100 lines
2.6 KiB
Python
100 lines
2.6 KiB
Python
import urllib
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import re
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import anunidecode # Don't listen to pylint's lies. This import is required for unidecode below.
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from uuid import uuid4
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REPOSITORY_NAME_REGEX = re.compile(r'^[\.a-zA-Z0-9_-]{1,255}$')
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VALID_TAG_PATTERN = r'[\w][\w.-]{0,127}'
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FULL_TAG_PATTERN = r'^[\w][\w.-]{0,127}$'
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TAG_REGEX = re.compile(FULL_TAG_PATTERN)
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TAG_ERROR = ('Invalid tag: must match [A-Za-z0-9_.-], NOT start with "." or "-", '
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'and can contain 1-128 characters')
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class ImplicitLibraryNamespaceNotAllowed(Exception):
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""" Exception raised if the implicit library namespace was specified but is
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not allowed. """
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pass
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def escape_tag(tag, default='latest'):
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""" Escapes a Docker tag, ensuring it matches the tag regular expression. """
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if not tag:
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return default
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tag = re.sub(r'^[^\w]', '_', tag)
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tag = re.sub(r'[^\w\.-]', '_', tag)
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return tag[0:127]
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def parse_namespace_repository(repository, library_namespace, include_tag=False,
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allow_library=True):
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repository = repository.encode('unidecode', 'ignore')
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parts = repository.rstrip('/').split('/', 1)
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if len(parts) < 2:
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namespace = library_namespace
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repository = parts[0]
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if not allow_library:
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raise ImplicitLibraryNamespaceNotAllowed()
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else:
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(namespace, repository) = parts
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if include_tag:
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parts = repository.split(':', 1)
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if len(parts) < 2:
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tag = 'latest'
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else:
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(repository, tag) = parts
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repository = urllib.quote_plus(repository)
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if include_tag:
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return (namespace, repository, tag)
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return (namespace, repository)
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def format_robot_username(parent_username, robot_shortname):
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return '%s+%s' % (parent_username, robot_shortname)
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def parse_robot_username(robot_username):
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if not '+' in robot_username:
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return None
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return robot_username.split('+', 2)
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def parse_urn(urn):
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""" Parses a URN, returning a pair that contains a list of URN
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namespace parts, followed by the URN's unique ID.
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"""
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if not urn.startswith('urn:'):
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return None
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parts = urn[len('urn:'):].split(':')
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return (parts[0:len(parts) - 1], parts[len(parts) - 1])
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def parse_single_urn(urn):
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""" Parses a URN, returning a pair that contains the first
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namespace part, followed by the URN's unique ID.
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"""
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result = parse_urn(urn)
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if result is None or not len(result[0]):
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return None
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return (result[0][0], result[1])
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uuid_generator = lambda: str(uuid4())
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def urn_generator(namespace_portions, id_generator=uuid_generator):
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prefix = 'urn:%s:' % ':'.join(namespace_portions)
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def generate_urn():
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return prefix + id_generator()
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return generate_urn
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