Add AllowSynchronousIOAttribute, allow creating LbpFile from request body

ProjectLighthouse/Controllers/ResourcesController.cs

@@ -7,6 +7,7 @@ using LBPUnion.ProjectLighthouse.Helpers;
 using LBPUnion.ProjectLighthouse.Serialization;
 using LBPUnion.ProjectLighthouse.Types;
 using LBPUnion.ProjectLighthouse.Types.Files;
+using Microsoft.AspNetCore.Http.Features;
 using Microsoft.AspNetCore.Mvc;
 using IOFile = System.IO.File;
 
@@ -50,14 +51,16 @@ namespace LBPUnion.ProjectLighthouse.Controllers {
 
         // TODO: check if this is a valid hash
         [HttpPost("upload/{hash}")]
+        [AllowSynchronousIo]
         public async Task<IActionResult> UploadResource(string hash) {
+
             string assetsDirectory = FileHelper.ResourcePath;
             string path = FileHelper.GetResourcePath(hash);
             
             FileHelper.EnsureDirectoryCreated(assetsDirectory);
             if(FileHelper.ResourceExists(hash)) this.Ok(); // no reason to fail if it's already uploaded
 
-            LbpFile file = new(Encoding.ASCII.GetBytes(await new StreamReader(this.Request.Body).ReadToEndAsync()));
+            LbpFile file = new(this.Request.Body);
 
             if(!FileHelper.IsFileSafe(file)) return this.UnprocessableEntity();
             

ProjectLighthouse/Helpers/AllowSynchronousIOAttribute.cs

@@ -0,0 +1,18 @@
+using System;
+using Microsoft.AspNetCore.Http.Features;
+using Microsoft.AspNetCore.Mvc.Filters;
+
+namespace LBPUnion.ProjectLighthouse.Helpers {
+    // Yoinked from https://stackoverflow.com/a/68530667
+    // Thanks to T-moty!
+    /// <summary>
+    /// Allows synchronous stream operations for this request.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
+    public class AllowSynchronousIoAttribute : ActionFilterAttribute {
+        public override void OnResultExecuting(ResultExecutingContext context) {
+            IHttpBodyControlFeature syncIoFeature = context.HttpContext.Features.Get<IHttpBodyControlFeature>();
+            if(syncIoFeature != null) syncIoFeature.AllowSynchronousIO = true;
+        }
+    }
+}

ProjectLighthouse/Types/Files/LbpFile.cs

@@ -1,10 +1,19 @@
+using System.IO;
 using LBPUnion.ProjectLighthouse.Helpers;
 
 namespace LBPUnion.ProjectLighthouse.Types.Files {
     public class LbpFile {
         public LbpFile(byte[] data) {
             this.Data = data;
-            this.FileType = FileHelper.DetermineFileType(data);
+            this.FileType = FileHelper.DetermineFileType(this.Data);
+        }
+
+        public LbpFile(Stream stream) {
+            using MemoryStream ms = new();
+            stream.CopyToAsync(ms);
+
+            this.Data = ms.ToArray();
+            this.FileType = FileHelper.DetermineFileType(this.Data);
         }
         
         /// <summary>