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<?php namespace Yoast\WP\SEO\Integrations\Front_End; use WP_Query; use Yoast\WP\SEO\Conditionals\Front_End_Conditional; use Yoast\WP\SEO\Helpers\Options_Helper; use Yoast\WP\SEO\Helpers\Redirect_Helper; use Yoast\WP\SEO\Integrations\Integration_Interface; /** * Class Crawl_Cleanup_Searches. */ class Crawl_Cleanup_Searches implements Integration_Interface { /** * Patterns to match against to find spam. * * @var array */ private $patterns = [ '/[：（）【】［］]+/u', '/(TALK|QQ)\:/iu', ]; /** * The options helper. * * @var Options_Helper */ private $options_helper; /** * The redirect helper. * * @var Redirect_Helper */ private $redirect_helper; /** * Crawl_Cleanup_Searches integration constructor. * * @param Options_Helper $options_helper The option helper. * @param Redirect_Helper $redirect_helper The redirect helper. */ public function __construct( Options_Helper $options_helper, Redirect_Helper $redirect_helper ) { $this->options_helper = $options_helper; $this->redirect_helper = $redirect_helper; } /** * Initializes the integration. * * This is the place to register hooks and filters. * * @return void */ public function register_hooks() { if ( $this->options_helper->get( 'search_cleanup' ) ) { \add_filter( 'pre_get_posts', [ $this, 'validate_search' ] ); } if ( $this->options_helper->get( 'redirect_search_pretty_urls' ) && ! empty( \get_option( 'permalink_structure' ) ) ) { \add_action( 'template_redirect', [ $this, 'maybe_redirect_searches' ], 2 ); } } /** * Returns the conditionals based in which this loadable should be active. * * @return array The array of conditionals. */ public static function get_conditionals() { return [ Front_End_Conditional::class ]; } /** * Check if we want to allow this search to happen. * * @param WP_Query $query The main query. * * @return WP_Query */ public function validate_search( WP_Query $query ) { if ( ! $query->is_search() ) { return $query; } // First check against emoji and patterns we might not want. $this->check_unwanted_patterns( $query ); // Then limit characters if still needed. $this->limit_characters(); return $query; } /** * Redirect pretty search URLs to the "raw" equivalent * * @return void */ public function maybe_redirect_searches() { if ( ! \is_search() ) { return; } // phpcs:ignore WordPress.Security.ValidatedSanitizedInput if ( isset( $_SERVER['REQUEST_URI'] ) && \stripos( $_SERVER['REQUEST_URI'], '/search/' ) === 0 ) { $args = []; // phpcs:ignore WordPress.Security.ValidatedSanitizedInput $parsed = \wp_parse_url( $_SERVER['REQUEST_URI'] ); if ( ! empty( $parsed['query'] ) ) { \wp_parse_str( $parsed['query'], $args ); } $args['s'] = \get_search_query(); $proper_url = \home_url( '/' ); if ( \intval( \get_query_var( 'paged' ) ) > 1 ) { $proper_url .= \sprintf( 'page/%s/', \get_query_var( 'paged' ) ); unset( $args['paged'] ); } $proper_url = \add_query_arg( \array_map( 'rawurlencode_deep', $args ), $proper_url ); if ( ! empty( $parsed['fragment'] ) ) { $proper_url .= '#' . \rawurlencode( $parsed['fragment'] ); } $this->redirect_away( 'We redirect pretty URLs to the raw format.', $proper_url ); } } /** * Check query against unwanted search patterns. * * @param WP_Query $query The main WordPress query. * * @return void */ private function check_unwanted_patterns( WP_Query $query ) { $s = \rawurldecode( $query->query_vars['s'] ); if ( $this->options_helper->get( 'search_cleanup_emoji' ) && $this->has_emoji( $s ) ) { $this->redirect_away( 'We don\'t allow searches with emojis and other special characters.' ); } if ( ! $this->options_helper->get( 'search_cleanup_patterns' ) ) { return; } foreach ( $this->patterns as $pattern ) { $outcome = \preg_match( $pattern, $s, $matches ); if ( $outcome && $matches !== [] ) { $this->redirect_away( 'Your search matched a common spam pattern.' ); } } } /** * Redirect to the homepage for invalid searches. * * @param string $reason The reason for redirecting away. * @param string $to_url The URL to redirect to. * * @return void */ private function redirect_away( $reason, $to_url = '' ) { if ( empty( $to_url ) ) { $to_url = \get_home_url(); } $this->redirect_helper->do_safe_redirect( $to_url, 301, 'Yoast Search Filtering: ' . $reason ); } /** * Limits the number of characters in the search query. * * @return void */ private function limit_characters() { // We retrieve the search term unescaped because we want to count the characters properly. We make sure to escape it afterwards, if we do something with it. $unescaped_s = \get_search_query( false ); // We then unslash the search term, again because we want to count the characters properly. We make sure to slash it afterwards, if we do something with it. $raw_s = \wp_unslash( $unescaped_s ); if ( \mb_strlen( $raw_s, 'UTF-8' ) > $this->options_helper->get( 'search_character_limit' ) ) { $new_s = \mb_substr( $raw_s, 0, $this->options_helper->get( 'search_character_limit' ), 'UTF-8' ); \set_query_var( 's', \wp_slash( \esc_attr( $new_s ) ) ); } } /** * Determines if a text string contains an emoji or not. * * @param string $text The text string to detect emoji in. * * @return bool */ private function has_emoji( $text ) { $emojis_regex = '/([^-\p{L}\x00-\x7F]+)/u'; \preg_match( $emojis_regex, $text, $matches ); return ! empty( $matches ); } }
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