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intoto.go
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/
intoto.go
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//
// Copyright 2021 The Sigstore Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package intoto
import (
"context"
"errors"
"fmt"
"github.com/sigstore/rekor/pkg/generated/models"
"github.com/sigstore/rekor/pkg/log"
"github.com/sigstore/rekor/pkg/types"
"golang.org/x/exp/slices"
)
const (
KIND = "intoto"
)
type BaseIntotoType struct {
types.RekorType
}
func init() {
types.TypeMap.Store(KIND, New)
}
func New() types.TypeImpl {
bit := BaseIntotoType{}
bit.Kind = KIND
bit.VersionMap = VersionMap
return &bit
}
var VersionMap = types.NewSemVerEntryFactoryMap()
func (it BaseIntotoType) UnmarshalEntry(pe models.ProposedEntry) (types.EntryImpl, error) {
if pe == nil {
return nil, errors.New("proposed entry cannot be nil")
}
in, ok := pe.(*models.Intoto)
if !ok {
return nil, errors.New("cannot unmarshal non-Rekord types")
}
return it.VersionedUnmarshal(in, *in.APIVersion)
}
func (it *BaseIntotoType) CreateProposedEntry(ctx context.Context, version string, props types.ArtifactProperties) (models.ProposedEntry, error) {
var head ProposedIntotoEntryIterator
var next *ProposedIntotoEntryIterator
if version == "" {
// get default version as head of list
version = it.DefaultVersion()
ei, err := it.VersionedUnmarshal(nil, version)
if err != nil {
return nil, fmt.Errorf("fetching default Intoto version implementation: %w", err)
}
pe, err := ei.CreateFromArtifactProperties(ctx, props)
if err != nil {
return nil, fmt.Errorf("creating default Intoto entry: %w", err)
}
head.ProposedEntry = pe
next = &head
for _, v := range it.SupportedVersions() {
if v == it.DefaultVersion() {
continue
}
ei, err := it.VersionedUnmarshal(nil, v)
if err != nil {
log.Logger.Errorf("fetching Intoto version (%v) implementation: %w", v, err)
continue
}
versionedPE, err := ei.CreateFromArtifactProperties(ctx, props)
if err != nil {
log.Logger.Errorf("error creating Intoto entry of version (%v): %w", v, err)
continue
}
next.next = &ProposedIntotoEntryIterator{versionedPE, nil}
next = next.next.(*ProposedIntotoEntryIterator)
}
return head, nil
}
ei, err := it.VersionedUnmarshal(nil, version)
if err != nil {
return nil, fmt.Errorf("fetching Intoto version implementation: %w", err)
}
return ei.CreateFromArtifactProperties(ctx, props)
}
func (it BaseIntotoType) DefaultVersion() string {
return "0.0.2"
}
// SupportedVersions returns the supported versions for this type in the order of preference
func (it BaseIntotoType) SupportedVersions() []string {
return []string{"0.0.2", "0.0.1"}
}
// IsSupportedVersion returns true if the version can be inserted into the log, and false if not
func (it *BaseIntotoType) IsSupportedVersion(proposedVersion string) bool {
return slices.Contains(it.SupportedVersions(), proposedVersion)
}
type ProposedIntotoEntryIterator struct {
models.ProposedEntry
next models.ProposedEntry
}
func (p ProposedIntotoEntryIterator) HasNext() bool {
return p.next != nil
}
func (p ProposedIntotoEntryIterator) GetNext() models.ProposedEntry {
return p.next
}
func (p ProposedIntotoEntryIterator) Get() models.ProposedEntry {
return p.ProposedEntry
}