Support custom rate limit reject response info

CHANGELOG.md

@@ -1,4 +1,5 @@
 # Change Log
 ---
 
+- [Feature: Support custom rate limit reject response info](https://github.com/Tencent/spring-cloud-tencent/pull/128)
 

spring-cloud-starter-tencent-polaris-ratelimit/src/main/java/com/tencent/cloud/polaris/ratelimit/config/PolarisRateLimitProperties.java

@@ -0,0 +1,71 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * 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 com.tencent.cloud.polaris.ratelimit.config;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.http.HttpStatus;
+
+/**
+ * The properties for rate limit.
+ *
+ * @author lepdou 2022-04-20
+ */
+@ConfigurationProperties("spring.cloud.polaris.ratelimit")
+public class PolarisRateLimitProperties {
+
+	/**
+	 * custom tips when reject request.
+	 */
+	private String rejectRequestTips;
+
+	/**
+	 * context file path.
+	 */
+	private String rejectRequestTipsFilePath;
+
+	/**
+	 * custom http code when reject request.
+	 */
+	private int rejectHttpCode = HttpStatus.TOO_MANY_REQUESTS.value();
+
+	public String getRejectRequestTips() {
+		return rejectRequestTips;
+	}
+
+	public void setRejectRequestTips(String rejectRequestTips) {
+		this.rejectRequestTips = rejectRequestTips;
+	}
+
+	public String getRejectRequestTipsFilePath() {
+		return rejectRequestTipsFilePath;
+	}
+
+	public void setRejectRequestTipsFilePath(String rejectRequestTipsFilePath) {
+		this.rejectRequestTipsFilePath = rejectRequestTipsFilePath;
+	}
+
+	public int getRejectHttpCode() {
+		return rejectHttpCode;
+	}
+
+	public void setRejectHttpCode(int rejectHttpCode) {
+		this.rejectHttpCode = rejectHttpCode;
+	}
+
+}

spring-cloud-starter-tencent-polaris-ratelimit/src/main/java/com/tencent/cloud/polaris/ratelimit/config/RateLimitConfiguration.java

@@ -51,6 +51,11 @@ import static javax.servlet.DispatcherType.REQUEST;
 		matchIfMissing = true)
 public class RateLimitConfiguration {
 
+	@Bean
+	public PolarisRateLimitProperties polarisRateLimitProperties() {
+		return new PolarisRateLimitProperties();
+	}
+
 	@Bean
 	@ConditionalOnMissingBean
 	public LimitAPI limitAPI(SDKContext polarisContext) {
@@ -67,8 +72,10 @@ public class RateLimitConfiguration {
 		@Bean
 		@ConditionalOnMissingBean
 		public QuotaCheckServletFilter quotaCheckFilter(LimitAPI limitAPI,
-				@Nullable PolarisRateLimiterLabelServletResolver labelResolver) {
+				@Nullable PolarisRateLimiterLabelServletResolver labelResolver,
-			return new QuotaCheckServletFilter(limitAPI, labelResolver);
+				PolarisRateLimitProperties polarisRateLimitProperties) {
+			return new QuotaCheckServletFilter(limitAPI, labelResolver,
+					polarisRateLimitProperties);
 		}
 
 		@Bean
@@ -93,8 +100,10 @@ public class RateLimitConfiguration {
 
 		@Bean
 		public QuotaCheckReactiveFilter quotaCheckReactiveFilter(LimitAPI limitAPI,
-				@Nullable PolarisRateLimiterLabelReactiveResolver labelResolver) {
+				@Nullable PolarisRateLimiterLabelReactiveResolver labelResolver,
-			return new QuotaCheckReactiveFilter(limitAPI, labelResolver);
+				PolarisRateLimitProperties polarisRateLimitProperties) {
+			return new QuotaCheckReactiveFilter(limitAPI, labelResolver,
+					polarisRateLimitProperties);
 		}
 
 	}

spring-cloud-starter-tencent-polaris-ratelimit/src/main/java/com/tencent/cloud/polaris/ratelimit/filter/QuotaCheckReactiveFilter.java

@@ -22,10 +22,14 @@ import java.nio.charset.StandardCharsets;
 import java.util.HashMap;
 import java.util.Map;
 
+import javax.annotation.PostConstruct;
+
 import com.tencent.cloud.common.metadata.MetadataContext;
+import com.tencent.cloud.polaris.ratelimit.config.PolarisRateLimitProperties;
 import com.tencent.cloud.polaris.ratelimit.constant.RateLimitConstant;
 import com.tencent.cloud.polaris.ratelimit.spi.PolarisRateLimiterLabelReactiveResolver;
 import com.tencent.cloud.polaris.ratelimit.utils.QuotaCheckUtils;
+import com.tencent.cloud.polaris.ratelimit.utils.RateLimitUtils;
 import com.tencent.polaris.ratelimit.api.core.LimitAPI;
 import com.tencent.polaris.ratelimit.api.rpc.QuotaResponse;
 import com.tencent.polaris.ratelimit.api.rpc.QuotaResultCode;
@@ -36,7 +40,6 @@ import reactor.core.publisher.Mono;
 
 import org.springframework.core.Ordered;
 import org.springframework.core.io.buffer.DataBuffer;
-import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.http.server.reactive.ServerHttpResponse;
 import org.springframework.util.CollectionUtils;
@@ -60,10 +63,21 @@ public class QuotaCheckReactiveFilter implements WebFilter, Ordered {
 
 	private final PolarisRateLimiterLabelReactiveResolver labelResolver;
 
+	private final PolarisRateLimitProperties polarisRateLimitProperties;
+
+	private String rejectTips;
+
 	public QuotaCheckReactiveFilter(LimitAPI limitAPI,
-			PolarisRateLimiterLabelReactiveResolver labelResolver) {
+			PolarisRateLimiterLabelReactiveResolver labelResolver,
+			PolarisRateLimitProperties polarisRateLimitProperties) {
 		this.limitAPI = limitAPI;
 		this.labelResolver = labelResolver;
+		this.polarisRateLimitProperties = polarisRateLimitProperties;
+	}
+
+	@PostConstruct
+	public void init() {
+		rejectTips = RateLimitUtils.getRejectTips(polarisRateLimitProperties);
 	}
 
 	@Override
@@ -104,11 +118,10 @@ public class QuotaCheckReactiveFilter implements WebFilter, Ordered {
 
 			if (quotaResponse.getCode() == QuotaResultCode.QuotaResultLimited) {
 				ServerHttpResponse response = exchange.getResponse();
-				response.setStatusCode(HttpStatus.TOO_MANY_REQUESTS);
+				response.setRawStatusCode(polarisRateLimitProperties.getRejectHttpCode());
 				response.getHeaders().setContentType(MediaType.APPLICATION_JSON);
 				DataBuffer dataBuffer = response.bufferFactory().allocateBuffer()
-						.write(RateLimitConstant.QUOTA_LIMITED_INFO
+						.write(rejectTips.getBytes(StandardCharsets.UTF_8));
-								.getBytes(StandardCharsets.UTF_8));
 				return response.writeWith(Mono.just(dataBuffer));
 			}
 		}

spring-cloud-starter-tencent-polaris-ratelimit/src/main/java/com/tencent/cloud/polaris/ratelimit/filter/QuotaCheckServletFilter.java

@@ -22,15 +22,18 @@ import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
 
+import javax.annotation.PostConstruct;
 import javax.servlet.FilterChain;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
 import com.tencent.cloud.common.metadata.MetadataContext;
+import com.tencent.cloud.polaris.ratelimit.config.PolarisRateLimitProperties;
 import com.tencent.cloud.polaris.ratelimit.constant.RateLimitConstant;
 import com.tencent.cloud.polaris.ratelimit.spi.PolarisRateLimiterLabelServletResolver;
 import com.tencent.cloud.polaris.ratelimit.utils.QuotaCheckUtils;
+import com.tencent.cloud.polaris.ratelimit.utils.RateLimitUtils;
 import com.tencent.polaris.ratelimit.api.core.LimitAPI;
 import com.tencent.polaris.ratelimit.api.rpc.QuotaResponse;
 import com.tencent.polaris.ratelimit.api.rpc.QuotaResultCode;
@@ -43,7 +46,6 @@ import org.springframework.util.CollectionUtils;
 import org.springframework.web.filter.OncePerRequestFilter;
 
 import static com.tencent.cloud.polaris.ratelimit.constant.RateLimitConstant.LABEL_METHOD;
-import static org.springframework.http.HttpStatus.TOO_MANY_REQUESTS;
 
 /**
  * Servlet filter to check quota.
@@ -60,10 +62,21 @@ public class QuotaCheckServletFilter extends OncePerRequestFilter {
 
 	private final PolarisRateLimiterLabelServletResolver labelResolver;
 
+	private final PolarisRateLimitProperties polarisRateLimitProperties;
+
+	private String rejectTips;
+
 	public QuotaCheckServletFilter(LimitAPI limitAPI,
-			PolarisRateLimiterLabelServletResolver labelResolver) {
+			PolarisRateLimiterLabelServletResolver labelResolver,
+			PolarisRateLimitProperties polarisRateLimitProperties) {
 		this.limitAPI = limitAPI;
 		this.labelResolver = labelResolver;
+		this.polarisRateLimitProperties = polarisRateLimitProperties;
+	}
+
+	@PostConstruct
+	public void init() {
+		rejectTips = RateLimitUtils.getRejectTips(polarisRateLimitProperties);
 	}
 
 	@Override
@@ -100,8 +113,8 @@ public class QuotaCheckServletFilter extends OncePerRequestFilter {
 			QuotaResponse quotaResponse = QuotaCheckUtils.getQuota(limitAPI,
 					localNamespace, localService, 1, labels, null);
 			if (quotaResponse.getCode() == QuotaResultCode.QuotaResultLimited) {
-				response.setStatus(TOO_MANY_REQUESTS.value());
+				response.setStatus(polarisRateLimitProperties.getRejectHttpCode());
-				response.getWriter().write(RateLimitConstant.QUOTA_LIMITED_INFO);
+				response.getWriter().write(rejectTips);
 			}
 			else {
 				filterChain.doFilter(request, response);

spring-cloud-starter-tencent-polaris-ratelimit/src/main/java/com/tencent/cloud/polaris/ratelimit/utils/RateLimitUtils.java

@@ -0,0 +1,70 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * 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 com.tencent.cloud.polaris.ratelimit.utils;
+
+import com.tencent.cloud.common.util.ResourceFileUtils;
+import com.tencent.cloud.polaris.ratelimit.config.PolarisRateLimitProperties;
+import com.tencent.cloud.polaris.ratelimit.constant.RateLimitConstant;
+import com.tencent.cloud.polaris.ratelimit.filter.QuotaCheckServletFilter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.springframework.util.StringUtils;
+
+/**
+ * Rate limit utils.
+ *
+ * @author lepdou 2022-04-20
+ */
+public final class RateLimitUtils {
+
+	private static final Logger LOG = LoggerFactory
+			.getLogger(QuotaCheckServletFilter.class);
+
+	private RateLimitUtils() {
+
+	}
+
+	public static String getRejectTips(
+			PolarisRateLimitProperties polarisRateLimitProperties) {
+		String tips = polarisRateLimitProperties.getRejectRequestTips();
+
+		if (!StringUtils.isEmpty(tips)) {
+			return tips;
+		}
+
+		String rejectFilePath = polarisRateLimitProperties.getRejectRequestTipsFilePath();
+		if (!StringUtils.isEmpty(rejectFilePath)) {
+			try {
+				tips = ResourceFileUtils.readFile(rejectFilePath);
+			}
+			catch (Exception e) {
+				LOG.error("[RateLimit] Read custom reject tips file error. path = {}",
+						rejectFilePath, e);
+			}
+		}
+
+		if (!StringUtils.isEmpty(tips)) {
+			return tips;
+		}
+
+		return RateLimitConstant.QUOTA_LIMITED_INFO;
+	}
+
+}

spring-cloud-starter-tencent-polaris-ratelimit/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -5,6 +5,24 @@
       "type": "java.lang.Boolean",
       "defaultValue": true,
       "description": "Enable polaris rate limit or not."
+    },
+    {
+      "name": "spring.cloud.polaris.ratelimit.rejectRequestTips",
+      "type": "java.lang.String",
+      "defaultValue": "",
+      "description": "Custom tips when reject request."
+    },
+    {
+      "name": "spring.cloud.polaris.ratelimit.rejectRequestTipsFilePath",
+      "type": "java.lang.String",
+      "defaultValue": "",
+      "description": "Custom tips file path when reject request."
+    },
+    {
+      "name": "spring.cloud.polaris.ratelimit.rejectHttpCode",
+      "type": "java.lang.Integer",
+      "defaultValue": "429",
+      "description": "Custom http code when reject request."
     }
   ]
 }

spring-cloud-tencent-commons/src/main/java/com/tencent/cloud/common/util/ResourceFileUtils.java

@@ -0,0 +1,54 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * 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 com.tencent.cloud.common.util;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+
+import org.springframework.core.io.ClassPathResource;
+
+/**
+ * Read file content from classpath resource.
+ *
+ * @author lepdou 2022-04-20
+ */
+public final class ResourceFileUtils {
+
+	private ResourceFileUtils() {
+	}
+
+	public static String readFile(String path) throws IOException {
+		StringBuilder sb = new StringBuilder();
+
+		ClassPathResource classPathResource = new ClassPathResource(path);
+
+		if (classPathResource.exists() && classPathResource.isReadable()) {
+			try (InputStream inputStream = classPathResource.getInputStream()) {
+				byte[] buffer = new byte[1024 * 10];
+				int len;
+				while ((len = inputStream.read(buffer)) != -1) {
+					sb.append(new String(buffer, 0, len, StandardCharsets.UTF_8));
+				}
+			}
+		}
+		return sb.toString();
+	}
+
+}

spring-cloud-tencent-examples/polaris-ratelimit-example/ratelimit-callee-service/pom.xml

@@ -1,27 +1,36 @@
 <?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"
+		 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">
+		 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <parent>
+	<parent>
-        <artifactId>polaris-ratelimit-example</artifactId>
+		<artifactId>polaris-ratelimit-example</artifactId>
-        <groupId>com.tencent.cloud</groupId>
+		<groupId>com.tencent.cloud</groupId>
-        <version>${revision}</version>
+		<version>${revision}</version>
-        <relativePath>../pom.xml</relativePath>
+		<relativePath>../pom.xml</relativePath>
-    </parent>
+	</parent>
-    <modelVersion>4.0.0</modelVersion>
+	<modelVersion>4.0.0</modelVersion>
 
-    <artifactId>ratelimit-callee-service</artifactId>
+	<artifactId>ratelimit-callee-service</artifactId>
 
-    <dependencies>
+	<dependencies>
-        <dependency>
+		<dependency>
-            <groupId>org.springframework.boot</groupId>
+			<groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-web</artifactId>
+			<artifactId>spring-boot-starter-web</artifactId>
-        </dependency>
+		</dependency>
 
 		<dependency>
-            <groupId>com.tencent.cloud</groupId>
+			<groupId>com.tencent.cloud</groupId>
-            <artifactId>spring-cloud-starter-tencent-polaris-ratelimit</artifactId>
+			<artifactId>spring-cloud-starter-tencent-polaris-ratelimit</artifactId>
-        </dependency>
+		</dependency>
+
+	</dependencies>
 
-    </dependencies>
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
 </project>

spring-cloud-tencent-examples/polaris-ratelimit-example/ratelimit-callee-service/src/main/resources/bootstrap.yml

@@ -10,3 +10,4 @@ spring:
       enabled: true
       ratelimit:
         enabled: true
+        rejectRequestTipsFilePath: reject-tips.html

spring-cloud-tencent-examples/polaris-ratelimit-example/ratelimit-callee-service/src/main/resources/reject-tips.html

@@ -0,0 +1,5 @@
+<h1>
+    <span color="red">
+        Custom reject content.
+    </span>
+</h1>