block_openid.php

<?php

/**
 * OpenID block
 *
 * This block provides a simple login form for your site's side bars.  It
 * displays content appropriate for the user's state so, for example, it will
 * direct the user the the actions.php script if they are logged in and allowed
 * to amend their account or the login form if they aren't logged in.
 *
 * @author Brent Boghosian <brent.boghosian@remote-learner.net>
 * @copyright Copyright (c) 2011 Remote-Learner
 * @author Stuart Metcalfe <info@pdl.uk.com>
 * @copyright Copyright (c) 2007 Canonical
 * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
 * @package openid
 **/

require_once("{$CFG->dirroot}/auth/openid/locallib.php");

class block_openid extends block_base {
    function init() {
        $this->title = get_string('pluginname','block_openid');
        $this->version = 2013022014;
    }

    function applicable_formats() {
        return array('site' => true);
    }

    function get_content() {
        global $USER, $CFG, $DB, $OUTPUT;

        // We don't want to show this block if OpenID auth isn't enabled
        if (!is_enabled_auth('openid')) {
            return '';
        }

        $config = get_config('auth/openid');
        $user_is_openid = isset($USER->auth) && ($USER->auth == 'openid');
        $user_loggedin = !user_not_loggedin();

        // Check to see if the box should be displayed to a logged in user
        if ($user_loggedin) {
            // We don't want to allow admin users to be changed
            if (is_siteadmin($USER->id)) {
                return '';
            }

            if (!isset($config->auth_openid_allow_account_change)) {
                $config->auth_openid_allow_account_change='true';
            }

            if (!isset($config->auth_openid_allow_multiple)) {
                $config->auth_openid_allow_multiple='true';
            }

            $allow_change = ($config->auth_openid_allow_account_change == 'true');
            $allow_append = ($config->auth_openid_allow_multiple == 'true');

            if (($user_is_openid && !$allow_append) || (!$user_is_openid && !$allow_change)) {
                return '';
            }
        }

        if ($this->content !== NULL) {
            return $this->content;
        }

        $this->content = new stdClass;
        $this->content->footer = ''; // too much space using this for change pwd
        $this->content->text = '';
        $username = (get_moodle_cookie() === 'nobody') 
                    ? '' : get_moodle_cookie();

        $user = get_complete_user_data('username', $username);
        if (empty($user) || $user->auth != 'openid' || $user_loggedin) {
            $username='';
        }

        if ($user_loggedin) {
            $endpoint = $CFG->wwwroot.'/auth/openid/actions.php';
        } else {
            $endpoint = $CFG->wwwroot.'/login/index.php';
        }

        $this->content->text .= '
            <style type="text/css">
            input.openid_login {
                background: url('.$CFG->wwwroot.'/auth/openid/icon.gif) no-repeat;
                background-color: #fff;
                background-position: 0 50%;
                color: #000;
                padding-left: 18px;
            }
            </style>
            <form class="loginform" name="login" method="post" action="'.$endpoint.'" onsubmit="if (document.login.openid_url.value == \'\') return false;" >
                <table align="center" cellpadding="2" cellspacing="0" class="logintable">
        ';

        if ($user_loggedin) {
            $this->content->text .= '<tr><td class="c0 r0" colspan="2"><small>';

            if ($user_is_openid) {
                $this->content->text .= '<input type="hidden" name="openid_action" value="append" />';
                $this->content->text .= get_string('append_text',
                                                   'block_openid');
            } else {
                $this->content->text .= '<input type="hidden" name="openid_action" value="change" />';
                $this->content->text .= get_string('change_text',
                                                   'block_openid');
            }

            $this->content->text .= ':</small></td></tr>';
        }

        $this->content->text .= '
                <tr>
                    <td class="c0 r1" colspan="2">
                        <input class="openid_login" type="text" name="openid_url" size="15" value="" />
                    </td>
                </tr>
               ';

        $this->content->text .=
               '<tr>
                    <td class="c0 r2" align="left">
                        <a href="http://openid.net/" target="newWindow"><small>'.get_string('whats_this', 'auth_openid').'</small></a>
                    </td>
                    <td class="c1 r2" align="center">
                        <input type="submit" value="'.get_string('login').'" />
                    </td>
                </tr>
               ';

        $authplugin = get_auth_plugin('openid');
        if (!$user_loggedin || $authplugin->can_change_password()) {
            $this->content->text .=
               '<tr>
                    <td colspan="2" class="c1 r3" align="center">';
            if (!$user_loggedin) {
                $this->content->text .=
                       '<a href="'.$CFG->wwwroot.'/auth/openid/fallback.php"><small>'.get_string('provider_offline', 'auth_openid')."</small></a>\n";
            }
            if ($authplugin->can_change_password()) {
                $this->content->text .=
                       '<a href="'.$authplugin->change_password_url().'"><small>'. get_string('openid_manage', 'auth_openid') ."</small></a>\n";
            }
            $this->content->text .=
                   '</td>
                </tr>
               ';
        }
        $this->content->text .=
           '</table>
        </form>
        ';
        return $this->content;
    }
}