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purl.go
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purl.go
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package purl
import (
"fmt"
"github.com/google/osv-scanner/pkg/lockfile"
"github.com/package-url/packageurl-go"
)
// Wraps a PURL parsed response for extensibility. This is internal and will
// be exposed through APIs only
type purlResponseWrapper struct {
pd lockfile.PackageDetails
instance packageurl.PackageURL
}
func (p *purlResponseWrapper) GetPackageDetails() lockfile.PackageDetails {
return p.pd
}
// ParsePackageUrl parses a PURL string and returns a lockfile.PackageDetails
// While this may seem like a parser concern, we are keeping it separate to avoid
// cyclical dependency problems since we are dividing the parser package into sub-packages
func ParsePackageUrl(purl string) (*purlResponseWrapper, error) {
instance, err := packageurl.FromString(purl)
if err != nil {
return nil, err
}
ecosystem, err := PurlTypeToEcosystem(instance.Type)
if err != nil {
return nil, err
}
pd := lockfile.PackageDetails{
Ecosystem: ecosystem,
Name: purlBuildLockfilePackageName(ecosystem, instance.Namespace, instance.Name),
Version: instance.Version,
}
return &purlResponseWrapper{
pd: pd,
instance: instance,
}, nil
}
func purlBuildLockfilePackageName(ecosystem lockfile.Ecosystem, group, name string) string {
if group == "" {
return name
}
switch ecosystem {
case lockfile.GoEcosystem, lockfile.NpmEcosystem:
return fmt.Sprintf("%s/%s", group, name)
case lockfile.MavenEcosystem:
return fmt.Sprintf("%s:%s", group, name)
default:
return name
}
}
func PurlTypeToEcosystem(purlType string) (lockfile.Ecosystem, error) {
knownTypes := map[string]lockfile.Ecosystem{
packageurl.TypeCargo: lockfile.CargoEcosystem,
packageurl.TypeComposer: lockfile.ComposerEcosystem,
packageurl.TypeGolang: lockfile.GoEcosystem,
packageurl.TypeMaven: lockfile.MavenEcosystem,
packageurl.TypeNPM: lockfile.NpmEcosystem,
packageurl.TypeNuget: lockfile.NuGetEcosystem,
packageurl.TypeGem: lockfile.BundlerEcosystem,
packageurl.TypePyPi: lockfile.PipEcosystem,
"pip": lockfile.PipEcosystem,
"go": lockfile.GoEcosystem,
"rubygems": lockfile.BundlerEcosystem,
}
ecosystem, ok := knownTypes[purlType]
if !ok {
return lockfile.Ecosystem(""),
fmt.Errorf("failed to map PURL type:%s to known ecosystem", purlType)
}
return ecosystem, nil
}