EoEventsRestAPI.php

<?php
/**
 * Class EoEventsRestAPI
 * @version 1.0.0
 * @see https://gist.github.com/vollyimnetz/d694276674f3d38fcbecbfa34a2750be
 *
 * This class is responsible for registering the REST API endpoint for the events
 * and handling the request.
 * The endpoint is registered under /wp-json/eo/v1/events
 * The endpoint accepts the following parameters:
 * - limit: The number of events to return
 * - event_end_after: The date after which the events should end
 * The endpoint returns an array of events.
 */
class EoEventsRestAPI {
	public static function init() {
		add_action( 'rest_api_init', [ __CLASS__, 'register_rest' ] );
	}

	public static function register_rest() {
		register_rest_route( 'eo/v1', '/events', [
			'methods' => 'GET',
			'callback' => [ __CLASS__, 'search_event' ],
			'args' => [
				'limit' => [ 'validate_callback' => function( $param, $request, $key ) { return is_numeric( $param ); } ],
				'event_end_after' => [ 'validate_callback' => function( $param, $request, $key ) { return is_string( $param ); }, 'default' => 'today' ],
				'search' => [ 'validate_callback' => function( $param, $request, $key ) { return is_string( $param ); } ],
				'category' => [ 'validate_callback' => function( $param, $request, $key ) { return is_string( $param ); } ],
				'categoryIds' => [ 'validate_callback' => function( $param, $request, $key ) { return is_string( $param ); } ],
				'tag' => [ 'validate_callback' => function( $param, $request, $key ) { return is_string( $param ); } ],
				'tagIds' => [ 'validate_callback' => function( $param, $request, $key ) { return is_string( $param ); } ],
			],
			'permission_callback' => '__return_true',
		] );
	}

	public static function search_event( $request ) {
		try {
			$available_params = [ 'limit', 'event_end_after', 'search', 'category', 'categoryIds', 'tag', 'tagIds' ];
			$result = [];
			$queryArgs = [];

			foreach( $available_params as $param ) {
				$tmp = $request->get_param( $param );
				switch( $param ) {
					case 'limit':
						$queryArgs[ 'posts_per_page' ] = intval( $tmp );
						break;
					case 'event_end_after':
						if(empty($tmp)) $tmp = 'today';
						$queryArgs[ 'event_end_after' ] = $tmp;
						break;
					case 'search':
						if(!empty($tmp)) $queryArgs[ 's' ] = $tmp;
						break;
					case 'category':
						if(!empty($tmp)) $queryArgs[ 'tax_query' ] = [
							[
								'taxonomy' => 'event-category',
								'field'    => 'name',
								'terms'    => explode(',', $tmp),
							]
						];
						break;
					case 'categoryIds':
						if(!empty($tmp)) $queryArgs[ 'tax_query' ] = [
							[
								'taxonomy' => 'event-category',
								'field'    => 'term_id',
								'terms'    => explode(',', $tmp),
							]
						];
						break;
					case 'tag':
						if(!empty($tmp)) $queryArgs[ 'tax_query' ] = [
							[
								'taxonomy' => 'event-tag',
								'field'    => 'name',
								'terms'    => explode(',', $tmp),
							]
						];
						break;
					case 'tagIds':
						if(!empty($tmp)) $queryArgs[ 'tax_query' ] = [
							[
								'taxonomy' => 'event-tag',
								'field'    => 'term_id',
								'terms'    => explode(',', $tmp),
							]
						];
						break;
				}
			}

			// possibliity to modify the query args
			$queryArgs = apply_filters( 'eo_events_rest_api_query', $queryArgs, $request );

			$events = eo_get_events( $queryArgs );
			if ( $events ) {
				foreach ( $events as $event ) {
					$venue_id   = eo_get_venue( $event->ID );
					$venue_name = eo_get_venue_name( $venue_id );

					$result[] = self::enrichEventData($event);
				}
			}
			error_log(print_r($queryArgs, true));
			return $result;
		} catch ( Exception $e ) {
			return new WP_Error( 'error', $e->getMessage(), [ 'status' => 423 ] );
		}
	}

	public static function enrichEventData($event) {
		$thumbnailSize = apply_filters( 'eo_events_rest_api_thumbnail_size', 'thumbnail' );

		//fix native data format
		$event->event_title = $event->post_title;
		$event->event_startDate = $event->StartDate;
		$event->event_startTime = $event->StartTime;
		$event->event_endDate = $event->EndDate;
		$event->event_endTime = $event->FinishTime;
		$event->event_id = intval($event->event_id);
		$event->event_occurrence = intval($event->event_occurrence);
		$event->event_occurrence_id = intval($event->occurrence_id);

		$event->event_link = get_permalink($event->ID);
		$event->event_tax = wp_get_post_terms($event->ID, 'event-tag');
		$event->event_category = wp_get_post_terms($event->ID, 'event-category');
		$event->event_moreThanOneDay = eo_get_the_start('d.m.Y', $event->ID, $event->occurrence_id) !== eo_get_the_end('d.m.Y', $event->ID, $event->occurrence_id);
		$event->event_allDay = eo_is_all_day($event->ID);
		$event->event_thumbnail = get_the_post_thumbnail_url($event->ID, $thumbnailSize);
		$event->event_thumbnail_data = wp_get_attachment_image_src(get_post_thumbnail_id($event->ID), $thumbnailSize);
		$event->event_thumbnailId = get_post_thumbnail_id($event->ID);

		$venue_id = eo_get_venue( $event->ID );
		$latLng = eo_get_venue_latlng( $venue_id );
		$event->event_venue = (object)eo_get_venue_address($venue_id);
		$event->event_venue->id = $venue_id;
		$event->event_venue->name = eo_get_venue_name( $venue_id );
		if(!empty($latLng)) {
			$event->event_venue->latitude = floatval($latLng['lat']);
			$event->event_venue->longitude = floatval($latLng['lng']);
		}

		return apply_filters( 'eo_events_rest_api_enrich_event_data', $event);
	}
}

EoEventsRestAPI::init();