diff --git a/oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/authentication/OAuth2LoginReactiveAuthenticationManager.java b/oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/authentication/OAuth2LoginReactiveAuthenticationManager.java
new file mode 100644
index 0000000000..8509db1f2f
--- /dev/null
+++ b/oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/authentication/OAuth2LoginReactiveAuthenticationManager.java
@@ -0,0 +1,136 @@
+/*
+ * Copyright 2002-2018 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
+ *
+ * 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.springframework.security.oauth2.client.authentication;
+
+import java.util.Collection;
+
+import org.springframework.security.authentication.ReactiveAuthenticationManager;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.GrantedAuthority;
+import org.springframework.security.core.authority.mapping.GrantedAuthoritiesMapper;
+import org.springframework.security.oauth2.client.OAuth2AuthorizedClient;
+import org.springframework.security.oauth2.client.ReactiveOAuth2AuthorizedClientService;
+import org.springframework.security.oauth2.client.endpoint.OAuth2AuthorizationCodeGrantRequest;
+import org.springframework.security.oauth2.client.endpoint.ReactiveOAuth2AccessTokenResponseClient;
+import org.springframework.security.oauth2.client.userinfo.OAuth2UserRequest;
+import org.springframework.security.oauth2.client.userinfo.ReactiveOAuth2UserService;
+import org.springframework.security.oauth2.core.OAuth2AccessToken;
+import org.springframework.security.oauth2.core.endpoint.OAuth2AccessTokenResponse;
+import org.springframework.security.oauth2.core.user.OAuth2User;
+import org.springframework.util.Assert;
+
+import reactor.core.publisher.Mono;
+
+
+/**
+ * An implementation of an {@link org.springframework.security.authentication.AuthenticationProvider} for OAuth 2.0 Login,
+ * which leverages the OAuth 2.0 Authorization Code Grant Flow.
+ *
+ * This {@link org.springframework.security.authentication.AuthenticationProvider} is responsible for authenticating
+ * an Authorization Code credential with the Authorization Server's Token Endpoint
+ * and if valid, exchanging it for an Access Token credential.
+ *
+ * It will also obtain the user attributes of the End-User (Resource Owner)
+ * from the UserInfo Endpoint using an {@link org.springframework.security.oauth2.client.userinfo.OAuth2UserService},
+ * which will create a {@code Principal} in the form of an {@link OAuth2User}.
+ * The {@code OAuth2User} is then associated to the {@link OAuth2LoginAuthenticationToken}
+ * to complete the authentication.
+ *
+ * @author Rob Winch
+ * @since 5.1
+ * @see OAuth2LoginAuthenticationToken
+ * @see org.springframework.security.oauth2.client.endpoint.ReactiveOAuth2AccessTokenResponseClient
+ * @see org.springframework.security.oauth2.client.userinfo.ReactiveOAuth2UserService
+ * @see OAuth2User
+ * @see Section 4.1 Authorization Code Grant Flow
+ * @see Section 4.1.3 Access Token Request
+ * @see Section 4.1.4 Access Token Response
+ */
+public class OAuth2LoginReactiveAuthenticationManager implements
+ ReactiveAuthenticationManager {
+ private final ReactiveOAuth2AccessTokenResponseClient accessTokenResponseClient;
+
+ private final ReactiveOAuth2UserService userService;
+
+ private final ReactiveOAuth2AuthorizedClientService authorizedClientService;
+
+ private GrantedAuthoritiesMapper authoritiesMapper = (authorities -> authorities);
+
+ public OAuth2LoginReactiveAuthenticationManager(
+ ReactiveOAuth2AccessTokenResponseClient accessTokenResponseClient,
+ ReactiveOAuth2UserService userService,
+ ReactiveOAuth2AuthorizedClientService authorizedClientService) {
+ Assert.notNull(accessTokenResponseClient, "accessTokenResponseClient cannot be null");
+ Assert.notNull(userService, "userService cannot be null");
+ Assert.notNull(authorizedClientService, "authorizedClientService");
+ this.accessTokenResponseClient = accessTokenResponseClient;
+ this.userService = userService;
+ this.authorizedClientService = authorizedClientService;
+ }
+
+ @Override
+ public Mono authenticate(Authentication authentication) {
+ return Mono.defer(() -> {
+ OAuth2LoginAuthenticationToken authorizationCodeAuthentication = (OAuth2LoginAuthenticationToken) authentication;
+
+ // Section 3.1.2.1 Authentication Request - http://openid.net/specs/openid-connect-core-1_0.html#AuthRequest
+ // scope REQUIRED. OpenID Connect requests MUST contain the "openid" scope value.
+ if (authorizationCodeAuthentication.getAuthorizationExchange()
+ .getAuthorizationRequest().getScopes().contains("openid")) {
+ // This is an OpenID Connect Authentication Request so return null
+ // and let OidcAuthorizationCodeReactiveAuthenticationManager handle it instead once one is created
+ // FIXME: Once we create OidcAuthorizationCodeReactiveAuthenticationManager uncomment below
+// return Mono.empty();
+ }
+
+ OAuth2AuthorizationExchangeValidator.validate(authorizationCodeAuthentication.getAuthorizationExchange());
+
+ OAuth2AuthorizationCodeGrantRequest authzRequest = new OAuth2AuthorizationCodeGrantRequest(
+ authorizationCodeAuthentication.getClientRegistration(),
+ authorizationCodeAuthentication.getAuthorizationExchange());
+
+ return this.accessTokenResponseClient.getTokenResponse(authzRequest)
+ .flatMap(accessTokenResponse -> authenticationResult(authorizationCodeAuthentication, accessTokenResponse));
+ });
+ }
+
+ private Mono authenticationResult(OAuth2LoginAuthenticationToken authorizationCodeAuthentication, OAuth2AccessTokenResponse accessTokenResponse) {
+ OAuth2AccessToken accessToken = accessTokenResponse.getAccessToken();
+ OAuth2UserRequest userRequest = new OAuth2UserRequest(authorizationCodeAuthentication.getClientRegistration(), accessToken);
+ return this.userService.loadUser(userRequest)
+ .flatMap(oauth2User -> {
+ Collection extends GrantedAuthority> mappedAuthorities =
+ this.authoritiesMapper.mapAuthorities(oauth2User.getAuthorities());
+
+ OAuth2LoginAuthenticationToken authenticationResult = new OAuth2LoginAuthenticationToken(
+ authorizationCodeAuthentication.getClientRegistration(),
+ authorizationCodeAuthentication.getAuthorizationExchange(),
+ oauth2User,
+ mappedAuthorities,
+ accessToken);
+ OAuth2AuthorizedClient authorizedClient = new OAuth2AuthorizedClient(
+ authenticationResult.getClientRegistration(),
+ authenticationResult.getName(),
+ authenticationResult.getAccessToken());
+ OAuth2AuthenticationToken result = new OAuth2AuthenticationToken(
+ authenticationResult.getPrincipal(),
+ authenticationResult.getAuthorities(),
+ authenticationResult.getClientRegistration().getRegistrationId());
+ return this.authorizedClientService.saveAuthorizedClient(authorizedClient, authenticationResult)
+ .thenReturn(result);
+ });
+ }
+}
diff --git a/oauth2/oauth2-client/src/test/java/org/springframework/security/oauth2/client/authentication/OAuth2LoginReactiveAuthenticationManagerTests.java b/oauth2/oauth2-client/src/test/java/org/springframework/security/oauth2/client/authentication/OAuth2LoginReactiveAuthenticationManagerTests.java
new file mode 100644
index 0000000000..cbc24b4606
--- /dev/null
+++ b/oauth2/oauth2-client/src/test/java/org/springframework/security/oauth2/client/authentication/OAuth2LoginReactiveAuthenticationManagerTests.java
@@ -0,0 +1,199 @@
+/*
+ * Copyright 2002-2018 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
+ *
+ * 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.springframework.security.oauth2.client.authentication;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatCode;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.when;
+
+import java.util.Collections;
+
+import org.junit.Before;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+import org.springframework.security.authentication.TestingAuthenticationToken;
+import org.springframework.security.core.authority.AuthorityUtils;
+import org.springframework.security.oauth2.client.ReactiveOAuth2AuthorizedClientService;
+import org.springframework.security.oauth2.client.endpoint.OAuth2AuthorizationCodeGrantRequest;
+import org.springframework.security.oauth2.client.endpoint.ReactiveOAuth2AccessTokenResponseClient;
+import org.springframework.security.oauth2.client.registration.ClientRegistration;
+import org.springframework.security.oauth2.client.userinfo.OAuth2UserRequest;
+import org.springframework.security.oauth2.client.userinfo.ReactiveOAuth2UserService;
+import org.springframework.security.oauth2.core.AuthorizationGrantType;
+import org.springframework.security.oauth2.core.ClientAuthenticationMethod;
+import org.springframework.security.oauth2.core.OAuth2AccessToken;
+import org.springframework.security.oauth2.core.OAuth2AuthenticationException;
+import org.springframework.security.oauth2.core.endpoint.OAuth2AccessTokenResponse;
+import org.springframework.security.oauth2.core.endpoint.OAuth2AuthorizationExchange;
+import org.springframework.security.oauth2.core.endpoint.OAuth2AuthorizationRequest;
+import org.springframework.security.oauth2.core.endpoint.OAuth2AuthorizationResponse;
+import org.springframework.security.oauth2.core.user.DefaultOAuth2User;
+import org.springframework.security.oauth2.core.user.OAuth2User;
+
+import reactor.core.publisher.Mono;
+
+
+/**
+ * @author Rob Winch
+ * @since 5.1
+ */
+@RunWith(MockitoJUnitRunner.class)
+public class OAuth2LoginReactiveAuthenticationManagerTests {
+ @Mock
+ private ReactiveOAuth2UserService userService;
+
+ @Mock
+ private ReactiveOAuth2AccessTokenResponseClient accessTokenResponseClient;
+
+ @Mock
+ private ReactiveOAuth2AuthorizedClientService authorizedClientService;
+
+ private ClientRegistration.Builder registration = ClientRegistration.withRegistrationId("github")
+ .redirectUriTemplate("{baseUrl}/{action}/oauth2/code/{registrationId}")
+ .clientAuthenticationMethod(ClientAuthenticationMethod.BASIC)
+ .authorizationGrantType(AuthorizationGrantType.AUTHORIZATION_CODE)
+ .scope("read:user")
+ .authorizationUri("https://github.com/login/oauth/authorize")
+ .tokenUri("https://github.com/login/oauth/access_token")
+ .userInfoUri("https://api.github.com/user")
+ .userNameAttributeName("id")
+ .clientName("GitHub")
+ .clientId("clientId")
+ .jwkSetUri("https://example.com/oauth2/jwk")
+ .clientSecret("clientSecret");
+
+ OAuth2AuthorizationResponse.Builder authorizationResponseBldr = OAuth2AuthorizationResponse
+ .success("code")
+ .state("state");
+
+ private OAuth2LoginReactiveAuthenticationManager manager;
+
+ @Before
+ public void setup() {
+ this.manager = new OAuth2LoginReactiveAuthenticationManager(this.accessTokenResponseClient, this.userService,
+ this.authorizedClientService);
+ when(this.authorizedClientService.saveAuthorizedClient(any(), any())).thenReturn(Mono.empty());
+ }
+
+ @Test
+ public void constructorWhenNullAccessTokenResponseClientThenIllegalArgumentException() {
+ this.accessTokenResponseClient = null;
+ assertThatThrownBy(() -> new OAuth2LoginReactiveAuthenticationManager(this.accessTokenResponseClient, this.userService,
+ this.authorizedClientService))
+ .isInstanceOf(IllegalArgumentException.class);
+ }
+
+ @Test
+ public void constructorWhenNullUserServiceThenIllegalArgumentException() {
+ this.userService = null;
+ assertThatThrownBy(() -> new OAuth2LoginReactiveAuthenticationManager(this.accessTokenResponseClient, this.userService,
+ this.authorizedClientService))
+ .isInstanceOf(IllegalArgumentException.class);
+ }
+
+ @Test
+ public void constructorWhenNullAuthorizedClientServiceThenIllegalArgumentException() {
+ this.authorizedClientService = null;
+ assertThatThrownBy(() -> new OAuth2LoginReactiveAuthenticationManager(this.accessTokenResponseClient, this.userService,
+ this.authorizedClientService))
+ .isInstanceOf(IllegalArgumentException.class);
+ }
+
+ @Test
+ public void authenticateWhenNoSubscriptionThenDoesNothing() {
+ // we didn't do anything because it should cause a ClassCastException (as verified below)
+ TestingAuthenticationToken token = new TestingAuthenticationToken("a", "b");
+
+ assertThatCode(()-> this.manager.authenticate(token))
+ .doesNotThrowAnyException();
+
+ assertThatThrownBy(() -> this.manager.authenticate(token).block())
+ .isInstanceOf(Throwable.class);
+ }
+
+ @Test
+ @Ignore
+ public void authenticationWhenOidcThenEmpty() {
+ this.registration.scope("openid");
+ assertThat(this.manager.authenticate(loginToken()).block()).isNull();
+ }
+
+ @Test
+ public void authenticationWhenErrorThenOAuth2AuthenticationException() {
+ this.authorizationResponseBldr = OAuth2AuthorizationResponse
+ .error("error")
+ .state("state");
+ assertThatThrownBy(() -> this.manager.authenticate(loginToken()).block())
+ .isInstanceOf(OAuth2AuthenticationException.class);
+ }
+
+ @Test
+ public void authenticationWhenStateDoesNotMatchThenOAuth2AuthenticationException() {
+ this.authorizationResponseBldr.state("notmatch");
+ assertThatThrownBy(() -> this.manager.authenticate(loginToken()).block())
+ .isInstanceOf(OAuth2AuthenticationException.class);
+ }
+
+ @Test
+ public void authenticationWhenOAuth2UserNotFoundThenEmpty() {
+ OAuth2AccessTokenResponse accessTokenResponse = OAuth2AccessTokenResponse.withToken("foo")
+ .tokenType(OAuth2AccessToken.TokenType.BEARER)
+ .build();
+ when(this.accessTokenResponseClient.getTokenResponse(any())).thenReturn(Mono.just(accessTokenResponse));
+ when(this.userService.loadUser(any())).thenReturn(Mono.empty());
+ assertThat(this.manager.authenticate(loginToken()).block()).isNull();
+ }
+
+ @Test
+ public void authenticationWhenOAuth2UserNotFoundThenSuccess() {
+ OAuth2AccessTokenResponse accessTokenResponse = OAuth2AccessTokenResponse.withToken("foo")
+ .tokenType(OAuth2AccessToken.TokenType.BEARER)
+ .build();
+ when(this.accessTokenResponseClient.getTokenResponse(any())).thenReturn(Mono.just(accessTokenResponse));
+ DefaultOAuth2User user = new DefaultOAuth2User(AuthorityUtils.createAuthorityList("ROLE_USER"), Collections.singletonMap("user", "rob"), "user");
+ when(this.userService.loadUser(any())).thenReturn(Mono.just(user));
+
+ OAuth2AuthenticationToken result = (OAuth2AuthenticationToken) this.manager.authenticate(loginToken()).block();
+
+ assertThat(result.getPrincipal()).isEqualTo(user);
+ assertThat(result.getAuthorities()).containsOnlyElementsOf(user.getAuthorities());
+ assertThat(result.isAuthenticated()).isTrue();
+ }
+
+ private OAuth2LoginAuthenticationToken loginToken() {
+ ClientRegistration clientRegistration = this.registration.build();
+ OAuth2AuthorizationRequest authorizationRequest = OAuth2AuthorizationRequest
+ .authorizationCode()
+ .state("state")
+ .clientId(clientRegistration.getClientId())
+ .authorizationUri(clientRegistration.getProviderDetails().getAuthorizationUri())
+ .redirectUri(clientRegistration.getRedirectUriTemplate())
+ .scopes(clientRegistration.getScopes())
+ .build();
+ OAuth2AuthorizationResponse authorizationResponse = this.authorizationResponseBldr
+ .redirectUri(clientRegistration.getRedirectUriTemplate())
+ .build();
+ OAuth2AuthorizationExchange authorizationExchange = new OAuth2AuthorizationExchange(authorizationRequest,
+ authorizationResponse);
+ return new OAuth2LoginAuthenticationToken(clientRegistration, authorizationExchange);
+ }
+}