fix: align backend APIs and upload flow

MessageService.WebApi/Controllers/Message/MessageController.cs

@@ -37,11 +37,24 @@ namespace MessageService.WebApi.Controllers.Message
         }
 
         [HttpGet]
-        public async Task<IActionResult> GetMessages([FromQuery]Guid conversationId, long? cursor, int direction, int limit)
+        public async Task<IActionResult> GetMessages([FromQuery]Guid conversationId, long? cursor, int direction, int limit, CancellationToken cancellationToken)
         {
             var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);
             var command = new GetMessageCommand(conversationId, Guid.Parse(userId), cursor, direction, limit);
-            return Ok(await service.GetMessagesAsync(command));
+            return Ok(await service.GetMessagesAsync(command, cancellationToken));
+        }
+
+        [HttpGet]
+        public async Task<IActionResult> Search(
+            [FromQuery] Guid conversationId,
+            [FromQuery] string keyword,
+            long? cursor,
+            int limit = 30,
+            CancellationToken cancellationToken = default)
+        {
+            var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);
+            var command = new SearchMessageCommand(conversationId, Guid.Parse(userId!), keyword, cursor, limit);
+            return Ok(await service.SearchMessagesAsync(command, cancellationToken));
         }
     }
 }