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level.php
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<?php
/**
* @package Restrict User Access
* @author Joachim Jensen <[email protected]>
* @license GPLv3
* @copyright 2017 by Joachim Jensen
*/
if (!defined('ABSPATH')) {
exit;
}
final class RUA_Level_Manager {
/**
* Metadata
*
* @var WPCAObjectManager
*/
private $metadata;
/**
* Access Levels
*
* @var array
*/
private $levels = array();
/**
* User level capabilities
* @var array
*/
private $user_levels_caps = array();
/**
* Constructor
*/
public function __construct() {
if(is_admin()) {
new RUA_Level_Overview();
new RUA_Level_Edit();
}
$this->add_actions();
$this->add_filters();
add_shortcode( 'restrict', array($this,'shortcode_restrict'));
}
/**
* Add callbacks to actions queue
*
* @since 0.5
*/
protected function add_actions() {
// if(!is_admin()) {
// add_action( 'pre_get_posts',
// array($this,'filter_nav_menus_query'));
// }
add_action('template_redirect',
array($this,'authorize_access'));
add_action('init',
array($this,'create_restrict_type'),99);
add_action( 'user_register',
array($this,'registered_add_level'));
add_action('wp_loaded',
array($this, 'init_protect_uploads'));
add_action( 'generate_rewrite_rules',
array($this, 'generate_rewrite_rules') );
}
/**
* Add callbacks to filters queue
*
* @since 0.5
*/
protected function add_filters() {
if(!is_admin()) {
add_filter( 'wp_get_nav_menu_items',
array($this,'filter_nav_menus'), 10, 3 );
}
//hook early, other plugins might add dynamic caps later
//fixes problem with WooCommerce Orders
add_filter( 'user_has_cap',
array($this,'user_level_has_cap'), 9, 4 );
// hook late to remove restricted posts from search results,
// even if added by other filters.
add_filter( 'posts_results',
array($this, 'filter_posts_results'), 10000, 2 );
}
/**
* Add rewrite rules for handling file access through WP.
*
* @since 0.17.2-mattys101
* @param WP_Rewrite $rewrite
* @return WP_Rewrite
*/
public function generate_rewrite_rules( $wp_rewrite ) {
$upload_url = wp_upload_dir();
$upload_url = $upload_url[ 'baseurl' ];
$regex = str_replace( site_url( '/' ), '', $upload_url );
$regex .= '/(.*)$';
$wp_rewrite->add_external_rule( $regex, 'index.php?file=$1' );
return $wp_rewrite;
}
/**
* Handle access to uploads and ensure users get access only if they
* have an appropriate level, or there are no restrictions on the file.
*
* @since 0.17.2-mattys101
*/
public function init_protect_uploads( ) {
if ( isset($_GET[ 'file' ]) ) {
$this->_authorize_file_access($_GET[ 'file' ]);
}
}
/**
* Filter navigation menu items by level
*
* @since 1.0
* @param array $items
* @param string $menu
* @param array $args
* @return array
*/
public function filter_nav_menus( $items, $menu, $args ) {
if(!$this->_has_global_access()) {
$user_levels = array_flip($this->get_user_levels());
foreach( $items as $key => $item ) {
$menu_levels = get_post_meta( $item->ID, '_menu_item_level', false );
if($menu_levels && !array_intersect_key($user_levels, array_flip($menu_levels))) {
unset($items[$key]);
}
}
}
return $items;
}
/**
* Filter navigation menu items by level
* using query
* Might have better performance
*
* @since 1.0
* @param WP_Query $query
* @return void
*/
public function filter_nav_menus_query( $query ) {
if (isset($query->query['post_type'],$query->query['include']) && $query->query['post_type'] == 'nav_menu_item' && $query->query['include']) {
$levels = $this->level_manager->get_user_levels();
$meta_query = array();
$meta_query[] = array(
'key' => '_menu_item_level',
'value' => 'wpbug',
'compare' => 'NOT EXISTS'
);
if($levels) {
$meta_query['relation'] = 'OR';
$meta_query[] = array(
'key' => '_menu_item_level',
'value' => $levels,
'compare' => 'IN'
);
}
$query->set('meta_query',$meta_query);
}
}
/**
* Get level by name
*
* @since 0.6
* @param string $name
* @return WP_Post|boolean
*/
public function get_level_by_name($name) {
$all_levels = RUA_App::instance()->get_levels();
$retval = false;
foreach ($all_levels as $id => $level) {
if($level->post_name == $name) {
if($level->post_status == RUA_App::STATUS_ACTIVE) {
$retval = $level;
}
break;
}
}
return $retval;
}
/**
* Restrict content in shortcode
*
* @version 0.1
* @param array $atts
* @param string $content
* @return string
*/
public function shortcode_restrict( $atts, $content = null ) {
$a = shortcode_atts( array(
'role' => '',
'level' => '',
'page' => 0
), $atts );
if(!$this->_has_global_access()) {
if($a['level']) {
$level = $this->get_level_by_name(ltrim($a['level'],'!'));
if($level) {
$not = $level->post_name != $a['level'];
$user_levels = array_flip($this->get_user_levels());
//when level is negated, hide content if user has it
//when level is not negated, hide content if user does not have it
if($not xor !isset($user_levels[$level->ID])) {
$content = '';
}
}
}
else if($a['role'] !== '') {
$roles = explode(',', $a['role']);
if(array_search('0', $roles)) {
_deprecated_argument( '[restrict]', '0.17', __('Use Access Level for logged-out users instead.','restrict-user-access'));
}
if(!array_intersect($roles, $this->get_user_roles())) {
$content = '';
}
}
// Only apply the page content if the user does not have access.
if($a['page'] && !$content) {
$page = get_post($a['page']);
if($page) {
setup_postdata($page);
$content = get_the_content();
wp_reset_postdata();
}
}
}
return do_shortcode($content);
}
/**
* Filters posts from the search results and archive pages if the current user cannot access them.
*
* @since 0.17.2.matty101
* @param array $posts
* @param WPQuery $query
* @return array
*/
public function filter_posts_results( $posts, $query ) {
if ( !($query->is_search() || $query->is_archive()) || $this->_has_global_access())
return $posts;
$result = array();
foreach ($posts as $post) {
// TODO: how to handle teased content in search results?
if ( !$this->_access_blocked($post) )
$result[] = $post;
}
return $result;
}
/**
* Check if a specific post can be accessed by the user.
* Returns the ID of the level that is blocking the user access if
* any exist. Therefore, if !_access_blocked(...) is true, then
* the user can access the content.
*
* NOTE: This is not particularly efficient in the backend; however,
* since search results, for example, are typically paged, we
* won't have to run this too many times in one go.
*
* @since 0.17.2.matty101
* @param WP_Post $post_to_check
* @return int
*/
private function _access_blocked( $post_to_check ) {
if (!$post_to_check) {
return 0;
}
if ($this->_has_global_access()) {
return 0;
}
if (is_numeric($post_to_check))
$post_to_check = get_post($post_to_check);
global $wp_query, $post;
$temp_query = new WP_Query(array('p' => $post_to_check->ID, 'post_type' => $post_to_check->post_type));
$posts = WPCACore::get_posts_in_context(RUA_App::TYPE_RESTRICT, $temp_query, $post_to_check);
$kick = 0;
if ($posts) {
$user_levels = array_flip($this->get_user_levels());
foreach ($posts as $post) {
if(!isset($user_levels[$post->ID])) {
$kick = $post->ID;
} else {
$kick = 0;
break;
}
}
if(!$kick && is_user_logged_in()) {
$conditions = WPCACore::get_conditions(RUA_App::TYPE_RESTRICT);
foreach ($conditions as $condition => $level) {
//Check post type
if(isset($posts[$level])) {
$drip = get_post_meta($condition,RUA_App::META_PREFIX.'opt_drip',true);
//Restrict access to dripped content
if($drip && $this->metadata()->get('role')->get_data($level) === '') {
$start = $this->get_user_level_start(null,$level);
$drip_time = strtotime('+'.$drip.' days 00:00',$start);
if(time() <= $drip_time) {
$kick = $level;
} else {
$kick = 0;
break;
}
} else {
$kick = 0;
break;
}
}
}
}
}
return $kick;
}
/**
* Get instance of metadata manager
*
* @since 1.0
* @return WPCAObjectManager
*/
public function metadata() {
if(!$this->metadata) {
$this->_init_metadata();
}
return $this->metadata;
}
/**
* Create and populate metadata fields
*
* @since 0.1
* @return void
*/
private function _init_metadata() {
$this->metadata = new WPCAObjectManager();
$this->metadata
->add(new WPCAMeta(
'role',
__('Synchronized Role'),
'',
'select',
array()
),'role')
->add(new WPCAMeta(
'handle',
_x('Action','option', 'restrict-user-access'),
0,
'select',
array(
0 => __('Redirect', 'restrict-user-access'),
1 => __('Tease & Include', 'restrict-user-access')
),
__('Redirect to another page or show teaser.', 'restrict-user-access')
),'handle')
->add(new WPCAMeta(
'page',
__('Page'),
0,
'select',
array(),
__('Page to redirect to or display content from under teaser.', 'restrict-user-access')
),'page')
->add(new WPCAMeta(
'duration',
__('Duration'),
'day',
'select',
array(
'day' => __('Day(s)','restrict-user-access'),
'week' => __('Week(s)','restrict-user-access'),
'month' => __('Month(s)','restrict-user-access'),
'year' => __('Year(s)','restrict-user-access')
),
__('Set to 0 for unlimited.', 'restrict-user-access')
),'duration')
->add(new WPCAMeta(
'caps',
__('Capabilities'),
array(),
'',
array(),
''
),'caps');
apply_filters('rua/metadata',$this->metadata);
}
/**
* Populate input fields for metadata
*
* @since 0.8
* @return void
*/
public function populate_metadata() {
$role_list = array(
'' => __('-- None --','restrict-user-access'),
-1 => __('Logged-in','restrict-user-access'),
0 => __('Not logged-in','restrict-user-access')
);
foreach(get_editable_roles() as $id => $role) {
$role_list[$id] = $role['name'];
}
$this->metadata()->get('role')->set_input_list($role_list);
}
/**
* Create restrict post type and add it to WPCACore
*
* @since 0.1
* @return void
*/
public function create_restrict_type() {
// Register the sidebar type
register_post_type(RUA_App::TYPE_RESTRICT,array(
'labels' => array(
'name' => __('Access Levels', 'restrict-user-access'),
'singular_name' => __('Access Level', 'restrict-user-access'),
'add_new' => _x('Add New', 'level', 'restrict-user-access'),
'add_new_item' => __('Add New Access Level', 'restrict-user-access'),
'edit_item' => __('Edit Access Level', 'restrict-user-access'),
'new_item' => __('New Access Level', 'restrict-user-access'),
'all_items' => __('Access Levels', 'restrict-user-access'),
'view_item' => __('View Access Level', 'restrict-user-access'),
'search_items' => __('Search Access Levels', 'restrict-user-access'),
'not_found' => __('No Access Levels found', 'restrict-user-access'),
'not_found_in_trash' => __('No Access Levels found in Trash', 'restrict-user-access'),
'parent_item_colon' => __('Extend Level', 'restrict-user-access')
),
'capabilities' => array(
'edit_post' => RUA_App::CAPABILITY,
'read_post' => RUA_App::CAPABILITY,
'delete_post' => RUA_App::CAPABILITY,
'edit_posts' => RUA_App::CAPABILITY,
'delete_posts' => RUA_App::CAPABILITY,
'edit_others_posts' => RUA_App::CAPABILITY,
'publish_posts' => RUA_App::CAPABILITY,
'read_private_posts' => RUA_App::CAPABILITY
),
'public' => false,
'hierarchical' => true,
'exclude_from_search' => true,
'publicly_queryable' => false,
'show_ui' => false,
'show_in_menu' => false,
'show_in_nav_menus' => false,
'show_in_admin_bar' => false,
'has_archive' => false,
'rewrite' => false,
'query_var' => false,
'supports' => array('title','page-attributes'),
'can_export' => false,
'delete_with_user' => false
));
WPCACore::types()->add(RUA_App::TYPE_RESTRICT);
}
/**
* Add level to user
*
* NOTE: Since 0.16.1-mattys101, changed to use 'update_user_meta' to
* ensure re-adding an expired level is correctly treated as adding
* a new level.
*
* @since 0.3
* @param int $user_id
* @param int $level_id
* @return int|boolean
*/
public function add_user_level($user_id,$level_id) {
if(!$this->has_user_level($user_id,$level_id)) {
$this->reset_user_levels_caps( $user_id );
$user_level = true;
if ( !in_array($level_id, get_user_meta($user_id, RUA_App::META_PREFIX.'level', $level_id)) ) {
$user_level = add_user_meta( $user_id, RUA_App::META_PREFIX.'level', $level_id, false);
}
if($user_level) {
update_user_meta($user_id, RUA_App::META_PREFIX.'level_'.$level_id, time());
}
return $level_id;
}
return false;
}
/**
* Renew a level to user, only if the level is currently held and has a duration.
* Returns FALSE if the renewal is not performed.
*
* If $once_per_period is TRUE (the default), the membership is not renewed if the
* latest renewal is already in the future. That is, only one renewal can be performed
* per period. Setting $once_per_period to FALSE will allow multiple renews to be
* performed, extending the period by one duration each time.
*
* NOTE: Since 'has_user_level' excludes expired levels, an expired level cannot
* be renewed, instead it must be re-added using 'add_user_level'.
* The (wanted) side-effect of this is that renewing before expiry maintains
* the original start date, while re-adding changes the start date of the
* membership.
*
* @since 0.16.1-mattys101
* @param int $user_id
* @param int $level_id
* @param boolean $once_per_period (default: true)
* @return int|boolean
*/
public function renew_user_level($user_id, $level_id, $once_per_period=true) {
if($this->has_user_level($user_id,$level_id)) {
$renewed = false;
$time = $this->get_user_level_start($user_id, $level_id);
$renew_time = $this->get_user_level_renew($user_id, $level_id);
// Only allow one renew per period
if ($once_per_period && $renew_time && $renew_time > time()) {
return false;
}
if ($renew_time && $renew_time > $time) {
$time = $renew_time;
}
$duration = $this->metadata()->get('duration')->get_data($level_id);
if( isset($duration['count'], $duration['unit']) && $time && $duration['count'] ) {
$time = strtotime('+'.$duration['count'].' '.$duration['unit'], $time);
$renewed = update_user_meta($user_id, RUA_App::META_PREFIX.'level_renew_'.$level_id, $time);
}
if ($renewed) {
return $level_id;
}
}
return false;
}
/**
* Remove level from user
*
* @since 0.3
* @param $int $user_id
* @param $int $level_id
* @return boolean
*/
public function remove_user_level($user_id,$level_id) {
$this->reset_user_levels_caps( $user_id );
return delete_user_meta($user_id,RUA_App::META_PREFIX.'level',$level_id) &&
delete_user_meta($user_id,RUA_App::META_PREFIX.'level_'.$level_id) &&
( delete_user_meta($user_id,RUA_App::META_PREFIX.'level_renew_'.$level_id) || true );
}
/**
* Get roles for specific user
* For internal use only
*
* @since 0.1
* @param WP_User $user
* @return array
*/
public function get_user_roles($user_id = null) {
$roles = array();
if(is_user_logged_in()) {
if(!$user_id) {
$user = wp_get_current_user();
} else {
$user = get_user_by('id',$user_id);
}
$roles = $user->roles;
$roles[] = '-1'; //logged-in
} else {
$roles[] = '0'; //not logged-in
}
return $roles;
}
/**
* Check if user has level
*
* @since 0.6
* @param int $user_id
* @param int $level
* @return boolean
*/
public function has_user_level($user_id, $level) {
return in_array($level, $this->get_user_levels($user_id,false,false));
}
/**
* Get user levels
* Traversed to their root
* Include levels synced with role
*
* @since 0.3
* @param WP_User $user
* @param boolean $hierarchical
* @param boolean $synced_roles
* @param boolean $include_expired
* @return array
*/
public function get_user_levels(
$user_id = null,
$hierarchical = true,
$synced_roles = true,
$include_expired = false
) {
$all_levels = RUA_App::instance()->get_levels();
$levels = array();
if(!$user_id && is_user_logged_in()) {
$user_id = wp_get_current_user();
$user_id = $user_id->ID;
}
if($user_id) {
$user_levels = get_user_meta($user_id, RUA_App::META_PREFIX.'level', false);
foreach ($user_levels as $level) {
//Only get user levels that are active
if(isset($all_levels[$level]) && $all_levels[$level]->post_status == RUA_App::STATUS_ACTIVE) {
if($include_expired || !$this->is_user_level_expired($user_id,$level)) {
$levels[] = $level;
}
}
}
}
if($synced_roles) {
$user_roles = array_flip($this->get_user_roles($user_id));
foreach ($all_levels as $level) {
$synced_role = get_post_meta($level->ID,RUA_App::META_PREFIX.'role',true);
if($synced_role !== '' && isset($user_roles[$synced_role])) {
$levels[] = $level->ID;
}
}
}
if($hierarchical) {
foreach($levels as $level) {
$levels = array_merge($levels,get_post_ancestors((int)$level));
}
}
update_postmeta_cache($levels);
return $levels;
}
/**
* Get time of user level start
*
* @since 0.7
* @param WP_User $user
* @param int $level_id
* @return int
*/
public function get_user_level_start($user_id = null, $level_id) {
if($user_id || is_user_logged_in()) {
if(!$user_id) {
$user_id = wp_get_current_user();
$user_id = $user_id->ID;
}
return (int)get_user_meta($user_id,RUA_App::META_PREFIX.'level_'.$level_id,true);
}
return 0;
}
/**
* Get time of user level renewal (i.e. the time that the renewal
* should start, not strictly the time that the renewal was performed).
*
* @since 0.16.1-mattys101
* @param WP_User $user
* @param int $level_id
* @return int
*/
public function get_user_level_renew($user_id = null, $level_id) {
if($user_id || is_user_logged_in()) {
if(!$user_id) {
$user_id = wp_get_current_user();
$user_id = $user_id->ID;
}
return (int)get_user_meta($user_id,RUA_App::META_PREFIX.'level_renew_'.$level_id,true);
}
return 0;
}
/**
* Get time of user level expiry.
*
* Since 0.16.1-mattys101, consideres the 'renew' time not just the 'start' time.
*
* @since 0.5
* @param WP_User $user
* @param int $level_id
* @return int
*/
public function get_user_level_expiry($user_id = null, $level_id) {
if($user_id || is_user_logged_in()) {
if(!$user_id) {
$user_id = wp_get_current_user();
$user_id = $user_id->ID;
}
$time = $this->get_user_level_start($user_id,$level_id);
$renew_time = $this->get_user_level_renew($user_id,$level_id);
$duration = $this->metadata()->get('duration')->get_data($level_id);
if(isset($duration['count'],$duration['unit']) && $time && $duration['count']) {
if ($renew_time && $renew_time > $time) {
$time = $renew_time;
}
$time = strtotime('+'.$duration['count'].' '.$duration['unit']. ' 23:59',$time);
return $time;
}
}
return 0;
}
/**
* Check if user level is expired
*
* @since 0.5
* @param WP_User $user
* @param int $level_id
* @return boolean
*/
public function is_user_level_expired($user_id = null,$level_id) {
$time_expire = $this->get_user_level_expiry($user_id,$level_id);
return $time_expire && time() > $time_expire;
}
/**
* Check if current user has global access
*
* @since 0.6
* @param WP_User $user
* @return boolean
*/
public function _has_global_access($user = null) {
if(is_user_logged_in() && !$user) {
$user = wp_get_current_user();
}
$has_access = in_array('administrator',$this->get_user_roles());
return apply_filters('rua/user/global-access', $has_access, $user);
}
/**
* Get conditional restrictions
* and authorize access for user
*
* @since 0.1
* @return void
*/
public function authorize_access() {
if($this->_has_global_access()) {
return;
}
$posts = WPCACore::get_posts(RUA_App::TYPE_RESTRICT);
if ($posts) {
$kick = 0;
$levels = array_flip($this->get_user_levels());
foreach ($posts as $post) {
if(!isset($levels[$post->ID])) {
$kick = $post->ID;
} else {
$kick = 0;
break;
}
}
if(!$kick && is_user_logged_in()) {
$conditions = WPCACore::get_conditions(RUA_App::TYPE_RESTRICT);
foreach ($conditions as $condition => $level) {
//Check post type
if(isset($posts[$level])) {
$drip = get_post_meta($condition,RUA_App::META_PREFIX.'opt_drip',true);
//Restrict access to dripped content
if($drip && $this->metadata()->get('role')->get_data($level) === '') {
$start = $this->get_user_level_start(null,$level);
$drip_time = strtotime('+'.$drip.' days 00:00',$start);
if(time() <= $drip_time) {
$kick = $level;
} else {
$kick = 0;
break;
}
} else {
$kick = 0;
break;
}
}
}
}
if($kick) {
$action = $this->metadata()->get('handle')->get_data($kick);
self::$page = $this->metadata()->get('page')->get_data($kick);
switch($action) {
case 0:
$redirect = '';
$url = 'http'.( is_ssl() ? 's' : '' ).'://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
if(is_numeric(self::$page)) {
if(self::$page != get_the_ID()) {
$redirect = get_permalink(self::$page);
}
} else {
if($url != get_site_url().self::$page) {
$redirect = get_site_url().self::$page;
}
}
//only redirect if current page != redirect page
if($redirect) {
$url = remove_query_arg('redirect_to',urlencode($url));
wp_safe_redirect(add_query_arg(
'redirect_to',
$url,
$redirect
));
exit;
}
break;
case 1:
add_filter( 'the_content', array($this,'content_tease'), 8);
break;
default: break;
}
return;
}
}
}
/**
* Carry over page from restriction metadata
* @var integer
*/
public static $page = false;
/**
* Limit content to only show teaser and
* page content from restriction metadata
*
* @since 0.1
* @param string $content
* @return string
*/
public function content_tease( $content ) {
if ( preg_match( '/(<span id="more-[0-9]*"><\/span>)/', $content, $matches ) ) {
$teaser = explode($matches[0], $content, 2);
$content = $teaser[0];
} else {
$content = '';
}
if(is_numeric(self::$page)) {
setup_postdata(get_post(self::$page));
$content .= get_the_content();
wp_reset_postdata();
}
return $content;
}
/**
* Override user caps with level caps.
*
* @param array $allcaps
* @param string $cap
* @param array $args {
* @type string [0] Requested capability
* @type int [1] User ID
* @type WP_User [2] Associated object ID (User object)
* }
* @param WP_User $user
*
* @return array
*/
public function user_level_has_cap( $allcaps, $cap, $args, $user ) {
$global_access = $this->_has_global_access();
// if ($cap && $cap[0] == RUA_App::CAPABILITY && $global_access ) {
// $allcaps[ $cap[0] ] = true;
// }
if( !$global_access && defined('WPCA_VERSION') ) {
$allcaps = $this->get_user_levels_caps( $user->ID, $allcaps );
}
return $allcaps;
}
/**
* Get all user level capabilities (also checks hierarchy)
*
* @since 0.13
* @param int $user_id
* @param array $current_caps (optional preset)
* @return array
*/
public function get_user_levels_caps( $user_id, $current_caps = array() ) {
if( ! isset( $this->user_levels_caps[ $user_id ] ) ) {
$this->user_levels_caps[ $user_id ] = $current_caps;
$levels = $this->get_user_levels( $user_id );
if( $levels ) {
$this->user_levels_caps[$user_id] = array_merge(
$this->user_levels_caps[ $user_id ],
//Make sure higher levels have priority
//Side-effect: synced levels < normal levels
$this->get_levels_caps( array_reverse( $levels ) )
);
}
}
return $this->user_levels_caps[$user_id];
}
/**
* Get all capabilities of one or multiple levels
*
* If you pass an array the order of these levels should be set correctly!
* The first level caps will be overwritten by the second etc.
*
* @since 0.13
* @param array|int $levels
* @return array
*/
public function get_levels_caps( $levels ) {
$levels = (array) $levels;
$caps = array();
foreach ( $levels as $level ) {
$level_caps = $this->metadata()->get('caps')->get_data( $level, true );
foreach ( $level_caps as $key => $level_cap ) {
$caps[$key] = !!$level_cap;
}
}
return $caps;
}
/**
* Reset user level caps to trigger reload when `user_has_cap` filter is used.
*
* @since 0.16
* @param $user_id
*/
public function reset_user_levels_caps( $user_id ) {
unset( $this->user_levels_caps[ $user_id ] );
}
/**
* Maybe add level on user register
*
* @since 0.10
* @param int $user_id
* @return void
*/
public function registered_add_level($user_id) {
$level_id = get_option('rua-registration-level',0);
if($level_id) {
$this->add_user_level($user_id,$level_id);
}
}
/**
* Mediate file access, checking user levels.
*
* This method is based on the implementation provided by bueltge and
* kraftner on Stackexchange: https://wordpress.stackexchange.com/a/37765
*