forked from gitea/gitea
102 lines
2.3 KiB
Go
102 lines
2.3 KiB
Go
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// 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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"crypto/sha1"
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"fmt"
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"regexp"
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"strings"
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)
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type ObjectFormatID int
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const (
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Sha1 ObjectFormatID = iota
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)
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// sha1Pattern can be used to determine if a string is an valid sha
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var sha1Pattern = regexp.MustCompile(`^[0-9a-f]{4,40}$`)
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type ObjectFormat interface {
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ID() ObjectFormatID
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String() string
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// Empty is the hash of empty git
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Empty() ObjectID
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// EmptyTree is the hash of an empty tree
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EmptyTree() ObjectID
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// FullLength is the length of the hash's hex string
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FullLength() int
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IsValid(input string) bool
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MustID(b []byte) ObjectID
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MustIDFromString(s string) ObjectID
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NewID(b []byte) (ObjectID, error)
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NewIDFromString(s string) (ObjectID, error)
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NewEmptyID() ObjectID
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NewHasher() HasherInterface
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}
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type Sha1ObjectFormat struct{}
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func (*Sha1ObjectFormat) ID() ObjectFormatID { return Sha1 }
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func (*Sha1ObjectFormat) String() string { return "sha1" }
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func (*Sha1ObjectFormat) Empty() ObjectID { return &Sha1Hash{} }
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func (*Sha1ObjectFormat) EmptyTree() ObjectID {
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return &Sha1Hash{
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0x4b, 0x82, 0x5d, 0xc6, 0x42, 0xcb, 0x6e, 0xb9, 0xa0, 0x60,
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0xe5, 0x4b, 0xf8, 0xd6, 0x92, 0x88, 0xfb, 0xee, 0x49, 0x04,
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}
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}
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func (*Sha1ObjectFormat) FullLength() int { return 40 }
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func (*Sha1ObjectFormat) IsValid(input string) bool {
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return sha1Pattern.MatchString(input)
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}
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func (*Sha1ObjectFormat) MustID(b []byte) ObjectID {
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var id Sha1Hash
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copy(id[0:20], b)
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return &id
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}
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func (h *Sha1ObjectFormat) MustIDFromString(s string) ObjectID {
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return MustIDFromString(h, s)
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}
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func (h *Sha1ObjectFormat) NewID(b []byte) (ObjectID, error) {
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return IDFromRaw(h, b)
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}
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func (h *Sha1ObjectFormat) NewIDFromString(s string) (ObjectID, error) {
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return genericIDFromString(h, s)
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}
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func (*Sha1ObjectFormat) NewEmptyID() ObjectID {
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return NewSha1()
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}
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func (h *Sha1ObjectFormat) NewHasher() HasherInterface {
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return &Sha1Hasher{sha1.New()}
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}
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func ObjectFormatFromID(id ObjectFormatID) ObjectFormat {
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switch id {
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case Sha1:
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return &Sha1ObjectFormat{}
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}
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return nil
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}
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func ObjectFormatFromString(hash string) (ObjectFormat, error) {
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switch strings.ToLower(hash) {
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case "sha1":
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return &Sha1ObjectFormat{}, nil
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}
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return nil, fmt.Errorf("unknown hash type: %s", hash)
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}
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