66 lines
1.7 KiB
Go
66 lines
1.7 KiB
Go
// 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"
|
|
|
|
// SHAFullLength is the full length of a git SHA
|
|
const SHAFullLength = 40
|
|
|
|
// SHAPattern can be used to determine if a string is an valid sha
|
|
var shaPattern = regexp.MustCompile(`^[0-9a-f]{4,40}$`)
|
|
|
|
// IsValidSHAPattern will check if the provided string matches the SHA Pattern
|
|
func IsValidSHAPattern(sha string) bool {
|
|
return shaPattern.MatchString(sha)
|
|
}
|
|
|
|
// 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) != SHAFullLength {
|
|
return id, fmt.Errorf("Length must be 40: %s", s)
|
|
}
|
|
b, err := hex.DecodeString(s)
|
|
if err != nil {
|
|
return id, err
|
|
}
|
|
return NewID(b)
|
|
}
|