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package attestations
import (
"strings"
"github.com/pkg/errors"
"github.com/tonistiigi/go-csvvalue"
)
const (
KeyTypeSbom = "sbom"
KeyTypeProvenance = "provenance"
)
const (
defaultSBOMGenerator = "docker/buildkit-syft-scanner:stable-1"
)
func Filter(v map[string]string) map[string]string {
attests := make(map[string]string)
for k, v := range v {
if strings.HasPrefix(k, "attest:") {
attests[k] = v
continue
}
if strings.HasPrefix(k, "build-arg:BUILDKIT_ATTEST_") {
attests[k] = v
continue
}
}
return attests
}
func Validate(values map[string]map[string]string) (map[string]map[string]string, error) {
for k := range values {
if k != KeyTypeSbom && k != KeyTypeProvenance {
return nil, errors.Errorf("unknown attestation type %q", k)
}
}
return values, nil
}
func Parse(values map[string]string) (map[string]map[string]string, error) {
attests := make(map[string]string)
for k, v := range values {
if strings.HasPrefix(k, "attest:") {
attests[strings.ToLower(strings.TrimPrefix(k, "attest:"))] = v
continue
}
if strings.HasPrefix(k, "build-arg:BUILDKIT_ATTEST_") {
attests[strings.ToLower(strings.TrimPrefix(k, "build-arg:BUILDKIT_ATTEST_"))] = v
continue
}
}
out := make(map[string]map[string]string)
for k, v := range attests {
attrs := make(map[string]string)
out[k] = attrs
if k == KeyTypeSbom {
attrs["generator"] = defaultSBOMGenerator
}
if v == "" {
continue
}
fields, err := csvvalue.Fields(v, nil)
if err != nil {
return nil, errors.Wrapf(err, "failed to parse %s", k)
}
for _, field := range fields {
parts := strings.SplitN(field, "=", 2)
if len(parts) != 2 {
parts = append(parts, "")
}
attrs[parts[0]] = parts[1]
}
}
return Validate(out)
}
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