Move rate limiting examples

spring-cloud-modules/spring-cloud-gateway-2/README.md

@@ -0,0 +1,7 @@
+## Spring Cloud Gateway 2
+
+This module contains additional articles about Spring Cloud Gateway.
+
+### Relevant Articles:
+
+- [Rate Limiting With Client IP in Spring Cloud Gateway](https://www.baeldung.com/spring-cloud-gateway-rate-limit-by-client-ip)

spring-cloud-modules/spring-cloud-gateway-2/pom.xml

@@ -0,0 +1,124 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns="http://maven.apache.org/POM/4.0.0"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>spring-cloud-gateway-2</artifactId>
+    <name>spring-cloud-gateway-2</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung.spring.cloud</groupId>
+        <artifactId>spring-cloud-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.junit</groupId>
+                <artifactId>junit-bom</artifactId>
+                <version>${junit-jupiter.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <dependency>
+                <groupId>org.springframework.cloud</groupId>
+                <artifactId>spring-cloud-dependencies</artifactId>
+                <version>${spring-cloud-dependencies.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-dependencies</artifactId>
+                <version>${spring-boot.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-gateway</artifactId>
+        </dependency>
+        <!-- Redis -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-redis-reactive</artifactId>
+        </dependency>
+        <!-- Embedded Redis -->
+        <dependency>
+            <groupId>it.ozimov</groupId>
+            <artifactId>embedded-redis</artifactId>
+            <version>${redis.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.hibernate</groupId>
+            <artifactId>hibernate-validator-cdi</artifactId>
+            <version>${hibernate-validator.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>javax.validation</groupId>
+            <artifactId>validation-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-actuator</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-devtools</artifactId>
+        </dependency>
+        <!-- Spring security -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-oauth2-resource-server</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-oauth2-client</artifactId>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.8.1</version>
+                <configuration>
+                    <source>${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>
+        <hibernate-validator.version>6.0.2.Final</hibernate-validator.version>
+        <redis.version>0.7.2</redis.version>
+        <oauth2-oidc-sdk.version>9.19</oauth2-oidc-sdk.version>
+    </properties>
+
+</project>

spring-cloud-modules/spring-cloud-gateway-2/src/main/java/com/baeldung/springcloudgateway/GatewayApplication

@@ -0,0 +1,14 @@
+package com.baeldung.springcloudgateway;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.PropertySource;
+
+@SpringBootApplication
+public class GatewayApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(GatewayApplication.class, args);
+    }
+
+}

spring-cloud-modules/spring-cloud-gateway-2/src/main/java/com/baeldung/springcloudgateway/ipaddress/IpAddressApplication.java

@@ -0,0 +1,38 @@
+package com.baeldung.springcloudgateway.ipaddress;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.gateway.filter.ratelimit.RedisRateLimiter;
+import org.springframework.cloud.gateway.route.RouteLocator;
+import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.PropertySource;
+
+@SpringBootApplication()
+@PropertySource("classpath:ipaddress-application.properties")
+public class IpAddressApplication {
+    public static void main(String[] args) {
+        SpringApplication.run(IpAddressApplication.class, args);
+    }
+
+    @Bean
+    public RouteLocator myRoutes(RouteLocatorBuilder builder) {
+        return builder.routes()
+                .route("requestratelimiter_route", p -> p
+                        .path("/example")
+                        .filters(f -> f.requestRateLimiter(r -> r.setRateLimiter(redisRateLimiter())))
+                        .uri("http://example.org"))
+                .route("ipaddress_route", p -> p
+                        .path("/example2")
+                        .filters(f -> f.requestRateLimiter(r -> r.setRateLimiter(redisRateLimiter())
+                                .setDenyEmptyKey(false)
+                                .setKeyResolver(new SimpleClientAddressResolver())))
+                        .uri("http://example.org"))
+                .build();
+    }
+
+    @Bean
+    public RedisRateLimiter redisRateLimiter() {
+        return new RedisRateLimiter(1, 1, 1);
+    }
+}

spring-cloud-modules/spring-cloud-gateway-2/src/main/java/com/baeldung/springcloudgateway/ipaddress/ProxiedClientAddressResolver.java

@@ -0,0 +1,21 @@
+package com.baeldung.springcloudgateway.ipaddress;
+
+import org.springframework.cloud.gateway.filter.ratelimit.KeyResolver;
+import org.springframework.cloud.gateway.support.ipresolver.XForwardedRemoteAddressResolver;
+import org.springframework.context.annotation.Primary;
+import org.springframework.stereotype.Component;
+import org.springframework.web.server.ServerWebExchange;
+import reactor.core.publisher.Mono;
+
+import java.net.InetSocketAddress;
+
+@Primary
+@Component
+public class ProxiedClientAddressResolver implements KeyResolver {
+    @Override
+    public Mono<String> resolve(ServerWebExchange exchange) {
+        XForwardedRemoteAddressResolver resolver = XForwardedRemoteAddressResolver.maxTrustedIndex(1);
+        InetSocketAddress inetSocketAddress = resolver.resolve(exchange);
+        return Mono.just(inetSocketAddress.getAddress().getHostAddress());
+    }
+}

spring-cloud-modules/spring-cloud-gateway-2/src/main/java/com/baeldung/springcloudgateway/ipaddress/SimpleClientAddressResolver.java

@@ -0,0 +1,23 @@
+package com.baeldung.springcloudgateway.ipaddress;
+
+import org.springframework.cloud.gateway.filter.ratelimit.KeyResolver;
+import org.springframework.stereotype.Component;
+import org.springframework.web.server.ServerWebExchange;
+import reactor.core.publisher.Mono;
+
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.util.Optional;
+
+@Component
+public class SimpleClientAddressResolver implements KeyResolver {
+    @Override
+    public Mono<String> resolve(ServerWebExchange exchange) {
+        return Optional.ofNullable(exchange.getRequest().getRemoteAddress())
+                .map(InetSocketAddress::getAddress)
+                .map(InetAddress::getHostAddress)
+                .map(Mono::just)
+                .orElse(Mono.empty());
+    }
+}
+

spring-cloud-modules/spring-cloud-gateway-2/src/main/resources/ipaddress-application.properties

@@ -0,0 +1,6 @@
+server.port=8081
+spring.redis.database=0
+spring.redis.host=localhost
+spring.redis.port=16379
+spring.redis.password=mypass
+spring.redis.timeout=60000