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quay/util/validation.py

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import string
import re
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import anunidecode # Don't listen to pylint's lies. This import is required.
INVALID_PASSWORD_MESSAGE = 'Invalid password, password must be at least ' + \
'8 characters and contain no whitespace.'
INVALID_USERNAME_CHARACTERS = r'[^a-z0-9_]'
VALID_CHARACTERS = string.digits + string.lowercase
MIN_LENGTH = 4
MAX_LENGTH = 30
def validate_email(email_address):
if re.match(r'[^@]+@[^@]+\.[^@]+', email_address):
return True
return False
def validate_username(username):
# Based off the restrictions defined in the Docker Registry API spec
regex_match = (re.search(INVALID_USERNAME_CHARACTERS, username) is None)
if not regex_match:
return (False, 'Username must match expression [a-z0-9_]+')
length_match = (len(username) >= MIN_LENGTH and len(username) <= MAX_LENGTH)
if not length_match:
return (False, 'Username must be between %s and %s characters in length' %
(MIN_LENGTH, MAX_LENGTH))
return (True, '')
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def validate_password(password):
# No whitespace and minimum length of 8
if re.search(r'\s', password):
return False
return len(password) > 7
def _gen_filler_chars(num_filler_chars):
if num_filler_chars == 0:
yield ''
else:
for char in VALID_CHARACTERS:
for suffix in _gen_filler_chars(num_filler_chars - 1):
yield char + suffix
def generate_valid_usernames(input_username):
# Docker's regex: [a-z0-9]+(?:[._-][a-z0-9]+)*
normalized = input_username.encode('unidecode', 'ignore').strip().lower()
prefix = re.sub(INVALID_USERNAME_CHARACTERS, '_', normalized)[:30]
prefix = re.sub(r'_{2,}', '_', prefix)
if prefix.endswith('_'):
prefix = prefix[0:len(prefix) - 1]
num_filler_chars = max(0, MIN_LENGTH - len(prefix))
while num_filler_chars + len(prefix) <= MAX_LENGTH:
for suffix in _gen_filler_chars(num_filler_chars):
yield prefix + suffix
num_filler_chars += 1