74 lines
1.5 KiB
Go
74 lines
1.5 KiB
Go
package opentimestamps
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/hex"
|
|
"fmt"
|
|
"io"
|
|
"net/http"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"github.com/btcsuite/btcd/chaincfg/chainhash"
|
|
"github.com/btcsuite/btcd/wire"
|
|
"golang.org/x/exp/slices"
|
|
)
|
|
|
|
func NewEsploraClient(url string) Bitcoin {
|
|
if strings.HasSuffix(url, "/") {
|
|
url = url[0 : len(url)-1]
|
|
}
|
|
return esplora{url}
|
|
}
|
|
|
|
type esplora struct{ baseurl string }
|
|
|
|
func (e esplora) GetBlockHash(height int64) (*chainhash.Hash, error) {
|
|
resp, err := http.Get(e.baseurl + "/block-height/" + strconv.FormatInt(height, 10))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer resp.Body.Close()
|
|
hexb, err := io.ReadAll(resp.Body)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
hash, err := hex.DecodeString(string(hexb))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if len(hash) != chainhash.HashSize {
|
|
return nil, fmt.Errorf("got block hash (%x) of invalid size (expected %d)", hash, chainhash.HashSize)
|
|
}
|
|
|
|
slices.Reverse(hash)
|
|
var chash chainhash.Hash
|
|
copy(chash[:], hash)
|
|
return &chash, nil
|
|
}
|
|
|
|
func (e esplora) GetBlockHeader(hash *chainhash.Hash) (*wire.BlockHeader, error) {
|
|
resp, err := http.Get(fmt.Sprintf("%s/block/%s/header", e.baseurl, hash.String()))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer resp.Body.Close()
|
|
hexb, err := io.ReadAll(resp.Body)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
headerHash, err := hex.DecodeString(string(hexb))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
header := &wire.BlockHeader{}
|
|
if err := header.BtcDecode(bytes.NewBuffer(headerHash), 0, 0); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return header, nil
|
|
}
|