add(conversation):完善私聊好友会话服务

backend/IM_API/Services/ConversationService.cs

@@ -24,9 +24,48 @@ namespace IM_API.Services
         
         #endregion
         #region 获取用户会话列表
-        public async Task<List<Conversation>> GetConversationsAsync(int userId)
+        public async Task<List<ConversationDto>> GetConversationsAsync(int userId)
         {
-            return await _context.Conversations.Where(x => x.UserId == userId)
+            var privateQuery = from c in _context.Conversations
+                               join f in _context.Friends on new { c.UserId, c.TargetId} 
+                               equals new { UserId = f.UserId, TargetId = f.FriendId}
+                               where c.UserId == userId && c.ChatType == (int)ChatType.PRIVATE
+                               select new ConversationDto
+                               {
+                                   Id = c.Id,
+                                   UserId = c.UserId,
+                                   TargetId = c.TargetId,
+                                   LastReadMessageId = c.LastReadMessageId,
+                                   LastReadMessage = c.LastReadMessage,
+                                   UnreadCount = c.UnreadCount,
+                                   ChatType = c.ChatType,
+                                   LastMessage = c.LastMessage,
+                                   TargetAvatar = f.Avatar,
+                                   TargetName = f.RemarkName,
+                                   DateTime = c.LastMessageTime
+
+                                };
+
+            var groupQuery = from c in _context.Conversations
+                             join g in _context.Groups on c.TargetId equals g.Id
+                             where c.UserId == userId && c.ChatType == (int)ChatType.GROUP
+                             select new ConversationDto
+                             {
+                                 Id = c.Id,
+                                 UserId = c.UserId,
+                                 TargetId = c.TargetId,
+                                 LastReadMessageId = c.LastReadMessageId,
+                                 LastReadMessage = c.LastReadMessage,
+                                 UnreadCount = c.UnreadCount,
+                                 ChatType = c.ChatType,
+                                 LastMessage = c.LastMessage,
+                                 TargetAvatar = g.Avatar,
+                                 TargetName = g.Name,
+                                 DateTime = c.LastMessageTime
+                             };
+            return await privateQuery
+                .Concat(groupQuery)
+                .OrderByDescending(x => x.DateTime)
                 .ToListAsync();
         }
         #endregion
@@ -39,6 +78,15 @@ namespace IM_API.Services
             await _context.SaveChangesAsync();
             return true;
         }
+
+
         #endregion
+        public async Task<List<string>> GetUserAllStreamKeyAsync(int userId)
+        {
+            return await _context.Conversations.Where(x => x.UserId == userId)
+                .Select(x => x.StreamKey)
+                .Distinct()
+                .ToListAsync();
+        }
     }
 }