添加配置，当删除用户时是否保留用户昵称

broker/config/wildfirechat.conf

@@ -157,6 +157,9 @@ group.visible_quit_or_kickoff_notification 0
 ## 注意，修改本配置不会对已经同步的信息产生影响。
 #user.hide_properties 3,4,5
 
+## 销毁用户时，用户信息会被清空，deleted字段设置为1，这个开关控制是否保留用户昵称，默认为true。
+user.keep_display_name_when_destroy true
+
 # 好友/好友请求/用户设置 这三类数据同步的最大条目数。之前是客户第一次登录时，会把所有的对应数据一次下载到客户端，但如果有特别多的信息，会导致无法同步到客户端，
 # 因此需要分段多次同步，此开关定义了每次同步的数据的条数。此需要客户端支持，客户端SDK在2021.5.25日后支持此功能。如果确认所有客户端都在这个日志之后才可以打开此设置。
 #sync.data_part_size 1000

broker/src/main/java/io/moquette/BrokerConstants.java

@@ -160,6 +160,8 @@ public final class BrokerConstants {
     public static final String GROUP_Visible_Quit_Kickoff_Notification = "group.visible_quit_or_kickoff_notification";
 
     public static final String USER_HIDE_PROPERTIES = "user.hide_properties";
+    public static final String USER_KEEP_DISPLAY_NAME_WHEN_DESTROY = "user.keep_display_name_when_destroy";
+
     public static final String SYNC_Data_Part_Size = "sync.data_part_size";
 
     public static final String MESSAGES_FORBIDDEN_CLIENT_SEND_TYPES = "message.forbidden_client_send_types";

broker/src/main/java/io/moquette/imhandler/DestroyUserHandler.java

@@ -11,9 +11,7 @@ package io.moquette.imhandler;
 import cn.wildfirechat.common.ErrorCode;
 import cn.wildfirechat.proto.ProtoConstants;
 import cn.wildfirechat.proto.WFCMessage;
-import io.moquette.persistence.MemorySessionStore;
 import io.moquette.spi.impl.Qos1PublishHandler;
-import io.moquette.spi.impl.security.TokenAuthenticator;
 import io.netty.buffer.ByteBuf;
 import win.liyufan.im.IMTopic;
 
@@ -30,7 +28,7 @@ public class DestroyUserHandler extends IMHandler<WFCMessage.IDBuf> {
                 m_messagesStore.clearUserFriend(fromUser);
                 m_messagesStore.clearUserGroups(fromUser);
                 m_messagesStore.clearUserChannels(fromUser);
-                m_messagesStore.destoryUser(fromUser);
+                m_messagesStore.destroyUser(fromUser);
 
                 m_messagesStore.destroyRobot(fromUser);
             });

broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java

@@ -160,6 +160,7 @@ public class MemoryMessagesStore implements IMessagesStore {
     private boolean mGroupAllowRobotCustomOperationNotification;
     private int mGroupVisibleQuitKickoffNotification;
     private int mSyncDataPartSize = 0;
+    private boolean keepDisplayNameWhenDestroyUser = true;
 
     private Set<Integer> mUserHideProperties = new HashSet<>();
 
@@ -418,6 +419,11 @@ public class MemoryMessagesStore implements IMessagesStore {
             mSyncDataPartSize = Integer.parseInt(server.getConfig().getProperty(SYNC_Data_Part_Size, "0"));
         } catch (Exception e) {
 
+        }
+        try {
+            keepDisplayNameWhenDestroyUser = Boolean.parseBoolean(server.getConfig().getProperty(USER_KEEP_DISPLAY_NAME_WHEN_DESTROY, "true"));
+        } catch (Exception e) {
+
         }
 
 
@@ -2487,25 +2493,41 @@ public class MemoryMessagesStore implements IMessagesStore {
     }
 
     @Override
-    public void destoryUser(String userId) {
+    public void destroyUser(String userId) {
         HazelcastInstance hzInstance = m_Server.getHazelcastInstance();
         IMap<String, WFCMessage.User> mUserMap = hzInstance.getMap(USERS);
         WFCMessage.User us = mUserMap.get(userId);
         if (us != null) {
-            us = WFCMessage.User.newBuilder()
-                .setUid(userId)
-                .setUpdateDt(System.currentTimeMillis())
-                .setName(userId)
-                .setDeleted(1)
-                .clearDisplayName()
-                .clearAddress()
-                .clearCompany()
-                .clearEmail()
-                .clearExtra()
-                .clearMobile()
-                .clearPortrait()
-                .clearSocial()
-                .build();
+            if (keepDisplayNameWhenDestroyUser) {
+                us = WFCMessage.User.newBuilder()
+                    .setUid(userId)
+                    .setUpdateDt(System.currentTimeMillis())
+                    .setName(userId)
+                    .setDeleted(1)
+                    .clearAddress()
+                    .clearCompany()
+                    .clearEmail()
+                    .clearExtra()
+                    .clearMobile()
+                    .clearPortrait()
+                    .clearSocial()
+                    .build();
+            } else {
+                us = WFCMessage.User.newBuilder()
+                    .setUid(userId)
+                    .setUpdateDt(System.currentTimeMillis())
+                    .setName(userId)
+                    .setDeleted(1)
+                    .clearDisplayName()
+                    .clearAddress()
+                    .clearCompany()
+                    .clearEmail()
+                    .clearExtra()
+                    .clearMobile()
+                    .clearPortrait()
+                    .clearSocial()
+                    .build();
+            }
 
             try {
                 databaseStore.updateUser(us);

broker/src/main/java/io/moquette/spi/IMessagesStore.java

@@ -150,7 +150,7 @@ public interface IMessagesStore {
 
     ErrorCode updateUserInfo(InputOutputUserInfo userInfo, int flag);
     void addUserInfo(WFCMessage.User user, String password) throws Exception;
-    void destoryUser(String userId);
+    void destroyUser(String userId);
     void updateUserInfo(WFCMessage.User user) throws Exception;
     WFCMessage.User getUserInfo(String userId);
     WFCMessage.User getUserInfoByName(String name);