radar-wp/includes/squat-radar-connector.php

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<?php
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/**
* Squat Radar Connector.
*
* Fetch data from Radar API.
*
* @package squat-radar
* @since 2.0.0
*/
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// Exit if accessed directly.
defined( 'ABSPATH' ) || exit;
class Squat_Radar_Connector {
const BASE_URL = 'https://radar.squat.net';
const API_EVENTS = '/api/1.2/search/events.json';
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/**
* Retrieve array of events from API based on a query.
*
* @see self::encode_api_query() for $query values.
*
* @param array $query
* Key value pairs for the API query.
*
* @return array
* Array of events.
*
* @throws Squat_Radar_Connector_Exception
* When events are not returned, but a timeout or API error.
*/
function get_events( $query ) {
$url = self::BASE_URL . self::API_EVENTS . '?' . build_query( $query );
$response = wp_remote_get( $url );
if ( is_wp_error( $response ) ) {
throw new Squat_Radar_Connector_Exception( $response->get_error_message() );
}
$code = wp_remote_retrieve_response_code( $response );
if ( $code != 200) {
throw new Squat_Radar_Connector_Exception( wp_remote_retrieve_body( $response ), $code );
}
return json_decode( wp_remote_retrieve_body( $response ), true);
}
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/**
* Turn a Radar frontend Search URL into facets key value and language values.
*
* @param string $url
* The https://radar.squat.net/events filtered URL.
*
* @return array
* [ 'language' => language code, 'facets' => [key => value] ].
*/
function decode_search_url( $url ) {
$matches = [];
$result = [];
// Urldecode not required here because of the regex match.
// Radar paramaters here are transcoded so will match.
if (preg_match('|//radar.squat.net/([a-z]{2})/events/([a-zA-Z0-9/]*)|', $url, $matches)) {
$result['language'] = $matches[1];
foreach (array_chunk(explode('/', $matches[2]), 2) as $key_value_pair) {
$result['facets'][$key_value_pair[0]] = $key_value_pair[1];
}
}
return $result;
}
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/**
* Encode a query key value from facets, fields, language, limit.
*
* @param array $facets
* Optional. Facet key => filter value array.
* @param array $fields
* Optional. Index array of API field names to retrieve.
* @param string $language
* Optional. Language code.
* @param int $limit
* Optional. Maximum number to items to return.
*
* @return array
* Array for use in self::get_events().
*/
function encode_api_query( $facets = [], $fields = [], $language = '', $limit = 10 ) {
$query = [];
// Urlencode should do nothing here @see comment in decode_search_url.
// If someone has snuck something in it will however help.
foreach ( $facets as $key => $value ) {
$query[] = ['facets[' . urlencode($key) . '][]' => urlencode($value)];
}
if ( ! empty($fields) ) {
// {raw}urlencode is encoding : and , both of which are valid pchar.
$query['fields'] = preg_replace('/[^a-z_:,]/', '', implode(',', $fields));
}
if ( ! empty($language) ) {
$query['language'] = urlencode($language);
}
if ( ! empty($limit) ) {
$query['limit'] = urlencode($limit);
}
return $query;
}
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/**
* Return events meeting argument criteria. Either from cache, or retrieved from API.
*
* @param array $facets
* Facet name key => filter value.
* @param array $fields
* Optional. Array of key names.
* @param string $language
* Optional. Language code.
* @param int $limit
* Maximum number of items to return.
* @param int $expiration
* Seconds to cache results. 0 never expires.
* @param bool $reset
* Force a cache reset.
*
* @return array
* Array of event arrays, values keyed by field name.
*/
function events( $facets, $fields = [], $language = NULL, $limit = 10, $expiration = 10800, $reset = FALSE ) {
// Fields we often want to get data out of but not necessarily are chosen to be shown.
$fields = array_merge($fields, ['uuid', 'title', 'body:value', 'url', 'event_status']);
$transient_key = 'squat_radar_events_' . sha1(implode($facets) . implode($fields) . $language . $limit);
if (! $reset && $data = get_transient( $transient_key )) {
return $data;
}
$query = $this->encode_api_query( $facets, $fields, $language, $limit );
$events = $this->get_events($query);
set_transient( $transient_key, $events, $expiration );
return $events;
}
}
class Squat_Radar_Connector_Exception extends Exception { }