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210 lines
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PHP

<?php
/**
* The Content Processor.
*
* Extract and save links from the content of a given post.
*
* @since 0.9.0
* @package RankMath
* @subpackage RankMath\Links
* @author Rank Math <support@rankmath.com>
*
* @copyright Copyright (C) 2008-2019, Yoast BV
* The following code is a derivative work of the code from the Yoast(https://github.com/Yoast/wordpress-seo/), which is licensed under GPL v3.
*/
namespace RankMath\Links;
use RankMath\Helpers\Str;
use RankMath\Helper;
use RankMath\Sitemap\Classifier;
defined( 'ABSPATH' ) || exit;
/**
* ContentProcessor class.
*/
class ContentProcessor {
/**
* Link storage.
*
* @var Storage
*/
public $storage;
/**
* Link classifier.
*
* @var Classifier
*/
protected $classifier;
/**
* The Constructor
*/
public function __construct() {
$this->storage = new Storage();
$this->classifier = new Classifier( home_url() );
}
/**
* Process the content.
*
* @param int $post_id The post ID.
* @param string $content The content.
*/
public function process( $post_id, $content ) {
$links = $this->extract( $content );
$counts = [
'internal_link_count' => 0,
'external_link_count' => 0,
];
$new_links = [];
$post_permalink = $this->normalize_link( get_permalink( $post_id ) );
foreach ( $links as $link ) {
$normalized_link = $this->normalize_link( $link );
if ( $post_permalink === $normalized_link ) {
continue;
}
$this->process_link( $link, $new_links, $counts );
}
$old_links = $this->get_stored_internal_links( $post_id );
$this->storage->cleanup( $post_id );
$this->storage->save_links( $post_id, $new_links );
$this->storage->update_link_counts( $post_id, $counts, array_merge( $new_links, $old_links ) );
}
/**
* Process a link.
*
* @param string $link Link to process.
* @param array $list Links to add after process.
* @param array $counts Counts array.
*/
private function process_link( $link, &$list, &$counts ) {
$link_type = $this->is_valid_link_type( $link );
if ( empty( $link_type ) ) {
return;
}
$target_post_id = 0;
if ( Classifier::TYPE_INTERNAL === $link_type ) {
$target_post_id = url_to_postid( $link );
if ( 0 === $target_post_id ) {
// Maybe a product with altered url!
$target_post_id = $this->maybe_product_id( $link );
}
}
$counts[ "{$link_type}_link_count" ] += 1;
$list[] = new Link( $link, $target_post_id, $link_type );
}
/**
* Extract href property values from HTML string.
*
* @param string $content Content to extract links from.
*
* @return array The extracted links.
*/
public function extract( $content ) {
$links = [];
if ( false === Str::contains( 'href', $content ) ) {
return $links;
}
$regexp = '<a\s[^>]*href=("??)([^" >]*?)\\1[^>]*>';
// Case insensitive & ungreedy modifiers.
if ( preg_match_all( "/$regexp/iU", $content, $matches, PREG_SET_ORDER ) ) {
foreach ( $matches as $match ) {
$links[] = trim( $match[2], "'" );
}
}
return $links;
}
/**
* Retrieves the stored internal links for the supplied post.
*
* @param int $post_id The post to fetch links for.
*
* @return Link[] List of internal links connected to the post.
*/
public function get_stored_internal_links( $post_id ) {
$links = $this->storage->get_links( $post_id );
return array_filter( $links, [ $this, 'filter_internal_link' ] );
}
/**
* Filter internal links.
*
* @param Link $link Link to test.
*
* @return bool True if internal, false if external.
*/
protected function filter_internal_link( Link $link ) {
return $link->get_type() === Classifier::TYPE_INTERNAL;
}
/**
* Check if link is valid.
*
* @param string $link Link to check.
*
* @return boolean
*/
private function is_valid_link_type( $link ) {
$type = false;
if ( ! empty( $link ) && '#' !== $link[0] ) {
$type = $this->classifier->classify( $link );
}
if ( Classifier::TYPE_INTERNAL === $type && preg_match( '/\.(jpg|jpeg|png|gif|bmp|pdf|mp3|zip)$/i', $link ) ) {
$type = false;
}
/**
* Filter: 'rank_math/links/link_type' - Allow developers to filter the link type.
*/
return apply_filters( 'rank_math/links/link_type', $type, $link );
}
/**
* Normalize a link: remove trailing slash, remove fragment identifier, remove home_url.
*
* @param string $link The link to normalize.
* @return string
*/
private function normalize_link( $link ) {
$normalized = untrailingslashit( str_replace( home_url(), '', explode( '#', $link )[0] ) );
return $normalized;
}
/**
* Gets the post id from a modified link.
*
* @param string $link Link to process.
* @return int
*/
private function maybe_product_id( $link ) {
// Early bail if Remove Base option is not enabled.
if ( ! Helper::get_settings( 'general.wc_remove_product_base' ) ) {
return 0;
}
$product = get_page_by_path( basename( untrailingslashit( $link ) ), OBJECT, [ 'product' ] );
if ( ! $product ) {
return 0;
}
return $product->ID;
}
}