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   1  <?php
   2  /**
   3   * Link/Bookmark API
   4   *
   5   * @package WordPress
   6   * @subpackage Bookmark
   7   */
   8  
   9  /**
  10   * Retrieve Bookmark data
  11   *
  12   * @since 2.1.0
  13   *
  14   * @global wpdb $wpdb WordPress database abstraction object.
  15   *
  16   * @param int|stdClass $bookmark
  17   * @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
  18   *                       an stdClass object, an associative array, or a numeric array, respectively. Default OBJECT.
  19   * @param string $filter Optional. How to sanitize bookmark fields. Default 'raw'.
  20   * @return array|object|null Type returned depends on $output value.
  21   */
  22  function get_bookmark( $bookmark, $output = OBJECT, $filter = 'raw' ) {
  23      global $wpdb;
  24  
  25      if ( empty( $bookmark ) ) {
  26          if ( isset( $GLOBALS['link'] ) ) {
  27              $_bookmark = & $GLOBALS['link'];
  28          } else {
  29              $_bookmark = null;
  30          }
  31      } elseif ( is_object( $bookmark ) ) {
  32          wp_cache_add( $bookmark->link_id, $bookmark, 'bookmark' );
  33          $_bookmark = $bookmark;
  34      } else {
  35          if ( isset( $GLOBALS['link'] ) && ( $GLOBALS['link']->link_id == $bookmark ) ) {
  36              $_bookmark = & $GLOBALS['link'];
  37          } else {
  38              $_bookmark = wp_cache_get( $bookmark, 'bookmark' );
  39              if ( ! $_bookmark ) {
  40                  $_bookmark = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->links WHERE link_id = %d LIMIT 1", $bookmark ) );
  41                  if ( $_bookmark ) {
  42                      $_bookmark->link_category = array_unique( wp_get_object_terms( $_bookmark->link_id, 'link_category', array( 'fields' => 'ids' ) ) );
  43                      wp_cache_add( $_bookmark->link_id, $_bookmark, 'bookmark' );
  44                  }
  45              }
  46          }
  47      }
  48  
  49      if ( ! $_bookmark ) {
  50          return $_bookmark;
  51      }
  52  
  53      $_bookmark = sanitize_bookmark( $_bookmark, $filter );
  54  
  55      if ( OBJECT == $output ) {
  56          return $_bookmark;
  57      } elseif ( ARRAY_A == $output ) {
  58          return get_object_vars( $_bookmark );
  59      } elseif ( ARRAY_N == $output ) {
  60          return array_values( get_object_vars( $_bookmark ) );
  61      } else {
  62          return $_bookmark;
  63      }
  64  }
  65  
  66  /**
  67   * Retrieve single bookmark data item or field.
  68   *
  69   * @since 2.3.0
  70   *
  71   * @param string $field The name of the data field to return
  72   * @param int $bookmark The bookmark ID to get field
  73   * @param string $context Optional. The context of how the field will be used.
  74   * @return string|WP_Error
  75   */
  76  function get_bookmark_field( $field, $bookmark, $context = 'display' ) {
  77      $bookmark = (int) $bookmark;
  78      $bookmark = get_bookmark( $bookmark );
  79  
  80      if ( is_wp_error( $bookmark ) ) {
  81          return $bookmark;
  82      }
  83  
  84      if ( ! is_object( $bookmark ) ) {
  85          return '';
  86      }
  87  
  88      if ( ! isset( $bookmark->$field ) ) {
  89          return '';
  90      }
  91  
  92      return sanitize_bookmark_field( $field, $bookmark->$field, $bookmark->link_id, $context );
  93  }
  94  
  95  /**
  96   * Retrieves the list of bookmarks
  97   *
  98   * Attempts to retrieve from the cache first based on MD5 hash of arguments. If
  99   * that fails, then the query will be built from the arguments and executed. The
 100   * results will be stored to the cache.
 101   *
 102   * @since 2.1.0
 103   *
 104   * @global wpdb $wpdb WordPress database abstraction object.
 105   *
 106   * @param string|array $args {
 107   *     Optional. String or array of arguments to retrieve bookmarks.
 108   *
 109   *     @type string   $orderby        How to order the links by. Accepts 'id', 'link_id', 'name', 'link_name',
 110   *                                    'url', 'link_url', 'visible', 'link_visible', 'rating', 'link_rating',
 111   *                                    'owner', 'link_owner', 'updated', 'link_updated', 'notes', 'link_notes',
 112   *                                    'description', 'link_description', 'length' and 'rand'.
 113   *                                    When `$orderby` is 'length', orders by the character length of
 114   *                                    'link_name'. Default 'name'.
 115   *     @type string   $order          Whether to order bookmarks in ascending or descending order.
 116   *                                    Accepts 'ASC' (ascending) or 'DESC' (descending). Default 'ASC'.
 117   *     @type int      $limit          Amount of bookmarks to display. Accepts any positive number or
 118   *                                    -1 for all.  Default -1.
 119   *     @type string   $category       Comma-separated list of category IDs to include links from.
 120   *                                    Default empty.
 121   *     @type string   $category_name  Category to retrieve links for by name. Default empty.
 122   *     @type int|bool $hide_invisible Whether to show or hide links marked as 'invisible'. Accepts
 123   *                                    1|true or 0|false. Default 1|true.
 124   *     @type int|bool $show_updated   Whether to display the time the bookmark was last updated.
 125   *                                    Accepts 1|true or 0|false. Default 0|false.
 126   *     @type string   $include        Comma-separated list of bookmark IDs to include. Default empty.
 127   *     @type string   $exclude        Comma-separated list of bookmark IDs to exclude. Default empty.
 128   *     @type string   $search         Search terms. Will be SQL-formatted with wildcards before and after
 129   *                                    and searched in 'link_url', 'link_name' and 'link_description'.
 130   *                                    Default empty.
 131   * }
 132   * @return object[] List of bookmark row objects.
 133   */
 134  function get_bookmarks( $args = '' ) {
 135      global $wpdb;
 136  
 137      $defaults = array(
 138          'orderby'        => 'name',
 139          'order'          => 'ASC',
 140          'limit'          => -1,
 141          'category'       => '',
 142          'category_name'  => '',
 143          'hide_invisible' => 1,
 144          'show_updated'   => 0,
 145          'include'        => '',
 146          'exclude'        => '',
 147          'search'         => '',
 148      );
 149  
 150      $parsed_args = wp_parse_args( $args, $defaults );
 151  
 152      $key   = md5( serialize( $parsed_args ) );
 153      $cache = wp_cache_get( 'get_bookmarks', 'bookmark' );
 154  
 155      if ( 'rand' !== $parsed_args['orderby'] && $cache ) {
 156          if ( is_array( $cache ) && isset( $cache[ $key ] ) ) {
 157              $bookmarks = $cache[ $key ];
 158              /**
 159               * Filters the returned list of bookmarks.
 160               *
 161               * The first time the hook is evaluated in this file, it returns the cached
 162               * bookmarks list. The second evaluation returns a cached bookmarks list if the
 163               * link category is passed but does not exist. The third evaluation returns
 164               * the full cached results.
 165               *
 166               * @since 2.1.0
 167               *
 168               * @see get_bookmarks()
 169               *
 170               * @param array $bookmarks   List of the cached bookmarks.
 171               * @param array $parsed_args An array of bookmark query arguments.
 172               */
 173              return apply_filters( 'get_bookmarks', $bookmarks, $parsed_args );
 174          }
 175      }
 176  
 177      if ( ! is_array( $cache ) ) {
 178          $cache = array();
 179      }
 180  
 181      $inclusions = '';
 182      if ( ! empty( $parsed_args['include'] ) ) {
 183          $parsed_args['exclude']       = '';  // Ignore exclude, category, and category_name params if using include.
 184          $parsed_args['category']      = '';
 185          $parsed_args['category_name'] = '';
 186  
 187          $inclinks = wp_parse_id_list( $parsed_args['include'] );
 188          if ( count( $inclinks ) ) {
 189              foreach ( $inclinks as $inclink ) {
 190                  if ( empty( $inclusions ) ) {
 191                      $inclusions = ' AND ( link_id = ' . $inclink . ' ';
 192                  } else {
 193                      $inclusions .= ' OR link_id = ' . $inclink . ' ';
 194                  }
 195              }
 196          }
 197      }
 198      if ( ! empty( $inclusions ) ) {
 199          $inclusions .= ')';
 200      }
 201  
 202      $exclusions = '';
 203      if ( ! empty( $parsed_args['exclude'] ) ) {
 204          $exlinks = wp_parse_id_list( $parsed_args['exclude'] );
 205          if ( count( $exlinks ) ) {
 206              foreach ( $exlinks as $exlink ) {
 207                  if ( empty( $exclusions ) ) {
 208                      $exclusions = ' AND ( link_id <> ' . $exlink . ' ';
 209                  } else {
 210                      $exclusions .= ' AND link_id <> ' . $exlink . ' ';
 211                  }
 212              }
 213          }
 214      }
 215      if ( ! empty( $exclusions ) ) {
 216          $exclusions .= ')';
 217      }
 218  
 219      if ( ! empty( $parsed_args['category_name'] ) ) {
 220          $parsed_args['category'] = get_term_by( 'name', $parsed_args['category_name'], 'link_category' );
 221          if ( $parsed_args['category'] ) {
 222              $parsed_args['category'] = $parsed_args['category']->term_id;
 223          } else {
 224              $cache[ $key ] = array();
 225              wp_cache_set( 'get_bookmarks', $cache, 'bookmark' );
 226              /** This filter is documented in wp-includes/bookmark.php */
 227              return apply_filters( 'get_bookmarks', array(), $parsed_args );
 228          }
 229      }
 230  
 231      $search = '';
 232      if ( ! empty( $parsed_args['search'] ) ) {
 233          $like   = '%' . $wpdb->esc_like( $parsed_args['search'] ) . '%';
 234          $search = $wpdb->prepare( ' AND ( (link_url LIKE %s) OR (link_name LIKE %s) OR (link_description LIKE %s) ) ', $like, $like, $like );
 235      }
 236  
 237      $category_query = '';
 238      $join           = '';
 239      if ( ! empty( $parsed_args['category'] ) ) {
 240          $incategories = wp_parse_id_list( $parsed_args['category'] );
 241          if ( count( $incategories ) ) {
 242              foreach ( $incategories as $incat ) {
 243                  if ( empty( $category_query ) ) {
 244                      $category_query = ' AND ( tt.term_id = ' . $incat . ' ';
 245                  } else {
 246                      $category_query .= ' OR tt.term_id = ' . $incat . ' ';
 247                  }
 248              }
 249          }
 250      }
 251      if ( ! empty( $category_query ) ) {
 252          $category_query .= ") AND taxonomy = 'link_category'";
 253          $join            = " INNER JOIN $wpdb->term_relationships AS tr ON ($wpdb->links.link_id = tr.object_id) INNER JOIN $wpdb->term_taxonomy as tt ON tt.term_taxonomy_id = tr.term_taxonomy_id";
 254      }
 255  
 256      if ( $parsed_args['show_updated'] ) {
 257          $recently_updated_test = ', IF (DATE_ADD(link_updated, INTERVAL 120 MINUTE) >= NOW(), 1,0) as recently_updated ';
 258      } else {
 259          $recently_updated_test = '';
 260      }
 261  
 262      $get_updated = ( $parsed_args['show_updated'] ) ? ', UNIX_TIMESTAMP(link_updated) AS link_updated_f ' : '';
 263  
 264      $orderby = strtolower( $parsed_args['orderby'] );
 265      $length  = '';
 266      switch ( $orderby ) {
 267          case 'length':
 268              $length = ', CHAR_LENGTH(link_name) AS length';
 269              break;
 270          case 'rand':
 271              $orderby = 'rand()';
 272              break;
 273          case 'link_id':
 274              $orderby = "$wpdb->links.link_id";
 275              break;
 276          default:
 277              $orderparams = array();
 278              $keys        = array( 'link_id', 'link_name', 'link_url', 'link_visible', 'link_rating', 'link_owner', 'link_updated', 'link_notes', 'link_description' );
 279              foreach ( explode( ',', $orderby ) as $ordparam ) {
 280                  $ordparam = trim( $ordparam );
 281  
 282                  if ( in_array( 'link_' . $ordparam, $keys, true ) ) {
 283                      $orderparams[] = 'link_' . $ordparam;
 284                  } elseif ( in_array( $ordparam, $keys, true ) ) {
 285                      $orderparams[] = $ordparam;
 286                  }
 287              }
 288              $orderby = implode( ',', $orderparams );
 289      }
 290  
 291      if ( empty( $orderby ) ) {
 292          $orderby = 'link_name';
 293      }
 294  
 295      $order = strtoupper( $parsed_args['order'] );
 296      if ( '' !== $order && ! in_array( $order, array( 'ASC', 'DESC' ), true ) ) {
 297          $order = 'ASC';
 298      }
 299  
 300      $visible = '';
 301      if ( $parsed_args['hide_invisible'] ) {
 302          $visible = "AND link_visible = 'Y'";
 303      }
 304  
 305      $query  = "SELECT * $length $recently_updated_test $get_updated FROM $wpdb->links $join WHERE 1=1 $visible $category_query";
 306      $query .= " $exclusions $inclusions $search";
 307      $query .= " ORDER BY $orderby $order";
 308      if ( -1 != $parsed_args['limit'] ) {
 309          $query .= ' LIMIT ' . $parsed_args['limit'];
 310      }
 311  
 312      $results = $wpdb->get_results( $query );
 313  
 314      if ( 'rand()' !== $orderby ) {
 315          $cache[ $key ] = $results;
 316          wp_cache_set( 'get_bookmarks', $cache, 'bookmark' );
 317      }
 318  
 319      /** This filter is documented in wp-includes/bookmark.php */
 320      return apply_filters( 'get_bookmarks', $results, $parsed_args );
 321  }
 322  
 323  /**
 324   * Sanitizes all bookmark fields.
 325   *
 326   * @since 2.3.0
 327   *
 328   * @param stdClass|array $bookmark Bookmark row.
 329   * @param string         $context  Optional. How to filter the fields. Default 'display'.
 330   * @return stdClass|array Same type as $bookmark but with fields sanitized.
 331   */
 332  function sanitize_bookmark( $bookmark, $context = 'display' ) {
 333      $fields = array(
 334          'link_id',
 335          'link_url',
 336          'link_name',
 337          'link_image',
 338          'link_target',
 339          'link_category',
 340          'link_description',
 341          'link_visible',
 342          'link_owner',
 343          'link_rating',
 344          'link_updated',
 345          'link_rel',
 346          'link_notes',
 347          'link_rss',
 348      );
 349  
 350      if ( is_object( $bookmark ) ) {
 351          $do_object = true;
 352          $link_id   = $bookmark->link_id;
 353      } else {
 354          $do_object = false;
 355          $link_id   = $bookmark['link_id'];
 356      }
 357  
 358      foreach ( $fields as $field ) {
 359          if ( $do_object ) {
 360              if ( isset( $bookmark->$field ) ) {
 361                  $bookmark->$field = sanitize_bookmark_field( $field, $bookmark->$field, $link_id, $context );
 362              }
 363          } else {
 364              if ( isset( $bookmark[ $field ] ) ) {
 365                  $bookmark[ $field ] = sanitize_bookmark_field( $field, $bookmark[ $field ], $link_id, $context );
 366              }
 367          }
 368      }
 369  
 370      return $bookmark;
 371  }
 372  
 373  /**
 374   * Sanitizes a bookmark field.
 375   *
 376   * Sanitizes the bookmark fields based on what the field name is. If the field
 377   * has a strict value set, then it will be tested for that, else a more generic
 378   * filtering is applied. After the more strict filter is applied, if the `$context`
 379   * is 'raw' then the value is immediately return.
 380   *
 381   * Hooks exist for the more generic cases. With the 'edit' context, the {@see 'edit_$field'}
 382   * filter will be called and passed the `$value` and `$bookmark_id` respectively.
 383   *
 384   * With the 'db' context, the {@see 'pre_$field'} filter is called and passed the value.
 385   * The 'display' context is the final context and has the `$field` has the filter name
 386   * and is passed the `$value`, `$bookmark_id`, and `$context`, respectively.
 387   *
 388   * @since 2.3.0
 389   *
 390   * @param string $field       The bookmark field.
 391   * @param mixed  $value       The bookmark field value.
 392   * @param int    $bookmark_id Bookmark ID.
 393   * @param string $context     How to filter the field value. Accepts 'raw', 'edit', 'attribute',
 394   *                            'js', 'db', or 'display'
 395   * @return mixed The filtered value.
 396   */
 397  function sanitize_bookmark_field( $field, $value, $bookmark_id, $context ) {
 398      switch ( $field ) {
 399          case 'link_id': // ints
 400          case 'link_rating':
 401              $value = (int) $value;
 402              break;
 403          case 'link_category': // array( ints )
 404              $value = array_map( 'absint', (array) $value );
 405              // We return here so that the categories aren't filtered.
 406              // The 'link_category' filter is for the name of a link category, not an array of a link's link categories.
 407              return $value;
 408  
 409          case 'link_visible': // bool stored as Y|N
 410              $value = preg_replace( '/[^YNyn]/', '', $value );
 411              break;
 412          case 'link_target': // "enum"
 413              $targets = array( '_top', '_blank' );
 414              if ( ! in_array( $value, $targets, true ) ) {
 415                  $value = '';
 416              }
 417              break;
 418      }
 419  
 420      if ( 'raw' === $context ) {
 421          return $value;
 422      }
 423  
 424      if ( 'edit' === $context ) {
 425          /** This filter is documented in wp-includes/post.php */
 426          $value = apply_filters( "edit_{$field}", $value, $bookmark_id );
 427  
 428          if ( 'link_notes' === $field ) {
 429              $value = esc_html( $value ); // textarea_escaped
 430          } else {
 431              $value = esc_attr( $value );
 432          }
 433      } elseif ( 'db' === $context ) {
 434          /** This filter is documented in wp-includes/post.php */
 435          $value = apply_filters( "pre_{$field}", $value );
 436      } else {
 437          /** This filter is documented in wp-includes/post.php */
 438          $value = apply_filters( "{$field}", $value, $bookmark_id, $context );
 439  
 440          if ( 'attribute' === $context ) {
 441              $value = esc_attr( $value );
 442          } elseif ( 'js' === $context ) {
 443              $value = esc_js( $value );
 444          }
 445      }
 446  
 447      return $value;
 448  }
 449  
 450  /**
 451   * Deletes the bookmark cache.
 452   *
 453   * @since 2.7.0
 454   *
 455   * @param int $bookmark_id Bookmark ID.
 456   */
 457  function clean_bookmark_cache( $bookmark_id ) {
 458      wp_cache_delete( $bookmark_id, 'bookmark' );
 459      wp_cache_delete( 'get_bookmarks', 'bookmark' );
 460      clean_object_term_cache( $bookmark_id, 'link' );
 461  }