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toxid-preview.php
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toxid-preview.php
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<?php
/**
* Plugin Name: TOXID Preview
* Plugin URI: http://toxid.org/
* Description: Preview for logged in Admin Users via query param.
* Version: 1.0
* Author: Joscha Krug
* Author URI: http://www.marmalade.de
*
* Plugin mostly copied from
* Public Post Preview
* Original-Author: Dominik Schilling
* URI: http://wphelper.de/
* Original Plugin URI: https://dominikschilling.de/wp-plugins/public-post-preview/en/
*
* License: GPLv2 or later
*
* Previously (2009-2011) maintained by Jonathan Dingman and Matt Martz.
*
* Copyright (C) 2012-2016 Dominik Schilling
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/**
* Don't call this file directly.
*/
if ( ! class_exists( 'WP' ) ) {
die();
}
/**
* The class which controls the plugin.
*
* Inits at 'plugins_loaded' hook.
*/
class TOXID_Preview {
/**
* Registers actions and filters.
*
* @since 1.0.0
*/
public static function init() {
if ( ! is_admin() ) {
add_filter( 'pre_get_posts', array( __CLASS__, 'show_public_preview' ) );
add_filter( 'query_vars', array( __CLASS__, 'add_query_var' ) );
// Add the query var to WordPress SEO by Yoast whitelist.
add_filter( 'wpseo_whitelist_permalink_vars', array( __CLASS__, 'add_query_var' ) );
}
}
public static function init_admin()
{
//ToDo Finish settings in backend
/*register_setting('general', 'toxid_preview_password');
add_settings_section('toxid-settings', 'TOXID', '__return_false', 'general');
add_settings_field('toxid_preview_password', ' Password for previews', array(&$this, 'admin_toxid_preview_theme_field'), 'general', 'toxid-settings');
*/
}
function admin_toxid_preview_theme_field()
{
//ToDo finish settings in Backend
/*$themes = array_keys(get_themes());
$currentTheme = get_option('toxid_preview_theme');
echo '<input name="toxid_preview_password">';
echo '<option>' . __('None') . '</option>';
foreach ($themes as $theme) {
printf('<option value="%s" %s>%s</option>', esc_attr($theme), ($theme == $currentTheme ? 'selected' : ''), esc_html($theme));
}
echo '</select>';*/
}
/**
* Registers the new query var `_ppp`.
*
* @since 2.1.0
*
* @param array $qv Existing list of query variables.
* @return array List of query variables.
*/
public static function add_query_var( $qv ) {
$qv[] = 'toxid-preview';
return $qv;
}
/**
* Registers the filter to handle a public preview.
*
* Filter will be set if it's the main query, a preview, a singular page
* and the query var `_ppp` exists.
*
* @since 2.0.0
*
* @param object $query The WP_Query object.
* @return object The WP_Query object, unchanged.
*/
public static function show_public_preview( $query ) {
if (
$query->is_main_query() &&
$query->is_preview() &&
$query->is_singular() &&
$query->get( 'toxid-preview' )
) {
add_filter( 'posts_results', array( __CLASS__, 'set_post_to_publish' ), 10, 2 );
}
return $query;
}
/**
* Checks if a public preview is available and allowed.
* Verifies the nonce and if the post id is registered for a public preview.
*
* @since 2.0.0
*
* @param int $post_id The post id.
* @return bool True if a public preview is allowed, false on a failure.
*/
private static function is_public_preview_available( $post_id ) {return true;
if ( empty( $post_id ) ) {
return false;
}
if ( ! self::verify_nonce( get_query_var( 'toxid-preview' )) ) {
wp_die( __( 'Your preview settings are incorrect. Please verify the password in OXID and Wordpress!', 'public-post-preview' ) );
}
return true;
}
/**
* Sets the post status of the first post to publish, so we don't have to do anything
* *too* hacky to get it to load the preview.
*
* @since 2.0.0
*
* @param array $posts The post to preview.
* @return array The post that is being previewed.
*/
public static function set_post_to_publish( $posts ) {
// Remove the filter again, otherwise it will be applied to other queries too.
remove_filter( 'posts_results', array( __CLASS__, 'set_post_to_publish' ), 10 );
if ( empty( $posts ) ) {
return;
}
$post_id = $posts[0]->ID;
// If the post has gone live, redirect to it's proper permalink.
//self::maybe_redirect_to_published_post( $post_id );
if ( self::is_public_preview_available( $post_id ) ) {
// Set post status to publish so that it's visible.
$posts[0]->post_status = 'publish';
// Disable comments and pings for this post.
add_filter( 'comments_open', '__return_false' );
add_filter( 'pings_open', '__return_false' );
add_filter( 'wp_link_pages_link', array( __CLASS__, 'filter_wp_link_pages_link' ), 10, 2 );
}
return $posts;
}
/**
* Verifies that correct nonce was used with time limit. Without an UID.
*
* @since 1.0.0
*
* @param string $nonce Nonce that was used in the form to verify.
* @param string|int $action Should give context to what is taking place and be the same when nonce was created.
* @return bool Whether the nonce check passed or failed.
*/
private static function verify_nonce( $nonce ) {
//ToDo verify the hash as set in the settings from wordpress
if ( true ) {
return 1;
}
// Invalid nonce.
return false;
}
}
add_action( 'plugins_loaded', array( 'TOXID_Preview', 'init' ) );