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package main
import (
"context"
"flag"
"fmt"
"encoding/base64"
"net/http"
"github.com/golang/glog"
"github.com/system-transparency/stfe"
"github.com/system-transparency/stfe/client"
"github.com/system-transparency/stfe/descriptor"
)
var (
operators = flag.String("operators", "../../descriptor/stfe.json", "path to json-encoded list of log operators")
logId = flag.String("log_id", "AAEgFKl1V+J3ib3Aav86UgGD7GRRtcKIdDhgc0G4vVD/TGc=", "base64-encoded log identifier")
start = flag.Uint64("start", 132, "inclusive start index to download")
end = flag.Uint64("end", 137, "inclusive stop index to download")
)
func main() {
flag.Parse()
if client, err := client.NewClient(mustLoad(*operators, *logId), &http.Client{}, true, nil); err != nil {
glog.Fatal(err)
} else if items, err := getRange(client, *start, *end); err != nil {
glog.Fatal(err)
} else if err := printRange(items); err != nil {
glog.Fatal(err)
}
glog.Flush()
}
func getRange(client *client.Client, start, end uint64) ([]*stfe.StItem, error) {
items := make([]*stfe.StItem, 0, end-start+1)
for len(items) != cap(items) {
rsps, err := client.GetEntries(context.Background(), start, end)
if err != nil {
return nil, fmt.Errorf("fetching entries failed: %v", err)
}
for _, rsp := range rsps {
var item stfe.StItem
if err := item.Unmarshal(rsp.Item); err != nil {
return nil, fmt.Errorf("expected valid StItem but unmarshal failed: %v", err)
} else if item.Format != stfe.StFormatChecksumV1 {
return nil, fmt.Errorf("expected checksum_v1 but got: %v", item.Format)
}
items = append(items, &item)
}
start += uint64(len(rsps))
}
return items, nil
}
func printRange(items []*stfe.StItem) error {
for i, item := range items {
glog.V(3).Infof("Index(%d): %s", *start+uint64(i), item)
str, err := item.MarshalB64()
if err != nil {
glog.Fatalf("expected valid StItem but marshal failed: %v", err)
}
fmt.Printf("Index(%d): %s\n", *start+uint64(i), str)
}
return nil
}
func mustLoad(operators, logId string) *descriptor.Log {
ops, err := descriptor.LoadOperators(operators)
if err != nil {
glog.Fatalf("failed loading log operators: %v")
}
id, err := base64.StdEncoding.DecodeString(logId)
if err != nil {
glog.Fatalf("invalid base64 log id: %v", err)
}
log, err := descriptor.FindLog(ops, id)
if err != nil {
glog.Fatalf("unknown log id: %v", err)
}
return log
}
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