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main.go
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main.go
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package main
import (
"flag"
"fmt"
"os"
"strings"
"go.1password.io/spg"
)
const (
usage = `
Usage: mkpw [options]
Generates a memorable, but secure password.
Options:
-size=<n>
Generate a password with <n> words (default: 5)
-separator=<class>
Separate components using <class> seperator. Can be one of: hyphen, space,
comma, period, underscore, digit, none. (default: hyphen)
-capitalize=<scheme>
Capitalize password according to <scheme>. Scheme can be one of: none,
first, all, random, one. (default: one)
-entropy
Show the entropy of the password recipe
`
)
func main() {
var size int
var separator, capitalize string
var entropy bool
flags := flag.NewFlagSet("mkpw", flag.ContinueOnError)
flags.IntVar(&size, "size", 5, "size")
flags.StringVar(&separator, "separator", "hyphen", "separator")
flags.StringVar(&capitalize, "capitalize", "one", "capitalize")
flags.BoolVar(&entropy, "entropy", false, "entropy")
flags.Usage = func() {
fmt.Fprintln(os.Stderr, strings.TrimSpace(usage))
}
if err := flags.Parse(os.Args[1:]); err != nil {
os.Exit(1)
}
sep, err := parseSeparator(separator)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
cap, err := parseCapitalize(capitalize)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
wl, err := spg.NewWordList(spg.AgileWords)
if err != nil {
fmt.Fprintf(os.Stderr, "error setting up word list: %s\n", err)
os.Exit(1)
}
recipe := spg.NewWLRecipe(size, wl)
recipe.Capitalize = cap
recipe.SeparatorFunc = sep
p, err := recipe.Generate()
if err != nil {
fmt.Fprintf(os.Stderr, "error generating password: %s\n", err)
os.Exit(1)
}
if entropy {
fmt.Printf("Password: %s\nEntropy: %.3f\n", p, p.Entropy)
} else {
fmt.Printf("%s\n", p)
}
}
func parseSeparator(separator string) (spg.SFFunction, error) {
var f spg.SFFunction
var err error
switch separator {
case "hyphen":
f = makeSeparatorFunc("-")
err = nil
break
case "space":
f = makeSeparatorFunc(" ")
err = nil
break
case "comma":
f = makeSeparatorFunc(",")
err = nil
break
case "dot":
f = makeSeparatorFunc(".")
err = nil
break
case "underscore":
f = makeSeparatorFunc("_")
err = nil
break
case "digit":
f = spg.SFDigits1
err = nil
break
case "none":
f = spg.SFNone
err = nil
break
default:
f = nil
err = fmt.Errorf("invalid separator: %q", separator)
}
return f, err
}
func makeSeparatorFunc(value string) spg.SFFunction {
return func() (string, spg.FloatE) {
return value, 0
}
}
func parseCapitalize(capitalize string) (spg.CapScheme, error) {
var scheme spg.CapScheme
var err error
switch capitalize {
case "none":
fallthrough
case "first":
fallthrough
case "one":
fallthrough
case "all":
fallthrough
case "capitalize":
fallthrough
case "random":
scheme = spg.CapScheme(capitalize)
err = nil
break
default:
scheme = ""
err = fmt.Errorf("invalid capitalization scheme: %q", capitalize)
}
return scheme, err
}