Replace affiliate links with links to VigLink.

replace-affiliate-link-with-a-viglink-link.php

<?php

/**
 * Replace affiliate links with links to VigLink.
 *
 * There are limitations to this method. Not all products contain the necessary data
 * to redirect to VigLink. If the necessary data is not available, the affiliate network
 * affiliate link will be returned instead. Therefore it's a good idea to enter your
 * affiliate ID for all networks just in case here WordPress Admin Area >Datafeedr API > Networks
 *
 * This works best with most (but not all) products from the following affiliate networks:
 *
 * AdRecord, Adtraction, Affiliate4You, AffiliateWindow, APD, Belboon, BettyMills, ClixGalore,
 * Commission Junction, Double.net, Impact Radius, LinkConnector, LinkShare (Rakuten), Optimise,
 * Partner-ads, PepperJam, TradeDoubler, TradeTracker, Webgains and Zanox.
 *
 * To use this code you must add your VigLink API key at the top of this function.
 *
 * Replace 88ac2a40e081e283ac504d1789d398ac with your VigLink API key.
 *
 * Your VigLink API key can be found on your account page: https://publishers.viglink.com/account
 *
 * @param string $url Description.
 * @param array $product An array of the current Datafeedr product's information.
 * @param string $affiliate_id Affiliate ID for current product.
 *
 * @return string URL.
 *
 */
add_filter( 'dfrapi_before_affiliate_id_insertion', 'mycode_generate_viglink_link', 20, 3 );
function mycode_generate_viglink_link( $url, $product, $affiliate_id ) {

	/**
	 * Add your VigLink API key here.
	 * Your VigLink API key can be found on your account page:
	 * @link https://publishers.viglink.com/account
	 * Replace 88ac2a40e081e283ac504d1789d398ac with your unique VigLink API key.
	 */
	$viglink_key = '88ac2a40e081e283ac504d1789d398ac';

	/* Stop Editing */

	$viglink_url = 'http://redirect.viglink.com/';
	$key         = 'direct_url';

	if ( ! isset( $product[ $key ] ) ) {
		return $url;
	}

	$direct_url = $product[ $key ];

	if ( substr( $direct_url, 0, 4 ) !== "http" ) {
		$direct_url = 'http%3A%2F%2F' . $direct_url;
	}

	$url = add_query_arg( array(
		'u'   => $direct_url,
		'key' => $viglink_key,
	), $viglink_url );

	return $url;
}