WSSecurityEngineResult(
                WSConstants.ST_UNSIGNED, assertion);
        returnResults.add(0, wsSecurityEngineResult);
        //set the SAML version
        wsSecurityEngineResult.put(WSConstants.SAML_VERSION, WSConstants.SAML_NS);
        // Adding a timeStamp element for validating the SAMLToken
        returnResults.add(0, new WSSecurityEngineResult(WSConstants.SAML_TIMESTAMP, SAMLUtil.getTimestampForSAMLAssertion(elem)));
        // Adding the token issuer name
        wsSecurityEngineResult.put(WSConstants.SAML_ISSUER_NAME, assertion.getIssuer());
        // Adding the set of attributes included in a SAML assertion
        wsSecurityEngineResult.put(WSConstants.SAML_CLAIM_SET, SAMLUtil.getClaims(assertion));
        // set whether the SAML assertion is signed or not
        wsSecurityEngineResult.put(WSConstants.SAML_TOKEN_SIGNED, Boolean.valueOf(assertion.isSigned()));

        this.samlTokenElement = elem;

    }

    public SAMLAssertion handleSAMLToken(Element token) throws WSSecurityException {
        boolean result = false;
        SAMLAssertion assertion = null;
        try {
            assertion = new SAMLAssertion(token);
            result = true;
            if (log.isDebugEnabled()) {
                log.debug("SAML Assertion issuer " + assertion.getIssuer());
            }
        } catch (SAMLException e) {
            throw new WSSecurityException(
                WSSecurityException.FAILURE, "invalidSAMLSecurity", null, e
            );
        }
        if (!result) {
            throw new WSSecurityException(WSSecurityException.FAILED_AUTHENTICATION);
        }
        return assertion;
    }

    /**
     * Return the id of the SAML token
     */
    public String getId() {
        return this.id;
    }

    public Element getSamlTokenElement() {
        return samlTokenElement;
    }

}
