[backend/drive] Store attachments as links if they can't be fetched for caching / further processing

Iceshrimp.Backend/Core/Services/DriveService.cs

@@ -84,6 +84,8 @@ public class DriveService(
 			if (!logExisting)
 				logger.LogDebug("Storing file {uri} for user {userId}", uri, user.Id);
 
+			try
+			{
 				var res = await httpClient.GetAsync(uri);
 
 				var request = new DriveFileCreationRequest
@@ -98,6 +100,31 @@ public class DriveService(
 				return await StoreFile(await res.Content.ReadAsStreamAsync(), user, request);
 			}
 			catch (Exception e)
+			{
+				logger.LogDebug("Failed to download file from {uri}: {error}, storing as link", uri, e.Message);
+				file = new DriveFile
+				{
+					Id             = IdHelpers.GenerateSlowflakeId(),
+					CreatedAt      = DateTime.UtcNow,
+					User           = user,
+					UserHost       = user.Host,
+					Size           = 0,
+					IsLink         = true,
+					IsSensitive    = sensitive,
+					StoredInternal = false,
+					Uri            = uri,
+					Url            = uri,
+					Name           = new Uri(uri).AbsolutePath.Split('/').LastOrDefault() ?? "",
+					Comment        = description,
+					Type           = CleanMimeType(mimeType ?? "application/octet-stream")
+				};
+
+				db.Add(file);
+				await db.SaveChangesAsync();
+				return file;
+			}
+		}
+		catch (Exception e)
 		{
 			logger.LogError("Failed to insert file {uri}: {error}", uri, e.Message);
 			return null;