github.com/bcnmy/go-ethereum@v1.10.27/cmd/ethkey/utils.go (about)

     1  // Copyright 2017 The go-ethereum Authors
     2  // This file is part of go-ethereum.
     3  //
     4  // go-ethereum is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // go-ethereum is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU General Public License
    15  // along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package main
    18  
    19  import (
    20  	"encoding/json"
    21  	"fmt"
    22  	"os"
    23  	"strings"
    24  
    25  	"github.com/ethereum/go-ethereum/cmd/utils"
    26  	"github.com/urfave/cli/v2"
    27  )
    28  
    29  // getPassphrase obtains a passphrase given by the user.  It first checks the
    30  // --passfile command line flag and ultimately prompts the user for a
    31  // passphrase.
    32  func getPassphrase(ctx *cli.Context, confirmation bool) string {
    33  	// Look for the --passwordfile flag.
    34  	passphraseFile := ctx.String(passphraseFlag.Name)
    35  	if passphraseFile != "" {
    36  		content, err := os.ReadFile(passphraseFile)
    37  		if err != nil {
    38  			utils.Fatalf("Failed to read password file '%s': %v",
    39  				passphraseFile, err)
    40  		}
    41  		return strings.TrimRight(string(content), "\r\n")
    42  	}
    43  
    44  	// Otherwise prompt the user for the passphrase.
    45  	return utils.GetPassPhrase("", confirmation)
    46  }
    47  
    48  // mustPrintJSON prints the JSON encoding of the given object and
    49  // exits the program with an error message when the marshaling fails.
    50  func mustPrintJSON(jsonObject interface{}) {
    51  	str, err := json.MarshalIndent(jsonObject, "", "  ")
    52  	if err != nil {
    53  		utils.Fatalf("Failed to marshal JSON object: %v", err)
    54  	}
    55  	fmt.Println(string(str))
    56  }