Support spring.codec.max-in-memory-size configuration for CacheRequestBodyFilter

Fixes gh-2693
Fixes gh-2797

Author: Gaurav Ojha

spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/config/GatewayAutoConfiguration.java

@@ -549,8 +549,9 @@ public ModifyResponseBodyGatewayFilterFactory modifyResponseBodyGatewayFilterFac
 
 	@Bean
 	@ConditionalOnEnabledFilter
-	public CacheRequestBodyGatewayFilterFactory cacheRequestBodyGatewayFilterFactory() {
-		return new CacheRequestBodyGatewayFilterFactory();
+	public CacheRequestBodyGatewayFilterFactory cacheRequestBodyGatewayFilterFactory(
+			ServerCodecConfigurer codecConfigurer) {
+		return new CacheRequestBodyGatewayFilterFactory(codecConfigurer.getReaders());
 	}
 
 	@Bean

spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/filter/factory/CacheRequestBodyGatewayFilterFactory.java

@@ -51,6 +51,11 @@ public CacheRequestBodyGatewayFilterFactory() {
 		this.messageReaders = HandlerStrategies.withDefaults().messageReaders();
 	}
 
+	public CacheRequestBodyGatewayFilterFactory(List<HttpMessageReader<?>> messageReaders) {
+		super(CacheRequestBodyGatewayFilterFactory.Config.class);
+		this.messageReaders = messageReaders;
+	}
+
 	@Override
 	public GatewayFilter apply(CacheRequestBodyGatewayFilterFactory.Config config) {
 		return new GatewayFilter() {

spring-cloud-gateway-server/src/test/java/org/springframework/cloud/gateway/filter/factory/CacheRequestBodyGatewayFilterFactoryTests.java

@@ -34,7 +34,9 @@
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Import;
 import org.springframework.core.io.buffer.PooledDataBuffer;
+import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
 import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.util.StringUtils;
 import org.springframework.web.server.ServerWebExchange;
@@ -43,7 +45,7 @@
 import static org.assertj.core.api.Assertions.fail;
 import static org.springframework.boot.test.context.SpringBootTest.WebEnvironment.RANDOM_PORT;
 
-@SpringBootTest(webEnvironment = RANDOM_PORT)
+@SpringBootTest(webEnvironment = RANDOM_PORT, properties = "spring.codec.max-in-memory-size=25")
 @DirtiesContext
 public class CacheRequestBodyGatewayFilterFactoryTests extends BaseWebClientTests {
 
@@ -53,6 +55,8 @@ public class CacheRequestBodyGatewayFilterFactoryTests extends BaseWebClientTest
 
 	private static final String BODY_CACHED_EXISTS = "BODY_CACHED_EXISTS";
 
+	private static final String LARGE_BODY_VALUE = "here is request body which will cause payload size failure";
+
 	@Test
 	public void cacheRequestBodyWorks() {
 		testClient.post().uri("/post").header("Host", "www.cacherequestbody.org").bodyValue(BODY_VALUE).exchange()
@@ -65,6 +69,14 @@ public void cacheRequestBodyWorks() {
 				});
 	}
 
+	@Test
+	public void cacheRequestBodyDoesntWorkForLargePayload() {
+		testClient.post().uri("/post").header("Host", "www.cacherequestbody.org")
+				.header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE).bodyValue(LARGE_BODY_VALUE)
+				.exchange().expectStatus().isEqualTo(HttpStatus.INTERNAL_SERVER_ERROR).expectBody().jsonPath("message")
+				.isEqualTo("Exceeded limit on max bytes to buffer : 25");
+	}
+
 	@Test
 	public void cacheRequestBodyEmpty() {
 		testClient.post().uri("/post").header("Host", "www.cacherequestbodyempty.org").exchange().expectStatus().isOk()