4eb2a29910
The 4 functions are duplicated, especially as interface methods. I think we just need to keep `MustID` the only one and remove other 3. ``` MustID(b []byte) ObjectID MustIDFromString(s string) ObjectID NewID(b []byte) (ObjectID, error) NewIDFromString(s string) (ObjectID, error) ``` Introduced the new interfrace method `ComputeHash` which will replace the interface `HasherInterface`. Now we don't need to keep two interfaces. Reintroduced `git.NewIDFromString` and `git.MustIDFromString`. The new function will detect the hash length to decide which objectformat of it. If it's 40, then it's SHA1. If it's 64, then it's SHA256. This will be right if the commitID is a full one. So the parameter should be always a full commit id. @AdamMajer Please review.
93 lines
2.4 KiB
Go
93 lines
2.4 KiB
Go
// 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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