feat: valid file filter

src/RookieShop.ApiService/Filters/FileValidationFilter.cs

@@ -0,0 +1,41 @@
+using FluentValidation;
+
+namespace RookieShop.ApiService.Filters;
+
+public sealed class FileValidationFilter : IEndpointFilter
+{
+    private const int MaxFileSize = 1048576;
+
+    public async ValueTask<object?> InvokeAsync(EndpointFilterInvocationContext context, EndpointFilterDelegate next)
+    {
+        var request = context.HttpContext.Request;
+        var formCollection = await request.ReadFormAsync();
+        var files = formCollection.Files;
+
+        if (files.Count == 0)
+            return await next(context);
+
+        foreach (var file in files)
+        {
+            switch (file.Length)
+            {
+                case 0:
+                    context.HttpContext.Response.StatusCode = StatusCodes.Status400BadRequest;
+                    throw new ValidationException("File is empty.");
+                case > MaxFileSize:
+                    context.HttpContext.Response.StatusCode = StatusCodes.Status400BadRequest;
+                    throw new ValidationException($"File size is too large. Max file size is {MaxFileSize / 1024} KB.");
+            }
+
+            List<string> allowedExtensions = [".jpg", ".jpeg", ".png"];
+            var extension = Path.GetExtension(file.FileName);
+
+            if (allowedExtensions.Contains(extension)) continue;
+
+            context.HttpContext.Response.StatusCode = StatusCodes.Status400BadRequest;
+            throw new ValidationException($"File extension {extension} is not allowed.");
+        }
+
+        return await next(context);
+    }
+}

src/RookieShop.ApiService/Filters/IdempotencyFilter.cs

@@ -3,7 +3,7 @@
 
 namespace RookieShop.ApiService.Filters;
 
-public class IdempotencyFilter(IRedisService redisService) : IEndpointFilter
+public sealed class IdempotencyFilter(IRedisService redisService) : IEndpointFilter
 {
     public async ValueTask<object?> InvokeAsync(EndpointFilterInvocationContext context, EndpointFilterDelegate next)
     {