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Handling Sessions Objects With A Custom Session Manager !!TOP!!

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Handling Sessions Objects With A Custom Session Manager !!TOP!!

By default, Django serializes session data using JSON. You can use theSESSION_SERIALIZER setting to customize the session serializationformat. Even with the caveats described in Write your own serializer, we highlyrecommend sticking with JSON serialization especially if you are using thecookie backend.

Note that the JSONSerializercannot handle arbitrary Python data types. As is often the case, there is atrade-off between convenience and security. If you wish to store more advanceddata types including datetime and Decimal in JSON backed sessions, youwill need to write a custom serializer (or convert such values to a JSONserializable object before storing them in request.session). Whileserializing these values is often straightforward(DjangoJSONEncoder may be helpful),writing a decoder that can reliably get back the same thing that you put in ismore fragile. For example, you run the risk of returning a datetime thatwas actually a string that just happened to be in the same format chosen fordatetimes).

The standard django.contrib.auth.logout() function actually does a bitmore than this to prevent inadvertent data leakage. It calls theflush() method of request.session.We are using this example as a demonstration of how to work with sessionobjects, not as a full logout() implementation.

When working with sessions internally, Django uses a session store object fromthe corresponding session engine. By convention, the session store object classis named SessionStore and is located in the module designated bySESSION_ENGINE.

The example below shows a custom database-backed session engine that includesan additional database column to store an account ID (thus providing an optionto query the database for all active sessions for an account):

The above securityManager.sessionManager.sessionDAO = $sessionDAO assignment only works when using a Shiro native session manager. Web applications by default do not use a native session manager and instead retain the Servlet Container 's default session manager which does not support a SessionDAO. If you would like to enable a SessionDAO in a web-based application for custom session storage or session clustering, you will have to first configure a native web session manager. For example:

Sessions must be validated so any invalid (expired or stopped) sessions can be deleted from the session data store. This ensures that the data store does not fill up over time with sessions that will never be used again.

The name of the user account to start sessions with on Linux managed nodes when the runAsEnabled input is set to true. The user account you specify for this input must exist on the managed nodes you will be connecting to; otherwise, sessions will fail to start.

The preferences you specify per operating system to apply within sessions such as shell preferences, environment variables, working directories, and running multiple commands when a session is started.

Due to the way this custom test client class is implemented, you may have todisable session protection to have your tests work properly. If sessionprotection is enabled, login sessions will be marked non-fresh in basic modeor outright rejected in strong mode when performing requests with the testclient.

To showcase each callback function I will override the default session handling behavior to instead store them within a MySQL database. The basic schema for the table should include a field for the session ID, a field for the data and a field to determine the time the session was last accessed.

In its default session handling capability, the session_destroy() function will clear the $_SESSION array of all data. The documentation on states that any global variables or cookies (if they are used) will not cleared, so if you are using a custom session handler you can perform these tasks in this callback also.

Please note: In order for Jetty to successfully persist your sess


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