/
SecretString.go
84 lines (71 loc) · 1.64 KB
/
SecretString.go
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// =================================================================
//
// Copyright (C) 2020 Spatial Current, Inc. - All Rights Reserved
// Released as open source under the MIT License. See LICENSE file.
//
// =================================================================
package prompt
import (
"bytes"
"fmt"
"os"
"os/signal"
"syscall"
"golang.org/x/crypto/ssh/terminal"
)
func SecretString(question string, stdout bool, loop bool) (string, error) {
if len(question) > 0 {
if stdout {
_, _ = fmt.Fprintf(os.Stdout, "%s: ", question)
} else {
_, _ = fmt.Fprintf(os.Stderr, "%s: ", question)
}
}
oldState, err := terminal.MakeRaw(0)
if err != nil {
return "", fmt.Errorf("error making terminal raw: %w", err)
}
value := ""
var inputErr error
done := make(chan bool, 1)
signals := make(chan os.Signal, 1)
signal.Notify(signals, syscall.SIGINT, syscall.SIGTERM, syscall.SIGPIPE)
go func() {
for s := range signals {
signal.Stop(signals)
inputErr = fmt.Errorf("received signal %q", s)
done <- true
}
}()
go func() {
for {
b, err := terminal.ReadPassword(int(os.Stdin.Fd()))
if err != nil {
inputErr = fmt.Errorf("error reading secret string from terminal: %w", err)
break
}
str := string(bytes.TrimSpace(b))
if len(str) == 0 && loop {
continue
}
value = str
break
}
// stop waiting
done <- true
signal.Stop(signals)
close(signals)
}()
<-done
signal.Stop(signals)
if oldState != nil {
_ = terminal.Restore(0, oldState)
}
// add new line
if stdout {
_, _ = fmt.Fprintln(os.Stdout, "")
} else {
_, _ = fmt.Fprintln(os.Stderr, "")
}
return value, inputErr
}