WP Bouncer

Description

WP Bouncer restricts the number of simultaneous logins for your WordPress users. It aims to deter people from sharing their login credentials for your site, which is especially important for a paid membership site.

How it Works

• The plugin stores a random FAKESESSID for each user when they log in.
• If a user is logged in, on each page load (init hook), WP Bouncer checks if the FAKESESSID stored in the user’s cookies is the same as the last login stored in a transient (fakesessid_user_login).
• If the two values do no match, WP Bouncer logs the user out and redirects them to a warning message.
• If the WP_BOUNCER_HEARTBEAT_CHECK is defined to true, JavaScript will be loaded to bounce users when a new user logs in with the same login. This is useful for sites with page caching.

Admin accounts (specifically users with the “manage_options” capability) are excluded from bounces.

Allow a Specific Number of Active Sessions

By default, WP Bouncer only allows one session per user. But, you can use this plugin to offer bulk memberships to corporate, education, or other group-type customers via a shared login.

Use the wp_bouncer_number_simultaneous_logins filter to allow a defined number of active “sessions”.

View the Recipe

Example Use Case

• User A logs in as “user”. Their FAKESESSID, say “SESSION_A” is stored in a WordPress option.
• User B logs in as “user”. Their FAKESESSID, say “SESSION_B” is overwrites the stored WordPress option.
• User A tries to load a page on your site, WP Bouncer catches them and logs them out, redirecting them to the warning message.
• User B can browse around the site as normal… unless…
• User A logs in again as “user”. Their FAKESESSID, “SESSION_A_v2” is stored in the WordPress option.
• Now user B would be logged out if they load another page.

Hooks and Filters

• wp_bouncer_ignore_admins filter: if returning false even admins will be bounced.
• wp_bouncer_redirect_url filter: can be used to change the URL redirected to after being bounced.
• wp_bouncer_number_simultaneous_logins filter: can be set to limit logins to a number other than 1. 0 means unlimited logins.
• wp_bouncer_login_flag: runs right before bouncing (can be used to potentially stop the bouncing).
• wp_bouncer_session_ids hook: used to filter session ids when saving them. Passes $session_ids, $old_session_ids (before any were removed/bounced), and the current user’s ID as parameters.
• wp_bouncer_session_length hook: used to filter how long the session ids transients are set. This way, you can time the transients to expire at a specific time of day. Note that the transient is saved on every page load, so if you set it to 5 minutes, it’s going to push it out 5 minutes on every page load. You should try to set it to (the number of seconds until midnight) or something like that.

Future Improvements

• Settings page to choose where users are taken after being bounced.
• Keep track of how many bounces there are and lock the account down if there are so many in a small time frame.

Support the Plugin Authors

If you like this plugin, please check out Jason’s work with Paid Memberships Pro (http://www.paidmembershipspro.com) and Andrew’s work at Reaktiv Studios (http://reaktivstudios.com/).