Mailing-Hooks.php

<?php
/**
 * CiviCRM Mailing_Hooks class.
 *
 * @since 0.1
 */

namespace CiviCRM_WP_REST\Civi;

class Mailing_Hooks {

	/**
	 * Mailing Url endpoint.
	 *
	 * @since 0.1
	 * @var string
	 */
	public $url_endpoint;

	/**
	 * Mailing Open endpoint.
	 *
	 * @since 0.1
	 * @var string
	 */
	public $open_endpoint;

	/**
	 * Constructor.
	 *
	 * @since 0.1
	 */
	public function __construct() {

		$this->url_endpoint = rest_url( 'civicrm/v3/url' );

		$this->open_endpoint = rest_url( 'civicrm/v3/open' );

	}

	/**
	 * Register hooks.
	 *
	 * @since 0.1
	 */
	public function register_hooks() {

		add_filter( 'civicrm_alterMailParams', [ $this, 'do_mailing_urls' ], 10, 2 );

	}

	/**
	 * Filters the mailing html and replaces calls to 'extern/url.php' and
	 * 'extern/open.php' with their REST counterparts 'civicrm/v3/url' and 'civicrm/v3/open'.
	 *
	 * @uses 'civicrm_alterMailParams'
	 *
	 * @since 0.1
	 * @param array &$params Mail params
	 * @param string $context The Context
	 * @return array $params The filtered Mail params
	 */
	public function do_mailing_urls( &$params, $context ) {

		if ( $context == 'civimail' ) {

			$params['html'] = $this->replace_html_mailing_tracking_urls( $params['html'] );

			$params['text'] = $this->replace_text_mailing_tracking_urls( $params['text'] );