/*
 * Copyright 2002-2022 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.security.config.http;

import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.w3c.dom.Element;

import org.springframework.beans.BeanMetadataElement;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanReference;
import org.springframework.beans.factory.config.RuntimeBeanReference;
import org.springframework.beans.factory.parsing.BeanComponentDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.BeanDefinitionParser;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.core.ResolvableType;
import org.springframework.http.MediaType;
import org.springframework.security.authentication.AuthenticationProvider;
import org.springframework.security.config.Elements;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.oauth2.client.authentication.OAuth2LoginAuthenticationProvider;
import org.springframework.security.oauth2.client.authentication.OAuth2LoginAuthenticationToken;
import org.springframework.security.oauth2.client.registration.ClientRegistration;
import org.springframework.security.oauth2.client.registration.ClientRegistrationRepository;
import org.springframework.security.oauth2.client.web.OAuth2AuthorizationRequestRedirectFilter;
import org.springframework.security.oauth2.client.web.OAuth2AuthorizedClientRepository;
import org.springframework.security.oauth2.client.web.OAuth2LoginAuthenticationFilter;
import org.springframework.security.oauth2.core.OAuth2AuthenticationException;
import org.springframework.security.oauth2.core.OAuth2Error;
import org.springframework.security.oauth2.core.oidc.OidcScopes;
import org.springframework.security.web.AuthenticationEntryPoint;
import org.springframework.security.web.authentication.DelegatingAuthenticationEntryPoint;
import org.springframework.security.web.authentication.LoginUrlAuthenticationEntryPoint;
import org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter;
import org.springframework.security.web.util.matcher.AndRequestMatcher;
import org.springframework.security.web.util.matcher.AntPathRequestMatcher;
import org.springframework.security.web.util.matcher.MediaTypeRequestMatcher;
import org.springframework.security.web.util.matcher.NegatedRequestMatcher;
import org.springframework.security.web.util.matcher.OrRequestMatcher;
import org.springframework.security.web.util.matcher.RequestHeaderRequestMatcher;
import org.springframework.security.web.util.matcher.RequestMatcher;
import org.springframework.util.ClassUtils;
import org.springframework.util.StringUtils;
import org.springframework.util.xml.DomUtils;
import org.springframework.web.accept.ContentNegotiationStrategy;
import org.springframework.web.accept.HeaderContentNegotiationStrategy;

/**
 * @author Ruby Hartono
 * @since 5.3
 */
final class OAuth2LoginBeanDefinitionParser implements BeanDefinitionParser {

	private static final String DEFAULT_AUTHORIZATION_REQUEST_BASE_URI = "/oauth2/authorization";

	private static final String DEFAULT_LOGIN_URI = DefaultLoginPageGeneratingFilter.DEFAULT_LOGIN_PAGE_URL;

	private static final String ELT_CLIENT_REGISTRATION = "client-registration";

	private static final String ATT_REGISTRATION_ID = "registration-id";

	private static final String ATT_AUTHORIZATION_REQUEST_REPOSITORY_REF = "authorization-request-repository-ref";

	private static final String ATT_AUTHORIZATION_REQUEST_RESOLVER_REF = "authorization-request-resolver-ref";

	private static final String ATT_AUTHORIZATION_REDIRECT_STRATEGY_REF = "authorization-redirect-strategy-ref";

	private static final String ATT_ACCESS_TOKEN_RESPONSE_CLIENT_REF = "access-token-response-client-ref";

	private static final String ATT_USER_AUTHORITIES_MAPPER_REF = "user-authorities-mapper-ref";

	private static final String ATT_USER_SERVICE_REF = "user-service-ref";

	private static final String ATT_OIDC_USER_SERVICE_REF = "oidc-user-service-ref";

	private static final String ATT_LOGIN_PROCESSING_URL = "login-processing-url";

	private static final String ATT_LOGIN_PAGE = "login-page";

	private static final String ATT_AUTHENTICATION_SUCCESS_HANDLER_REF = "authentication-success-handler-ref";

	private static final String ATT_AUTHENTICATION_FAILURE_HANDLER_REF = "authentication-failure-handler-ref";

	private static final String ATT_JWT_DECODER_FACTORY_REF = "jwt-decoder-factory-ref";

	private final BeanReference requestCache;

	private final BeanReference portMapper;

	private final BeanReference portResolver;

	private final BeanReference sessionStrategy;

	private final boolean allowSessionCreation;

	private final BeanMetadataElement authenticationFilterSecurityContextHolderStrategy;

	private BeanDefinition defaultAuthorizedClientRepository;

	private BeanDefinition oauth2AuthorizationRequestRedirectFilter;

	private BeanDefinition oauth2LoginAuthenticationEntryPoint;

	private BeanDefinition oauth2LoginAuthenticationProvider;

	private BeanDefinition oauth2LoginOidcAuthenticationProvider;

	private BeanDefinition oauth2LoginLinks;

	OAuth2LoginBeanDefinitionParser(BeanReference requestCache, BeanReference portMapper, BeanReference portResolver,
			BeanReference sessionStrategy, boolean allowSessionCreation,
			BeanMetadataElement authenticationFilterSecurityContextHolderStrategy) {
		this.requestCache = requestCache;
		this.portMapper = portMapper;
		this.portResolver = portResolver;
		this.sessionStrategy = sessionStrategy;
		this.allowSessionCreation = allowSessionCreation;
		this.authenticationFilterSecurityContextHolderStrategy = authenticationFilterSecurityContextHolderStrategy;
	}

	@Override
	public BeanDefinition parse(Element element, ParserContext parserContext) {
		// register magic bean
		BeanDefinition oauth2LoginBeanConfig = BeanDefinitionBuilder.rootBeanDefinition(OAuth2LoginBeanConfig.class)
				.getBeanDefinition();
		String oauth2LoginBeanConfigId = parserContext.getReaderContext().generateBeanName(oauth2LoginBeanConfig);
		parserContext
				.registerBeanComponent(new BeanComponentDefinition(oauth2LoginBeanConfig, oauth2LoginBeanConfigId));
		// configure filter
		BeanMetadataElement clientRegistrationRepository = OAuth2ClientBeanDefinitionParserUtils
				.getClientRegistrationRepository(element);
		BeanMetadataElement authorizedClientRepository = OAuth2ClientBeanDefinitionParserUtils
				.getAuthorizedClientRepository(element);
		if (authorizedClientRepository == null) {
			BeanMetadataElement authorizedClientService = OAuth2ClientBeanDefinitionParserUtils
					.getAuthorizedClientService(element);
			this.defaultAuthorizedClientRepository = OAuth2ClientBeanDefinitionParserUtils
					.createDefaultAuthorizedClientRepository(clientRegistrationRepository, authorizedClientService);
			authorizedClientRepository = new RuntimeBeanReference(OAuth2AuthorizedClientRepository.class);
		}
		BeanMetadataElement accessTokenResponseClient = getAccessTokenResponseClient(element);
		BeanMetadataElement oauth2UserService = getOAuth2UserService(element);
		BeanMetadataElement authorizationRequestRepository = getAuthorizationRequestRepository(element);
		BeanDefinitionBuilder oauth2LoginAuthenticationFilterBuilder = BeanDefinitionBuilder
				.rootBeanDefinition(OAuth2LoginAuthenticationFilter.class)
				.addConstructorArgValue(clientRegistrationRepository).addConstructorArgValue(authorizedClientRepository)
				.addPropertyValue("authorizationRequestRepository", authorizationRequestRepository);
		if (this.sessionStrategy != null) {
			oauth2LoginAuthenticationFilterBuilder.addPropertyValue("sessionAuthenticationStrategy",
					this.sessionStrategy);
		}
		Object source = parserContext.extractSource(element);
		String loginProcessingUrl = element.getAttribute(ATT_LOGIN_PROCESSING_URL);
		if (StringUtils.hasLength(loginProcessingUrl)) {
			WebConfigUtils.validateHttpRedirect(loginProcessingUrl, parserContext, source);
			oauth2LoginAuthenticationFilterBuilder.addConstructorArgValue(loginProcessingUrl);
		}
		else {
			oauth2LoginAuthenticationFilterBuilder
					.addConstructorArgValue(OAuth2LoginAuthenticationFilter.DEFAULT_FILTER_PROCESSES_URI);
		}
		BeanDefinitionBuilder oauth2LoginAuthenticationProviderBuilder = BeanDefinitionBuilder
				.rootBeanDefinition(OAuth2LoginAuthenticationProvider.class)
				.addConstructorArgValue(accessTokenResponseClient).addConstructorArgValue(oauth2UserService);
		String userAuthoritiesMapperRef = element.getAttribute(ATT_USER_AUTHORITIES_MAPPER_REF);
		if (StringUtils.hasLength(userAuthoritiesMapperRef)) {
			oauth2LoginAuthenticationProviderBuilder.addPropertyReference("authoritiesMapper",
					userAuthoritiesMapperRef);
		}
		this.oauth2LoginAuthenticationProvider = oauth2LoginAuthenticationProviderBuilder.getBeanDefinition();
		this.oauth2LoginOidcAuthenticationProvider = getOidcAuthProvider(element, accessTokenResponseClient,
				userAuthoritiesMapperRef);
		BeanDefinitionBuilder oauth2AuthorizationRequestRedirectFilterBuilder = BeanDefinitionBuilder
				.rootBeanDefinition(OAuth2AuthorizationRequestRedirectFilter.class);
		String authorizationRequestResolverRef = element.getAttribute(ATT_AUTHORIZATION_REQUEST_RESOLVER_REF);
		if (StringUtils.hasLength(authorizationRequestResolverRef)) {
			oauth2AuthorizationRequestRedirectFilterBuilder.addConstructorArgReference(authorizationRequestResolverRef);
		}
		else {
			oauth2AuthorizationRequestRedirectFilterBuilder.addConstructorArgValue(clientRegistrationRepository);
		}
		oauth2AuthorizationRequestRedirectFilterBuilder
				.addPropertyValue("authorizationRequestRepository", authorizationRequestRepository)
				.addPropertyValue("authorizationRedirectStrategy", getAuthorizationRedirectStrategy(element))
				.addPropertyValue("requestCache", this.requestCache);
		this.oauth2AuthorizationRequestRedirectFilter = oauth2AuthorizationRequestRedirectFilterBuilder
				.getBeanDefinition();
		String authenticationSuccessHandlerRef = element.getAttribute(ATT_AUTHENTICATION_SUCCESS_HANDLER_REF);
		if (StringUtils.hasLength(authenticationSuccessHandlerRef)) {
			oauth2LoginAuthenticationFilterBuilder.addPropertyReference("authenticationSuccessHandler",
					authenticationSuccessHandlerRef);
		}
		else {
			BeanDefinitionBuilder successHandlerBuilder = BeanDefinitionBuilder.rootBeanDefinition(
					"org.springframework.security.web.authentication.SavedRequestAwareAuthenticationSuccessHandler")
					.addPropertyValue("requestCache", this.requestCache);
			oauth2LoginAuthenticationFilterBuilder.addPropertyValue("authenticationSuccessHandler",
					successHandlerBuilder.getBeanDefinition());
		}
		String loginPage = element.getAttribute(ATT_LOGIN_PAGE);
		if (StringUtils.hasLength(loginPage)) {
			WebConfigUtils.validateHttpRedirect(loginPage, parserContext, source);
			this.oauth2LoginAuthenticationEntryPoint = BeanDefinitionBuilder
					.rootBeanDefinition(LoginUrlAuthenticationEntryPoint.class).addConstructorArgValue(loginPage)
					.addPropertyValue("portMapper", this.portMapper).addPropertyValue("portResolver", this.portResolver)
					.getBeanDefinition();
		}
		else {
			Map<RequestMatcher, AuthenticationEntryPoint> entryPoint = getLoginEntryPoint(element);
			if (entryPoint != null) {
				this.oauth2LoginAuthenticationEntryPoint = BeanDefinitionBuilder
						.rootBeanDefinition(DelegatingAuthenticationEntryPoint.class).addConstructorArgValue(entryPoint)
						.addPropertyValue("defaultEntryPoint", new LoginUrlAuthenticationEntryPoint(DEFAULT_LOGIN_URI))
						.getBeanDefinition();
			}
		}
		String authenticationFailureHandlerRef = element.getAttribute(ATT_AUTHENTICATION_FAILURE_HANDLER_REF);
		if (StringUtils.hasLength(authenticationFailureHandlerRef)) {
			oauth2LoginAuthenticationFilterBuilder.addPropertyReference("authenticationFailureHandler",
					authenticationFailureHandlerRef);
		}
		else {
			BeanDefinitionBuilder failureHandlerBuilder = BeanDefinitionBuilder.rootBeanDefinition(
					"org.springframework.security.web.authentication.SimpleUrlAuthenticationFailureHandler");
			failureHandlerBuilder.addConstructorArgValue(
					DEFAULT_LOGIN_URI + "?" + DefaultLoginPageGeneratingFilter.ERROR_PARAMETER_NAME);
			failureHandlerBuilder.addPropertyValue("allowSessionCreation", this.allowSessionCreation);
			oauth2LoginAuthenticationFilterBuilder.addPropertyValue("authenticationFailureHandler",
					failureHandlerBuilder.getBeanDefinition());
		}
		oauth2LoginAuthenticationFilterBuilder.addPropertyValue("securityContextHolderStrategy",
				this.authenticationFilterSecurityContextHolderStrategy);
		// prepare loginlinks
		this.oauth2LoginLinks = BeanDefinitionBuilder.rootBeanDefinition(Map.class)
				.setFactoryMethodOnBean("getLoginLinks", oauth2LoginBeanConfigId).getBeanDefinition();
		return oauth2LoginAuthenticationFilterBuilder.getBeanDefinition();
	}

	private BeanMetadataElement getAuthorizationRequestRepository(Element element) {
		String authorizationRequestRepositoryRef = element.getAttribute(ATT_AUTHORIZATION_REQUEST_REPOSITORY_REF);
		if (StringUtils.hasLength(authorizationRequestRepositoryRef)) {
			return new RuntimeBeanReference(authorizationRequestRepositoryRef);
		}
		return BeanDefinitionBuilder.rootBeanDefinition(
				"org.springframework.security.oauth2.client.web.HttpSessionOAuth2AuthorizationRequestRepository")
				.getBeanDefinition();
	}

	private BeanMetadataElement getAuthorizationRedirectStrategy(Element element) {
		String authorizationRedirectStrategyRef = element.getAttribute(ATT_AUTHORIZATION_REDIRECT_STRATEGY_REF);
		if (StringUtils.hasText(authorizationRedirectStrategyRef)) {
			return new RuntimeBeanReference(authorizationRedirectStrategyRef);
		}
		return BeanDefinitionBuilder.rootBeanDefinition("org.springframework.security.web.DefaultRedirectStrategy")
				.getBeanDefinition();
	}

	private BeanDefinition getOidcAuthProvider(Element element, BeanMetadataElement accessTokenResponseClient,
			String userAuthoritiesMapperRef) {
		boolean oidcAuthenticationProviderEnabled = ClassUtils
				.isPresent("org.springframework.security.oauth2.jwt.JwtDecoder", this.getClass().getClassLoader());
		if (!oidcAuthenticationProviderEnabled) {
			return BeanDefinitionBuilder.rootBeanDefinition(OidcAuthenticationRequestChecker.class).getBeanDefinition();
		}
		BeanMetadataElement oidcUserService = getOidcUserService(element);
		BeanDefinitionBuilder oidcAuthProviderBuilder = BeanDefinitionBuilder.rootBeanDefinition(
				"org.springframework.security.oauth2.client.oidc.authentication.OidcAuthorizationCodeAuthenticationProvider")
				.addConstructorArgValue(accessTokenResponseClient).addConstructorArgValue(oidcUserService);
		if (StringUtils.hasLength(userAuthoritiesMapperRef)) {
			oidcAuthProviderBuilder.addPropertyReference("authoritiesMapper", userAuthoritiesMapperRef);
		}
		String jwtDecoderFactoryRef = element.getAttribute(ATT_JWT_DECODER_FACTORY_REF);
		if (StringUtils.hasLength(jwtDecoderFactoryRef)) {
			oidcAuthProviderBuilder.addPropertyReference("jwtDecoderFactory", jwtDecoderFactoryRef);
		}
		return oidcAuthProviderBuilder.getBeanDefinition();
	}

	private BeanMetadataElement getOidcUserService(Element element) {
		String oidcUserServiceRef = element.getAttribute(ATT_OIDC_USER_SERVICE_REF);
		if (StringUtils.hasLength(oidcUserServiceRef)) {
			return new RuntimeBeanReference(oidcUserServiceRef);
		}
		return BeanDefinitionBuilder
				.rootBeanDefinition("org.springframework.security.oauth2.client.oidc.userinfo.OidcUserService")
				.getBeanDefinition();
	}

	private BeanMetadataElement getOAuth2UserService(Element element) {
		String oauth2UserServiceRef = element.getAttribute(ATT_USER_SERVICE_REF);
		if (StringUtils.hasLength(oauth2UserServiceRef)) {
			return new RuntimeBeanReference(oauth2UserServiceRef);
		}
		return BeanDefinitionBuilder
				.rootBeanDefinition("org.springframework.security.oauth2.client.userinfo.DefaultOAuth2UserService")
				.getBeanDefinition();
	}

	private BeanMetadataElement getAccessTokenResponseClient(Element element) {
		String accessTokenResponseClientRef = element.getAttribute(ATT_ACCESS_TOKEN_RESPONSE_CLIENT_REF);
		if (StringUtils.hasLength(accessTokenResponseClientRef)) {
			return new RuntimeBeanReference(accessTokenResponseClientRef);
		}
		return BeanDefinitionBuilder.rootBeanDefinition(
				"org.springframework.security.oauth2.client.endpoint.DefaultAuthorizationCodeTokenResponseClient")
				.getBeanDefinition();
	}

	BeanDefinition getDefaultAuthorizedClientRepository() {
		return this.defaultAuthorizedClientRepository;
	}

	BeanDefinition getOAuth2AuthorizationRequestRedirectFilter() {
		return this.oauth2AuthorizationRequestRedirectFilter;
	}

	BeanDefinition getOAuth2LoginAuthenticationEntryPoint() {
		return this.oauth2LoginAuthenticationEntryPoint;
	}

	BeanDefinition getOAuth2LoginAuthenticationProvider() {
		return this.oauth2LoginAuthenticationProvider;
	}

	BeanDefinition getOAuth2LoginOidcAuthenticationProvider() {
		return this.oauth2LoginOidcAuthenticationProvider;
	}

	BeanDefinition getOAuth2LoginLinks() {
		return this.oauth2LoginLinks;
	}

	private Map<RequestMatcher, AuthenticationEntryPoint> getLoginEntryPoint(Element element) {
		Map<RequestMatcher, AuthenticationEntryPoint> entryPoints = null;
		Element clientRegsElt = DomUtils.getChildElementByTagName(element.getOwnerDocument().getDocumentElement(),
				Elements.CLIENT_REGISTRATIONS);
		if (clientRegsElt != null) {
			List<Element> clientRegList = DomUtils.getChildElementsByTagName(clientRegsElt, ELT_CLIENT_REGISTRATION);
			if (clientRegList.size() == 1) {
				RequestMatcher loginPageMatcher = new AntPathRequestMatcher(DEFAULT_LOGIN_URI);
				RequestMatcher faviconMatcher = new AntPathRequestMatcher("/favicon.ico");
				RequestMatcher defaultEntryPointMatcher = this.getAuthenticationEntryPointMatcher();
				RequestMatcher defaultLoginPageMatcher = new AndRequestMatcher(
						new OrRequestMatcher(loginPageMatcher, faviconMatcher), defaultEntryPointMatcher);
				RequestMatcher notXRequestedWith = new NegatedRequestMatcher(
						new RequestHeaderRequestMatcher("X-Requested-With", "XMLHttpRequest"));
				Element clientRegElt = clientRegList.get(0);
				entryPoints = new LinkedHashMap<>();
				entryPoints.put(
						new AndRequestMatcher(notXRequestedWith, new NegatedRequestMatcher(defaultLoginPageMatcher)),
						new LoginUrlAuthenticationEntryPoint(DEFAULT_AUTHORIZATION_REQUEST_BASE_URI + "/"
								+ clientRegElt.getAttribute(ATT_REGISTRATION_ID)));
			}
		}
		return entryPoints;
	}

	private RequestMatcher getAuthenticationEntryPointMatcher() {
		ContentNegotiationStrategy contentNegotiationStrategy = new HeaderContentNegotiationStrategy();
		MediaTypeRequestMatcher mediaMatcher = new MediaTypeRequestMatcher(contentNegotiationStrategy,
				MediaType.APPLICATION_XHTML_XML, new MediaType("image", "*"), MediaType.TEXT_HTML,
				MediaType.TEXT_PLAIN);
		mediaMatcher.setIgnoredMediaTypes(Collections.singleton(MediaType.ALL));
		RequestMatcher notXRequestedWith = new NegatedRequestMatcher(
				new RequestHeaderRequestMatcher("X-Requested-With", "XMLHttpRequest"));
		return new AndRequestMatcher(Arrays.asList(notXRequestedWith, mediaMatcher));
	}

	private static class OidcAuthenticationRequestChecker implements AuthenticationProvider {

		@Override
		public Authentication authenticate(Authentication authentication) throws AuthenticationException {
			OAuth2LoginAuthenticationToken authorizationCodeAuthentication = (OAuth2LoginAuthenticationToken) authentication;
			if (!authorizationCodeAuthentication.getAuthorizationExchange().getAuthorizationRequest().getScopes()
					.contains(OidcScopes.OPENID)) {
				return null;
			}
			// Section 3.1.2.1 Authentication Request -
			// https://openid.net/specs/openid-connect-core-1_0.html#AuthRequest scope
			// REQUIRED. OpenID Connect requests MUST contain the "openid" scope
			// value.
			OAuth2Error oauth2Error = new OAuth2Error("oidc_provider_not_configured",
					"An OpenID Connect Authentication Provider has not been configured. "
							+ "Check to ensure you include the dependency 'spring-security-oauth2-jose'.",
					null);
			throw new OAuth2AuthenticationException(oauth2Error, oauth2Error.toString());
		}

		@Override
		public boolean supports(Class<?> authentication) {
			return OAuth2LoginAuthenticationToken.class.isAssignableFrom(authentication);
		}

	}

	/**
	 * Wrapper bean class to provide configuration from applicationContext
	 */
	private static class OAuth2LoginBeanConfig implements ApplicationContextAware {

		private ApplicationContext context;

		@Override
		public void setApplicationContext(ApplicationContext context) throws BeansException {
			this.context = context;
		}

		@SuppressWarnings({ "unchecked", "unused" })
		Map<String, String> getLoginLinks() {
			Iterable<ClientRegistration> clientRegistrations = null;
			ClientRegistrationRepository clientRegistrationRepository = this.context
					.getBean(ClientRegistrationRepository.class);
			ResolvableType type = ResolvableType.forInstance(clientRegistrationRepository).as(Iterable.class);
			if (type != ResolvableType.NONE && ClientRegistration.class.isAssignableFrom(type.resolveGenerics()[0])) {
				clientRegistrations = (Iterable<ClientRegistration>) clientRegistrationRepository;
			}
			if (clientRegistrations == null) {
				return Collections.emptyMap();
			}
			String authorizationRequestBaseUri = DEFAULT_AUTHORIZATION_REQUEST_BASE_URI;
			Map<String, String> loginUrlToClientName = new HashMap<>();
			clientRegistrations.forEach((registration) -> loginUrlToClientName.put(
					authorizationRequestBaseUri + "/" + registration.getRegistrationId(),
					registration.getClientName()));
			return loginUrlToClientName;
		}

	}

}
