em-ical.php
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<?php
/**
* generates an ical feed on init if url is correct
*/
function em_ical( ){
//check if this is a calendar request for all events
if ( preg_match('/events.ics(\?.+)?$/', $_SERVER['REQUEST_URI']) || $_SERVER['REQUEST_URI'] == '/?ical=1' ) {
header('Content-Type: text/calendar; charset=utf-8');
header('Content-Disposition: inline; filename="events.ics"');
//send headers
em_locate_template('templates/ical.php', true);
die();
}
}
add_action ( 'init', 'em_ical' );
/**
* Generates an ics file for a single event
*/
function em_ical_item(){
global $wpdb, $wp_query;
//check if we're outputting an ical feed
if( !empty($wp_query) && $wp_query->get('ical') ){
$filename = 'events';
$args = array();
//single event
if( $wp_query->get(EM_POST_TYPE_EVENT) ){
$event_id = $wpdb->get_var('SELECT event_id FROM '.EM_EVENTS_TABLE." WHERE event_slug='".$wp_query->get(EM_POST_TYPE_EVENT)."' AND event_status=1 LIMIT 1");
if( !empty($event_id) ){
$filename = $wp_query->get(EM_POST_TYPE_EVENT);
$args['event'] = $event_id;
}
//single location
}elseif( $wp_query->get(EM_POST_TYPE_LOCATION) ){
$location_id = $wpdb->get_var('SELECT location_id FROM '.EM_LOCATIONS_TABLE." WHERE location_slug='".$wp_query->get(EM_POST_TYPE_LOCATION)."' AND location_status=1 LIMIT 1");
if( !empty($location_id) ){
$filename = $wp_query->get(EM_POST_TYPE_LOCATION);
$args['location'] = $location_id;
}
//taxonomies
}else{
$taxonomies = EM_Object::get_taxonomies();
foreach($taxonomies as $tax_arg => $taxonomy_info){
$taxonomy_term = $wp_query->get($taxonomy_info['query_var']);
if( $taxonomy_term ){
$filename = $taxonomy_term;
$args[$tax_arg] = $taxonomy_term;
}
}
}
//only output the ical if we have a match from above
if( count($args) > 0 ){
//send headers and output ical
header('Content-type: text/calendar; charset=utf-8');
header('Content-Disposition: inline; filename="'.$filename.'.ics"');
em_locate_template('templates/ical.php', true, array('args'=>$args));
exit();
}else{
//no item exists, so redirect to original URL
$url_to_redirect = preg_replace("/ical\/$/",'', esc_url_raw(add_query_arg(array('ical'=>null))));
wp_safe_redirect($url_to_redirect, '302');
exit();
}
}
}
add_action ( 'parse_query', 'em_ical_item' );
/**
* A utf-8 safe wordwrap function, avoiding CRLF issues with Chinese and other multi-byte characters.
* @param string $string
* @return string
*/
function em_mb_ical_wordwrap($string){
if( function_exists('mb_strcut') && (!defined('EM_MB_ICAL_WORDWRAP') || EM_MB_ICAL_WORDWRAP) ){
$return = '';
for ( $i = 0; strlen($string) > 0; $i++ ) {
$linewidth = ($i == 0? 75 : 74);
$linesize = (strlen($string) > $linewidth? $linewidth: strlen($string));
if($i > 0) $return .= "\r\n ";
$return .= mb_strcut($string,0,$linesize);
$string = mb_strcut($string,$linewidth);
}
return $return;
}
return wordwrap($string, 75, "\r\n ", true);
}
?>