[Debug Email] Simple script to change all email recipients for debugging / development purpose #wordpress #email #development-tools

debug-email.php

<?php
/**
 * Plugin Name:         Debug Email
 * Description:         Simple script to change all email recipients for debugging / development purpose
 * Version:             0.1
 * Author:              Lafif Astahdziq
 * Author URI:          https://lafif.me
 */

add_action( 'init', 'test_send_email' );
function test_send_email(){
    if(!isset($_GET['send_email'])){
        return;
    }

    $email = !empty($_GET['send_email']) ? $_GET['send_email'] : '[email protected]';

    $x = wp_mail( $email, 'Subject', 'message' );

    var_dump($x);
    exit();
}

add_action( 'wp_ajax_save_debug_email', 'save_debug_email' );
function save_debug_email(){

	$response = array(
		'success' => false,
		'message' => 'Failed to save email debug',
	);

	try {
		if(!isset($_POST['email']) || !is_email( $_POST['email'] ))
			throw new Exception('Email not valid');
			
		if(!isset($_POST['nonce']) || !wp_verify_nonce( $_POST['nonce'], 'save_debug_email' ))
			throw new Exception('You are not allowed.');
			

		$save = update_option( 'debug_email', sanitize_email( $_POST['email'] ) );
		if($save === false)
			throw new Exception('Failed to save.');

		$response = array(
			'success' => true,
			'message' => sprintf('Email Debug: %s', sanitize_email( $_POST['email'] ) ),
		);
	} catch (Exception $e) {
		$response['message'] = $e->getMessage();
	}

	wp_send_json( $response );
}

add_filter( 'wp_mail', 'change_email_args', 100, 1 );
function change_email_args($args){

	$debug_email = get_option( 'debug_email', '' );
	if(empty($debug_email)){
		return $args;
	}

    $to = $args['to'];

    $args['to'] = $debug_email;
    $args['subject'] = '['.$to.'] ' . $args['subject'];
    
    return $args;
}

add_action('admin_bar_menu', 'add_toolbar_items', 100);
function add_toolbar_items($admin_bar){
	if(!current_user_can( 'manage_options' ))
		return;

	$debug_email = get_option( 'debug_email', '' );
	$title = !empty($debug_email) ? sprintf('Email Debug: %s', $debug_email) : 'Debug email disabled: Click to set';
    $admin_bar->add_menu( array(
        'id'    => 'debug-email-recipient',
        'title' => $title,
        'href'  => '#',
        'meta'  => array(
            'title' => !empty($debug_email) ? sprintf('All email will be sent to: %s (Click to change)', $debug_email) : 'Click to change',
        ),
    ));

    ?>
    <style>
	#wp-admin-bar-debug-email-recipient a.state-input {
		display: block;
	    overflow: hidden;
	    padding: 0px;
	    width: 100%;
	}
	#wp-admin-bar-debug-email-recipient a.state-input button {
		background: #d1500a;
	    color: #fff;
	    padding: 0 5px;
	    cursor: pointer;
	}
	</style>
	<script>
		(function($){
			var DebugEmail = {
				form_open: false,
				text: $('#wp-admin-bar-debug-email-recipient a').html(),
				init: function(){
					$(document).on('click', '#wp-admin-bar-debug-email-recipient a', function(e){
						e.preventDefault();

						if($(this).hasClass('state-input')){
							return false;
						}

						DebugEmail.form_open = true;
						DebugEmail.text = $(this).html();

						// alert(DebugEmail.text);
						$(this).addClass('state-input').html('<input type="text" id="debug_email" placeholder="Your email.."><button id="save_debug_email">Save</button>');
					});

					$(document).on('click', '#save_debug_email', function(e){
						e.preventDefault();
						
						$(this).text('Saving..');

						$.ajax({
			                type: 'POST',
			                data: {
			                	action: 'save_debug_email',
			                	nonce: '<?php echo wp_create_nonce( 'save_debug_email' ); ?>',
			                	email: $('#debug_email').val()
			                },
			                dataType: 'json',
			                url: '<?php echo admin_url( 'admin-ajax.php' ); ?>',
			                xhrFields: {
			                    withCredentials: true
			                },
			                success: function (response) {

			                    // alert('ok');
			                    // console.log(response);

			                    if(response.success){
			                    	DebugEmail.text = response.message;
			                    } else {
			                    	alert(response.message);
			                    }
			                },
			                complete: function(){
			                	$('#wp-admin-bar-debug-email-recipient a').removeClass('state-input').html(DebugEmail.text);
			                	DebugEmail.form_open = false;
			                }
			            });
					});

					$(document).click(function (e) {
					    var container = $('#wp-admin-bar-debug-email-recipient');
					    if ( DebugEmail.form_open 
					    	&& !container.is(e.target) // if the target of the click isn't the container...
					        && container.has(e.target).length === 0) // ... nor a descendant of the container
					    {
					        container.find('a').removeClass('state-input').html(DebugEmail.text);
					        DebugEmail.form_open = false;
					    }
					});
				}
			};

			DebugEmail.init();
		})(jQuery);
	</script>
    <?php
}