Tell SearchWP to parse WooCommerce Downloadable Product downloads for document content

searchwp-customizations.php

<?php

// Tell SearchWP to parse WooCommerce Downloadable Product downloads for document content.
// The content will be extracted from downloadable documents where possible and stored
// in SearchWP's index as a Custom Field with a label of "SearchWP WooCommerce Download Content"
add_filter( 'searchwp\entry\data', function( $data, \SearchWP\Entry $entry ) {
	if ( 'post.product' !== $entry->get_source()->get_name() || ! class_exists( 'WC_Product' ) ) {
		return $data;
	}

	$product   = new \WC_Product( $entry->get_id() );
	$downloads = $product->get_downloads();

	if ( empty( $downloads ) ) {
		return $data;
	}

	// WooCommerce only stores a hashed ID, the filename, and the URL to the file
	// but we need to retrieve the Media library ID for each downloadble file.
	$download_content = [];
	$upload_dir = wp_upload_dir();
	foreach ( $downloads as $key => $download ) {
		$relative_file_location = str_replace( trailingslashit( $upload_dir['baseurl'] ), '', $download['data']['file'] );

		// We can use the relative file location to retrieve the post ID we need to parse the PDFs.
		$file_id = get_posts( [
			'post_type'   => 'attachment',
			'post_status' => 'inherit',
			'fields'      => 'ids',
			'meta_query'  => [ [
					'key'   => '_wp_attached_file',
					'value' => $relative_file_location,
			], ],
		] );

		if ( ! empty( $file_id ) ) {
			$download_content[] = \SearchWP\Document::get_content( get_post( $file_id[0] ) );
		}
	}

	$data['meta']['swp_wc_doc_content'] = \SearchWP\Utils::tokenize( $download_content );

	return $data;
}, 20, 2 );

// Add "SearchWP WooCommerce Download Content" as available option.
add_filter( 'searchwp\source\attribute\options', function( $keys, $args ) {
	if ( $args['attribute'] !== 'meta' ) {
		return $keys;
	}

	$content_key = 'swp_wc_doc_content';

	if ( ! in_array(
		$content_key,
		array_map( function( $option ) { return $option->get_value(); }, $keys )
	) ) {
		$keys[] = new \SearchWP\Option( $content_key, 'SearchWP WooCommerce Download Content' );
	}

	return $keys;
}, 20, 2 );