Attempt to modernize the repo

example_test.go

@@ -4,50 +4,49 @@ import (
 	"bufio"
 	"errors"
 	"fmt"
-	"log"
 	"os"
 
-	"github.com/bgentry/speakeasy"
 	"github.com/msteinert/pam"
+	"golang.org/x/term"
 )
 
-// This example uses whatever default PAM service configuration is available
-// on the system, and tries to authenticate any user. This should cause PAM
-// to ask its conversation handler for a username and password, in sequence.
-//
-// This application will handle those requests by displaying the
-// PAM-provided prompt and sending back the first line of stdin input
-// it can read for each.
-//
-// Keep in mind that unless run as root (or setuid root), the only
-// user's authentication that can succeed is that of the process owner.
-func Example_authenticate() {
+// This example uses the default PAM service to authenticate any users. This
+// should cause PAM to ask its conversation handler for a username and password
+// in sequence.
+func Example() {
 	t, err := pam.StartFunc("", "", func(s pam.Style, msg string) (string, error) {
 		switch s {
 		case pam.PromptEchoOff:
-			return speakeasy.Ask(msg)
-		case pam.PromptEchoOn:
-			fmt.Print(msg + " ")
-			input, err := bufio.NewReader(os.Stdin).ReadString('\n')
+			fmt.Print(msg)
+			pw, err := term.ReadPassword(int(os.Stdin.Fd()))
 			if err != nil {
 				return "", err
 			}
-			return input[:len(input)-1], nil
+			fmt.Println()
+			return string(pw), nil
+		case pam.PromptEchoOn:
+			fmt.Print(msg)
+			s := bufio.NewScanner(os.Stdin)
+			s.Scan()
+			return s.Text(), nil
 		case pam.ErrorMsg:
-			log.Print(msg)
+			fmt.Fprintf(os.Stderr, "%s\n", msg)
 			return "", nil
 		case pam.TextInfo:
 			fmt.Println(msg)
 			return "", nil
+		default:
+			return "", errors.New("unrecognized message style")
 		}
-		return "", errors.New("Unrecognized message style")
 	})
 	if err != nil {
-		log.Fatalf("Start: %s", err.Error())
+		fmt.Fprintf(os.Stderr, "start: %s\n", err.Error())
+		os.Exit(1)
 	}
 	err = t.Authenticate(0)
 	if err != nil {
-		log.Fatalf("Authenticate: %s", err.Error())
+		fmt.Fprintf(os.Stderr, "authenticate: %s\n", err.Error())
+		os.Exit(1)
 	}
-	fmt.Println("Authentication succeeded!")
+	fmt.Println("authentication succeeded!")
 }