<?php

/**

 * Link/Bookmark API

 *

 * @package WordPress

 * @subpackage Bookmark

 */

/**

 * Retrieve Bookmark data

 *

 * @since 2.1.0

 *

 * @global wpdb $wpdb WordPress database abstraction object.

 *

 * @param int|stdClass $bookmark

 * @param string $filter Optional, default is 'raw'.

 */

function get_bookmark($bookmark, $output = OBJECT, $filter = 'raw') {

	global $wpdb;

	if ( empty($bookmark) ) {

		if ( isset($GLOBALS['link']) )

			$_bookmark = & $GLOBALS['link'];

		else

			$_bookmark = null;

	} elseif ( is_object($bookmark) ) {

		wp_cache_add($bookmark->link_id, $bookmark, 'bookmark');

		$_bookmark = $bookmark;

	} else {

		if ( isset($GLOBALS['link']) && ($GLOBALS['link']->link_id == $bookmark) ) {

			$_bookmark = & $GLOBALS['link'];

		} elseif ( ! $_bookmark = wp_cache_get($bookmark, 'bookmark') ) {

			$_bookmark = $wpdb->get_row($wpdb->prepare("SELECT * FROM $wpdb->links WHERE link_id = %d LIMIT 1", $bookmark));

			if ( $_bookmark ) {

				$_bookmark->link_category = array_unique( wp_get_object_terms( $_bookmark->link_id, 'link_category', array( 'fields' => 'ids' ) ) );

				wp_cache_add( $_bookmark->link_id, $_bookmark, 'bookmark' );

			}

		}

	}

	if ( ! $_bookmark )

		return $_bookmark;

	$_bookmark = sanitize_bookmark($_bookmark, $filter);

	if ( $output == OBJECT ) {

		return $_bookmark;

	} elseif ( $output == ARRAY_A ) {

		return get_object_vars($_bookmark);

	} elseif ( $output == ARRAY_N ) {

		return array_values(get_object_vars($_bookmark));

	} else {

		return $_bookmark;

	}

}

/**

 * Retrieve single bookmark data item or field.

 *

 * @since 2.3.0

 *

 * @param string $field The name of the data field to return

 * @param int $bookmark The bookmark ID to get field

 * @param string $context Optional. The context of how the field will be used.

 */

function get_bookmark_field( $field, $bookmark, $context = 'display' ) {

	$bookmark = (int) $bookmark;

	$bookmark = get_bookmark( $bookmark );

	if ( is_wp_error($bookmark) )

		return $bookmark;

	if ( !is_object($bookmark) )

		return '';

	if ( !isset($bookmark->$field) )

		return '';

	return sanitize_bookmark_field($field, $bookmark->$field, $bookmark->link_id, $context);

}

/**

 * Retrieves the list of bookmarks

 *

 * Attempts to retrieve from the cache first based on MD5 hash of arguments. If

 * that fails, then the query will be built from the arguments and executed. The

 * results will be stored to the cache.

 *

 * @since 2.1.0

 *

 * @global wpdb $wpdb WordPress database abstraction object.

 *

 * @param string|array $args {

 *     Optional. String or array of arguments to retrieve bookmarks.

 *

 *     @type string   $orderby        How to order the links by. Accepts post fields. Default 'name'.

 *     @type string   $order          Whether to order bookmarks in ascending or descending order.

 *                                    Accepts 'ASC' (ascending) or 'DESC' (descending). Default 'ASC'.

 *     @type int      $limit          Amount of bookmarks to display. Accepts 1+ or -1 for all.

 *                                    Default -1.

 *     @type string   $category       Comma-separated list of category ids to include links from.

 *                                    Default empty.

 *     @type string   $category_name  Category to retrieve links for by name. Default empty.

 *     @type int|bool $hide_invisible Whether to show or hide links marked as 'invisible'. Accepts

 *                                    1|true or 0|false. Default 1|true.

 *     @type int|bool $show_updated   Whether to display the time the bookmark was last updated.

 *                                    Accepts 1|true or 0|false. Default 0|false.

 *     @type string   $include        Comma-separated list of bookmark IDs to include. Default empty.

 *     @type string   $exclude        Comma-separated list of bookmark IDs to exclude. Default empty.

 * }

 * @return array List of bookmark row objects.

 */

function get_bookmarks( $args = '' ) {

	global $wpdb;

	$defaults = array(

		'orderby' => 'name', 'order' => 'ASC',

		'limit' => -1, 'category' => '',

		'category_name' => '', 'hide_invisible' => 1,

		'show_updated' => 0, 'include' => '',

		'exclude' => '', 'search' => ''

	);

	$r = wp_parse_args( $args, $defaults );

	$key = md5( serialize( $r ) );

		if ( is_array( $cache ) && isset( $cache[ $key ] ) ) {

			$bookmarks = $cache[ $key ];

			/**

			 *

			 * The first time the hook is evaluated in this file, it returns the cached

			 * bookmarks list. The second evaluation returns a cached bookmarks list if the

			 * link category is passed but does not exist. The third evaluation returns

			 * the full cached results.

			 *

			 * @since 2.1.0

			 *

			 * @see get_bookmarks()

			 *

			 * @param array $bookmarks List of the cached bookmarks.

			 * @param array $r         An array of bookmark query arguments.

			 */

			return apply_filters( 'get_bookmarks', $bookmarks, $r );

		}

	}

	if ( ! is_array( $cache ) ) {

		$cache = array();

	}

	$inclusions = '';

	if ( ! empty( $r['include'] ) ) {

		$r['exclude'] = '';  //ignore exclude, category, and category_name params if using include

		$r['category'] = '';

		$r['category_name'] = '';

		$inclinks = preg_split( '/[\s,]+/', $r['include'] );

		if ( count( $inclinks ) ) {

			foreach ( $inclinks as $inclink ) {

				if ( empty( $inclusions ) ) {

					$inclusions = ' AND ( link_id = ' . intval( $inclink ) . ' ';

				} else {

					$inclusions .= ' OR link_id = ' . intval( $inclink ) . ' ';

				}

			}

		}

	}

	if (! empty( $inclusions ) ) {

		$inclusions .= ')';

	}

	$exclusions = '';

	if ( ! empty( $r['exclude'] ) ) {

		$exlinks = preg_split( '/[\s,]+/', $r['exclude'] );

		if ( count( $exlinks ) ) {

			foreach ( $exlinks as $exlink ) {

				if ( empty( $exclusions ) ) {

					$exclusions = ' AND ( link_id <> ' . intval( $exlink ) . ' ';

				} else {

					$exclusions .= ' AND link_id <> ' . intval( $exlink ) . ' ';

				}

			}

		}

	}

	if ( ! empty( $exclusions ) ) {

		$exclusions .= ')';

	}

	if ( ! empty( $r['category_name'] ) ) {

		if ( $r['category'] = get_term_by('name', $r['category_name'], 'link_category') ) {

			$r['category'] = $r['category']->term_id;

		} else {

			$cache[ $key ] = array();

			wp_cache_set( 'get_bookmarks', $cache, 'bookmark' );

			/** This filter is documented in wp-includes/bookmark.php */

			return apply_filters( 'get_bookmarks', array(), $r );

		}

	}

	$search = '';

	if ( ! empty( $r['search'] ) ) {

		$like = '%' . $wpdb->esc_like( $r['search'] ) . '%';

		$search = $wpdb->prepare(" AND ( (link_url LIKE %s) OR (link_name LIKE %s) OR (link_description LIKE %s) ) ", $like, $like, $like );

	}

	$category_query = '';

	$join = '';

	if ( ! empty( $r['category'] ) ) {

		$incategories = preg_split( '/[\s,]+/', $r['category'] );

		if ( count($incategories) ) {

			foreach ( $incategories as $incat ) {

				if ( empty( $category_query ) ) {

					$category_query = ' AND ( tt.term_id = ' . intval( $incat ) . ' ';

				} else {

					$category_query .= ' OR tt.term_id = ' . intval( $incat ) . ' ';

				}

			}

		}

	}

	if ( ! empty( $category_query ) ) {

		$category_query .= ") AND taxonomy = 'link_category'";

		$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";

	}

	if ( $r['show_updated'] ) {

		$recently_updated_test = ", IF (DATE_ADD(link_updated, INTERVAL 120 MINUTE) >= NOW(), 1,0) as recently_updated ";

	} else {

		$recently_updated_test = '';

	}

	$get_updated = ( $r['show_updated'] ) ? ', UNIX_TIMESTAMP(link_updated) AS link_updated_f ' : '';

	$orderby = strtolower( $r['orderby'] );

	$length = '';

	switch ( $orderby ) {

		case 'length':

			$length = ", CHAR_LENGTH(link_name) AS length";

			break;

		case 'rand':

			$orderby = 'rand()';

			break;

		case 'link_id':

			$orderby = "$wpdb->links.link_id";

			break;

		default:

			$orderparams = array();

			$keys = array( 'link_id', 'link_name', 'link_url', 'link_visible', 'link_rating', 'link_owner', 'link_updated', 'link_notes', 'link_description' );

			foreach ( explode( ',', $orderby ) as $ordparam ) {

				$ordparam = trim( $ordparam );

				if ( in_array( 'link_' . $ordparam, $keys ) ) {

					$orderparams[] = 'link_' . $ordparam;

				} elseif ( in_array( $ordparam, $keys ) ) {

					$orderparams[] = $ordparam;

				}

			}

			$orderby = implode( ',', $orderparams );

	}

	if ( empty( $orderby ) ) {

		$orderby = 'link_name';

	}

	$order = strtoupper( $r['order'] );

	if ( '' !== $order && ! in_array( $order, array( 'ASC', 'DESC' ) ) ) {

		$order = 'ASC';

	}

	$visible = '';

	if ( $r['hide_invisible'] ) {

		$visible = "AND link_visible = 'Y'";

	}

	$query = "SELECT * $length $recently_updated_test $get_updated FROM $wpdb->links $join WHERE 1=1 $visible $category_query";

	$query .= " $exclusions $inclusions $search";

	$query .= " ORDER BY $orderby $order";

	if ( $r['limit'] != -1 ) {

		$query .= ' LIMIT ' . $r['limit'];

	}

	$results = $wpdb->get_results( $query );

	/** This filter is documented in wp-includes/bookmark.php */

	return apply_filters( 'get_bookmarks', $results, $r );

}

/**

 * Sanitizes all bookmark fields

 *

 * @since 2.3.0

 *

 * @param string $context Optional, default is 'display'. How to filter the

 *		fields

 */

function sanitize_bookmark($bookmark, $context = 'display') {

	$fields = array('link_id', 'link_url', 'link_name', 'link_image', 'link_target', 'link_category',

		'link_description', 'link_visible', 'link_owner', 'link_rating', 'link_updated',

		'link_rel', 'link_notes', 'link_rss', );

	if ( is_object($bookmark) ) {

		$do_object = true;

		$link_id = $bookmark->link_id;

	} else {

		$do_object = false;

		$link_id = $bookmark['link_id'];

	}

	foreach ( $fields as $field ) {

		if ( $do_object ) {

			if ( isset($bookmark->$field) )

				$bookmark->$field = sanitize_bookmark_field($field, $bookmark->$field, $link_id, $context);

		} else {

			if ( isset($bookmark[$field]) )

				$bookmark[$field] = sanitize_bookmark_field($field, $bookmark[$field], $link_id, $context);

		}

	}

	return $bookmark;

}

/**

 *

 * Sanitizes the bookmark fields based on what the field name is. If the field

 * has a strict value set, then it will be tested for that, else a more generic

 *

 *

 * @since 2.3.0

 *

 */

	switch ( $field ) {

	case 'link_id' : // ints

	case 'link_rating' :

		$value = (int) $value;

		break;

	case 'link_category' : // array( ints )

		$value = array_map('absint', (array) $value);

		// We return here so that the categories aren't filtered.

		// The 'link_category' filter is for the name of a link category, not an array of a link's link categories

		return $value;

	case 'link_visible' : // bool stored as Y|N

		$value = preg_replace('/[^YNyn]/', '', $value);

		break;

	case 'link_target' : // "enum"

		$targets = array('_top', '_blank');

		if ( ! in_array($value, $targets) )

			$value = '';

		break;

	}

	if ( 'raw' == $context )

		return $value;

	if ( 'edit' == $context ) {

		/** This filter is documented in wp-includes/post.php */

		if ( 'link_notes' == $field ) {

			$value = esc_html( $value ); // textarea_escaped

		} else {

			$value = esc_attr($value);

		}

	} elseif ( 'db' == $context ) {

		/** This filter is documented in wp-includes/post.php */

	} else {

		/** This filter is documented in wp-includes/post.php */

		if ( 'attribute' == $context ) {