Expose way to add config filter (#10236)

* expose way to add config filter

* add @SInCE

* fix since time

api/src/main/java/com/alibaba/nacos/api/config/ConfigService.java

@@ -16,6 +16,7 @@
 
 package com.alibaba.nacos.api.config;
 
+import com.alibaba.nacos.api.config.filter.IConfigFilter;
 import com.alibaba.nacos.api.config.listener.Listener;
 import com.alibaba.nacos.api.exception.NacosException;
 
@@ -143,6 +144,15 @@ boolean publishConfigCas(String dataId, String group, String content, String cas
  * @return whether health
  */
  String getServerStatus();
+
+ /**
+ * add config filter.
+ * It is recommended to use {@link com.alibaba.nacos.api.config.filter.AbstractConfigFilter} to expand the filter.
+ *
+ * @param configFilter filter
+ * @since 2.3.0
+ */
+ void addConfigFilter(IConfigFilter configFilter);
 
  /**
  * Shutdown the resource service.

client/src/main/java/com/alibaba/nacos/client/config/NacosConfigService.java

@@ -20,6 +20,7 @@
 import com.alibaba.nacos.api.common.Constants;
 import com.alibaba.nacos.api.config.ConfigService;
 import com.alibaba.nacos.api.config.ConfigType;
+import com.alibaba.nacos.api.config.filter.IConfigFilter;
 import com.alibaba.nacos.api.config.listener.Listener;
 import com.alibaba.nacos.api.exception.NacosException;
 import com.alibaba.nacos.client.config.filter.impl.ConfigFilterChainManager;
@@ -247,7 +248,12 @@ public String getServerStatus() {
  return DOWN;
  }
  }
-
+
+ @Override
+ public void addConfigFilter(IConfigFilter configFilter) {
+ configFilterChainManager.addFilter(configFilter);
+ }
+
  @Override
  public void shutDown() throws NacosException {
  worker.shutdown();

client/src/main/java/com/alibaba/nacos/client/config/filter/impl/ConfigFilterChainManager.java

@@ -35,11 +35,13 @@
 public class ConfigFilterChainManager implements IConfigFilterChain {
 
  private final List<IConfigFilter> filters = new ArrayList<>();
+
+ private final Properties initProperty;
 
  public ConfigFilterChainManager(Properties properties) {
+ this.initProperty = properties;
  ServiceLoader<IConfigFilter> configFilters = ServiceLoader.load(IConfigFilter.class);
  for (IConfigFilter configFilter : configFilters) {
- configFilter.init(properties);
  addFilter(configFilter);
  }
  }
@@ -51,6 +53,8 @@ public ConfigFilterChainManager(Properties properties) {
  * @return this
  */
  public synchronized ConfigFilterChainManager addFilter(IConfigFilter filter) {
+ // init
+ filter.init(this.initProperty);
  // ordered by order value
  int i = 0;
  while (i < this.filters.size()) {