How to Simulate `getpasswd` Functionality in Go?

How to Implement getpasswd Functionality in Go?

In Go, there is no built-in function similar to getpasswd that allows you to read a password from stdin without echoing it to the terminal. However, there are techniques you can use to achieve similar functionality.

Best Practice Solution

The recommended approach is to use a combination of Go packages:

import (
    "bufio"
    "fmt"
    "golang.org/x/term"
)

Step 1: Read Username

fmt.Print("Enter Username: ")
username, _ := bufio.NewReader(os.Stdin).ReadString('\n')

Step 2: Read Password (Without Echo)

fmt.Print("Enter Password: ")
bytePassword, _ := term.ReadPassword(int(syscall.Stdin))

The term.ReadPassword() function takes the file descriptor of the standard input (stdin) and returns a slice of bytes representing the password typed by the user. It suppresses any character echo on the terminal to ensure the password remains confidential.

Step 3: Convert Bytes to String

password := string(bytePassword)

Step 4: Return Credentials

return strings.TrimSpace(username), strings.TrimSpace(password)

Example Code:

package main

import (
    "bufio"
    "fmt"
    "os"
    "strings"
    "syscall"

    "golang.org/x/term"
)

func main() {
    username, password, _ := credentials()
    fmt.Printf("Username: %s, Password: %s\n", username, password)
}

func credentials() (string, string, error) {
    reader := bufio.NewReader(os.Stdin)

    fmt.Print("Enter Username: ")
    username, err := reader.ReadString('\n')
    if err != nil {
        return "", "", err
    }

    fmt.Print("Enter Password: ")
    bytePassword, err := term.ReadPassword(int(syscall.Stdin))
    if err != nil {
        return "", "", err
    }

    password := string(bytePassword)
    return strings.TrimSpace(username), strings.TrimSpace(password), nil
}

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