95 lines
2.5 KiB
Go
95 lines
2.5 KiB
Go
// GoPass
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// Author: Maximilian Patterson
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package main
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import (
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"crypto/rand"
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"fmt"
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"math/big"
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"os"
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"strconv"
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"strings"
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)
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var allowedCharacters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890`~!@#$%^&*()_+[]\\{}|;':,./<>?")
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const (
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Version = "1.3.0"
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symbols = "`~!@#$%^&*()_+[]\\{}|;':,./<>?"
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)
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func matchArguments(args []string) string {
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// If there are no arguments
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if len(args) == 0 {
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return "No password length specified! (ex: gopass 16)"
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}
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// First argument is special, must be an integer, -v, or -h
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var size = 0 // Password length
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err := error(nil)
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if size, err = strconv.Atoi(args[0]); err == nil { // If first argument is an integer
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} else if args[0] == "-v" {
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return "GoPass version " + Version
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} else if args[0] == "-h" {
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return "GoPass - A simple password generator written in Go\n" +
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"Usage: gopass [length] [disallowed characters] [optional remove symbols -s]\n" +
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" Example: gopass 16\n" +
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" Example: gopass 16 -r=abc123!@#\n" +
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" Example: gopass 16 -s\n" +
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"\nFor help (this output): gopass -h\n" +
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"For version: gopass -v\n"
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}
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for i := 1; i < len(args); i++ {
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v := args[i]
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if v == "-s" {
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removeDisallowed([]rune(symbols))
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} else if strings.HasPrefix(v, "-r=") { // If argument starts with -r=
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// Remove all characters after the = until next whitespace
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removeDisallowed([]rune(v[2:]))
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} else {
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return "Invalid argument (\"" + v + "\") supplied! (Type gopass -h for help)"
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}
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}
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if size <= 0 {
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return "No/invalid password length specified! (ex: gopass 16)"
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} else {
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return generatePassword(size)
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}
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}
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// Remove all disallowed characters from the allowedCharacters slice
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func removeDisallowed(disallowed []rune) {
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for _, r := range disallowed {
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for i, v := range allowedCharacters {
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if v == r {
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allowedCharacters = append(allowedCharacters[:i], allowedCharacters[i+1:]...)
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}
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}
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}
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}
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func generatePassword(size int) string {
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// Make empty array of runes with size of size
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pass := make([]rune, size)
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// Assign every slot of pass to a random allowedCharacter
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for i := range pass {
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// Generate a random int greater than 0 and not to exceed the length of allowedCharacters
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index, err := rand.Int(rand.Reader, big.NewInt(int64(len(allowedCharacters))))
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if err != nil {
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println("Error securely generating random character!")
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return ""
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}
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pass[i] = allowedCharacters[index.Int64()]
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}
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return string(pass)
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}
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func main() {
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// Process arguments
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fmt.Println(matchArguments(os.Args[1:]))
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}
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