add(IFriendService)：完善好友关系接口

backend/IM_API/Dtos/HandleFriendRequestDto.cs

@@ -0,0 +1,25 @@
+namespace IM_API.Dtos
+{
+    public class HandleFriendRequestDto
+    {
+        /// <summary>
+        /// 好友请求Id
+        /// </summary>
+        public int RequestId { get; set; }
+        /// <summary>
+        /// 处理操作
+        /// </summary>
+        public HandleFriendRequestAction Action { get; set; }
+    }
+    public enum HandleFriendRequestAction
+    {
+        /// <summary>
+        /// 同意
+        /// </summary>
+        Accept = 0,
+        /// <summary>
+        /// 拒绝
+        /// </summary>
+        Reject = 1
+    }
+}

backend/IM_API/Interface/Services/IFriendSerivce.cs

@@ -28,5 +28,37 @@ namespace IM_API.Interface.Services
         /// <param name="limit"></param>
         /// <returns></returns>
         Task<FriendRequest> GetFriendRequestListAsync(int userId,bool isReceived,int page,int limit);
+        /// <summary>
+        /// 处理好友请求
+        /// </summary>
+        /// <param name="requestDto"></param>
+        /// <returns></returns>
+        Task<bool> HandleFriendRequestAsync(HandleFriendRequestDto requestDto);
+        /// <summary>
+        /// 通过用户Id删除好友关系
+        /// </summary>
+        /// <param name="userId">操作用户Id</param>
+        /// <param name="toUserId">被删除用户ID</param>
+        /// <returns></returns>
+        Task<bool> DeleteFriendByUserIdAsync(int userId,int toUserId);
+        /// <summary>
+        /// 通过好友关系Id删除好友关系
+        /// </summary>
+        /// <param name="friendId">好友关系id</param>
+        /// <returns></returns>
+        Task<bool> DeleteFriendAsync(int friendId);
+        /// <summary>
+        /// 通过用户Id拉黑好友关系
+        /// </summary>
+        /// <param name="userId">操作用户Id</param>
+        /// <param name="toUserId">被拉黑用户ID</param>
+        /// <returns></returns>
+        Task<bool> BlockFriendByUserIdAsync(int userId, int toUserId);
+        /// <summary>
+        /// 通过好友关系Id拉黑好友关系
+        /// </summary>
+        /// <param name="friendId">好友关系id</param>
+        /// <returns></returns>
+        Task<bool> BlockeFriendAsync(int friendId);
     }
 }