forked from gitea/gitea
73 lines
1.8 KiB
Go
73 lines
1.8 KiB
Go
// Copyright 2015 The Gogs Authors. All rights reserved.
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// Copyright 2019 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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"encoding/hex"
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"fmt"
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"regexp"
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"strings"
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)
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// EmptySHA defines empty git SHA (undefined, non-existent)
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const EmptySHA = "0000000000000000000000000000000000000000"
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// EmptyTreeSHA is the SHA of an empty tree, the root of all git repositories
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const EmptyTreeSHA = "4b825dc642cb6eb9a060e54bf8d69288fbee4904"
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// SHAFullLength is the full length of a git SHA
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const SHAFullLength = 40
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// SHAPattern can be used to determine if a string is an valid sha
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var shaPattern = regexp.MustCompile(`^[0-9a-f]{4,40}$`)
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// IsValidSHAPattern will check if the provided string matches the SHA Pattern
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func IsValidSHAPattern(sha string) bool {
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return shaPattern.MatchString(sha)
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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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// MustID always creates a new SHA1 from a [20]byte array with no validation of input.
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func MustID(b []byte) SHA1 {
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var id SHA1
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copy(id[:], b)
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return id
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}
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// NewID creates a new SHA1 from a [20]byte array.
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func NewID(b []byte) (SHA1, error) {
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if len(b) != 20 {
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return SHA1{}, fmt.Errorf("Length must be 20: %v", b)
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}
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return MustID(b), nil
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}
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// MustIDFromString always creates a new sha from a ID with no validation of input.
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func MustIDFromString(s string) SHA1 {
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b, _ := hex.DecodeString(s)
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return MustID(b)
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}
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// NewIDFromString creates a new SHA1 from a ID string of length 40.
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func NewIDFromString(s string) (SHA1, error) {
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var id SHA1
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s = strings.TrimSpace(s)
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if len(s) != SHAFullLength {
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return id, fmt.Errorf("Length must be 40: %s", s)
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}
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b, err := hex.DecodeString(s)
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if err != nil {
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return id, err
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}
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return NewID(b)
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}
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