25165adbc1
* Move all Django code into contrib.django_util. * Add DjangORMStorage. This is backwards compatible with old django_orm storage. * Add new functionality to decorators and views that integrate with Django ORM-based storage. * Fix issue where Django storage always creates new Models. * Move tests into Django package and have them create an actual test app to create test databases etc. * Remove FlowField.
76 lines
2.4 KiB
Python
76 lines
2.4 KiB
Python
# Copyright 2016 Google Inc. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Contains classes used for the Django ORM storage."""
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import base64
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import pickle
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from django.db import models
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from django.utils import encoding
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import oauth2client
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class CredentialsField(models.Field):
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"""Django ORM field for storing OAuth2 Credentials."""
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def __init__(self, *args, **kwargs):
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if 'null' not in kwargs:
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kwargs['null'] = True
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super(CredentialsField, self).__init__(*args, **kwargs)
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def get_internal_type(self):
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return 'BinaryField'
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def from_db_value(self, value, expression, connection, context):
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"""Overrides ``models.Field`` method. This converts the value
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returned from the database to an instance of this class.
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"""
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return self.to_python(value)
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def to_python(self, value):
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"""Overrides ``models.Field`` method. This is used to convert
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bytes (from serialization etc) to an instance of this class"""
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if value is None:
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return None
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elif isinstance(value, oauth2client.client.Credentials):
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return value
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else:
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return pickle.loads(base64.b64decode(encoding.smart_bytes(value)))
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def get_prep_value(self, value):
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"""Overrides ``models.Field`` method. This is used to convert
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the value from an instances of this class to bytes that can be
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inserted into the database.
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"""
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if value is None:
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return None
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else:
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return encoding.smart_text(base64.b64encode(pickle.dumps(value)))
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def value_to_string(self, obj):
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"""Convert the field value from the provided model to a string.
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Used during model serialization.
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Args:
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obj: db.Model, model object
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Returns:
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string, the serialized field value
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"""
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value = self._get_val_from_obj(obj)
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return self.get_prep_value(value)
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