1<?php
  2/**
  3 * WordPress Bookmark Administration API
  4 *
  5 * @package WordPress
  6 * @subpackage Administration
  7 */
  8
  9/**
 10 * Adds a link 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 */
 16function add_link() {
 17	return edit_link();
 18}
 19
 20/**
 21 * Updates or inserts 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. Default 0.
 26 * @return int|WP_Error Value 0 or WP_Error on failure. The link ID on success.
 27 */
 28function edit_link( $link_id = 0 ) {
 29	if ( ! current_user_can( 'manage_links' ) ) {
 30		wp_die(
 31			'<h1>' . __( 'You need a higher level of permission.' ) . '</h1>' .
 32			'<p>' . __( 'Sorry, you are not allowed to edit the links for this site.' ) . '</p>',
 33			403
 34		);
 35	}
 36
 37	$_POST['link_url']   = esc_url( $_POST['link_url'] );
 38	$_POST['link_name']  = esc_html( $_POST['link_name'] );
 39	$_POST['link_image'] = esc_html( $_POST['link_image'] );
 40	$_POST['link_rss']   = esc_url( $_POST['link_rss'] );
 41	if ( ! isset( $_POST['link_visible'] ) || 'N' !== $_POST['link_visible'] ) {
 42		$_POST['link_visible'] = 'Y';
 43	}
 44
 45	if ( ! empty( $link_id ) ) {
 46		$_POST['link_id'] = $link_id;
 47		return wp_update_link( $_POST );
 48	} else {
 49		return wp_insert_link( $_POST );
 50	}
 51}
 52
 53/**
 54 * Retrieves the default link for editing.
 55 *
 56 * @since 2.0.0
 57 *
 58 * @return stdClass Default link object.
 59 */
 60function get_default_link_to_edit() {
 61	$link = new stdClass();
 62	if ( isset( $_GET['linkurl'] ) ) {
 63		$link->link_url = esc_url( wp_unslash( $_GET['linkurl'] ) );
 64	} else {
 65		$link->link_url = '';
 66	}
 67
 68	if ( isset( $_GET['name'] ) ) {
 69		$link->link_name = esc_attr( wp_unslash( $_GET['name'] ) );
 70	} else {
 71		$link->link_name = '';
 72	}
 73
 74	$link->link_visible = 'Y';
 75
 76	return $link;
 77}
 78
 79/**
 80 * Deletes a specified link from the database.
 81 *
 82 * @since 2.0.0
 83 *
 84 * @global wpdb $wpdb WordPress database abstraction object.
 85 *
 86 * @param int $link_id ID of the link to delete.
 87 * @return true Always true.
 88 */
 89function wp_delete_link( $link_id ) {
 90	global $wpdb;
 91	/**
 92	 * Fires before a link is deleted.
 93	 *
 94	 * @since 2.0.0
 95	 *
 96	 * @param int $link_id ID of the link to delete.
 97	 */
 98	do_action( 'delete_link', $link_id );
 99
100	wp_delete_object_term_relationships( $link_id, 'link_category' );
101
102	$wpdb->delete( $wpdb->links, array( 'link_id' => $link_id ) );
103
104	/**
105	 * Fires after a link has been deleted.
106	 *
107	 * @since 2.2.0
108	 *
109	 * @param int $link_id ID of the deleted link.
110	 */
111	do_action( 'deleted_link', $link_id );
112
113	clean_bookmark_cache( $link_id );
114
115	return true;
116}
117
118/**
119 * Retrieves the link category IDs associated with the link specified.
120 *
121 * @since 2.1.0
122 *
123 * @param int $link_id Link ID to look up.
124 * @return int[] The IDs of the requested link's categories.
125 */
126function wp_get_link_cats( $link_id = 0 ) {
127	$cats = wp_get_object_terms( $link_id, 'link_category', array( 'fields' => 'ids' ) );
128	return array_unique( $cats );
129}
130
131/**
132 * Retrieves link data based on its ID.
133 *
134 * @since 2.0.0
135 *
136 * @param int|stdClass $link Link ID or object to retrieve.
137 * @return object Link object for editing.
138 */
139function get_link_to_edit( $link ) {
140	return get_bookmark( $link, OBJECT, 'edit' );
141}
142
143/**
144 * Inserts a link into the database, or updates an existing link.
145 *
146 * Runs all the necessary sanitizing, provides default values if arguments are missing,
147 * and finally saves the link.
148 *
149 * @since 2.0.0
150 *
151 * @global wpdb $wpdb WordPress database abstraction object.
152 *
153 * @param array $linkdata {
154 *     Elements that make up the link to insert.
155 *
156 *     @type int    $link_id          Optional. The ID of the existing link if updating.
157 *     @type string $link_url         The URL the link points to.
158 *     @type string $link_name        The title of the link.
159 *     @type string $link_image       Optional. A URL of an image.
160 *     @type string $link_target      Optional. The target element for the anchor tag.
161 *     @type string $link_description Optional. A short description of the link.
162 *     @type string $link_visible     Optional. 'Y' means visible, anything else means not.
163 *     @type int    $link_owner       Optional. A user ID.
164 *     @type int    $link_rating      Optional. A rating for the link.
165 *     @type string $link_rel         Optional. A relationship of the link to you.
166 *     @type string $link_notes       Optional. An extended description of or notes on the link.
167 *     @type string $link_rss         Optional. A URL of an associated RSS feed.
168 *     @type int    $link_category    Optional. The term ID of the link category.
169 *                                    If empty, uses default link category.
170 * }
171 * @param bool  $wp_error Optional. Whether to return a WP_Error object on failure. Default false.
172 * @return int|WP_Error Value 0 or WP_Error on failure. The link ID on success.
173 */
174function wp_insert_link( $linkdata, $wp_error = false ) {
175	global $wpdb;
176
177	$defaults = array(
178		'link_id'     => 0,
179		'link_name'   => '',
180		'link_url'    => '',
181		'link_rating' => 0,
182	);
183
184	$parsed_args = wp_parse_args( $linkdata, $defaults );
185	$parsed_args = wp_unslash( sanitize_bookmark( $parsed_args, 'db' ) );
186
187	$link_id   = $parsed_args['link_id'];
188	$link_name = $parsed_args['link_name'];
189	$link_url  = $parsed_args['link_url'];
190
191	$update = false;
192	if ( ! empty( $link_id ) ) {
193		$update = true;
194	}
195
196	if ( '' === trim( $link_name ) ) {
197		if ( '' !== trim( $link_url ) ) {
198			$link_name = $link_url;
199		} else {
200			return 0;
201		}
202	}
203
204	if ( '' === trim( $link_url ) ) {
205		return 0;
206	}
207
208	$link_rating      = ( ! empty( $parsed_args['link_rating'] ) ) ? $parsed_args['link_rating'] : 0;
209	$link_image       = ( ! empty( $parsed_args['link_image'] ) ) ? $parsed_args['link_image'] : '';
210	$link_target      = ( ! empty( $parsed_args['link_target'] ) ) ? $parsed_args['link_target'] : '';
211	$link_visible     = ( ! empty( $parsed_args['link_visible'] ) ) ? $parsed_args['link_visible'] : 'Y';
212	$link_owner       = ( ! empty( $parsed_args['link_owner'] ) ) ? $parsed_args['link_owner'] : get_current_user_id();
213	$link_notes       = ( ! empty( $parsed_args['link_notes'] ) ) ? $parsed_args['link_notes'] : '';
214	$link_description = ( ! empty( $parsed_args['link_description'] ) ) ? $parsed_args['link_description'] : '';
215	$link_rss         = ( ! empty( $parsed_args['link_rss'] ) ) ? $parsed_args['link_rss'] : '';
216	$link_rel         = ( ! empty( $parsed_args['link_rel'] ) ) ? $parsed_args['link_rel'] : '';
217	$link_category    = ( ! empty( $parsed_args['link_category'] ) ) ? $parsed_args['link_category'] : array();
218	$link_updated     = gmdate( 'Y-m-d H:i:s', current_time( 'timestamp', 0 ) );
219
220	// Make sure we set a valid category.
221	if ( ! is_array( $link_category ) || 0 === count( $link_category ) ) {
222		$link_category = array( get_option( 'default_link_category' ) );
223	}
224
225	if ( $update ) {
226		if ( false === $wpdb->update( $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', 'link_updated' ), compact( 'link_id' ) ) ) {
227			if ( $wp_error ) {
228				return new WP_Error( 'db_update_error', __( 'Could not update link in the database.' ), $wpdb->last_error );
229			} else {
230				return 0;
231			}
232		}
233	} else {
234		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', 'link_updated' ) ) ) {
235			if ( $wp_error ) {
236				return new WP_Error( 'db_insert_error', __( 'Could not insert link into the database.' ), $wpdb->last_error );
237			} else {
238				return 0;
239			}
240		}
241		$link_id = (int) $wpdb->insert_id;
242	}
243
244	wp_set_link_cats( $link_id, $link_category );
245
246	if ( $update ) {
247		/**
248		 * Fires after a link was updated in the database.
249		 *
250		 * @since 2.0.0
251		 *
252		 * @param int $link_id ID of the link that was updated.
253		 */
254		do_action( 'edit_link', $link_id );
255	} else {
256		/**
257		 * Fires after a link was added to the database.
258		 *
259		 * @since 2.0.0
260		 *
261		 * @param int $link_id ID of the link that was added.
262		 */
263		do_action( 'add_link', $link_id );
264	}
265	clean_bookmark_cache( $link_id );
266
267	return $link_id;
268}
269
270/**
271 * Updates link with the specified link categories.
272 *
273 * @since 2.1.0
274 *
275 * @param int   $link_id         ID of the link to update.
276 * @param int[] $link_categories Array of link category IDs to add the link to.
277 */
278function wp_set_link_cats( $link_id = 0, $link_categories = array() ) {
279	// If $link_categories isn't already an array, make it one:
280	if ( ! is_array( $link_categories ) || 0 === count( $link_categories ) ) {
281		$link_categories = array( get_option( 'default_link_category' ) );
282	}
283
284	$link_categories = array_map( 'intval', $link_categories );
285	$link_categories = array_unique( $link_categories );
286
287	wp_set_object_terms( $link_id, $link_categories, 'link_category' );
288
289	clean_bookmark_cache( $link_id );
290}
291
292/**
293 * Updates a link in the database.
294 *
295 * @since 2.0.0
296 *
297 * @param array $linkdata Link data to update. See wp_insert_link() for accepted arguments.
298 * @return int|WP_Error Value 0 or WP_Error on failure. The updated link ID on success.
299 */
300function wp_update_link( $linkdata ) {
301	$link_id = (int) $linkdata['link_id'];
302
303	$link = get_bookmark( $link_id, ARRAY_A );
304
305	// Escape data pulled from DB.
306	$link = wp_slash( $link );
307
308	// Passed link category list overwrites existing category list if not empty.
309	if ( isset( $linkdata['link_category'] ) && is_array( $linkdata['link_category'] )
310		&& count( $linkdata['link_category'] ) > 0
311	) {
312		$link_cats = $linkdata['link_category'];
313	} else {
314		$link_cats = $link['link_category'];
315	}
316
317	// Merge old and new fields with new fields overwriting old ones.
318	$linkdata                  = array_merge( $link, $linkdata );
319	$linkdata['link_category'] = $link_cats;
320
321	return wp_insert_link( $linkdata );
322}
323
324/**
325 * Outputs the 'disabled' message for the WordPress Link Manager.
326 *
327 * @since 3.5.0
328 * @access private
329 *
330 * @global string $pagenow The filename of the current screen.
331 */
332function wp_link_manager_disabled_message() {
333	global $pagenow;
334
335	if ( ! in_array( $pagenow, array( 'link-manager.php', 'link-add.php', 'link.php' ), true ) ) {
336		return;
337	}
338
339	add_filter( 'pre_option_link_manager_enabled', '__return_true', 100 );
340	$really_can_manage_links = current_user_can( 'manage_links' );
341	remove_filter( 'pre_option_link_manager_enabled', '__return_true', 100 );
342
343	if ( $really_can_manage_links ) {
344		$plugins = get_plugins();
345
346		if ( empty( $plugins['link-manager/link-manager.php'] ) ) {
347			if ( current_user_can( 'install_plugins' ) ) {
348				$install_url = wp_nonce_url(
349					self_admin_url( 'update.php?action=install-plugin&plugin=link-manager' ),
350					'install-plugin_link-manager'
351				);
352
353				wp_die(
354					sprintf(
355						/* translators: %s: A link to install the Link Manager plugin. */
356						__( 'If you are looking to use the link manager, please install the <a href="%s">Link Manager plugin</a>.' ),
357						esc_url( $install_url )
358					)
359				);
360			}
361		} elseif ( is_plugin_inactive( 'link-manager/link-manager.php' ) ) {
362			if ( current_user_can( 'activate_plugins' ) ) {
363				$activate_url = wp_nonce_url(
364					self_admin_url( 'plugins.php?action=activate&plugin=link-manager/link-manager.php' ),
365					'activate-plugin_link-manager/link-manager.php'
366				);
367
368				wp_die(
369					sprintf(
370						/* translators: %s: A link to activate the Link Manager plugin. */
371						__( 'Please activate the <a href="%s">Link Manager plugin</a> to use the link manager.' ),
372						esc_url( $activate_url )
373					)
374				);
375			}
376		}
377	}
378
379	wp_die( __( 'Sorry, you are not allowed to edit the links for this site.' ) );
380}
381