C:/xampp/htdocs/moodle/auth/email/auth.php

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<?php

if (!defined('MOODLE_INTERNAL')) {
    die('Direct access to this script is forbidden.');    
}

require_once($CFG->libdir.'/authlib.php');

class auth_plugin_email extends auth_plugin_base {

    function auth_plugin_email() {
        $this->authtype = 'email';
        $this->config = get_config('auth/email');
    }

    function user_login ($username, $password) {
        global $CFG, $DB;
        if ($user = $DB->get_record('user', array('username'=>$username, 'mnethostid'=>$CFG->mnet_localhost_id))) {
            return validate_internal_user_password($user, $password);
        }
        return false;
    }

    function user_update_password($user, $newpassword) {
        $user = get_complete_user_data('id', $user->id);
        return update_internal_user_password($user, $newpassword);
    }

    function can_signup() {
        return true;
    }

    function user_signup($user, $notify=true) {
        global $CFG, $DB;
        require_once($CFG->dirroot.'/user/profile/lib.php');

        $user->password = hash_internal_user_password($user->password);

        $user->id = $DB->insert_record('user', $user);

        profile_save_data($user);

        $user = $DB->get_record('user', array('id'=>$user->id));
        events_trigger('user_created', $user);

        if (! send_confirmation_email($user)) {
            print_error('auth_emailnoemail','auth_email');
        }

        if ($notify) {
            global $CFG, $PAGE, $OUTPUT;
            $emailconfirm = get_string('emailconfirm');
            $PAGE->navbar->add($emailconfirm);
            $PAGE->set_title($emailconfirm);
            $PAGE->set_heading($PAGE->course->fullname);
            echo $OUTPUT->header();
            notice(get_string('emailconfirmsent', '', $user->email), "$CFG->wwwroot/index.php");
        } else {
            return true;
        }
    }

    function can_confirm() {
        return true;
    }

    function user_confirm($username, $confirmsecret) {
        global $DB;
        $user = get_complete_user_data('username', $username);

        if (!empty($user)) {
            if ($user->confirmed) {
                return AUTH_CONFIRM_ALREADY;

            } else if ($user->auth != 'email') {
                return AUTH_CONFIRM_ERROR;

            } else if ($user->secret == $confirmsecret) {   // They have provided the secret key to get in
                $DB->set_field("user", "confirmed", 1, array("id"=>$user->id));
                $DB->set_field("user", "firstaccess", time(), array("id"=>$user->id));
                return AUTH_CONFIRM_OK;
            }
        } else {
            return AUTH_CONFIRM_ERROR;
        }
    }

    function prevent_local_passwords() {
        return false;
    }

    function is_internal() {
        return true;
    }

    function can_change_password() {
        return true;
    }

    function change_password_url() {
        return null; // use default internal method
    }

    function can_reset_password() {
        return true;
    }

    function config_form($config, $err, $user_fields) {
        include "config.html";
    }

    function process_config($config) {
        // set to defaults if undefined
        if (!isset($config->recaptcha)) {
            $config->recaptcha = false;
        }

        // save settings
        set_config('recaptcha', $config->recaptcha, 'auth/email');
        return true;
    }

    function is_captcha_enabled() {
        global $CFG;
        return isset($CFG->recaptchapublickey) && isset($CFG->recaptchaprivatekey) && get_config("auth/{$this->authtype}", 'recaptcha');
    }

}