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package stfe
import (
"fmt"
"encoding/base64"
"github.com/google/certificate-transparency-go/tls"
)
// StFormat defines a particular StItem type that is versioned
type StFormat tls.Enum
const (
StFormatReserved StFormat = 0
StFormatSignedTreeHeadV1 StFormat = 1
StFormatSignedDebugInfoV1 StFormat = 2
StFormatConsistencyProofV1 StFormat = 3
StFormatInclusionProofV1 StFormat = 4
StFormatChecksumV1 = 5
)
func (f StFormat) String() string {
switch f {
case StFormatReserved:
return "reserved"
case StFormatSignedTreeHeadV1:
return "signed_tree_head_v1"
case StFormatSignedDebugInfoV1:
return "signed_debug_info_v1"
case StFormatConsistencyProofV1:
return "consistency_proof_v1"
case StFormatInclusionProofV1:
return "inclusion_proof_v1"
case StFormatChecksumV1:
return "checksum_v1"
default:
return fmt.Sprintf("Unknown StFormat: %d", f)
}
}
// StItem references a versioned item based on a given format specifier.
type StItem struct {
Format StFormat `tls:"maxval:65535"`
ChecksumV1 *ChecksumV1 `tls:"selector:Format,val:5"`
// TODO: add more items
}
func (i StItem) String() string {
switch i.Format {
case StFormatChecksumV1:
return fmt.Sprintf("%s %s", i.Format, *i.ChecksumV1)
default:
return fmt.Sprintf("unknown StItem: %s", i.Format)
}
}
// ChecksumV1 associates a package name with an arbitrary checksum value
type ChecksumV1 struct {
Package []byte `tls:"minlen:0,maxlen:255"`
Checksum []byte `tls:"minlen:32,maxlen:255"`
}
// NewChecksumV1 creates a new StItem of type checksum_v1
func NewChecksumV1(name string, checksum []byte) (StItem, error) {
return StItem{
Format: StFormatChecksumV1,
ChecksumV1: &ChecksumV1{
Package: []byte(name),
Checksum: checksum,
},
}, nil // TODO: error handling
}
func (i ChecksumV1) String() string {
return fmt.Sprintf("%v %v", string(i.Package), base64.StdEncoding.EncodeToString(i.Checksum))
}
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