Bael 5260 (#11712)

* [BAEL-4849] Article code

* [BAEL-4968] Article code

* [BAEL-4968] Article code

* [BAEL-4968] Article code

* [BAEL-4968] Remove extra comments

* WIP:Update to latest Boot

* WIP: Backend App

* WIP: resource server

* WIP: Change endpoint path

* WIP: Add Postman sample

* WIP: Add keycloak baeldung realm

* WIP: Change lombok scope

* WIP: Remove lombok dependency

* [BEAL-5260] README-OAuth

spring-cloud/spring-cloud-gateway/README-OAuth.md

@@ -0,0 +1,40 @@
+# OAuth Test Setup
+
+In order to test the OAuth-secured gateway configurations, please follow the steps below
+
+## Keycloak setup
+
+1. Clone or download the https://github.com/Baeldung/spring-security-oauth project
+2. Replace the file `oauth-rest/oauth-authorization-server/src/main/resources/baeldung-realm.json`
+   with the one provider here
+3. Go to the oauth-rest/oauth-authorization-server folder and use maven to build the project
+4. Run the Keycloack service with `mvn spring-boot:run`
+5. Once Keycloak is up and running, go to `http://localhost:8083/auth/admin/master/console/#/realms/baeldung` and
+   log in with using `bael-admin/pass` as credentials
+6. Create two test users, so that one belongs to the *Golden Customers* group and the other doesn't.
+
+## Quotes backend
+
+Use the provided maven profile:
+
+```
+$ mvn spring-boot:run -Pquotes-application
+```
+
+## Gateway as Resource Server
+
+Use the provided maven profile:
+
+```
+$ mvn spring-boot:run -Pgateway-as-resource-server
+```
+
+## Gateway as OAuth 2.0 Client
+
+Use the provided maven profile:
+
+```
+$ mvn spring-boot:run -Pgateway-as-oauth-client
+```
+
+

spring-cloud/spring-cloud-gateway/pom.xml

@@ -83,23 +83,99 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-devtools</artifactId>
         </dependency>
+
+        <!-- Spring security -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-oauth2-resource-server</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-oauth2-client</artifactId>
+        </dependency>
+        
     </dependencies>
 
     <build>
         <plugins>
+        <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.8.1</version>
+        <configuration>
+          <source>${java.version}</source>
+          <target>${java.version}</target>
+        </configuration>
+      </plugin>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
+                <configuration>
+                    <excludes>
+                        <exclude>
+                            <groupId>org.projectlombok</groupId>
+                            <artifactId>lombok</artifactId>
+                        </exclude>
+                    </excludes>
+                </configuration>
             </plugin>
         </plugins>
     </build>
 
     <properties>
-        <spring-cloud-dependencies.version>Hoxton.SR3</spring-cloud-dependencies.version>
+<!--         <spring-cloud-dependencies.version>Hoxton.SR3</spring-cloud-dependencies.version> -->
-        <spring-boot.version>2.2.6.RELEASE</spring-boot.version>
+<!--         <spring-boot.version>2.2.6.RELEASE</spring-boot.version> -->
         <hibernate-validator.version>6.0.2.Final</hibernate-validator.version>
         <redis.version>0.7.2</redis.version>
-        <junit-bom.version>5.5.2</junit-bom.version>
+        <oauth2-oidc-sdk.version>9.19</oauth2-oidc-sdk.version>
+<!--         <junit-bom.version>5.5.2</junit-bom.version> -->
     </properties>
     
+    <profiles>
+        <profile>
+            <id>quotes-application</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.springframework.boot</groupId>
+                        <artifactId>spring-boot-maven-plugin</artifactId>
+                        <configuration>
+                            <mainClass>com.baeldung.springcloudgateway.oauth.backend.QuotesApplication</mainClass>
+                        </configuration>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+        <profile>
+            <id>gateway-as-resource-server</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.springframework.boot</groupId>
+                        <artifactId>spring-boot-maven-plugin</artifactId>
+                        <configuration>
+                            <mainClass>com.baeldung.springcloudgateway.oauth.server.ResourceServerGatewayApplication</mainClass>
+                            <jvmArguments>-Dspring.profiles.active=resource-server</jvmArguments>
+                        </configuration>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+        <profile>
+            <id>gateway-as-oauth-client</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.springframework.boot</groupId>
+                        <artifactId>spring-boot-maven-plugin</artifactId>
+                        <configuration>
+                            <mainClass>com.baeldung.springcloudgateway.oauth.server.ResourceServerGatewayApplication</mainClass>
+                            <jvmArguments>-Dspring.profiles.active=oauth-client</jvmArguments>
+                        </configuration>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+    </profiles>
 </project>

spring-cloud/spring-cloud-gateway/src/main/java/com/baeldung/springcloudgateway/custompredicates/config/CustomPredicatesConfig.java

@@ -1,6 +1,5 @@
 package com.baeldung.springcloudgateway.custompredicates.config;
 
-import org.springframework.cloud.gateway.filter.GatewayFilter;
 import org.springframework.cloud.gateway.route.RouteLocator;
 import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;
 import org.springframework.context.annotation.Bean;
@@ -24,14 +23,20 @@ public class CustomPredicatesConfig {
     public RouteLocator routes(RouteLocatorBuilder builder, GoldenCustomerRoutePredicateFactory gf ) {
 
         return builder.routes()
-          .route("dsl_golden_route", r -> r.path("/dsl_api/**")
+          .route("dsl_golden_route", r -> 
-            .filters(f -> f.stripPrefix(1))
+            r.predicate(gf.apply(new Config(true, "customerId")))
-            .uri("https://httpbin.org")
+             .and()
-            .predicate(gf.apply(new Config(true, "customerId"))))
+             .path("/dsl_api/**")
-          .route("dsl_common_route", r -> r.path("/dsl_api/**")
+             .filters(f -> f.stripPrefix(1))
-            .filters(f -> f.stripPrefix(1))
+             .uri("https://httpbin.org")
-            .uri("https://httpbin.org")
+          )
-            .predicate(gf.apply(new Config(false, "customerId"))))             
+          .route("dsl_common_route", r -> 
+             r.predicate(gf.apply(new Config(false, "customerId")))
+              .and()
+              .path("/dsl_api/**")
+              .filters(f -> f.stripPrefix(1))
+              .uri("https://httpbin.org")
+              )             
           .build();
     }
     

spring-cloud/spring-cloud-gateway/src/main/java/com/baeldung/springcloudgateway/oauth/backend/QuotesApplication.java

@@ -0,0 +1,44 @@
+/**
+ * 
+ */
+package com.baeldung.springcloudgateway.oauth.backend;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.autoconfigure.security.oauth2.resource.OAuth2ResourceServerProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.security.config.annotation.web.reactive.EnableWebFluxSecurity;
+import org.springframework.security.oauth2.server.resource.introspection.NimbusReactiveOpaqueTokenIntrospector;
+import org.springframework.security.oauth2.server.resource.introspection.ReactiveOpaqueTokenIntrospector;
+
+import com.baeldung.springcloudgateway.oauth.shared.KeycloakReactiveTokenInstrospector;
+
+/**
+ * @author Philippe
+ *
+ */
+@SpringBootApplication
+@PropertySource("classpath:quotes-application.properties")
+@EnableWebFluxSecurity
+public class QuotesApplication {
+    
+    public static void main(String[] args) {
+        SpringApplication.run(QuotesApplication.class);
+    }
+    
+    
+    @Bean
+    public ReactiveOpaqueTokenIntrospector keycloakIntrospector(OAuth2ResourceServerProperties props) {
+        
+        NimbusReactiveOpaqueTokenIntrospector delegate = new NimbusReactiveOpaqueTokenIntrospector(
+           props.getOpaquetoken().getIntrospectionUri(),
+           props.getOpaquetoken().getClientId(),
+           props.getOpaquetoken().getClientSecret());
+        
+        return new KeycloakReactiveTokenInstrospector(delegate);
+    }
+    
+    
+}
+

spring-cloud/spring-cloud-gateway/src/main/java/com/baeldung/springcloudgateway/oauth/backend/domain/Quote.java

@@ -0,0 +1,35 @@
+package com.baeldung.springcloudgateway.oauth.backend.domain;
+
+
+public class Quote {
+    
+    private String symbol;
+    private double price;
+    
+    /**
+     * @return the symbol
+     */
+    public String getSymbol() {
+        return symbol;
+    }
+    /**
+     * @param symbol the symbol to set
+     */
+    public void setSymbol(String symbol) {
+        this.symbol = symbol;
+    }
+    /**
+     * @return the price
+     */
+    public double getPrice() {
+        return price;
+    }
+    /**
+     * @param price the price to set
+     */
+    public void setPrice(double price) {
+        this.price = price;
+    }
+
+    
+}

spring-cloud/spring-cloud-gateway/src/main/java/com/baeldung/springcloudgateway/oauth/backend/web/QuoteApi.java

@@ -0,0 +1,34 @@
+package com.baeldung.springcloudgateway.oauth.backend.web;
+
+import javax.annotation.PostConstruct;
+
+import org.springframework.security.core.GrantedAuthority;
+import org.springframework.security.core.authority.SimpleGrantedAuthority;
+import org.springframework.security.oauth2.server.resource.authentication.BearerTokenAuthentication;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.baeldung.springcloudgateway.oauth.backend.domain.Quote;
+
+import reactor.core.publisher.Mono;
+
+@RestController
+public class QuoteApi {
+    private static final GrantedAuthority GOLD_CUSTOMER = new SimpleGrantedAuthority("gold");
+
+    @GetMapping("/quotes/{symbol}")
+    public Mono<Quote> getQuote(@PathVariable("symbol") String symbol, BearerTokenAuthentication auth ) {
+        
+        Quote q = new Quote();
+        q.setSymbol(symbol);
+        
+        if ( auth.getAuthorities().contains(GOLD_CUSTOMER)) {
+            q.setPrice(10.0);
+        }
+        else {
+            q.setPrice(12.0);
+        }
+        return Mono.just(q);
+    }
+}

spring-cloud/spring-cloud-gateway/src/main/java/com/baeldung/springcloudgateway/oauth/server/ResourceServerGatewayApplication.java

@@ -0,0 +1,13 @@
+package com.baeldung.springcloudgateway.oauth.server;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.security.config.annotation.web.reactive.EnableWebFluxSecurity;
+
+@SpringBootApplication
+@EnableWebFluxSecurity
+public class ResourceServerGatewayApplication {
+    public static void main(String[] args) {
+        SpringApplication.run(ResourceServerGatewayApplication.class,args);
+    }
+}

spring-cloud/spring-cloud-gateway/src/main/java/com/baeldung/springcloudgateway/oauth/shared/KeycloakReactiveTokenInstrospector.java

@@ -0,0 +1,65 @@
+/**
+ * 
+ */
+package com.baeldung.springcloudgateway.oauth.shared;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import org.springframework.security.core.GrantedAuthority;
+import org.springframework.security.core.authority.SimpleGrantedAuthority;
+import org.springframework.security.oauth2.core.DefaultOAuth2AuthenticatedPrincipal;
+import org.springframework.security.oauth2.core.OAuth2AuthenticatedPrincipal;
+import org.springframework.security.oauth2.server.resource.introspection.ReactiveOpaqueTokenIntrospector;
+
+import reactor.core.publisher.Mono;
+
+/**
+ * Custom ReactiveTokenIntrospector to map realm roles into Spring GrantedAuthorities
+ *
+ */
+public class KeycloakReactiveTokenInstrospector implements ReactiveOpaqueTokenIntrospector {
+    
+    private final ReactiveOpaqueTokenIntrospector delegate;
+   
+    public KeycloakReactiveTokenInstrospector(ReactiveOpaqueTokenIntrospector delegate) {
+        this.delegate = delegate;
+    }
+
+    @Override
+    public Mono<OAuth2AuthenticatedPrincipal> introspect(String token) {
+        
+        return delegate.introspect(token)
+         .map( this::mapPrincipal);
+    }
+    
+    protected OAuth2AuthenticatedPrincipal mapPrincipal(OAuth2AuthenticatedPrincipal principal) {
+        
+        return new DefaultOAuth2AuthenticatedPrincipal(
+            principal.getName(),
+            principal.getAttributes(),
+            extractAuthorities(principal));
+    }
+    
+    protected Collection<GrantedAuthority> extractAuthorities(OAuth2AuthenticatedPrincipal principal) {
+        
+        //
+        Map<String,List<String>> realm_access = principal.getAttribute("realm_access");
+        List<String> roles = realm_access.getOrDefault("roles", Collections.emptyList());
+        List<GrantedAuthority> rolesAuthorities = roles.stream()
+                .map(SimpleGrantedAuthority::new)
+                .collect(Collectors.toList());
+        
+        Set<GrantedAuthority> allAuthorities = new HashSet<>();
+        allAuthorities.addAll(principal.getAuthorities());
+        allAuthorities.addAll(rolesAuthorities);
+        
+        return allAuthorities;
+    }
+
+}

spring-cloud/spring-cloud-gateway/src/main/resources/application-oauth-client.yml

@@ -0,0 +1,26 @@
+server:
+  port: 8087
+spring:
+  cloud:
+    gateway:
+      redis:
+        enabled: false
+      routes:
+      - id: quotes
+        uri: http://localhost:8085
+        predicates:
+        - Path=/quotes/**
+        filters:
        - TokenRelay=
+  security:
+    oauth2:
+      client:
        provider:
          keycloak:
+            issuer-uri: http://localhost:8083/auth/realms/baeldung
+        registration:
          quotes-client:
+            provider: keycloak
+            client-id: quotes-client
+            client-secret: 0e082231-a70d-48e8-b8a5-fbfb743041b6
+            scope:
            - email
+            - profile
+            - roles
+
+          

spring-cloud/spring-cloud-gateway/src/main/resources/application-resource-server.yml

@@ -0,0 +1,19 @@
+server:
+  port: 8086
+spring:
+  security:
+    oauth2:
+      resourceserver:
+        opaquetoken:
+          introspection-uri: http://localhost:8083/auth/realms/baeldung/protocol/openid-connect/token/introspect
+          client-id: quotes-client
+          client-secret: 0e082231-a70d-48e8-b8a5-fbfb743041b6
+  cloud:
+    gateway:
+      redis:
+        enabled: false
+      routes:
+      - id: quotes
+        uri: http://localhost:8085
+        predicates:
+        - Path=/quotes/**

spring-cloud/spring-cloud-gateway/src/main/resources/quotes-application.properties

@@ -0,0 +1,12 @@
+server.port=8085
+# Disable gateway & redis as we don't need them in this application
+spring.cloud.gateway.enabled=false
+spring.cloud.gateway.redis.enabled=false
+
+# Resource server settings
+spring.security.oauth2.resourceserver.opaquetoken.introspection-uri=http://localhost:8083/auth/realms/baeldung/protocol/openid-connect/token/introspect
+spring.security.oauth2.resourceserver.opaquetoken.client-id=quotes-client
+spring.security.oauth2.resourceserver.opaquetoken.client-secret=0e082231-a70d-48e8-b8a5-fbfb743041b6
+
+
+

spring-cloud/spring-cloud-gateway/src/test/postman/OAuth_Gateway.postman_collection.json

@@ -0,0 +1,203 @@
+{
+	"info": {
+		"_postman_id": "b3d00e23-c2cd-40ce-a90b-673efb25e5c0",
+		"name": "Baeldung - OAuth",
+		"schema": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json"
+	},
+	"item": [
+		{
+			"name": "Token",
+			"event": [
+				{
+					"listen": "test",
+					"script": {
+						"exec": [
+							"var jsonData = pm.response.json();\r",
+							"pm.environment.set(\"access_token\", jsonData.access_token);\r",
+							"pm.environment.set(\"refresh_token\", jsonData.refresh_token);\r",
+							"pm.environment.set(\"backend_token\", \"Bearer \" + jsonData.access_token);"
+						],
+						"type": "text/javascript"
+					}
+				}
+			],
+			"request": {
+				"method": "POST",
+				"header": [],
+				"body": {
+					"mode": "urlencoded",
+					"urlencoded": [
+						{
+							"key": "client_id",
+							"value": "{{client_id}}",
+							"type": "text"
+						},
+						{
+							"key": "client_secret",
+							"value": "{{client_secret}}",
+							"type": "text"
+						},
+						{
+							"key": "grant_type",
+							"value": "password",
+							"type": "text"
+						},
+						{
+							"key": "scope",
+							"value": "email roles profile",
+							"type": "text"
+						},
+						{
+							"key": "username",
+							"value": "maxwell.smart",
+							"type": "text"
+						},
+						{
+							"key": "password",
+							"value": "1234",
+							"type": "text"
+						}
+					]
+				},
+				"url": {
+					"raw": "{{keycloack_base}}/token",
+					"host": [
+						"{{keycloack_base}}"
+					],
+					"path": [
+						"token"
+					]
+				}
+			},
+			"response": []
+		},
+		{
+			"name": "Quote",
+			"protocolProfileBehavior": {
+				"disabledSystemHeaders": {
+					"accept": true
+				}
+			},
+			"request": {
+				"auth": {
+					"type": "bearer",
+					"bearer": [
+						{
+							"key": "token",
+							"value": "{{access_token}}",
+							"type": "string"
+						}
+					]
+				},
+				"method": "GET",
+				"header": [
+					{
+						"key": "Accept",
+						"value": "application/json",
+						"type": "text"
+					}
+				],
+				"url": {
+					"raw": "http://localhost:8085/quotes/:symbol",
+					"protocol": "http",
+					"host": [
+						"localhost"
+					],
+					"port": "8085",
+					"path": [
+						"quotes",
+						":symbol"
+					],
+					"variable": [
+						{
+							"key": "symbol",
+							"value": "IBM"
+						}
+					]
+				}
+			},
+			"response": []
+		},
+		{
+			"name": "Quote via Gateway",
+			"protocolProfileBehavior": {
+				"disabledSystemHeaders": {
+					"accept": true
+				}
+			},
+			"request": {
+				"auth": {
+					"type": "bearer",
+					"bearer": [
+						{
+							"key": "token",
+							"value": "{{access_token}}",
+							"type": "string"
+						}
+					]
+				},
+				"method": "GET",
+				"header": [
+					{
+						"key": "Accept",
+						"value": "application/json",
+						"type": "text"
+					}
+				],
+				"url": {
+					"raw": "http://localhost:8086/quotes/:symbol",
+					"protocol": "http",
+					"host": [
+						"localhost"
+					],
+					"port": "8086",
+					"path": [
+						"quotes",
+						":symbol"
+					],
+					"variable": [
+						{
+							"key": "symbol",
+							"value": "IBM"
+						}
+					]
+				}
+			},
+			"response": []
+		}
+	],
+	"event": [
+		{
+			"listen": "prerequest",
+			"script": {
+				"type": "text/javascript",
+				"exec": [
+					""
+				]
+			}
+		},
+		{
+			"listen": "test",
+			"script": {
+				"type": "text/javascript",
+				"exec": [
+					""
+				]
+			}
+		}
+	],
+	"variable": [
+		{
+			"key": "keycloack_base",
+			"value": "http://localhost:8083/auth/realms/baeldung/protocol/openid-connect"
+		},
+		{
+			"key": "client_id",
+			"value": "quotes-client"
+		},
+		{
+			"key": "client_secret",
+			"value": "56be94c8-b20a-4374-899c-e39cb022d3f8"
+		}
+	]
+}