mirror of
https://github.com/go-gitea/gitea.git
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breken
118 lines
4.0 KiB
Go
118 lines
4.0 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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"crypto/sha256"
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"strconv"
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)
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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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// 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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emptySha1ObjectID = &Sha1Hash{}
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// emptySha1Tree: 4b825dc642cb6eb9a060e54bf8d69288fbee4904
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emptySha1Tree = &Sha1Hash{0x4b, 0x82, 0x5d, 0xc6, 0x42, 0xcb, 0x6e, 0xb9, 0xa0, 0x60, 0xe5, 0x4b, 0xf8, 0xd6, 0x92, 0x88, 0xfb, 0xee, 0x49, 0x04}
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)
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func (Sha1ObjectFormatImpl) Name() string { return "sha1" }
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func (Sha1ObjectFormatImpl) EmptyObjectID() ObjectID { return emptySha1ObjectID }
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func (Sha1ObjectFormatImpl) EmptyTree() ObjectID { return emptySha1Tree }
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func (Sha1ObjectFormatImpl) FullLength() int { return 40 }
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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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_, _ = hasher.Write(content)
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return h.MustID(hasher.Sum(nil))
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}
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type Sha256ObjectFormatImpl struct{}
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var (
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emptySha256ObjectID = &Sha256Hash{}
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emptySha256Tree = &Sha256Hash{
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0x6e, 0xf1, 0x9b, 0x41, 0x22, 0x5c, 0x53, 0x69, 0xf1, 0xc1,
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0x04, 0xd4, 0x5d, 0x8d, 0x85, 0xef, 0xa9, 0xb0, 0x57, 0xb5,
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0x3b, 0x14, 0xb4, 0xb9, 0xb9, 0x39, 0xdd, 0x74, 0xde, 0xcc,
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0x53, 0x21,
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}
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)
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func (Sha256ObjectFormatImpl) Name() string { return "sha256" }
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func (Sha256ObjectFormatImpl) EmptyObjectID() ObjectID { return emptySha256ObjectID }
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func (Sha256ObjectFormatImpl) EmptyTree() ObjectID { return emptySha256Tree }
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func (Sha256ObjectFormatImpl) FullLength() int { return 64 }
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func (Sha256ObjectFormatImpl) MustID(b []byte) ObjectID {
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var id Sha256Hash
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copy(id[0:32], 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 Sha256ObjectFormatImpl) ComputeHash(t ObjectType, content []byte) ObjectID {
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hasher := sha256.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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_, _ = hasher.Write(content)
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return h.MustID(hasher.Sum(nil))
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}
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type invalidObjectFormatImpl struct{}
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func (h invalidObjectFormatImpl) Name() string { return "invalid-object-format" }
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func (h invalidObjectFormatImpl) EmptyObjectID() ObjectID { return &Sha1Hash{} }
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func (h invalidObjectFormatImpl) EmptyTree() ObjectID { return h.EmptyObjectID() }
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func (h invalidObjectFormatImpl) FullLength() int { return len(h.EmptyObjectID().RawValue()) * 2 }
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func (h invalidObjectFormatImpl) MustID(b []byte) ObjectID { return h.EmptyObjectID() }
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func (h invalidObjectFormatImpl) ComputeHash(t ObjectType, content []byte) ObjectID {
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return h.EmptyObjectID()
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}
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var (
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Sha1ObjectFormat ObjectFormat = Sha1ObjectFormatImpl{}
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Sha256ObjectFormat ObjectFormat = Sha256ObjectFormatImpl{}
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invalidObjectFormat ObjectFormat = invalidObjectFormatImpl{}
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)
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func ObjectFormatFromName(name string) ObjectFormat {
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for _, objectFormat := range DefaultFeatures().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 invalidObjectFormat
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}
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func IsValidObjectFormat(name string) bool {
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return ObjectFormatFromName(name) != invalidObjectFormat
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}
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