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# -*- coding: utf-8 -*-
# Copyright (c) 2017 Ian Stapleton Cordasco
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Module containing the validation logic for rfc3986."""
from . import exceptions
from . import misc
from . import normalizers
class Validator(object):
"""Object used to configure validation of all objects in rfc3986.
.. versionadded:: 1.0
Example usage::
>>> from rfc3986 import api, validators
>>> uri = api.uri_reference('https://github.com/')
>>> validator = validators.Validator().require_presence_of(
... 'scheme', 'host', 'path',
... ).allow_schemes(
... 'http', 'https',
... ).allow_hosts(
... '127.0.0.1', 'github.com',
... )
>>> validator.validate(uri)
>>> invalid_uri = rfc3986.uri_reference('imap://mail.google.com')
>>> validator.validate(invalid_uri)
Traceback (most recent call last):
...
rfc3986.exceptions.MissingComponentError: ('path was required but
missing', URIReference(scheme=u'imap', authority=u'mail.google.com',
path=None, query=None, fragment=None), ['path'])
"""
COMPONENT_NAMES = frozenset(
["scheme", "userinfo", "host", "port", "path", "query", "fragment"]
)
def __init__(self):
"""Initialize our default validations."""
self.allowed_schemes = set()
self.allowed_hosts = set()
self.allowed_ports = set()
self.allow_password = True
self.required_components = {
"scheme": False,
"userinfo": False,
"host": False,
"port": False,
"path": False,
"query": False,
"fragment": False,
}
self.validated_components = self.required_components.copy()
def allow_schemes(self, *schemes):
"""Require the scheme to be one of the provided schemes.
.. versionadded:: 1.0
:param schemes:
Schemes, without ``://`` that are allowed.
:returns:
The validator instance.
:rtype:
Validator
"""
for scheme in schemes:
self.allowed_schemes.add(normalizers.normalize_scheme(scheme))
return self
def allow_hosts(self, *hosts):
"""Require the host to be one of the provided hosts.
.. versionadded:: 1.0
:param hosts:
Hosts that are allowed.
:returns:
The validator instance.
:rtype:
Validator
"""
for host in hosts:
self.allowed_hosts.add(normalizers.normalize_host(host))
return self
def allow_ports(self, *ports):
"""Require the port to be one of the provided ports.
.. versionadded:: 1.0
:param ports:
Ports that are allowed.
:returns:
The validator instance.
:rtype:
Validator
"""
for port in ports:
port_int = int(port, base=10)
if 0 <= port_int <= 65535:
self.allowed_ports.add(port)
return self
def allow_use_of_password(self):
"""Allow passwords to be present in the URI.
.. versionadded:: 1.0
:returns:
The validator instance.
:rtype:
Validator
"""
self.allow_password = True
return self
def forbid_use_of_password(self):
"""Prevent passwords from being included in the URI.
.. versionadded:: 1.0
:returns:
The validator instance.
:rtype:
Validator
"""
self.allow_password = False
return self
def check_validity_of(self, *components):
"""Check the validity of the components provided.
This can be specified repeatedly.
.. versionadded:: 1.1
:param components:
Names of components from :attr:`Validator.COMPONENT_NAMES`.
:returns:
The validator instance.
:rtype:
Validator
"""
components = [c.lower() for c in components]
for component in components:
if component not in self.COMPONENT_NAMES:
raise ValueError(
'"{}" is not a valid component'.format(component)
)
self.validated_components.update(
{component: True for component in components}
)
return self
def require_presence_of(self, *components):
"""Require the components provided.
This can be specified repeatedly.
.. versionadded:: 1.0
:param components:
Names of components from :attr:`Validator.COMPONENT_NAMES`.
:returns:
The validator instance.
:rtype:
Validator
"""
components = [c.lower() for c in components]
for component in components:
if component not in self.COMPONENT_NAMES:
raise ValueError(
'"{}" is not a valid component'.format(component)
)
self.required_components.update(
{component: True for component in components}
)
return self
def validate(self, uri):
"""Check a URI for conditions specified on this validator.
.. versionadded:: 1.0
:param uri:
Parsed URI to validate.
:type uri:
rfc3986.uri.URIReference
:raises MissingComponentError:
When a required component is missing.
:raises UnpermittedComponentError:
When a component is not one of those allowed.
:raises PasswordForbidden:
When a password is present in the userinfo component but is
not permitted by configuration.
:raises InvalidComponentsError:
When a component was found to be invalid.
"""
if not self.allow_password:
check_password(uri)
required_components = [
component
for component, required in self.required_components.items()
if required
]
validated_components = [
component
for component, required in self.validated_components.items()
if required
]
if required_components:
ensure_required_components_exist(uri, required_components)
if validated_components:
ensure_components_are_valid(uri, validated_components)
ensure_one_of(self.allowed_schemes, uri, "scheme")
ensure_one_of(self.allowed_hosts, uri, "host")
ensure_one_of(self.allowed_ports, uri, "port")
def check_password(uri):
"""Assert that there is no password present in the uri."""
userinfo = uri.userinfo
if not userinfo:
return
credentials = userinfo.split(":", 1)
if len(credentials) <= 1:
return
raise exceptions.PasswordForbidden(uri)
def ensure_one_of(allowed_values, uri, attribute):
"""Assert that the uri's attribute is one of the allowed values."""
value = getattr(uri, attribute)
if value is not None and allowed_values and value not in allowed_values:
raise exceptions.UnpermittedComponentError(
attribute,
value,
allowed_values,
)
def ensure_required_components_exist(uri, required_components):
"""Assert that all required components are present in the URI."""
missing_components = sorted(
[
component
for component in required_components
if getattr(uri, component) is None
]
)
if missing_components:
raise exceptions.MissingComponentError(uri, *missing_components)
def is_valid(value, matcher, require):
"""Determine if a value is valid based on the provided matcher.
:param str value:
Value to validate.
:param matcher:
Compiled regular expression to use to validate the value.
:param require:
Whether or not the value is required.
"""
if require:
return value is not None and matcher.match(value)
# require is False and value is not None
return value is None or matcher.match(value)
def authority_is_valid(authority, host=None, require=False):
"""Determine if the authority string is valid.
:param str authority:
The authority to validate.
:param str host:
(optional) The host portion of the authority to validate.
:param bool require:
(optional) Specify if authority must not be None.
:returns:
``True`` if valid, ``False`` otherwise
:rtype:
bool
"""
validated = is_valid(authority, misc.SUBAUTHORITY_MATCHER, require)
if validated and host is not None:
return host_is_valid(host, require)
return validated
def host_is_valid(host, require=False):
"""Determine if the host string is valid.
:param str host:
The host to validate.
:param bool require:
(optional) Specify if host must not be None.
:returns:
``True`` if valid, ``False`` otherwise
:rtype:
bool
"""
validated = is_valid(host, misc.HOST_MATCHER, require)
if validated and host is not None and misc.IPv4_MATCHER.match(host):
return valid_ipv4_host_address(host)
elif validated and host is not None and misc.IPv6_MATCHER.match(host):
return misc.IPv6_NO_RFC4007_MATCHER.match(host) is not None
return validated
def scheme_is_valid(scheme, require=False):
"""Determine if the scheme is valid.
:param str scheme:
The scheme string to validate.
:param bool require:
(optional) Set to ``True`` to require the presence of a scheme.
:returns:
``True`` if the scheme is valid. ``False`` otherwise.
:rtype:
bool
"""
return is_valid(scheme, misc.SCHEME_MATCHER, require)
def path_is_valid(path, require=False):
"""Determine if the path component is valid.
:param str path:
The path string to validate.
:param bool require:
(optional) Set to ``True`` to require the presence of a path.
:returns:
``True`` if the path is valid. ``False`` otherwise.
:rtype:
bool
"""
return is_valid(path, misc.PATH_MATCHER, require)
def query_is_valid(query, require=False):
"""Determine if the query component is valid.
:param str query:
The query string to validate.
:param bool require:
(optional) Set to ``True`` to require the presence of a query.
:returns:
``True`` if the query is valid. ``False`` otherwise.
:rtype:
bool
"""
return is_valid(query, misc.QUERY_MATCHER, require)
def fragment_is_valid(fragment, require=False):
"""Determine if the fragment component is valid.
:param str fragment:
The fragment string to validate.
:param bool require:
(optional) Set to ``True`` to require the presence of a fragment.
:returns:
``True`` if the fragment is valid. ``False`` otherwise.
:rtype:
bool
"""
return is_valid(fragment, misc.FRAGMENT_MATCHER, require)
def valid_ipv4_host_address(host):
"""Determine if the given host is a valid IPv4 address."""
# If the host exists, and it might be IPv4, check each byte in the
# address.
return all([0 <= int(byte, base=10) <= 255 for byte in host.split(".")])
_COMPONENT_VALIDATORS = {
"scheme": scheme_is_valid,
"path": path_is_valid,
"query": query_is_valid,
"fragment": fragment_is_valid,
}
_SUBAUTHORITY_VALIDATORS = set(["userinfo", "host", "port"])
def subauthority_component_is_valid(uri, component):
"""Determine if the userinfo, host, and port are valid."""
try:
subauthority_dict = uri.authority_info()
except exceptions.InvalidAuthority:
return False
# If we can parse the authority into sub-components and we're not
# validating the port, we can assume it's valid.
if component == "host":
return host_is_valid(subauthority_dict["host"])
elif component != "port":
return True
try:
port = int(subauthority_dict["port"])
except TypeError:
# If the port wasn't provided it'll be None and int(None) raises a
# TypeError
return True
return 0 <= port <= 65535
def ensure_components_are_valid(uri, validated_components):
"""Assert that all components are valid in the URI."""
invalid_components = set([])
for component in validated_components:
if component in _SUBAUTHORITY_VALIDATORS:
if not subauthority_component_is_valid(uri, component):
invalid_components.add(component)
# Python's peephole optimizer means that while this continue *is*
# actually executed, coverage.py cannot detect that. See also,
# https://bitbucket.org/ned/coveragepy/issues/198/continue-marked-as-not-covered
continue # nocov: Python 2.7, 3.3, 3.4
validator = _COMPONENT_VALIDATORS[component]
if not validator(getattr(uri, component)):
invalid_components.add(component)
if invalid_components:
raise exceptions.InvalidComponentsError(uri, *invalid_components)