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93 lines
2.4 KiB
93 lines
2.4 KiB
// 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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"regexp"
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"strconv"
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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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// Name returns the name of the object format
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Name() string
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// EmptyObjectID creates a new empty ObjectID from an object format hash name
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EmptyObjectID() 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 returns true if the input is a valid hash
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IsValid(input string) bool
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// MustID creates a new ObjectID from a byte slice
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MustID(b []byte) ObjectID
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// ComputeHash compute the hash for a given ObjectType and content
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ComputeHash(t ObjectType, content []byte) ObjectID
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}
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type Sha1ObjectFormatImpl struct{}
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var (
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emptyObjectID = &Sha1Hash{}
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emptyTree = &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 (Sha1ObjectFormatImpl) Name() string { return "sha1" }
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func (Sha1ObjectFormatImpl) EmptyObjectID() ObjectID {
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return emptyObjectID
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}
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func (Sha1ObjectFormatImpl) EmptyTree() ObjectID {
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return emptyTree
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}
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func (Sha1ObjectFormatImpl) FullLength() int { return 40 }
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func (Sha1ObjectFormatImpl) IsValid(input string) bool {
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return sha1Pattern.MatchString(input)
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}
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func (Sha1ObjectFormatImpl) 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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// ComputeHash compute the hash for a given ObjectType and content
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func (h Sha1ObjectFormatImpl) ComputeHash(t ObjectType, content []byte) ObjectID {
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hasher := sha1.New()
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_, _ = hasher.Write(t.Bytes())
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_, _ = hasher.Write([]byte(" "))
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_, _ = hasher.Write([]byte(strconv.FormatInt(int64(len(content)), 10)))
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_, _ = hasher.Write([]byte{0})
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// HashSum generates a SHA1 for the provided hash
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var sha1 Sha1Hash
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copy(sha1[:], hasher.Sum(nil))
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return &sha1
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}
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var Sha1ObjectFormat ObjectFormat = Sha1ObjectFormatImpl{}
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var SupportedObjectFormats = []ObjectFormat{
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Sha1ObjectFormat,
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// TODO: add sha256
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}
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func ObjectFormatFromName(name string) ObjectFormat {
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for _, objectFormat := range SupportedObjectFormats {
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if name == objectFormat.Name() {
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return objectFormat
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}
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}
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return nil
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}
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func IsValidObjectFormat(name string) bool {
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return ObjectFormatFromName(name) != nil
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}
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