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/
auth.go
77 lines (72 loc) · 2.06 KB
/
auth.go
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package main
/*
* auth.go
* Handle fake authentication
* by J. Stuart McMurray
* Created 20150815
* Last Modified 20150815
*/
/*
* ntsh -- The "Nice Try" shell
* version 0.0.1, August 15, 2015
*
* Copyright (C) 2015 Stuart McMurray and Josiah Hamilton
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*
* Stuart McMurray Josiah Hamilton
* kd5pbo@gmail.com dev.x.josiah@mamber.net
*/
import (
"bufio"
"fmt"
"io"
"strings"
"unicode"
)
/* Auth does fake authentication, if user or pass are set, it'll only allow
that specific username or password. Auth returns nil on successful auth. */
func Auth(in bufio.Scanner) (u, p string, err error) {
u, err = NextString("Username", in)
if err != nil {
return
}
p, err = NextString("Password", in)
return
}
/* Get the next string from a scanner after printing a prompt, or an error */
func NextString(p string, s bufio.Scanner) (string, error) {
fmt.Printf("%v: ", p)
/* See if there's anything to scan */
if !s.Scan() {
/* If not, return why */
e := s.Err()
if nil == e {
e = io.EOF
}
return "", e
}
/* Return the last printable chunk */
f := strings.FieldsFunc(
s.Text(),
func(r rune) bool { return !unicode.IsGraphic(r) },
)
if 0 == len(f) {
return "", nil
}
return f[len(f)-1], nil
}