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sc-event-ical-feed.php
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sc-event-ical-feed.php
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<?php
class SC_Event_ICal_Feed {
public function __construct() {
add_action( 'init', array( $this, 'init' ) );
add_action( 'pre_get_posts', array( $this, 'pre_get_posts' ), 10 );
// Testing!
// add_action( 'dynamic_sidebar', array( $this, 'dynamic_sidebar' ) );
}
public function dynamic_sidebar() {
$link = sc_get_ical_link();
$link_text = '+ iCal';
if( !$link ) {
$link = sc_get_ical_feed_link();
$link_text = '+ iCal Feed';
}
if( $link ) {
echo '<p><a href="' . esc_url( $link ) . '">' . $link_text . '</a></p>';
}
}
public function init() {
add_feed( 'ical', array( $this, 'ical_feed' ) );
}
public function ical_feed() {
global $wp_query;
if ( !have_posts() ) {
$wp_query->set_404();
$wp_query->max_num_pages = 0;
header('Content-Type: text/html; charset=' . get_option('blog_charset'), true);
locate_template( '404.php', true );
die();
}
$display_format = '';
if( isset( $_GET['format'] ) ) {
$display_format = strtolower( $_GET['format'] );
}
if( $display_format == 'xml' ) {
nocache_headers();
header('Content-Type: text/xml; charset=' . get_option('blog_charset'), true);
}
if( $display_format == 'json' ) {
nocache_headers();
header('Content-Type: application/json; charset=' . get_option('blog_charset'), true);
}
//TODO: Add filters for these things
$calendar_name = get_bloginfo( 'name' ) . ' Events';
$calendar_description = 'Events found on ' . get_site_url();
$timezone = get_option( 'timezone_string' ); // define time zone
$args = array(
'unique_id' => get_site_url(),
'TZID' => $timezone,
);
$v = new vcalendar( $args ); // create a new calendar instance
$v->setProperty( 'method', 'PUBLISH' ); // required of some calendar software
$v->setProperty( 'x-wr-calname', $calendar_name ); // required of some calendar software
$v->setProperty( 'X-WR-CALDESC', $calendar_description ); // required of some calendar software
$v->setProperty( 'X-WR-TIMEZONE', $timezone ); // required of some calendar software
$xprops = array( 'X-LIC-LOCATION' => $timezone ); // required of some calendar software
iCalUtilityFunctions::createTimezone( $v, $timezone, $xprops ); // create timezone component(-s) opt. 1 based on present date
while ( have_posts() ) : the_post();
$event_id = get_the_ID();
$event = get_post( $event_id );
$event_date = sc_get_event_date( $event_id );
$event_time = sc_get_event_time( $event_id );
$event_start = strtotime( $event_date . ' ' . $event_time['start'] );
$event_end = strtotime( $event_date . ' ' . $event_time['end'] );
$event_location = '';
if( function_exists( 'sc_get_event_address' ) ) {
$event_location = sc_get_event_address();
}
$event_description = apply_filters( 'sc_ical_event_description', get_the_content(), $event );
$event_description = sc_html2plain( $event_description );
$vevent = &$v->newComponent( 'vevent' ); // create an event calendar component
$start = array(
'year' => date( 'Y', $event_start ),
'month' => date( 'n', $event_start ),
'day' => date( 'j', $event_start ),
'hour' => date( 'G', $event_start ),
'min' => date( 'i', $event_start ),
'sec' => date( 's', $event_start ),
);
$vevent->setProperty( 'dtstart', $start );
$end = array(
'year' => date( 'Y', $event_end ),
'month' => date( 'n', $event_end ),
'day' => date( 'j', $event_end ),
'hour' => date( 'G', $event_end ),
'min' => date( 'i', $event_end ),
'sec' => date( 's', $event_end ),
);
$vevent->setProperty( 'dtend', $end );
$vevent->setProperty( 'LOCATION', $event_location ); // property name - case independent
if( function_exists( 'sc_get_the_organizer' ) ) {
$organizer_details = sc_get_the_organizer( $event_id );
$organizer_details = array_filter( $organizer_details );
if( isset( $organizer_details['name'] ) && isset( $organizer_details['email'] ) ) {
$organizer_args = array(
'CN' => $organizer_details['name'],
);
$x_params = array( 'Phone', 'Website' );
foreach( $x_params as $param ) {
$lowercase_param = strtolower( $param );
if( isset( $organizer_details[ $lowercase_param ] ) ) {
$arg_key = 'X-' . $param;
$val = $organizer_details[ $lowercase_param ];
$organizer_args[ $arg_key ] = $val;
}
}
$vevent->setProperty( 'organizer' , $organizer_details['email'], $organizer_args );
}
}
$vevent->setProperty( 'summary', $event->post_title );
$vevent->setProperty( 'description', $event_description );
endwhile;
// all calendar components are described in rfc5545
// a complete method list in iCalcreator manual
iCalUtilityFunctions::createTimezone( $v, $timezone, $xprops);
// create timezone component(-s) opt. 2
// based on all start dates in events (i.e. dtstart)
if( $display_format == 'xml' ) {
echo iCal2XML( $v );
exit();
}
if( $display_format == 'json' ) {
$xml = simplexml_load_string( iCal2XML( $v ) );
echo json_encode( $xml );
exit();
}
$v->returnCalendar(); // redirect calendar file to browser
exit();
}
public function pre_get_posts( $query ) {
if( !is_feed( 'ical' ) || !$query->is_main_query() || is_admin() ) {
return;
}
$query->set( 'post_type', 'sc_event' );
if( $query->get_queried_object() && !is_post_type_archive( 'sc_event' ) && !is_singular( 'sc_event' ) ) {
$query->set( 'orderby', 'meta_value_num' );
$query->set( 'meta_key', 'sc_event_date_time' );
$query->set( 'order', 'DESC' );
if( isset( $_GET['event-display'] ) ) {
$mode = urldecode( $_GET['event-display'] );
$query->set( 'meta_value', current_time('timestamp') );
switch($mode) {
case 'past':
$query->set('meta_compare', '<');
break;
case 'upcoming':
$query->set('meta_compare', '>=');
break;
}
}
if( isset( $_GET['event-order'] ) ) {
$order = urldecode( $_GET['event-order'] );
$query->set( 'order', $order );
}
}
$posts_per_rss = apply_filters( 'sc_number_of_ical_feed_items', 250 );
$query->set( 'posts_per_rss', $posts_per_rss );
}
}
global $sc_event_ical_feed;
$sc_event_ical_feed = new SC_Event_ICal_Feed();
function sc_get_ical_link( $event_id = 0 ) {
$event_id = intval( $event_id );
if( $event_id ) {
if( $url = get_permalink( $event_id ) ) {
return $url . 'ical/';
}
}
if( is_singular( 'sc_event' ) ) {
$event = get_post();
$event_id = $event->ID;
$ical_feed_link = '';
if( $url = get_permalink( $event_id ) ) {
$ical_feed_link = $url . 'ical/';
}
return $ical_feed_link;
}
}
function sc_get_ical_feed_link() {
global $wp;
$allowed_ical_feed_tax = apply_filters( 'sc_allowed_ical_feed_tax', get_object_taxonomies( 'sc_event' ) );
if( is_tax( $allowed_ical_feed_tax ) ) {
$url = home_url( add_query_arg( array(),$wp->request ) ); // via http://stephenharris.info/how-to-get-the-current-url-in-wordpress/
// Strip any pagination...
$url = preg_replace( '/\/page\/(\d+)/i', '', $url );
return trailingslashit( $url ) . 'ical/';
}
// Generic, all events.
return get_post_type_archive_link( 'sc_event' ) . 'ical/';
}