EricBusch/replace-wordpress-search-results-with-results-from-datafeedr-api.php

## replace-wordpress-search-results-with-results-from-datafeedr-api.php
<?php

/**
 * THIS IS THE ONLY REQUIRED MODIFICATION!!!
 *
 * 1. GO HERE WordPress Admin Area > Pages > Add New
 * 2. CREATE A NEW PAGE TO BE USED FOR DISPLAYING SEARCH RESULTS.
 * 3. REPLACE "123" BELOW WITH THE ID OF YOUR NEW PAGE.
 *
 * Return the ID of the page to be used to display the search results.
 *
 * @return integer Page ID.
 */
function mycode_custom_search_results_page_id() {
	return 123;
}

/**
 * Redirects WordPress searches to our new Search Page.
 *
 * @see mycode_custom_search_results_page_id()
 */
add_action( 'template_redirect', 'mycode_custom_search_redirect' );
function mycode_custom_search_redirect() {

	$page_id = mycode_custom_search_results_page_id();

	if ( ! is_search() ) {
		return;
	}

	if ( ! isset( $_GET['s'] ) || empty( $_GET['s'] ) ) {
		return;
	}

	if ( ! function_exists( 'dfrapi_api' ) ) {
		return;
	}

	if ( mycode_visitor_is_bot() ) {
		return;
	}

	$url = add_query_arg( array(
		'query' => urlencode( stripslashes_deep( $_GET['s'] ) ),
	), get_permalink( $page_id ) );

	wp_redirect( $url );
	exit();
}

/**
 * Replaces the $content on the Search Page with an WooCommerce search
 * form and the results of our search.
 *
 * @see mycode_custom_search_results_page_id()
 *
 * @param string $content The content of the Search Page.
 *
 * @return string Updated page content.
 */
add_filter( 'the_content', 'mycode_custom_search_results' );
function mycode_custom_search_results( $content ) {

	if ( mycode_visitor_is_bot() ) {
		return $content;
	}

	$page_id = mycode_custom_search_results_page_id();

	if ( ! is_page( $page_id ) ) {
		return $content;
	}

	if ( ! in_the_loop() ) {
		return $content;
	}

	if ( ! is_singular() ) {
		return $content;
	}

	if ( ! is_main_query() ) {
		return $content;
	}

	if ( ! function_exists( 'dfrapi_api' ) ) {
		return $content;
	}

	$original_query = ( isset( $_GET['query'] ) ) ? stripslashes_deep( $_GET['query'] ) : '';

	$filtered_query = mycode_custom_search_query_filter( $original_query );

	$form = mycode_custom_search_form( $filtered_query ) . '<hr />';

	remove_filter( current_filter(), __FUNCTION__ );

	if ( empty( $filtered_query ) ) {
		$content .= $form;
		$content .= 'Please enter your search terms.';

		return $content;
	}

	$products = mycode_custom_search_query( $filtered_query );

	if ( is_wp_error( $products ) ) {
		$content .= $form;
		$content .= 'Error retrieving results from the product API. Please try again.';

		return $content;
	}

	if ( empty( $products ) ) {
		$content .= $form;
		$content .= 'No results match your search.';

		return $content;
	}

	$content .= $form . mycode_custom_search_output( $products );

	return $content;
}

/**
 * Add our current search query to the form's <input> value attribute.
 *
 * @see mycode_custom_search_query_filter(), get_product_search_form()
 *
 * @param string $query Query string.
 *
 * @return string Updated $form HTML.
 */
function mycode_custom_search_form( $query ) {
	$form = get_search_form( false );
	$form = str_replace( 'value=""', 'value="' . esc_attr( $query ) . '"', $form );

	return $form;
}

/**
 * Outputs an array of $products into HTML.
 *
 * @param array $products An array of $products returned by the Datafeedr API.
 *
 * @return string HTML of list of products.
 */
function mycode_custom_search_output( array $products ) {

	$html = '';

	foreach ( $products as $product ) {

		$url    = dfrapi_url( $product );
		$name   = ( isset( $product['name'] ) ) ? esc_html( $product['name'] ) : 'Product name currently not available';
		$desc   = ( isset( $product['description'] ) ) ? esc_html( $product['description'] ) : 'Product description currently not available';
		$sale   = ( '1' == $product['onsale'] ) ? true : false;
		$img    = ( isset( $product['image'] ) ) ? '<img src="' . $product['image'] . '" style="max-height:70px;float:left;margin: 0 10px 10px 0" />' : '';
		$sign   = ( isset( $product['currency'] ) ) ? dfrapi_currency_code_to_sign( $product['currency'] ) : '$';
		$fprice = ( isset( $product['finalprice'] ) ) ? $sign . dfrapi_int_to_price( $product['finalprice'] ) : 'n/a';
		$rprice = ( isset( $product['price'] ) ) ? $sign . dfrapi_int_to_price( $product['price'] ) : 'n/a';
		$price  = ( $sale ) ? '<del>' . $rprice . '</del> <strong>' . $fprice . '</strong>' : '<strong>' . $fprice . '</strong>';
		$disc   = ( $sale ) ? ' <span style="font-weight: bold; color: #FF8000">Save ' . $product['salediscount'] . '%</span>' : '';

		$html .= '<p>';
		$html .= '<a href="' . $url . '" target="_blank">' . $img . $name . '</a> ';
		$html .= $price . $disc;
		$html .= '<br />';
		$html .= wp_trim_words( $desc, 15, '&hellip;' );
		$html .= '</p>';
		$html .= '<hr />';
	}

	return $html;
}

/**
 * Queries the Datafeedr API for the given query.
 *
 * @see dfrapi_api()
 *
 * @param string $query Query string.
 *
 * @return array|WP_Error An array of $products or WP_Error if an error occurred.
 */
function mycode_custom_search_query( $query ) {

	$api = dfrapi_api();

	$merchants    = (array) get_option( 'dfrapi_merchants' );
	$merchant_ids = implode( ',', $merchants['ids'] );

	try {
		$search = $api->searchRequest();
		$search->addFilter( 'any LIKE ' . $query );
		$search->addFilter( 'merchant_id IN ' . $merchant_ids );
//		$search->addFilter( 'onsale = 1' );
//		$search->addSort( '+finalprice' );
//		$search->excludeDuplicates( 'image|name merchant_id' );
		$search->setLimit( '100' );
		$products = $search->execute();

		return $products;
	} catch ( Exception $e ) {
		return new WP_Error( 'failed_api_search', 'The search failed.', $e );
	}
}

/**
 * Modifies the search query to make it ready to be passed to the Datafeedr API "any" field.
 *
 * @param string $query Query string.
 *
 * @return string Filtered $query string.
 */
function mycode_custom_search_query_filter( $query ) {
	return preg_replace( '/[^\s\d\|\"\=\-\p{L}]/u', '', trim( $query ) );
}

/**
 * Returns true if current User Agent is in the $bots array. Else returns false.
 *
 * @link https://github.com/monperrus/crawler-user-agents/
 *
 * @return boolean True if visitor is bot. Else false.
 */
function mycode_visitor_is_bot() {

	$user_agent = ( isset( $_SERVER['HTTP_USER_AGENT'] ) ) ? $_SERVER['HTTP_USER_AGENT'] : '';

	$bots = array(
		'360Spider',
		'A6-Indexer',
		'Aboundex',
		'acoonbot',
		'adbeat_bot',
		'AddThis',
		'Adidxbot',
		'ADmantX',
		'AdsBot',
		'AdvBot',
		'ahrefsbot',
		'aihitbot',
		'AISearchBot',
		'antibot',
		'Applebot',
		'arabot',
		'archive.org_bot',
		'backlinkcrawler',
		'baiduspider',
		'betaBot',
		'bibnum.bnf',
		'biglotron',
		'bingbot',
		'BingPreview',
		'binlar',
		'blekkobot',
		'blexbot',
		'bnf.fr_bot',
		'brainobot',
		'BUbiNG',
		'buzzbot',
		'CapsuleChecker',
		'careerbot',
		'CC Metadata Scaper',
		'ccbot',
		'changedetection',
		'citeseerxbot',
		'Cliqzbot',
		'coccoc',
		'collection@infegy.com',
		'content crawler spider',
		'contxbot',
		'convera',
		'crawler4j',
		'CrystalSemanticsBot',
		'cXensebot',
		'CyberPatrol',
		'datagnionbot',
		'deadlinkchecker',
		'DeuSu',
		'discobot',
		'Domain Re-Animator Bot',
		'domaincrawler',
		'dotbot',
		'drupact',
		'DuckDuckBot',
		'ec2linkfinder',
		'edisterbot',
		'elisabot',
		'Embedly',
		'europarchive.org',
		'exabot',
		'ezooms',
		'facebook',
		'facebookexternalhit',
		'Facebot',
		'FAST Enterprise Crawler',
		'FAST-WebCrawler',
		'findlink',
		'findthatfile',
		'findxbot',
		'fluffy',
		'fr-crawler',
		'g00g1e.net',
		'gigablast',
		'gigabot',
		'GingerCrawler',
		'Gluten Free Crawler',
		'gnam gnam spider',
		'Google-Adwords-Instant',
		'Googlebot',
		'GrapeshotCrawler',
		'grub.org',
		'gslfbot',
		'heritrix',
		'httpunit',
		'httrack',
		'ia_archiver',
		'ichiro',
		'integromedb',
		'intelium_bot',
		'InterfaxScanBot',
		'ip-web-crawler.com',
		'ips-agent',
		'iskanie',
		'IstellaBot',
		'it2media-domain-crawler',
		'java',
		'jyxobot',
		'lb-spider',
		'libwww',
		'Linguee Bot',
		'linkdex',
		'linkdexbot',
		'lipperhey',
		'Livelapbot',
		'lssbot',
		'lssrocketcrawler',
		'ltx71',
		'Mediapartners-Google',
		'MegaIndex',
		'memorybot',
		'MetaURI',
		'MJ12bot',
		'mlbot',
		'MojeekBot',
		'msnbot',
		'msrbot',
		'NerdByNature.Bot',
		'nerdybot',
		'netEstate NE Crawler',
		'netresearchserver',
		'ngbot',
		'niki-bot',
		'nutch',
		'OpenHoseBot',
		'openindexspider',
		'OrangeBot',
		'page2rss',
		'panscient',
		'phpcrawl',
		'pinterest.com/bot',
		'postrank',
		'proximic',
		'psbot',
		'purebot',
		'Python-urllib',
		'Qwantify',
		'RankActiveLinkBot',
		'redditbot',
		'RetrevoPageAnalyzer',
		'rogerbot',
		'RU_Bot',
		'SafeDNSBot',
		'SafeSearch microdata crawler',
		'Scanbot',
		'Scrapy',
		'Screaming Frog SEO Spider',
		'scribdbot',
		'seekbot',
		'SemanticScholarBot',
		'SemrushBot',
		'seokicks-robot',
		'seznambot',
		'SimpleCrawler',
		'sistrix crawler',
		'sitebot',
		'siteexplorer.info',
		'SkypeUriPreview',
		'Slack-ImgProxy',
		'Slackbot',
		'slurp',
		'smtbot',
		'sogou',
		'Sonic',
		'spbot',
		'speedy',
		'summify',
		'Sysomos',
		'tagoobot',
		'teoma',
		'toplistbot',
		'Trove',
		'turnitinbot',
		'TweetmemeBot',
		'twengabot',
		'Twitterbot',
		'urlappendbot',
		'UsineNouvelleCrawler',
		'Veoozbot',
		'voilabot',
		'Voyager',
		'wbsearchbot',
		'web-archive-net.com.bot',
		'webcompanycrawler',
		'webcrawler',
		'webmon',
		'WeSEE:Search',
		'WhatsApp',
		'wocbot',
		'woriobot',
		'wotbox',
		'xovibot',
		'y!j-asr',
		'yacybot',
		'yandex.combots',
		'yandexbot',
		'yanga',
		'yeti',
		'yoozBot',
		'ZoomBot',
	);

	foreach ( $bots as $bot ) {
		if ( stripos( $user_agent, $bot ) !== false ) {
			return true;
		}
	}

	return false;
}