github.com/linapex/ethereum-dpos-chinese@v0.0.0-20190316121959-b78b3a4a1ece/cmd/ethkey/changepassphrase.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 12:09:27</date>
    10  //</624342589151121408>
    11  
    12  package main
    13  
    14  import (
    15  	"fmt"
    16  	"io/ioutil"
    17  	"strings"
    18  
    19  	"github.com/ethereum/go-ethereum/accounts/keystore"
    20  	"github.com/ethereum/go-ethereum/cmd/utils"
    21  	"gopkg.in/urfave/cli.v1"
    22  )
    23  
    24  var newPassphraseFlag = cli.StringFlag{
    25  	Name:  "newpasswordfile",
    26  	Usage: "the file that contains the new passphrase for the keyfile",
    27  }
    28  
    29  var commandChangePassphrase = cli.Command{
    30  	Name:      "changepassphrase",
    31  	Usage:     "change the passphrase on a keyfile",
    32  	ArgsUsage: "<keyfile>",
    33  	Description: `
    34  Change the passphrase of a keyfile.`,
    35  	Flags: []cli.Flag{
    36  		passphraseFlag,
    37  		newPassphraseFlag,
    38  	},
    39  	Action: func(ctx *cli.Context) error {
    40  		keyfilepath := ctx.Args().First()
    41  
    42  //从文件中读取密钥。
    43  		keyjson, err := ioutil.ReadFile(keyfilepath)
    44  		if err != nil {
    45  			utils.Fatalf("Failed to read the keyfile at '%s': %v", keyfilepath, err)
    46  		}
    47  
    48  //
    49  		passphrase := getPassphrase(ctx)
    50  		key, err := keystore.DecryptKey(keyjson, passphrase)
    51  		if err != nil {
    52  			utils.Fatalf("Error decrypting key: %v", err)
    53  		}
    54  
    55  //获取新密码。
    56  		fmt.Println("Please provide a new passphrase")
    57  		var newPhrase string
    58  		if passFile := ctx.String(newPassphraseFlag.Name); passFile != "" {
    59  			content, err := ioutil.ReadFile(passFile)
    60  			if err != nil {
    61  				utils.Fatalf("Failed to read new passphrase file '%s': %v", passFile, err)
    62  			}
    63  			newPhrase = strings.TrimRight(string(content), "\r\n")
    64  		} else {
    65  			newPhrase = promptPassphrase(true)
    66  		}
    67  
    68  //
    69  		newJson, err := keystore.EncryptKey(key, newPhrase, keystore.StandardScryptN, keystore.StandardScryptP)
    70  		if err != nil {
    71  			utils.Fatalf("Error encrypting with new passphrase: %v", err)
    72  		}
    73  
    74  //然后写新的关键文件代替旧的关键文件。
    75  		if err := ioutil.WriteFile(keyfilepath, newJson, 600); err != nil {
    76  			utils.Fatalf("Error writing new keyfile to disk: %v", err)
    77  		}
    78  
    79  //不要打印任何内容。成功返回，
    80  //生成一个正的退出代码。
    81  		return nil
    82  	},
    83  }
    84