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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 types
import (
"fmt"
"sync"
"github.com/blang/semver"
"github.com/sigstore/rekor/pkg/internal/log"
)
// VersionEntryFactoryMap defines a map-like interface to find the correct implementation for a version string
// This could be a simple map[string][EntryFactory], or something more elegant (e.g. semver)
type VersionEntryFactoryMap interface {
GetEntryFactory(string) (EntryFactory, error) // return the entry factory for the specified version
SetEntryFactory(string, EntryFactory) error // set the entry factory for the specified version
Count() int // return the count of entry factories currently in the map
SupportedVersions() []string // return a list of versions currently stored in the map
}
// SemVerEntryFactoryMap implements a map that allows implementations to specify their supported versions using
// semver-compliant strings
type SemVerEntryFactoryMap struct {
factoryMap map[string]EntryFactory
sync.RWMutex
}
func NewSemVerEntryFactoryMap() VersionEntryFactoryMap {
s := SemVerEntryFactoryMap{}
s.factoryMap = make(map[string]EntryFactory)
return &s
}
func (s *SemVerEntryFactoryMap) Count() int {
return len(s.factoryMap)
}
func (s *SemVerEntryFactoryMap) GetEntryFactory(version string) (EntryFactory, error) {
s.RLock()
defer s.RUnlock()
semverToMatch, err := semver.Parse(version)
if err != nil {
log.Logger.Error(err)
return nil, err
}
// will return first function that matches
for k, v := range s.factoryMap {
semverRange, err := semver.ParseRange(k)
if err != nil {
log.Logger.Error(err)
return nil, err
}
if semverRange(semverToMatch) {
return v, nil
}
}
return nil, fmt.Errorf("unable to locate entry for version %s", version)
}
func (s *SemVerEntryFactoryMap) SetEntryFactory(constraint string, ef EntryFactory) error {
s.Lock()
defer s.Unlock()
if _, err := semver.ParseRange(constraint); err != nil {
log.Logger.Error(err)
return err
}
s.factoryMap[constraint] = ef
return nil
}
func (s *SemVerEntryFactoryMap) SupportedVersions() []string {
var versions []string
for k := range s.factoryMap {
versions = append(versions, k)
}
return versions
}
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