airflow validators 源码
airflow validators 代码
文件路径：/airflow/www/validators.py
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you 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.
from __future__ import annotations
import json
from json import JSONDecodeError
from wtforms.validators import EqualTo, ValidationError
class GreaterEqualThan(EqualTo):
"""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 __call__(self, form, field):
try:
other = form[self.fieldname]
except KeyError:
raise ValidationError(field.gettext(f"Invalid field name '{self.fieldname}'."))
if field.data is None or other.data is None:
return
if field.data < other.data:
message_args = {
'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(
f"Field must be greater than or equal to {message_args['other_label']}."
)
else:
message = message % message_args
raise ValidationError(message)
class ValidJson:
"""Validates data is valid JSON.
:param message:
Error message to raise in case of a validation error.
"""
def __init__(self, message=None):
self.message = message
def __call__(self, form, field):
if field.data:
try:
json.loads(field.data)
except JSONDecodeError as ex:
message = self.message or f'JSON Validation Error: {ex}'
raise ValidationError(message=field.gettext(message.format(field.data)))
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