/**
 * 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.cxf.sts.token.provider;

import java.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import org.w3c.dom.Element;

import org.apache.cxf.jaxws.context.WebServiceContextImpl;
import org.apache.cxf.jaxws.context.WrappedMessageContext;
import org.apache.cxf.message.MessageImpl;
import org.apache.cxf.sts.STSConstants;
import org.apache.cxf.sts.StaticSTSProperties;
import org.apache.cxf.sts.claims.ClaimTypes;
import org.apache.cxf.sts.claims.ClaimsAttributeStatementProvider;
import org.apache.cxf.sts.claims.ClaimsHandler;
import org.apache.cxf.sts.claims.ClaimsManager;
import org.apache.cxf.sts.claims.RequestClaim;
import org.apache.cxf.sts.claims.RequestClaimCollection;
import org.apache.cxf.sts.claims.StaticClaimsHandler;
import org.apache.cxf.sts.claims.StaticEndpointClaimsHandler;
import org.apache.cxf.sts.common.CustomAttributeProvider;
import org.apache.cxf.sts.common.CustomClaimsHandler;
import org.apache.cxf.sts.common.PasswordCallbackHandler;
import org.apache.cxf.sts.request.KeyRequirements;
import org.apache.cxf.sts.request.TokenRequirements;
import org.apache.cxf.sts.service.EncryptionProperties;
import org.apache.ws.security.CustomTokenPrincipal;
import org.apache.ws.security.WSConstants;
import org.apache.ws.security.WSSecurityException;
import org.apache.ws.security.components.crypto.Crypto;
import org.apache.ws.security.components.crypto.CryptoFactory;
import org.apache.ws.security.saml.ext.AssertionWrapper;
import org.apache.ws.security.saml.ext.builder.SAML2Constants;
import org.apache.ws.security.util.DOM2Writer;

import org.opensaml.saml2.core.Attribute;
import org.opensaml.xml.XMLObject;

/**
 * A unit test for creating a SAML Tokens with various Attributes populated by a ClaimsHandler.
 */
public class SAMLClaimsTest extends org.junit.Assert {
    
    public static final URI CLAIM_STATIC_COMPANY = 
        URI.create("http://apache.org/claims/test/company");
    
    public static final URI CLAIM_APPLICATION = 
        URI.create("http://apache.org/claims/test/applicationId");
    
    private static final String CLAIM_STATIC_COMPANY_VALUE = "myc@mpany";
    
    private static final String CLAIM_APPLICATION_VALUE = "my@pplic@tion";
    
    private static final String APPLICATION_APPLIES_TO = "http://dummy-service.com/dummy";
    
    /**
     * Test the creation of a SAML2 Assertion with various Attributes set by a ClaimsHandler.
     */
    @org.junit.Test
    public void testSaml2Claims() throws Exception {
        TokenProvider samlTokenProvider = new SAMLTokenProvider();
        TokenProviderParameters providerParameters = 
            createProviderParameters(WSConstants.WSS_SAML2_TOKEN_TYPE, STSConstants.BEARER_KEY_KEYTYPE, null);
        
        ClaimsManager claimsManager = new ClaimsManager();
        ClaimsHandler claimsHandler = new CustomClaimsHandler();
        claimsManager.setClaimHandlers(Collections.singletonList(claimsHandler));
        providerParameters.setClaimsManager(claimsManager);
        
        RequestClaimCollection claims = createClaims();
        providerParameters.setRequestedClaims(claims);
        
        List<AttributeStatementProvider> customProviderList = new ArrayList<AttributeStatementProvider>();
        customProviderList.add(new CustomAttributeProvider());
        ((SAMLTokenProvider)samlTokenProvider).setAttributeStatementProviders(customProviderList);
        
        assertTrue(samlTokenProvider.canHandleToken(WSConstants.WSS_SAML2_TOKEN_TYPE));
        TokenProviderResponse providerResponse = samlTokenProvider.createToken(providerParameters);
        assertTrue(providerResponse != null);
        assertTrue(providerResponse.getToken() != null && providerResponse.getTokenId() != null);
        
        Element token = providerResponse.getToken();
        String tokenString = DOM2Writer.nodeToString(token);
        assertTrue(tokenString.contains(providerResponse.getTokenId()));
        assertTrue(tokenString.contains("AttributeStatement"));
        assertTrue(tokenString.contains("alice"));
        assertTrue(tokenString.contains(SAML2Constants.CONF_BEARER));
        assertTrue(tokenString.contains(ClaimTypes.EMAILADDRESS.toString()));
        assertTrue(tokenString.contains(ClaimTypes.FIRSTNAME.toString()));
        assertTrue(tokenString.contains(ClaimTypes.LASTNAME.toString()));
    }
    
    /**
     * Test the creation of a SAML2 Assertion with StaticClaimsHandler
     */
    @org.junit.Test
    public void testSaml2StaticClaims() throws Exception {
        TokenProvider samlTokenProvider = new SAMLTokenProvider();
        TokenProviderParameters providerParameters = 
            createProviderParameters(WSConstants.WSS_SAML2_TOKEN_TYPE, STSConstants.BEARER_KEY_KEYTYPE, null);
        
        ClaimsManager claimsManager = new ClaimsManager();
        StaticClaimsHandler claimsHandler = new StaticClaimsHandler();
        Map<String, String> staticClaimsMap = new HashMap<String, String>();
        staticClaimsMap.put(CLAIM_STATIC_COMPANY.toString(), CLAIM_STATIC_COMPANY_VALUE);
        claimsHandler.setGlobalClaims(staticClaimsMap);
        claimsManager.setClaimHandlers(Collections.singletonList((ClaimsHandler)claimsHandler));
        providerParameters.setClaimsManager(claimsManager);
        
        RequestClaimCollection claims = new RequestClaimCollection();
        RequestClaim claim = new RequestClaim();
        claim.setClaimType(CLAIM_STATIC_COMPANY);
        claims.add(claim);
        providerParameters.setRequestedClaims(claims);
        
        List<AttributeStatementProvider> customProviderList = new ArrayList<AttributeStatementProvider>();
        customProviderList.add(new ClaimsAttributeStatementProvider());
        ((SAMLTokenProvider)samlTokenProvider).setAttributeStatementProviders(customProviderList);
        
        assertTrue(samlTokenProvider.canHandleToken(WSConstants.WSS_SAML2_TOKEN_TYPE));
        TokenProviderResponse providerResponse = samlTokenProvider.createToken(providerParameters);
        assertTrue(providerResponse != null);
        assertTrue(providerResponse.getToken() != null && providerResponse.getTokenId() != null);
        
        Element token = providerResponse.getToken();
        String tokenString = DOM2Writer.nodeToString(token);
        assertTrue(tokenString.contains(providerResponse.getTokenId()));
        assertTrue(tokenString.contains("AttributeStatement"));
        assertTrue(tokenString.contains("alice"));
        assertTrue(tokenString.contains(SAML2Constants.CONF_BEARER));
        
        AssertionWrapper assertion = new AssertionWrapper(token);
        List<Attribute> attributes = assertion.getSaml2().getAttributeStatements().get(0).getAttributes();
        assertEquals(attributes.size(), 1);
        assertEquals(attributes.get(0).getName(), CLAIM_STATIC_COMPANY.toString());
        XMLObject valueObj = attributes.get(0).getAttributeValues().get(0);
        assertEquals(valueObj.getDOM().getTextContent(), CLAIM_STATIC_COMPANY_VALUE);      
    }
    
    /**
     * Test the creation of a SAML2 Assertion with StaticEndpointClaimsHandler
     */
    @org.junit.Test
    public void testSaml2StaticEndpointClaims() throws Exception {
        TokenProvider samlTokenProvider = new SAMLTokenProvider();
        TokenProviderParameters providerParameters = 
            createProviderParameters(WSConstants.WSS_SAML2_TOKEN_TYPE, STSConstants.BEARER_KEY_KEYTYPE, null);
        
        ClaimsManager claimsManager = new ClaimsManager();
        StaticEndpointClaimsHandler claimsHandler = new StaticEndpointClaimsHandler();
        
        // Create claims map for specific application
        Map<String, String> endpointClaimsMap = new HashMap<String, String>();
        endpointClaimsMap.put(CLAIM_APPLICATION.toString(), CLAIM_APPLICATION_VALUE);
        
        Map<String, Map<String, String>> staticClaims = new HashMap<String, Map<String, String>>();
        staticClaims.put(APPLICATION_APPLIES_TO, endpointClaimsMap);
        claimsHandler.setEndpointClaims(staticClaims);
        
        List<URI> supportedClaims = new ArrayList<URI>();
        supportedClaims.add(CLAIM_APPLICATION);
        claimsHandler.setSupportedClaims(supportedClaims);
        
        claimsManager.setClaimHandlers(Collections.singletonList((ClaimsHandler)claimsHandler));
        providerParameters.setClaimsManager(claimsManager);
        
        RequestClaimCollection claims = new RequestClaimCollection();
        RequestClaim claim = new RequestClaim();
        claim.setClaimType(CLAIM_APPLICATION);
        claims.add(claim);
        providerParameters.setRequestedClaims(claims);
        
        List<AttributeStatementProvider> customProviderList = new ArrayList<AttributeStatementProvider>();
        customProviderList.add(new ClaimsAttributeStatementProvider());
        ((SAMLTokenProvider)samlTokenProvider).setAttributeStatementProviders(customProviderList);
        
        assertTrue(samlTokenProvider.canHandleToken(WSConstants.WSS_SAML2_TOKEN_TYPE));
        TokenProviderResponse providerResponse = samlTokenProvider.createToken(providerParameters);
        assertTrue(providerResponse != null);
        assertTrue(providerResponse.getToken() != null && providerResponse.getTokenId() != null);
        
        Element token = providerResponse.getToken();
        String tokenString = DOM2Writer.nodeToString(token);
        assertTrue(tokenString.contains(providerResponse.getTokenId()));
        assertTrue(tokenString.contains("AttributeStatement"));
        assertTrue(tokenString.contains("alice"));
        assertTrue(tokenString.contains(SAML2Constants.CONF_BEARER));
        
        AssertionWrapper assertion = new AssertionWrapper(token);
        List<Attribute> attributes = assertion.getSaml2().getAttributeStatements().get(0).getAttributes();
        assertEquals(attributes.size(), 1);
        assertEquals(attributes.get(0).getName(), CLAIM_APPLICATION.toString());
        XMLObject valueObj = attributes.get(0).getAttributeValues().get(0);
        assertEquals(valueObj.getDOM().getTextContent(), CLAIM_APPLICATION_VALUE);      
    }
    
    /**
     * Test the creation of a SAML2 Assertion with StaticEndpointClaimsHandler
     * but unknown AppliesTo value
     */
    @org.junit.Test
    public void testSaml2StaticEndpointClaimsUnknownAppliesTo() throws Exception {
        TokenProvider samlTokenProvider = new SAMLTokenProvider();
        TokenProviderParameters providerParameters = 
            createProviderParameters(WSConstants.WSS_SAML2_TOKEN_TYPE, 
                    STSConstants.BEARER_KEY_KEYTYPE, APPLICATION_APPLIES_TO + "UNKNOWN");
        
        ClaimsManager claimsManager = new ClaimsManager();
        StaticEndpointClaimsHandler claimsHandler = new StaticEndpointClaimsHandler();
        
        // Create claims map for specific application
        Map<String, String> endpointClaimsMap = new HashMap<String, String>();
        endpointClaimsMap.put(CLAIM_APPLICATION.toString(), CLAIM_APPLICATION_VALUE);
        
        Map<String, Map<String, String>> staticClaims = new HashMap<String, Map<String, String>>();
        staticClaims.put(APPLICATION_APPLIES_TO, endpointClaimsMap);
        claimsHandler.setEndpointClaims(staticClaims);
        
        List<URI> supportedClaims = new ArrayList<URI>();
        supportedClaims.add(CLAIM_APPLICATION);
        claimsHandler.setSupportedClaims(supportedClaims);
        
        claimsManager.setClaimHandlers(Collections.singletonList((ClaimsHandler)claimsHandler));
        providerParameters.setClaimsManager(claimsManager);
        
        RequestClaimCollection claims = new RequestClaimCollection();
        RequestClaim claim = new RequestClaim();
        claim.setClaimType(CLAIM_APPLICATION);
        claims.add(claim);
        providerParameters.setRequestedClaims(claims);
        
        List<AttributeStatementProvider> customProviderList = new ArrayList<AttributeStatementProvider>();
        customProviderList.add(new ClaimsAttributeStatementProvider());
        ((SAMLTokenProvider)samlTokenProvider).setAttributeStatementProviders(customProviderList);
        assertTrue(samlTokenProvider.canHandleToken(WSConstants.WSS_SAML2_TOKEN_TYPE));
        
        try {
            samlTokenProvider.createToken(providerParameters);
            fail("Failure expected as the claim for the application can't be found due to unknown AppliesTo");
        } catch (Exception ex) {
            // expected on the wrong attribute provider
        }        
    }
    
    private TokenProviderParameters createProviderParameters(
        String tokenType, String keyType, String appliesTo
    ) throws WSSecurityException {
        TokenProviderParameters parameters = new TokenProviderParameters();
        
        TokenRequirements tokenRequirements = new TokenRequirements();
        tokenRequirements.setTokenType(tokenType);
        parameters.setTokenRequirements(tokenRequirements);
        
        KeyRequirements keyRequirements = new KeyRequirements();
        keyRequirements.setKeyType(keyType);
        parameters.setKeyRequirements(keyRequirements);
        
        parameters.setPrincipal(new CustomTokenPrincipal("alice"));
        // Mock up message context
        MessageImpl msg = new MessageImpl();
        WrappedMessageContext msgCtx = new WrappedMessageContext(msg);
        WebServiceContextImpl webServiceContext = new WebServiceContextImpl(msgCtx);
        parameters.setWebServiceContext(webServiceContext);
        
        if (appliesTo != null) {
            parameters.setAppliesToAddress(appliesTo);
        } else {
            parameters.setAppliesToAddress(APPLICATION_APPLIES_TO);
        }
        
        // Add STSProperties object
        StaticSTSProperties stsProperties = new StaticSTSProperties();
        Crypto crypto = CryptoFactory.getInstance(getEncryptionProperties());
        stsProperties.setEncryptionCrypto(crypto);
        stsProperties.setSignatureCrypto(crypto);
        stsProperties.setEncryptionUsername("myservicekey");
        stsProperties.setSignatureUsername("mystskey");
        stsProperties.setCallbackHandler(new PasswordCallbackHandler());
        stsProperties.setIssuer("STS");
        parameters.setStsProperties(stsProperties);
        
        parameters.setEncryptionProperties(new EncryptionProperties());
        

        
        return parameters;
    }
    
    private Properties getEncryptionProperties() {
        Properties properties = new Properties();
        properties.put(
            "org.apache.ws.security.crypto.provider", "org.apache.ws.security.components.crypto.Merlin"
        );
        properties.put("org.apache.ws.security.crypto.merlin.keystore.password", "stsspass");
        properties.put("org.apache.ws.security.crypto.merlin.keystore.file", "stsstore.jks");
        
        return properties;
    }
    
    /**
     * Create a set of parsed Claims
     */
    private RequestClaimCollection createClaims() {
        RequestClaimCollection claims = new RequestClaimCollection();
        
        RequestClaim claim = new RequestClaim();
        claim.setClaimType(ClaimTypes.FIRSTNAME);
        claims.add(claim);
        
        claim = new RequestClaim();
        claim.setClaimType(ClaimTypes.LASTNAME);
        claims.add(claim);
        
        claim = new RequestClaim();
        claim.setClaimType(ClaimTypes.EMAILADDRESS);
        claims.add(claim);
        
        return claims;
    }
    
}
