Woocommerce - External Links New Tab for Affiliates

functions.php

<?php

/** 
 * @snippet       Woocommerce - External Links New Tab for Affiliates
 * @sourcecode    https://gist.github.com/statickidz/72be96dca9cd39331f1fcbdc59392f5b
 * @author        Adrián Barrio Andrés (statickidz.com)
 */

/** 
 * Redirect WC external products single to his affiliate link
 */
add_action( 'template_redirect', 'skidz_redirect_external_products' );
function skidz_redirect_external_products() {
	global $post;

	if ( is_singular( 'product' ) && ! empty( $post ) && ( $product = wc_get_product( $post ) ) && $product->is_type( 'external' ) ) {
		wp_redirect( $product->get_product_url() );
		exit;
	}
}

/** 
 * Update WC external product link to his affiliate link
 */
add_filter( 'post_type_link', 'skidz_update_external_product_link', 10, 2 );
function skidz_update_external_product_link( $url, $post ) 
{
	if ( ! empty( $post ) && ( $product = wc_get_product( $post ) ) && $product->is_type( 'external' ) ) {
    	return $product->get_product_url();
	}
	return $url;
}


/** 
 * Replace WC external products blocks links to open in new tab and no refollow
 */
add_filter( 'woocommerce_blocks_product_grid_item_html', 'skidz_product_block', 10, 3 );
function skidz_product_block( $html, $data, $product ) {
	$html = str_replace('rel="nofollow"', '', $html);
	$html = str_replace('target="_blank"', '', $html);
	$html = str_replace('<a', '<a target="_blank" rel="nofollow"', $html);
    return $html;
}

style.css

.add_to_cart_button {
  position: relative;
  padding-left: 47px;
  background: #f0c14b;
  background: linear-gradient(to bottom, #f7dfa5, #f0c14b) repeat scroll 0 0 rgba(0, 0, 0, 0);
  color: #111 !important;
  cursor: pointer;
  font-size: 15px;
  font-weight: 400;
  line-height: 20px;
  text-align: center;
  text-decoration: none !important;
}

.add_to_cart_button:before {
  position: absolute;
  content: '';
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-repeat: no-repeat;
  background-size: 18px 18px;
  background-position: 20px center;
  box-sizing: border-box;
  background-image: url(https://mk0getaawprm95y8pmm9.kinstacdn.com/wp-content/plugins/aawp/public/assets/img/icon-amazon-black.svg);
}