forked from mirror/gitea
d68a613ba8
Currently only SHA1 repositories are supported by Gitea. This adds support for alternate SHA256 with the additional aim of easier support for additional hash types in the future. Fixes: #13794 Limited by: https://github.com/go-git/go-git/issues/899 Depend on: #28138 <img width="776" alt="图片" src="https://github.com/go-gitea/gitea/assets/81045/5448c9a7-608e-4341-a149-5dd0069c9447"> --------- Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com> Co-authored-by: 6543 <6543@obermui.de>
107 lines
2.2 KiB
Go
107 lines
2.2 KiB
Go
// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package git
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import (
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"bytes"
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"encoding/hex"
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"fmt"
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)
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type ObjectID interface {
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String() string
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IsZero() bool
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RawValue() []byte
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Type() ObjectFormat
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}
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/* SHA1 */
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type Sha1Hash [20]byte
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func (h *Sha1Hash) String() string {
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return hex.EncodeToString(h[:])
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}
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func (h *Sha1Hash) IsZero() bool {
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empty := Sha1Hash{}
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return bytes.Equal(empty[:], h[:])
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}
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func (h *Sha1Hash) RawValue() []byte { return h[:] }
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func (*Sha1Hash) Type() ObjectFormat { return Sha1ObjectFormat }
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var _ ObjectID = &Sha1Hash{}
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func MustIDFromString(hexHash string) ObjectID {
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id, err := NewIDFromString(hexHash)
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if err != nil {
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panic(err)
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}
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return id
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}
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/* SHA256 */
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type Sha256Hash [32]byte
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func (h *Sha256Hash) String() string {
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return hex.EncodeToString(h[:])
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}
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func (h *Sha256Hash) IsZero() bool {
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empty := Sha256Hash{}
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return bytes.Equal(empty[:], h[:])
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}
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func (h *Sha256Hash) RawValue() []byte { return h[:] }
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func (*Sha256Hash) Type() ObjectFormat { return Sha256ObjectFormat }
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/* utility */
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func NewIDFromString(hexHash string) (ObjectID, error) {
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var theObjectFormat ObjectFormat
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for _, objectFormat := range SupportedObjectFormats {
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if len(hexHash) == objectFormat.FullLength() {
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theObjectFormat = objectFormat
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break
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}
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}
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if theObjectFormat == nil {
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return nil, fmt.Errorf("length %d has no matched object format: %s", len(hexHash), hexHash)
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}
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b, err := hex.DecodeString(hexHash)
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if err != nil {
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return nil, err
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}
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if len(b) != theObjectFormat.FullLength()/2 {
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return theObjectFormat.EmptyObjectID(), fmt.Errorf("length must be %d: %v", theObjectFormat.FullLength(), b)
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}
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return theObjectFormat.MustID(b), nil
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}
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func IsEmptyCommitID(commitID string) bool {
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if commitID == "" {
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return true
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}
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id, err := NewIDFromString(commitID)
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if err != nil {
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return false
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}
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return id.IsZero()
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}
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// ComputeBlobHash compute the hash for a given blob content
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func ComputeBlobHash(hashType ObjectFormat, content []byte) ObjectID {
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return hashType.ComputeHash(ObjectBlob, content)
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}
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type ErrInvalidSHA struct {
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SHA string
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}
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func (err ErrInvalidSHA) Error() string {
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return fmt.Sprintf("invalid sha: %s", err.SHA)
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}
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