Removes gateway integration.

Moved to gateway module see spring-cloud/spring-cloud-gateway#1976

See gh-231

Author: spencergibb

docs/src/main/asciidoc/spring-cloud-security.adoc

@@ -20,74 +20,6 @@ NOTE: All of the OAuth2 SSO and resource server features moved to Spring Boot
 in version 1.3. You can find documentation in the
 https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/[Spring Boot user guide].
 
-=== Token Relay
-
-A Token Relay is where an OAuth2 consumer acts as a Client and
-forwards the incoming token to outgoing resource requests. The
-consumer can be a pure Client (like an SSO application) or a Resource
-Server.
-
-==== Client Token Relay in Spring Cloud Gateway
-
-If your app also has a
-https://cloud.spring.io/spring-cloud-static/current/single/spring-cloud.html#_spring_cloud_gateway[Spring
-Cloud Gateway] embedded reverse proxy then you
-can ask it to forward OAuth2 access tokens downstream to the services
-it is proxying. Thus the SSO app above can be enhanced simply like
-this:
-
-.App.java
-[source,java]
-----
-@Autowired
-private TokenRelayGatewayFilterFactory filterFactory;
-
-@Bean
-public RouteLocator customRouteLocator(RouteLocatorBuilder builder) {
-    return builder.routes()
-            .route("resource", r -> r.path("/resource")
-                    .filters(f -> f.filter(filterFactory.apply()))
-                    .uri("http://localhost:9000"))
-            .build();
-}
-----
-
-or this
-
-.application.yaml
-[source,yaml]
-----
-spring:
-  cloud:
-    gateway:
-      routes:
-      - id: resource
-        uri: http://localhost:9000
-        predicates:
-        - Path=/resource
-        filters:
-        - TokenRelay=
-----
-
-and it will (in addition to logging the user in and grabbing a token)
-pass the authentication token downstream to the services (in this case
-`/resource`).
-
-To enable this for Spring Cloud Gateway add the following dependencies
-
-- `org.springframework.boot:spring-boot-starter-oauth2-client`
-- `org.springframework.cloud:spring-cloud-starter-security`
-
-How does it work?  The
-{githubmaster}/src/main/java/org/springframework/cloud/security/oauth2/gateway/TokenRelayGatewayFilterFactory.java[filter]
-extracts an access token from the currently authenticated user,
-and puts it in a request header for the downstream requests.
-
-For a full working sample see https://github.com/spring-cloud-samples/sample-gateway-oauth2login[this project].
-
-NOTE: The default implementation of `ReactiveOAuth2AuthorizedClientService` used by `TokenRelayGatewayFilterFactory`
-uses an in-memory data store.  You will need to provide your own implementation `ReactiveOAuth2AuthorizedClientService`
-if you need a more robust solution.
 
 ==== Client Token Relay
 
@@ -210,29 +142,3 @@ client that sent you the token), then you only need to create your own
 Feign clients will also pick up an interceptor that uses the
 `OAuth2ClientContext` if it is available, so they should also do a
 token relay anywhere where a `RestTemplate` would.
-
-== Configuring Authentication Downstream of a Zuul Proxy
-
-You can control the authorization behaviour downstream of an
-`@EnableZuulProxy` through the `proxy.auth.*` settings. Example:
-
-.application.yml
-[source,yaml]
-----
-proxy:
-  auth:
-    routes:
-      customers: oauth2
-      stores: passthru
-      recommendations: none
-----
-
-In this example the "customers" service gets an OAuth2 token relay,
-the "stores" service gets a passthrough (the authorization header is
-just passed downstream), and the "recommendations" service has its
-authorization header removed. The default behaviour is to do a token
-relay if there is a token available, and passthru otherwise.
-
-See
-{githubmaster}/src/main/java/org/springframework/cloud/security/oauth2/proxy/ProxyAuthenticationProperties[
-ProxyAuthenticationProperties] for full details.

spring-cloud-security/src/main/java/org/springframework/cloud/security/oauth2/gateway/TokenRelayAutoConfiguration.java

@@ -1,6 +1,5 @@
 # Autoconfig
 org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
 org.springframework.cloud.security.oauth2.SpringCloudSecurityAutoConfiguration,\
-org.springframework.cloud.security.oauth2.gateway.TokenRelayAutoConfiguration,\
 org.springframework.cloud.security.oauth2.client.OAuth2LoadBalancerClientAutoConfiguration,\
 org.springframework.cloud.security.oauth2.client.ResourceServerTokenRelayAutoConfiguration