/*
 * 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 wssec;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import org.apache.axis.Message;
import org.apache.axis.MessageContext;
import org.apache.axis.client.AxisClient;
import org.apache.axis.configuration.NullProvider;
import org.apache.axis.message.SOAPEnvelope;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.ws.security.WSConstants;
import org.apache.ws.security.WSSecurityException;
import org.apache.ws.security.WSPasswordCallback;
import org.apache.ws.security.WSSecurityEngine;
import org.apache.ws.security.WSEncryptionPart;
import org.apache.ws.security.WSSConfig;
import org.apache.ws.security.components.crypto.Crypto;
import org.apache.ws.security.components.crypto.CryptoFactory;
import org.apache.ws.security.message.WSSecDKEncrypt;
import org.apache.ws.security.message.WSSecDKSign;
import org.apache.ws.security.message.WSSecEncrypt;
import org.apache.ws.security.message.WSSecHeader;
import org.apache.ws.security.message.WSSecSignature;
import org.apache.ws.security.message.WSSecUsernameToken;
import org.apache.ws.security.message.token.UsernameToken;
import org.apache.ws.security.processor.Processor;
import org.apache.ws.security.processor.UsernameTokenProcessor;
import org.apache.ws.security.util.WSSecurityUtil;
import org.apache.xml.security.signature.XMLSignature;
import org.w3c.dom.Document;

import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.UnsupportedCallbackException;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;

import java.util.Vector;

/**
 * WS-Security Test Case for UsernameToken Key Derivation, as defined in the 
 * UsernameTokenProfile 1.1 specification. Note that the processing of UsernameTokens
 * with derived keys is not yet supported.
 */
public class TestWSSecurityUTDK extends TestCase implements CallbackHandler {
    private static Log log = LogFactory.getLog(TestWSSecurityUTDK.class);
    static final String soapMsg = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
            "<soapenv:Envelope xmlns:soapenv=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\">" +
            "   <soapenv:Body>" +
            "      <ns1:testMethod xmlns:ns1=\"uri:LogTestService2\"></ns1:testMethod>" +
            "   </soapenv:Body>" +
            "</soapenv:Envelope>";

    static final WSSecurityEngine secEngine = new WSSecurityEngine();
    static final Crypto crypto = CryptoFactory.getInstance();
    MessageContext msgContext;
    SOAPEnvelope unsignedEnvelope;

    /**
     * TestWSSecurity constructor
     * <p/>
     * 
     * @param name name of the test
     */
    public TestWSSecurityUTDK(String name) {
        super(name);
    }

    /**
     * JUnit suite
     * <p/>
     * 
     * @return a junit test suite
     */
    public static Test suite() {
        return new TestSuite(TestWSSecurityUTDK.class);
    }

    /**
     * Main method
     * <p/>
     * 
     * @param args command line args
     */
    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }

    /**
     * Setup method
     * <p/>
     * 
     * @throws Exception Thrown when there is a problem in setup
     */
    protected void setUp() throws Exception {
        AxisClient tmpEngine = new AxisClient(new NullProvider());
        msgContext = new MessageContext(tmpEngine);
        unsignedEnvelope = getSOAPEnvelope();
    }

    /**
     * Constructs a soap envelope
     * <p/>
     * 
     * @return soap envelope
     * @throws java.lang.Exception if there is any problem constructing the soap envelope
     */
    protected SOAPEnvelope getSOAPEnvelope() throws Exception {
        InputStream in = new ByteArrayInputStream(soapMsg.getBytes());
        Message msg = new Message(in);
        msg.setMessageContext(msgContext);
        return msg.getSOAPEnvelope();
    }

    /**
     * Unit test for the UsernameToken derived key functionality 
     */
    public void testUsernameTokenUnit() throws Exception {
        Document doc = unsignedEnvelope.getAsDocument();
        WSSecHeader secHeader = new WSSecHeader();
        secHeader.insertSecurityHeader(doc);
        
        UsernameToken usernameToken = new UsernameToken(true, doc, null);
        usernameToken.setName("bob");
        
        byte[] salt = usernameToken.addSalt(doc, null, false);
        assertTrue(salt.length == 16);
        assertTrue(salt[15] == 0x02);
        byte[] utSalt = usernameToken.getSalt();
        assertTrue(salt.length == utSalt.length);
        for (int i = 0; i < salt.length; i++) {
            assertTrue(salt[i] == utSalt[i]);
        }
        
        usernameToken.addIteration(doc, 500);
        assertTrue(usernameToken.getIteration() == 500);
        
        WSSecurityUtil.prependChildElement(
            doc, secHeader.getSecurityHeader(), usernameToken.getElement(), false
        );
        
        String outputString = 
            org.apache.ws.security.util.XMLUtils.PrettyDocumentToString(doc);
        assertTrue(outputString.indexOf("wsse:Username") != -1);
        assertTrue(outputString.indexOf("wsse:Password") == -1);
        assertTrue(outputString.indexOf("wsse11:Salt") != -1);
        assertTrue(outputString.indexOf("wsse11:Iteration") != -1);
        
        byte[] derivedKey = UsernameToken.generateDerivedKey("security", salt, 500);
        assertTrue(derivedKey.length == 20);
        
    }
    

    /**
     * Test using a UsernameToken derived key for encrypting a SOAP body
     */
    public void testDerivedKeyEncryption() throws Exception {
        Document doc = unsignedEnvelope.getAsDocument();
        WSSecHeader secHeader = new WSSecHeader();
        secHeader.insertSecurityHeader(doc);
        
        WSSecUsernameToken builder = new WSSecUsernameToken();
        builder.setUserInfo("bob", "security");
        builder.addDerivedKey(false, null, 1000);
        builder.prepare(doc);
        
        byte[] derivedKey = builder.getDerivedKey();
        assertTrue(derivedKey.length == 20);
        
        String tokenIdentifier = builder.getId();
        
        //
        // Derived key encryption
        //
        WSSecDKEncrypt encrBuilder = new WSSecDKEncrypt();
        encrBuilder.setSymmetricEncAlgorithm(WSConstants.AES_128);
        encrBuilder.setExternalKey(derivedKey, tokenIdentifier);
        Document encryptedDoc = encrBuilder.build(doc, secHeader);
        
        builder.prependToHeader(secHeader);
        
        String outputString = 
            org.apache.ws.security.util.XMLUtils.PrettyDocumentToString(encryptedDoc);
        assertTrue(outputString.indexOf("wsse:Username") != -1);
        assertTrue(outputString.indexOf("wsse:Password") == -1);
        assertTrue(outputString.indexOf("wsse11:Salt") != -1);
        assertTrue(outputString.indexOf("wsse11:Iteration") != -1);
        if (log.isDebugEnabled()) {
            log.debug(outputString);
        }
        
        // verify(encryptedDoc);
    }
    
    /**
     * Test using a UsernameToken derived key for signing a SOAP body
     */
    public void testDerivedKeySignature() throws Exception {
        Document doc = unsignedEnvelope.getAsDocument();
        WSSecHeader secHeader = new WSSecHeader();
        secHeader.insertSecurityHeader(doc);
        
        WSSecUsernameToken builder = new WSSecUsernameToken();
        builder.setUserInfo("bob", "security");
        builder.addDerivedKey(true, null, 1000);
        builder.prepare(doc);
        
        byte[] derivedKey = builder.getDerivedKey();
        assertTrue(derivedKey.length == 20);
        
        String tokenIdentifier = builder.getId();
        
        //
        // Derived key encryption
        //
        WSSecDKSign sigBuilder = new WSSecDKSign();
        sigBuilder.setExternalKey(derivedKey, tokenIdentifier);
        sigBuilder.setSignatureAlgorithm(XMLSignature.ALGO_ID_MAC_HMAC_SHA1);
        Document signedDoc = sigBuilder.build(doc, secHeader);
        
        builder.prependToHeader(secHeader);
        
        String outputString = 
            org.apache.ws.security.util.XMLUtils.PrettyDocumentToString(signedDoc);
        assertTrue(outputString.indexOf("wsse:Username") != -1);
        assertTrue(outputString.indexOf("wsse:Password") == -1);
        assertTrue(outputString.indexOf("wsse11:Salt") != -1);
        assertTrue(outputString.indexOf("wsse11:Iteration") != -1);
        if (log.isDebugEnabled()) {
            log.debug(outputString);
        }
        
        // verify(signedDoc);
    }
    
    /**
     * Verifies the soap envelope.
     * 
     * @param env soap envelope
     * @throws java.lang.Exception Thrown when there is a problem in verification
     */
    private void verify(Document doc) throws Exception {
        secEngine.processSecurityHeader(doc, null, this, crypto);
    }
    
    
    public void handle(Callback[] callbacks)
        throws IOException, UnsupportedCallbackException {
        for (int i = 0; i < callbacks.length; i++) {
            if (callbacks[i] instanceof WSPasswordCallback) {
                //
                // Do nothing
                //
            } else {
                throw new UnsupportedCallbackException(callbacks[i], "Unrecognized Callback");
            }
        }
    }

}