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<?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();
$today = current_time( 'Y-m-d' );
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;
}
// We don't get accurate time with timezone from API, so we only take the date part (Y-m-d).
$event_date = substr( $event['date'], 0, 10 );
if ( $today > $event_date ) {
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 )
)
);
}
}