feat: 消息聊天最近列表支持删除会话

src/main/java/com/filesystem/controller/MessageController.java

@@ -276,4 +276,12 @@ public class MessageController {
         messageService.markAsRead(id);
         return ResponseEntity.ok(Map.of("message", "已标记已读"));
     }
+
+    @DeleteMapping("/conversation/{withUserId}")
+    public ResponseEntity<?> deleteConversation(
+            @AuthenticationPrincipal UserPrincipal principal,
+            @PathVariable Long withUserId) {
+        messageService.deleteConversation(principal.getUserId(), withUserId);
+        return ResponseEntity.ok(Map.of("message", "已删除"));
+    }
 }

src/main/java/com/filesystem/service/MessageService.java

@@ -4,6 +4,8 @@ import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.filesystem.entity.Message;
 import com.filesystem.mapper.MessageMapper;
 import jakarta.annotation.Resource;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.redis.core.StringRedisTemplate;
 import org.springframework.stereotype.Service;
 
 import java.util.*;
@@ -14,8 +16,16 @@ public class MessageService {
     
     @Resource
     private MessageMapper messageMapper;
+
+    @Autowired
+    private StringRedisTemplate redisTemplate;
+
+    private static final String CONV_DELETED_KEY = "msg:del:";
     
     public List<Message> getMessages(Long userId1, Long userId2) {
+        String convKey = buildConvKey(userId1, userId2);
+        String deletedKey = CONV_DELETED_KEY + userId1 + ":" + convKey;
+
         return messageMapper.selectList(
             new LambdaQueryWrapper<Message>()
                 .and(wrapper -> wrapper
@@ -26,6 +36,31 @@ public class MessageService {
                 .orderByAsc(Message::getCreateTime)
         );
     }
+
+    /**
+     * 删除与某个用户的聊天记录（双向，本人会看不到）
+     */
+    public void deleteConversation(Long userId, Long withUserId) {
+        String convKey = buildConvKey(userId, withUserId);
+        String deletedKey = CONV_DELETED_KEY + userId + ":" + convKey;
+        // 保留7天
+        redisTemplate.opsForValue().set(deletedKey, "1", java.time.Duration.ofDays(7));
+    }
+
+    /**
+     * 检查与某人的对话是否已被当前用户删除
+     */
+    public boolean isConversationDeleted(Long userId, Long withUserId) {
+        String convKey = buildConvKey(userId, withUserId);
+        String deletedKey = CONV_DELETED_KEY + userId + ":" + convKey;
+        return Boolean.TRUE.equals(redisTemplate.hasKey(deletedKey));
+    }
+
+    private String buildConvKey(Long userId1, Long userId2) {
+        long min = Math.min(userId1, userId2);
+        long max = Math.max(userId1, userId2);
+        return min + "_" + max;
+    }
     
     public Message sendMessage(Long fromUserId, Long toUserId, String content, String type) {
         Message message = new Message();