1 files changed, 101 insertions, 0 deletions
diff --git a/modules/git/repo_object.go b/modules/git/repo_object.go
new file mode 100644
index 00000000..3d48b91c
--- /dev/null
+++ b/modules/git/repo_object.go
@@ -0,0 +1,101 @@
+// Copyright 2014 The Gogs Authors. All rights reserved.
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package git
+
+import (
+	"bytes"
+	"io"
+	"strings"
+)
+
+// ObjectType git object type
+type ObjectType string
+
+const (
+	// ObjectCommit commit object type
+	ObjectCommit ObjectType = "commit"
+	// ObjectTree tree object type
+	ObjectTree ObjectType = "tree"
+	// ObjectBlob blob object type
+	ObjectBlob ObjectType = "blob"
+	// ObjectTag tag object type
+	ObjectTag ObjectType = "tag"
+	// ObjectBranch branch object type
+	ObjectBranch ObjectType = "branch"
+)
+
+// Bytes returns the byte array for the Object Type
+func (o ObjectType) Bytes() []byte {
+	return []byte(o)
+}
+
+type EmptyReader struct{}
+
+func (EmptyReader) Read(p []byte) (int, error) {
+	return 0, io.EOF
+}
+
+func (repo *Repository) GetObjectFormat() (ObjectFormat, error) {
+	if repo != nil && repo.objectFormat != nil {
+		return repo.objectFormat, nil
+	}
+
+	str, err := repo.hashObject(EmptyReader{}, false)
+	if err != nil {
+		return nil, err
+	}
+	hash, err := NewIDFromString(str)
+	if err != nil {
+		return nil, err
+	}
+
+	repo.objectFormat = hash.Type()
+
+	return repo.objectFormat, nil
+}
+
+// HashObject takes a reader and returns hash for that reader
+func (repo *Repository) HashObject(reader io.Reader) (ObjectID, error) {
+	idStr, err := repo.hashObject(reader, true)
+	if err != nil {
+		return nil, err
+	}
+	return NewIDFromString(idStr)
+}
+
+func (repo *Repository) hashObject(reader io.Reader, save bool) (string, error) {
+	var cmd *Command
+	if save {
+		cmd = NewCommand(repo.Ctx, "hash-object", "-w", "--stdin")
+	} else {
+		cmd = NewCommand(repo.Ctx, "hash-object", "--stdin")
+	}
+	stdout := new(bytes.Buffer)
+	stderr := new(bytes.Buffer)
+	err := cmd.Run(&RunOpts{
+		Dir:    repo.Path,
+		Stdin:  reader,
+		Stdout: stdout,
+		Stderr: stderr,
+	})
+	if err != nil {
+		return "", err
+	}
+	return strings.TrimSpace(stdout.String()), nil
+}
+
+// GetRefType gets the type of the ref based on the string
+func (repo *Repository) GetRefType(ref string) ObjectType {
+	if repo.IsTagExist(ref) {
+		return ObjectTag
+	} else if repo.IsBranchExist(ref) {
+		return ObjectBranch
+	} else if repo.IsCommitExist(ref) {
+		return ObjectCommit
+	} else if _, err := repo.GetBlob(ref); err == nil {
+		return ObjectBlob
+	}
+	return ObjectType("invalid")
+}