unsubscribe.php

<?php
/*
	Question2Answer by Gideon Greenspan and contributors
	http://www.question2answer.org/

	Description: Controller for unsubscribe page (unsubscribe link is sent in mass mailings)


	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.

	More about this license: http://www.question2answer.org/license.php
*/

if (!defined('QA_VERSION')) { // don't allow this page to be requested directly from browser
	header('Location: ../../');
	exit;
}

require_once QA_INCLUDE_DIR . 'db/users.php';


// Check we're not using single-sign on integration

if (QA_FINAL_EXTERNAL_USERS)
	qa_fatal_error('User login is handled by external code');


// Check the code and unsubscribe the user if appropriate

$unsubscribed = false;
$loginuserid = qa_get_logged_in_userid();

$incode = trim(qa_get('c')); // trim to prevent passing in blank values to match uninitiated DB rows
$inhandle = qa_get('u');

if (!empty($inhandle)) { // match based on code and handle provided on URL
	$userinfo = qa_db_select_with_pending(qa_db_user_account_selectspec($inhandle, false));

	if (strtolower(trim(@$userinfo['emailcode'])) == strtolower($incode)) {
		qa_db_user_set_flag($userinfo['userid'], QA_USER_FLAGS_NO_MAILINGS, true);
		$unsubscribed = true;
	}
}

if (!$unsubscribed && isset($loginuserid)) { // as a backup, also unsubscribe logged in user
	qa_db_user_set_flag($loginuserid, QA_USER_FLAGS_NO_MAILINGS, true);
	$unsubscribed = true;
}


// Prepare content for theme

$qa_content = qa_content_prepare();

$qa_content['title'] = qa_lang_html('users/unsubscribe_title');

if ($unsubscribed) {
	$qa_content['success'] = strtr(qa_lang_html('users/unsubscribe_complete'), array(
		'^0' => qa_html(qa_opt('site_title')),
		'^1' => '<a href="' . qa_path_html('account') . '">',
		'^2' => '</a>',
	));
} else {
	$qa_content['error'] = qa_insert_login_links(qa_lang_html('users/unsubscribe_wrong_log_in'), 'unsubscribe');
}


return $qa_content;