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example sending signed transaction with pinned server cert #32

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77 changes: 77 additions & 0 deletions examples/send-multioperator-orderflow/main.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,77 @@
package main

// This example demonstrates sending a signed eth_sendRawTransaction request to a
// multioperator builder node with a specific server certificate.

import (
"context"
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"net/http"

"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/flashbots/go-utils/rpcclient"
"github.com/flashbots/go-utils/rpctypes"
"github.com/flashbots/go-utils/signature"
)

var (
// Builder node endpoint and certificate
endpoint = "https://127.0.0.1:443"
certPEM = []byte("-----BEGIN CERTIFICATE-----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\n1WlX3whjllaqr33K7kAa9ntihWfo+VB9zg==\n-----END CERTIFICATE-----\n")

// Transaction and signing key
rawTxHex = "0x02f8710183195414808503a1e38a30825208947804a60641a89c9c3a31ab5abea2a18c2b6b48408788c225841b2a9f80c080a0df68a9664190a59005ab6d6cc6b8e5a1e25604f546c36da0fd26ddd44d8f7d50a05b1bcfab22a3017cabb305884d081171e0f23340ae2a13c04eb3b0dd720a0552"
signerPrivateKey = "0xaccc869c5c3cb397e4833d41b138d3528af6cc5ff4808bb85a1c2ce1c8f04007"
)

func createTransportForSelfSignedCert(certPEM []byte) (*http.Transport, error) {
certPool := x509.NewCertPool()
if ok := certPool.AppendCertsFromPEM(certPEM); !ok {
return nil, errors.New("failed to add certifcate to pool")
}
return &http.Transport{
TLSClientConfig: &tls.Config{
RootCAs: certPool,
MinVersion: tls.VersionTLS12,
},
}, nil
}

func exampleSendRawTx() error {
requestSigner, err := signature.NewSignerFromHexPrivateKey(signerPrivateKey)
if err != nil {
return err
}

transport, err := createTransportForSelfSignedCert(certPEM)
if err != nil {
return err
}

client := rpcclient.NewClientWithOpts(endpoint, &rpcclient.RPCClientOpts{
HTTPClient: &http.Client{
Transport: transport,
},
Signer: requestSigner,
})

rawTransaction := hexutil.MustDecode(rawTxHex)
resp, err := client.Call(context.Background(), "eth_sendRawTransaction", rpctypes.EthSendRawTransactionArgs(rawTransaction))
if err != nil {
return err
}
if resp != nil && resp.Error != nil {
return fmt.Errorf("rpc error: %s", resp.Error.Error())
}
return nil
}

func main() {
err := exampleSendRawTx()
if err != nil {
panic(err)
}
}
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