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<?php
/**
* WordPress Bookmark Administration API
*
* @package WordPress
* @subpackage Administration
*/
/**
* Adds a link using values provided in $_POST.
*
* @since 2.0.0
*
* @return int|WP_Error Value 0 or WP_Error on failure. The link ID on success.
*/
function add_link() {
return edit_link();
}
/**
* Updates or inserts a link using values provided in $_POST.
*
* @since 2.0.0
*
* @param int $link_id Optional. ID of the link to edit. Default 0.
* @return int|WP_Error Value 0 or WP_Error on failure. The link ID on success.
*/
function edit_link( $link_id = 0 ) {
if ( ! current_user_can( 'manage_links' ) ) {
wp_die(
'<h1>' . __( 'You need a higher level of permission.' ) . '</h1>' .
'<p>' . __( 'Sorry, you are not allowed to edit the links for this site.' ) . '</p>',
403
);
}
$_POST['link_url'] = esc_url( $_POST['link_url'] );
$_POST['link_name'] = esc_html( $_POST['link_name'] );
$_POST['link_image'] = esc_html( $_POST['link_image'] );
$_POST['link_rss'] = esc_url( $_POST['link_rss'] );
if ( ! isset( $_POST['link_visible'] ) || 'N' !== $_POST['link_visible'] ) {
$_POST['link_visible'] = 'Y';
}
if ( ! empty( $link_id ) ) {
$_POST['link_id'] = $link_id;
return wp_update_link( $_POST );
} else {
return wp_insert_link( $_POST );
}
}
/**
* Retrieves the default link for editing.
*
* @since 2.0.0
*
* @return stdClass Default link object.
*/
function get_default_link_to_edit() {
$link = new stdClass();
if ( isset( $_GET['linkurl'] ) ) {
$link->link_url = esc_url( wp_unslash( $_GET['linkurl'] ) );
} else {
$link->link_url = '';
}
if ( isset( $_GET['name'] ) ) {
$link->link_name = esc_attr( wp_unslash( $_GET['name'] ) );
} else {
$link->link_name = '';
}
$link->link_visible = 'Y';
return $link;
}
/**
* Deletes a specified link from the database.
*
* @since 2.0.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param int $link_id ID of the link to delete.
* @return true Always true.
*/
function wp_delete_link( $link_id ) {
global $wpdb;
/**
* Fires before a link is deleted.
*
* @since 2.0.0
*
* @param int $link_id ID of the link to delete.
*/
do_action( 'delete_link', $link_id );
wp_delete_object_term_relationships( $link_id, 'link_category' );
$wpdb->delete( $wpdb->links, array( 'link_id' => $link_id ) );
/**
* Fires after a link has been deleted.
*
* @since 2.2.0
*
* @param int $link_id ID of the deleted link.
*/
do_action( 'deleted_link', $link_id );
clean_bookmark_cache( $link_id );
return true;
}
/**
* Retrieves the link category IDs associated with the link specified.
*
* @since 2.1.0
*
* @param int $link_id Link ID to look up.
* @return int[] The IDs of the requested link's categories.
*/
function wp_get_link_cats( $link_id = 0 ) {
$cats = wp_get_object_terms( $link_id, 'link_category', array( 'fields' => 'ids' ) );
return array_unique( $cats );
}
/**
* Retrieves link data based on its ID.
*
* @since 2.0.0
*
* @param int|stdClass $link Link ID or object to retrieve.
* @return object Link object for editing.
*/
function get_link_to_edit( $link ) {
return get_bookmark( $link, OBJECT, 'edit' );
}
/**
* Inserts a link into the database, or updates an existing link.
*
* Runs all the necessary sanitizing, provides default values if arguments are missing,
* and finally saves the link.
*
* @since 2.0.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param array $linkdata {
* Elements that make up the link to insert.
*
* @type int $link_id Optional. The ID of the existing link if updating.
* @type string $link_url The URL the link points to.
* @type string $link_name The title of the link.
* @type string $link_image Optional. A URL of an image.
* @type string $link_target Optional. The target element for the anchor tag.
* @type string $link_description Optional. A short description of the link.
* @type string $link_visible Optional. 'Y' means visible, anything else means not.
* @type int $link_owner Optional. A user ID.
* @type int $link_rating Optional. A rating for the link.
* @type string $link_rel Optional. A relationship of the link to you.
* @type string $link_notes Optional. An extended description of or notes on the link.
* @type string $link_rss Optional. A URL of an associated RSS feed.
* @type int $link_category Optional. The term ID of the link category.
* If empty, uses default link category.
* }
* @param bool $wp_error Optional. Whether to return a WP_Error object on failure. Default false.
* @return int|WP_Error Value 0 or WP_Error on failure. The link ID on success.
*/
function wp_insert_link( $linkdata, $wp_error = false ) {
global $wpdb;
$defaults = array(
'link_id' => 0,
'link_name' => '',
'link_url' => '',
'link_rating' => 0,
);
$parsed_args = wp_parse_args( $linkdata, $defaults );
$parsed_args = wp_unslash( sanitize_bookmark( $parsed_args, 'db' ) );
$link_id = $parsed_args['link_id'];
$link_name = $parsed_args['link_name'];
$link_url = $parsed_args['link_url'];
$update = false;
if ( ! empty( $link_id ) ) {
$update = true;
}
if ( '' === trim( $link_name ) ) {
if ( '' !== trim( $link_url ) ) {
$link_name = $link_url;
} else {
return 0;
}
}
if ( '' === trim( $link_url ) ) {
return 0;
}
$link_rating = ( ! empty( $parsed_args['link_rating'] ) ) ? $parsed_args['link_rating'] : 0;
$link_image = ( ! empty( $parsed_args['link_image'] ) ) ? $parsed_args['link_image'] : '';
$link_target = ( ! empty( $parsed_args['link_target'] ) ) ? $parsed_args['link_target'] : '';
$link_visible = ( ! empty( $parsed_args['link_visible'] ) ) ? $parsed_args['link_visible'] : 'Y';
$link_owner = ( ! empty( $parsed_args['link_owner'] ) ) ? $parsed_args['link_owner'] : get_current_user_id();
$link_notes = ( ! empty( $parsed_args['link_notes'] ) ) ? $parsed_args['link_notes'] : '';
$link_description = ( ! empty( $parsed_args['link_description'] ) ) ? $parsed_args['link_description'] : '';
$link_rss = ( ! empty( $parsed_args['link_rss'] ) ) ? $parsed_args['link_rss'] : '';
$link_rel = ( ! empty( $parsed_args['link_rel'] ) ) ? $parsed_args['link_rel'] : '';
$link_category = ( ! empty( $parsed_args['link_category'] ) ) ? $parsed_args['link_category'] : array();
$link_updated = gmdate( 'Y-m-d H:i:s', current_time( 'timestamp', 0 ) );
// Make sure we set a valid category.
if ( ! is_array( $link_category ) || 0 === count( $link_category ) ) {
$link_category = array( get_option( 'default_link_category' ) );
}
if ( $update ) {
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' ) ) ) {
if ( $wp_error ) {
return new WP_Error( 'db_update_error', __( 'Could not update link in the database.' ), $wpdb->last_error );
} else {
return 0;
}
}
} else {
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' ) ) ) {
if ( $wp_error ) {
return new WP_Error( 'db_insert_error', __( 'Could not insert link into the database.' ), $wpdb->last_error );
} else {
return 0;
}
}
$link_id = (int) $wpdb->insert_id;
}
wp_set_link_cats( $link_id, $link_category );
if ( $update ) {
/**
* Fires after a link was updated in the database.
*
* @since 2.0.0
*
* @param int $link_id ID of the link that was updated.
*/
do_action( 'edit_link', $link_id );
} else {
/**
* Fires after a link was added to the database.
*
* @since 2.0.0
*
* @param int $link_id ID of the link that was added.
*/
do_action( 'add_link', $link_id );
}
clean_bookmark_cache( $link_id );
return $link_id;
}
/**
* Updates link with the specified link categories.
*
* @since 2.1.0
*
* @param int $link_id ID of the link to update.
* @param int[] $link_categories Array of link category IDs to add the link to.
*/
function wp_set_link_cats( $link_id = 0, $link_categories = array() ) {
// If $link_categories isn't already an array, make it one:
if ( ! is_array( $link_categories ) || 0 === count( $link_categories ) ) {
$link_categories = array( get_option( 'default_link_category' ) );
}
$link_categories = array_map( 'intval', $link_categories );
$link_categories = array_unique( $link_categories );
wp_set_object_terms( $link_id, $link_categories, 'link_category' );
clean_bookmark_cache( $link_id );
}
/**
* Updates a link in the database.
*
* @since 2.0.0
*
* @param array $linkdata Link data to update. See wp_insert_link() for accepted arguments.
* @return int|WP_Error Value 0 or WP_Error on failure. The updated link ID on success.
*/
function wp_update_link( $linkdata ) {
$link_id = (int) $linkdata['link_id'];
$link = get_bookmark( $link_id, ARRAY_A );
// Escape data pulled from DB.
$link = wp_slash( $link );
// Passed link category list overwrites existing category list if not empty.
if ( isset( $linkdata['link_category'] ) && is_array( $linkdata['link_category'] )
&& count( $linkdata['link_category'] ) > 0
) {
$link_cats = $linkdata['link_category'];
} else {
$link_cats = $link['link_category'];
}
// Merge old and new fields with new fields overwriting old ones.
$linkdata = array_merge( $link, $linkdata );
$linkdata['link_category'] = $link_cats;
return wp_insert_link( $linkdata );
}
/**
* Outputs the 'disabled' message for the WordPress Link Manager.
*
* @since 3.5.0
* @access private
*
* @global string $pagenow The filename of the current screen.
*/
function wp_link_manager_disabled_message() {
global $pagenow;
if ( ! in_array( $pagenow, array( 'link-manager.php', 'link-add.php', 'link.php' ), true ) ) {
return;
}
add_filter( 'pre_option_link_manager_enabled', '__return_true', 100 );
$really_can_manage_links = current_user_can( 'manage_links' );
remove_filter( 'pre_option_link_manager_enabled', '__return_true', 100 );
if ( $really_can_manage_links ) {
$plugins = get_plugins();
if ( empty( $plugins['link-manager/link-manager.php'] ) ) {
if ( current_user_can( 'install_plugins' ) ) {
$install_url = wp_nonce_url(
self_admin_url( 'update.php?action=install-plugin&plugin=link-manager' ),
'install-plugin_link-manager'
);
wp_die(
sprintf(
/* translators: %s: A link to install the Link Manager plugin. */
__( 'If you are looking to use the link manager, please install the <a href="%s">Link Manager plugin</a>.' ),
esc_url( $install_url )
)
);
}
} elseif ( is_plugin_inactive( 'link-manager/link-manager.php' ) ) {
if ( current_user_can( 'activate_plugins' ) ) {
$activate_url = wp_nonce_url(
self_admin_url( 'plugins.php?action=activate&plugin=link-manager/link-manager.php' ),
'activate-plugin_link-manager/link-manager.php'
);
wp_die(
sprintf(
/* translators: %s: A link to activate the Link Manager plugin. */
__( 'Please activate the <a href="%s">Link Manager plugin</a> to use the link manager.' ),
esc_url( $activate_url )
)
);
}
}
}
wp_die( __( 'Sorry, you are not allowed to edit the links for this site.' ) );
}