From c7e59cd6c1c94edeee44a5468bb9b77a3c5e74b6 Mon Sep 17 00:00:00 2001
From: Justin de Vesine <justin@crowdfavorite.com>
Date: Thu, 19 Jul 2012 15:13:57 -0600
Subject: [PATCH] add 0.5.2 from
 http://plugins.svn.wordpress.org/user-switching/trunk/ @r574859

---
 languages/readme.txt              |  10 +
 languages/user_switching-de_DE.mo | Bin 0 -> 1220 bytes
 languages/user_switching-fa_IR.mo | Bin 0 -> 1205 bytes
 languages/user_switching-zh_CN.mo | Bin 0 -> 1247 bytes
 readme.txt                        | 158 +++++++++
 screenshot-1.png                  | Bin 0 -> 4219 bytes
 screenshot-2.png                  | Bin 0 -> 4974 bytes
 user-switching.php                | 510 ++++++++++++++++++++++++++++++
 8 files changed, 678 insertions(+)
 create mode 100644 languages/readme.txt
 create mode 100644 languages/user_switching-de_DE.mo
 create mode 100644 languages/user_switching-fa_IR.mo
 create mode 100644 languages/user_switching-zh_CN.mo
 create mode 100644 readme.txt
 create mode 100644 screenshot-1.png
 create mode 100644 screenshot-2.png
 create mode 100644 user-switching.php

diff --git a/languages/readme.txt b/languages/readme.txt
new file mode 100644
index 0000000..e665450
--- /dev/null
+++ b/languages/readme.txt
@@ -0,0 +1,10 @@
+== For Translators ==
+
+Note: this folder contains MO files only. If you are looking for the POT or PO files, you can download them here:
+
+http://plugins.svn.wordpress.org/user-switching/assets/
+
+If you have created your own translation, or have an update of an existing one, please send it to <john@johnblackbourn.com> so I can bundle it into the next release of the plugin.
+
+Thank you.
+John.
diff --git a/languages/user_switching-de_DE.mo b/languages/user_switching-de_DE.mo
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diff --git a/readme.txt b/readme.txt
new file mode 100644
index 0000000..f8fa047
--- /dev/null
+++ b/readme.txt
@@ -0,0 +1,158 @@
+=== User Switching ===
+Contributors: johnbillion
+Donate link: http://lud.icro.us/donations/
+Tags: user, users, profiles, switching, wpmu, multisite, buddypress, become, user control, user management, user access, developer
+Requires at least: 2.7
+Tested up to: 3.4
+Stable tag: trunk
+
+Instant switching between user accounts in WordPress.
+
+== Description ==
+
+This plugin allows you to quickly swap between user accounts in WordPress at the click of a button. You'll be instantly logged out and logged in as your desired user. This is handy for test environments where you regularly log out and in between different accounts, or for adminstrators of sites who need to switch between multiple accounts.
+
+= Features =
+
+ * Switch users: Instantly switch to any user account from the *Users* screen.
+ * Switch back: Instantly switch back to your originating account.
+ * Switch off: Log out of your account but retain the ability to instantly switch back in again.
+ * It's completely secure (see the *Security* section below).
+ * Compatible with WordPress, WordPress Multisite, BuddyPress and WordPress MU.
+
+= Security =
+
+ * Only users with the ability to edit other users can switch user accounts (by default this is only Administrators). Lower level users cannot switch accounts.
+ * User switching is protected with the WordPress nonce security system, meaning only those who are allowed to switch users can switch.
+ * Full support for administration over SSL (if applicable).
+ * Passwords are not (and cannot be) revealed.
+
+= Translations Included =
+
+ * Chinese Simplified by Tunghsiao Liu (Sparanoid)
+ * German by Ralph Stenzel
+ * Farsi (Persian) by Amin Ab
+
+== Installation ==
+
+You can install this plugin directly from your WordPress dashboard:
+
+ 1. Go to the *Plugins* menu and click *Add New*.
+ 2. Search for *User Switching*.
+ 3. Click *Install Now* next to the User Switching plugin.
+ 4. Activate the plugin.
+
+Alternatively, see the guide to [Manually Installing Plugins](http://codex.wordpress.org/Managing_Plugins#Manual_Plugin_Installation).
+
+= Usage =
+
+Visit the *Users* menu in WordPress and you'll see a *Switch To* link next to each user. Clicking this will switch you into that user account. Once switched, you can switch back to your originating account via the *Switch back* link on each dashboard screen.
+
+See the FAQ for information about the *Switch Off* feature.
+
+== Frequently Asked Questions ==
+
+= What does "Switch off" mean? =
+
+Switching off logs you out of your account but retains your current user ID in a cookie so you can switch straight back (ie. log straight back in) without having to log in with your username and password. It's akin to switching to no user, and being able to switch back.
+
+The *Switch Off* link can be found in your profile menu in the WordPress toolbar. Once you've switched off you'll see a *Switch back* link in the footer of your site.
+
+= Does this plugin work with WordPress Multisite? =
+
+Yes, and you'll also be able to switch users from the Users screen in Network Admin.
+
+= Does this plugin work with BuddyPress? =
+
+Yes, and you'll also be able to switch users from the Members screens.
+
+= Does this plugin work with WordPress MU? =
+
+Yes, but you should really update to Multisite.
+
+= Does this work as a mu-plugin? =
+
+Yes, but you'll need to install `user-switching.php` into the root of your `mu-plugins` directory, not in the `user-switching` subdirectory. This is a restriction of WordPress.
+
+= What capability does a user need in order to switch accounts? =
+
+A user needs the `edit_users` capability in order to switch user accounts. By default only Administrators have this capability, and with Multisite enabled only Super Admins have this capability.
+
+== Screenshots ==
+
+1. The *Switch To* link on the Users screen
+2. The *Switch To* link on a user's profile
+
+== Changelog ==
+
+= 0.5.2 =
+* Farsi (Persian) translation by Amin Ab.
+* Display switch back links in Network Admin and login screen
+* Avoid a BuddyPress bug preventing Switch To buttons from appearing
+
+= 0.5.1.2 =
+* German translation by Ralph Stenzel.
+
+= 0.5.1.1 =
+* Chinese Simplified translation by Sparanoid.
+
+= 0.5.1 =
+* Toolbar tweaks for WordPress 3.3.
+
+= 0.5 =
+* New "Switch off" function: Log out and log instantly back in again when needed (see the FAQ).
+
+= 0.4.1 =
+* Support for upcoming changes to the admin bar in WordPress 3.3.
+
+= 0.4 =
+* Add some extended support for BuddyPress.
+* Add some extended support for Multisite.
+* Fix a permissions problem for users with no privileges.
+* Fix a PHP warning when used as a mu-plugin (thanks Scribu).
+
+= 0.3.2 =
+* Fix the 'Switch back to' menu item in the WordPress admin bar (WordPress 3.1+).
+* Fix a formatting issue on the user profile page.
+
+= 0.3.1 =
+* Prevent admins switching to multisite super admin accounts.
+
+= 0.3 =
+* Adds an admin bar menu item (WordPress 3.1+) for switching back to the user you switched from.
+
+= 0.2.2 =
+* Respect the current 'Remember me' setting when switching users.
+* Redirect to home page instead of admin screen if the user you're switching to has no privileges.
+
+= 0.2.1 =
+* Edge case bugfix to prevent 'Switch back to...' message appearing when it shouldn't.
+
+= 0.2 =
+* Functionality for switching back to user you switched from.
+
+= 0.1 =
+* Initial release.
+
+== Upgrade Notice ==
+
+= 0.5.1.3 =
+* Farsi (Persian) translation by Amin Ab, and Network Admin and BuddyPress bugfixes.
+
+= 0.5.1.2 =
+* German translation by Ralph Stenzel.
+
+= 0.5.1.1 =
+* Chinese Simplified translation by Sparanoid.
+
+= 0.5.1 =
+* Toolbar tweaks for WordPress 3.3.
+
+= 0.5 =
+* Introduces the "Switch off" function: Log out and log instantly back in again when needed (see the FAQ).
+
+= 0.4.1 =
+* Support for upcoming changes to the admin bar in WordPress 3.3.
+
+= 0.4 =
+User switching links on Network Admin screens and BuddyPress user screens.
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diff --git a/user-switching.php b/user-switching.php
new file mode 100644
index 0000000..8f85d10
--- /dev/null
+++ b/user-switching.php
@@ -0,0 +1,510 @@
+<?php
+/*
+Plugin Name:  User Switching
+Description:  Instant switching between user accounts in WordPress
+Version:      0.5.2
+Plugin URI:   http://lud.icro.us/wordpress-plugin-user-switching/
+Author:       John Blackbourn
+Author URI:   http://johnblackbourn.com/
+Text Domain:  user_switching
+Domain Path:  /languages/
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+*/
+
+class user_switching {
+
+	/**
+	 * Class constructor. Set up some filters and actions.
+	 *
+	 * @return null
+	 */
+	function __construct() {
+
+		# Required functionality:
+		add_filter( 'user_has_cap',             array( $this, 'user_cap_filter' ), 10, 3 );
+		add_filter( 'map_meta_cap',             array( $this, 'map_meta_cap' ), 10, 4 );
+		add_filter( 'user_row_actions',         array( $this, 'user_row' ), 10, 2 );
+		add_action( 'plugins_loaded',           array( $this, 'set_old_cookie' ) );
+		add_action( 'init',                     array( $this, 'init' ) );
+		add_action( 'admin_notices',            array( $this, 'admin_notice' ), 1 );
+		add_action( 'wp_logout',                'wp_clear_olduser_cookie' );
+		add_action( 'wp_login',                 'wp_clear_olduser_cookie' );
+
+		# Nice-to-haves:
+		add_filter( 'ms_user_row_actions',      array( $this, 'user_row' ), 10, 2 );
+		add_action( 'wp_footer',                array( $this, 'switch_on' ) );
+		add_action( 'personal_options',         array( $this, 'personal_options' ) );
+		add_action( 'admin_bar_menu',           array( $this, 'admin_bar_menu' ), 11 );
+		add_action( 'bp_adminbar_menus',        array( $this, 'bp_menu' ), 9 );
+		add_action( 'bp_member_header_actions', array( $this, 'bp_button' ), 11 );
+		add_action( 'network_admin_notices',    array( $this, 'admin_notice' ), 1 );
+		add_action( 'login_message',            array( $this, 'login_message' ), 1 );
+
+	}
+
+	/**
+	 * Define the name of the old user cookie. Uses WordPress' cookie hash for increased security.
+	 *
+	 * @return null
+	 */
+	function set_old_cookie() {
+		if ( !defined( 'OLDUSER_COOKIE' ) )
+			define( 'OLDUSER_COOKIE', 'wordpress_olduser_' . COOKIEHASH );
+	}
+
+	/**
+	 * Output the 'Switch To' link on the user editing screen if we have permission to switch to this user.
+	 *
+	 * @param object $user User object for this screen
+	 * @return null
+	 */
+	function personal_options( $user ) {
+		if ( !current_user_can( 'switch_to_user', $user->ID ) )
+			return;
+		?>
+		<tr>
+			<th scope="row"><?php _ex( 'User Switching', 'User Switching title on user profile screen', 'user_switching' ); ?></th>
+			<td><a href="<?php echo $this->switch_to_url( $user->ID ); ?>"><?php _e( 'Switch&nbsp;To', 'user_switching' ); ?></a></td>
+		</tr>
+		<?php
+	}
+
+	/**
+	 * Return whether or not the current logged in user is being remembered in the form of a persistent browser
+	 * cookie (ie. they checked the 'Remember Me' check box when they logged in). This is used to persist the
+	 * 'remember me' value when the user switches to another user.
+	 *
+	 * @return bool Whether the current user is being 'remembered' or not.
+	 */
+	function remember() {
+
+		$current_user = wp_get_current_user();
+		$current      = wp_parse_auth_cookie( '', 'logged_in' );
+		$cookie_life  = apply_filters( 'auth_cookie_expiration', 172800, $current_user->ID, false );
+
+		return ( ( $current['expiration'] - time() ) > $cookie_life );
+
+	}
+
+	/**
+	 * Load localisation files and route actions depending on the 'action' query var. Actions are secured
+	 * with WordPress' nonce system.
+	 *
+	 * @return null
+	 */
+	function init() {
+
+		load_plugin_textdomain( 'user_switching', false, dirname( plugin_basename( __FILE__ ) ) . '/languages' );
+
+		if ( !isset( $_REQUEST['action'] ) )
+			return;
+
+		switch ( $_REQUEST['action'] ) {
+
+			# We're attempting to switch to another user:
+			case 'switch_to_user':
+				$user_id = intval( $_REQUEST['user_id'] );
+
+				check_admin_referer( "switch_to_user_{$user_id}" );
+
+				# Switch user:
+				if ( switch_to_user( $user_id, $this->remember() ) ) {
+
+					# Redirect to the dashboard or the home URL depending on capabilities:
+					if ( !current_user_can( 'read' ) )
+						wp_redirect( add_query_arg( array( 'user_switched' => 'true' ), home_url() ) );
+					else
+						wp_redirect( add_query_arg( array( 'user_switched' => 'true' ), admin_url() ) );
+					die();
+
+				} else {
+					wp_die( __( 'Could not switch users.', 'user_switching' ) );
+				}
+				break;
+
+			# We're attempting to switch back to the originating user:
+			case 'switch_to_olduser':
+
+				check_admin_referer( 'switch_to_olduser' );
+
+				# Fetch the originating user data:
+				if ( !$old_user = $this->get_old_user() )
+					wp_die( __( 'Could not switch users.', 'user_switching' ) );
+
+				# Switch user:
+				if ( switch_to_user( $old_user->ID, $this->remember(), false ) ) {
+					wp_redirect( add_query_arg( array( 'user_switched' => 'true', 'back' => 'true' ), admin_url('users.php') ) );
+					die();
+				} else {
+					wp_die( __( 'Could not switch users.', 'user_switching' ) );
+				}
+				break;
+
+			# We're attempting to switch off the current user:
+			case 'switch_off':
+
+				check_admin_referer( 'switch_off' );
+
+				# Switch off:
+				if ( switch_off_user() ) {
+					wp_redirect( add_query_arg( array( 'switched_off' => 'true' ), home_url() ) );
+					die();
+				} else {
+					wp_die( __( 'Could not switch off.', 'user_switching' ) );
+				}
+				break;
+
+		}
+
+	}
+
+	/**
+	 * Display the 'Switched to {user}' and 'Switch back to {user}' messages in the admin area.
+	 *
+	 * @return null
+	 */
+	function admin_notice() {
+		global $user_identity, $user_login;
+
+		if ( $old_user = $this->get_old_user() ) {
+
+			?>
+			<div id="user_switching" class="updated">
+				<p><?php
+					if ( isset( $_GET['user_switched'] ) )
+						printf( __( 'Switched to %1$s (%2$s).', 'user_switching' ), $user_identity, $user_login );
+					printf( ' <a href="%s">%s</a>.', $this->switch_back_url(), sprintf( __( 'Switch back to %1$s (%2$s)', 'user_switching' ), $old_user->display_name, $old_user->user_login ) );
+				?></p>
+			</div>
+			<?php
+
+		} else if ( isset( $_GET['user_switched'] ) ) {
+
+			?>
+			<div id="user_switching" class="updated">
+				<p><?php
+					if ( isset( $_GET['back'] ) )
+						printf( __( 'Switched back to %1$s (%2$s).', 'user_switching' ), $user_identity, $user_login );
+					else
+						printf( __( 'Switched to %1$s (%2$s).', 'user_switching' ), $user_identity, $user_login );
+				?></p>
+			</div>
+			<?php
+
+		}
+	}
+
+	/**
+	 * Validate the old_user cookie and return its user data.
+	 *
+	 * @return bool|object False if there's no old_user cookie or it's invalid, WP_User object if it's present and valid.
+	 */
+	function get_old_user() {
+		if ( isset( $_COOKIE[OLDUSER_COOKIE] ) ) {
+			if ( $old_user_id = wp_validate_auth_cookie( $_COOKIE[OLDUSER_COOKIE], 'old_user' ) )
+				return get_userdata( $old_user_id );
+		}
+		return false;
+	}
+
+	/**
+	 * Adds a 'Switch back to {user}' link to the account menu in WordPress' admin bar.
+	 *
+	 * @return null
+	 */
+	function admin_bar_menu( $wp_admin_bar ) {
+
+		if ( !function_exists( 'is_admin_bar_showing' ) )
+			return;
+		if ( !is_admin_bar_showing() )
+			return;
+
+		if ( method_exists( $wp_admin_bar, 'get_node' ) and $wp_admin_bar->get_node( 'user-actions' ) )
+			$parent = 'user-actions';
+		else if ( get_option( 'show_avatars' ) )
+			$parent = 'my-account-with-avatar';
+		else
+			$parent = 'my-account';
+
+		if ( $old_user = $this->get_old_user() ) {
+
+			$wp_admin_bar->add_menu( array(
+				'parent' => $parent,
+				'id'     => 'wp-admin-bar-switch-back',
+				'title'  => sprintf( __( 'Switch back to %1$s (%2$s)', 'user_switching' ), $old_user->display_name, $old_user->user_login ),
+				'href'   => $this->switch_back_url()
+			) );
+
+		}
+
+		if ( current_user_can( 'switch_off' ) ) {
+
+			$wp_admin_bar->add_menu( array(
+				'parent' => $parent,
+				'id'     => 'wp-admin-bar-switch-off',
+				'title'  => __( 'Switch Off', 'user_switching' ),
+				'href'   => $this->switch_off_url()
+			) );
+
+		}
+
+	}
+
+	/**
+	 * Adds a 'Switch back to {user}' link to the WordPress footer if a user is switched off.
+	 *
+	 * @return null
+	 */
+	function switch_on() {
+
+		if ( !is_user_logged_in() and $old_user = $this->get_old_user() ) {
+			$link = sprintf( __( 'Switch back to %1$s (%2$s)', 'user_switching' ), $old_user->display_name, $old_user->user_login );
+			echo '<p id="user_switching_switch_on"><a href="' . $this->switch_back_url() . '">' . $link . '</a></p>';
+		}
+
+	}
+
+	/**
+	 * Adds a 'Switch back to {user}' link to the WordPress login screen if a user is switched off.
+	 *
+	 * @return null
+	 */
+	function login_message( $message ) {
+
+		if ( !is_user_logged_in() and $old_user = $this->get_old_user() ) {
+			$link = sprintf( __( 'Switch back to %1$s (%2$s)', 'user_switching' ), $old_user->display_name, $old_user->user_login );
+			$message .= '<p class="message"><a href="' . $this->switch_back_url() . '">' . $link . '</a></p>';
+		}
+
+		return $message;
+
+	}
+
+	/**
+	 * Adds a 'Switch To' link to each list of user actions on the Users screen.
+	 *
+	 * @return null
+	 */
+	function user_row( $actions, $user ) {
+		if ( current_user_can( 'switch_to_user', $user->ID ) )
+			$actions[] = '<a href="' . $this->switch_to_url( $user->ID ) . '">' . __( 'Switch&nbsp;To', 'user_switching' ) . '</a>';
+		return $actions;
+	}
+
+	/**
+	 * Adds a 'Switch back to {user}' link to the BuddyPress admin bar.
+	 *
+	 * @return null
+	 */
+	function bp_menu() {
+
+		if ( !is_admin() and $old_user = $this->get_old_user() ) {
+
+			echo '<li id="bp-adminbar-userswitching-menu" style="background-image:none"><a href="' . $this->switch_back_url() . '">';
+			printf( __( 'Switch back to %1$s (%2$s)', 'user_switching' ), $old_user->display_name, $old_user->user_login );
+			echo '</a></li>';
+
+		}
+
+	}
+
+	/**
+	 * Adds a 'Switch To' link to each member's profile page in BuddyPress.
+	 *
+	 * @return null
+	 */
+	function bp_button() {
+
+		global $bp, $members_template;
+
+		if ( !empty( $members_template ) )
+			$id = intval( $members_template->member->id );
+		else
+			$id = intval( $bp->displayed_user->id );
+
+		if ( current_user_can( 'switch_to_user', $id ) ) {
+			echo bp_get_button( array(
+				'id'         => 'user_switching',
+				'component'  => 'members', # https://buddypress.trac.wordpress.org/ticket/4212
+				'link_href'  => $this->switch_to_url( $id ),
+				'link_text'  => __( 'Switch&nbsp;To', 'user_switching' )
+			) );
+		}
+
+	}
+
+	/**
+	 * Returns the nonce-secured URL needed to switch to a given user ID.
+	 *
+	 * @param int $user_id The user ID to be switched to.
+	 * @return string The required URL
+	 */
+	function switch_to_url( $user_id ) {
+		return wp_nonce_url( add_query_arg( array(
+			'action'  => 'switch_to_user',
+			'user_id' => $user_id
+		), site_url( 'wp-login.php', 'login' ) ), "switch_to_user_{$user_id}" );
+	}
+
+	/**
+	 * Returns the nonce-secured URL needed to switch back to the originating user.
+	 *
+	 * @return string The required URL
+	 */
+	function switch_back_url() {
+		return wp_nonce_url( add_query_arg( array(
+			'action' => 'switch_to_olduser'
+		), site_url( 'wp-login.php', 'login' ) ), 'switch_to_olduser' );
+	}
+
+	/**
+	 * Returns the nonce-secured URL needed to "switch off" the current user.
+	 *
+	 * @return string The required URL
+	 */
+	function switch_off_url() {
+		return wp_nonce_url( add_query_arg( array(
+			'action'  => 'switch_off'
+		), site_url( 'wp-login.php', 'login' ) ), 'switch_off' );
+	}
+
+	/**
+	 * Filter the user's capabilities so they can be added/removed on the fly.
+	 *
+	 * This is used to grant the 'switch_to_user' capability to a user if they have the ability to edit the user
+	 * they're trying to switch to (and that user is not themselves), and to grant the 'switch_off' capability to
+	 * a user if they can edit users.
+	 *
+	 * Important: This does not get called for Super Admins. See map_meta_cap() below.
+	 *
+	 * @param array $user_caps User's capabilities
+	 * @param array $required_caps Actual required capabilities for the requested capability
+	 * @param array $args Arguments that accompany the requested capability check:
+	 *                    [0] => Requested capability from current_user_can()
+	 *                    [1] => Current user ID
+	 *                    [2] => Optional second parameter from current_user_can()
+	 * @return array User's capabilities
+	 */
+	function user_cap_filter( $user_caps, $required_caps, $args ) {
+		if ( 'switch_to_user' == $args[0] )
+			$user_caps['switch_to_user'] = ( current_user_can( 'edit_user', $args[2] ) and ( $args[2] != $args[1] ) );
+		else if ( 'switch_off' == $args[0] )
+			$user_caps['switch_off'] = ( current_user_can( 'edit_users' ) and !$this->get_old_user() );
+		return $user_caps;
+	}
+
+	/**
+	 * Filters the actual required capabilities for a given capability or meta capability.
+	 *
+	 * This is used to add the 'do_not_allow' capability to the list of required capabilities when a super admin
+	 * is trying to switch to themselves. It affects nothing else as super admins can do everything by default.
+	 *
+	 * @param array $required_caps Actual required capabilities for the requested action
+	 * @param string $cap Capability or meta capability being checked
+	 * @param string $user_id Current user ID
+	 * @param array $args Arguments that accompany this capability check
+	 * @return array Required capabilities for the requested action
+	 */
+	function map_meta_cap( $required_caps, $cap, $user_id, $args ) {
+		if ( ( 'switch_to_user' == $cap ) and ( $args[0] == $user_id ) )
+			$required_caps[] = 'do_not_allow';
+		else if ( ( 'switch_off' == $cap ) and ( $this->get_old_user() ) )
+			$required_caps[] = 'do_not_allow';
+		return $required_caps;
+	}
+
+}
+
+/**
+ * Sets an authorisation cookie containing the user ID of the originating user.
+ *
+ * @param int $old_user_id The ID of the originating user, usually the current logged in user.
+ * @return null
+ */
+if ( !function_exists( 'wp_set_olduser_cookie' ) ) {
+function wp_set_olduser_cookie( $old_user_id ) {
+	$expiration = time() + 172800; # 48 hours
+	$cookie = wp_generate_auth_cookie( $old_user_id, $expiration, 'old_user' );
+	setcookie( OLDUSER_COOKIE, $cookie, $expiration, COOKIEPATH, COOKIE_DOMAIN, false );
+}
+}
+
+/**
+ * Clears the cookie containing the originating user ID.
+ *
+ * @return null
+ */
+if ( !function_exists( 'wp_clear_olduser_cookie' ) ) {
+function wp_clear_olduser_cookie() {
+	setcookie( OLDUSER_COOKIE, ' ', time() - 31536000, COOKIEPATH, COOKIE_DOMAIN );
+}
+}
+
+/**
+ * Switches the current logged in user to the specified user.
+ *
+ * @param int $user_id The ID of the user to switch to.
+ * @param bool $remember Whether to 'remember' the user in the form of a persistent browser cookie. Optional.
+ * @param int|bool $old_user_id The ID of the originating user, or false to not set the old user cookie. Defaults to the current user.
+ * @return bool True on success, false on failure.
+ */
+if ( !function_exists( 'switch_to_user' ) ) {
+function switch_to_user( $user_id, $remember = false, $old_user_id = 0 ) {
+	if ( !function_exists( 'wp_set_auth_cookie' ) )
+		return false;
+	if ( !$user_id )
+		return false;
+	if ( !$user = get_userdata( $user_id ) )
+		return false;
+
+	if ( 0 === $old_user_id ) {
+		if ( $current_user = wp_get_current_user() )
+			$old_user_id = $current_user->ID;
+	}
+
+	if ( $old_user_id )
+		wp_set_olduser_cookie( $old_user_id );
+	else
+		wp_clear_olduser_cookie();
+
+	wp_clear_auth_cookie();
+	wp_set_auth_cookie( $user_id, $remember );
+	wp_set_current_user( $user_id );
+
+	return true;
+}
+}
+
+/**
+ * Switches off the current logged in user. This logs the current user out while retaining a cookie allowing them to log straight
+ * back in using the 'Switch back to {user}' system.
+ *
+ * @return bool True on success, false on failure.
+ */
+if ( !function_exists( 'switch_off_user' ) ) {
+function switch_off_user() {
+	if ( $current_user = wp_get_current_user() )
+		$old_user_id = $current_user->ID;
+	else
+		return false;
+
+	wp_set_olduser_cookie( $old_user_id );
+	wp_clear_auth_cookie();
+
+	return true;
+}
+}
+
+$user_switching = new user_switching;
+
+?>
\ No newline at end of file