How to Implement Non-Echoing Password Entry in Go?

Non-Echoing Password Entry in Go

Situation:

Retrieving a password from the user without displaying the entered characters is a common requirement. How can this be achieved in Go?

Solution:

Go does not directly offer a getpasswd functionality. However, the following approach effectively accomplishes the task:

Implementation Details

1. Disable Echo: To suppress character echo, the term package is imported. term.ReadPassword is utilized to read the password while concealing user input.
2. Get Username: The script prompts the user for a username using fmt.Print. The bufio.NewReader is used to read the username.
3. Get Password: term.ReadPassword is used to obtain the password after prompting the user for it. Passwords entered by the user are not visible in the console.
4. Trim Whitespace: The obtained username and password are trimmed to remove any leading or trailing whitespace.

Example:

package main

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

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

func credentials() (string, string, error) {
    fmt.Print("Enter Username: ")
    r := bufio.NewReader(os.Stdin)
    u, err := r.ReadString('\n')
    if err != nil {
        return "", "", err
    }

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

    p := string(bp)
    return strings.TrimSpace(u), strings.TrimSpace(p), nil
}

This code snippet demonstrates the process of obtaining username and password from the user without displaying the password characters.

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