mailgun.php

<?php

	/**
	 * Plugin Name:  Mailgun
	 * Plugin URI:   http://wordpress.org/extend/plugins/mailgun/
	 * Description:  Mailgun integration for WordPress
	 * Version:      1.7.1
	 * Author:       Mailgun
	 * Author URI:   http://www.mailgun.com/
	 * License:      GPLv2 or later
	 * Text Domain:  mailgun
	 * Domain Path:  /languages/.
	 */

	/*
	 * mailgun-wordpress-plugin - Sending mail from Wordpress using Mailgun
	 * Copyright (C) 2016 Mailgun, et al.
	 *
	 * This program is free software; you can redistribute it and/or modify
	 * it under the terms of the GNU General Public License as published by
	 * the Free Software Foundation; either version 2 of the License, or
	 * (at your option) any later version.
	 *
	 * This program is distributed in the hope that it will be useful,
	 * but WITHOUT ANY WARRANTY; without even the implied warranty of
	 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	 * GNU General Public License for more details.
	 *
	 * You should have received a copy of the GNU General Public License along
	 * with this program; if not, write to the Free Software Foundation, Inc.,
	 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	 */

	/**
	 * Entrypoint for the Mailgun plugin. Sets up the mailing "strategy" -
	 * either API or SMTP.
	 *
	 * Registers handlers for later actions and sets up config variables with
	 * Wordpress.
	 */
	class Mailgun
	{
		/**
		 * Setup shared functionality for Admin and Front End.
		 *
		 * @since    0.1
		 */
		public function __construct()
		{
			$this->options = get_option('mailgun');
			$this->plugin_file = __FILE__;
			$this->plugin_basename = plugin_basename($this->plugin_file);

			// Either override the wp_mail function or configure PHPMailer to use the
			// Mailgun SMTP servers
			// When using SMTP, we also need to inject a `wp_mail` filter to make "from" settings
			// work properly. Fixes issues with 1.5.7+
			if ($this->get_option('useAPI') || (defined('MAILGUN_USEAPI') && MAILGUN_USEAPI)):
				if (!function_exists('wp_mail')):
					if (!include dirname(__FILE__) . '/includes/wp-mail-api.php'):
						self::deactivate_and_die(dirname(__FILE__) . '/includes/wp-mail-api.php');
					endif;
				endif;
			else:
				// Using SMTP, include the SMTP filter
				if (!function_exists('mg_smtp_mail_filter')):
					if (!include dirname(__FILE__) . '/includes/wp-mail-smtp.php'):
						self::deactivate_and_die(dirname(__FILE__) . '/includes/wp-mail-smtp.php');
					endif;
				endif;
				add_filter('wp_mail', 'mg_smtp_mail_filter');
				add_action('phpmailer_init', array(&$this, 'phpmailer_init'));
				add_action('wp_mail_failed', 'wp_mail_failed');
			endif;
		}

		/**
		 * Get specific option from the options table.
		 *
		 * @param    string $option  Name of option to be used as array key for retrieving the specific value
		 * @param    array  $options Array to iterate over for specific values
		 * @param    bool   $default False if no options are set
		 *
		 * @return    mixed
		 *
		 * @since    0.1
		 */
		public function get_option($option, $options = null, $default = false)
		{
			if (is_null($options)):
				$options = &$this->options;
			endif;
			if (isset($options[ $option ])):
				return $options[ $option ];
			else:
				return $default;
			endif;
		}

		/**
		 * Hook into phpmailer to override SMTP based configurations
		 * to use the Mailgun SMTP server.
		 *
		 * @param    object $phpmailer The PHPMailer object to modify by reference
		 *
		 * @return    void
		 *
		 * @since    0.1
		 */
		public function phpmailer_init(&$phpmailer)
		{
			$username = (defined('MAILGUN_USERNAME') && MAILGUN_USERNAME) ? MAILGUN_USERNAME : $this->get_option('username');
			$domain = (defined('MAILGUN_DOMAIN') && MAILGUN_DOMAIN) ? MAILGUN_DOMAIN : $this->get_option('domain');
			$username = preg_replace('/@.+$/', '', $username) . "@{$domain}";
			$secure = (defined('MAILGUN_SECURE') && MAILGUN_SECURE) ? MAILGUN_SECURE : $this->get_option('secure');
			$sectype = (defined('MAILGUN_SECTYPE') && MAILGUN_SECTYPE) ? MAILGUN_SECTYPE : $this->get_option('sectype');
			$password = (defined('MAILGUN_PASSWORD') && MAILGUN_PASSWORD) ? MAILGUN_PASSWORD : $this->get_option('password');
			$region = (defined('MAILGUN_REGION') && MAILGUN_REGION) ? MAILGUN_REGION : $this->get_option('region');

			$smtp_endpoint = mg_smtp_get_region($region);
			$smtp_endpoint = (bool) $smtp_endpoint ? $smtp_endpoint : 'smtp.mailgun.org';

			$phpmailer->Mailer = 'smtp';
			$phpmailer->Host = $smtp_endpoint;

			if ('ssl' === $sectype):
				// For SSL-only connections, use 465
				$phpmailer->Port = 465;
			else:
				// Otherwise, use 587.
				$phpmailer->Port = 587;
			endif;

			$phpmailer->SMTPAuth = true;
			$phpmailer->Username = $username;
			$phpmailer->Password = $password;

			$phpmailer->SMTPSecure = (bool) $secure ? $sectype : '';
			// Without this line... wp_mail for SMTP-only will always return false. But why? :(
			$phpmailer->Debugoutput = 'mg_smtp_debug_output';
			$phpmailer->SMTPDebug = 2;

			// Emit some logging for SMTP connection
			mg_smtp_debug_output(sprintf("PHPMailer configured to send via %s:%s", $phpmailer->Host, $phpmailer->Port),
				'DEBUG');
		}

		/**
		 * Deactivate this plugin and die.
		 * Deactivate the plugin when files critical to it's operation cannot be loaded
		 *
		 * @param    $file    Files critical to plugin functionality
		 *
		 * @return    void
		 *
		 * @since    0.1
		 */
		public function deactivate_and_die($file)
		{
			load_plugin_textdomain('mailgun', false, 'mailgun/languages');
			$message = sprintf(__('Mailgun has been automatically deactivated because the file <strong>%s</strong> is missing. Please reinstall the plugin and reactivate.'),
				$file);
			if (!function_exists('deactivate_plugins')):
				include ABSPATH . 'wp-admin/includes/plugin.php';
			endif;
			deactivate_plugins(__FILE__);
			wp_die($message);
		}

		/**
		 * Make a Mailgun api call.
		 *
		 * @param    string $uri    The endpoint for the Mailgun API
		 * @param    array  $params Array of parameters passed to the API
		 * @param    string $method The form request type
		 *
		 * @return    array
		 *
		 * @since    0.1
		 */
		public function api_call($uri, $params = array(), $method = 'POST')
		{
			$options = get_option('mailgun');
			$getRegion = (defined('MAILGUN_REGION') && MAILGUN_REGION) ? MAILGUN_REGION : $options[ 'region' ];
			$apiKey = (defined('MAILGUN_APIKEY') && MAILGUN_APIKEY) ? MAILGUN_APIKEY : $options[ 'apiKey' ];
			$domain = (defined('MAILGUN_DOMAIN') && MAILGUN_DOMAIN) ? MAILGUN_DOMAIN : $options[ 'domain' ];

			$region = mg_api_get_region($getRegion);
			$this->api_endpoint = ($region) ? $region : 'https://api.mailgun.net/v3/';

			$time = time();
			$url = $this->api_endpoint . $uri;
			$headers = array(
				'Authorization' => 'Basic ' . base64_encode("api:{$apiKey}"),
			);

			switch ($method) {
				case 'GET':
					$params[ 'sess' ] = '';
					$querystring = http_build_query($params);
					$url = $url . '?' . $querystring;
					$params = '';
					break;
				case 'POST':
				case 'PUT':
				case 'DELETE':
					$params[ 'sess' ] = '';
					$params[ 'time' ] = $time;
					$params[ 'hash' ] = sha1(date('U'));
					break;
			}

			// make the request
			$args = array(
				'method' => $method,
				'body' => $params,
				'headers' => $headers,
				'sslverify' => true,
			);

			// make the remote request
			$result = wp_remote_request($url, $args);
			if (!is_wp_error($result)):
				return $result[ 'body' ];
			else:
				return $result->get_error_message();
			endif;
		}

		/**
		 * Get account associated lists.
		 *
		 * @return    array
		 *
		 * @since    0.1
		 */
		public function get_lists()
		{
			$results = array();

			$lists_json = $this->api_call('lists', array(), 'GET');
			$lists_arr = json_decode($lists_json, true);
			if (isset($lists_arr[ 'items' ]) && !empty($lists_arr[ 'items' ])):
				$results = $lists_arr[ 'items' ];
			endif;

			return $results;
		}

		/**
		 * Handle add list ajax post.
		 *
		 * @return    string    json
		 *
		 * @since    0.1
		 */
		public function add_list()
		{
			$response = array();

			$name = isset($_POST[ 'name' ]) ? $_POST[ 'name' ] : null;
			$email = isset($_POST[ 'email' ]) ? $_POST[ 'email' ] : null;

			$list_addresses = $_POST[ 'addresses' ];

			if (!empty($list_addresses)):
				foreach ($list_addresses as $address => $val):
					$response[] = $this->api_call(
						"lists/{$address}/members",
						array(
							'address' => $email,
							'name' => $name,
						)
					);
				endforeach;

				echo json_encode(array('status' => 200, 'message' => 'Thank you!'));
			else:
				echo json_encode(array(
					'status' => 500,
					'message' => 'Uh oh. We weren\'t able to add you to the list' . count($list_addresses) ? 's.' : '. Please try again.'
				));
			endif;

			wp_die();
		}

		/**
		 * Frontend List Form.
		 *
		 * @param    string $list_address Mailgun address list id
		 * @param    array  $args         widget arguments
		 * @param    array  $instance     widget instance params
		 *
		 * @since    0.1
		 */
		public function list_form($list_address, $args = array(), $instance = array())
		{
			$widget_class_id = "mailgun-list-widget-{$args['widget_id']}";
			$form_class_id = "list-form-{$args['widget_id']}";

			// List addresses from the plugin config
			$list_addresses = array_map('trim', explode(',', $list_address));

			// All list info from the API; used for list info when more than one list is available to subscribe to
			$all_list_addresses = $this->get_lists();
		?>
			<div class="mailgun-list-widget-front <?php echo $widget_class_id; ?> widget">
				<form class="list-form <?php echo $form_class_id; ?>">
					<div class="mailgun-list-widget-inputs">
						<?php if (isset($args[ 'list_title' ])): ?>
							<div class="mailgun-list-title">
								<h4 class="widget-title">
									<span><?php echo $args[ 'list_title' ]; ?></span>
								</h4>
							</div>
						<?php endif; ?>
						<?php if (isset($args[ 'list_description' ])): ?>
							<div class="mailgun-list-description">
								<p class="widget-description">
									<span><?php echo $args[ 'list_description' ]; ?></span>
								</p>
							</div>
						<?php endif; ?>
						<?php if (isset($args[ 'collect_name' ]) && intval($args[ 'collect_name' ]) === 1): ?>
							<p class="mailgun-list-widget-name">
								<strong>Name:</strong>
								<input type="text" name="name"/>
							</p>
						<?php endif; ?>
						<p class="mailgun-list-widget-email">
							<strong>Email:</strong>
							<input type="text" name="email"/>
						</p>
					</div>

					<?php if (count($list_addresses) > '1'): ?>
						<ul class="mailgun-lists" style="list-style: none;">
							<?php
								foreach ($all_list_addresses as $la):
									if (!in_array($la[ 'address' ], $list_addresses)):
										continue;
									endif;
							?>
									<li>
										<input type="checkbox" class="mailgun-list-name"
											   name="addresses[<?php echo $la[ 'address' ]; ?>]"/> <?php echo $la[ 'name' ]; ?>
									</li>
							<?php endforeach; ?>
						</ul>
					<?php else: ?>
						<input type="hidden" name="addresses[<?php echo $list_addresses[ 0 ]; ?>]" value="on"/>
					<?php endif; ?>

					<input class="mailgun-list-submit-button" data-form-id="<?php echo $form_class_id; ?>" type="button"
						   value="Subscribe"/>
					<input type="hidden" name="mailgun-submission" value="1"/>

				</form>
				<div class="widget-list-panel result-panel" style="display:none;">
					<span>Thank you for subscribing!</span>
				</div>
			</div>

			<script>
              jQuery(document).ready(function () {

                jQuery('.mailgun-list-submit-button').on('click', function () {

                  var form_id = jQuery(this).data('form-id')

                  if (jQuery('.mailgun-list-name').length > 0 && jQuery('.' + form_id + ' .mailgun-list-name:checked').length < 1) {
                    alert('Please select a list to subscribe to.')
                    return
                  }

                  if (jQuery('.' + form_id + ' .mailgun-list-widget-name input') && jQuery('.' + form_id + ' .mailgun-list-widget-name input').val() === '') {
                    alert('Please enter your subscription name.')
                    return
                  }

                  if (jQuery('.' + form_id + ' .mailgun-list-widget-email input').val() === '') {
                    alert('Please enter your subscription email.')
                    return
                  }

                  jQuery.ajax({
                    url: '<?php echo admin_url('admin-ajax.php?action=add_list'); ?>',
                    action: 'add_list',
                    type: 'post',
                    dataType: 'json',
                    data: jQuery('.' + form_id + '').serialize(),
                    success: function (data) {

                      data_msg = data.message
                      already_exists = false
                      if (data_msg !== undefined) {
                        already_exists = data_msg.indexOf('Address already exists') > -1
                      }

                      // success
                      if ((data.status === 200)) {
                        jQuery('.<?php echo $widget_class_id; ?> .widget-list-panel').css('display', 'none')
                        jQuery('.<?php echo $widget_class_id; ?> .list-form').css('display', 'none')
                        jQuery('.<?php echo $widget_class_id; ?> .result-panel').css('display', 'block')
                        // error
                      } else {
                        alert(data_msg)
                      }
                    }
                  })
                })
              })
			</script>

			<?php
		}

		/**
		 * Initialize List Form.
		 *
		 * @param    array $atts Form attributes
		 *
		 * @return    string
		 *
		 * @since    0.1
		 */
		public function build_list_form($atts)
		{
			if (isset($atts[ 'id' ]) && $atts[ 'id' ] != ''):
				$args[ 'widget_id' ] = md5(rand(10000, 99999) + $atts[ 'id' ]);

				if (isset($atts[ 'collect_name' ])):
					$args[ 'collect_name' ] = true;
				endif;

				if (isset($atts[ 'title' ])):
					$args[ 'list_title' ] = $atts[ 'title' ];
				endif;

				if (isset($atts[ 'description' ])):
					$args[ 'list_description' ] = $atts[ 'description' ];
				endif;

				ob_start();
				$this->list_form($atts[ 'id' ], $args);
				$output_string = ob_get_contents();
				ob_end_clean();

				return $output_string;
			else:
				?>
				<span>Mailgun list ID needed to render form!</span>
				<br/>
				<strong>Example :</strong> [mailgun id="[your list id]"]
			<?php
			endif;
		}

		/**
		 * Initialize List Widget.
		 *
		 * @since    0.1
		 */
		public function load_list_widget()
		{
			register_widget('list_widget');
			add_shortcode('mailgun', array(&$this, 'build_list_form'));
		}
	}

	$mailgun = new Mailgun();

	if (@include dirname(__FILE__) . '/includes/widget.php'):
		add_action('widgets_init', array(&$mailgun, 'load_list_widget'));
		add_action('wp_ajax_nopriv_add_list', array(&$mailgun, 'add_list'));
		add_action('wp_ajax_add_list', array(&$mailgun, 'add_list'));
	endif;

	if (is_admin()):
		if (@include dirname(__FILE__) . '/includes/admin.php'):
			$mailgunAdmin = new MailgunAdmin();
		else:
			Mailgun::deactivate_and_die(dirname(__FILE__) . '/includes/admin.php');
		endif;
	endif;