name : class-wp-community-events.php <?php /** * Administration: Community Events class. * * @package WordPress * @subpackage Administration * @since 4.8.0 */ /** * Class WP_Community_Events. * * A client for api.wordpress.org/events. * * @since 4.8.0 */ class WP_Community_Events { /** * ID for a WordPress user account. * * @since 4.8.0 * * @var int */ protected $user_id = 0; /** * Stores location data for the user. * * @since 4.8.0 * * @var bool|array */ protected $user_location = false; /** * Constructor for WP_Community_Events. * * @since 4.8.0 * * @param int $user_id WP user ID. * @param bool|array $user_location Stored location data for the user. * false to pass no location; * array to pass a location { * @type string $description The name of the location * @type string $latitude The latitude in decimal degrees notation, without the degree * symbol. e.g.: 47.615200. * @type string $longitude The longitude in decimal degrees notation, without the degree * symbol. e.g.: -122.341100. * @type string $country The ISO 3166-1 alpha-2 country code. e.g.: BR * } */ public function __construct( $user_id, $user_location = false ) { $this->user_id = absint( $user_id ); $this->user_location = $user_location; } /** * Gets data about events near a particular location. * * Cached events will be immediately returned if the `user_location` property * is set for the current user, and cached events exist for that location. * * Otherwise, this method sends a request to the w.org Events API with location * data. The API will send back a recognized location based on the data, along * with nearby events. * * The browser's request for events is proxied with this method, rather * than having the browser make the request directly to api.wordpress.org, * because it allows results to be cached server-side and shared with other * users and sites in the network. This makes the process more efficient, * since increasing the number of visits that get cached data means users * don't have to wait as often; if the user's browser made the request * directly, it would also need to make a second request to WP in order to * pass the data for caching. Having WP make the request also introduces * the opportunity to anonymize the IP before sending it to w.org, which * mitigates possible privacy concerns. * * @since 4.8.0 * * @param string $location_search Optional. City name to help determine the location. * e.g., "Seattle". Default empty string. * @param string $timezone Optional. Timezone to help determine the location. * Default empty string. * @return array|WP_Error A WP_Error on failure; an array with location and events on * success. */ public function get_events( $location_search = '', $timezone = '' ) { $cached_events = $this->get_cached_events(); if ( ! $location_search && $cached_events ) { return $cached_events; } // include an unmodified $wp_version include( ABSPATH . WPINC . '/version.php' ); $api_url = 'http://api.wordpress.org/events/1.0/'; $request_args = $this->get_request_args( $location_search, $timezone ); $request_args['user-agent'] = 'WordPress/' . $wp_version . '; ' . home_url( '/' ); if ( wp_http_supports( array( 'ssl' ) ) ) { $api_url = set_url_scheme( $api_url, 'https' ); } $response = wp_remote_get( $api_url, $request_args ); $response_code = wp_remote_retrieve_response_code( $response ); $response_body = json_decode( wp_remote_retrieve_body( $response ), true ); $response_error = null; if ( is_wp_error( $response ) ) { $response_error = $response; } elseif ( 200 !== $response_code ) { $response_error = new WP_Error( 'api-error', /* translators: %d: numeric HTTP status code, e.g. 400, 403, 500, 504, etc. */ sprintf( __( 'Invalid API response code (%d)' ), $response_code ) ); } elseif ( ! isset( $response_body['location'], $response_body['events'] ) ) { $response_error = new WP_Error( 'api-invalid-response', isset( $response_body['error'] ) ? $response_body['error'] : __( 'Unknown API error.' ) ); } if ( is_wp_error( $response_error ) ) { return $response_error; } else { $expiration = false; if ( isset( $response_body['ttl'] ) ) { $expiration = $response_body['ttl']; unset( $response_body['ttl'] ); } /* * The IP in the response is usually the same as the one that was sent * in the request, but in some cases it is different. In those cases, * it's important to reset it back to the IP from the request. * * For example, if the IP sent in the request is private (e.g., 192.168.1.100), * then the API will ignore that and use the corresponding public IP instead, * and the public IP will get returned. If the public IP were saved, though, * then get_cached_events() would always return `false`, because the transient * would be generated based on the public IP when saving the cache, but generated * based on the private IP when retrieving the cache. */ if ( ! empty( $response_body['location']['ip'] ) ) { $response_body['location']['ip'] = $request_args['body']['ip']; } /* * The API doesn't return a description for latitude/longitude requests, * but the description is already saved in the user location, so that * one can be used instead. */ if ( $this->coordinates_match( $request_args['body'], $response_body['location'] ) && empty( $response_body['location']['description'] ) ) { $response_body['location']['description'] = $this->user_location['description']; } $this->cache_events( $response_body, $expiration ); $response_body = $this->trim_events( $response_body ); $response_body = $this->format_event_data_time( $response_body ); return $response_body; } } /** * Builds an array of args to use in an HTTP request to the w.org Events API. * * @since 4.8.0 * * @param string $search Optional. City search string. Default empty string. * @param string $timezone Optional. Timezone string. Default empty string. * @return array The request args. */ protected function get_request_args( $search = '', $timezone = '' ) { $args = array( 'number' => 5, // Get more than three in case some get trimmed out. 'ip' => self::get_unsafe_client_ip(), ); /* * Include the minimal set of necessary arguments, in order to increase the * chances of a cache-hit on the API side. */ if ( empty( $search ) && isset( $this->user_location['latitude'], $this->user_location['longitude'] ) ) { $args['latitude'] = $this->user_location['latitude']; $args['longitude'] = $this->user_location['longitude']; } else { $args['locale'] = get_user_locale( $this->user_id ); if ( $timezone ) { $args['timezone'] = $timezone; } if ( $search ) { $args['location'] = $search; } } // Wrap the args in an array compatible with the second parameter of `wp_remote_get()`. return array( 'body' => $args, ); } /** * Determines the user's actual IP address and attempts to partially * anonymize an IP address by converting it to a network ID. * * Geolocating the network ID usually returns a similar location as the * actual IP, but provides some privacy for the user. * * $_SERVER['REMOTE_ADDR'] cannot be used in all cases, such as when the user * is making their request through a proxy, or when the web server is behind * a proxy. In those cases, $_SERVER['REMOTE_ADDR'] is set to the proxy address rather * than the user's actual address. * * Modified from https://stackoverflow.com/a/2031935/450127, MIT license. * Modified from https://github.com/geertw/php-ip-anonymizer, MIT license. * * SECURITY WARNING: This function is _NOT_ intended to be used in * circumstances where the authenticity of the IP address matters. This does * _NOT_ guarantee that the returned address is valid or accurate, and it can * be easily spoofed. * * @since 4.8.0 * * @return false|string The anonymized address on success; the given address * or false on failure. */ public static function get_unsafe_client_ip() { $client_ip = false; // In order of preference, with the best ones for this purpose first. $address_headers = array( 'HTTP_CLIENT_IP', 'HTTP_X_FORWARDED_FOR', 'HTTP_X_FORWARDED', 'HTTP_X_CLUSTER_CLIENT_IP', 'HTTP_FORWARDED_FOR', 'HTTP_FORWARDED', 'REMOTE_ADDR', ); foreach ( $address_headers as $header ) { if ( array_key_exists( $header, $_SERVER ) ) { /* * HTTP_X_FORWARDED_FOR can contain a chain of comma-separated * addresses. The first one is the original client. It can't be * trusted for authenticity, but we don't need to for this purpose. */ $address_chain = explode( ',', $_SERVER[ $header ] ); $client_ip = trim( $address_chain[0] ); break; } } if ( ! $client_ip ) { return false; } $anon_ip = wp_privacy_anonymize_ip( $client_ip, true ); if ( '0.0.0.0' === $anon_ip || '::' === $anon_ip ) { return false; } return $anon_ip; } /** * Test if two pairs of latitude/longitude coordinates match each other. * * @since 4.8.0 * * @param array $a The first pair, with indexes 'latitude' and 'longitude'. * @param array $b The second pair, with indexes 'latitude' and 'longitude'. * @return bool True if they match, false if they don't. */ protected function coordinates_match( $a, $b ) { if ( ! isset( $a['latitude'], $a['longitude'], $b['latitude'], $b['longitude'] ) ) { return false; } return $a['latitude'] === $b['latitude'] && $a['longitude'] === $b['longitude']; } /** * Generates a transient key based on user location. * * This could be reduced to a one-liner in the calling functions, but it's * intentionally a separate function because it's called from multiple * functions, and having it abstracted keeps the logic consistent and DRY, * which is less prone to errors. * * @since 4.8.0 * * @param array $location Should contain 'latitude' and 'longitude' indexes. * @return bool|string false on failure, or a string on success. */ protected function get_events_transient_key( $location ) { $key = false; if ( isset( $location['ip'] ) ) { $key = 'community-events-' . md5( $location['ip'] ); } elseif ( isset( $location['latitude'], $location['longitude'] ) ) { $key = 'community-events-' . md5( $location['latitude'] . $location['longitude'] ); } return $key; } /** * Caches an array of events data from the Events API. * * @since 4.8.0 * * @param array $events Response body from the API request. * @param int|bool $expiration Optional. Amount of time to cache the events. Defaults to false. * @return bool true if events were cached; false if not. */ protected function cache_events( $events, $expiration = false ) { $set = false; $transient_key = $this->get_events_transient_key( $events['location'] ); $cache_expiration = $expiration ? absint( $expiration ) : HOUR_IN_SECONDS * 12; if ( $transient_key ) { $set = set_site_transient( $transient_key, $events, $cache_expiration ); } return $set; } /** * Gets cached events. * * @since 4.8.0 * * @return false|array false on failure; an array containing `location` * and `events` items on success. */ public function get_cached_events() { $cached_response = get_site_transient( $this->get_events_transient_key( $this->user_location ) ); $cached_response = $this->trim_events( $cached_response ); return $this->format_event_data_time( $cached_response ); } /** * Adds formatted date and time items for each event in an API response. * * This has to be called after the data is pulled from the cache, because * the cached events are shared by all users. If it was called before storing * the cache, then all users would see the events in the localized data/time * of the user who triggered the cache refresh, rather than their own. * * @since 4.8.0 * * @param array $response_body The response which contains the events. * @return array The response with dates and times formatted. */ protected function format_event_data_time( $response_body ) { if ( isset( $response_body['events'] ) ) { foreach ( $response_body['events'] as $key => $event ) { $timestamp = strtotime( $event['date'] ); /* * The `date_format` option is not used because it's important * in this context to keep the day of the week in the formatted date, * so that users can tell at a glance if the event is on a day they * are available, without having to open the link. */ /* translators: Date format for upcoming events on the dashboard. Include the day of the week. See https://secure.php.net/date. */ $response_body['events'][ $key ]['formatted_date'] = date_i18n( __( 'l, M j, Y' ), $timestamp ); $response_body['events'][ $key ]['formatted_time'] = date_i18n( get_option( 'time_format' ), $timestamp ); } } return $response_body; } /** * Prepares the event list for presentation. * * Discards expired events, and makes WordCamps "sticky." Attendees need more * advanced notice about WordCamps than they do for meetups, so camps should * appear in the list sooner. If a WordCamp is coming up, the API will "stick" * it in the response, even if it wouldn't otherwise appear. When that happens, * the event will be at the end of the list, and will need to be moved into a * higher position, so that it doesn't get trimmed off. * * @since 4.8.0 * @since 4.9.7 Stick a WordCamp to the final list. * * @param array $response_body The response body which contains the events. * @return array The response body with events trimmed. */ protected function trim_events( $response_body ) { if ( isset( $response_body['events'] ) ) { $wordcamps = array(); $current_timestamp = current_time( 'timestamp' ); foreach ( $response_body['events'] as $key => $event ) { /* * Skip WordCamps, because they might be multi-day events. * Save a copy so they can be pinned later. */ if ( 'wordcamp' === $event['type'] ) { $wordcamps[] = $event; continue; } $event_timestamp = strtotime( $event['date'] ); if ( $current_timestamp > $event_timestamp && ( $current_timestamp - $event_timestamp ) > DAY_IN_SECONDS ) { unset( $response_body['events'][ $key ] ); } } $response_body['events'] = array_slice( $response_body['events'], 0, 3 ); $trimmed_event_types = wp_list_pluck( $response_body['events'], 'type' ); // Make sure the soonest upcoming WordCamp is pinned in the list. if ( ! in_array( 'wordcamp', $trimmed_event_types ) && $wordcamps ) { array_pop( $response_body['events'] ); array_push( $response_body['events'], $wordcamps[0] ); } } return $response_body; } /** * Logs responses to Events API requests. * * @since 4.8.0 * @deprecated 4.9.0 Use a plugin instead. See #41217 for an example. * * @param string $message A description of what occurred. * @param array $details Details that provide more context for the * log entry. */ protected function maybe_log_events_response( $message, $details ) { _deprecated_function( __METHOD__, '4.9.0' ); if ( ! WP_DEBUG_LOG ) { return; } error_log( sprintf( '%s: %s. Details: %s', __METHOD__, trim( $message, '.' ), wp_json_encode( $details ) ) ); } }