]> git.mxchange.org Git - quix0rs-gnu-social.git/blobdiff - actions/finishopenidlogin.php
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[quix0rs-gnu-social.git] / actions / finishopenidlogin.php
index 766a08b208a60778e9edccc3ce1345d86e29a58f..a2a778f31081f4c51ceda1d1c7a279919ec01123 100644 (file)
@@ -23,414 +23,414 @@ require_once(INSTALLDIR.'/lib/openid.php');
 
 class FinishopenidloginAction extends Action {
 
-       function handle($args) {
-               parent::handle($args);
-               if (common_logged_in()) {
-                       common_user_error(_('Already logged in.'));
-               } else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
-                       $token = $this->trimmed('token');
-                       if (!$token || $token != common_session_token()) {
-                               $this->show_form(_('There was a problem with your session token. Try again, please.'));
-                               return;
-                       }
-                       if ($this->arg('create')) {
-                               if (!$this->boolean('license')) {
-                                       $this->show_form(_('You can\'t register if you don\'t agree to the license.'),
-                                                                        $this->trimmed('newname'));
-                                       return;
-                               }
-                               $this->create_new_user();
-                       } else if ($this->arg('connect')) {
-                               $this->connect_user();
-                       } else {
-                               common_debug(print_r($this->args, true), __FILE__);
-                               $this->show_form(_('Something weird happened.'),
-                                                                $this->trimmed('newname'));
-                       }
-               } else {
-                       $this->try_login();
-               }
-       }
-
-       function show_top($error=NULL) {
-               if ($error) {
-                       common_element('div', array('class' => 'error'), $error);
-               } else {
-                       global $config;
-                       common_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.'), $config['site']['name']));
-               }
-       }
-
-       function show_form($error=NULL, $username=NULL) {
-               common_show_header(_('OpenID Account Setup'), NULL, $error,
-                                                  array($this, 'show_top'));
-
-               common_element_start('form', array('method' => 'post',
-                                                                                  'id' => 'account_connect',
-                                                                                  'action' => common_local_url('finishopenidlogin')));
-               common_hidden('token', common_session_token());
-               common_element('h2', NULL,
-                                          _('Create new account'));
-               common_element('p', NULL,
-                                          _('Create a new user with this nickname.'));
-               common_input('newname', _('New nickname'),
-                                        ($username) ? $username : '',
-                                        _('1-64 lowercase letters or numbers, no punctuation or spaces'));
-               common_element_start('p');
-               common_element('input', array('type' => 'checkbox',
-                                                                         'id' => 'license',
-                                                                         'name' => 'license',
-                                                                         'value' => 'true'));
-               common_text(_('My text and files are available under '));
-               common_element('a', array(href => common_config('license', 'url')),
-                                          common_config('license', 'title'));
-               common_text(_(' except this private data: password, email address, IM address, phone number.'));
-               common_element_end('p');
-               common_submit('create', _('Create'));
-               common_element('h2', NULL,
-                                          _('Connect existing account'));
-               common_element('p', NULL,
-                                          _('If you already have an account, login with your username and password to connect it to your OpenID.'));
-               common_input('nickname', _('Existing nickname'));
-               common_password('password', _('Password'));
-               common_submit('connect', _('Connect'));
-               common_element_end('form');
-               common_show_footer();
-       }
-
-       function try_login() {
-
-               $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);
-                               }
+    function handle($args) {
+        parent::handle($args);
+        if (common_logged_in()) {
+            common_user_error(_('Already logged in.'));
+        } else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
+            $token = $this->trimmed('token');
+            if (!$token || $token != common_session_token()) {
+                $this->show_form(_('There was a problem with your session token. Try again, please.'));
+                return;
+            }
+            if ($this->arg('create')) {
+                if (!$this->boolean('license')) {
+                    $this->show_form(_('You can\'t register if you don\'t agree to the license.'),
+                                     $this->trimmed('newname'));
+                    return;
+                }
+                $this->create_new_user();
+            } else if ($this->arg('connect')) {
+                $this->connect_user();
+            } else {
+                common_debug(print_r($this->args, true), __FILE__);
+                $this->show_form(_('Something weird happened.'),
+                                 $this->trimmed('newname'));
+            }
+        } else {
+            $this->try_login();
+        }
+    }
+
+    function show_top($error=NULL) {
+        if ($error) {
+            common_element('div', array('class' => 'error'), $error);
+        } else {
+            global $config;
+            common_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.'), $config['site']['name']));
+        }
+    }
+
+    function show_form($error=NULL, $username=NULL) {
+        common_show_header(_('OpenID Account Setup'), NULL, $error,
+                           array($this, 'show_top'));
+
+        common_element_start('form', array('method' => 'post',
+                                           'id' => 'account_connect',
+                                           'action' => common_local_url('finishopenidlogin')));
+        common_hidden('token', common_session_token());
+        common_element('h2', NULL,
+                       _('Create new account'));
+        common_element('p', NULL,
+                       _('Create a new user with this nickname.'));
+        common_input('newname', _('New nickname'),
+                     ($username) ? $username : '',
+                     _('1-64 lowercase letters or numbers, no punctuation or spaces'));
+        common_element_start('p');
+        common_element('input', array('type' => 'checkbox',
+                                      'id' => 'license',
+                                      'name' => 'license',
+                                      'value' => 'true'));
+        common_text(_('My text and files are available under '));
+        common_element('a', array(href => common_config('license', 'url')),
+                       common_config('license', 'title'));
+        common_text(_(' except this private data: password, email address, IM address, phone number.'));
+        common_element_end('p');
+        common_submit('create', _('Create'));
+        common_element('h2', NULL,
+                       _('Connect existing account'));
+        common_element('p', NULL,
+                       _('If you already have an account, login with your username and password to connect it to your OpenID.'));
+        common_input('nickname', _('Existing nickname'));
+        common_password('password', _('Password'));
+        common_submit('connect', _('Connect'));
+        common_element_end('form');
+        common_show_footer();
+    }
+
+    function try_login() {
+
+        $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']);
-                               $this->go_home($user->nickname);
-                       } else {
-                               $this->save_values($display, $canonical, $sreg);
-                               $this->show_form(NULL, $this->best_new_nickname($display, $sreg));
-                       }
-               }
-       }
-
-       function message($msg) {
-               common_show_header(_('OpenID Login'));
-               common_element('p', NULL, $msg);
-               common_show_footer();
-       }
-
-       function save_values($display, $canonical, $sreg) {
-               common_ensure_session();
-               $_SESSION['openid_display'] = $display;
-               $_SESSION['openid_canonical'] = $canonical;
-               $_SESSION['openid_sreg'] = $sreg;
-       }
-
-       function get_saved_values() {
-               return array($_SESSION['openid_display'],
-                                        $_SESSION['openid_canonical'],
-                                        $_SESSION['openid_sreg']);
-       }
-
-       function create_new_user() {
+                $this->go_home($user->nickname);
+            } else {
+                $this->save_values($display, $canonical, $sreg);
+                $this->show_form(NULL, $this->best_new_nickname($display, $sreg));
+            }
+        }
+    }
+
+    function message($msg) {
+        common_show_header(_('OpenID Login'));
+        common_element('p', NULL, $msg);
+        common_show_footer();
+    }
+
+    function save_values($display, $canonical, $sreg) {
+        common_ensure_session();
+        $_SESSION['openid_display'] = $display;
+        $_SESSION['openid_canonical'] = $canonical;
+        $_SESSION['openid_sreg'] = $sreg;
+    }
+
+    function get_saved_values() {
+        return array($_SESSION['openid_display'],
+                     $_SESSION['openid_canonical'],
+                     $_SESSION['openid_sreg']);
+    }
+
+    function create_new_user() {
 
         # FIXME: save invite code before redirect, and check here
 
-               if (common_config('site', 'closed') || common_config('site', 'inviteonly')) {
-                       common_user_error(_('Registration not allowed.'));
+        if (common_config('site', 'closed') || common_config('site', 'inviteonly')) {
+            common_user_error(_('Registration not allowed.'));
             return;
         }
 
-               $nickname = $this->trimmed('newname');
+        $nickname = $this->trimmed('newname');
 
-               if (!Validate::string($nickname, array('min_length' => 1,
-                                                                                          'max_length' => 64,
-                                                                                          'format' => VALIDATE_NUM . VALIDATE_ALPHA_LOWER))) {
-                       $this->show_form(_('Nickname must have only lowercase letters and numbers and no spaces.'));
-                       return;
-               }
+        if (!Validate::string($nickname, array('min_length' => 1,
+                                               'max_length' => 64,
+                                               'format' => VALIDATE_NUM . VALIDATE_ALPHA_LOWER))) {
+            $this->show_form(_('Nickname must have only lowercase letters and numbers and no spaces.'));
+            return;
+        }
 
-               if (!User::allowed_nickname($nickname)) {
-                       $this->show_form(_('Nickname not allowed.'));
-                       return;
-               }
+        if (!User::allowed_nickname($nickname)) {
+            $this->show_form(_('Nickname not allowed.'));
+            return;
+        }
 
-               if (User::staticGet('nickname', $nickname)) {
-                       $this->show_form(_('Nickname already in use. Try another one.'));
-                       return;
-               }
+        if (User::staticGet('nickname', $nickname)) {
+            $this->show_form(_('Nickname already in use. Try another one.'));
+            return;
+        }
 
-               list($display, $canonical, $sreg) = $this->get_saved_values();
+        list($display, $canonical, $sreg) = $this->get_saved_values();
 
-               if (!$display || !$canonical) {
-                       common_server_error(_('Stored OpenID not found.'));
-                       return;
-               }
+        if (!$display || !$canonical) {
+            common_server_error(_('Stored OpenID not found.'));
+            return;
+        }
 
-               # Possible race condition... let's be paranoid
+        # Possible race condition... let's be paranoid
 
-               $other = oid_get_user($canonical);
+        $other = oid_get_user($canonical);
 
-               if ($other) {
-                       common_server_error(_('Creating new account for OpenID that already has a user.'));
-                       return;
-               }
+        if ($other) {
+            common_server_error(_('Creating new account for OpenID that already has a user.'));
+            return;
+        }
 
-               if ($sreg['country']) {
-                       if ($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 = $sreg['country'];
-                       }
-               }
+        if ($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 ($sreg['fullname'] && strlen($sreg['fullname']) <= 255) {
-                       $fullname = $sreg['fullname'];
-               }
+        if ($sreg['fullname'] && strlen($sreg['fullname']) <= 255) {
+            $fullname = $sreg['fullname'];
+        }
 
-               if ($sreg['email'] && Validate::email($sreg['email'], true)) {
-                       $email = $sreg['email'];
-               }
+        if ($sreg['email'] && Validate::email($sreg['email'], true)) {
+            $email = $sreg['email'];
+        }
 
-               # XXX: add language
-               # XXX: add timezone
+        # XXX: add language
+        # XXX: add timezone
 
-               $user = User::register(array('nickname' => $nickname,
-                                                                        'email' => $email,
-                                                                        'fullname' => $fullname,
-                                                                        'location' => $location));
+        $user = User::register(array('nickname' => $nickname,
+                                     'email' => $email,
+                                     'fullname' => $fullname,
+                                     'location' => $location));
 
-               $result = oid_link_user($user->id, $canonical, $display);
+        $result = oid_link_user($user->id, $canonical, $display);
 
-               oid_set_last($display);
-               common_set_user($user);
-               common_real_login(true);
+        oid_set_last($display);
+        common_set_user($user);
+        common_real_login(true);
         if (isset($_SESSION['openid_rememberme']) && $_SESSION['openid_rememberme']) {
-                       common_rememberme($user);
-               }
+            common_rememberme($user);
+        }
         unset($_SESSION['openid_rememberme']);
-               common_redirect(common_local_url('showstream', array('nickname' => $user->nickname)));
-       }
+        common_redirect(common_local_url('showstream', array('nickname' => $user->nickname)));
+    }
 
-       function connect_user() {
+    function connect_user() {
 
-               $nickname = $this->trimmed('nickname');
-               $password = $this->trimmed('password');
+        $nickname = $this->trimmed('nickname');
+        $password = $this->trimmed('password');
 
-               if (!common_check_user($nickname, $password)) {
-                       $this->show_form(_('Invalid username or password.'));
-                       return;
-               }
+        if (!common_check_user($nickname, $password)) {
+            $this->show_form(_('Invalid username or password.'));
+            return;
+        }
 
-               # They're legit!
+        # They're legit!
 
-               $user = User::staticGet('nickname', $nickname);
+        $user = User::staticGet('nickname', $nickname);
 
-               list($display, $canonical, $sreg) = $this->get_saved_values();
+        list($display, $canonical, $sreg) = $this->get_saved_values();
 
-               if (!$display || !$canonical) {
-                       common_server_error(_('Stored OpenID not found.'));
-                       return;
-               }
+        if (!$display || !$canonical) {
+            common_server_error(_('Stored OpenID not found.'));
+            return;
+        }
 
-               $result = oid_link_user($user->id, $canonical, $display);
+        $result = oid_link_user($user->id, $canonical, $display);
 
-               if (!$result) {
-                       common_server_error(_('Error connecting user to OpenID.'));
-                       return;
-               }
+        if (!$result) {
+            common_server_error(_('Error connecting user to OpenID.'));
+            return;
+        }
 
-               oid_update_user($user, $sreg);
-               oid_set_last($display);
-               common_set_user($user);
-               common_real_login(true);
+        oid_update_user($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']);
-               $this->go_home($user->nickname);
-       }
-
-       function go_home($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);
-       }
-
-       function best_new_nickname($display, $sreg) {
-
-               # Try the passed-in nickname
-
-               if ($sreg['nickname']) {
-                       $nickname = $this->nicknamize($sreg['nickname']);
-                       if ($this->is_new_nickname($nickname)) {
-                               return $nickname;
-                       }
-               }
-
-               # Try the full name
-
-               if ($sreg['fullname']) {
-                       $fullname = $this->nicknamize($sreg['fullname']);
-                       if ($this->is_new_nickname($fullname)) {
-                               return $fullname;
-                       }
-               }
-
-               # Try the URL
-
-               $from_url = $this->openid_to_nickname($display);
-
-               if ($from_url && $this->is_new_nickname($from_url)) {
-                       return $from_url;
-               }
-
-               # XXX: others?
-
-               return NULL;
-       }
-
-       function is_new_nickname($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', $str)) {
-                       return false;
-               }
-               return true;
-       }
-
-       function openid_to_nickname($openid) {
+            common_rememberme($user);
+        }
+        unset($_SESSION['openid_rememberme']);
+        $this->go_home($user->nickname);
+    }
+
+    function go_home($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);
+    }
+
+    function best_new_nickname($display, $sreg) {
+
+        # Try the passed-in nickname
+
+        if ($sreg['nickname']) {
+            $nickname = $this->nicknamize($sreg['nickname']);
+            if ($this->is_new_nickname($nickname)) {
+                return $nickname;
+            }
+        }
+
+        # Try the full name
+
+        if ($sreg['fullname']) {
+            $fullname = $this->nicknamize($sreg['fullname']);
+            if ($this->is_new_nickname($fullname)) {
+                return $fullname;
+            }
+        }
+
+        # Try the URL
+
+        $from_url = $this->openid_to_nickname($display);
+
+        if ($from_url && $this->is_new_nickname($from_url)) {
+            return $from_url;
+        }
+
+        # XXX: others?
+
+        return NULL;
+    }
+
+    function is_new_nickname($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', $str)) {
+            return false;
+        }
+        return true;
+    }
+
+    function openid_to_nickname($openid) {
         if (Auth_Yadis_identifierScheme($openid) == 'XRI') {
-                       return $this->xri_to_nickname($openid);
-               } else {
-                       return $this->url_to_nickname($openid);
-               }
-       }
+            return $this->xri_to_nickname($openid);
+        } else {
+            return $this->url_to_nickname($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
+    # 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 url_to_nickname($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 xri_to_nickname($xri) {
-               $base = $this->xri_base($xri);
-
-               if (!$base) {
-                       return NULL;
-               } else {
-                       # =evan.prodromou
-                       # or @gratis*evan.prodromou
-                       $parts = explode('*', substr($base, 1));
-                       return $this->nicknamize(array_pop($parts));
-               }
-       }
-
-       function xri_base($xri) {
-               if (substr($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);
-       }
+        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 xri_to_nickname($xri) {
+        $base = $this->xri_base($xri);
+
+        if (!$base) {
+            return NULL;
+        } else {
+            # =evan.prodromou
+            # or @gratis*evan.prodromou
+            $parts = explode('*', substr($base, 1));
+            return $this->nicknamize(array_pop($parts));
+        }
+    }
+
+    function xri_base($xri) {
+        if (substr($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);
+    }
 }