Working on SFTP

1 files changed, 152 insertions, 0 deletions

diff --git a/s3/fs.go b/s3/fs.go
new file mode 100644
index 0000000..c5ae6a0
--- /dev/null
+++ b/s3/fs.go
@@ -0,0 +1,152 @@
+package s3
+
+import (
+	"context"
+	"errors"
+	"io"
+	"log"
+	"os"
+	"path"
+	"strings"
+	"time"
+
+	"github.com/minio/minio-go/v7"
+	"golang.org/x/net/webdav"
+)
+
+/*
+ * S3FS lifetime is limited to a single request
+ * Conversely, Golang's abstraction has been thought to be shared between users
+ * Sharing an instance between users would be very dangerous (as we would need many checks between shared values)
+ */
+type S3FS struct {
+	cache map[string]*S3Stat
+	mc    *minio.Client
+	ctx   context.Context
+}
+
+func NewS3FS(mc *minio.Client) S3FS {
+	return S3FS{
+		cache: make(map[string]*S3Stat),
+		mc:    mc,
+	}
+}
+
+func (s S3FS) Mkdir(ctx context.Context, name string, perm os.FileMode) error {
+	s.ctx = ctx
+
+	p := NewS3Path(name)
+
+	if p.Class == ROOT {
+		return errors.New("Unable to create another root folder")
+	} else if p.Class == BUCKET {
+		log.Println("Creating bucket is not implemented yet")
+		return nil
+	}
+
+	f, err := NewS3File(&s, path.Join(name, ".bagage"))
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	_, err = io.Copy(f, strings.NewReader("This is a placeholder"))
+	return nil
+}
+
+func (s S3FS) OpenFile2(ctx context.Context, name string, flag int, perm os.FileMode) (*S3File, error) {
+	s.ctx = ctx
+
+	// If the file does not exist when opening it, we create a stub
+	if _, ok := s.cache[name]; !ok {
+		st := new(S3Stat)
+		st.fs = &s
+		st.path = NewS3Path(name)
+		st.path.Class = OBJECT
+		st.obj.Key = st.path.Key
+		st.obj.LastModified = time.Now()
+		s.cache[name] = st
+	}
+
+	return NewS3File(&s, name)
+}
+
+func (s S3FS) OpenFile(ctx context.Context, name string, flag int, perm os.FileMode) (webdav.File, error) {
+	return s.OpenFile2(ctx, name, flag, perm)
+}
+
+func (s S3FS) RemoveAll(ctx context.Context, name string) error {
+	//@FIXME nautilus deletes files one by one, at the end, it does not find its folder as it is "already deleted"
+	s.ctx = ctx
+
+	p := NewS3Path(name)
+	if p.Class == ROOT {
+		return errors.New("Unable to create another root folder")
+	} else if p.Class == BUCKET {
+		log.Println("Deleting bucket is not implemented yet")
+		return nil
+	}
+
+	objCh := s.mc.ListObjects(s.ctx, p.Bucket, minio.ListObjectsOptions{Prefix: p.Key, Recursive: true})
+	rmCh := s.mc.RemoveObjects(s.ctx, p.Bucket, objCh, minio.RemoveObjectsOptions{})
+
+	for rErr := range rmCh {
+		return rErr.Err
+	}
+
+	return nil
+}
+
+func (s S3FS) Rename(ctx context.Context, oldName, newName string) error {
+	s.ctx = ctx
+
+	po := NewS3Path(oldName)
+	pn := NewS3Path(newName)
+	if po.Class == ROOT || pn.Class == ROOT {
+		return errors.New("Unable to rename root folder")
+	} else if po.Class == BUCKET || pn.Class == BUCKET {
+		log.Println("Moving a bucket is not implemented yet")
+		return nil
+	}
+
+	//Check that newName is not inside oldName
+	if len(newName) > len(oldName) && newName[:len(oldName)] == oldName {
+		return errors.New("Cannot move an entity inside itself (eg. moving /data in /data/test is impossible)")
+	}
+
+	//Gather all keys, copy the object, delete the original
+	objCh := s.mc.ListObjects(s.ctx, po.Bucket, minio.ListObjectsOptions{Prefix: po.Key, Recursive: true})
+	for obj := range objCh {
+		src := minio.CopySrcOptions{
+			Bucket: po.Bucket,
+			Object: obj.Key,
+		}
+
+		dst := minio.CopyDestOptions{
+			Bucket: pn.Bucket,
+			Object: path.Join(pn.Key, obj.Key[len(po.Key):]),
+		}
+
+		_, err := s.mc.CopyObject(s.ctx, dst, src)
+		if err != nil {
+			return err
+		}
+
+		err = s.mc.RemoveObject(s.ctx, po.Bucket, obj.Key, minio.RemoveObjectOptions{})
+		var e minio.ErrorResponse
+		log.Println(errors.As(err, &e))
+		log.Println(e)
+		if errors.As(err, &e) && e.StatusCode == 200 {
+			/* @FIXME workaround for garage's bug #98 */
+		} else if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (s S3FS) Stat(ctx context.Context, name string) (os.FileInfo, error) {
+	s.ctx = ctx
+	return NewS3Stat(&s, name)
+}