LFS support to be stored on minio (#12518)

* LFS support to be stored on minio

* Fix test

* Fix lint

* Fix lint

* Fix check

* Fix test

* Update documents and add migration for LFS

* Fix some bugs

3 files changed, 98 insertions, 3 deletions

diff --git a/modules/storage/local.go b/modules/storage/local.go
index 4c830211d9..a937a831f1 100644
--- a/modules/storage/local.go
+++ b/modules/storage/local.go
@@ -34,7 +34,7 @@ func NewLocalStorage(bucket string) (*LocalStorage, error) {
 }
 
 // Open a file
-func (l *LocalStorage) Open(path string) (io.ReadCloser, error) {
+func (l *LocalStorage) Open(path string) (Object, error) {
 	return os.Open(filepath.Join(l.dir, path))
 }
 
@@ -58,6 +58,11 @@ func (l *LocalStorage) Save(path string, r io.Reader) (int64, error) {
 	return io.Copy(f, r)
 }
 
+// Stat returns the info of the file
+func (l *LocalStorage) Stat(path string) (ObjectInfo, error) {
+	return os.Stat(filepath.Join(l.dir, path))
+}
+
 // Delete delete a file
 func (l *LocalStorage) Delete(path string) error {
 	p := filepath.Join(l.dir, path)
diff --git a/modules/storage/minio.go b/modules/storage/minio.go
index 77d24e6b73..30751755f3 100644
--- a/modules/storage/minio.go
+++ b/modules/storage/minio.go
@@ -8,6 +8,7 @@ import (
 	"context"
 	"io"
 	"net/url"
+	"os"
 	"path"
 	"strings"
 	"time"
@@ -62,7 +63,7 @@ func (m *MinioStorage) buildMinioPath(p string) string {
 }
 
 // Open open a file
-func (m *MinioStorage) Open(path string) (io.ReadCloser, error) {
+func (m *MinioStorage) Open(path string) (Object, error) {
 	var opts = minio.GetObjectOptions{}
 	object, err := m.client.GetObject(m.ctx, m.bucket, m.buildMinioPath(path), opts)
 	if err != nil {
@@ -87,6 +88,41 @@ func (m *MinioStorage) Save(path string, r io.Reader) (int64, error) {
 	return uploadInfo.Size, nil
 }
 
+type minioFileInfo struct {
+	minio.ObjectInfo
+}
+
+func (m minioFileInfo) Name() string {
+	return m.ObjectInfo.Key
+}
+
+func (m minioFileInfo) Size() int64 {
+	return m.ObjectInfo.Size
+}
+
+func (m minioFileInfo) ModTime() time.Time {
+	return m.LastModified
+}
+
+// Stat returns the stat information of the object
+func (m *MinioStorage) Stat(path string) (ObjectInfo, error) {
+	info, err := m.client.StatObject(
+		m.ctx,
+		m.bucket,
+		m.buildMinioPath(path),
+		minio.StatObjectOptions{},
+	)
+	if err != nil {
+		if errResp, ok := err.(minio.ErrorResponse); ok {
+			if errResp.Code == "NoSuchKey" {
+				return nil, os.ErrNotExist
+			}
+		}
+		return nil, err
+	}
+	return &minioFileInfo{info}, nil
+}
+
 // Delete delete a file
 func (m *MinioStorage) Delete(path string) error {
 	return m.client.RemoveObject(m.ctx, m.bucket, m.buildMinioPath(path), minio.RemoveObjectOptions{})
diff --git a/modules/storage/storage.go b/modules/storage/storage.go
index 8528ebc5cb..e355d2459f 100644
--- a/modules/storage/storage.go
+++ b/modules/storage/storage.go
@@ -10,6 +10,7 @@ import (
 	"fmt"
 	"io"
 	"net/url"
+	"time"
 
 	"code.gitea.io/gitea/modules/setting"
 )
@@ -19,10 +20,24 @@ var (
 	ErrURLNotSupported = errors.New("url method not supported")
 )
 
+// Object represents the object on the storage
+type Object interface {
+	io.ReadCloser
+	io.Seeker
+}
+
+// ObjectInfo represents the object info on the storage
+type ObjectInfo interface {
+	Name() string
+	Size() int64
+	ModTime() time.Time
+}
+
 // ObjectStorage represents an object storage to handle a bucket and files
 type ObjectStorage interface {
+	Open(path string) (Object, error)
 	Save(path string, r io.Reader) (int64, error)
-	Open(path string) (io.ReadCloser, error)
+	Stat(path string) (ObjectInfo, error)
 	Delete(path string) error
 	URL(path, name string) (*url.URL, error)
 }
@@ -41,10 +56,21 @@ func Copy(dstStorage ObjectStorage, dstPath string, srcStorage ObjectStorage, sr
 var (
 	// Attachments represents attachments storage
 	Attachments ObjectStorage
+
+	// LFS represents lfs storage
+	LFS ObjectStorage
 )
 
 // Init init the stoarge
 func Init() error {
+	if err := initAttachments(); err != nil {
+		return err
+	}
+
+	return initLFS()
+}
+
+func initAttachments() error {
 	var err error
 	switch setting.Attachment.StoreType {
 	case "local":
@@ -71,3 +97,31 @@ func Init() error {
 
 	return nil
 }
+
+func initLFS() error {
+	var err error
+	switch setting.LFS.StoreType {
+	case "local":
+		LFS, err = NewLocalStorage(setting.LFS.ContentPath)
+	case "minio":
+		minio := setting.LFS.Minio
+		LFS, err = NewMinioStorage(
+			context.Background(),
+			minio.Endpoint,
+			minio.AccessKeyID,
+			minio.SecretAccessKey,
+			minio.Bucket,
+			minio.Location,
+			minio.BasePath,
+			minio.UseSSL,
+		)
+	default:
+		return fmt.Errorf("Unsupported LFS store type: %s", setting.LFS.StoreType)
+	}
+
+	if err != nil {
+		return err
+	}
+
+	return nil
+}