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- // Copyright 2015 The Gogs Authors. All rights reserved.
- // Copyright 2019 The Gitea Authors. All rights reserved.
- // Use of this source code is governed by a MIT-style
- // license that can be found in the LICENSE file.
-
- package git
-
- import (
- "encoding/hex"
- "fmt"
- "regexp"
- "strings"
- )
-
- // EmptySHA defines empty git SHA
- const EmptySHA = "0000000000000000000000000000000000000000"
-
- // EmptyTreeSHA is the SHA of an empty tree
- const EmptyTreeSHA = "4b825dc642cb6eb9a060e54bf8d69288fbee4904"
-
- // SHAPattern can be used to determine if a string is an valid sha
- var SHAPattern = regexp.MustCompile(`^[0-9a-f]{4,40}$`)
-
- // MustID always creates a new SHA1 from a [20]byte array with no validation of input.
- func MustID(b []byte) SHA1 {
- var id SHA1
- copy(id[:], b)
- return id
- }
-
- // NewID creates a new SHA1 from a [20]byte array.
- func NewID(b []byte) (SHA1, error) {
- if len(b) != 20 {
- return SHA1{}, fmt.Errorf("Length must be 20: %v", b)
- }
- return MustID(b), nil
- }
-
- // MustIDFromString always creates a new sha from a ID with no validation of input.
- func MustIDFromString(s string) SHA1 {
- b, _ := hex.DecodeString(s)
- return MustID(b)
- }
-
- // NewIDFromString creates a new SHA1 from a ID string of length 40.
- func NewIDFromString(s string) (SHA1, error) {
- var id SHA1
- s = strings.TrimSpace(s)
- if len(s) != 40 {
- return id, fmt.Errorf("Length must be 40: %s", s)
- }
- b, err := hex.DecodeString(s)
- if err != nil {
- return id, err
- }
- return NewID(b)
- }
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