Remove internal Optional usage in favor of null checks

config/src/main/java/org/springframework/security/config/annotation/web/configuration/OAuth2ClientConfiguration.java

@@ -71,13 +71,17 @@ static class OAuth2ClientWebMvcSecurityConfiguration implements WebMvcConfigurer
 		@Override
 		public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
 			if (this.clientRegistrationRepository != null && this.authorizedClientRepository != null) {
-				OAuth2AuthorizedClientProvider authorizedClientProvider =
+				OAuth2AuthorizedClientProviderBuilder authorizedClientProviderBuilder =
 						OAuth2AuthorizedClientProviderBuilder.builder()
 								.authorizationCode()
-								.refreshToken()
-								.clientCredentials(configurer ->
-										Optional.ofNullable(this.accessTokenResponseClient).ifPresent(configurer::accessTokenResponseClient))
-								.build();
+								.refreshToken();
+
+				if (this.accessTokenResponseClient != null) {
+					authorizedClientProviderBuilder.clientCredentials(configurer ->
+									configurer.accessTokenResponseClient(this.accessTokenResponseClient));
+				}
+				OAuth2AuthorizedClientProvider authorizedClientProvider = authorizedClientProviderBuilder.build();
+
 				DefaultOAuth2AuthorizedClientManager authorizedClientManager = new DefaultOAuth2AuthorizedClientManager(
 						this.clientRegistrationRepository, this.authorizedClientRepository);
 				authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider);

config/src/main/java/org/springframework/security/config/web/server/ServerHttpSecurity.java

@@ -27,7 +27,6 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.Optional;
 import java.util.UUID;
 import java.util.function.Function;
 import java.util.function.Supplier;
@@ -2665,10 +2664,10 @@ public ServerHttpSecurity disable() {
 		}
 
 		protected void configure(ServerHttpSecurity http) {
-			Optional.ofNullable(this.csrfTokenRepository).ifPresent(serverCsrfTokenRepository -> {
-				this.filter.setCsrfTokenRepository(serverCsrfTokenRepository);
-				http.logout().addLogoutHandler(new CsrfServerLogoutHandler(serverCsrfTokenRepository));
-			});
+			if (this.csrfTokenRepository != null) {
+				this.filter.setCsrfTokenRepository(this.csrfTokenRepository);
+				http.logout().addLogoutHandler(new CsrfServerLogoutHandler(this.csrfTokenRepository));
+			}
 			http.addFilterAt(this.filter, SecurityWebFiltersOrder.CSRF);
 		}
 
@@ -3607,19 +3606,21 @@ public ServerHttpSecurity disable() {
 			return and();
 		}
 
-		private Optional<ServerLogoutHandler> createLogoutHandler() {
+		private ServerLogoutHandler createLogoutHandler() {
 			if (this.logoutHandlers.isEmpty()) {
-				return Optional.empty();
-			}
-			else if (this.logoutHandlers.size() == 1) {
-				return Optional.of(this.logoutHandlers.get(0));
+				return null;
+			} else if (this.logoutHandlers.size() == 1) {
+				return this.logoutHandlers.get(0);
+			} else {
+				return new DelegatingServerLogoutHandler(this.logoutHandlers);
 			}
-
-			return Optional.of(new DelegatingServerLogoutHandler(this.logoutHandlers));
 		}
 
 		protected void configure(ServerHttpSecurity http) {
-			createLogoutHandler().ifPresent(this.logoutWebFilter::setLogoutHandler);
+			ServerLogoutHandler logoutHandler = createLogoutHandler();
+			if (logoutHandler != null) {
+				this.logoutWebFilter.setLogoutHandler(logoutHandler);
+			}
 			http.addFilterAt(this.logoutWebFilter, SecurityWebFiltersOrder.LOGOUT);
 		}
 

oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/oidc/web/logout/OidcClientInitiatedLogoutSuccessHandler.java

@@ -18,7 +18,6 @@
 
 import java.net.URI;
 import java.nio.charset.StandardCharsets;
-import java.util.Optional;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
@@ -52,25 +51,32 @@ public OidcClientInitiatedLogoutSuccessHandler(ClientRegistrationRepository clie
 	@Override
 	protected String determineTargetUrl(HttpServletRequest request,
 			HttpServletResponse response, Authentication authentication) {
+		String targetUrl = null;
+		URI endSessionEndpoint;
+		if (authentication instanceof OAuth2AuthenticationToken && authentication.getPrincipal() instanceof OidcUser) {
+			endSessionEndpoint = this.endSessionEndpoint((OAuth2AuthenticationToken) authentication);
+			if (endSessionEndpoint != null) {
+				targetUrl = endpointUri(endSessionEndpoint, authentication);
+			}
+		}
+		if (targetUrl == null) {
+			targetUrl = super.determineTargetUrl(request, response);
+		}
 
-		return Optional.of(authentication)
-				.filter(OAuth2AuthenticationToken.class::isInstance)
-				.filter(token -> authentication.getPrincipal() instanceof OidcUser)
-				.map(OAuth2AuthenticationToken.class::cast)
-				.flatMap(this::endSessionEndpoint)
-				.map(endSessionEndpoint -> endpointUri(endSessionEndpoint, authentication))
-				.orElseGet(() -> super.determineTargetUrl(request, response));
+		return targetUrl;
 	}
 
-	private Optional<URI> endSessionEndpoint(OAuth2AuthenticationToken token) {
+	private URI endSessionEndpoint(OAuth2AuthenticationToken token) {
 		String registrationId = token.getAuthorizedClientRegistrationId();
-		return Optional.of(
-				this.clientRegistrationRepository.findByRegistrationId(registrationId))
-				.map(ClientRegistration::getProviderDetails)
-				.map(ClientRegistration.ProviderDetails::getConfigurationMetadata)
-				.map(configurationMetadata -> configurationMetadata.get("end_session_endpoint"))
-				.map(Object::toString)
-				.map(URI::create);
+		ClientRegistration clientRegistration = this.clientRegistrationRepository.findByRegistrationId(registrationId);
+		Object endSessionEndpoint = clientRegistration.getProviderDetails().getConfigurationMetadata().get("end_session_endpoint");
+
+		URI result = null;
+		if (endSessionEndpoint != null) {
+			result = URI.create(endSessionEndpoint.toString());
+		}
+
+		return result;
 	}
 
 	private String endpointUri(URI endSessionEndpoint, Authentication authentication) {

oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/registration/ClientRegistrations.java

@@ -21,7 +21,6 @@
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.Optional;
 
 import com.nimbusds.oauth2.sdk.GrantType;
 import com.nimbusds.oauth2.sdk.ParseException;
@@ -141,8 +140,11 @@ public static ClientRegistration.Builder fromIssuerLocation(String issuer) {
 		Map<String, Object> configuration = getConfiguration(issuer, oidc(uri), oidcRfc8414(uri), oauth(uri));
 		AuthorizationServerMetadata metadata = parse(configuration, AuthorizationServerMetadata::parse);
 		ClientRegistration.Builder builder = withProviderConfiguration(metadata, issuer);
-		return Optional.ofNullable((String) configuration.get("userinfo_endpoint"))
-				.map(builder::userInfoUri).orElse(builder);
+		String userinfoEndpoint = (String) configuration.get("userinfo_endpoint");
+		if (userinfoEndpoint != null) {
+			builder.userInfoUri(userinfoEndpoint);
+		}
+		return builder;
 	}
 
 	private static URI oidc(URI issuer) {

oauth2/oauth2-resource-server/src/main/java/org/springframework/security/oauth2/server/resource/authentication/OAuth2IntrospectionAuthenticationProvider.java

@@ -16,11 +16,11 @@
 package org.springframework.security.oauth2.server.resource.authentication;
 
 import java.time.Instant;
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.List;
 import java.util.Map;
-import java.util.Optional;
-import java.util.stream.Collectors;
 
 import org.springframework.http.HttpStatus;
 import org.springframework.security.authentication.AbstractAuthenticationToken;
@@ -128,11 +128,12 @@ private AbstractAuthenticationToken convert(String token, Map<String, Object> cl
 	}
 
 	private Collection<GrantedAuthority> extractAuthorities(Map<String, Object> claims) {
-		Collection<String> scopes = (Collection<String>) claims.get(SCOPE);
-		return Optional.ofNullable(scopes).orElse(Collections.emptyList())
-				.stream()
-				.map(authority -> new SimpleGrantedAuthority("SCOPE_" + authority))
-				.collect(Collectors.toList());
+		Collection<String> scopes = (Collection<String>) claims.getOrDefault(SCOPE, Collections.emptyList());
+		List<GrantedAuthority> authorities = new ArrayList<>();
+		for (String scope : scopes) {
+			authorities.add(new SimpleGrantedAuthority("SCOPE_" + scope));
+		}
+		return authorities;
 	}
 
 	private static BearerTokenError invalidToken(String message) {

oauth2/oauth2-resource-server/src/main/java/org/springframework/security/oauth2/server/resource/authentication/OAuth2IntrospectionReactiveAuthenticationManager.java

@@ -17,11 +17,11 @@
 package org.springframework.security.oauth2.server.resource.authentication;
 
 import java.time.Instant;
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.List;
 import java.util.Map;
-import java.util.Optional;
-import java.util.stream.Collectors;
 
 import org.springframework.security.oauth2.core.OAuth2TokenAttributes;
 import reactor.core.publisher.Mono;
@@ -108,11 +108,12 @@ private Mono<OAuth2IntrospectionAuthenticationToken> authenticate(String token)
 	}
 
 	private Collection<GrantedAuthority> extractAuthorities(Map<String, Object> claims) {
-		Collection<String> scopes = (Collection<String>) claims.get(SCOPE);
-		return Optional.ofNullable(scopes).orElse(Collections.emptyList())
-				.stream()
-				.map(authority -> new SimpleGrantedAuthority("SCOPE_" + authority))
-				.collect(Collectors.toList());
+		Collection<String> scopes = (Collection<String>) claims.getOrDefault(SCOPE, Collections.emptyList());
+		List<GrantedAuthority> authorities = new ArrayList<>();
+		for (String scope : scopes) {
+			authorities.add(new SimpleGrantedAuthority("SCOPE_" + scope));
+		}
+		return authorities;
 	}
 
 	private static BearerTokenError invalidToken(String message) {

oauth2/oauth2-resource-server/src/main/java/org/springframework/security/oauth2/server/resource/introspection/NimbusOpaqueTokenIntrospector.java

@@ -22,7 +22,6 @@
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
-import java.util.Optional;
 import java.util.stream.Collectors;
 
 import com.nimbusds.oauth2.sdk.TokenIntrospectionResponse;
@@ -124,16 +123,22 @@ private MultiValueMap<String, String> requestBody(String token) {
 	 */
 	@Override
 	public Map<String, Object> introspect(String token) {
-		TokenIntrospectionSuccessResponse response = Optional.of(token)
-				.map(this.requestEntityConverter::convert)
-				.map(this::makeRequest)
-				.map(this::adaptToNimbusResponse)
-				.map(this::parseNimbusResponse)
-				.map(this::castToNimbusSuccess)
-				// relying solely on the authorization server to validate this token (not checking 'exp', for example)
-				.filter(TokenIntrospectionSuccessResponse::isActive)
-				.orElseThrow(() -> new OAuth2IntrospectionException("Provided token [" + token + "] isn't active"));
-		return convertClaimsSet(response);
+		RequestEntity<?> requestEntity = this.requestEntityConverter.convert(token);
+		if (requestEntity == null) {
+			throw new OAuth2IntrospectionException("Provided token [" + token + "] isn't active");
+		}
+
+		ResponseEntity<String> responseEntity = makeRequest(requestEntity);
+		HTTPResponse httpResponse = adaptToNimbusResponse(responseEntity);
+		TokenIntrospectionResponse introspectionResponse = parseNimbusResponse(httpResponse);
+		TokenIntrospectionSuccessResponse introspectionSuccessResponse = castToNimbusSuccess(introspectionResponse);
+
+		// relying solely on the authorization server to validate this token (not checking 'exp', for example)
+		if (!introspectionSuccessResponse.isActive()) {
+			throw new OAuth2IntrospectionException("Provided token [" + token + "] isn't active");
+		}
+
+		return convertClaimsSet(introspectionSuccessResponse);
 	}
 
 	/**

samples/boot/oauth2login/src/integration-test/java/org/springframework/security/samples/OAuth2LoginApplicationTests.java

@@ -67,7 +67,6 @@
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
-import java.util.Optional;
 import java.util.Set;
 import java.util.stream.Collectors;
 
@@ -331,10 +330,14 @@ private void assertIndexPage(HtmlPage page) throws Exception {
 	}
 
 	private HtmlAnchor getClientAnchorElement(HtmlPage page, ClientRegistration clientRegistration) {
-		Optional<HtmlAnchor> clientAnchorElement = page.getAnchors().stream()
-				.filter(e -> e.asText().equals(clientRegistration.getClientName())).findFirst();
-
-		return (clientAnchorElement.orElse(null));
+		HtmlAnchor result = null;
+		for (HtmlAnchor anchor: page.getAnchors()) {
+			if (anchor.asText().equals(clientRegistration.getClientName())) {
+				result = anchor;
+				break;
+			}
+		}
+		return result;
 	}
 
 	private WebResponse followLinkDisableRedirects(HtmlAnchor anchorElement) throws Exception {

web/src/main/java/org/springframework/security/web/server/csrf/CookieServerCsrfTokenRepository.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -16,7 +16,6 @@
 
 package org.springframework.security.web.server.csrf;
 
-import java.util.Optional;
 import java.util.UUID;
 
 import org.springframework.http.HttpCookie;
@@ -69,14 +68,17 @@ public Mono<CsrfToken> generateToken(ServerWebExchange exchange) {
 	@Override
 	public Mono<Void> saveToken(ServerWebExchange exchange, CsrfToken token) {
 		return Mono.fromRunnable(() -> {
-			Optional<String> tokenValue = Optional.ofNullable(token).map(CsrfToken::getToken);
+			String tokenValue = token != null ? token.getToken() : "";
+			int maxAge = !tokenValue.isEmpty() ? -1 : 0;
+			String path = this.cookiePath != null ? this.cookiePath : getRequestContext(exchange.getRequest());
+			boolean secure = exchange.getRequest().getSslInfo() != null;
 
-			ResponseCookie cookie = ResponseCookie.from(this.cookieName, tokenValue.orElse(""))
+			ResponseCookie cookie = ResponseCookie.from(this.cookieName, tokenValue)
 					.domain(this.cookieDomain)
 					.httpOnly(this.cookieHttpOnly)
-					.maxAge(tokenValue.map(val -> -1).orElse(0))
-					.path(Optional.ofNullable(this.cookiePath).orElseGet(() -> getRequestContext(exchange.getRequest())))
-					.secure(Optional.ofNullable(exchange.getRequest().getSslInfo()).map(sslInfo -> true).orElse(false))
+					.maxAge(maxAge)
+					.path(path)
+					.secure(secure)
 					.build();
 
 			exchange.getResponse().addCookie(cookie);

web/src/main/java/org/springframework/security/web/server/transport/HttpsRedirectWebFilter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -17,7 +17,6 @@
 package org.springframework.security.web.server.transport;
 
 import java.net.URI;
-import java.util.Optional;
 
 import reactor.core.publisher.Mono;
 
@@ -102,10 +101,11 @@ private URI createRedirectUri(ServerWebExchange exchange) {
 				UriComponentsBuilder.fromUri(exchange.getRequest().getURI());
 
 		if (port > 0) {
-			Optional.ofNullable(this.portMapper.lookupHttpsPort(port))
-					.map(builder::port)
-					.orElseThrow(() -> new IllegalStateException(
-							"HTTP Port '" + port + "' does not have a corresponding HTTPS Port"));
+			Integer httpsPort = this.portMapper.lookupHttpsPort(port);
+			if (httpsPort == null) {
+				throw new IllegalStateException("HTTP Port '" + port + "' does not have a corresponding HTTPS Port");
+			}
+			builder.port(httpsPort);
 		}
 
 		return builder.scheme("https").build().toUri();