github.com/ethxdao/go-ethereum@v0.0.0-20221218102228-5ae34a9cc189/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/ethxdao/go-ethereum/cmd/utils"
    26  )
    27  
    28  // getPassphrase obtains a passphrase given by the user.  It first checks the
    29  // --passfile command line flag and ultimately prompts the user for a
    30  // passphrase.
    31  func getPassphrase(ctx *cli.Context, confirmation bool) string {
    32  	// Look for the --passwordfile flag.
    33  	passphraseFile := ctx.String(passphraseFlag.Name)
    34  	if passphraseFile != "" {
    35  		content, err := os.ReadFile(passphraseFile)
    36  		if err != nil {
    37  			utils.Fatalf("Failed to read password file '%s': %v",
    38  				passphraseFile, err)
    39  		}
    40  		return strings.TrimRight(string(content), "\r\n")
    41  	}
    42  
    43  	// Otherwise prompt the user for the passphrase.
    44  	return utils.GetPassPhrase("", confirmation)
    45  }
    46  
    47  // mustPrintJSON prints the JSON encoding of the given object and
    48  // exits the program with an error message when the marshaling fails.
    49  func mustPrintJSON(jsonObject interface{}) {
    50  	str, err := json.MarshalIndent(jsonObject, "", "  ")
    51  	if err != nil {
    52  		utils.Fatalf("Failed to marshal JSON object: %v", err)
    53  	}
    54  	fmt.Println(string(str))
    55  }