import time
from cryptography import fernet
from aiohttp import web
from aiohttp_session import setup, get_session
from aiohttp_session.cookie_storage import EncryptedCookieStorage


async def handler(request):
    session = await get_session(request)
    last_visit = session['last_visit'] if 'last_visit' in session else None
    session['last_visit'] = time.time()
    text = 'Last visited: {}'.format(last_visit)
    return web.Response(text=text)


def make_app():
    app = web.Application()
    fernet_key = fernet.Fernet.generate_key()
    f = fernet.Fernet(fernet_key)
    setup(app, EncryptedCookieStorage(f))
    app.router.add_get('/', handler)
    return app


web.run_app(make_app())

All storages use an HTTP Cookie named AIOHTTP_SESSION for storing data. This can be modified by passing the keyword argument cookie_name to the storage class of your choice.

Available session storages are:

aiohttp_session.SimpleCookieStorage() -- keeps session data as a plain JSON string in the cookie body. Use the storage only for testing purposes, it's very non-secure.
aiohttp_session.cookie_storage.EncryptedCookieStorage(secret_key) -- stores the session data into a cookie as SimpleCookieStorage but encodes it via AES cipher. secrect_key is a bytes key for AES encryption/decryption, the length should be 32 bytes.

Requires cryptography library::
```
$ pip install aiohttp_session[secure]
```
aiohttp_session.redis_storage.RedisStorage(redis_pool) -- stores JSON encoded data in redis, keeping only the redis key (a random UUID) in the cookie. redis_pool is a redis object, created by await aioredis.from_url(...) call.
```
$ pip install aiohttp_session[aioredis]
```

Developing

Install for local development::

$ make setup

Run linters::

$ make lint

Run tests::

$ make test

Third party extensions

aiohttp_session_mongo <https://github.com/alexpantyukhin/aiohttp-session-mongo>_
aiohttp_session_dynamodb <https://github.com/alexpantyukhin/aiohttp-session-dynamodb>_

License

aiohttp_session is offered under the Apache 2 license.

.. towncrier release notes start

2.12.1 (2024-09-25)

Minor typing fix for aiohttp 3.10+.
Dropped support for Python 3.7. Started testing on 3.11 - 3.13.

2.12.0 (2022-10-28)

Migrated from aioredis to redis (if using redis without installing aiohttp-session[aioredis] then it will be necessary to manually install redis).

2.11.0 (2021-01-31)

Support initialising EncryptedCookieStorage with Fernet object directly.
Fix an issue where the session would get reset before the cookie expiry.

2.10.0 (2021-12-30)

Typing support
Add samesite cookie option
Support aioredis 2

2.9.0 (2019-11-04)

Fix memcached expiring time (#398)

2.8.0 (2019-09-17)

Make this compatible with Python 3.7+. Import from collections.abc, instead of from collections. (#373)

2.7.0 (2018-10-13)

Reset a session if the session age > max_age (#331)
Reset a session on TTL expiration for EncryptedCookieStorage (#326)

2.6.0 (2018-09-12)

Create a new session if NaClCookieStorage cannot decode a corrupted cookie (#317)

2.5.0 (2018-05-12)

Add an API for requesting new session explicitly (#281)

2.4.0 (2018-05-04)

Fix a bug for session fixation (#272)

2.3.0 (2018-02-13)

Support custom encoder and decoder by all storages (#252)
Bump to aiohttp 3.0

2.2.0 (2018-01-31)

Fixed the formatting of an error handling bad middleware return types. (#249)

2.1.0 (2017-11-24)

Add session.set_new_identity() method for changing identity for a new session (#236)

2.0.1 (2017-11-22)

Replace assertions in aioredis installation checks by RuntimeError (#235)

2.0.0 (2017-11-21)

Update to aioredis 1.0+. The aiohttp-session 2.0 is not compatible with aioredis 0.X (#234)

1.2.1 (2017-11-20)

Pin aioredis<1.0 (#231)

1.2.0 (2017-11-06)

Add MemcachedStorage (#224)

1.1.0 (2017-11-03)

Upgrade middleware to new style from aiohttp 2.3+

1.0.1 (2017-09-13)

Add key_factory attribute for redis_storage (#205)

1.0.0 (2017-07-27)

Catch decoder exception in RedisStorage on data load (#175)
Specify domain and path on cookie deletion (#171)

0.8.0 (2016-12-04)

Use time.time() instead of time.monotonic() for absolute times (#81)

0.7.0 (2016-09-24)

Fix tests to be compatible with aiohttp upstream API for client cookies

0.6.0 (2016-09-08)

Add expires field automatically to support older browsers (#43)
Respect session.max_age in redis storage #45
Always pass default max_age from storage into session (#45)

0.5.0 (2016-02-21)

Handle cryptography.fernet.InvalidToken exception by providing an empty session (#29)

0.4.0 (2016-01-06)

Add optional NaCl encrypted storage (#20)
Relax EncryptedCookieStorage to accept base64 encoded string, e.g. generated by Fernet.generate_key.
Add setup() function
Save the session even on exception in the middleware chain

0.3.0 (2015-11-20)

Reflect aiohttp changes: minimum required Python version is 3.4.1
Use explicit 'aiohttp_session' package

0.2.0 (2015-09-07)

Add session.created property (#14)
Replaced PyCrypto with crypthography library (#16)

0.1.2 (2015-08-07)

Add manifest file (#15)

0.1.1 (2015-04-20)

Fix #7: stop cookie name growing each time session is saved

0.1.0 (2015-04-13)

First public release

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