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from urllib.parse import urlsplit
from flask import current_app
from wtforms import ValidationError
from ..url_security import AddressResolutionError, is_public_url
class NotEqualTo:
"""
Compares the values of two fields.
:param fieldname:
The name of the other field to compare to.
:param message:
Error message to raise in case of a validation error. Can be
interpolated with `%(other_label)s` and `%(other_name)s` to provide a
more helpful error.
"""
def __init__(self, fieldname, message=None):
self.fieldname = fieldname
self.message = message
def __call__(self, form, field):
try:
other = form[self.fieldname]
except KeyError as exc:
raise ValidationError(
field.gettext("Invalid field name '%s'.") % self.fieldname
) from exc
if field.data != other.data:
return
d = {
"other_label": hasattr(other, "label")
and other.label.text
or self.fieldname,
"other_name": self.fieldname,
}
message = self.message
if message is None:
message = field.gettext("Field must not be equal to %(other_name)s.")
raise ValidationError(message % d)
class AllowedHostname:
def __init__(self, message=None):
self.message = message
def __call__(self, form, field):
if (
urlsplit(field.data).hostname
in current_app.config["WEBMENTIONS_SSG_ALLOWED_HOSTNAMES"]
):
return
message = self.message
if self.message is None:
message = field.gettext("Invalid input.")
raise ValidationError(message)
class PublicURL:
def __init__(self, message=None):
self.message = message
def __call__(self, form, field):
message = self.message
if message is None:
message = field.gettext("URL must resolve to a public address.")
try:
if not is_public_url(field.data):
raise ValidationError(message)
except (AddressResolutionError, ValueError) as exc:
raise ValidationError(message) from exc
|
