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forgejo/modules/git/object_format.go
oliverpool 3f9f6f1350 fix: hook post-receive for sha256 repos
(cherry picked from commit 5e73c67d67)
2024-05-15 21:08:15 +00:00

143 lines
3.8 KiB
Go

// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package git
import (
"crypto/sha1"
"crypto/sha256"
"hash"
"regexp"
"strconv"
)
// sha1Pattern can be used to determine if a string is an valid sha
var sha1Pattern = regexp.MustCompile(`^[0-9a-f]{4,40}$`)
// sha256Pattern can be used to determine if a string is an valid sha
var sha256Pattern = regexp.MustCompile(`^[0-9a-f]{4,64}$`)
type ObjectFormat interface {
// Name returns the name of the object format
Name() string
// EmptyObjectID creates a new empty ObjectID from an object format hash name
EmptyObjectID() ObjectID
// EmptyTree is the hash of an empty tree
EmptyTree() ObjectID
// FullLength is the length of the hash's hex string
FullLength() int
// IsValid returns true if the input is a valid hash
IsValid(input string) bool
// MustID creates a new ObjectID from a byte slice
MustID(b []byte) ObjectID
// ComputeHash compute the hash for a given ObjectType and content
ComputeHash(t ObjectType, content []byte) ObjectID
}
func computeHash(dst []byte, hasher hash.Hash, t ObjectType, content []byte) []byte {
_, _ = hasher.Write(t.Bytes())
_, _ = hasher.Write([]byte(" "))
_, _ = hasher.Write([]byte(strconv.Itoa(len(content))))
_, _ = hasher.Write([]byte{0})
_, _ = hasher.Write(content)
return hasher.Sum(dst)
}
/* SHA1 Type */
type Sha1ObjectFormatImpl struct{}
var (
emptySha1ObjectID = &Sha1Hash{}
emptySha1Tree = &Sha1Hash{
0x4b, 0x82, 0x5d, 0xc6, 0x42, 0xcb, 0x6e, 0xb9, 0xa0, 0x60,
0xe5, 0x4b, 0xf8, 0xd6, 0x92, 0x88, 0xfb, 0xee, 0x49, 0x04,
}
)
func (Sha1ObjectFormatImpl) Name() string { return "sha1" }
func (Sha1ObjectFormatImpl) EmptyObjectID() ObjectID {
return emptySha1ObjectID
}
func (Sha1ObjectFormatImpl) EmptyTree() ObjectID {
return emptySha1Tree
}
func (Sha1ObjectFormatImpl) FullLength() int { return 40 }
func (Sha1ObjectFormatImpl) IsValid(input string) bool {
return sha1Pattern.MatchString(input)
}
func (Sha1ObjectFormatImpl) MustID(b []byte) ObjectID {
var id Sha1Hash
copy(id[0:20], b)
return &id
}
// ComputeHash compute the hash for a given ObjectType and content
func (h Sha1ObjectFormatImpl) ComputeHash(t ObjectType, content []byte) ObjectID {
var obj Sha1Hash
computeHash(obj[:0], sha1.New(), t, content)
return &obj
}
/* SHA256 Type */
type Sha256ObjectFormatImpl struct{}
var (
emptySha256ObjectID = &Sha256Hash{}
emptySha256Tree = &Sha256Hash{
0x6e, 0xf1, 0x9b, 0x41, 0x22, 0x5c, 0x53, 0x69, 0xf1, 0xc1,
0x04, 0xd4, 0x5d, 0x8d, 0x85, 0xef, 0xa9, 0xb0, 0x57, 0xb5,
0x3b, 0x14, 0xb4, 0xb9, 0xb9, 0x39, 0xdd, 0x74, 0xde, 0xcc,
0x53, 0x21,
}
)
func (Sha256ObjectFormatImpl) Name() string { return "sha256" }
func (Sha256ObjectFormatImpl) EmptyObjectID() ObjectID {
return emptySha256ObjectID
}
func (Sha256ObjectFormatImpl) EmptyTree() ObjectID {
return emptySha256Tree
}
func (Sha256ObjectFormatImpl) FullLength() int { return 64 }
func (Sha256ObjectFormatImpl) IsValid(input string) bool {
return sha256Pattern.MatchString(input)
}
func (Sha256ObjectFormatImpl) MustID(b []byte) ObjectID {
var id Sha256Hash
copy(id[0:32], b)
return &id
}
// ComputeHash compute the hash for a given ObjectType and content
func (h Sha256ObjectFormatImpl) ComputeHash(t ObjectType, content []byte) ObjectID {
var obj Sha256Hash
computeHash(obj[:0], sha256.New(), t, content)
return &obj
}
var (
Sha1ObjectFormat ObjectFormat = Sha1ObjectFormatImpl{}
Sha256ObjectFormat ObjectFormat = Sha256ObjectFormatImpl{}
// any addition must be reflected in IsEmptyCommitID
)
var SupportedObjectFormats = []ObjectFormat{
Sha1ObjectFormat,
}
func ObjectFormatFromName(name string) ObjectFormat {
for _, objectFormat := range SupportedObjectFormats {
if name == objectFormat.Name() {
return objectFormat
}
}
return nil
}
func IsValidObjectFormat(name string) bool {
return ObjectFormatFromName(name) != nil
}