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import re
from urllib.parse import urlsplit
from django.core.exceptions import ValidationError
from django.core.validators import URLValidator
from django.utils.encoding import force_str
class URIValidator(URLValidator):
scheme_re = r"^(?:[a-z][a-z0-9\.\-\+]*)://"
dotless_domain_re = r"(?!-)[A-Z\d-]{1,63}(?<!-)"
host_re = "|".join(
(r"(?:" + URLValidator.host_re, URLValidator.ipv4_re, URLValidator.ipv6_re, dotless_domain_re + ")")
)
port_re = r"(?::\d{2,5})?"
path_re = r"(?:[/?#][^\s]*)?"
regex = re.compile(scheme_re + host_re + port_re + path_re, re.IGNORECASE)
class AllowedURIValidator(URIValidator):
# TODO: find a way to get these associated with their form fields in place of passing name
# TODO: submit PR to get `cause` included in the parent class ValidationError params`
def __init__(self, schemes, name, allow_path=False, allow_query=False, allow_fragments=False):
"""
:param schemes: List of allowed schemes. E.g.: ["https"]
:param name: Name of the validated URI. It is required for validation message. E.g.: "Origin"
:param allow_path: If URI can contain path part
:param allow_query: If URI can contain query part
:param allow_fragments: If URI can contain fragments part
"""
super().__init__(schemes=schemes)
self.name = name
self.allow_path = allow_path
self.allow_query = allow_query
self.allow_fragments = allow_fragments
def __call__(self, value):
value = force_str(value)
try:
scheme, netloc, path, query, fragment = urlsplit(value)
except ValueError as e:
raise ValidationError(
"%(name)s URI validation error. %(cause)s: %(value)s",
params={"name": self.name, "value": value, "cause": e},
)
# send better validation errors
if scheme not in self.schemes:
raise ValidationError(
"%(name)s URI Validation error. %(cause)s: %(value)s",
params={"name": self.name, "value": value, "cause": "invalid_scheme"},
)
if query and not self.allow_query:
raise ValidationError(
"%(name)s URI validation error. %(cause)s: %(value)s",
params={"name": self.name, "value": value, "cause": "query string not allowed"},
)
if fragment and not self.allow_fragments:
raise ValidationError(
"%(name)s URI validation error. %(cause)s: %(value)s",
params={"name": self.name, "value": value, "cause": "fragment not allowed"},
)
if path and not self.allow_path:
raise ValidationError(
"%(name)s URI validation error. %(cause)s: %(value)s",
params={"name": self.name, "value": value, "cause": "path not allowed"},
)
try:
super().__call__(value)
except ValidationError as e:
raise ValidationError(
"%(name)s URI validation error. %(cause)s: %(value)s",
params={"name": self.name, "value": value, "cause": e},
)
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