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// Copyright 2017 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"strings"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/console"
"github.com/ethereum/go-ethereum/crypto"
"gopkg.in/urfave/cli.v1"
)
// getPassPhrase obtains a passphrase given by the user. It first checks the
// --passphrase command line flag and ultimately prompts the user for a
// passphrase.
func getPassPhrase(ctx *cli.Context, confirmation bool) string {
// Look for the --passphrase flag.
passphraseFile := ctx.String(passphraseFlag.Name)
if passphraseFile != "" {
content, err := ioutil.ReadFile(passphraseFile)
if err != nil {
utils.Fatalf("Failed to read passphrase file '%s': %v",
passphraseFile, err)
}
return strings.TrimRight(string(content), "\r\n")
}
// Otherwise prompt the user for the passphrase.
passphrase, err := console.Stdin.PromptPassword("Passphrase: ")
if err != nil {
utils.Fatalf("Failed to read passphrase: %v", err)
}
if confirmation {
confirm, err := console.Stdin.PromptPassword("Repeat passphrase: ")
if err != nil {
utils.Fatalf("Failed to read passphrase confirmation: %v", err)
}
if passphrase != confirm {
utils.Fatalf("Passphrases do not match")
}
}
return passphrase
}
// signHash is a helper function that calculates a hash for the given message
// that can be safely used to calculate a signature from.
//
// The hash is calulcated as
// keccak256("\x19Ethereum Signed Message:\n"${message length}${message}).
//
// This gives context to the signed message and prevents signing of transactions.
func signHash(data []byte) []byte {
msg := fmt.Sprintf("\x19Ethereum Signed Message:\n%d%s", len(data), data)
return crypto.Keccak256([]byte(msg))
}
// mustPrintJSON prints the JSON encoding of the given object and
// exits the program with an error message when the marshaling fails.
func mustPrintJSON(jsonObject interface{}) {
str, err := json.MarshalIndent(jsonObject, "", " ")
if err != nil {
utils.Fatalf("Failed to marshal JSON object: %v", err)
}
fmt.Println(string(str))
}
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