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common.go
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common.go
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//
// Copyright 2021 The Sigstore Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cosign
import (
"bufio"
"errors"
"fmt"
"os"
"strings"
"syscall"
"golang.org/x/term"
)
// skipConfirmation is a global variable to store whether or not the user has provided
// the --yes flag to skip all confirmation prompts
var skipConfirmation bool
func SetSkipConfirmation(skip bool) {
skipConfirmation = skip
}
// TODO need to centralize this logic
func FileExists(filename string) bool {
info, err := os.Stat(filename)
if os.IsNotExist(err) {
return false
}
return !info.IsDir()
}
func ConfirmPrompt(msg string) (bool, error) {
if skipConfirmation {
return skipConfirmation, nil
}
fmt.Fprintf(os.Stderr, "%s\n\nAre you sure you want to continue? [Y/n]: ", msg)
reader := bufio.NewReader(os.Stdin)
r, err := reader.ReadString('\n')
if err != nil {
return false, err
}
return strings.Trim(r, "\n") == "Y", nil
}
func GetPassFromTerm(confirm bool) ([]byte, error) {
fmt.Fprint(os.Stderr, "Enter password for private key: ")
// Unnecessary convert of syscall.Stdin on *nix, but Windows is a uintptr
// nolint:unconvert
pw1, err := term.ReadPassword(int(syscall.Stdin))
if err != nil {
return nil, err
}
fmt.Fprintln(os.Stderr)
if !confirm {
return pw1, nil
}
fmt.Fprint(os.Stderr, "Enter password for private key again: ")
// Unnecessary convert of syscall.Stdin on *nix, but Windows is a uintptr
// nolint:unconvert
confirmpw, err := term.ReadPassword(int(syscall.Stdin))
fmt.Fprintln(os.Stderr)
if err != nil {
return nil, err
}
if string(pw1) != string(confirmpw) {
return nil, errors.New("passwords do not match")
}
return pw1, nil
}
func IsTerminal() bool {
stat, _ := os.Stdin.Stat()
return (stat.Mode() & os.ModeCharDevice) != 0
}