publish-to-network.php

<?php
/**
 * Plugin Name: Publish to Network 
 * Plugin URI:  https://gist.github.com/brasofilo/7036415
 * Description: Meta box that allows publishing a post to another site of the network
 * Version:     1.0
 * Author:      Rodolfo Buaiz
 * Author URI:  http://wordpress.stackexchange.com/users/12615/brasofilo
 * Text Domain: sepw
 * Domain Path: /languages
 * License:     GPLv2 or later
 */ 

/*
Publish to Network 
Copyright (C) 2013  Rodolfo Buaiz

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, see <http://www.gnu.org/licenses/>.
*/

add_action(
    'plugins_loaded',
	array ( B5F_Publish_To_Network::get_instance(), 'plugin_setup' )
);
 
class B5F_Publish_To_Network
{
	/**
	 * Plugin instance.
	 *
	 * @see get_instance()
	 * @type object
	 */
	protected static $instance = NULL;
 
    
	/**
	 * URL to this plugin's directory.
	 *
	 * @type string
	 */
	public $plugin_url = '';
 
    
	/**
	 * Path to this plugin's directory.
	 *
	 * @type string
	 */
	public $plugin_path = '';
 
    
	/**
	 * Meta data name.
	 *
	 * @type string
	 */
	private $plugin_meta = '_network_published';
 
    
	/**
	 * Constructor. Intentionally left empty and public.
	 *
	 * @see plugin_setup()
	 * @since 2012.09.12
	 */
	public function __construct() {}
 
    
	/**
	 * Access this plugin’s working instance
	 *
	 * @wp-hook plugins_loaded
	 * @since   2012.09.13
	 * @return  object of this class
	 */
	public static function get_instance()
	{
		NULL === self::$instance and self::$instance = new self;
 
		return self::$instance;
	}
 
    
	/**
	 * Used for regular plugin work.
	 *
	 * @wp-hook plugins_loaded
	 * @since   2012.09.10
	 * @return  void
	 */
	public function plugin_setup()
	{
		$this->plugin_url    = plugins_url( '/', __FILE__ );
		$this->plugin_path   = plugin_dir_path( __FILE__ );
		$this->load_language( 'plugin_unique_name' );
 
		if( is_multisite() )
		{
			add_action( 'save_post', array( $this, 'cross_publish' ), 10, 2 );
			add_action( 'add_meta_boxes_post', array( $this, 'add_custom_box' ) );
		} else
			add_action( 'after_plugin_row_publish-to-network/publish-to-network.php', array( $this, 'plugin_row' ) );
	}
 
    
    /**
     * Warning when activated on single sites
     */
	public function plugin_row()
	{
		echo '<tr class="plugin-update-tr"><td colspan="3" class="plugin-update colspanchange"><div class="update-message" style="font-size: 1.3em; color:#f00">This plugin only works in Multisite! And does nothing in single sites.</div></td></tr>';
	}

    
	/**
	 * Add meta boxes.
	 *
	 * @wp-hook add_meta_boxes_post
	 * @since   2013.09.09
	 * @return  void
	 */
	public function add_custom_box() 
	{
		global $post;
		$termid = get_post_meta( $post->ID, $this->plugin_meta, true );
		if( empty( $termid ) || 'none' == $termid )
		{
		    add_meta_box( 
		        'sectionid',
		        __( 'Post to other site of the network' ),
		        array( $this, 'inner_custom_box' ),
		        'post',
		        'side',
		        'high'
		    );
		}
		elseif( 'donotshow' != $termid )
		{
			$details = get_blog_details( $termid['bid'] );
			$site = sprintf(
				'<a href="%s" target="_blank" style="font-size:1.2em">%s</a>',
				$details->siteurl,
				$details->blogname
			);
		    add_meta_box( 
		        'sectionid',
		        __( 'Posted to: ' ) . $site,
		        array( $this, 'inner_posted_box' ),
		        'post',
		        'side',
		        'high'
		    );
		}
	}
	
    
	/**
	 * Meta box for publishing post
	 *
	 * @wp-hook add_meta_box
	 * @param   object $post
	 * @since   2013.09.09
	 * @return  void
	 */
	public function inner_custom_box( $post )
	{
	    $blogs = $this->get_blogs();
		echo '<select name="my_blog_id" id="my_blog_id">';	
		echo "<option value='0'>- Don't publish -</option>";
		foreach ( $blogs as $site ) 
		{
			if( get_current_blog_id() != $site->blog_id )
			{
				$details = get_blog_details( $site->blog_id );
				printf(
					'<option value="%s" title="%s">%s</option>',
					$site->blog_id,
					$site->domain,
					$details->blogname
				);
			}
		}	
		echo '</select>
		<div id="feedback" class="misc-pub-section"><small>Destination Site:</small><br><label for="my_blog_id">&nbsp;</label></div>';
		echo '<label><input type="checkbox" name="disable_cross_publish" /> Remove this box</label>';
	    wp_nonce_field( plugin_basename( __FILE__ ), 'B5F_Publish_To_Network' );
		$this->print_script();
	}
	
    
	/**
	 * Meta box for published posts
	 *
	 * @wp-hook add_meta_box
	 * @param   object $post
	 * @since   2013.09.09
	 * @return  void
	 */
	public function inner_posted_box( $post )
	{
		$termid = get_post_meta( $post->ID, $this->plugin_meta, true );
		if( !empty( $termid ) )
		{
			$details = get_blog_details( $termid['bid'] );
	        switch_to_blog( $termid['bid'] );
			$po = get_post( $termid['pid'] );
			$perma = get_edit_post_link( $termid['pid'] );
	        restore_current_blog();	
			printf(
				'<p><a href="%s" target="_blank">%s</a></p>',
				$perma,
				$po->post_title
			);
		}
	}
	
    
	/**
	 * jQuery for live Checkbox
	 *
	 * @since   2013.09.09
	 * @return  void
	 */
	private function print_script()
	{
		echo <<<HTML
<script type="text/javascript">
jQuery(document).ready( function($) 
{
	$('#feedback label').html( $('#my_blog_id').children("option:selected").attr('title') );

	$('#my_blog_id').live('change', function()
	{
		var site_domain = $(this).children("option:selected").attr('title');
		var site_name = $(this).children("option:selected").text();
		$('#feedback label').html(site_domain);
	});					
});    
</script>
HTML;
	
	}


	/**
	 * Save post action.
	 *
	 * @wp-hook save_post
	 * @param   integer $post_id
	 * @param   object $post_object
	 * @since   2013.09.09
	 * @return  void
	 */
	public function cross_publish( $post_id, $post_object )
	{
	    if( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
	        return;

	    if( defined( 'DOING_AJAX' ) && DOING_AJAX )
	        return;

	    if ( !wp_verify_nonce( $_POST['B5F_Publish_To_Network'], plugin_basename( __FILE__ ) ) )
	        return;

	    # Block auto-drafts and revisions
	    if( in_array( $post_object->post_status, array( 'auto-draft', 'inherit' ) ) )
	        return;

	    $termid = get_post_meta( $post_id, $this->plugin_meta, true );

		if( isset( $_POST['disable_cross_publish'] ) )
		{
			update_post_meta( $post_id, $this->plugin_meta, 'donotshow' );
			return;
		}
		
	    # It's a new post
	    if( empty( $termid ) && isset( $_POST['my_blog_id'] ) )
	    {
			if( '0' == $_POST['my_blog_id'] )
			{
				update_post_meta( $post_id, $this->plugin_meta, 'none' );
				return;
			}
				
	        remove_action( 'save_post', array( $this, 'cross_publish' ) );
	        switch_to_blog( $_POST['my_blog_id'] );
	        $my_post = array(
	          'post_title'    => $post_object->post_title,
	          'post_content'  => $post_object->post_content,
	          'post_status'   => 'publish',
	          'post_author'   => $post_object->post_author,
	        );
	        $new_post = wp_insert_post( $my_post );
	        restore_current_blog();
	        add_action( 'save_post', array( $this, 'cross_publish' ), 10, 2 );
	        update_post_meta( 
				$post_id, 
				$this->plugin_meta, 
				array(
					'pid' => $new_post,
					'bid' => $_POST['my_blog_id']
				)
			);
	    }
	}

    
    /**
     * Get blogs list
     * 
     * @return array List of blog ids
     */
    private function get_blogs()
    {
        // get blog list from cache
        $blogs = get_site_transient( 'multisite_blog_list' );

        if ( FALSE === $blogs ) {

            global $wpdb;
            $blogs = $wpdb->get_results(
                $wpdb->prepare( "
                    SELECT blog_id, domain
                    FROM $wpdb->blogs
                    WHERE site_id = %d 
                    AND public = '1' 
                    AND archived = '0' 
                    AND mature = '0' 
                    AND spam = '0' 
                    AND deleted = '0' 
                    ORDER BY registered ASC
                ", $wpdb->siteid ) );
            // Set the Transient cache
            set_site_transient( 'multisite_blog_list', $blogs, 60*60 );  
        }
        return $blogs;
    }

    /**
	 * Loads translation file.
	 *
	 * Accessible to other classes to load different language files (admin and
	 * front-end for example).
	 *
	 * @wp-hook init
	 * @param   string $domain
	 * @since   2012.09.11
	 * @return  void
	 */
	public function load_language( $domain )
	{
		load_plugin_textdomain(
			$domain,
			FALSE,
			$this->plugin_path . 'languages'
		);
	}
}