Make the proxy stream the initial result

Wabbajack.Downloaders.GoogleDrive/GoogleDriveDownloader.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using System.Net.Http;
 using System.Text.Encodings.Web;
@@ -63,7 +64,7 @@ public class GoogleDriveDownloader : ADownloader<DTOs.DownloadStates.GoogleDrive
         return new Uri(
             $"https://drive.google.com/uc?id={(state as DTOs.DownloadStates.GoogleDrive)?.Id}&export=download");
     }
-
+    
     public override IDownloadState? Resolve(IReadOnlyDictionary<string, string> iniData)
     {
         if (iniData.ContainsKey("directURL") && Uri.TryCreate(iniData["directURL"], UriKind.Absolute, out var uri))
@@ -72,6 +73,17 @@ public class GoogleDriveDownloader : ADownloader<DTOs.DownloadStates.GoogleDrive
     }
 
     public override Priority Priority => Priority.Normal;
+    
+    
+    public async Task<T> DownloadStream<T>(Archive archive, Func<Stream, Task<T>> fn, CancellationToken token)
+    {
+        var state = archive.State as DTOs.DownloadStates.GoogleDrive;
+        var msg = await ToMessage(state, true, token);
+        using var result = await _client.SendAsync(msg, token);
+        HttpException.ThrowOnFailure(result);
+        await using var stream = await result.Content.ReadAsStreamAsync(token);
+        return await fn(stream);
+    }
 
     public override async Task<Hash> Download(Archive archive, DTOs.DownloadStates.GoogleDrive state,
         AbsolutePath destination, IJob job, CancellationToken token)
@@ -98,7 +110,10 @@ public class GoogleDriveDownloader : ADownloader<DTOs.DownloadStates.GoogleDrive
         if (download)
         {
             var initialUrl = $"https://drive.google.com/uc?id={state.Id}&export=download";
-            using var response = await _client.GetAsync(initialUrl, token);
+            var msg = new HttpRequestMessage(HttpMethod.Get, initialUrl);
+            msg.UseChromeUserAgent();
+            
+            using var response = await _client.SendAsync(msg, token);
             var cookies = response.GetSetCookies();
             var warning = cookies.FirstOrDefault(c => c.Key.StartsWith("download_warning_"));
 
@@ -106,6 +121,8 @@ public class GoogleDriveDownloader : ADownloader<DTOs.DownloadStates.GoogleDrive
             {
                 var doc = new HtmlDocument();
                 var txt = await response.Content.ReadAsStringAsync(token);
+                if (txt.Contains("<title>Google Drive - Quota exceeded</title>"))
+                    throw new Exception("Google Drive - Quota Exceeded");
                 
                 doc.LoadHtml(txt);
 
@@ -127,13 +144,19 @@ public class GoogleDriveDownloader : ADownloader<DTOs.DownloadStates.GoogleDrive
 
             var url = $"https://drive.google.com/uc?export=download&confirm={warning.Value}&id={state.Id}";
             var httpState = new HttpRequestMessage(HttpMethod.Get, url);
+            httpState.UseChromeUserAgent();
             return httpState;
         }
         else
         {
             var url = $"https://drive.google.com/file/d/{state.Id}/edit";
-            using var response = await _client.GetAsync(url, token);
+            var msg = new HttpRequestMessage(HttpMethod.Get, url);
-            return !response.IsSuccessStatusCode ? null : new HttpRequestMessage(HttpMethod.Get, url);
+            msg.UseChromeUserAgent();
+            
+            using var response = await _client.SendAsync(msg, token);
+            msg = new HttpRequestMessage(HttpMethod.Get, url);
+            msg.UseChromeUserAgent();
+            return !response.IsSuccessStatusCode ? null : msg;
         }
     }
 }

Wabbajack.Downloaders.Interfaces/IProxyable.cs

@@ -1,6 +1,12 @@
+using System;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+using Wabbajack.DTOs;
+
 namespace Wabbajack.Downloaders.Interfaces;
 
 public interface IProxyable : IUrlDownloader
 {
-    
+    public Task<T> DownloadStream<T>(Archive archive, Func<Stream, Task<T>> fn, CancellationToken token);
 }

Wabbajack.Downloaders.MediaFire/MediaFireDownloader.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using System.Net.Http;
 using System.Threading;
@@ -71,6 +72,16 @@ public class MediaFireDownloader : ADownloader<DTOs.DownloadStates.MediaFire>, I
         return ((DTOs.DownloadStates.MediaFire) state).Url;
     }
 
+    public async Task<T> DownloadStream<T>(Archive archive, Func<Stream, Task<T>> fn, CancellationToken token)
+    {
+        var state = archive.State as DTOs.DownloadStates.MediaFire;
+        var url = await Resolve(state!);
+        var msg = new HttpRequestMessage(HttpMethod.Get, url!);
+        using var result = await _httpClient.SendAsync(msg, token);
+        await using var stream = await result.Content.ReadAsStreamAsync(token);
+        return await fn(stream);
+    }
+
     public override async Task<Hash> Download(Archive archive, DTOs.DownloadStates.MediaFire state,
         AbsolutePath destination, IJob job, CancellationToken token)
     {
@@ -85,7 +96,7 @@ public class MediaFireDownloader : ADownloader<DTOs.DownloadStates.MediaFire>, I
         return await Resolve(archiveState, job, token) != null;
     }
 
-    private async Task<Uri?> Resolve(DTOs.DownloadStates.MediaFire state, IJob job, CancellationToken? token = null)
+    private async Task<Uri?> Resolve(DTOs.DownloadStates.MediaFire state, IJob? job = null, CancellationToken? token = null)
     {
         token ??= CancellationToken.None;
         using var result = await _httpClient.GetAsync(state.Url, HttpCompletionOption.ResponseHeadersRead,
@@ -93,7 +104,8 @@ public class MediaFireDownloader : ADownloader<DTOs.DownloadStates.MediaFire>, I
         if (!result.IsSuccessStatusCode)
             return null;
 
-        job.Size = result.Content.Headers.ContentLength ?? 0;
+        if (job != null) 
+            job.Size = result.Content.Headers.ContentLength ?? 0;
 
         if (result.Content.Headers.ContentType!.MediaType!.StartsWith("text/html",
             StringComparison.OrdinalIgnoreCase))

Wabbajack.Downloaders.Mega/MegaDownloader.cs

@@ -60,6 +60,16 @@ public class MegaDownloader : ADownloader<Mega>, IUrlDownloader, IProxyable
         return ((Mega) state).Url;
     }
 
+    public async Task<T> DownloadStream<T>(Archive archive, Func<Stream, Task<T>> fn, CancellationToken token)
+    {
+        var state = archive.State as Mega;
+        if (!_apiClient.IsLoggedIn)
+            await _apiClient.LoginAsync();
+        
+        await using var ins = await _apiClient.DownloadAsync(state.Url, cancellationToken: token);
+        return await fn(ins);
+    }
+
     public override async Task<Hash> Download(Archive archive, Mega state, AbsolutePath destination, IJob job,
         CancellationToken token)
     {

Wabbajack.Hashing.xxHash64/StreamExtensions.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Buffers;
 using System.IO;
 using System.Threading;
@@ -72,4 +73,57 @@ public static class StreamExtensions
 
         return new Hash(finalHash);
     }
+    
+    public static async Task<Hash> HashingCopy(this Stream inputStream, Func<Memory<byte>, Task> fn,
+        CancellationToken token)
+    {
+        using var rented = MemoryPool<byte>.Shared.Rent(1024 * 1024);
+        var buffer = rented.Memory;
+
+        var hasher = new xxHashAlgorithm(0);
+
+        var running = true;
+        ulong finalHash = 0;
+        while (running && !token.IsCancellationRequested)
+        {
+            var totalRead = 0;
+
+            while (totalRead != buffer.Length)
+            {
+                var read = await inputStream.ReadAsync(buffer.Slice(totalRead, buffer.Length - totalRead),
+                    token);
+                
+                if (read == 0)
+                {
+                    running = false;
+                    break;
+                }
+                totalRead += read;
+            }
+
+            var pendingWrite = fn(buffer[..totalRead]);
+            if (running)
+            {
+                hasher.TransformByteGroupsInternal(buffer.Span);
+                await pendingWrite;
+            }
+            else
+            {
+                var preSize = (totalRead >> 5) << 5;
+                if (preSize > 0)
+                {
+                    hasher.TransformByteGroupsInternal(buffer[..preSize].Span);
+                    finalHash = hasher.FinalizeHashValueInternal(buffer[preSize..totalRead].Span);
+                    await pendingWrite;
+                    break;
+                }
+
+                finalHash = hasher.FinalizeHashValueInternal(buffer[..totalRead].Span);
+                await pendingWrite;
+                break;
+            }
+        }
+        
+        return new Hash(finalHash);
+    }
 }

Wabbajack.Networking.Http/HttpExtension.cs

@@ -20,4 +20,10 @@ public class HttpException : Exception
 
     public string Reason { get; set; }
     public int Code { get; set; }
+
+    public static void ThrowOnFailure(HttpResponseMessage result)
+    {
+        if (result.IsSuccessStatusCode) return;
+        throw new HttpException(result);
+    }
 }

Wabbajack.Server/Controllers/Proxy.cs

@@ -3,6 +3,7 @@ using FluentFTP.Helpers;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Logging;
+using Microsoft.Net.Http.Headers;
 using Wabbajack.BuildServer;
 using Wabbajack.Downloaders;
 using Wabbajack.Downloaders.Interfaces;
@@ -107,18 +108,39 @@ public class Proxy : ControllerBase
         
         var tempFile = _tempFileManager.CreateFile(deleteOnDispose:false);
 
-        var result = await _dispatcher.Download(archive, tempFile.Path, token);
+        var proxyDownloader = _dispatcher.Downloader(archive) as IProxyable;
-        if (hash != default && result != shouldMatch)
+        await using (var of = tempFile.Path.Open(FileMode.Create, FileAccess.Write, FileShare.None))
         {
-            if (tempFile.Path.FileExists())
+            Response.StatusCode = 200;
-                tempFile.Path.Delete();
+            if (name != null)
+            {
+                Response.Headers.Add(HeaderNames.ContentDisposition, $"attachment; filename=\"{name}\"");
+            }
 
-            return BadRequest(new {Type = "Unmatching Hashes", Expected = shouldMatch.ToHex(), Found = result.ToHex()});
+            Response.Headers.Add( HeaderNames.ContentType, "application/octet-stream"  );
+            
+            var result = await proxyDownloader.DownloadStream(archive, async s => { 
+                    return await s.HashingCopy(async m =>
+                {
+                    var strmA = of.WriteAsync(m, token);
+                    await Response.Body.WriteAsync(m, token);
+                    await Response.Body.FlushAsync(token);
+                    await strmA;
+                }, token); },
+                token);
+            
+            
+            if (hash != default && result != shouldMatch)
+            {
+                if (tempFile.Path.FileExists())
+                    tempFile.Path.Delete();
+            }
         }
 
+
         await tempFile.Path.MoveToAsync(cacheFile, true, token);
 
         _logger.LogInformation("Returning proxy request for {Uri} {Size}", uri, cacheFile.Size().FileSizeToString());
-        return new PhysicalFileResult(cacheFile.ToString(), "application/binary");
+        return new EmptyResult();
     }
 }