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ui.go
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ui.go
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package ui
import (
"fmt"
"os"
"syscall"
"text/template"
"github.com/chzyer/readline"
"github.com/manifoldco/promptui"
"github.com/pkg/errors"
"github.com/smallstep/cli/crypto/randutil"
)
// stderr implements an io.WriteCloser that skips the terminal bell character
// (ASCII code 7), and writes the rest to os.Stderr. It's used to replace
// readline.Stdout, that is the package used by promptui to display the prompts.
type stderr struct{}
// Write implements an io.WriterCloser over os.Stderr, but it skips the terminal
// bell character.
func (s *stderr) Write(b []byte) (int, error) {
if len(b) == 1 && b[0] == readline.CharBell {
return 0, nil
}
return os.Stderr.Write(b)
}
// Close implements an io.WriterCloser over os.Stderr.
func (s *stderr) Close() error {
return os.Stderr.Close()
}
func init() {
readline.Stdout = &stderr{}
}
// Printf uses templates to print the string formated to os.Stderr.
func Printf(format string, args ...interface{}) error {
text := fmt.Sprintf(format, args...)
t, err := template.New("Printf").Funcs(promptui.FuncMap).Parse(text)
if err != nil {
return errors.Wrap(err, "error parsing template")
}
if err := t.Execute(os.Stderr, nil); err != nil {
return errors.Wrap(err, "error executing template")
}
return nil
}
// Println uses templates to print the given arguments to os.Stderr
func Println(args ...interface{}) error {
text := fmt.Sprintln(args...)
t, err := template.New("Println").Funcs(promptui.FuncMap).Parse(text)
if err != nil {
return errors.Wrap(err, "error parsing template")
}
if err := t.Execute(os.Stderr, nil); err != nil {
return errors.Wrap(err, "error executing template")
}
return nil
}
// PrintSelected prints the given name and value as if they were selected from a
// promptui.Select.
func PrintSelected(name, value string, opts ...Option) error {
o := &options{
printTemplate: PrintSelectedTemplate(),
}
o.apply(opts)
t, err := template.New(name).Funcs(promptui.FuncMap).Parse(o.printTemplate)
if err != nil {
return errors.Wrap(err, "error parsing template")
}
data := struct {
Name string
Value string
}{name, value}
if err := t.Execute(os.Stderr, data); err != nil {
return errors.Wrap(err, "error executing template")
}
return nil
}
// Prompt creates a runs a promptui.Prompt with the given label.
func Prompt(label string, opts ...Option) (string, error) {
o := &options{
promptTemplates: PromptTemplates(),
}
o.apply(opts)
// Return value if set
if o.value != "" {
return o.getValue()
}
// Prompt using the terminal
clean, err := preparePromptTerminal()
if err != nil {
return "", err
}
defer clean()
prompt := &promptui.Prompt{
Label: label,
Default: o.defaultValue,
AllowEdit: o.allowEdit,
Validate: o.validateFunc,
Templates: o.promptTemplates,
}
value, err := prompt.Run()
if err != nil {
return "", errors.Wrap(err, "error running prompt")
}
return value, nil
}
// PromptPassword creates a runs a promptui.Prompt with the given label. This
// prompt will mask the key entries with \r.
func PromptPassword(label string, opts ...Option) ([]byte, error) {
// Using a not printable character as they work better than \r
o := &options{
mask: 1,
promptTemplates: SimplePromptTemplates(),
}
o.apply(opts)
// Return value if set
if o.value != "" {
return o.getValueBytes()
}
// Prompt using the terminal
clean, err := preparePromptTerminal()
if err != nil {
return nil, err
}
defer clean()
prompt := &promptui.Prompt{
Label: label,
Mask: o.mask,
Default: o.defaultValue,
AllowEdit: o.allowEdit,
Validate: o.validateFunc,
Templates: o.promptTemplates,
}
pass, err := prompt.Run()
if err != nil {
return nil, errors.Wrap(err, "error reading password")
}
return []byte(pass), nil
}
// PromptPasswordGenerate creaes a runs a promptui.Prompt with the given label.
// This prompt will mask the key entries with \r. If the result password length
// is 0, it will generate a new prompt with a generated password that can be
// edited.
func PromptPasswordGenerate(label string, opts ...Option) ([]byte, error) {
pass, err := PromptPassword(label, opts...)
if err != nil || len(pass) > 0 {
return pass, err
}
passString, err := randutil.ASCII(32)
if err != nil {
return nil, err
}
passString, err = Prompt("Password", WithDefaultValue(passString), WithAllowEdit(true), WithValidateNotEmpty())
if err != nil {
return nil, err
}
return []byte(passString), nil
}
// Select creates and runs a promptui.Select with the given label and items.
func Select(label string, items interface{}, opts ...Option) (int, string, error) {
o := &options{
selectTemplates: SelectTemplates(label),
}
o.apply(opts)
clean, err := prepareSelectTerminal()
if err != nil {
return 0, "", err
}
defer clean()
prompt := &promptui.Select{
Label: label,
Items: items,
Templates: o.selectTemplates,
}
n, s, err := prompt.Run()
if err != nil {
return 0, "", errors.Wrap(err, "error running prompt")
}
return n, s, nil
}
func preparePromptTerminal() (func(), error) {
nothing := func() {}
if !readline.IsTerminal(syscall.Stdin) {
tty, err := os.Open("/dev/tty")
if err != nil {
return nothing, errors.Wrap(err, "error allocating terminal")
}
clean := func() {
tty.Close()
}
fd := int(tty.Fd())
state, err := readline.MakeRaw(fd)
if err != nil {
defer clean()
return nothing, errors.Wrap(err, "error making raw terminal")
}
stdin := readline.Stdin
readline.Stdin = tty
clean = func() {
readline.Stdin = stdin
readline.Restore(fd, state)
tty.Close()
}
return clean, nil
}
return nothing, nil
}
func prepareSelectTerminal() (func(), error) {
nothing := func() {}
if !readline.IsTerminal(syscall.Stdin) {
tty, err := os.Open("/dev/tty")
if err != nil {
return nothing, errors.Wrap(err, "error allocating terminal")
}
clean := func() {
tty.Close()
}
fd := int(tty.Fd())
state, err := readline.MakeRaw(fd)
if err != nil {
defer clean()
return nothing, errors.Wrap(err, "error making raw terminal")
}
stdin := os.Stdin
os.Stdin = tty
clean = func() {
os.Stdin = stdin
readline.Restore(fd, state)
tty.Close()
}
return clean, nil
}
return nothing, nil
}