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<?php
/*
Plugin Name: User Switching
Description: Instant switching between user accounts in WordPress
Version: 0.8.8
Plugin URI: https://johnblackbourn.com/wordpress-plugin-user-switching/
Author: John Blackbourn
Author URI: https://johnblackbourn.com/
Text Domain: user-switching
Domain Path: /languages/
License: GPL v2 or later
Network: true
Copyright © 2014 John Blackbourn
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.
*/
public function __construct() {
# Required functionality:
add_filter( 'user_has_cap', array( $this, 'filter_user_has_cap' ), 10, 3 );
add_filter( 'map_meta_cap', array( $this, 'filter_map_meta_cap' ), 10, 4 );
add_filter( 'user_row_actions', array( $this, 'filter_user_row_actions' ), 10, 2 );
add_action( 'plugins_loaded', array( $this, 'action_plugins_loaded' ) );
add_action( 'init', array( $this, 'action_init' ) );
add_action( 'all_admin_notices', array( $this, 'action_admin_notices' ), 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, 'filter_user_row_actions' ), 10, 2 );
add_filter( 'login_message', array( $this, 'filter_login_message' ), 1 );
add_action( 'wp_footer', array( $this, 'action_wp_footer' ) );
add_action( 'personal_options', array( $this, 'action_personal_options' ) );
add_action( 'admin_bar_menu', array( $this, 'action_admin_bar_menu' ), 11 );
add_action( 'bp_member_header_actions', array( $this, 'action_bp_button' ), 11 );
add_action( 'bp_directory_members_actions', array( $this, 'action_bp_button' ), 11 );
add_action( 'bbp_template_after_user_details', array( $this, 'action_bbpress_button' ) );
}
/**
* Define the name of the old user cookie. Uses WordPress' cookie hash for increased security.
*
* @return null
*/
public function action_plugins_loaded() {
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 WP_User $user User object for this screen
* @return null
*/
public function action_personal_options( WP_User $user ) {
if ( ! $link = self::maybe_switch_url( $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 $link; ?>"><?php _e( 'Switch 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.
*/
public static function remember() {
$current = wp_parse_auth_cookie( '', 'logged_in' );
$cookie_life = apply_filters( 'auth_cookie_expiration', 172800, get_current_user_id(), false );
# Here we calculate the expiration length of the current auth cookie and compare it to the default expiration.
# If it's greater than this, then we know the user checked 'Remember Me' when they logged in.
return ( ( $current['expiration'] - time() ) > $cookie_life );
}
/**
* Load localisation files and route actions depending on the 'action' query var.
*
* @return null
*/
public function action_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 = absint( $_REQUEST['user_id'] );
check_admin_referer( "switch_to_user_{$user_id}" );
# Switch user:
$user = switch_to_user( $user_id, self::remember() );
if ( $user ) {
$redirect_to = self::get_redirect( $user );
# Redirect to the dashboard or the home URL depending on capabilities:
if ( $redirect_to ) {
wp_safe_redirect( add_query_arg( array( 'user_switched' => 'true' ), $redirect_to ) );
} else if ( !current_user_can( 'read' ) ) {
wp_redirect( add_query_arg( array( 'user_switched' => 'true' ), home_url() ) );
} else {
wp_redirect( add_query_arg( array( 'user_switched' => 'true' ), admin_url() ) );
}
die();
} else {
wp_die( __( 'Could not switch users.', 'user-switching' ) );
}
break;
# We're attempting to switch back to the originating user:
case 'switch_to_olduser':
check_admin_referer( 'switch_to_olduser' );
# Fetch the originating user data:
if ( !$old_user = self::get_old_user() ) {
wp_die( __( 'Could not switch users.', 'user-switching' ) );
}
# Switch user:
if ( switch_to_user( $old_user->ID, self::remember(), false ) ) {
$redirect_to = self::get_redirect();
if ( $redirect_to ) {
wp_safe_redirect( add_query_arg( array( 'user_switched' => 'true', 'switched_back' => 'true' ), $redirect_to ) );
} else {
wp_redirect( add_query_arg( array( 'user_switched' => 'true', 'switched_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() ) {
$redirect_to = self::get_redirect();
if ( $redirect_to ) {
wp_safe_redirect( add_query_arg( array( 'switched_off' => 'true' ), $redirect_to ) );
} else {
wp_redirect( add_query_arg( array( 'switched_off' => 'true' ), home_url() ) );
}
die();
} else {
wp_die( __( 'Could not switch off.', 'user-switching' ) );
}
break;
}
}
/**
* Fetch the URL to redirect to for a given user (used after switching).
*
* @param WP_User|null A WP_User object (optional).
* @return string The URL to redirect to.
*/
protected static function get_redirect( WP_User $user = null ) {
if ( isset( $_REQUEST['redirect_to'] ) and !empty( $_REQUEST['redirect_to'] ) ) {
$redirect_to = self::remove_query_args( $_REQUEST['redirect_to'] );
} else {
$redirect_to = '';
}
if ( $user ) {
$redirect_to = apply_filters( 'login_redirect', $redirect_to, $redirect_to, $user );
}
return $redirect_to;
}
/**
* Display the 'Switched to {user}' and 'Switch back to {user}' messages in the admin area.
*
* @return null
*/
public function action_admin_notices() {
$user = wp_get_current_user();
if ( $old_user = self::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->display_name, $user->user_login );
}
$url = add_query_arg( array(
'redirect_to' => urlencode( self::current_url() )
), self::switch_back_url() );
printf( ' <a href="%s">%s</a>.', $url, sprintf( __( 'Switch back to %1$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( $_GET['switched_back'] ) ) {
printf( __( 'Switched back to %1$s (%2$s).', 'user-switching' ), $user->display_name, $user->user_login );
} else {
printf( __( 'Switched to %1$s (%2$s).', 'user-switching' ), $user->display_name, $user->user_login );
}
?></p>
</div>
<?php
}
}
/**
* Validate the latest item in the old_user cookie and return its user data.
*
* @return bool|WP_User False if there's no old user cookie or it's invalid, WP_User object if it's present and valid.
*/
public static function get_old_user() {
$cookie = wp_get_olduser_cookie();
if ( !empty( $cookie ) ) {
if ( $old_user_id = wp_validate_auth_cookie( end( $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.
*
* @param WP_Admin_Bar $wp_admin_bar The admin bar object
* @return null
*/
public function action_admin_bar_menu( WP_Admin_Bar $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 = self::get_old_user() ) {
$wp_admin_bar->add_menu( array(
'parent' => $parent,
'id' => 'switch-back',
'title' => sprintf( __( 'Switch back to %1$s (%2$s)', 'user-switching' ), $old_user->display_name, $old_user->user_login ),
'href' => add_query_arg( array(
'redirect_to' => urlencode( self::current_url() )
), self::switch_back_url() )
) );
}
if ( current_user_can( 'switch_off' ) ) {
$url = self::switch_off_url();
if ( !is_admin() ) {
$url = add_query_arg( array(
'redirect_to' => urlencode( self::current_url() )
), $url );
}
$wp_admin_bar->add_menu( array(
'parent' => $parent,
'id' => 'switch-off',
'title' => __( 'Switch Off', 'user-switching' ),
'href' => $url
) );
}
}
/**
* Adds a 'Switch back to {user}' link to the WordPress footer if the admin toolbar isn't showing.
*
* @return null
*/
public function action_wp_footer() {
if ( !is_admin_bar_showing() and $old_user = self::get_old_user() ) {
$link = sprintf( __( 'Switch back to %1$s (%2$s)', 'user-switching' ), $old_user->display_name, $old_user->user_login );
$url = add_query_arg( array(
'redirect_to' => urlencode( self::current_url() )
), self::switch_back_url() );
echo '<p id="user_switching_switch_on"><a href="' . $url . '">' . $link . '</a></p>';
}
}
/**
* Adds a 'Switch back to {user}' link to the WordPress login screen.
*
* @param string $message The login screen message
* @return string The login screen message
*/
public function filter_login_message( $message ) {
if ( $old_user = self::get_old_user() ) {
$link = sprintf( __( 'Switch back to %1$s (%2$s)', 'user-switching' ), $old_user->display_name, $old_user->user_login );
$url = self::switch_back_url();
if ( isset( $_REQUEST['redirect_to'] ) and !empty( $_REQUEST['redirect_to'] ) ) {
$url = add_query_arg( array(
'redirect_to' => urlencode( $_REQUEST['redirect_to'] )
), $url );
}
$message .= '<p class="message"><a href="' . $url . '">' . $link . '</a></p>';
}
return $message;
}
/**
* Adds a 'Switch To' link to each list of user actions on the Users screen.
*
* @param array $actions The actions to display for this user row
* @param WP_User $user The user object displayed in this row
* @return array The actions to display for this user row
*/
public function filter_user_row_actions( array $actions, WP_User $user ) {
if ( ! $link = self::maybe_switch_url( $user->ID ) ) {
return $actions;
}
$actions['switch_to_user'] = '<a href="' . $link . '">' . __( 'Switch To', 'user-switching' ) . '</a>';
return $actions;
}
/**
* Adds a 'Switch To' link to each member's profile page and profile listings in BuddyPress.
*
* @return null
*/
public function action_bp_button() {
global $bp, $members_template;
if ( !empty( $members_template ) and empty( $bp->displayed_user->id ) ) {
$id = absint( $members_template->member->id );
} else {
$id = absint( $bp->displayed_user->id );
}
if ( ! $link = self::maybe_switch_url( $id ) ) {
return;
}
$link = add_query_arg( array(
'redirect_to' => urlencode( bp_core_get_user_domain( $id ) )
), $link );
# Workaround for https://buddypress.trac.wordpress.org/ticket/4212
$components = array_keys( $bp->active_components );
if ( !empty( $components ) ) {
$component = reset( $components );
} else {
$component = 'core';
}
echo bp_get_button( array(
'id' => 'user_switching',
'component' => $component,
'link_href' => $link,
'link_text' => __( 'Switch To', 'user-switching' )
) );
}
/**
* Adds a 'Switch To' link to each member's profile page in bbPress.
*
* @return null
*/
public function action_bbpress_button() {
$id = bbp_get_user_id();
if ( ! $link = self::maybe_switch_url( $id ) ) {
return;
}
$link = add_query_arg( array(
'redirect_to' => urlencode( bbp_get_user_profile_url( $id ) )
), $link );
?>
<ul>
<li><a href="<?php echo $link; ?>"><?php _e( 'Switch To', 'user-switching' ); ?></a></li>
</ul>
<?php
}
/**
* Helper function. Returns the switch to or switch back URL for a given user ID.
*
* @param int $user_id The user ID to be switched to.
* @return string|bool The required URL, or false if there's no old user or the user doesn't have the required capability.
*/
public static function maybe_switch_url( $user_id ) {
$old_user = self::get_old_user();
if ( $old_user and ( $old_user->ID == $user_id ) ) {
return self::switch_back_url();
} else if ( current_user_can( 'switch_to_user', $user_id ) ) {
return self::switch_to_url( $user_id );
} else {
return false;
}
}
/**
* Helper function. 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
*/
public static function switch_to_url( $user_id ) {
return wp_nonce_url( add_query_arg( array(
'action' => 'switch_to_user',
'user_id' => $user_id
), wp_login_url() ), "switch_to_user_{$user_id}" );
}
/**
* Helper function. Returns the nonce-secured URL needed to switch back to the originating user.
*
* @return string The required URL
*/
public static function switch_back_url() {
return wp_nonce_url( add_query_arg( array(
'action' => 'switch_to_olduser'
), wp_login_url() ), 'switch_to_olduser' );
}
/**
* Helper function. Returns the nonce-secured URL needed to switch off the current user.
*
* @return string The required URL
*/
public static function switch_off_url() {
return wp_nonce_url( add_query_arg( array(
'action' => 'switch_off'
), wp_login_url() ), 'switch_off' );
}
/**
* Helper function. Returns the current URL.
*
* @return string The current URL
*/
public static function current_url() {
return ( is_ssl() ? 'https://' : 'http://' ) . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
}
/**
* Helper function. Removes a list of common confirmation-style query args from a URL.
*
* @param string $url A URL
* @return string The URL with the listed query args removed
*/
public static function remove_query_args( $url ) {
return remove_query_arg( array(
'user_switched', 'switched_off', 'switched_back',
'message', 'updated', 'settings-updated', 'saved',
'activated', 'activate', 'deactivate',
'locked', 'skipped', 'deleted', 'trashed', 'untrashed'
), $url );
}
/**
* 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 filter_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
*/
public function filter_user_has_cap( array $user_caps, array $required_caps, array $args ) {
if ( 'switch_to_user' == $args[0] ) {
$user_caps['switch_to_user'] = ( user_can( $args[1], 'edit_user', $args[2] ) and ( $args[2] != $args[1] ) );
} else if ( 'switch_off' == $args[0] ) {
$user_caps['switch_off'] = user_can( $args[1], 'edit_users' );
}
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
*/
public function filter_map_meta_cap( array $required_caps, $cap, $user_id, array $args ) {
if ( ( 'switch_to_user' == $cap ) and ( $args[0] == $user_id ) ) {
$required_caps[] = 'do_not_allow';
}
return $required_caps;
}
}
/**
* Sets an authorisation cookie containing the originating user, or appends it if there's more than one.
*
* @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_get_olduser_cookie();
$cookie[] = wp_generate_auth_cookie( $old_user_id, $expiration, 'old_user' );
$secure = apply_filters( 'secure_logged_in_cookie', false, $old_user_id, is_ssl() );
setcookie( OLDUSER_COOKIE, json_encode( $cookie ), $expiration, COOKIEPATH, COOKIE_DOMAIN, $secure, true );
}
}
/**
* Clears the cookie containing the originating user, or pops the latest item off the end if there's more than one.
*
* @param bool $clear_all Whether to clear the cookie or just pop the last user information off the end.
* @return null
*/
if ( !function_exists( 'wp_clear_olduser_cookie' ) ) {
function wp_clear_olduser_cookie( $clear_all = true ) {
$cookie = wp_get_olduser_cookie();
if ( $clear_all or empty( $cookie ) ) {
setcookie( OLDUSER_COOKIE, ' ', time() - 31536000, COOKIEPATH, COOKIE_DOMAIN );
} else {
array_pop( $cookie );
$expiration = time() + 172800; # 48 hours
$secure = apply_filters( 'secure_logged_in_cookie', false, get_current_user_id(), is_ssl() );
setcookie( OLDUSER_COOKIE, json_encode( $cookie ), $expiration, COOKIEPATH, COOKIE_DOMAIN, $secure, true );
}
}
}
/**
* Gets the value of the cookie containing the list of originating users.
*
* @return array Array of originating user authentication cookies. @see wp_generate_auth_cookie()
*/
if ( !function_exists( 'wp_get_olduser_cookie' ) ) {
function wp_get_olduser_cookie() {
if ( isset( $_COOKIE[OLDUSER_COOKIE] ) ) {
$cookie = json_decode( stripslashes( $_COOKIE[OLDUSER_COOKIE] ) );
}
if ( !isset( $cookie ) or !is_array( $cookie ) ) {
$cookie = array();
}
return $cookie;
}
}
/**
* 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 bool $set_old_user Whether to set the old user cookie. Optional.
* @return bool|WP_User WP_User object on success, false on failure.
*/
if ( !function_exists( 'switch_to_user' ) ) {
function switch_to_user( $user_id, $remember = false, $set_old_user = true ) {
if ( !$user = get_userdata( $user_id ) ) {
return false;
}
if ( $set_old_user and is_user_logged_in() ) {
$old_user_id = get_current_user_id();
wp_set_olduser_cookie( $old_user_id );
} else {
$old_user_id = false;
wp_clear_olduser_cookie( false );
}
wp_clear_auth_cookie();
wp_set_auth_cookie( $user_id, $remember );
wp_set_current_user( $user_id );
if ( $set_old_user ) {
do_action( 'switch_to_user', $user_id, $old_user_id );
} else {
do_action( 'switch_back_user', $user_id, $old_user_id );
}
return $user;
}
}
/**
* Switches off the current logged in user. This logs the current user out while retaining a cookie allowing them to log straight
* back in using the 'Switch back to {user}' system.
*
* @return bool True on success, false on failure.
*/
if ( !function_exists( 'switch_off_user' ) ) {
function switch_off_user() {
if ( !$old_user_id = get_current_user_id() ) {
return false;
}
wp_set_olduser_cookie( $old_user_id );
wp_clear_auth_cookie();
do_action( 'switch_off_user', $old_user_id );
return true;
}
}
/**
* Helper function. Did the current user switch into their account?
*
* @return bool|object False if the user isn't logged in or they didn't switch in; old user object (which evalutes to true) if the user switched into the current user account.
*/
if ( !function_exists( 'current_user_switched' ) ) {
function current_user_switched() {
if ( !is_user_logged_in() ) {
return false;
}
return user_switching::get_old_user();
}
}
global $user_switching;
$user_switching = new user_switching;