Move OpenID-related files to OpenID plugin directory

As a first step to pluginizing our OpenID support, I've moved the
important OpenID-related files to a dedicated plugin directory. Many
of these classes are still referred to by libraries that are still in
core.

8 files changed, 1645 insertions, 0 deletions

diff --git a/plugins/OpenID/User_openid.php b/plugins/OpenID/User_openid.php
new file mode 100644
index 000000000..f4fda1c72
--- /dev/null
+++ b/plugins/OpenID/User_openid.php
@@ -0,0 +1,25 @@
+<?php
+/**
+ * Table Definition for user_openid
+ */
+require_once INSTALLDIR.'/classes/Memcached_DataObject.php';
+
+class User_openid extends Memcached_DataObject 
+{
+    ###START_AUTOCODE
+    /* the code below is auto generated do not remove the above tag */
+
+    public $__table = 'user_openid';                     // table name
+    public $canonical;                       // varchar(255)  primary_key not_null
+    public $display;                         // varchar(255)  unique_key not_null
+    public $user_id;                         // int(4)   not_null
+    public $created;                         // datetime()   not_null
+    public $modified;                        // timestamp()   not_null default_CURRENT_TIMESTAMP
+
+    /* Static get */
+    function staticGet($k,$v=null)
+    { return Memcached_DataObject::staticGet('User_openid',$k,$v); }
+
+    /* the code above is auto generated do not remove the tag below */
+    ###END_AUTOCODE
+}
diff --git a/plugins/OpenID/finishaddopenid.php b/plugins/OpenID/finishaddopenid.php
new file mode 100644
index 000000000..32bceecfd
--- /dev/null
+++ b/plugins/OpenID/finishaddopenid.php
@@ -0,0 +1,185 @@
+<?php
+/**
+ * Laconica, the distributed open-source microblogging tool
+ *
+ * Complete adding an OpenID
+ *
+ * PHP version 5
+ *
+ * LICENCE: This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @category  Settings
+ * @package   Laconica
+ * @author    Evan Prodromou <evan@controlyourself.ca>
+ * @copyright 2008-2009 Control Yourself, Inc.
+ * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link      http://laconi.ca/
+ */
+
+if (!defined('LACONICA')) {
+    exit(1);
+}
+
+require_once INSTALLDIR.'/lib/openid.php';
+
+/**
+ * Complete adding an OpenID
+ *
+ * Handle the return from an OpenID verification
+ *
+ * @category Settings
+ * @package  Laconica
+ * @author   Evan Prodromou <evan@controlyourself.ca>
+ * @license  http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link     http://laconi.ca/
+ */
+
+class FinishaddopenidAction extends Action
+{
+    var $msg = null;
+
+    /**
+     * Handle the redirect back from OpenID confirmation
+     *
+     * Check to see if the user's logged in, and then try
+     * to use the OpenID login system.
+     *
+     * @param array $args $_REQUEST arguments
+     *
+     * @return void
+     */
+
+    function handle($args)
+    {
+        parent::handle($args);
+        if (!common_logged_in()) {
+            $this->clientError(_('Not logged in.'));
+        } else {
+            $this->tryLogin();
+        }
+    }
+
+    /**
+     * Try to log in using OpenID
+     *
+     * Check the OpenID for validity; potentially store it.
+     *
+     * @return void
+     */
+
+    function tryLogin()
+    {
+        $consumer =& oid_consumer();
+
+        $response = $consumer->complete(common_local_url('finishaddopenid'));
+
+        if ($response->status == Auth_OpenID_CANCEL) {
+            $this->message(_('OpenID authentication cancelled.'));
+            return;
+        } else if ($response->status == Auth_OpenID_FAILURE) {
+            // Authentication failed; display the error message.
+            $this->message(sprintf(_('OpenID authentication failed: %s'),
+                                   $response->message));
+        } else if ($response->status == Auth_OpenID_SUCCESS) {
+
+            $display   = $response->getDisplayIdentifier();
+            $canonical = ($response->endpoint && $response->endpoint->canonicalID) ?
+              $response->endpoint->canonicalID : $display;
+
+            $sreg_resp = Auth_OpenID_SRegResponse::fromSuccessResponse($response);
+
+            if ($sreg_resp) {
+                $sreg = $sreg_resp->contents();
+            }
+
+            $cur =& common_current_user();
+
+            $other = oid_get_user($canonical);
+
+            if ($other) {
+                if ($other->id == $cur->id) {
+                    $this->message(_('You already have this OpenID!'));
+                } else {
+                    $this->message(_('Someone else already has this OpenID.'));
+                }
+                return;
+            }
+
+            // start a transaction
+
+            $cur->query('BEGIN');
+
+            $result = oid_link_user($cur->id, $canonical, $display);
+
+            if (!$result) {
+                $this->message(_('Error connecting user.'));
+                return;
+            }
+            if ($sreg) {
+                if (!oid_update_user($cur, $sreg)) {
+                    $this->message(_('Error updating profile'));
+                    return;
+                }
+            }
+
+            // success!
+
+            $cur->query('COMMIT');
+
+            oid_set_last($display);
+
+            common_redirect(common_local_url('openidsettings'), 303);
+        }
+    }
+
+    /**
+     * Show a failure message
+     *
+     * Something went wrong. Save the message, and show the page.
+     *
+     * @param string $msg Error message to show
+     *
+     * @return void
+     */
+
+    function message($msg)
+    {
+        $this->message = $msg;
+        $this->showPage();
+    }
+
+    /**
+     * Title of the page
+     *
+     * @return string title
+     */
+
+    function title()
+    {
+        return _('OpenID Login');
+    }
+
+    /**
+     * Show error message
+     *
+     * @return void
+     */
+
+    function showPageNotice()
+    {
+        if ($this->message) {
+            $this->element('p', 'error', $this->message);
+        }
+    }
+}
diff --git a/plugins/OpenID/finishopenidlogin.php b/plugins/OpenID/finishopenidlogin.php
new file mode 100644
index 000000000..ff0b35218
--- /dev/null
+++ b/plugins/OpenID/finishopenidlogin.php
@@ -0,0 +1,495 @@
+<?php
+/*
+ * Laconica - a distributed open-source microblogging tool
+ * Copyright (C) 2008, 2009, Control Yourself, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+if (!defined('LACONICA')) { exit(1); }
+
+require_once(INSTALLDIR.'/lib/openid.php');
+
+class FinishopenidloginAction extends Action
+{
+    var $error = null;
+    var $username = null;
+    var $message = null;
+
+    function handle($args)
+    {
+        parent::handle($args);
+        if (common_is_real_login()) {
+            $this->clientError(_('Already logged in.'));
+        } else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
+            $token = $this->trimmed('token');
+            if (!$token || $token != common_session_token()) {
+                $this->showForm(_('There was a problem with your session token. Try again, please.'));
+                return;
+            }
+            if ($this->arg('create')) {
+                if (!$this->boolean('license')) {
+                    $this->showForm(_('You can\'t register if you don\'t agree to the license.'),
+                                    $this->trimmed('newname'));
+                    return;
+                }
+                $this->createNewUser();
+            } else if ($this->arg('connect')) {
+                $this->connectUser();
+            } else {
+                common_debug(print_r($this->args, true), __FILE__);
+                $this->showForm(_('Something weird happened.'),
+                                $this->trimmed('newname'));
+            }
+        } else {
+            $this->tryLogin();
+        }
+    }
+
+    function showPageNotice()
+    {
+        if ($this->error) {
+            $this->element('div', array('class' => 'error'), $this->error);
+        } else {
+            $this->element('div', 'instructions',
+                           sprintf(_('This is the first time you\'ve logged into %s so we must connect your OpenID to a local account. You can either create a new account, or connect with your existing account, if you have one.'), common_config('site', 'name')));
+        }
+    }
+
+    function title()
+    {
+        return _('OpenID Account Setup');
+    }
+
+    function showForm($error=null, $username=null)
+    {
+        $this->error = $error;
+        $this->username = $username;
+
+        $this->showPage();
+    }
+
+    function showContent()
+    {
+        if (!empty($this->message_text)) {
+            $this->element('div', array('class' => 'error'), $this->message_text);
+            return;
+        }
+
+        $this->elementStart('form', array('method' => 'post',
+                                          'id' => 'account_connect',
+                                          'action' => common_local_url('finishopenidlogin')));
+        $this->hidden('token', common_session_token());
+        $this->element('h2', null,
+                       _('Create new account'));
+        $this->element('p', null,
+                       _('Create a new user with this nickname.'));
+        $this->input('newname', _('New nickname'),
+                     ($this->username) ? $this->username : '',
+                     _('1-64 lowercase letters or numbers, no punctuation or spaces'));
+        $this->elementStart('p');
+        $this->element('input', array('type' => 'checkbox',
+                                      'id' => 'license',
+                                      'name' => 'license',
+                                      'value' => 'true'));
+        $this->text(_('My text and files are available under '));
+        $this->element('a', array('href' => common_config('license', 'url')),
+                       common_config('license', 'title'));
+        $this->text(_(' except this private data: password, email address, IM address, phone number.'));
+        $this->elementEnd('p');
+        $this->submit('create', _('Create'));
+        $this->element('h2', null,
+                       _('Connect existing account'));
+        $this->element('p', null,
+                       _('If you already have an account, login with your username and password to connect it to your OpenID.'));
+        $this->input('nickname', _('Existing nickname'));
+        $this->password('password', _('Password'));
+        $this->submit('connect', _('Connect'));
+        $this->elementEnd('form');
+    }
+
+    function tryLogin()
+    {
+        $consumer = oid_consumer();
+
+        $response = $consumer->complete(common_local_url('finishopenidlogin'));
+
+        if ($response->status == Auth_OpenID_CANCEL) {
+            $this->message(_('OpenID authentication cancelled.'));
+            return;
+        } else if ($response->status == Auth_OpenID_FAILURE) {
+            // Authentication failed; display the error message.
+            $this->message(sprintf(_('OpenID authentication failed: %s'), $response->message));
+        } else if ($response->status == Auth_OpenID_SUCCESS) {
+            // This means the authentication succeeded; extract the
+            // identity URL and Simple Registration data (if it was
+            // returned).
+            $display = $response->getDisplayIdentifier();
+            $canonical = ($response->endpoint->canonicalID) ?
+              $response->endpoint->canonicalID : $response->getDisplayIdentifier();
+
+            $sreg_resp = Auth_OpenID_SRegResponse::fromSuccessResponse($response);
+
+            if ($sreg_resp) {
+                $sreg = $sreg_resp->contents();
+            }
+
+            $user = oid_get_user($canonical);
+
+            if ($user) {
+                oid_set_last($display);
+                # XXX: commented out at @edd's request until better
+                # control over how data flows from OpenID provider.
+                # oid_update_user($user, $sreg);
+                common_set_user($user);
+                common_real_login(true);
+                if (isset($_SESSION['openid_rememberme']) && $_SESSION['openid_rememberme']) {
+                    common_rememberme($user);
+                }
+                unset($_SESSION['openid_rememberme']);
+                $this->goHome($user->nickname);
+            } else {
+                $this->saveValues($display, $canonical, $sreg);
+                $this->showForm(null, $this->bestNewNickname($display, $sreg));
+            }
+        }
+    }
+
+    function message($msg)
+    {
+        $this->message_text = $msg;
+        $this->showPage();
+    }
+
+    function saveValues($display, $canonical, $sreg)
+    {
+        common_ensure_session();
+        $_SESSION['openid_display'] = $display;
+        $_SESSION['openid_canonical'] = $canonical;
+        $_SESSION['openid_sreg'] = $sreg;
+    }
+
+    function getSavedValues()
+    {
+        return array($_SESSION['openid_display'],
+                     $_SESSION['openid_canonical'],
+                     $_SESSION['openid_sreg']);
+    }
+
+    function createNewUser()
+    {
+        # FIXME: save invite code before redirect, and check here
+
+        if (common_config('site', 'closed')) {
+            $this->clientError(_('Registration not allowed.'));
+            return;
+        }
+
+        $invite = null;
+
+        if (common_config('site', 'inviteonly')) {
+            $code = $_SESSION['invitecode'];
+            if (empty($code)) {
+                $this->clientError(_('Registration not allowed.'));
+                return;
+            }
+
+            $invite = Invitation::staticGet($code);
+
+            if (empty($invite)) {
+                $this->clientError(_('Not a valid invitation code.'));
+                return;
+            }
+        }
+
+        $nickname = $this->trimmed('newname');
+
+        if (!Validate::string($nickname, array('min_length' => 1,
+                                               'max_length' => 64,
+                                               'format' => VALIDATE_NUM . VALIDATE_ALPHA_LOWER))) {
+            $this->showForm(_('Nickname must have only lowercase letters and numbers and no spaces.'));
+            return;
+        }
+
+        if (!User::allowed_nickname($nickname)) {
+            $this->showForm(_('Nickname not allowed.'));
+            return;
+        }
+
+        if (User::staticGet('nickname', $nickname)) {
+            $this->showForm(_('Nickname already in use. Try another one.'));
+            return;
+        }
+
+        list($display, $canonical, $sreg) = $this->getSavedValues();
+
+        if (!$display || !$canonical) {
+            $this->serverError(_('Stored OpenID not found.'));
+            return;
+        }
+
+        # Possible race condition... let's be paranoid
+
+        $other = oid_get_user($canonical);
+
+        if ($other) {
+            $this->serverError(_('Creating new account for OpenID that already has a user.'));
+            return;
+        }
+
+        $location = '';
+        if (!empty($sreg['country'])) {
+            if ($sreg['postcode']) {
+                # XXX: use postcode to get city and region
+                # XXX: also, store postcode somewhere -- it's valuable!
+                $location = $sreg['postcode'] . ', ' . $sreg['country'];
+            } else {
+                $location = $sreg['country'];
+            }
+        }
+
+        if (!empty($sreg['fullname']) && mb_strlen($sreg['fullname']) <= 255) {
+            $fullname = $sreg['fullname'];
+        } else {
+            $fullname = '';
+        }
+
+        if (!empty($sreg['email']) && Validate::email($sreg['email'], true)) {
+            $email = $sreg['email'];
+        } else {
+            $email = '';
+        }
+
+        # XXX: add language
+        # XXX: add timezone
+
+        $args = array('nickname' => $nickname,
+                      'email' => $email,
+                      'fullname' => $fullname,
+                      'location' => $location);
+
+        if (!empty($invite)) {
+            $args['code'] = $invite->code;
+        }
+
+        $user = User::register($args);
+
+        $result = oid_link_user($user->id, $canonical, $display);
+
+        oid_set_last($display);
+        common_set_user($user);
+        common_real_login(true);
+        if (isset($_SESSION['openid_rememberme']) && $_SESSION['openid_rememberme']) {
+            common_rememberme($user);
+        }
+        unset($_SESSION['openid_rememberme']);
+        common_redirect(common_local_url('showstream', array('nickname' => $user->nickname)),
+                        303);
+    }
+
+    function connectUser()
+    {
+        $nickname = $this->trimmed('nickname');
+        $password = $this->trimmed('password');
+
+        if (!common_check_user($nickname, $password)) {
+            $this->showForm(_('Invalid username or password.'));
+            return;
+        }
+
+        # They're legit!
+
+        $user = User::staticGet('nickname', $nickname);
+
+        list($display, $canonical, $sreg) = $this->getSavedValues();
+
+        if (!$display || !$canonical) {
+            $this->serverError(_('Stored OpenID not found.'));
+            return;
+        }
+
+        $result = oid_link_user($user->id, $canonical, $display);
+
+        if (!$result) {
+            $this->serverError(_('Error connecting user to OpenID.'));
+            return;
+        }
+
+        oid_update_user($user, $sreg);
+        oid_set_last($display);
+        common_set_user($user);
+        common_real_login(true);
+        if (isset($_SESSION['openid_rememberme']) && $_SESSION['openid_rememberme']) {
+            common_rememberme($user);
+        }
+        unset($_SESSION['openid_rememberme']);
+        $this->goHome($user->nickname);
+    }
+
+    function goHome($nickname)
+    {
+        $url = common_get_returnto();
+        if ($url) {
+            # We don't have to return to it again
+            common_set_returnto(null);
+        } else {
+            $url = common_local_url('all',
+                                    array('nickname' =>
+                                          $nickname));
+        }
+        common_redirect($url, 303);
+    }
+
+    function bestNewNickname($display, $sreg)
+    {
+
+        # Try the passed-in nickname
+
+        if (!empty($sreg['nickname'])) {
+            $nickname = $this->nicknamize($sreg['nickname']);
+            if ($this->isNewNickname($nickname)) {
+                return $nickname;
+            }
+        }
+
+        # Try the full name
+
+        if (!empty($sreg['fullname'])) {
+            $fullname = $this->nicknamize($sreg['fullname']);
+            if ($this->isNewNickname($fullname)) {
+                return $fullname;
+            }
+        }
+
+        # Try the URL
+
+        $from_url = $this->openidToNickname($display);
+
+        if ($from_url && $this->isNewNickname($from_url)) {
+            return $from_url;
+        }
+
+        # XXX: others?
+
+        return null;
+    }
+
+    function isNewNickname($str)
+    {
+        if (!Validate::string($str, array('min_length' => 1,
+                                          'max_length' => 64,
+                                          'format' => VALIDATE_NUM . VALIDATE_ALPHA_LOWER))) {
+            return false;
+        }
+        if (!User::allowed_nickname($str)) {
+            return false;
+        }
+        if (User::staticGet('nickname', $str)) {
+            return false;
+        }
+        return true;
+    }
+
+    function openidToNickname($openid)
+    {
+        if (Auth_Yadis_identifierScheme($openid) == 'XRI') {
+            return $this->xriToNickname($openid);
+        } else {
+            return $this->urlToNickname($openid);
+        }
+    }
+
+    # We try to use an OpenID URL as a legal Laconica user name in this order
+    # 1. Plain hostname, like http://evanp.myopenid.com/
+    # 2. One element in path, like http://profile.typekey.com/EvanProdromou/
+    #    or http://getopenid.com/evanprodromou
+
+    function urlToNickname($openid)
+    {
+        static $bad = array('query', 'user', 'password', 'port', 'fragment');
+
+        $parts = parse_url($openid);
+
+        # If any of these parts exist, this won't work
+
+        foreach ($bad as $badpart) {
+            if (array_key_exists($badpart, $parts)) {
+                return null;
+            }
+        }
+
+        # We just have host and/or path
+
+        # If it's just a host...
+        if (array_key_exists('host', $parts) &&
+            (!array_key_exists('path', $parts) || strcmp($parts['path'], '/') == 0))
+        {
+            $hostparts = explode('.', $parts['host']);
+
+            # Try to catch common idiom of nickname.service.tld
+
+            if ((count($hostparts) > 2) &&
+                (strlen($hostparts[count($hostparts) - 2]) > 3) && # try to skip .co.uk, .com.au
+                (strcmp($hostparts[0], 'www') != 0))
+            {
+                return $this->nicknamize($hostparts[0]);
+            } else {
+                # Do the whole hostname
+                return $this->nicknamize($parts['host']);
+            }
+        } else {
+            if (array_key_exists('path', $parts)) {
+                # Strip starting, ending slashes
+                $path = preg_replace('@/$@', '', $parts['path']);
+                $path = preg_replace('@^/@', '', $path);
+                if (strpos($path, '/') === false) {
+                    return $this->nicknamize($path);
+                }
+            }
+        }
+
+        return null;
+    }
+
+    function xriToNickname($xri)
+    {
+        $base = $this->xriBase($xri);
+
+        if (!$base) {
+            return null;
+        } else {
+            # =evan.prodromou
+            # or @gratis*evan.prodromou
+            $parts = explode('*', substr($base, 1));
+            return $this->nicknamize(array_pop($parts));
+        }
+    }
+
+    function xriBase($xri)
+    {
+        if (substr($xri, 0, 6) == 'xri://') {
+            return substr($xri, 6);
+        } else {
+            return $xri;
+        }
+    }
+
+    # Given a string, try to make it work as a nickname
+
+    function nicknamize($str)
+    {
+        $str = preg_replace('/\W/', '', $str);
+        return strtolower($str);
+    }
+}
diff --git a/plugins/OpenID/openid.php b/plugins/OpenID/openid.php
new file mode 100644
index 000000000..0b7633284
--- /dev/null
+++ b/plugins/OpenID/openid.php
@@ -0,0 +1,280 @@
+<?php
+/*
+ * Laconica - a distributed open-source microblogging tool
+ * Copyright (C) 2008, 2009, Control Yourself, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+if (!defined('LACONICA')) { exit(1); }
+
+require_once(INSTALLDIR.'/classes/User_openid.php');
+
+require_once('Auth/OpenID.php');
+require_once('Auth/OpenID/Consumer.php');
+require_once('Auth/OpenID/SReg.php');
+require_once('Auth/OpenID/MySQLStore.php');
+
+# About one year cookie expiry
+
+define('OPENID_COOKIE_EXPIRY', round(365.25 * 24 * 60 * 60));
+define('OPENID_COOKIE_KEY', 'lastusedopenid');
+
+function oid_store()
+{
+    static $store = null;
+    if (!$store) {
+        # Can't be called statically
+        $user = new User();
+        $conn = $user->getDatabaseConnection();
+        $store = new Auth_OpenID_MySQLStore($conn);
+    }
+    return $store;
+}
+
+function oid_consumer()
+{
+    $store = oid_store();
+    $consumer = new Auth_OpenID_Consumer($store);
+    return $consumer;
+}
+
+function oid_clear_last()
+{
+    oid_set_last('');
+}
+
+function oid_set_last($openid_url)
+{
+    common_set_cookie(OPENID_COOKIE_KEY,
+                     $openid_url,
+                     time() + OPENID_COOKIE_EXPIRY);
+}
+
+function oid_get_last()
+{
+    if (empty($_COOKIE[OPENID_COOKIE_KEY])) {
+        return null;
+    }
+    $openid_url = $_COOKIE[OPENID_COOKIE_KEY];
+    if ($openid_url && strlen($openid_url) > 0) {
+        return $openid_url;
+    } else {
+        return null;
+    }
+}
+
+function oid_link_user($id, $canonical, $display)
+{
+
+    $oid = new User_openid();
+    $oid->user_id = $id;
+    $oid->canonical = $canonical;
+    $oid->display = $display;
+    $oid->created = DB_DataObject_Cast::dateTime();
+
+    if (!$oid->insert()) {
+        $err = PEAR::getStaticProperty('DB_DataObject','lastError');
+        common_debug('DB error ' . $err->code . ': ' . $err->message, __FILE__);
+        return false;
+    }
+
+    return true;
+}
+
+function oid_get_user($openid_url)
+{
+    $user = null;
+    $oid = User_openid::staticGet('canonical', $openid_url);
+    if ($oid) {
+        $user = User::staticGet('id', $oid->user_id);
+    }
+    return $user;
+}
+
+function oid_check_immediate($openid_url, $backto=null)
+{
+    if (!$backto) {
+        $action = $_REQUEST['action'];
+        $args = common_copy_args($_GET);
+        unset($args['action']);
+        $backto = common_local_url($action, $args);
+    }
+    common_debug('going back to "' . $backto . '"', __FILE__);
+
+    common_ensure_session();
+
+    $_SESSION['openid_immediate_backto'] = $backto;
+    common_debug('passed-in variable is "' . $backto . '"', __FILE__);
+    common_debug('session variable is "' . $_SESSION['openid_immediate_backto'] . '"', __FILE__);
+
+    oid_authenticate($openid_url,
+                     'finishimmediate',
+                     true);
+}
+
+function oid_authenticate($openid_url, $returnto, $immediate=false)
+{
+
+    $consumer = oid_consumer();
+
+    if (!$consumer) {
+        common_server_error(_('Cannot instantiate OpenID consumer object.'));
+        return false;
+    }
+
+    common_ensure_session();
+
+    $auth_request = $consumer->begin($openid_url);
+
+    // Handle failure status return values.
+    if (!$auth_request) {
+        return _('Not a valid OpenID.');
+    } else if (Auth_OpenID::isFailure($auth_request)) {
+        return sprintf(_('OpenID failure: %s'), $auth_request->message);
+    }
+
+    $sreg_request = Auth_OpenID_SRegRequest::build(// Required
+                                                   array(),
+                                                   // Optional
+                                                   array('nickname',
+                                                         'email',
+                                                         'fullname',
+                                                         'language',
+                                                         'timezone',
+                                                         'postcode',
+                                                         'country'));
+
+    if ($sreg_request) {
+        $auth_request->addExtension($sreg_request);
+    }
+
+    $trust_root = common_root_url(true);
+    $process_url = common_local_url($returnto);
+
+    if ($auth_request->shouldSendRedirect()) {
+        $redirect_url = $auth_request->redirectURL($trust_root,
+                                                   $process_url,
+                                                   $immediate);
+        if (!$redirect_url) {
+        } else if (Auth_OpenID::isFailure($redirect_url)) {
+            return sprintf(_('Could not redirect to server: %s'), $redirect_url->message);
+        } else {
+            common_redirect($redirect_url, 303);
+        }
+    } else {
+        // Generate form markup and render it.
+        $form_id = 'openid_message';
+        $form_html = $auth_request->formMarkup($trust_root, $process_url,
+                                               $immediate, array('id' => $form_id));
+
+        # XXX: This is cheap, but things choke if we don't escape ampersands
+        # in the HTML attributes
+
+        $form_html = preg_replace('/&/', '&amp;', $form_html);
+
+        // Display an error if the form markup couldn't be generated;
+        // otherwise, render the HTML.
+        if (Auth_OpenID::isFailure($form_html)) {
+            common_server_error(sprintf(_('Could not create OpenID form: %s'), $form_html->message));
+        } else {
+            $action = new AutosubmitAction(); // see below
+            $action->form_html = $form_html;
+            $action->form_id = $form_id;
+            $action->prepare(array('action' => 'autosubmit'));
+            $action->handle(array('action' => 'autosubmit'));
+        }
+    }
+}
+
+# Half-assed attempt at a module-private function
+
+function _oid_print_instructions()
+{
+    common_element('div', 'instructions',
+                   _('This form should automatically submit itself. '.
+                      'If not, click the submit button to go to your '.
+                      'OpenID provider.'));
+}
+
+# update a user from sreg parameters
+
+function oid_update_user(&$user, &$sreg)
+{
+
+    $profile = $user->getProfile();
+
+    $orig_profile = clone($profile);
+
+    if ($sreg['fullname'] && strlen($sreg['fullname']) <= 255) {
+        $profile->fullname = $sreg['fullname'];
+    }
+
+    if ($sreg['country']) {
+        if ($sreg['postcode']) {
+            # XXX: use postcode to get city and region
+            # XXX: also, store postcode somewhere -- it's valuable!
+            $profile->location = $sreg['postcode'] . ', ' . $sreg['country'];
+        } else {
+            $profile->location = $sreg['country'];
+        }
+    }
+
+    # XXX save language if it's passed
+    # XXX save timezone if it's passed
+
+    if (!$profile->update($orig_profile)) {
+        common_server_error(_('Error saving the profile.'));
+        return false;
+    }
+
+    $orig_user = clone($user);
+
+    if ($sreg['email'] && Validate::email($sreg['email'], true)) {
+        $user->email = $sreg['email'];
+    }
+
+    if (!$user->update($orig_user)) {
+        common_server_error(_('Error saving the user.'));
+        return false;
+    }
+
+    return true;
+}
+
+class AutosubmitAction extends Action
+{
+    var $form_html = null;
+    var $form_id = null;
+
+    function handle($args)
+    {
+        parent::handle($args);
+        $this->showPage();
+    }
+
+    function title()
+    {
+        return _('OpenID Auto-Submit');
+    }
+
+    function showContent()
+    {
+        $this->raw($this->form_html);
+        $this->element('script', null,
+                       '$(document).ready(function() { ' .
+                       '    $(\'#'. $this->form_id .'\').submit(); '.
+                       '});');
+    }
+}
diff --git a/plugins/OpenID/openidlogin.php b/plugins/OpenID/openidlogin.php
new file mode 100644
index 000000000..a8d052096
--- /dev/null
+++ b/plugins/OpenID/openidlogin.php
@@ -0,0 +1,131 @@
+<?php
+/*
+ * Laconica - a distributed open-source microblogging tool
+ * Copyright (C) 2008, 2009, Control Yourself, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+if (!defined('LACONICA')) { exit(1); }
+
+require_once(INSTALLDIR.'/lib/openid.php');
+
+class OpenidloginAction extends Action
+{
+    function handle($args)
+    {
+        parent::handle($args);
+        if (common_is_real_login()) {
+            $this->clientError(_('Already logged in.'));
+        } else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
+            $openid_url = $this->trimmed('openid_url');
+
+            # CSRF protection
+            $token = $this->trimmed('token');
+            if (!$token || $token != common_session_token()) {
+                $this->showForm(_('There was a problem with your session token. Try again, please.'), $openid_url);
+                return;
+            }
+
+            $rememberme = $this->boolean('rememberme');
+
+            common_ensure_session();
+
+            $_SESSION['openid_rememberme'] = $rememberme;
+
+            $result = oid_authenticate($openid_url,
+                                       'finishopenidlogin');
+
+            if (is_string($result)) { # error message
+                unset($_SESSION['openid_rememberme']);
+                $this->showForm($result, $openid_url);
+            }
+        } else {
+            $openid_url = oid_get_last();
+            $this->showForm(null, $openid_url);
+        }
+    }
+
+    function getInstructions()
+    {
+        if (common_logged_in() && !common_is_real_login() &&
+            common_get_returnto()) {
+            // rememberme logins have to reauthenticate before
+            // changing any profile settings (cookie-stealing protection)
+            return _('For security reasons, please re-login with your ' .
+                     '[OpenID](%%doc.openid%%) ' .
+                     'before changing your settings.');
+        } else {
+            return _('Login with an [OpenID](%%doc.openid%%) account.');
+        }
+    }
+
+    function showPageNotice()
+    {
+        if ($this->error) {
+            $this->element('div', array('class' => 'error'), $this->error);
+        } else {
+            $instr = $this->getInstructions();
+            $output = common_markup_to_html($instr);
+            $this->elementStart('div', 'instructions');
+            $this->raw($output);
+            $this->elementEnd('div');
+        }
+    }
+
+    function title()
+    {
+        return _('OpenID Login');
+    }
+
+    function showForm($error=null, $openid_url)
+    {
+        $this->error = $error;
+        $this->openid_url = $openid_url;
+        $this->showPage();
+    }
+
+    function showContent() {
+        $formaction = common_local_url('openidlogin');
+        $this->elementStart('form', array('method' => 'post',
+                                           'id' => 'form_openid_login',
+                                           'class' => 'form_settings',
+                                           'action' => $formaction));
+        $this->elementStart('fieldset');
+        $this->element('legend', null, _('OpenID login'));
+        $this->hidden('token', common_session_token());
+
+        $this->elementStart('ul', 'form_data');
+        $this->elementStart('li');
+        $this->input('openid_url', _('OpenID URL'),
+                     $this->openid_url,
+                     _('Your OpenID URL'));
+        $this->elementEnd('li');
+        $this->elementStart('li', array('id' => 'settings_rememberme'));
+        $this->checkbox('rememberme', _('Remember me'), false,
+                        _('Automatically login in the future; ' .
+                           'not for shared computers!'));
+        $this->elementEnd('li');
+        $this->elementEnd('ul');
+        $this->submit('submit', _('Login'));
+        $this->elementEnd('fieldset');
+        $this->elementEnd('form');
+    }
+
+    function showLocalNav()
+    {
+        $nav = new LoginGroupNav($this);
+        $nav->show();
+    }
+}
diff --git a/plugins/OpenID/openidsettings.php b/plugins/OpenID/openidsettings.php
new file mode 100644
index 000000000..5f59ebc01
--- /dev/null
+++ b/plugins/OpenID/openidsettings.php
@@ -0,0 +1,234 @@
+<?php
+/**
+ * Laconica, the distributed open-source microblogging tool
+ *
+ * Settings for OpenID
+ *
+ * PHP version 5
+ *
+ * LICENCE: This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @category  Settings
+ * @package   Laconica
+ * @author    Evan Prodromou <evan@controlyourself.ca>
+ * @copyright 2008-2009 Control Yourself, Inc.
+ * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link      http://laconi.ca/
+ */
+
+if (!defined('LACONICA')) {
+    exit(1);
+}
+
+require_once INSTALLDIR.'/lib/accountsettingsaction.php';
+require_once INSTALLDIR.'/lib/openid.php';
+
+/**
+ * Settings for OpenID
+ *
+ * Lets users add, edit and delete OpenIDs from their account
+ *
+ * @category Settings
+ * @package  Laconica
+ * @author   Evan Prodromou <evan@controlyourself.ca>
+ * @license  http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link     http://laconi.ca/
+ */
+
+class OpenidsettingsAction extends AccountSettingsAction
+{
+    /**
+     * Title of the page
+     *
+     * @return string Page title
+     */
+
+    function title()
+    {
+        return _('OpenID settings');
+    }
+
+    /**
+     * Instructions for use
+     *
+     * @return string Instructions for use
+     */
+
+    function getInstructions()
+    {
+        return _('[OpenID](%%doc.openid%%) lets you log into many sites' .
+                 ' with the same user account.'.
+                 ' Manage your associated OpenIDs from here.');
+    }
+
+    /**
+     * Show the form for OpenID management
+     *
+     * We have one form with a few different submit buttons to do different things.
+     *
+     * @return void
+     */
+
+    function showContent()
+    {
+        $user = common_current_user();
+
+        $this->elementStart('form', array('method' => 'post',
+                                          'id' => 'form_settings_openid_add',
+                                          'class' => 'form_settings',
+                                          'action' =>
+                                          common_local_url('openidsettings')));
+        $this->elementStart('fieldset', array('id' => 'settings_openid_add'));
+        $this->element('legend', null, _('Add OpenID'));
+        $this->hidden('token', common_session_token());
+        $this->element('p', 'form_guide',
+                       _('If you want to add an OpenID to your account, ' .
+                         'enter it in the box below and click "Add".'));
+        $this->elementStart('ul', 'form_data');
+        $this->elementStart('li');
+        $this->element('label', array('for' => 'openid_url'),
+                       _('OpenID URL'));
+        $this->element('input', array('name' => 'openid_url',
+                                      'type' => 'text',
+                                      'id' => 'openid_url'));
+        $this->elementEnd('li');
+        $this->elementEnd('ul');
+        $this->element('input', array('type' => 'submit',
+                                      'id' => 'settings_openid_add_action-submit',
+                                      'name' => 'add',
+                                      'class' => 'submit',
+                                      'value' => _('Add')));
+        $this->elementEnd('fieldset');
+        $this->elementEnd('form');
+
+        $oid = new User_openid();
+
+        $oid->user_id = $user->id;
+
+        $cnt = $oid->find();
+
+        if ($cnt > 0) {
+
+            $this->element('h2', null, _('Remove OpenID'));
+
+            if ($cnt == 1 && !$user->password) {
+
+                $this->element('p', 'form_guide',
+                               _('Removing your only OpenID '.
+                                 'would make it impossible to log in! ' .
+                                 'If you need to remove it, '.
+                                 'add another OpenID first.'));
+
+                if ($oid->fetch()) {
+                    $this->elementStart('p');
+                    $this->element('a', array('href' => $oid->canonical),
+                                   $oid->display);
+                    $this->elementEnd('p');
+                }
+
+            } else {
+
+                $this->element('p', 'form_guide',
+                               _('You can remove an OpenID from your account '.
+                                 'by clicking the button marked "Remove".'));
+                $idx = 0;
+
+                while ($oid->fetch()) {
+                    $this->elementStart('form',
+                                        array('method' => 'POST',
+                                              'id' => 'form_settings_openid_delete' . $idx,
+                                              'class' => 'form_settings',
+                                              'action' =>
+                                              common_local_url('openidsettings')));
+                    $this->elementStart('fieldset');
+                    $this->hidden('token', common_session_token());
+                    $this->element('a', array('href' => $oid->canonical),
+                                   $oid->display);
+                    $this->element('input', array('type' => 'hidden',
+                                                  'id' => 'openid_url'.$idx,
+                                                  'name' => 'openid_url',
+                                                  'value' => $oid->canonical));
+                    $this->element('input', array('type' => 'submit',
+                                                  'id' => 'remove'.$idx,
+                                                  'name' => 'remove',
+                                                  'class' => 'submit remove',
+                                                  'value' => _('Remove')));
+                    $this->elementEnd('fieldset');
+                    $this->elementEnd('form');
+                    $idx++;
+                }
+            }
+        }
+    }
+
+    /**
+     * Handle a POST request
+     *
+     * Muxes to different sub-functions based on which button was pushed
+     *
+     * @return void
+     */
+
+    function handlePost()
+    {
+        // CSRF protection
+        $token = $this->trimmed('token');
+        if (!$token || $token != common_session_token()) {
+            $this->showForm(_('There was a problem with your session token. '.
+                              'Try again, please.'));
+            return;
+        }
+
+        if ($this->arg('add')) {
+            $result = oid_authenticate($this->trimmed('openid_url'),
+                                       'finishaddopenid');
+            if (is_string($result)) { // error message
+                $this->showForm($result);
+            }
+        } else if ($this->arg('remove')) {
+            $this->removeOpenid();
+        } else {
+            $this->showForm(_('Something weird happened.'));
+        }
+    }
+
+    /**
+     * Handles a request to remove an OpenID from the user's account
+     *
+     * Validates input and, if everything is OK, deletes the OpenID.
+     * Reloads the form with a success or error notification.
+     *
+     * @return void
+     */
+
+    function removeOpenid()
+    {
+        $openid_url = $this->trimmed('openid_url');
+
+        $oid = User_openid::staticGet('canonical', $openid_url);
+
+        if (!$oid) {
+            $this->showForm(_('No such OpenID.'));
+            return;
+        }
+        $cur = common_current_user();
+        if (!$cur || $oid->user_id != $cur->id) {
+            $this->showForm(_('That OpenID does not belong to you.'));
+            return;
+        }
+        $oid->delete();
+        $this->showForm(_('OpenID removed.'), true);
+        return;
+    }
+}
diff --git a/plugins/OpenID/publicxrds.php b/plugins/OpenID/publicxrds.php
new file mode 100644
index 000000000..0a1421550
--- /dev/null
+++ b/plugins/OpenID/publicxrds.php
@@ -0,0 +1,122 @@
+<?php
+
+/**
+ * Public XRDS for OpenID
+ *
+ * PHP version 5
+ *
+ * @category Action
+ * @package  Laconica
+ * @author   Evan Prodromou <evan@controlyourself.ca>
+ * @author   Robin Millette <millette@controlyourself.ca>
+ * @license  http://www.fsf.org/licensing/licenses/agpl.html AGPLv3
+ * @link     http://laconi.ca/
+ *
+ * Laconica - a distributed open-source microblogging tool
+ * Copyright (C) 2008, 2009, Control Yourself, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+if (!defined('LACONICA')) {
+    exit(1);
+}
+
+require_once INSTALLDIR.'/lib/openid.php';
+
+/**
+ * Public XRDS for OpenID
+ *
+ * @category Action
+ * @package  Laconica
+ * @author   Evan Prodromou <evan@controlyourself.ca>
+ * @author   Robin Millette <millette@controlyourself.ca>
+ * @license  http://www.fsf.org/licensing/licenses/agpl.html AGPLv3
+ * @link     http://laconi.ca/
+ *
+ * @todo factor out similarities with XrdsAction
+ */
+class PublicxrdsAction extends Action
+{
+    /**
+     * Is read only?
+     *
+     * @return boolean true
+     */
+    function isReadOnly($args)
+    {
+        return true;
+    }
+
+    /**
+     * Class handler.
+     *
+     * @param array $args array of arguments
+     *
+     * @return nothing
+     */
+    function handle($args)
+    {
+        parent::handle($args);
+        header('Content-Type: application/xrds+xml');
+        $this->startXML();
+        $this->elementStart('XRDS', array('xmlns' => 'xri://$xrds'));
+        $this->elementStart('XRD', array('xmlns' => 'xri://$xrd*($v*2.0)',
+                                          'xmlns:simple' => 'http://xrds-simple.net/core/1.0',
+                                          'version' => '2.0'));
+        $this->element('Type', null, 'xri://$xrds*simple');
+        foreach (array('finishopenidlogin', 'finishaddopenid') as $finish) {
+            $this->showService(Auth_OpenID_RP_RETURN_TO_URL_TYPE,
+                                common_local_url($finish));
+        }
+        $this->elementEnd('XRD');
+        $this->elementEnd('XRDS');
+        $this->endXML();
+    }
+
+    /**
+     * Show service.
+     *
+     * @param string $type    XRDS type
+     * @param string $uri     URI
+     * @param array  $params  type parameters, null by default
+     * @param array  $sigs    type signatures, null by default
+     * @param string $localId local ID, null by default
+     *
+     * @return void
+     */
+    function showService($type, $uri, $params=null, $sigs=null, $localId=null)
+    {
+        $this->elementStart('Service');
+        if ($uri) {
+            $this->element('URI', null, $uri);
+        }
+        $this->element('Type', null, $type);
+        if ($params) {
+            foreach ($params as $param) {
+                $this->element('Type', null, $param);
+            }
+        }
+        if ($sigs) {
+            foreach ($sigs as $sig) {
+                $this->element('Type', null, $sig);
+            }
+        }
+        if ($localId) {
+            $this->element('LocalID', null, $localId);
+        }
+        $this->elementEnd('Service');
+    }
+}
+
diff --git a/plugins/OpenID/xrds.php b/plugins/OpenID/xrds.php
new file mode 100644
index 000000000..9327a3c83
--- /dev/null
+++ b/plugins/OpenID/xrds.php
@@ -0,0 +1,173 @@
+<?php
+
+/**
+ * XRDS for OpenID
+ *
+ * PHP version 5
+ *
+ * @category Action
+ * @package  Laconica
+ * @author   Evan Prodromou <evan@controlyourself.ca>
+ * @author   Robin Millette <millette@controlyourself.ca>
+ * @license  http://www.fsf.org/licensing/licenses/agpl.html AGPLv3
+ * @link     http://laconi.ca/
+ *
+ * Laconica - a distributed open-source microblogging tool
+ * Copyright (C) 2008, 2009, Control Yourself, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+if (!defined('LACONICA')) {
+    exit(1);
+}
+
+require_once INSTALLDIR.'/lib/omb.php';
+
+/**
+ * XRDS for OpenID
+ *
+ * @category Action
+ * @package  Laconica
+ * @author   Evan Prodromou <evan@controlyourself.ca>
+ * @author   Robin Millette <millette@controlyourself.ca>
+ * @license  http://www.fsf.org/licensing/licenses/agpl.html AGPLv3
+ * @link     http://laconi.ca/
+ */
+class XrdsAction extends Action
+{
+    /**
+     * Is read only?
+     *
+     * @return boolean true
+     */
+    function isReadOnly($args)
+    {
+        return true;
+    }
+
+    /**
+     * Class handler.
+     *
+     * @param array $args query arguments
+     *
+     * @return void
+     */
+    function handle($args)
+    {
+        parent::handle($args);
+        $nickname = $this->trimmed('nickname');
+        $user     = User::staticGet('nickname', $nickname);
+        if (!$user) {
+            $this->clientError(_('No such user.'));
+            return;
+        }
+        $this->showXrds($user);
+    }
+
+    /**
+     * Show XRDS for a user.
+     *
+     * @param class $user XRDS for this user.
+     *
+     * @return void
+     */
+    function showXrds($user)
+    {
+        header('Content-Type: application/xrds+xml');
+        $this->startXML();
+        $this->elementStart('XRDS', array('xmlns' => 'xri://$xrds'));
+
+        $this->elementStart('XRD', array('xmlns' => 'xri://$xrd*($v*2.0)',
+                                          'xml:id' => 'oauth',
+                                          'xmlns:simple' => 'http://xrds-simple.net/core/1.0',
+                                          'version' => '2.0'));
+        $this->element('Type', null, 'xri://$xrds*simple');
+        $this->showService(OAUTH_ENDPOINT_REQUEST,
+                            common_local_url('requesttoken'),
+                            array(OAUTH_AUTH_HEADER, OAUTH_POST_BODY),
+                            array(OAUTH_HMAC_SHA1),
+                            $user->uri);
+        $this->showService(OAUTH_ENDPOINT_AUTHORIZE,
+                            common_local_url('userauthorization'),
+                            array(OAUTH_AUTH_HEADER, OAUTH_POST_BODY),
+                            array(OAUTH_HMAC_SHA1));
+        $this->showService(OAUTH_ENDPOINT_ACCESS,
+                            common_local_url('accesstoken'),
+                            array(OAUTH_AUTH_HEADER, OAUTH_POST_BODY),
+                            array(OAUTH_HMAC_SHA1));
+        $this->showService(OAUTH_ENDPOINT_RESOURCE,
+                            null,
+                            array(OAUTH_AUTH_HEADER, OAUTH_POST_BODY),
+                            array(OAUTH_HMAC_SHA1));
+        $this->elementEnd('XRD');
+
+        // XXX: decide whether to include user's ID/nickname in postNotice URL
+        $this->elementStart('XRD', array('xmlns' => 'xri://$xrd*($v*2.0)',
+                                          'xml:id' => 'omb',
+                                          'xmlns:simple' => 'http://xrds-simple.net/core/1.0',
+                                          'version' => '2.0'));
+        $this->element('Type', null, 'xri://$xrds*simple');
+        $this->showService(OMB_ENDPOINT_POSTNOTICE,
+                            common_local_url('postnotice'));
+        $this->showService(OMB_ENDPOINT_UPDATEPROFILE,
+                            common_local_url('updateprofile'));
+        $this->elementEnd('XRD');
+        $this->elementStart('XRD', array('xmlns' => 'xri://$xrd*($v*2.0)',
+                                          'version' => '2.0'));
+        $this->element('Type', null, 'xri://$xrds*simple');
+        $this->showService(OAUTH_DISCOVERY,
+                            '#oauth');
+        $this->showService(OMB_NAMESPACE,
+                            '#omb');
+        $this->elementEnd('XRD');
+        $this->elementEnd('XRDS');
+        $this->endXML();
+    }
+
+    /**
+     * Show service.
+     *
+     * @param string $type    XRDS type
+     * @param string $uri     URI
+     * @param array  $params  type parameters, null by default
+     * @param array  $sigs    type signatures, null by default
+     * @param string $localId local ID, null by default
+     *
+     * @return void
+     */
+    function showService($type, $uri, $params=null, $sigs=null, $localId=null)
+    {
+        $this->elementStart('Service');
+        if ($uri) {
+            $this->element('URI', null, $uri);
+        }
+        $this->element('Type', null, $type);
+        if ($params) {
+            foreach ($params as $param) {
+                $this->element('Type', null, $param);
+            }
+        }
+        if ($sigs) {
+            foreach ($sigs as $sig) {
+                $this->element('Type', null, $sig);
+            }
+        }
+        if ($localId) {
+            $this->element('LocalID', null, $localId);
+        }
+        $this->elementEnd('Service');
+    }
+}
+