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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( $_GET['linkurl'] );
  59      else
  60          $link->link_url = '';
  61  
  62      if ( isset( $_GET['name'] ) )
  63          $link->link_name = esc_attr( $_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      do_action( 'delete_link', $link_id );
  84  
  85      wp_delete_object_term_relationships( $link_id, 'link_category' );
  86  
  87      $wpdb->delete( $wpdb->links, array( 'link_id' => $link_id ) );
  88  
  89      do_action( 'deleted_link', $link_id );
  90  
  91      clean_bookmark_cache( $link_id );
  92  
  93      return true;
  94  }
  95  
  96  /**
  97   * Retrieves the link categories associated with the link specified.
  98   *
  99   * @since 2.1.0
 100   *
 101   * @param int $link_id Link ID to look up
 102   * @return array The requested link's categories
 103   */
 104  function wp_get_link_cats( $link_id = 0 ) {
 105  
 106      $cats = wp_get_object_terms( $link_id, 'link_category', array('fields' => 'ids') );
 107  
 108      return array_unique( $cats );
 109  }
 110  
 111  /**
 112   * Retrieve link data based on ID.
 113   *
 114   * @since 2.0.0
 115   *
 116   * @param int $link_id ID of link to retrieve
 117   * @return object Link for editing
 118   */
 119  function get_link_to_edit( $link_id ) {
 120      return get_bookmark( $link_id, OBJECT, 'edit' );
 121  }
 122  
 123  /**
 124   * This function inserts/updates links into/in the database.
 125   *
 126   * @since 2.0.0
 127   *
 128   * @param array $linkdata Elements that make up the link to insert.
 129   * @param bool $wp_error Optional. If true return WP_Error object on failure.
 130   * @return int|WP_Error Value 0 or WP_Error on failure. The link ID on success.
 131   */
 132  function wp_insert_link( $linkdata, $wp_error = false ) {
 133      global $wpdb;
 134  
 135      $defaults = array( 'link_id' => 0, 'link_name' => '', 'link_url' => '', 'link_rating' => 0 );
 136  
 137      $linkdata = wp_parse_args( $linkdata, $defaults );
 138      $linkdata = sanitize_bookmark( $linkdata, 'db' );
 139  
 140      extract( stripslashes_deep( $linkdata ), EXTR_SKIP );
 141  
 142      $update = false;
 143  
 144      if ( !empty( $link_id ) )
 145          $update = true;
 146  
 147      if ( trim( $link_name ) == '' ) {
 148          if ( trim( $link_url ) != '' ) {
 149              $link_name = $link_url;
 150          } else {
 151              return 0;
 152          }
 153      }
 154  
 155      if ( trim( $link_url ) == '' )
 156          return 0;
 157  
 158      if ( empty( $link_rating ) )
 159          $link_rating = 0;
 160  
 161      if ( empty( $link_image ) )
 162          $link_image = '';
 163  
 164      if ( empty( $link_target ) )
 165          $link_target = '';
 166  
 167      if ( empty( $link_visible ) )
 168          $link_visible = 'Y';
 169  
 170      if ( empty( $link_owner ) )
 171          $link_owner = get_current_user_id();
 172  
 173      if ( empty( $link_notes ) )
 174          $link_notes = '';
 175  
 176      if ( empty( $link_description ) )
 177          $link_description = '';
 178  
 179      if ( empty( $link_rss ) )
 180          $link_rss = '';
 181  
 182      if ( empty( $link_rel ) )
 183          $link_rel = '';
 184  
 185      // Make sure we set a valid category
 186      if ( ! isset( $link_category ) || 0 == count( $link_category ) || !is_array( $link_category ) ) {
 187          $link_category = array( get_option( 'default_link_category' ) );
 188      }
 189  
 190      if ( $update ) {
 191          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') ) ) {
 192              if ( $wp_error )
 193                  return new WP_Error( 'db_update_error', __( 'Could not update link in the database' ), $wpdb->last_error );
 194              else
 195                  return 0;
 196          }
 197      } else {
 198          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') ) ) {
 199              if ( $wp_error )
 200                  return new WP_Error( 'db_insert_error', __( 'Could not insert link into the database' ), $wpdb->last_error );
 201              else
 202                  return 0;
 203          }
 204          $link_id = (int) $wpdb->insert_id;
 205      }
 206  
 207      wp_set_link_cats( $link_id, $link_category );
 208  
 209      if ( $update )
 210          do_action( 'edit_link', $link_id );
 211      else
 212          do_action( 'add_link', $link_id );
 213  
 214      clean_bookmark_cache( $link_id );
 215  
 216      return $link_id;
 217  }
 218  
 219  /**
 220   * Update link with the specified link categories.
 221   *
 222   * @since 2.1.0
 223   *
 224   * @param int $link_id ID of link to update
 225   * @param array $link_categories Array of categories to
 226   */
 227  function wp_set_link_cats( $link_id = 0, $link_categories = array() ) {
 228      // If $link_categories isn't already an array, make it one:
 229      if ( !is_array( $link_categories ) || 0 == count( $link_categories ) )
 230          $link_categories = array( get_option( 'default_link_category' ) );
 231  
 232      $link_categories = array_map( 'intval', $link_categories );
 233      $link_categories = array_unique( $link_categories );
 234  
 235      wp_set_object_terms( $link_id, $link_categories, 'link_category' );
 236  
 237      clean_bookmark_cache( $link_id );
 238  }
 239  
 240  /**
 241   * Update a link in the database.
 242   *
 243   * @since 2.0.0
 244   *
 245   * @param array $linkdata Link data to update.
 246   * @return int|WP_Error Value 0 or WP_Error on failure. The updated link ID on success.
 247   */
 248  function wp_update_link( $linkdata ) {
 249      $link_id = (int) $linkdata['link_id'];
 250  
 251      $link = get_bookmark( $link_id, ARRAY_A );
 252  
 253      // Escape data pulled from DB.
 254      $link = add_magic_quotes( $link );
 255  
 256      // Passed link category list overwrites existing category list if not empty.
 257      if ( isset( $linkdata['link_category'] ) && is_array( $linkdata['link_category'] )
 258               && 0 != count( $linkdata['link_category'] ) )
 259          $link_cats = $linkdata['link_category'];
 260      else
 261          $link_cats = $link['link_category'];
 262  
 263      // Merge old and new fields with new fields overwriting old ones.
 264      $linkdata = array_merge( $link, $linkdata );
 265      $linkdata['link_category'] = $link_cats;
 266  
 267      return wp_insert_link( $linkdata );
 268  }