Serve files directly from cloud storage

VoidCat/Controllers/DownloadController.cs

@@ -3,7 +3,6 @@ using Microsoft.AspNetCore.Mvc;
 using VoidCat.Model;
 using VoidCat.Model.Paywall;
 using VoidCat.Services.Abstractions;
-using VoidCat.Services.Files;
 
 namespace VoidCat.Controllers;
 
@@ -41,7 +40,7 @@ public class DownloadController : Controller
         var voidFile = await SetupDownload(gid);
         if (voidFile == default) return;
 
-        var egressReq = new EgressRequest(gid, GetRanges(Request, (long) voidFile!.Metadata!.Size));
+        var egressReq = new EgressRequest(gid, GetRanges(Request, (long)voidFile!.Metadata!.Size));
         if (egressReq.Ranges.Count() > 1)
         {
             _logger.LogWarning("Multi-range request not supported!");
@@ -53,10 +52,10 @@ public class DownloadController : Controller
         }
         else if (egressReq.Ranges.Count() == 1)
         {
-            Response.StatusCode = (int) HttpStatusCode.PartialContent;
+            Response.StatusCode = (int)HttpStatusCode.PartialContent;
             if (egressReq.Ranges.Sum(a => a.Size) == 0)
             {
-                Response.StatusCode = (int) HttpStatusCode.RequestedRangeNotSatisfiable;
+                Response.StatusCode = (int)HttpStatusCode.RequestedRangeNotSatisfiable;
                 return;
             }
         }
@@ -92,7 +91,7 @@ public class DownloadController : Controller
             var orderId = Request.Headers.GetHeader("V-OrderId") ?? Request.Query["orderId"];
             if (!await IsOrderPaid(orderId))
             {
-                Response.StatusCode = (int) HttpStatusCode.PaymentRequired;
+                Response.StatusCode = (int)HttpStatusCode.PaymentRequired;
                 return default;
             }
         }

VoidCat/Model/VoidFileMeta.cs

@@ -53,6 +53,11 @@ public record VoidFileMeta : IVoidFileMeta
     /// </summary>
     public string? Digest { get; init; }
     
+    /// <summary>
+    /// Url to download the file
+    /// </summary>
+    public Uri? Url { get; set; }
+    
     /// <summary>
     /// User who uploaded the file
     /// </summary>

VoidCat/Model/VoidSettings.cs

@@ -34,6 +34,7 @@ namespace VoidCat.Model
 
     public sealed record CloudStorageSettings
     {
+        public bool ServeFromCloud { get; init; }
         public S3BlobConfig? S3 { get; set; }
     }
 

VoidCat/Services/Files/S3FileMetadataStore.cs

@@ -5,16 +5,17 @@ using VoidCat.Services.Abstractions;
 
 namespace VoidCat.Services.Files;
 
-// ReSharper disable once InconsistentNaming
 public class S3FileMetadataStore : IFileMetadataStore
 {
     private readonly ILogger<S3FileMetadataStore> _logger;
     private readonly AmazonS3Client _client;
     private readonly S3BlobConfig _config;
+    private readonly bool _includeUrl;
 
     public S3FileMetadataStore(VoidSettings settings, ILogger<S3FileMetadataStore> logger)
     {
         _logger = logger;
+        _includeUrl = settings.CloudStorage?.ServeFromCloud ?? false;
         _config = settings.CloudStorage!.S3!;
         _client = _config.CreateClient();
     }
@@ -27,7 +28,18 @@ public class S3FileMetadataStore : IFileMetadataStore
 
             using var sr = new StreamReader(obj.ResponseStream);
             var json = await sr.ReadToEndAsync();
-            return JsonConvert.DeserializeObject<TMeta>(json);
+            var ret = JsonConvert.DeserializeObject<TMeta>(json);
+            if (ret != default && _includeUrl)
+            {
+                var ub = new UriBuilder(_config.ServiceUrl!)
+                {
+                    Path = $"/{_config.BucketName}/{id}"
+                };
+
+                ret.Url = ub.Uri;
+            }
+
+            return ret;
         }
         catch (AmazonS3Exception aex)
         {

VoidCat/Services/Files/S3FileStore.cs

@@ -5,7 +5,6 @@ using VoidCat.Services.Abstractions;
 
 namespace VoidCat.Services.Files;
 
-// ReSharper disable once InconsistentNaming
 public class S3FileStore : StreamFileStore, IFileStore
 {
     private readonly IFileInfoManager _fileInfo;

VoidCat/spa/src/FilePreview.js

@@ -114,13 +114,14 @@ export function FilePreview() {
 
     useEffect(() => {
         if (info) {
+            let fileLink = info.metadata?.url ?? `${ApiHost}/d/${info.id}`;
             let order = window.localStorage.getItem(`paywall-${info.id}`);
             if (order) {
                 let orderObj = JSON.parse(order);
                 setOrder(orderObj);
-                setLink(`${ApiHost}/d/${info.id}?orderId=${orderObj.id}`);
+                setLink(`${fileLink}?orderId=${orderObj.id}`);
             } else {
-                setLink(`${ApiHost}/d/${info.id}`);
+                setLink(fileLink);
             }
         }
     }, [info]);