Facet by Meta

assets/js/blocks/facets/meta/block.json

@@ -0,0 +1,34 @@
+{
+	"$schema": "https://schemas.wp.org/trunk/block.json",
+	"apiVersion": 2,
+	"title": "Facet by Meta (ElasticPress)",
+	"textdomain": "elasticpress",
+	"name": "elasticpress/facet-meta",
+	"icon": "feedback",
+	"category": "widgets",
+	"attributes": {
+		"searchPlaceholder": {
+			"type": "string",
+			"default": "Search"
+		},
+		"facet": {
+			"type": "string",
+			"default": ""
+		},
+		"orderby": {
+			"type"   : "string",
+			"default": "count",
+			"enum"   : [ "count", "name" ]
+		},
+		"order":  {
+			"type":  "string",
+			"default": "desc",
+			"enum":  [ "desc", "asc" ]
+		}
+	},
+	"supports": {
+		"html": false
+	},
+	"editorScript": "file:/../../../../../dist/js/facets-meta-block-script.min.js",
+	"style": "file:/../../../../../dist/css/facets-styles.min.css"
+}

assets/js/blocks/facets/meta/edit.js

@@ -0,0 +1,105 @@
+import { InspectorControls, useBlockProps } from '@wordpress/block-editor';
+import {
+	PanelBody,
+	RadioControl,
+	TextControl,
+	Spinner,
+	Placeholder,
+	SelectControl,
+} from '@wordpress/components';
+import { Fragment, useEffect, useState, useCallback } from '@wordpress/element';
+import apiFetch from '@wordpress/api-fetch';
+import { __ } from '@wordpress/i18n';
+
+const FacetBlockEdit = (props) => {
+	const { attributes, setAttributes } = props;
+	const [metaKeys, setMetaKeys] = useState([]);
+	const [preview, setPreview] = useState('');
+	const [loading, setLoading] = useState(false);
+	const { searchPlaceholder, facet, orderby, order } = attributes;
+
+	const blockProps = useBlockProps();
+
+	const load = useCallback(async () => {
+		const metaKeys = await apiFetch({
+			path: '/elasticpress/v1/facets/meta/keys',
+		});
+		setMetaKeys(metaKeys);
+	}, [setMetaKeys]);
+
+	useEffect(load, [load]);
+
+	useEffect(() => {
+		setLoading(true);
+		const params = new URLSearchParams({
+			searchPlaceholder,
+			facet,
+			orderby,
+			order,
+		});
+		apiFetch({
+			path: `/elasticpress/v1/facets/meta/block-preview?${params}`,
+		})
+			.then((preview) => setPreview(preview))
+			.finally(() => setLoading(false));
+	}, [searchPlaceholder, facet, orderby, order]);
+
+	return (
+		<Fragment>
+			<InspectorControls>
+				<PanelBody title={__('Facet Settings', 'elasticpress')}>
+					<TextControl
+						label={__('Search Placeholder', 'elasticpress')}
+						value={searchPlaceholder}
+						onChange={(value) => setAttributes({ searchPlaceholder: value })}
+					/>
+					<SelectControl
+						label={__('Meta Field Key', 'elasticpress')}
+						help={__(
+							'This is the list of meta fields indexed in Elasticsearch. If you do not see your field here, you might need to sync your content.',
+							'elasticpress',
+						)}
+						value={facet}
+						options={[
+							...metaKeys.map((metaKey) => ({
+								label: metaKey,
+								value: metaKey,
+							})),
+						]}
+						onChange={(value) => setAttributes({ facet: value })}
+					/>
+					<RadioControl
+						label={__('Order By', 'elasticpress')}
+						help={__('The field used to order available options', 'elasticpress')}
+						selected={orderby}
+						options={[
+							{ label: __('Count', 'elasticpress'), value: 'count' },
+							{ label: __('Name', 'elasticpress'), value: 'name' },
+						]}
+						onChange={(value) => setAttributes({ orderby: value })}
+					/>
+					<RadioControl
+						label={__('Order', 'elasticpress')}
+						selected={order}
+						options={[
+							{ label: __('ASC', 'elasticpress'), value: 'asc' },
+							{ label: __('DESC', 'elasticpress'), value: 'desc' },
+						]}
+						onChange={(value) => setAttributes({ order: value })}
+					/>
+				</PanelBody>
+			</InspectorControls>
+
+			<div {...blockProps}>
+				{loading && (
+					<Placeholder>
+						<Spinner />
+					</Placeholder>
+				)}
+				{/* eslint-disable-next-line react/no-danger */}
+				{!loading && <div dangerouslySetInnerHTML={{ __html: preview }} />}
+			</div>
+		</Fragment>
+	);
+};
+export default FacetBlockEdit;

assets/js/blocks/facets/meta/index.js

@@ -0,0 +1,15 @@
+/**
+ * WordPress dependencies.
+ */
+import { registerBlockType } from '@wordpress/blocks';
+
+/**
+ * Internal dependencies.
+ */
+import edit from './edit';
+import block from './block.json';
+
+registerBlockType(block, {
+	edit,
+	save: () => {},
+});

includes/classes/Elasticsearch.php

@@ -466,6 +466,7 @@ public function query( $index, $type, $query, $query_args, $query_object = null
 				[
 					'found_documents' => $total_hits,
 					'documents'       => $documents,
+					'aggregations'    => $response['aggregations'] ?? [],
 				],
 				$response,
 				$query,

includes/classes/Feature/Facets/Facets.php

@@ -51,6 +51,7 @@ public function __construct() {
 
 		$types = [
 			'taxonomy' => __NAMESPACE__ . '\Types\Taxonomy\FacetType',
+			'meta'     => __NAMESPACE__ . '\Types\Meta\FacetType',
 		];
 
 		/**

includes/classes/Feature/Facets/Types/Meta/Block.php

@@ -0,0 +1,213 @@
+<?php
+/**
+ * Facets block
+ *
+ * @since 4.2.0
+ * @package elasticpress
+ */
+
+namespace ElasticPress\Feature\Facets\Types\Meta;
+
+use ElasticPress\Features;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly.
+}
+
+/**
+ * Facets block class
+ */
+class Block {
+	/**
+	 * Hook block funcionality.
+	 */
+	public function setup() {
+		add_action( 'init', [ $this, 'register_block' ] );
+		add_action( 'rest_api_init', [ $this, 'setup_endpoints' ] );
+
+		/** This filter is documented in includes/classes/Feature/Facets/Types/Taxonomy/Block.php */
+		$renderer_class = apply_filters( 'ep_facet_renderer_class', __NAMESPACE__ . '\Renderer', 'meta', 'block' );
+
+		$this->renderer = new $renderer_class();
+	}
+
+	/**
+	 * Setup REST endpoints for the feature.
+	 */
+	public function setup_endpoints() {
+		register_rest_route(
+			'elasticpress/v1',
+			'facets/meta/keys',
+			[
+				'methods'             => 'GET',
+				'permission_callback' => [ $this, 'check_facets_meta_rest_permission' ],
+				'callback'            => [ $this, 'get_rest_registered_metakeys' ],
+			]
+		);
+		register_rest_route(
+			'elasticpress/v1',
+			'facets/meta/block-preview',
+			[
+				'methods'             => 'GET',
+				'permission_callback' => [ $this, 'check_facets_meta_rest_permission' ],
+				'callback'            => [ $this, 'render_block_preview' ],
+				'args'                => [
+					'searchPlaceholder' => [
+						'sanitize_callback' => 'sanitize_text_field',
+					],
+					'facet'             => [
+						'sanitize_callback' => 'sanitize_text_field',
+					],
+					'orderby'           => [
+						'sanitize_callback' => 'sanitize_text_field',
+					],
+					'order'             => [
+						'sanitize_callback' => 'sanitize_text_field',
+					],
+				],
+
+			]
+		);
+	}
+
+	/**
+	 * Check permissions of the /facets/taxonomies REST endpoint.
+	 *
+	 * @return WP_Error|true
+	 */
+	public function check_facets_meta_rest_permission() {
+		if ( ! current_user_can( 'edit_theme_options' ) ) {
+			return new \WP_Error( 'ep_rest_forbidden', esc_html__( 'Sorry, you cannot view this resource.', 'elasticpress' ), array( 'status' => 401 ) );
+		}
+
+		return true;
+	}
+
+	/**
+	 * Return an array of registered meta keys.
+	 *
+	 * @return array
+	 */
+	public function get_rest_registered_metakeys() {
+		$post_indexable = \ElasticPress\Indexables::factory()->get( 'post' );
+
+		try {
+			$meta_keys = $post_indexable->get_distinct_meta_field_keys();
+		} catch ( \Throwable $th ) {
+			$meta_keys = [];
+		}
+
+		return $meta_keys;
+	}
+
+	/**
+	 * Register the block.
+	 */
+	public function register_block() {
+		register_block_type_from_metadata(
+			EP_PATH . 'assets/js/blocks/facets/meta',
+			[
+				'render_callback' => [ $this, 'render_block' ],
+			]
+		);
+	}
+
+	/**
+	 * Render the block.
+	 *
+	 * @param array $attributes Block attributes.
+	 */
+	public function render_block( $attributes ) {
+		$attributes = $this->parse_attributes( $attributes );
+		ob_start();
+		?>
+		<div class="wp-block-elasticpress-facet">
+			<?php $this->renderer->render( [], $attributes ); ?>
+		</div>
+		<?php
+		return ob_get_clean();
+	}
+
+	/**
+	 * Outputs the block preview
+	 *
+	 * @param \WP_REST_Request $request REST request
+	 * @return string
+	 */
+	public function render_block_preview( $request ) {
+		global $wp_query;
+
+		add_filter( 'ep_is_facetable', '__return_true' );
+
+		$search = Features::factory()->get_registered_feature( 'search' );
+
+		$attributes = $this->parse_attributes(
+			[
+				'searchPlaceholder' => $request->get_param( 'searchPlaceholder' ),
+				'facet'             => $request->get_param( 'facet' ),
+				'orderby'           => $request->get_param( 'orderby' ),
+				'order'             => $request->get_param( 'order' ),
+			]
+		);
+
+		add_filter(
+			'ep_facet_meta_fields',
+			function ( $meta_fields ) use ( $attributes ) {
+				$meta_fields = [ $attributes['facet'] ];
+				return $meta_fields;
+			}
+		);
+
+		$wp_query = new \WP_Query(
+			[
+				'post_type' => $search->get_searchable_post_types(),
+				'per_page'  => 1,
+			]
+		);
+
+		ob_start();
+		$this->renderer->render( [], $attributes );
+		$block_content = ob_get_clean();
+
+		if ( empty( $block_content ) ) {
+			if ( empty( $attributes['facet'] ) ) {
+				return esc_html__( 'Preview not available', 'elasticpress' );
+			}
+
+			return sprintf(
+				/* translators: Meta field name */
+				esc_html__( 'Preview for %s not available', 'elasticpress' ),
+				esc_html( $request->get_param( 'facet' ) )
+			);
+		}
+
+		$block_content = preg_replace( '/href="(.*?)"/', 'href="#"', $block_content );
+		return '<div class="wp-block-elasticpress-facet">' . $block_content . '</div>';
+	}
+
+	/**
+	 * Utilitary method to set default attributes.
+	 *
+	 * @param array $attributes Attributes passed
+	 * @return array
+	 */
+	protected function parse_attributes( $attributes ) {
+		$attributes = wp_parse_args(
+			$attributes,
+			[
+				'searchPlaceholder' => esc_html_x( 'Search', 'Facet by meta search placeholder', 'elasticpress' ),
+				'facet'             => '',
+				'orderby'           => 'count',
+				'order'             => 'desc',
+
+			]
+		);
+		if ( empty( $attributes['facet'] ) ) {
+			$registered_metakeys = $this->get_rest_registered_metakeys();
+			if ( ! empty( $registered_metakeys ) ) {
+				$attributes['facet'] = reset( $registered_metakeys );
+			}
+		}
+		return $attributes;
+	}
+}