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prompter.go
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prompter.go
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package cmd
import (
"bufio"
"fmt"
"os"
"os/signal"
"strings"
"syscall"
"golang.org/x/term"
)
//go:generate mockery --quiet --name Prompter --output ./mocks/ --case=underscore
// Prompter implements the Prompt function to be used to display at
// the console.
type Prompter interface {
Prompt(string) string
PasswordPrompt(string) string
IsTerminal() bool
}
// terminalPrompter is used to display and read input from the user.
type terminalPrompter struct{}
// NewTerminalPrompter prompts the user via terminal.
func NewTerminalPrompter() Prompter {
return terminalPrompter{}
}
// Prompt displays the prompt for the user to enter the password and
// reads their input.
func (tp terminalPrompter) Prompt(prompt string) string {
reader := bufio.NewReader(os.Stdin)
fmt.Print(prompt)
line, err := reader.ReadString('\n')
if err != nil {
fmt.Print(err)
os.Exit(1)
}
clearLine()
return strings.TrimSpace(line)
}
// PasswordPrompt displays the prompt for the user to enter the password and
// reads their input.
func (tp terminalPrompter) PasswordPrompt(prompt string) string {
var rval string
withTerminalResetter(func() {
fmt.Print(prompt)
bytePwd, err := term.ReadPassword(int(os.Stdin.Fd()))
if err != nil {
fmt.Print(err)
os.Exit(1)
}
clearLine()
rval = string(bytePwd)
})
return rval
}
// IsTerminal checks if the current process is executing in a terminal, this
// should be used to decide when to use PasswordPrompt.
func (tp terminalPrompter) IsTerminal() bool {
return term.IsTerminal(int(os.Stdout.Fd()))
}
// Explicitly reset terminal state in the event of a signal (CTRL+C)
// to ensure typed characters are echoed in terminal:
// https://groups.google.com/forum/#!topic/Golang-nuts/kTVAbtee9UA
func withTerminalResetter(f func()) {
osSafeStdin := int(os.Stdin.Fd())
initialTermState, err := term.GetState(osSafeStdin)
if err != nil {
fmt.Print(err)
os.Exit(1)
}
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt, syscall.SIGTERM)
go func() {
<-c
err := term.Restore(osSafeStdin, initialTermState)
if err != nil {
fmt.Printf("Error restoring terminal: %v", err)
}
os.Exit(1)
}()
f()
signal.Stop(c)
}
func clearLine() {
fmt.Printf("\r" + strings.Repeat(" ", 60) + "\r")
}