How do sessions expire

The standard django. It calls the flush method of request. We are using this example as a demonstration of how to work with session objects, not as a full logout implementation. The examples in this section import the SessionStore object directly from the django. This is necessary because the dictionary is stored in an encoded format:. By default, Django only saves to the session database when the session has been modified — that is if any of its dictionary values have been assigned or deleted:.

In the last case of the above example, we can tell the session object explicitly that it has been modified by setting the modified attribute on the session object:. When set to True , Django will save the session to the database on every single request. Note that the session cookie is only sent when a session has been created or modified. Similarly, the expires part of a session cookie is updated each time the session cookie is sent.

You can control whether the session framework uses browser-length sessions vs. Use this if you want people to have to log in every time they open a browser. Some browsers Chrome, for example provide settings that allow users to continue browsing sessions after closing and re-opening the browser.

As users create new sessions on your website, session data can accumulate in your session store. To understand this problem, consider what happens with the database backend. Django updates this row each time the session data changes. If the user logs out manually, Django deletes the row. But if the user does not log out, the row never gets deleted.

A similar process happens with the file backend. Django does not provide automatic purging of expired sessions. Django provides a clean-up management command for this purpose: clearsessions. A few Django settings give you control over session behavior:. Subdomains within a site are able to set cookies on the client for the whole domain. This makes session fixation possible if cookies are permitted from subdomains not controlled by trusted users. For example, an attacker could log into good.

If the attacker has control over bad. When you visit good. Another possible attack would be if good. When working with sessions internally, Django uses a session store object from the corresponding session engine. All SessionStore classes available in Django inherit from SessionBase and implement data manipulation methods, namely:. In order to build a custom session engine or to customize an existing one, you may create a new class inheriting from SessionBase or any other existing SessionStore class.

You can extend the session engines, but doing so with database-backed session engines generally requires some extra effort see the next section for details. Primary key. The field itself may contain up to 40 characters. The current implementation generates a character string a random sequence of digits and lowercase ASCII letters.

Expired sessions are not available to a user, however, they may still be stored in the database until the clearsessions management command is run. You can also customize the model manager by subclassing BaseSessionManager :. Customization of SessionStore classes is achieved by overriding methods and properties described below:.

You can also use session handlers from inside plugins. By setting the engine to MyPlugin. Prior to 3. You can also use your own Table class to handle the saving of the sessions:. The Cache class can be used to store sessions as well. This allows you to store sessions in a cache like APCu, or Memcached. There are some caveats to using cache sessions, in that if you exhaust the cache space, sessions will start to expire as records are evicted.

This will configure Session to use the CacheSession class as the delegate for saving the sessions. The default cache configuration is 'default'. The built-in defaults attempt to provide a common base for session configuration. You may need to tweak specific ini flags as well. CakePHP exposes the ability to customize the ini settings for both default configurations, as well as custom ones.

The ini key in the session settings, allows you to specify individual configuration values. For example you can use it to control settings like session. Creating a custom session handler is straightforward in CakePHP.

This gives us the best of fast IO of APC, without having to worry about sessions evaporating when the cache fills up. The class should look something like:. This lets us fetch sessions from the fast cache, and not have to worry about what happens when we fill the cache. Using this session handler is also easy. In your app. Now our application will start using our custom session handler for reading and writing session data.

You can access the session data any place you have access to a request object. This means the session is accessible from:. Active Oldest Votes. Improve this answer. Hmm, I guess it's an unsupported feature then because I did reduce the timeout to 15 mins on my dev org.

My job still ran successfully 20 mins later. Looks like I need to get my head in the docs re OAuth, I did start down that route but couldn't fathom a way to get the initial token without having the user do something this is kind of a workaround. Thanks, you have answered the question metadaddy. Another pattern I've seen is for a server app to start a web server, open the browser to localhost or whatever , do OAuth web server flow, then stop the web server.

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