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   1  <?php
   2  /**
   3   * WordPress Bookmark Administration API
   4   *
   5   * @package WordPress
   6   * @subpackage Administration
   7   */
   8  
   9  /**
  10   * Add a link to using values provided in $_POST.
  11   *
  12   * @since 2.0.0
  13   *
  14   * @return int|WP_Error Value 0 or WP_Error on failure. The link ID on success.
  15   */
  16  function add_link() {
  17      return edit_link();
  18  }
  19  
  20  /**
  21   * Update or insert a link using values provided in $_POST.
  22   *
  23   * @since 2.0.0
  24   *
  25   * @param int $link_id Optional. ID of the link to edit.
  26   * @return int|WP_Error Value 0 or WP_Error on failure. The link ID on success.
  27   */
  28  function edit_link( $link_id = 0 ) {
  29      if ( !current_user_can( 'manage_links' ) )
  30          wp_die( __( 'Cheatin&#8217; uh?' ) );
  31  
  32      $_POST['link_url'] = esc_html( $_POST['link_url'] );
  33      $_POST['link_url'] = esc_url($_POST['link_url']);
  34      $_POST['link_name'] = esc_html( $_POST['link_name'] );
  35      $_POST['link_image'] = esc_html( $_POST['link_image'] );
  36      $_POST['link_rss'] = esc_url($_POST['link_rss']);
  37      if ( !isset($_POST['link_visible']) || 'N' != $_POST['link_visible'] )
  38          $_POST['link_visible'] = 'Y';
  39  
  40      if ( !empty( $link_id ) ) {
  41          $_POST['link_id'] = $link_id;
  42          return wp_update_link( $_POST );
  43      } else {
  44          return wp_insert_link( $_POST );
  45      }
  46  }
  47  
  48  /**
  49   * Retrieve the default link for editing.
  50   *
  51   * @since 2.0.0
  52   *
  53   * @return object Default link
  54   */
  55  function get_default_link_to_edit() {
  56      $link = new stdClass;
  57      if ( isset( $_GET['linkurl'] ) )
  58          $link->link_url = esc_url( wp_unslash( $_GET['linkurl'] ) );
  59      else
  60          $link->link_url = '';
  61  
  62      if ( isset( $_GET['name'] ) )
  63          $link->link_name = esc_attr( wp_unslash( $_GET['name'] ) );
  64      else
  65          $link->link_name = '';
  66  
  67      $link->link_visible = 'Y';
  68  
  69      return $link;
  70  }
  71  
  72  /**
  73   * Delete link specified from database.
  74   *
  75   * @since 2.0.0
  76   *
  77   * @param int $link_id ID of the link to delete
  78   * @return bool True
  79   */
  80  function wp_delete_link( $link_id ) {
  81      global $wpdb;
  82      /**
  83       * Fires before a link is deleted.
  84       *
  85       * @since 2.0.0
  86       *
  87       * @param int $link_id ID of the link to delete.
  88       */
  89      do_action( 'delete_link', $link_id );
  90  
  91      wp_delete_object_term_relationships( $link_id, 'link_category' );
  92  
  93      $wpdb->delete( $wpdb->links, array( 'link_id' => $link_id ) );
  94      /**
  95       * Fires after a link has been deleted.
  96       *
  97       * @since 2.2.0
  98       *
  99       * @param int $link_id ID of the deleted link.
 100       */
 101      do_action( 'deleted_link', $link_id );
 102  
 103      clean_bookmark_cache( $link_id );
 104  
 105      return true;
 106  }
 107  
 108  /**
 109   * Retrieves the link categories associated with the link specified.
 110   *
 111   * @since 2.1.0
 112   *
 113   * @param int $link_id Link ID to look up
 114   * @return array The requested link's categories
 115   */
 116  function wp_get_link_cats( $link_id = 0 ) {
 117  
 118      $cats = wp_get_object_terms( $link_id, 'link_category', array('fields' => 'ids') );
 119  
 120      return array_unique( $cats );
 121  }
 122  
 123  /**
 124   * Retrieve link data based on ID.
 125   *
 126   * @since 2.0.0
 127   *
 128   * @param int $link_id ID of link to retrieve
 129   * @return object Link for editing
 130   */
 131  function get_link_to_edit( $link_id ) {
 132      return get_bookmark( $link_id, OBJECT, 'edit' );
 133  }
 134  
 135  /**
 136   * This function inserts/updates links into/in the database.
 137   *
 138   * @since 2.0.0
 139   *
 140   * @param array $linkdata Elements that make up the link to insert.
 141   * @param bool $wp_error Optional. If true return WP_Error object on failure.
 142   * @return int|WP_Error Value 0 or WP_Error on failure. The link ID on success.
 143   */
 144  function wp_insert_link( $linkdata, $wp_error = false ) {
 145      global $wpdb;
 146  
 147      $defaults = array( 'link_id' => 0, 'link_name' => '', 'link_url' => '', 'link_rating' => 0 );
 148  
 149      $linkdata = wp_parse_args( $linkdata, $defaults );
 150      $linkdata = sanitize_bookmark( $linkdata, 'db' );
 151  
 152      extract( wp_unslash( $linkdata ), EXTR_SKIP );
 153  
 154      $update = false;
 155  
 156      if ( !empty( $link_id ) )
 157          $update = true;
 158  
 159      if ( trim( $link_name ) == '' ) {
 160          if ( trim( $link_url ) != '' ) {
 161              $link_name = $link_url;
 162          } else {
 163              return 0;
 164          }
 165      }
 166  
 167      if ( trim( $link_url ) == '' )
 168          return 0;
 169  
 170      if ( empty( $link_rating ) )
 171          $link_rating = 0;
 172  
 173      if ( empty( $link_image ) )
 174          $link_image = '';
 175  
 176      if ( empty( $link_target ) )
 177          $link_target = '';
 178  
 179      if ( empty( $link_visible ) )
 180          $link_visible = 'Y';
 181  
 182      if ( empty( $link_owner ) )
 183          $link_owner = get_current_user_id();
 184  
 185      if ( empty( $link_notes ) )
 186          $link_notes = '';
 187  
 188      if ( empty( $link_description ) )
 189          $link_description = '';
 190  
 191      if ( empty( $link_rss ) )
 192          $link_rss = '';
 193  
 194      if ( empty( $link_rel ) )
 195          $link_rel = '';
 196  
 197      // Make sure we set a valid category
 198      if ( ! isset( $link_category ) || 0 == count( $link_category ) || !is_array( $link_category ) ) {
 199          $link_category = array( get_option( 'default_link_category' ) );
 200      }
 201  
 202      if ( $update ) {
 203          if ( false === $wpdb->update( $wpdb->links, compact('link_url', 'link_name', 'link_image', 'link_target', 'link_description', 'link_visible', 'link_rating', 'link_rel', 'link_notes', 'link_rss'), compact('link_id') ) ) {
 204              if ( $wp_error )
 205                  return new WP_Error( 'db_update_error', __( 'Could not update link in the database' ), $wpdb->last_error );
 206              else
 207                  return 0;
 208          }
 209      } else {
 210          if ( false === $wpdb->insert( $wpdb->links, compact('link_url', 'link_name', 'link_image', 'link_target', 'link_description', 'link_visible', 'link_owner', 'link_rating', 'link_rel', 'link_notes', 'link_rss') ) ) {
 211              if ( $wp_error )
 212                  return new WP_Error( 'db_insert_error', __( 'Could not insert link into the database' ), $wpdb->last_error );
 213              else
 214                  return 0;
 215          }
 216          $link_id = (int) $wpdb->insert_id;
 217      }
 218  
 219      wp_set_link_cats( $link_id, $link_category );
 220  
 221      if ( $update ) {
 222          /**
 223           * Fires after a link was updated in the database.
 224           *
 225           * @since 2.0.0
 226           *
 227           * @param int $link_id ID of the link that was updated.
 228           */
 229          do_action( 'edit_link', $link_id );
 230      } else {
 231          /**
 232           * Fires after a link was added to the database.
 233           *
 234           * @since 2.0.0
 235           *
 236           * @param int $link_id ID of the link that was added.
 237           */
 238          do_action( 'add_link', $link_id );
 239      }
 240      clean_bookmark_cache( $link_id );
 241  
 242      return $link_id;
 243  }
 244  
 245  /**
 246   * Update link with the specified link categories.
 247   *
 248   * @since 2.1.0
 249   *
 250   * @param int $link_id ID of link to update
 251   * @param array $link_categories Array of categories to
 252   */
 253  function wp_set_link_cats( $link_id = 0, $link_categories = array() ) {
 254      // If $link_categories isn't already an array, make it one:
 255      if ( !is_array( $link_categories ) || 0 == count( $link_categories ) )
 256          $link_categories = array( get_option( 'default_link_category' ) );
 257  
 258      $link_categories = array_map( 'intval', $link_categories );
 259      $link_categories = array_unique( $link_categories );
 260  
 261      wp_set_object_terms( $link_id, $link_categories, 'link_category' );
 262  
 263      clean_bookmark_cache( $link_id );
 264  }
 265  
 266  /**
 267   * Update a link in the database.
 268   *
 269   * @since 2.0.0
 270   *
 271   * @param array $linkdata Link data to update.
 272   * @return int|WP_Error Value 0 or WP_Error on failure. The updated link ID on success.
 273   */
 274  function wp_update_link( $linkdata ) {
 275      $link_id = (int) $linkdata['link_id'];
 276  
 277      $link = get_bookmark( $link_id, ARRAY_A );
 278  
 279      // Escape data pulled from DB.
 280      $link = wp_slash( $link );
 281  
 282      // Passed link category list overwrites existing category list if not empty.
 283      if ( isset( $linkdata['link_category'] ) && is_array( $linkdata['link_category'] )
 284               && 0 != count( $linkdata['link_category'] ) )
 285          $link_cats = $linkdata['link_category'];
 286      else
 287          $link_cats = $link['link_category'];
 288  
 289      // Merge old and new fields with new fields overwriting old ones.
 290      $linkdata = array_merge( $link, $linkdata );
 291      $linkdata['link_category'] = $link_cats;
 292  
 293      return wp_insert_link( $linkdata );
 294  }
 295  
 296  /**
 297   * @since 3.5.0
 298   * @access private
 299   */
 300  function wp_link_manager_disabled_message() {
 301      global $pagenow;
 302      if ( 'link-manager.php' != $pagenow && 'link-add.php' != $pagenow && 'link.php' != $pagenow )
 303          return;
 304  
 305      add_filter( 'pre_option_link_manager_enabled', '__return_true', 100 );
 306      $really_can_manage_links = current_user_can( 'manage_links' );
 307      remove_filter( 'pre_option_link_manager_enabled', '__return_true', 100 );
 308  
 309      if ( $really_can_manage_links && current_user_can( 'install_plugins' ) ) {
 310          $link = network_admin_url( 'plugin-install.php?tab=search&amp;s=Link+Manager' );
 311          wp_die( sprintf( __( 'If you are looking to use the link manager, please install the <a href="%s">Link Manager</a> plugin.' ), $link ) );
 312      }
 313  
 314      wp_die( __( 'You do not have sufficient permissions to edit the links for this site.' ) );
 315  }
 316  add_action( 'admin_page_access_denied', 'wp_link_manager_disabled_message' );