/
hctime.go
198 lines (173 loc) · 4.63 KB
/
hctime.go
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package util
import (
"bytes"
"crypto/sha256"
"crypto/tls"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"net/http"
"time"
"github.com/HcashOrg/hctime/api/v1"
"github.com/HcashOrg/hctime/merkle"
)
var (
skipVerify = true
httpClient = &http.Client{
Transport: &http.Transport{
IdleConnTimeout: 60 * time.Second,
TLSClientConfig: &tls.Config{
InsecureSkipVerify: skipVerify,
},
},
}
)
// isTimestamp determines if a string is a valid SHA256 digest.
func isDigest(digest string) bool {
return v1.RegexpSHA256.MatchString(digest)
}
func defaultTestnetHost() string {
return "https://" + NormalizeAddress(v1.DefaultTestnetTimeHost,
v1.DefaultTestnetTimePort)
}
func defaultMainnetHost() string {
return "https://" + NormalizeAddress(v1.DefaultMainnetTimeHost,
v1.DefaultMainnetTimePort)
}
// XXX duplicate function
// getError returns the error that is embedded in a JSON reply.
func getError(r io.Reader) (string, error) {
var e interface{}
decoder := json.NewDecoder(r)
if err := decoder.Decode(&e); err != nil {
return "", err
}
m, ok := e.(map[string]interface{})
if !ok {
return "", fmt.Errorf("Could not decode response")
}
rError, ok := m["error"]
if !ok {
return "", fmt.Errorf("No error response")
}
return fmt.Sprintf("%v", rError), nil
}
// Timestamp sends a Timestamp request to the provided host. The caller is
// responsible for assembling the host string based on what net to use.
func Timestamp(host string, digests []*[sha256.Size]byte) error {
// batch uploads
ts := v1.Timestamp{
ID: "hcAutonomy",
Digests: make([]string, 0, len(digests)),
}
for _, digest := range digests {
ts.Digests = append(ts.Digests, hex.EncodeToString(digest[:]))
}
b, err := json.Marshal(ts)
if err != nil {
return err
}
r, err := httpClient.Post(host+v1.TimestampRoute, "application/json",
bytes.NewReader(b))
if err != nil {
return err
}
defer r.Body.Close()
if r.StatusCode != http.StatusOK {
e, err := getError(r.Body)
if err != nil {
return fmt.Errorf("%v", r.Status)
}
return fmt.Errorf("%v: %v", r.Status, e)
}
// Decode response.
var tsReply v1.TimestampReply
decoder := json.NewDecoder(r.Body)
if err := decoder.Decode(&tsReply); err != nil {
return fmt.Errorf("Could node decode TimestampReply: %v", err)
}
for i, result := range tsReply.Results {
if result == v1.ResultExistsError {
// Been alread anchored so ignore.
continue
}
if result != v1.ResultOK {
msg, ok := v1.Result[result]
if !ok {
msg = "UNKNOWN ERROR"
}
return fmt.Errorf("anchor (%v): %v", i, msg)
}
}
return nil
}
// Verify sends a hctime Verify command to the provided host. It checks and
// validates the entire reply. A single failure is considered terminal and an
// error is returned. If the reply is valid it is returned to the caller for
// further processing. This means that the caller can be assured that all
// checks have been done and the data is readily usable.
func Verify(host string, digests []string) (*v1.VerifyReply, error) {
ver := v1.Verify{
ID: "hcAutonomy",
}
for _, digest := range digests {
if isDigest(digest) {
ver.Digests = append(ver.Digests, digest)
continue
}
return nil, fmt.Errorf("not a valid digest: %v", digest)
}
// Convert Verify to JSON
b, err := json.Marshal(ver)
if err != nil {
return nil, err
}
r, err := httpClient.Post(host+v1.VerifyRoute, "application/json",
bytes.NewReader(b))
if err != nil {
return nil, err
}
defer r.Body.Close()
if r.StatusCode != http.StatusOK {
e, err := getError(r.Body)
if err != nil {
return nil, fmt.Errorf("%v", r.Status)
}
return nil, fmt.Errorf("%v: %v", r.Status, e)
}
// Decode response.
var vr v1.VerifyReply
decoder := json.NewDecoder(r.Body)
if err := decoder.Decode(&vr); err != nil {
return nil, fmt.Errorf("Could node decode VerifyReply: %v", err)
}
for _, v := range vr.Digests {
_, ok := v1.Result[v.Result]
if !ok {
return nil, fmt.Errorf("%v invalid error code %v",
v.Digest, v.Result)
}
// Verify merkle path.
root, err := merkle.VerifyAuthPath(&v.ChainInformation.MerklePath)
if err != nil {
if err != merkle.ErrEmpty {
return nil, fmt.Errorf("%v invalid auth path "+
"%v", v.Digest, err)
}
return nil, fmt.Errorf("%v Not anchored", v.Digest)
}
// Verify merkle root.
merkleRoot, err := hex.DecodeString(v.ChainInformation.MerkleRoot)
if err != nil {
return nil, fmt.Errorf("invalid merkle root: %v", err)
}
// This is silly since we check against returned root.
if !bytes.Equal(root[:], merkleRoot) {
return nil, fmt.Errorf("%v invalid merkle root",
v.Digest)
}
// All good
}
return &vr, nil
}