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pwgen.js
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pwgen.js
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/**
* Get the value of the flag
*/
const pick = flag => {
const index = process.argv.indexOf(flag) + 1
if (!index) return undefined
return process.argv[index]
}
/**
* Check for existence of a given flag
*/
const exists = flag => {
return process.argv.includes(flag)
}
/**
* Get a random character from a set of characters
*/
const getRandomCharacter = (set) => {
return set[Math.floor(Math.random() * (set.length - 1))]
}
/**
* Generate a password
*/
const generatePassword = (length, alphabet) => {
let result = []
while (length--) {
result.push(getRandomCharacter(alphabet))
}
return result.join('')
}
if (exists('-h') || exists('--help')) {
console.log('usage: pw [-l num] [-n num] [--no-upper] [--no-digits]')
process.exit()
}
const length = pick('-l') || 20
let quantity = pick('-n') || 1
let alphabet = 'abcdefghijklmnopqrstuvwxyz'
if (!exists('--no-upper')) {
alphabet += alphabet.toUpperCase()
}
if (!exists('--no-digits')) {
alphabet += '1234567890'
}
while (quantity--) {
console.log(generatePassword(length, alphabet))
}