🔑 Generates and validates random url-safe user-readable strings.

keysmith.py

from os import urandom
from base64 import b64encode
from string import ascii_letters, digits


def randkey(size=6, altchars=b'+.', ambiguous=b'IlO9GUS'):
    key = ''
    while len(key) < size:
        chunk = b64encode(urandom(size*2), altchars)
        key += str(bytes([c for c in chunk if c not in ambiguous]), encoding='utf-8')
    return key[:size]


def verikey(key, size=6, altchars='+.', validchars=ascii_letters+digits):
    alphabet = validchars + altchars
    return len(key) == size and len(list(filter(lambda c: c not in alphabet, key))) == 0