[backend/api] Fix emoji import request size limiter not being disabled

Iceshrimp.Backend/Controllers/Shared/Attributes/DisableRequestSizeLimit.cs

@@ -0,0 +1,28 @@
+using Microsoft.AspNetCore.Http.Features;
+using Microsoft.AspNetCore.Http.Metadata;
+using Microsoft.AspNetCore.Mvc.Filters;
+
+namespace Iceshrimp.Backend.Controllers.Shared.Attributes;
+
+public class NoRequestSizeLimitAttribute : Attribute, IFormOptionsMetadata, IResourceFilter
+{
+	public void OnResourceExecuting(ResourceExecutingContext context)
+	{
+		var feature = context.HttpContext.Features.Get<IHttpMaxRequestBodySizeFeature>() ??
+		              throw new Exception("Failed to get IHttpMaxRequestBodySizeFeature");
+		feature.MaxRequestBodySize = long.MaxValue;
+	}
+
+	public void OnResourceExecuted(ResourceExecutedContext context) { }
+
+	public bool? BufferBody                   => null;
+	public int?  MemoryBufferThreshold        => null;
+	public long? BufferBodyLengthLimit        => long.MaxValue;
+	public int?  ValueCountLimit              => null;
+	public int?  KeyLengthLimit               => null;
+	public int?  ValueLengthLimit             => null;
+	public int?  MultipartBoundaryLengthLimit => null;
+	public int?  MultipartHeadersCountLimit   => null;
+	public int?  MultipartHeadersLengthLimit  => null;
+	public long? MultipartBodyLengthLimit     => long.MaxValue;
+}

Iceshrimp.Backend/Controllers/Web/EmojiController.cs

@@ -187,7 +187,7 @@ public class EmojiController(
 
 	[HttpPost("import")]
 	[Authorize("role:moderator")]
-	[DisableRequestSizeLimit]
+	[NoRequestSizeLimit]
 	[ProducesResults(HttpStatusCode.Accepted)]
 	public async Task<AcceptedResult> ImportEmoji(IFormFile file)
 	{