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120 lines
4.2 KiB
120 lines
4.2 KiB
import warnings
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from datetime import datetime
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from datetime import timedelta as TimeDelta
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from typing import Optional
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from flask import Flask
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from itsdangerous import want_bytes
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from pymongo import MongoClient, version
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from ..base import ServerSideSession, ServerSideSessionInterface
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from ..defaults import Defaults
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class MongoDBSession(ServerSideSession):
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pass
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class MongoDBSessionInterface(ServerSideSessionInterface):
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"""A Session interface that uses mongodb as session storage. (`pymongo` required)
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:param client: A ``pymongo.MongoClient`` instance.
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:param key_prefix: A prefix that is added to all storage keys.
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:param use_signer: Whether to sign the session id cookie or not.
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:param permanent: Whether to use permanent session or not.
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:param sid_length: The length of the generated session id in bytes.
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:param serialization_format: The serialization format to use for the session data.
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:param db: The database to use.
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:param collection: The collection to use.
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.. versionadded:: 0.7
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The `serialization_format` and `app` parameters were added.
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.. versionadded:: 0.6
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The `sid_length` parameter was added.
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.. versionadded:: 0.2
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The `use_signer` parameter was added.
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"""
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session_class = MongoDBSession
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ttl = True
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def __init__(
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self,
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app: Flask,
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client: Optional[MongoClient] = Defaults.SESSION_MONGODB,
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key_prefix: str = Defaults.SESSION_KEY_PREFIX,
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use_signer: bool = Defaults.SESSION_USE_SIGNER,
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permanent: bool = Defaults.SESSION_PERMANENT,
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sid_length: int = Defaults.SESSION_ID_LENGTH,
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serialization_format: str = Defaults.SESSION_SERIALIZATION_FORMAT,
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db: str = Defaults.SESSION_MONGODB_DB,
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collection: str = Defaults.SESSION_MONGODB_COLLECT,
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):
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if client is None or not isinstance(client, MongoClient):
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warnings.warn(
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"No valid MongoClient instance provided, attempting to create a new instance on localhost with default settings.",
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RuntimeWarning,
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stacklevel=1,
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)
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client = MongoClient()
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self.client = client
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self.store = client[db][collection]
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self.use_deprecated_method = int(version.split(".")[0]) < 4
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# Create a TTL index on the expiration time, so that mongo can automatically delete expired sessions
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self.store.create_index("expiration", expireAfterSeconds=0)
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super().__init__(
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app, key_prefix, use_signer, permanent, sid_length, serialization_format
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)
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def _retrieve_session_data(self, store_id: str) -> Optional[dict]:
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# Get the saved session (document) from the database
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document = self.store.find_one({"id": store_id})
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if document:
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serialized_session_data = want_bytes(document["val"])
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return self.serializer.decode(serialized_session_data)
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return None
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def _delete_session(self, store_id: str) -> None:
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if self.use_deprecated_method:
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self.store.remove({"id": store_id})
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else:
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self.store.delete_one({"id": store_id})
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def _upsert_session(
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self, session_lifetime: TimeDelta, session: ServerSideSession, store_id: str
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) -> None:
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storage_expiration_datetime = datetime.utcnow() + session_lifetime
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# Serialize the session data
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serialized_session_data = self.serializer.encode(session)
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# Update existing or create new session in the database
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if self.use_deprecated_method:
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self.store.update(
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{"id": store_id},
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{
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"id": store_id,
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"val": serialized_session_data,
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"expiration": storage_expiration_datetime,
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},
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True,
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)
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else:
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self.store.update_one(
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{"id": store_id},
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{
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"$set": {
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"id": store_id,
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"val": serialized_session_data,
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"expiration": storage_expiration_datetime,
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}
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},
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True,
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)
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