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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF 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.apache.wss4j.dom.action;

import javax.security.auth.callback.CallbackHandler;

import org.apache.wss4j.common.SecurityActionToken;
import org.apache.wss4j.common.SignatureActionToken;
import org.apache.wss4j.common.crypto.Crypto;
import org.apache.wss4j.common.ext.WSPasswordCallback;
import org.apache.wss4j.common.ext.WSSecurityException;
import org.apache.wss4j.common.saml.SamlAssertionWrapper;
import org.apache.wss4j.common.saml.SAMLCallback;
import org.apache.wss4j.common.saml.SAMLUtil;
import org.apache.wss4j.dom.WSConstants;
import org.apache.wss4j.dom.handler.RequestData;
import org.apache.wss4j.dom.handler.WSHandler;
import org.apache.wss4j.dom.handler.WSHandlerConstants;
import org.apache.wss4j.dom.saml.WSSecSignatureSAML;

public class SAMLTokenSignedAction implements Action {

    private static final org.slf4j.Logger LOG =
        org.slf4j.LoggerFactory.getLogger(SAMLTokenSignedAction.class);

    public void execute(WSHandler handler, SecurityActionToken actionToken, RequestData reqData)
            throws WSSecurityException {
        Crypto crypto = null;

        // it is possible and legal that we do not have a signature crypto here - thus ignore the exception.
        // This is usually the case for the SAML option "sender vouches". In this case no user crypto is
        // required.
        try {
            crypto = handler.loadSignatureCrypto(reqData);
        } catch (Exception ex) {
            LOG.debug(ex.getMessage(), ex);
        }

        CallbackHandler samlCallbackHandler =
                handler.getCallbackHandler(
                    WSHandlerConstants.SAML_CALLBACK_CLASS,
                    WSHandlerConstants.SAML_CALLBACK_REF,
                    reqData
                );
        if (samlCallbackHandler == null) {
            throw new WSSecurityException(
                WSSecurityException.ErrorCode.FAILURE,
                "noSAMLCallbackHandler"
            );
        }
        SAMLCallback samlCallback = new SAMLCallback();
        SAMLUtil.doSAMLCallback(samlCallbackHandler, samlCallback);

        SamlAssertionWrapper samlAssertion = new SamlAssertionWrapper(samlCallback);
        if (samlCallback.isSignAssertion()) {
            samlAssertion.signAssertion(
                samlCallback.getIssuerKeyName(),
                samlCallback.getIssuerKeyPassword(),
                samlCallback.getIssuerCrypto(),
                samlCallback.isSendKeyValue(),
                samlCallback.getCanonicalizationAlgorithm(),
                samlCallback.getSignatureAlgorithm(),
                samlCallback.getSignatureDigestAlgorithm()
            );
        }
        WSSecSignatureSAML wsSign = new WSSecSignatureSAML(reqData.getSecHeader());
        wsSign.setIdAllocator(reqData.getWssConfig().getIdAllocator());
        wsSign.setAddInclusivePrefixes(reqData.isAddInclusivePrefixes());
        wsSign.setWsDocInfo(reqData.getWsDocInfo());
        wsSign.setExpandXopInclude(reqData.isExpandXopInclude());
        wsSign.setSignatureProvider(reqData.getSignatureProvider());

        CallbackHandler callbackHandler =
            handler.getPasswordCallbackHandler(reqData);

        SignatureActionToken signatureToken = null;
        if (actionToken instanceof SignatureActionToken) {
            signatureToken = (SignatureActionToken)actionToken;
        }
        if (signatureToken == null) {
            signatureToken = reqData.getSignatureToken();
        }

        WSPasswordCallback passwordCallback =
            handler.getPasswordCB(signatureToken.getUser(), WSConstants.ST_SIGNED, callbackHandler, reqData);
        wsSign.setUserInfo(signatureToken.getUser(), passwordCallback.getPassword());

        if (signatureToken.getKeyIdentifierId() != 0) {
            wsSign.setKeyIdentifierType(signatureToken.getKeyIdentifierId());
        }
        if (signatureToken.getSignatureAlgorithm() != null) {
            wsSign.setSignatureAlgorithm(signatureToken.getSignatureAlgorithm());
        }
        if (signatureToken.getDigestAlgorithm() != null) {
            wsSign.setDigestAlgo(signatureToken.getDigestAlgorithm());
        }
        if (signatureToken.getC14nAlgorithm() != null) {
            wsSign.setSigCanonicalization(signatureToken.getC14nAlgorithm());
        }
        if (signatureToken.getKeyInfoElement() != null) {
            wsSign.setCustomKeyInfoElement(signatureToken.getKeyInfoElement());
        }

        if (!signatureToken.getParts().isEmpty()) {
            wsSign.getParts().addAll(signatureToken.getParts());
        }

        try {
            wsSign.build(
                    crypto,
                    samlAssertion,
                    samlCallback.getIssuerCrypto(),
                    samlCallback.getIssuerKeyName(),
                    samlCallback.getIssuerKeyPassword());

            reqData.getSignatureValues().add(wsSign.getSignatureValue());
            byte[] signatureValue = samlAssertion.getSignatureValue();
            if (signatureValue != null) {
                reqData.getSignatureValues().add(signatureValue);
            }
        } catch (WSSecurityException e) {
            throw new WSSecurityException(WSSecurityException.ErrorCode.FAILURE, e, "empty",
                                          new Object[] {"Error when signing the SAML token: "});
        }
    }

}