github.com/linapex/ethereum-go-chinese@v0.0.0-20190316121929-f8b7a73c3fa1/accounts/abi/bind/auth.go (about)

     1  
     2  //<developer>
     3  //    <name>linapex 曹一峰</name>
     4  //    <email>linapex@163.com</email>
     5  //    <wx>superexc</wx>
     6  //    <qqgroup>128148617</qqgroup>
     7  //    <url>https://jsq.ink</url>
     8  //    <role>pku engineer</role>
     9  //    <date>2019-03-16 19:16:30</date>
    10  //</624450059613769728>
    11  
    12  
    13  package bind
    14  
    15  import (
    16  	"crypto/ecdsa"
    17  	"errors"
    18  	"io"
    19  	"io/ioutil"
    20  
    21  	"github.com/ethereum/go-ethereum/accounts/keystore"
    22  	"github.com/ethereum/go-ethereum/common"
    23  	"github.com/ethereum/go-ethereum/core/types"
    24  	"github.com/ethereum/go-ethereum/crypto"
    25  )
    26  
    27  //newTransactior是一种实用方法，可以轻松地从中创建事务签名者
    28  //加密的JSON密钥流和相关的密码短语。
    29  func NewTransactor(keyin io.Reader, passphrase string) (*TransactOpts, error) {
    30  	json, err := ioutil.ReadAll(keyin)
    31  	if err != nil {
    32  		return nil, err
    33  	}
    34  	key, err := keystore.DecryptKey(json, passphrase)
    35  	if err != nil {
    36  		return nil, err
    37  	}
    38  	return NewKeyedTransactor(key.PrivateKey), nil
    39  }
    40  
    41  //NewKeyedTransactor是一种实用方法，可以轻松创建事务签名者
    42  //从单个私钥。
    43  func NewKeyedTransactor(key *ecdsa.PrivateKey) *TransactOpts {
    44  	keyAddr := crypto.PubkeyToAddress(key.PublicKey)
    45  	return &TransactOpts{
    46  		From: keyAddr,
    47  		Signer: func(signer types.Signer, address common.Address, tx *types.Transaction) (*types.Transaction, error) {
    48  			if address != keyAddr {
    49  				return nil, errors.New("not authorized to sign this account")
    50  			}
    51  			signature, err := crypto.Sign(signer.Hash(tx).Bytes(), key)
    52  			if err != nil {
    53  				return nil, err
    54  			}
    55  			return tx.WithSignature(signer, signature)
    56  		},
    57  	}
    58  }
    59