Fix missing application of search filters

wp-content/themes/humanity-theme/functions.php

@@ -212,6 +212,7 @@
 require_once realpath( __DIR__ . '/includes/features/search/query-vars.php' );
 require_once realpath( __DIR__ . '/includes/features/search/class-search-page.php' );
 require_once realpath( __DIR__ . '/includes/features/search/class-search-filters.php' );
+require_once realpath( __DIR__ . '/includes/features/search/class-search-results.php' );
 #endregion search
 
 /**

wp-content/themes/humanity-theme/includes/features/search/class-search-results.php

@@ -0,0 +1,184 @@
+<?php
+
+declare( strict_types = 1 );
+
+namespace Amnesty;
+
+use WP_Query;
+use WP_Tax_Query;
+use WP_Term;
+
+new Search_Results();
+
+/**
+ * Search results modifications
+ */
+class Search_Results {
+
+	/**
+	 * Bind hooks
+	 */
+	public function __construct() {
+		add_action( 'pre_get_posts', [ $this, 'boot' ], 9 );
+	}
+
+	/**
+	 * Undocumented function
+	 *
+	 * @param \WP_Query $query the main query object
+	 *
+	 * @return void
+	 */
+	public function boot( WP_Query $query ): void {
+		if ( $this->should_filter_search( $query ) ) {
+			add_filter( 'posts_request', [ $this, 'filter_posts_request' ], 10, 2 );
+		}
+	}
+
+	/**
+	 * Rewrite search query SQL if documents are to be searched for
+	 *
+	 * @param string    $sql   the existing SQL query
+	 * @param \WP_Query $query the Query object
+	 *
+	 * @return string
+	 */
+	public function filter_posts_request( string $sql, WP_Query $query ): string {
+		/**
+		 * The global db object
+		 *
+		 * @var \wpdb $wpdb the db object
+		 */
+		global $wpdb;
+
+		if ( ! $this->should_filter_search( $query ) ) {
+			return $sql;
+		}
+
+		$custom_query = amnesty_get_searchpage_query_object( false );
+
+		return $wpdb->remove_placeholder_escape( $custom_query->get_sql() );
+	}
+
+	/**
+	 * Build the JOIN/WHERE portion of the SQL query that
+	 * directly relates to the selected taxonomy terms.
+	 *
+	 * @param array<string,array<int,int>> $terms the taxonomy terms
+	 *
+	 * @return array<string,string>
+	 */
+	final public function get_tax_query( array $terms ): array {
+		global $wpdb;
+
+		static $tax_query;
+
+		if ( ! isset( $tax_query ) ) {
+			$tax_query = new WP_Tax_Query( $this->build_tax_args( $terms ) );
+			$tax_query = $tax_query->get_sql( $wpdb->posts, 'id' );
+		}
+
+		return $tax_query;
+	}
+
+	/**
+	 * Check whether the searchpage has active taxonomy filters
+	 * Build tax_query argument list for them, if so
+	 *
+	 * @param array<string,array<int,int>> $terms the taxonomy terms
+	 *
+	 * @return array<mixed>
+	 */
+	final public function build_tax_args( array $terms ): array {
+		$tax_query = [];
+
+		foreach ( $terms as $taxonomy => $term_ids ) {
+			$tax_query[] = [
+				'taxonomy' => $taxonomy,
+				'field'    => 'id',
+				'terms'    => $term_ids,
+			];
+		}
+
+		if ( empty( $tax_query ) ) {
+			return $tax_query;
+		}
+
+		return [
+			'relation' => 'AND',
+			...$tax_query,
+		];
+	}
+
+	/**
+	 * Retrieve term ids from request and convert to slugs
+	 *
+	 * @return array<string,array<int,string>>
+	 */
+	final protected function term_ids_to_slugs(): array {
+		$terms = [];
+
+		foreach ( get_taxonomies( [ 'public' => true ] ) as $tax_name ) {
+			$tax_qvar = query_var_to_array( "q{$tax_name}" );
+
+			if ( ! $tax_qvar ) {
+				continue;
+			}
+
+			$objects = get_terms(
+				[
+					'taxonomy' => $tax_name,
+					'include'  => $tax_qvar,
+				]
+			);
+
+			$terms[ $tax_name ] = array_map( fn ( WP_Term $t ): string => $t->slug, $objects );
+		}
+
+		return $terms;
+	}
+
+	/**
+	 * Convert list of taxonomy slugs to term ids
+	 *
+	 * @param array<string,array<int,string>> $term_list the list of tax=>terms slugs
+	 *
+	 * @return array<string,array<int,int>>
+	 */
+	final protected function slugs_to_term_ids( array $term_list ): array {
+		$terms = [];
+
+		foreach ( $term_list as $tax_slug => $term_slugs ) {
+			$objects = get_terms(
+				[
+					'taxonomy' => $tax_slug,
+					'slug'     => $term_slugs,
+				]
+			);
+
+			$terms[ $tax_slug ] = array_map( fn ( WP_Term $t ): int => $t->term_id, $objects );
+		}
+
+		return $terms;
+	}
+
+	/**
+	 * Check whether we should add PDFs to the query
+	 *
+	 * @param \WP_Query $query the query to check
+	 *
+	 * @return bool
+	 */
+	final protected function should_filter_search( WP_Query $query ): bool {
+		if ( is_admin() || ! is_search() || ! $query->is_main_query() ) {
+			return false;
+		}
+
+		if ( defined( 'REST_REQUEST' ) && REST_REQUEST ) {
+			return false;
+		}
+
+		return true;
+	}
+
+}