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terminal.go
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terminal.go
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// Copyright 2015 Keybase, Inc. All rights reserved. Use of
// this source code is governed by the included BSD license.
package client
import (
"github.com/keybase/client/go/libkb"
"github.com/keybase/client/go/minterm"
keybase1 "github.com/keybase/client/go/protocol"
"io"
"sync"
)
type Terminal struct {
once sync.Once // protects opening the minterm
engine *minterm.MinTerm
}
func NewTerminal() (*Terminal, error) {
return &Terminal{}, nil
}
func (t *Terminal) open() error {
var err error
t.once.Do(func() {
if t.engine != nil {
return
}
var eng *minterm.MinTerm
eng, err = minterm.New()
if err != nil {
return
}
t.engine = eng
return
})
return err
}
func (t *Terminal) Shutdown() error {
if t.engine == nil {
return nil
}
return t.engine.Shutdown()
}
func (t *Terminal) PromptPassword(s string) (string, error) {
if err := t.open(); err != nil {
return "", err
}
return t.engine.PromptPassword(s)
}
func (t *Terminal) Write(s string) error {
if err := t.open(); err != nil {
return err
}
return t.engine.Write(s)
}
func (t *Terminal) Prompt(s string) (string, error) {
if err := t.open(); err != nil {
return "", err
}
s, err := t.engine.Prompt(s)
if err == minterm.ErrPromptInterrupted {
err = libkb.CanceledError{M: "input canceled"}
}
return s, err
}
func (t *Terminal) PromptYesNo(p string, def libkb.PromptDefault) (ret bool, err error) {
if err := t.open(); err != nil {
return false, err
}
var ch string
switch def {
case libkb.PromptDefaultNeither:
ch = "[y/n]"
case libkb.PromptDefaultYes:
ch = "[Y/n]"
case libkb.PromptDefaultNo:
ch = "[y/N]"
}
prompt := p + " " + ch + " "
done := false
for !done && err == nil {
var s string
if s, err = t.Prompt(prompt); err != nil {
} else if libkb.IsYes(s) {
ret = true
done = true
} else if libkb.IsNo(s) {
ret = false
done = true
} else if libkb.IsEmpty(s) {
if def == libkb.PromptDefaultNo {
ret = false
done = true
} else if def == libkb.PromptDefaultYes {
ret = true
done = true
}
}
}
return
}
// GetSize tries to get the size for the current terminal.
// It if fails it returns 80x24
func (t *Terminal) GetSize() (int, int) {
if err := t.open(); err != nil {
return 80, 24
}
return t.engine.Size()
}
func (t *Terminal) GetSecret(arg *keybase1.SecretEntryArg) (res *keybase1.SecretEntryRes, err error) {
if err := t.open(); err != nil {
return nil, err
}
desc := arg.Desc
prompt := arg.Prompt
canceled := false
if len(arg.Err) > 0 {
G.Log.Error(arg.Err)
}
if len(desc) > 0 {
if err = t.Write(desc + "\n"); err != nil {
return
}
}
var txt string
txt, err = t.PromptPassword(prompt)
if err == io.EOF || err == minterm.ErrPromptInterrupted || len(txt) == 0 {
err = nil
res = &keybase1.SecretEntryRes{Canceled: true}
canceled = true
} else if err == nil {
res = &keybase1.SecretEntryRes{Text: txt}
}
if arg.UseSecretStore && !canceled && err == nil {
// TODO: Default to 'No' and dismiss the question for
// about a day if 'No' is selected.
res.StoreSecret, err = t.PromptYesNo(libkb.GetTerminalPrompt(), libkb.PromptDefaultYes)
if err != nil {
return
}
}
return
}