/**
 * 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.message;

import org.apache.wss4j.common.util.SOAPUtil;
import org.apache.wss4j.dom.WSConstants;
import org.apache.wss4j.dom.common.CustomHandler;

import org.apache.wss4j.dom.common.UsernamePasswordCallbackHandler;
import org.apache.wss4j.dom.engine.WSSConfig;
import org.apache.wss4j.dom.engine.WSSecurityEngine;
import org.apache.wss4j.dom.engine.WSSecurityEngineResult;
import org.apache.wss4j.common.crypto.Crypto;
import org.apache.wss4j.common.crypto.CryptoFactory;
import org.apache.wss4j.common.ext.WSSecurityException;
import org.apache.wss4j.common.util.UsernameTokenUtil;
import org.apache.wss4j.common.util.XMLUtils;
import org.apache.wss4j.dom.handler.HandlerAction;
import org.apache.wss4j.dom.handler.RequestData;
import org.apache.wss4j.dom.handler.WSHandlerConstants;
import org.apache.wss4j.dom.handler.WSHandlerResult;

import org.junit.jupiter.api.Test;
import org.w3c.dom.Document;

import javax.security.auth.callback.CallbackHandler;

import java.util.Collections;

import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.junit.jupiter.api.Assertions.fail;

/**
 * WS-Security Test Case for UsernameToken Key Derivation, as defined in the
 * UsernameTokenProfile 1.1 specification. The derived keys are used for signature.
 * Note that this functionality is different to the UTDerivedKeyTest test case,
 * which uses the derived key in conjunction with wsc:DerivedKeyToken. It's also
 * different to UTWseSignatureTest, which derives a key for signature using a
 * non-standard implementation.
 */
public class UTSignatureTest {
    private static final org.slf4j.Logger LOG =
        org.slf4j.LoggerFactory.getLogger(UTSignatureTest.class);
    private CallbackHandler callbackHandler = new UsernamePasswordCallbackHandler();
    private Crypto crypto;

    public UTSignatureTest() throws Exception {
        crypto = CryptoFactory.getInstance();
    }

    /**
     * Test using a UsernameToken derived key for signing a SOAP body
     */
    @Test
    public void testSignature() throws Exception {
        Document doc = SOAPUtil.toSOAPPart(SOAPUtil.SAMPLE_SOAP_MSG);
        WSSecHeader secHeader = new WSSecHeader(doc);
        secHeader.insertSecurityHeader();

        WSSecUsernameToken builder = new WSSecUsernameToken(secHeader);
        builder.setUserInfo("bob", "security");
        builder.addDerivedKey(true, 1000);
        byte[] salt = UsernameTokenUtil.generateSalt(true);
        builder.prepare(salt);

        WSSecSignature sign = new WSSecSignature(secHeader);
        sign.setCustomTokenValueType(WSConstants.USERNAMETOKEN_NS + "#UsernameToken");
        sign.setCustomTokenId(builder.getId());
        sign.setSecretKey(builder.getDerivedKey(salt));
        sign.setKeyIdentifierType(WSConstants.CUSTOM_SYMM_SIGNING);
        sign.setSignatureAlgorithm(WSConstants.HMAC_SHA1);

        Document signedDoc = sign.build(null);
        builder.prependToHeader();

        String outputString =
            XMLUtils.prettyDocumentToString(signedDoc);
        assertTrue(outputString.contains("wsse:Username"));
        assertFalse(outputString.contains("wsse:Password"));
        assertTrue(outputString.contains("wsse11:Salt"));
        assertTrue(outputString.contains("wsse11:Iteration"));
        if (LOG.isDebugEnabled()) {
            LOG.debug(outputString);
        }

        WSHandlerResult results = verify(signedDoc);
        WSSecurityEngineResult actionResult =
            results.getActionResults().get(WSConstants.UT_SIGN).get(0);
        java.security.Principal principal =
            (java.security.Principal) actionResult.get(WSSecurityEngineResult.TAG_PRINCIPAL);
        assertTrue(principal.getName().contains("bob"));

        try {
            verify(signedDoc, false);
            fail("Failure expected on deriving keys from a UsernameToken not allowed");
        } catch (WSSecurityException ex) {
            assertTrue(ex.getErrorCode() == WSSecurityException.ErrorCode.FAILED_AUTHENTICATION);
        }
    }


    /**
     * Test using a UsernameToken derived key for signing a SOAP body. In this test the
     * user is "colm" rather than "bob", and so signature verification should fail.
     */
    @Test
    public void testBadUserSignature() throws Exception {
        Document doc = SOAPUtil.toSOAPPart(SOAPUtil.SAMPLE_SOAP_MSG);
        WSSecHeader secHeader = new WSSecHeader(doc);
        secHeader.insertSecurityHeader();

        WSSecUsernameToken builder = new WSSecUsernameToken(secHeader);
        builder.setUserInfo("colm", "security");
        builder.addDerivedKey(true, 1000);
        byte[] salt = UsernameTokenUtil.generateSalt(true);
        builder.prepare(salt);

        WSSecSignature sign = new WSSecSignature(secHeader);
        sign.setCustomTokenValueType(WSConstants.USERNAMETOKEN_NS + "#UsernameToken");
        sign.setCustomTokenId(builder.getId());
        sign.setSecretKey(builder.getDerivedKey(salt));
        sign.setKeyIdentifierType(WSConstants.CUSTOM_SYMM_SIGNING);
        sign.setSignatureAlgorithm(WSConstants.HMAC_SHA1);

        Document signedDoc = sign.build(null);
        builder.prependToHeader();

        String outputString =
            XMLUtils.prettyDocumentToString(signedDoc);
        if (LOG.isDebugEnabled()) {
            LOG.debug(outputString);
        }

        try {
            verify(signedDoc);
            fail("Failure expected on a bad derived signature");
        } catch (WSSecurityException ex) {
            assertTrue(ex.getErrorCode() == WSSecurityException.ErrorCode.FAILED_AUTHENTICATION);
            // expected
        }
    }

    /**
     * Test using a UsernameToken derived key for signing a SOAP body via WSHandler
     */
    @Test
    public void testHandlerSignature() throws Exception {

        final WSSConfig cfg = WSSConfig.getNewInstance();
        RequestData reqData = new RequestData();
        reqData.setWssConfig(cfg);
        java.util.Map<String, Object> messageContext = new java.util.TreeMap<>();
        messageContext.put(WSHandlerConstants.PW_CALLBACK_REF, callbackHandler);
        reqData.setMsgContext(messageContext);
        reqData.setUsername("bob");

        Document doc = SOAPUtil.toSOAPPart(SOAPUtil.SAMPLE_SOAP_MSG);
        CustomHandler handler = new CustomHandler();
        HandlerAction action = new HandlerAction(WSConstants.UT_SIGN);
        handler.send(
            doc,
            reqData,
            Collections.singletonList(action),
            true
        );

        String outputString =
            XMLUtils.prettyDocumentToString(doc);
        assertTrue(outputString.contains("wsse:Username"));
        assertFalse(outputString.contains("wsse:Password"));
        assertTrue(outputString.contains("wsse11:Salt"));
        assertTrue(outputString.contains("wsse11:Iteration"));
        if (LOG.isDebugEnabled()) {
            LOG.debug(outputString);
        }

        WSHandlerResult results = verify(doc);
        WSSecurityEngineResult actionResult =
            results.getActionResults().get(WSConstants.UT_SIGN).get(0);
        java.security.Principal principal =
            (java.security.Principal) actionResult.get(WSSecurityEngineResult.TAG_PRINCIPAL);
        assertTrue(principal.getName().contains("bob"));
    }

    /**
     * Test using a UsernameToken derived key for signing a SOAP body via WSHandler
     */
    @Test
    public void testHandlerSignatureIterations() throws Exception {

        final WSSConfig cfg = WSSConfig.getNewInstance();
        RequestData reqData = new RequestData();
        reqData.setWssConfig(cfg);
        java.util.Map<String, Object> messageContext = new java.util.TreeMap<>();
        messageContext.put(WSHandlerConstants.PW_CALLBACK_REF, callbackHandler);
        messageContext.put(WSHandlerConstants.DERIVED_KEY_ITERATIONS, "1234");
        reqData.setMsgContext(messageContext);
        reqData.setUsername("bob");

        Document doc = SOAPUtil.toSOAPPart(SOAPUtil.SAMPLE_SOAP_MSG);
        CustomHandler handler = new CustomHandler();
        HandlerAction action = new HandlerAction(WSConstants.UT_SIGN);
        handler.send(
            doc,
            reqData,
            Collections.singletonList(action),
            true
        );

        String outputString =
            XMLUtils.prettyDocumentToString(doc);
        assertTrue(outputString.contains("wsse:Username"));
        assertFalse(outputString.contains("wsse:Password"));
        assertTrue(outputString.contains("wsse11:Salt"));
        assertTrue(outputString.contains("wsse11:Iteration"));
        assertTrue(outputString.contains("1234"));
        if (LOG.isDebugEnabled()) {
            LOG.debug(outputString);
        }

        WSHandlerResult results = verify(doc);
        WSSecurityEngineResult actionResult =
            results.getActionResults().get(WSConstants.UT_SIGN).get(0);
        java.security.Principal principal =
            (java.security.Principal) actionResult.get(WSSecurityEngineResult.TAG_PRINCIPAL);
        assertTrue(principal.getName().contains("bob"));
    }

    /**
     * Verifies the soap envelope.
     *
     * @param doc soap envelope
     * @throws Exception Thrown when there is a problem in verification
     */
    private WSHandlerResult verify(Document doc) throws Exception {
        return verify(doc, true);
    }

    private WSHandlerResult verify(
        Document doc,
        boolean allowUsernameTokenDerivedKeys
    ) throws Exception {
        WSSecurityEngine secEngine = new WSSecurityEngine();

        RequestData requestData = new RequestData();
        requestData.setAllowUsernameTokenNoPassword(allowUsernameTokenDerivedKeys);
        requestData.setCallbackHandler(callbackHandler);
        requestData.setSigVerCrypto(crypto);
        requestData.setDecCrypto(crypto);

        return secEngine.processSecurityHeader(doc, requestData);
    }

}