pushed api files

pushed middlewares

backend/API/Middlewares/BodyCheckMiddleware.cs

@@ -0,0 +1,35 @@
+using System.Net;
+using System.Text;
+
+namespace API.Middlewares;
+
+public class BodyCheckMiddleware(RequestDelegate next)
+{
+    private readonly RequestDelegate _next = next;
+
+    public async Task InvokeAsync(HttpContext context)
+    {
+        // Only check the body for POST and PUT requests
+        if (context.Request.Method == HttpMethods.Post || context.Request.Method == HttpMethods.Put)
+        {
+            // Enable buffering so we can read the stream without issues downstream
+            context.Request.EnableBuffering();
+
+            var buffer = new byte[Convert.ToInt32(context.Request.ContentLength)];
+            await context.Request.Body.ReadAsync(buffer, 0, buffer.Length);
+            string requestBody = Encoding.UTF8.GetString(buffer);
+            context.Request.Body.Seek(0, SeekOrigin.Begin); // Reset the stream for next middleware
+
+            // Check if the body is empty
+            if (string.IsNullOrEmpty(requestBody))
+            {
+                context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
+                await context.Response.WriteAsync("Request body cannot be empty.");
+                return;
+            }
+        }
+
+        await _next(context);
+    }
+}
+