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