wp_ai1ec_rss/index.php

<?php
/*
Plugin Name: All-in-One Event Calendar Rss
Plugin URI: 
Description: Produce un rss con gli eventi di All In One Event Calendar
Version: 0.0.1
Author: gin(e)
Author URI: 
License: GPL3
License URI: http://www.gnu.org/licenses/gpl-3.0.html
Text Domain: ai1ec_rss

@author		 gine
@category  social
@package	 Wordpress All-in-One Event Calendar Rss
@since		 0.0.1

Wordpress All In One Event Calendar Rss. A Plugin for WordPress.
Copyright (C) 2019 gine -

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 3 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/gpl-3.0.html.
*/

require_once(ABSPATH .'wp-includes/pluggable.php');

if ( ! defined( 'ABSPATH' ) ) :
	exit; // Exit if accessed directly
endif;

function set_ai1ecrss_join($join, &$wp_query) {
	global $wpdb;
	
	$db_prefix=$wpdb->prefix;
	$join .=" JOIN ".$db_prefix."ai1ec_events
				ON $wpdb->posts.ID = ".$db_prefix."ai1ec_events.post_id";
	
	return $join;
}

function set_ai1ecrss_where( $where, &$wp_query ){
	global $wpdb;
	
	$db_prefix=$wpdb->prefix;
	if(! is_admin() && $wp_query->post_type ='ai3ec_event'){
		date_default_timezone_set("Europe/Rome");
		
		$start = time()+ (7 * 24 * 60 * 60);
		$end = time();

		//$where .= ' AND '. $db_prefix.'ai1ec_events.start <= \''.$start.'\'' .' AND '. $db_prefix.'ai1ec_events.end >= \''.$end.'\'';
		$where .= ' AND '. $db_prefix.'ai1ec_events.start <= \''.$start.'\'';

		
		return $where;
	}
}

function set_ai1ecrss_orderby($orderby) {
	global $wpdb;
	
	$db_prefix=$wpdb->prefix;
	$orderby = $db_prefix."ai1ec_events.start DESC";
	return $orderby;
}

function getEvent($cat){
	$args=Array(
		'post_type'=> 'ai1ec_event',
		'no_found_rows' => 1,
		'showposts' => 10
	);	

	if($cat != "all" ) {
		$args['tax_query'] = array(
			Array(
				'taxonomy' => 'events_categories',
        'field' => 'slug',
        'terms' => Array($cat),
			)		
		);
	}

	//var_dump($args);
	add_filter(	'posts_join', 'set_ai1ecrss_join',10,2 );
	add_filter( 'posts_where', 'set_ai1ecrss_where', 10, 2 );
	add_filter(	'posts_orderby', 'set_ai1ecrss_orderby' );
	//http://codex.wordpress.org/Class_Reference/WP_Query
	$cat_query = new WP_Query($args);
	remove_filter( 'posts_join', 'set_ai1ecrss_join' );
	remove_filter( 'posts_where', 'set_ai1ecrss_where' );
	remove_filter( 'posts_orderby', 'set_ai1ecrss_orderby' );

	header('Content-Type: '.feed_content_type('rss-http').'; charset='.get_option('blog_charset'), true);
	echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
	<rss version="2.0"
		xmlns:content="http://purl.org/rss/1.0/modules/content/"
		xmlns:wfw="http://wellformedweb.org/CommentAPI/"
		xmlns:dc="http://purl.org/dc/elements/1.1/"
		xmlns:atom="http://www.w3.org/2005/Atom"
		xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
		xmlns:slash="http://purl.org/rss/1.0/modules/slash/">

		<channel>
			<title><?php bloginfo_rss('name'); ?> - Events Feed</title>
			<atom:link href="<?php self_link(); ?>" rel="self" type="application/rss+xml" />
			<link><?php bloginfo_rss('url') ?></link>
			<description><?php bloginfo_rss('description') ?></description>
			<lastBuildDate><?php echo mysql2date('D, d M Y H:i:s +0000', get_lastpostmodified('GMT'), false); ?></lastBuildDate>
			<language><?php echo get_option('rss_language'); ?></language>
			<sy:updatePeriod><?php echo apply_filters( 'rss_update_period', 'hourly' ); ?></sy:updatePeriod>
			<sy:updateFrequency><?php echo apply_filters( 'rss_update_frequency', '1' ); ?></sy:updateFrequency>

		<?php if($cat_query->have_posts()): ?>
        <?php while($cat_query->have_posts()) : $cat_query->the_post(); ?>
					<item>
						<title><?php the_title_rss(); ?></title>
						<link><?php the_permalink_rss(); ?></link>
						<pubDate><?php echo mysql2date('D, d M Y H:i:s +0000', get_post_time('Y-m-d H:i:s', true), false); ?></pubDate>
						<guid isPermaLink="false"><?php the_guid(); ?></guid>
						<description><![CDATA[<?php the_excerpt_rss() ?>]]></description>
						<content:encoded><![CDATA[<?php the_excerpt_rss() ?>]]></content:encoded>
						<?php rss_enclosure(); ?>
						<?php do_action('rss2_item'); ?>
					</item>
        <?php endwhile; ?>
		<?php endif; ?>
		</channel>
	</rss>
<?php
}

function debug($args){ ?>
	<html><head></head><body>ciao</body></html><?php
}

function wds_ai1ec_rss_restapi_endpoint() {
   add_rewrite_tag( '%ai1ecrss%', '([^&]+)' );
   add_rewrite_rule( '%/wp_ai1ec_rss/([^&]+)/?', 'index.php?ai1ecrss=$matches[1]', 'top' );
}

add_action( 'init', 'wds_ai1ec_rss_restapi_endpoint' );

function wds_ai1ec_rss_restapi_endpoint_call() {
  global $wp_query;

  $category = $wp_query->get( 'ai1ecrss' );
  if ( ! $category)
		return;

	getEvent($category);

	die;
}

add_action( 'template_redirect', 'wds_ai1ec_rss_restapi_endpoint_call' );