1 files changed, 58 insertions, 0 deletions
diff --git a/modules/lfs/transferadapter.go b/modules/lfs/transferadapter.go
new file mode 100644
index 0000000000..ea3aff0000
--- /dev/null
+++ b/modules/lfs/transferadapter.go
@@ -0,0 +1,58 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package lfs
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+)
+
+// TransferAdapter represents an adapter for downloading/uploading LFS objects
+type TransferAdapter interface {
+	Name() string
+	Download(ctx context.Context, r *ObjectResponse) (io.ReadCloser, error)
+	//Upload(ctx context.Context, reader io.Reader) error
+}
+
+// BasicTransferAdapter implements the "basic" adapter
+type BasicTransferAdapter struct {
+	client *http.Client
+}
+
+// Name returns the name of the adapter
+func (a *BasicTransferAdapter) Name() string {
+	return "basic"
+}
+
+// Download reads the download location and downloads the data
+func (a *BasicTransferAdapter) Download(ctx context.Context, r *ObjectResponse) (io.ReadCloser, error) {
+	download, ok := r.Actions["download"]
+	if !ok {
+		return nil, errors.New("lfs.BasicTransferAdapter.Download: Action 'download' not found")
+	}
+
+	req, err := http.NewRequestWithContext(ctx, "GET", download.Href, nil)
+	if err != nil {
+		return nil, fmt.Errorf("lfs.BasicTransferAdapter.Download http.NewRequestWithContext: %w", err)
+	}
+	for key, value := range download.Header {
+		req.Header.Set(key, value)
+	}
+
+	res, err := a.client.Do(req)
+	if err != nil {
+		select {
+		case <-ctx.Done():
+			return nil, ctx.Err()
+		default:
+		}
+		return nil, fmt.Errorf("lfs.BasicTransferAdapter.Download http.Do: %w", err)
+	}
+
+	return res.Body, nil
+}