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package main
import (
"context"
"flag"
"fmt"
"encoding/base64"
"github.com/golang/glog"
"github.com/system-transparency/stfe/client"
"github.com/system-transparency/stfe/types"
)
var (
sthStr = flag.String("sth", "", "base64-encoded StItem of type StFormatSignedTreeHeadV1 (default: fetch new sth)")
leafHashStr = flag.String("leaf_hash", "", "base64-encoded leaf hash")
)
func main() {
flag.Parse()
defer glog.Flush()
client, err := client.NewClientFromFlags()
if err != nil {
glog.Errorf("NewClientFromFlags: %v", err)
return
}
leafHash, sth, err := newParamsFromFlags(client)
if err != nil {
glog.Errorf("NewRequestFromFlags: %v", err)
return
}
proof, err := client.GetProofByHash(context.Background(), leafHash, sth)
if err != nil {
glog.Errorf("GetProofByHash: %v", err)
return
}
serialized, err := types.Marshal(*proof)
if err != nil {
glog.Errorf("Marshal: %v", err)
}
fmt.Println("proof:", base64.StdEncoding.EncodeToString(serialized))
}
func newParamsFromFlags(client *client.Client) ([]byte, *types.StItem, error) {
serialized, err := base64.StdEncoding.DecodeString(*sthStr)
if err != nil {
return nil, nil, fmt.Errorf("sth: DecodeString: %v", err)
}
var item types.StItem
if err = types.Unmarshal(serialized, &item); err != nil {
return nil, nil, fmt.Errorf("sth: Unmarshal: %v", err)
} else if got, want := item.Format, types.StFormatSignedTreeHeadV1; got != want {
return nil, nil, fmt.Errorf("unexpected StItem format: %v", got)
}
leafHash, err := base64.StdEncoding.DecodeString(*leafHashStr)
if err != nil {
return nil, nil, fmt.Errorf("leaf_hash: DecodeString: %v", err)
} else if got, want := len(leafHash), 32; got != want {
return nil, nil, fmt.Errorf("leaf_hash: unexpected size: %v", got)
}
glog.V(3).Infof("created request parameters TreeSize(%d) and LeafHash(%s)", item.SignedTreeHeadV1.TreeHead.TreeSize, *leafHashStr)
return leafHash, &item, nil
}
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