function check_account_email($email)
{
    $result = array('error' => false, 'message' => '');
    // Caution: empty email isn't counted as an error in this function.
    // Check for empty value separately.
    if (!strlen($email)) {
        return $result;
    }
    if (!valid_email($email) || !validate_email($email)) {
        $result['message'] .= t('Not a valid email address') . EOL;
    } elseif (!allowed_email($email)) {
        $result['message'] = t('Your email domain is not among those allowed on this site');
    } else {
        $r = q("select account_email from account where account_email = '%s' limit 1", dbesc($email));
        if ($r) {
            $result['message'] .= t('Your email address is already registered at this site.');
        }
    }
    if ($result['message']) {
        $result['error'] = true;
    }
    $arr = array('email' => $email, 'result' => $result);
    call_hooks('check_account_email', $arr);
    return $arr['result'];
}

/**
 * Validate Registration Form
 * Registration Form Validation steps:
 * - check that no fields are empty.
 * - check that the e-mail is valid.
 * - check that the username is valid.
 * - check that both repeated user passwords match.
 * - check that the user password is valid.
 * @param string $user_email User email provided by the user.
 * @param string $user_name Username provided by the user.
 * @param string $user_password Password provided by the user.
 * @param string $user_password2 Repeated password provided by the user.
 * @return integer The function result code (for error handling)
 **/
function validate_registration_form($user_email, $user_name, $user_password, $user_password2)
{
    $validation_result = SUCCESS_NO_ERROR;
    if (check_empty_form([$user_email, $user_name, $user_password, $user_password2]) == TRUE) {
        $validation_result = VALIDATE_REGISTER_EMPTY_FORM;
        return $validation_result;
    }
    // check if e-mail address is valid.
    $validation_result = validate_email($user_email);
    if ($validation_result != SUCCESS_NO_ERROR) {
        return $validation_result;
    }
    // check if user name is valid
    $validation_result = validate_username($user_name);
    if ($validation_result != SUCCESS_NO_ERROR) {
        return $validation_result;
    }
    // check if our passwords match.
    $validation_result = check_password_match($user_password, $user_password2);
    if ($validation_result != SUCCESS_NO_ERROR) {
        return $validation_result;
    }
    // check if user password is valid
    $validation_result = validate_password($user_password);
    if ($validation_result != SUCCESS_NO_ERROR) {
        return $validation_result;
    }
    return $validation_result;
}

function check_input($details)
{
    $errors = array();
    // Check each of the things the user has input.
    // If there is a problem with any of them, set an entry in the $errors array.
    // This will then be used to (a) indicate there were errors and (b) display
    // error messages when we show the form again.
    // Check email address is valid and unique.
    if (!$details['email']) {
        $errors["email"] = "Please enter your email address";
    } elseif (!validate_email($details["email"])) {
        // validate_email() is in includes/utilities.php
        $errors["email"] = "Please enter a valid email address";
    }
    if ($details['pid'] && !ctype_digit($details['pid'])) {
        $errors['pid'] = 'Please choose a valid person';
    }
    #	if (!$details['keyword'])
    #		$errors['keyword'] = 'Please enter a search term';
    if ((get_http_var('submitted') || get_http_var('only')) && !$details['pid'] && !$details['keyword']) {
        $errors['keyword'] = 'Please choose a person and/or enter a keyword';
    }
    if (strpos($details['keyword'], '..')) {
        $errors['keyword'] = 'You probably don’t want a date range as part of your criteria, as you won’t be alerted to anything new!';
    }
    // Send the array of any errors back...
    return $errors;
}

function formCheck($params)
{
    global $_keys;
    $recaptcha_valid = FALSE;
    $errs = array();
    if (!is_null($params["recaptcha_response_field"])) {
        $resp = recaptcha_check_answer($_keys['private'], $_SERVER["REMOTE_ADDR"], $params["recaptcha_challenge_field"], $params["recaptcha_response_field"]);
        if ($resp->is_valid) {
            $recaptcha_valid = TRUE;
        } else {
            $errs['recaptcha_error'] = $resp->error;
        }
    }
    if (!$recaptcha_valid) {
        $errs['recaptcha'] = "Please complete the anti-spam test";
    }
    if (!$params['email']) {
        $errs['email'] = "Please enter the recipient's email address";
    } else {
        if (!validate_email($params['email'])) {
            $errs['email'] = "Please enter a valid email address for the recipient";
        }
    }
    if (!$params['name']) {
        $errs['name'] = "Please enter your name";
    }
    return $errs;
}

 function validation($usernew)
 {
     global $CFG;
     $usernew = (object) $usernew;
     $user = get_record('user', 'id', $usernew->id);
     $err = array();
     // validate email
     if (!validate_email($usernew->email)) {
         $err['email'] = get_string('invalidemail');
     } else {
         if ($usernew->email !== $user->email and record_exists('user', 'email', $usernew->email, 'mnethostid', $CFG->mnet_localhost_id)) {
             $err['email'] = get_string('emailexists');
         }
     }
     if ($usernew->email === $user->email and over_bounce_threshold($user)) {
         $err['email'] = get_string('toomanybounces');
     }
     /// Next the customisable profile fields
     $err += profile_validation($usernew);
     if (count($err) == 0) {
         return true;
     } else {
         return $err;
     }
 }

function check_input($details)
{
    global $ALERT, $this_page;
    $errors = array();
    // Check each of the things the user has input.
    // If there is a problem with any of them, set an entry in the $errors array.
    // This will then be used to (a) indicate there were errors and (b) display
    // error messages when we show the form again.
    // Check email address is valid and unique.
    if ($details["email"] == "") {
        $errors["email"] = "Please enter your email address";
    } elseif (!validate_email($details["email"])) {
        // validate_email() is in includes/utilities.php
        $errors["email"] = "Please enter a valid email address";
    }
    if (!ctype_digit($details['pid']) && $details['pid'] != '') {
        $errors['pid'] = 'Please choose a valid person';
    }
    #	if (!$details['keyword'])
    #		$errors['keyword'] = 'Please enter a search term';
    if ((get_http_var('submitted') || get_http_var('only')) && !$details['pid'] && !$details['keyword']) {
        $errors['keyword'] = 'Please choose a person and/or enter a keyword';
    }
    // Send the array of any errors back...
    return $errors;
}

function login($dirty_email, $dirty_password)
{
    $email = escape($dirty_email);
    $password = escape($dirty_password);
    if (!validate_email($email)) {
        echo "login-invalid-email";
        return;
    }
    if (!validate_password($password)) {
        echo "login-invalid-password";
        return;
    }
    $account_id = account_id_from_email($email);
    if ($account_id == -1) {
        echo "DEBUG: email or password invalid";
        return;
    }
    if (correct_password($account_id, $password) == false) {
        echo "DEBUG: email or password invalid";
        return;
    }
    session_regenerate_id();
    fresh_logon($account_id);
    $username = username_from_account_id($account_id);
    setcookie('LOGGED_IN', $username, time() + 3600);
    echo "login-success";
}

function wikiplugin_subscribenewsletter($data, $params)
{
    global $prefs, $user;
    $userlib = TikiLib::lib('user');
    $tikilib = TikiLib::lib('tiki');
    $smarty = TikiLib::lib('smarty');
    global $nllib;
    include_once 'lib/newsletters/nllib.php';
    extract($params, EXTR_SKIP);
    if ($prefs['feature_newsletters'] != 'y') {
        return tra('Feature disabled');
    }
    if (empty($nlId)) {
        return tra('Incorrect param');
    }
    $info = $nllib->get_newsletter($nlId);
    if (empty($info) || $info['allowUserSub'] != 'y') {
        return tra('Incorrect param');
    }
    if (!$userlib->user_has_perm_on_object($user, $nlId, 'newsletter', 'tiki_p_subscribe_newsletters')) {
        return;
    }
    if ($user) {
        $alls = $nllib->get_all_subscribers($nlId, false);
        foreach ($alls as $all) {
            if (strtolower($all['db_email']) == strtolower($user)) {
                return;
            }
        }
    }
    $wpSubscribe = '';
    $wpError = '';
    $subscribeEmail = '';
    if (isset($_REQUEST['wpSubscribe']) && $_REQUEST['wpNlId'] == $nlId) {
        if (!$user && empty($_REQUEST['wpEmail'])) {
            $wpError = tra('Invalid Email');
        } elseif (!$user && !validate_email($_REQUEST['wpEmail'], $prefs['validateEmail'])) {
            $wpError = tra('Invalid Email');
            $subscribeEmail = $_REQUEST['wpEmail'];
        } elseif ($user && $nllib->newsletter_subscribe($nlId, $user, 'y', 'n') || !$user && $nllib->newsletter_subscribe($nlId, $_REQUEST['wpEmail'], 'n', $info['validateAddr'])) {
            $wpSubscribe = 'y';
            $smarty->assign('subscribeThanks', empty($thanks) ? $data : $thanks);
        } else {
            $wpError = tra('Already subscribed');
        }
    }
    $smarty->assign_by_ref('wpSubscribe', $wpSubscribe);
    $smarty->assign_by_ref('wpError', $wpError);
    $smarty->assign('subscribeEmail', $subscribeEmail);
    $smarty->assign('subcribeMessage', empty($button) ? $data : $button);
    $smarty->assign_by_ref('subscribeInfo', $info);
    $res = $smarty->fetch('wiki-plugins/wikiplugin_subscribenewsletter.tpl');
    if (isset($params["wikisyntax"]) && $params["wikisyntax"] == 1) {
        return $res;
    } else {
        // if wikisyntax != 1 : no parsing of any wiki syntax
        return '~np~' . $res . '~/np~';
    }
}

/** Tarkasta sisaankirjautumislomake
 * @param $email string
 * @param $password string
 * @return boolean
 */
function validate($email, $password)
{
    if (validate_email($email) && validate_password($password)) {
        return true;
    } else {
        return false;
    }
}

 private function validateDetails($email, $postcode)
 {
     $valid = true;
     if (!$email || !validate_email($email)) {
         $valid = false;
     }
     if (!$postcode || !validate_postcode($postcode)) {
         $valid = false;
     }
     return $valid;
 }

function send_token()
{
    $email = validate_email(@$_POST['email']);
    if (email_overlap($email)) {
        echo "email overlap";
        die;
    }
    $mail = new PHPMailer();
    //实例化
    $mail->IsSMTP();
    // 启用SMTP
    $mail->Host = $GLOBALS['smtp_server'];
    //SMTP服务器 以163邮箱为例子
    $mail->Port = $GLOBALS['smtp_server_port'];
    //邮件发送端口
    $mail->SMTPAuth = true;
    //启用SMTP认证
    $mail->CharSet = "UTF-8";
    //字符集
    $mail->Encoding = "base64";
    //编码方式
    $mail->Username = $GLOBALS['smtp_user_mail'];
    //你的邮箱
    $mail->Password = $GLOBALS['smtp_user_pass'];
    //你的密码
    $mail->Subject = "NutLab SS Token";
    //邮件标题
    $mail->From = $GLOBALS['smtp_user_mail'];
    //发件人地址（也就是你的邮箱）
    $mail->FromName = "NutLab";
    //发件人姓名
    $address = $email;
    //收件人email
    $mail->AddAddress($address, "Dear");
    //添加收件人（地址，昵称）
    $mail->IsHTML(true);
    //支持html格式内容
    $token = generate_token();
    $mail->Body = "感谢您在我站注册了新帐号。<br/><br/>你的验证码为" . $token;
    //邮件主体内容
    if (!$mail->Send()) {
        echo "token sending fail:" . $mail->ErrorInfo;
        echo "token sending fail";
    } else {
        echo "token sending success";
    }
    $count = count($GLOBALS['DB']->query("SELECT * FROM user WHERE email=? ", array($email)));
    if ($count > 0) {
        $result = $GLOBALS['DB']->query("UPDATE user SET token=? WHERE email=?", array($token, $email));
    } else {
        $result = $GLOBALS['DB']->query("INSERT INTO user (email,pass,passwd,u,d,transfer_enable,port,enable,activated,token) VALUES (?,'','','0','0','0',?,'0','0',?)", array($email, generate_port(), $token));
    }
}

function success()
{
    global $systemArr;
    global $messageArr;
    $SystemEmailAccount = $systemArr;
    $email = $systemArr["email"];
    $error = "";
    $returnMessage = "";
    $success = true;
    $messageheading = $messageArr["messageHead"];
    $messageSubject = $messageArr["messageSubject"];
    $responseHeading = $messageArr["responseHead"];
    $responseMessage = $messageArr["responseMessage"];
    $responseSig = $messageArr["responseSig"];
    $responseSubject = $messageArr["responseSubject"];
    $responseEnd = $messageArr["responseEnd"];
    if (isset($_POST["email"])) {
        //$emailClient = mysql_real_escape_string($_POST["email"]);
        $emailClient = $_POST["email"];
        if (validate_email($emailClient)) {
            $name = $_POST["name"];
            //$emailClient = $_POST["email"];
            $title = $_POST["title"];
            $message = $_POST["message"];
            $messageContent = " <!DOCTYPE html>\n                            <html>\n                                <head>\n                                    <meta http-equiv='Content-Type' content='text/html; charset=UTF-8'>\n                                </head>\n                                <body style='font-family: calibri, sans-serif; font-size: 16px;'>\n        \n                                    <h1 style='padding: 10px; background-color: #1f1f1f; color: #ffffff; font-size: 28px;'>Hi there! You've received {$messageheading} from your website :)</h1>\n        \n                                    <table style='border-spacing: 0px; border: 1px solid #ccc; border-bottom: none;'>\n                                        <tr>\n                                            <td width='20%' style='padding: 5px; border-bottom: 1px solid #ccc; border-right: 1px solid #ccc;'>Enquirer's Name</td>\n                                            <td width='80%' style='padding: 5px; border-bottom: 1px solid #ccc;'>{$name}</td>\n                                        </tr>\n                                        <tr>\n                                            <td style='padding: 5px; border-bottom: 1px solid #ccc; border-right: 1px solid #ccc;'>Enquirer's Email Address</td>\n                                            <td style='padding: 5px; border-bottom: 1px solid #ccc;'>{$emailClient}</td>\n                                        </tr>\n                                        <tr>\n                                            <td style='padding: 5px; border-bottom: 1px solid #ccc; border-right: 1px solid #ccc;'>Message Title</td>\n                                            <td style='padding: 5px; border-bottom: 1px solid #ccc;'>{$title}</td>\n                                        </tr>\n                                        <tr>\n                                            <td style='padding: 5px; border-bottom: 1px solid #ccc; border-right: 1px solid #ccc;'>Enquirer's Message</td>\n                                            <td style='padding: 5px; border-bottom: 1px solid #ccc;'>{$message}</td>\n                                        </tr>\n                                    </table>\n        \n                                    <h2 style='padding: 10px; background-color: #1f1f1f; color: #ffffff; font-size: 28px;'>Enjoy your day!</h2>\n        \n                                    <p style='padding: 10px; background-color: #eee; color: #777; font-size: 12px;'>Brought to you by <b>Epicdev</b><sup>tm</sup>. Please do not hesitate to contact us for any general or support related queries at [email protected]</p>\n        \n                                </body>\n                            </html> ";
            //////////////////////////////////// HTML CODE FOR CLIENT ENQUIRY EMAIL ////////////////////////////////////
            $status = sendMail(array($email), $SystemEmailAccount, $messageSubject, $messageContent, null);
            if ($status["status"] == true) {
                $returnMessage = "Message Sent";
                $messageRespond = " <!DOCTYPE html>\n                        <html>\n                            <head>\n                                <meta http-equiv='Content-Type' content='text/html; charset=UTF-8'>\n                            </head>\n                            <body style='font-family: calibri, sans-serif; font-size: 16px;'>\n        \n                                <h1 style='padding: 10px; background-color: #00CB16; color: #ffffff; font-size: 28px;'>{$responseHeading}</h1>\n        \n                                <table style='border-spacing: 0px; border: 1px solid #ccc; border-bottom: none;'>\n                                    <tr>\n                                        <td width='100%' style='padding: 5px; border-bottom: 1px solid #ccc;'>{$responseMessage}</td>\n                                    </tr>\n                                </table>\n        \n                                <p style='padding: 10px 0 0 0; color: #00CB16; font-size: 24px; font-weight: bold; margin: 0'>{$responseEnd}</p>\n                                <p style='padding: 0; color: #00CB16; font-size: 18px; margin: 0 0 10px 0'>{$responseSig}</p>\n        \n                                <p style='padding: 10px; background-color: #eee; color: #777; font-size: 11px;'>Brought to you by <b>Epicdev</b><sup>tm</sup> - www.epicdev.co.za. Please do not hesitate to contact us for any general or support related queries at [email protected]</p>\n        \n                            </body>\n                        </html> ";
                //////////////////////////////////// HTML CODE FOR CLIENT RESPONSE EMAIL ////////////////////////////////////
                if (validate_email($emailClient)) {
                    $status2 = sendMail(array($emailClient), $SystemEmailAccount, $responseSubject, $messageRespond, null);
                    if ($status2["status"] != true) {
                    }
                }
            } else {
                $returnMessage = "Failed to send message";
                $success = false;
            }
        } else {
            $returnMessage = "Invalid Email Address";
            $success = false;
        }
    }
    header('Content-type: application/json');
    if ($success == true) {
        $success = 1;
    } else {
        $success = 0;
    }
    echo "{\"status\":" . $success . ", \"message\":\"" . $returnMessage . "\"}";
}

 /**
  * Creates necessary fields in the messaging config form.
  * @param object $mform preferences form class
  */
 function config_form($preferences)
 {
     global $USER, $OUTPUT;
     $inputattributes = array('size' => '30', 'name' => 'email_email', 'value' => $preferences->email_email);
     $string = get_string('email', 'message_email') . ': ' . html_writer::empty_tag('input', $inputattributes);
     if (empty($preferences->email_email) && !empty($preferences->userdefaultemail)) {
         $string .= ' (' . get_string('default') . ': ' . s($preferences->userdefaultemail) . ')';
     }
     if (!empty($preferences->email_email) && !validate_email($preferences->email_email)) {
         $string .= $OUTPUT->container(get_string('invalidemail'), 'error');
     }
     return $string;
 }

function account_register_new($unix_name, $realname, $password1, $password2, $email, $language, $timezone, $mail_site, $mail_va, $language_id, $timezone)
{
    global $feedback;
    if (db_numrows(db_query("SELECT user_id FROM users WHERE user_name LIKE '{$unix_name}'")) > 0) {
        $feedback .= "That username already exists.";
        return false;
    }
    // Check that username is not identical with an existing unix groupname (groups) helix 22.06.2001
    if (db_numrows(db_query("SELECT unix_group_name FROM groups WHERE unix_group_name LIKE '{$unix_name}'")) > 0) {
        $feedback .= "That username is identical with the unixname of an existing group.";
        return false;
    }
    // End of change helix 22.06.2001
    if (!$unix_name) {
        $feedback .= "You must supply a username.";
        return false;
    }
    if (!$password1) {
        $feedback .= "You must supply a password.";
        return false;
    }
    if ($password1 != $password2) {
        $feedback .= "Passwords do not match.";
        return false;
    }
    if (!account_pwvalid($password1)) {
        $feedback .= ' Password must be at least 6 characters. ';
        return false;
    }
    if (!account_namevalid($unix_name)) {
        $feedback .= ' Invalid Unix Name ';
        return false;
    }
    if (!validate_email($email)) {
        $feedback .= ' Invalid Email Address ';
        return false;
    }
    // if we got this far, it must be good
    $confirm_hash = substr(md5($session_hash . $HTTP_POST_VARS['form_pw'] . time()), 0, 16);
    $result = db_query("INSERT INTO users (user_name,user_pw,unix_pw,realname,email,add_date," . "status,confirm_hash,mail_siteupdates,mail_va,language,timezone) " . "VALUES ('{$unix_name}'," . "'" . md5($password1) . "'," . "'" . account_genunixpw($password1) . "'," . "'" . "{$realname}'," . "'{$email}'," . "'" . time() . "'," . "'P'," . "'{$confirm_hash}'," . "'" . ($mail_site ? "1" : "0") . "'," . "'" . ($mail_va ? "1" : "0") . "'," . "'{$language_id}'," . "'{$timezone}')");
    $user_id = db_insertid($result, 'users', 'user_id');
    if (!$result || !$user_id) {
        $feedback .= ' Insert Failed ' . db_error();
        return false;
    } else {
        // send mail
        $message = "Thank you for registering on the " . $GLOBALS['sys_default_name'] . " web site. In order\n" . "to complete your registration, visit the following url: \n\n" . "https://" . $GLOBALS['HTTP_HOST'] . "/account/verify.php?confirm_hash={$confirm_hash}\n\n" . "Enjoy the site.\n\n" . " -- the " . $GLOBALS['sys_default_name'] . " staff\n";
        mail($email, $GLOBALS['sys_default_name'] . " Account Registration", $message, "From: noreply@" . $GLOBALS['sys_default_domain']);
        return $user_id;
    }
}

function validate_input()
{
    global $errors;
    $email = stripslashes(trim($_POST['email']));
    // Did the user enter anything?
    if ($email == '') {
        $errors['email'] = '<b><font color="red">***Email' . ' address?***</font><b>';
    } else {
        $ok = validate_email($email);
        if (!$ok) {
            $errors['email'] = '<b><font color="red">***Invalid' . ' email address***</font></b>';
        }
    }
}

function validate_reset_password_form()
{
    $errors = array();
    // Validate email field
    if ($_POST['email']) {
        if (validate_email(format_trim($_POST['email']))) {
            //Do Nothing
        } else {
            $errors[] = "Email is not valid.";
        }
    } else {
        $errors[] = "Must provide a valid email address.";
    }
    return $errors;
}

 function validation($data)
 {
     global $CFG;
     $errors = array();
     $authplugin = get_auth_plugin($CFG->registerauth);
     if (record_exists('user', 'username', $data['username'], 'mnethostid', $CFG->mnet_localhost_id)) {
         $errors['username'] = get_string('usernameexists');
     } else {
         if (empty($CFG->extendedusernamechars)) {
             $string = eregi_replace("[^(-\\.[:alnum:])]", '', $data['username']);
             if (strcmp($data['username'], $string)) {
                 $errors['username'] = get_string('alphanumerical');
             }
         }
     }
     //check if user exists in external db
     //TODO: maybe we should check all enabled plugins instead
     if ($authplugin->user_exists($data['username'])) {
         $errors['username'] = get_string('usernameexists');
     }
     if (!validate_email($data['email'])) {
         $errors['email'] = get_string('invalidemail');
     } else {
         if (record_exists('user', 'email', $data['email'])) {
             $errors['email'] = get_string('emailexists') . ' <a href="forgot_password.php">' . get_string('newpassword') . '?</a>';
         }
     }
     if (empty($data['email2'])) {
         $errors['email2'] = get_string('missingemail');
     } else {
         if ($data['email2'] != $data['email']) {
             $errors['email2'] = get_string('invalidemail');
         }
     }
     if (!isset($errors['email'])) {
         if ($err = email_is_not_allowed($data['email'])) {
             $errors['email'] = $err;
         }
     }
     if (!check_password_policy($data['password'], $errmsg)) {
         $errors['password'] = $errmsg;
     }
     if (0 == count($errors)) {
         return true;
     } else {
         return $errors;
     }
 }

function validate_form(&$user)
{
    $json_send = array();
    foreach ($user as $k => $v) {
        //            if ( $data['fields'][$k][2] == true ) {
        if ($k == 'email') {
            if ($v == '' || !validate_email($v)) {
                $user['__error'][$k] = true;
            }
        } else {
            if ($v == '') {
                $user['__error'][$k] = true;
            }
        }
        //              }
    }
    return $user['__error'] ? false : true;
}

 function validation($data, $files)
 {
     $errors = parent::validation($data, $files);
     if (isset($data['email'])) {
         $emails = preg_split('~[; ]+~', $data['email']);
         if (count($emails) < 1) {
             $errors['email'] = get_string('invalidemails', 'forumng');
         } else {
             foreach ($emails as $email) {
                 if (!validate_email($email)) {
                     $errors['email'] = get_string('invalidemails', 'forumng');
                     break;
                 }
             }
         }
     }
     return $errors;
 }

 /**
  * Validates form data
  */
 public function validation($data, $files)
 {
     global $DB;
     $errors = parent::validation($data, $files);
     if (!validate_email($data['email'])) {
         $errors['email'] = get_string('invalidemail');
     } else {
         $check = new stdClass();
         $check->backpackurl = $data['backpackurl'];
         $check->email = $data['email'];
         $bp = new OpenBadgesBackpackHandler($check);
         $request = $bp->curl_request('user');
         if (isset($request->status) && $request->status == 'missing') {
             $errors['email'] = get_string('error:nosuchuser', 'badges');
         }
     }
     return $errors;
 }