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   1  <?php
   2  /**
   3   * Administration: Community Events class.
   4   *
   5   * @package WordPress
   6   * @subpackage Administration
   7   * @since 4.8.0
   8   */
   9  
  10  /**
  11   * Class WP_Community_Events.
  12   *
  13   * A client for api.wordpress.org/events.
  14   *
  15   * @since 4.8.0
  16   */
  17  class WP_Community_Events {
  18      /**
  19       * ID for a WordPress user account.
  20       *
  21       * @since 4.8.0
  22       *
  23       * @var int
  24       */
  25      protected $user_id = 0;
  26  
  27      /**
  28       * Stores location data for the user.
  29       *
  30       * @since 4.8.0
  31       *
  32       * @var false|array
  33       */
  34      protected $user_location = false;
  35  
  36      /**
  37       * Constructor for WP_Community_Events.
  38       *
  39       * @since 4.8.0
  40       *
  41       * @param int        $user_id       WP user ID.
  42       * @param false|array $user_location {
  43       *     Stored location data for the user. false to pass no location.
  44       *
  45       *     @type string $description The name of the location
  46       *     @type string $latitude    The latitude in decimal degrees notation, without the degree
  47       *                               symbol. e.g.: 47.615200.
  48       *     @type string $longitude   The longitude in decimal degrees notation, without the degree
  49       *                               symbol. e.g.: -122.341100.
  50       *     @type string $country     The ISO 3166-1 alpha-2 country code. e.g.: BR
  51       * }
  52       */
  53  	public function __construct( $user_id, $user_location = false ) {
  54          $this->user_id       = absint( $user_id );
  55          $this->user_location = $user_location;
  56      }
  57  
  58      /**
  59       * Gets data about events near a particular location.
  60       *
  61       * Cached events will be immediately returned if the `user_location` property
  62       * is set for the current user, and cached events exist for that location.
  63       *
  64       * Otherwise, this method sends a request to the w.org Events API with location
  65       * data. The API will send back a recognized location based on the data, along
  66       * with nearby events.
  67       *
  68       * The browser's request for events is proxied with this method, rather
  69       * than having the browser make the request directly to api.wordpress.org,
  70       * because it allows results to be cached server-side and shared with other
  71       * users and sites in the network. This makes the process more efficient,
  72       * since increasing the number of visits that get cached data means users
  73       * don't have to wait as often; if the user's browser made the request
  74       * directly, it would also need to make a second request to WP in order to
  75       * pass the data for caching. Having WP make the request also introduces
  76       * the opportunity to anonymize the IP before sending it to w.org, which
  77       * mitigates possible privacy concerns.
  78       *
  79       * @since 4.8.0
  80       * @since 5.5.2 Response no longer contains formatted date field. They're added
  81       *              in `wp.communityEvents.populateDynamicEventFields()` now.
  82       *
  83       * @param string $location_search Optional. City name to help determine the location.
  84       *                                e.g., "Seattle". Default empty string.
  85       * @param string $timezone        Optional. Timezone to help determine the location.
  86       *                                Default empty string.
  87       * @return array|WP_Error A WP_Error on failure; an array with location and events on
  88       *                        success.
  89       */
  90  	public function get_events( $location_search = '', $timezone = '' ) {
  91          $cached_events = $this->get_cached_events();
  92  
  93          if ( ! $location_search && $cached_events ) {
  94              return $cached_events;
  95          }
  96  
  97          // Include an unmodified $wp_version.
  98          require  ABSPATH . WPINC . '/version.php';
  99  
 100          $api_url                    = 'http://api.wordpress.org/events/1.0/';
 101          $request_args               = $this->get_request_args( $location_search, $timezone );
 102          $request_args['user-agent'] = 'WordPress/' . $wp_version . '; ' . home_url( '/' );
 103  
 104          if ( wp_http_supports( array( 'ssl' ) ) ) {
 105              $api_url = set_url_scheme( $api_url, 'https' );
 106          }
 107  
 108          $response       = wp_remote_get( $api_url, $request_args );
 109          $response_code  = wp_remote_retrieve_response_code( $response );
 110          $response_body  = json_decode( wp_remote_retrieve_body( $response ), true );
 111          $response_error = null;
 112  
 113          if ( is_wp_error( $response ) ) {
 114              $response_error = $response;
 115          } elseif ( 200 !== $response_code ) {
 116              $response_error = new WP_Error(
 117                  'api-error',
 118                  /* translators: %d: Numeric HTTP status code, e.g. 400, 403, 500, 504, etc. */
 119                  sprintf( __( 'Invalid API response code (%d).' ), $response_code )
 120              );
 121          } elseif ( ! isset( $response_body['location'], $response_body['events'] ) ) {
 122              $response_error = new WP_Error(
 123                  'api-invalid-response',
 124                  isset( $response_body['error'] ) ? $response_body['error'] : __( 'Unknown API error.' )
 125              );
 126          }
 127  
 128          if ( is_wp_error( $response_error ) ) {
 129              return $response_error;
 130          } else {
 131              $expiration = false;
 132  
 133              if ( isset( $response_body['ttl'] ) ) {
 134                  $expiration = $response_body['ttl'];
 135                  unset( $response_body['ttl'] );
 136              }
 137  
 138              /*
 139               * The IP in the response is usually the same as the one that was sent
 140               * in the request, but in some cases it is different. In those cases,
 141               * it's important to reset it back to the IP from the request.
 142               *
 143               * For example, if the IP sent in the request is private (e.g., 192.168.1.100),
 144               * then the API will ignore that and use the corresponding public IP instead,
 145               * and the public IP will get returned. If the public IP were saved, though,
 146               * then get_cached_events() would always return `false`, because the transient
 147               * would be generated based on the public IP when saving the cache, but generated
 148               * based on the private IP when retrieving the cache.
 149               */
 150              if ( ! empty( $response_body['location']['ip'] ) ) {
 151                  $response_body['location']['ip'] = $request_args['body']['ip'];
 152              }
 153  
 154              /*
 155               * The API doesn't return a description for latitude/longitude requests,
 156               * but the description is already saved in the user location, so that
 157               * one can be used instead.
 158               */
 159              if ( $this->coordinates_match( $request_args['body'], $response_body['location'] ) && empty( $response_body['location']['description'] ) ) {
 160                  $response_body['location']['description'] = $this->user_location['description'];
 161              }
 162  
 163              /*
 164               * Store the raw response, because events will expire before the cache does.
 165               * The response will need to be processed every page load.
 166               */
 167              $this->cache_events( $response_body, $expiration );
 168  
 169              $response_body['events'] = $this->trim_events( $response_body['events'] );
 170  
 171              return $response_body;
 172          }
 173      }
 174  
 175      /**
 176       * Builds an array of args to use in an HTTP request to the w.org Events API.
 177       *
 178       * @since 4.8.0
 179       *
 180       * @param string $search   Optional. City search string. Default empty string.
 181       * @param string $timezone Optional. Timezone string. Default empty string.
 182       * @return array The request args.
 183       */
 184  	protected function get_request_args( $search = '', $timezone = '' ) {
 185          $args = array(
 186              'number' => 5, // Get more than three in case some get trimmed out.
 187              'ip'     => self::get_unsafe_client_ip(),
 188          );
 189  
 190          /*
 191           * Include the minimal set of necessary arguments, in order to increase the
 192           * chances of a cache-hit on the API side.
 193           */
 194          if ( empty( $search ) && isset( $this->user_location['latitude'], $this->user_location['longitude'] ) ) {
 195              $args['latitude']  = $this->user_location['latitude'];
 196              $args['longitude'] = $this->user_location['longitude'];
 197          } else {
 198              $args['locale'] = get_user_locale( $this->user_id );
 199  
 200              if ( $timezone ) {
 201                  $args['timezone'] = $timezone;
 202              }
 203  
 204              if ( $search ) {
 205                  $args['location'] = $search;
 206              }
 207          }
 208  
 209          // Wrap the args in an array compatible with the second parameter of `wp_remote_get()`.
 210          return array(
 211              'body' => $args,
 212          );
 213      }
 214  
 215      /**
 216       * Determines the user's actual IP address and attempts to partially
 217       * anonymize an IP address by converting it to a network ID.
 218       *
 219       * Geolocating the network ID usually returns a similar location as the
 220       * actual IP, but provides some privacy for the user.
 221       *
 222       * $_SERVER['REMOTE_ADDR'] cannot be used in all cases, such as when the user
 223       * is making their request through a proxy, or when the web server is behind
 224       * a proxy. In those cases, $_SERVER['REMOTE_ADDR'] is set to the proxy address rather
 225       * than the user's actual address.
 226       *
 227       * Modified from https://stackoverflow.com/a/2031935/450127, MIT license.
 228       * Modified from https://github.com/geertw/php-ip-anonymizer, MIT license.
 229       *
 230       * SECURITY WARNING: This function is _NOT_ intended to be used in
 231       * circumstances where the authenticity of the IP address matters. This does
 232       * _NOT_ guarantee that the returned address is valid or accurate, and it can
 233       * be easily spoofed.
 234       *
 235       * @since 4.8.0
 236       *
 237       * @return string|false The anonymized address on success; the given address
 238       *                      or false on failure.
 239       */
 240  	public static function get_unsafe_client_ip() {
 241          $client_ip = false;
 242  
 243          // In order of preference, with the best ones for this purpose first.
 244          $address_headers = array(
 245              'HTTP_CLIENT_IP',
 246              'HTTP_X_FORWARDED_FOR',
 247              'HTTP_X_FORWARDED',
 248              'HTTP_X_CLUSTER_CLIENT_IP',
 249              'HTTP_FORWARDED_FOR',
 250              'HTTP_FORWARDED',
 251              'REMOTE_ADDR',
 252          );
 253  
 254          foreach ( $address_headers as $header ) {
 255              if ( array_key_exists( $header, $_SERVER ) ) {
 256                  /*
 257                   * HTTP_X_FORWARDED_FOR can contain a chain of comma-separated
 258                   * addresses. The first one is the original client. It can't be
 259                   * trusted for authenticity, but we don't need to for this purpose.
 260                   */
 261                  $address_chain = explode( ',', $_SERVER[ $header ] );
 262                  $client_ip     = trim( $address_chain[0] );
 263  
 264                  break;
 265              }
 266          }
 267  
 268          if ( ! $client_ip ) {
 269              return false;
 270          }
 271  
 272          $anon_ip = wp_privacy_anonymize_ip( $client_ip, true );
 273  
 274          if ( '0.0.0.0' === $anon_ip || '::' === $anon_ip ) {
 275              return false;
 276          }
 277  
 278          return $anon_ip;
 279      }
 280  
 281      /**
 282       * Test if two pairs of latitude/longitude coordinates match each other.
 283       *
 284       * @since 4.8.0
 285       *
 286       * @param array $a The first pair, with indexes 'latitude' and 'longitude'.
 287       * @param array $b The second pair, with indexes 'latitude' and 'longitude'.
 288       * @return bool True if they match, false if they don't.
 289       */
 290  	protected function coordinates_match( $a, $b ) {
 291          if ( ! isset( $a['latitude'], $a['longitude'], $b['latitude'], $b['longitude'] ) ) {
 292              return false;
 293          }
 294  
 295          return $a['latitude'] === $b['latitude'] && $a['longitude'] === $b['longitude'];
 296      }
 297  
 298      /**
 299       * Generates a transient key based on user location.
 300       *
 301       * This could be reduced to a one-liner in the calling functions, but it's
 302       * intentionally a separate function because it's called from multiple
 303       * functions, and having it abstracted keeps the logic consistent and DRY,
 304       * which is less prone to errors.
 305       *
 306       * @since 4.8.0
 307       *
 308       * @param array $location Should contain 'latitude' and 'longitude' indexes.
 309       * @return string|false Transient key on success, false on failure.
 310       */
 311  	protected function get_events_transient_key( $location ) {
 312          $key = false;
 313  
 314          if ( isset( $location['ip'] ) ) {
 315              $key = 'community-events-' . md5( $location['ip'] );
 316          } elseif ( isset( $location['latitude'], $location['longitude'] ) ) {
 317              $key = 'community-events-' . md5( $location['latitude'] . $location['longitude'] );
 318          }
 319  
 320          return $key;
 321      }
 322  
 323      /**
 324       * Caches an array of events data from the Events API.
 325       *
 326       * @since 4.8.0
 327       *
 328       * @param array     $events     Response body from the API request.
 329       * @param int|false $expiration Optional. Amount of time to cache the events. Defaults to false.
 330       * @return bool true if events were cached; false if not.
 331       */
 332  	protected function cache_events( $events, $expiration = false ) {
 333          $set              = false;
 334          $transient_key    = $this->get_events_transient_key( $events['location'] );
 335          $cache_expiration = $expiration ? absint( $expiration ) : HOUR_IN_SECONDS * 12;
 336  
 337          if ( $transient_key ) {
 338              $set = set_site_transient( $transient_key, $events, $cache_expiration );
 339          }
 340  
 341          return $set;
 342      }
 343  
 344      /**
 345       * Gets cached events.
 346       *
 347       * @since 4.8.0
 348       * @since 5.5.2 Response no longer contains formatted date field. They're added
 349       *              in `wp.communityEvents.populateDynamicEventFields()` now.
 350       *
 351       * @return array|false An array containing `location` and `events` items
 352       *                     on success, false on failure.
 353       */
 354  	public function get_cached_events() {
 355          $cached_response = get_site_transient( $this->get_events_transient_key( $this->user_location ) );
 356  
 357          if ( isset( $cached_response['events'] ) ) {
 358              $cached_response['events'] = $this->trim_events( $cached_response['events'] );
 359          }
 360  
 361          return $cached_response;
 362      }
 363  
 364      /**
 365       * Adds formatted date and time items for each event in an API response.
 366       *
 367       * This has to be called after the data is pulled from the cache, because
 368       * the cached events are shared by all users. If it was called before storing
 369       * the cache, then all users would see the events in the localized data/time
 370       * of the user who triggered the cache refresh, rather than their own.
 371       *
 372       * @since 4.8.0
 373       * @deprecated 5.6.0 No longer used in core.
 374       *
 375       * @param array $response_body The response which contains the events.
 376       * @return array The response with dates and times formatted.
 377       */
 378  	protected function format_event_data_time( $response_body ) {
 379          _deprecated_function(
 380              __METHOD__,
 381              '5.5.2',
 382              'This is no longer used by core, and only kept for backward compatibility.'
 383          );
 384  
 385          if ( isset( $response_body['events'] ) ) {
 386              foreach ( $response_body['events'] as $key => $event ) {
 387                  $timestamp = strtotime( $event['date'] );
 388  
 389                  /*
 390                   * The `date_format` option is not used because it's important
 391                   * in this context to keep the day of the week in the formatted date,
 392                   * so that users can tell at a glance if the event is on a day they
 393                   * are available, without having to open the link.
 394                   */
 395                  /* translators: Date format for upcoming events on the dashboard. Include the day of the week. See https://www.php.net/manual/datetime.format.php */
 396                  $formatted_date = date_i18n( __( 'l, M j, Y' ), $timestamp );
 397                  $formatted_time = date_i18n( get_option( 'time_format' ), $timestamp );
 398  
 399                  if ( isset( $event['end_date'] ) ) {
 400                      $end_timestamp      = strtotime( $event['end_date'] );
 401                      $formatted_end_date = date_i18n( __( 'l, M j, Y' ), $end_timestamp );
 402  
 403                      if ( 'meetup' !== $event['type'] && $formatted_end_date !== $formatted_date ) {
 404                          /* translators: Upcoming events month format. See https://www.php.net/manual/datetime.format.php */
 405                          $start_month = date_i18n( _x( 'F', 'upcoming events month format' ), $timestamp );
 406                          $end_month   = date_i18n( _x( 'F', 'upcoming events month format' ), $end_timestamp );
 407  
 408                          if ( $start_month === $end_month ) {
 409                              $formatted_date = sprintf(
 410                                  /* translators: Date string for upcoming events. 1: Month, 2: Starting day, 3: Ending day, 4: Year. */
 411                                  __( '%1$s %2$d–%3$d, %4$d' ),
 412                                  $start_month,
 413                                  /* translators: Upcoming events day format. See https://www.php.net/manual/datetime.format.php */
 414                                  date_i18n( _x( 'j', 'upcoming events day format' ), $timestamp ),
 415                                  date_i18n( _x( 'j', 'upcoming events day format' ), $end_timestamp ),
 416                                  /* translators: Upcoming events year format. See https://www.php.net/manual/datetime.format.php */
 417                                  date_i18n( _x( 'Y', 'upcoming events year format' ), $timestamp )
 418                              );
 419                          } else {
 420                              $formatted_date = sprintf(
 421                                  /* translators: Date string for upcoming events. 1: Starting month, 2: Starting day, 3: Ending month, 4: Ending day, 5: Year. */
 422                                  __( '%1$s %2$d – %3$s %4$d, %5$d' ),
 423                                  $start_month,
 424                                  date_i18n( _x( 'j', 'upcoming events day format' ), $timestamp ),
 425                                  $end_month,
 426                                  date_i18n( _x( 'j', 'upcoming events day format' ), $end_timestamp ),
 427                                  date_i18n( _x( 'Y', 'upcoming events year format' ), $timestamp )
 428                              );
 429                          }
 430  
 431                          $formatted_date = wp_maybe_decline_date( $formatted_date, 'F j, Y' );
 432                      }
 433                  }
 434  
 435                  $response_body['events'][ $key ]['formatted_date'] = $formatted_date;
 436                  $response_body['events'][ $key ]['formatted_time'] = $formatted_time;
 437              }
 438          }
 439  
 440          return $response_body;
 441      }
 442  
 443      /**
 444       * Prepares the event list for presentation.
 445       *
 446       * Discards expired events, and makes WordCamps "sticky." Attendees need more
 447       * advanced notice about WordCamps than they do for meetups, so camps should
 448       * appear in the list sooner. If a WordCamp is coming up, the API will "stick"
 449       * it in the response, even if it wouldn't otherwise appear. When that happens,
 450       * the event will be at the end of the list, and will need to be moved into a
 451       * higher position, so that it doesn't get trimmed off.
 452       *
 453       * @since 4.8.0
 454       * @since 4.9.7 Stick a WordCamp to the final list.
 455       * @since 5.5.2 Accepts and returns only the events, rather than an entire HTTP response.
 456       * @since 6.0.0 Decode HTML entities from the event title.
 457       *
 458       * @param array $events The events that will be prepared.
 459       * @return array The response body with events trimmed.
 460       */
 461  	protected function trim_events( array $events ) {
 462          $future_events = array();
 463  
 464          foreach ( $events as $event ) {
 465              /*
 466               * The API's `date` and `end_date` fields are in the _event's_ local timezone, but UTC is needed so
 467               * it can be converted to the _user's_ local time.
 468               */
 469              $end_time = (int) $event['end_unix_timestamp'];
 470  
 471              if ( time() < $end_time ) {
 472                  // Decode HTML entities from the event title.
 473                  $event['title'] = html_entity_decode( $event['title'], ENT_QUOTES, 'UTF-8' );
 474  
 475                  array_push( $future_events, $event );
 476              }
 477          }
 478  
 479          $future_wordcamps = array_filter(
 480              $future_events,
 481              static function( $wordcamp ) {
 482                  return 'wordcamp' === $wordcamp['type'];
 483              }
 484          );
 485  
 486          $future_wordcamps    = array_values( $future_wordcamps ); // Remove gaps in indices.
 487          $trimmed_events      = array_slice( $future_events, 0, 3 );
 488          $trimmed_event_types = wp_list_pluck( $trimmed_events, 'type' );
 489  
 490          // Make sure the soonest upcoming WordCamp is pinned in the list.
 491          if ( $future_wordcamps && ! in_array( 'wordcamp', $trimmed_event_types, true ) ) {
 492              array_pop( $trimmed_events );
 493              array_push( $trimmed_events, $future_wordcamps[0] );
 494          }
 495  
 496          return $trimmed_events;
 497      }
 498  
 499      /**
 500       * Logs responses to Events API requests.
 501       *
 502       * @since 4.8.0
 503       * @deprecated 4.9.0 Use a plugin instead. See #41217 for an example.
 504       *
 505       * @param string $message A description of what occurred.
 506       * @param array  $details Details that provide more context for the
 507       *                        log entry.
 508       */
 509  	protected function maybe_log_events_response( $message, $details ) {
 510          _deprecated_function( __METHOD__, '4.9.0' );
 511  
 512          if ( ! WP_DEBUG_LOG ) {
 513              return;
 514          }
 515  
 516          error_log(
 517              sprintf(
 518                  '%s: %s. Details: %s',
 519                  __METHOD__,
 520                  trim( $message, '.' ),
 521                  wp_json_encode( $details )
 522              )
 523          );
 524      }
 525  }