]> git.mxchange.org Git - quix0rs-gnu-social.git/blobdiff - actions/userauthorization.php
Merge branch '0.8.x' into 0.9.x
[quix0rs-gnu-social.git] / actions / userauthorization.php
index ac0a0728cf29bec374f68ceede10408114aedebe..3e7be97479116dfe634b963a441228fd9e8c95bf 100644 (file)
@@ -1,7 +1,18 @@
 <?php
-/*
+/**
+ * Let the user authorize a remote subscription request
+ *
+ * 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, Controlez-Vous, Inc.
+ * 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
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-if (!defined('LACONICA')) { exit(1); }
+if (!defined('LACONICA')) {
+    exit(1);
+}
 
-require_once(INSTALLDIR.'/lib/omb.php');
+require_once INSTALLDIR.'/lib/omb.php';
+require_once INSTALLDIR.'/extlib/libomb/service_provider.php';
+require_once INSTALLDIR.'/extlib/libomb/profile.php';
 define('TIMESTAMP_THRESHOLD', 300);
 
-class UserauthorizationAction extends Action {
-
-       function handle($args) {
-               parent::handle($args);
-
-               if ($_SERVER['REQUEST_METHOD'] == 'POST') {
-                       # CSRF protection
-                       $token = $this->trimmed('token');
-                       if (!$token || $token != common_session_token()) {
-                               $req = $this->get_stored_request();
-                               $this->show_form(_('There was a problem with your session token. Try again, please.'), $req);
-                               return;
-                       }
-                       # We've shown the form, now post user's choice
-                       $this->send_authorization();
-               } else {
-                       if (!common_logged_in()) {
-                               # Go log in, and then come back
-                               common_debug('saving URL for returnto', __FILE__);
-                               common_set_returnto($_SERVER['REQUEST_URI']);
-
-                               common_debug('redirecting to login', __FILE__);
-                               common_redirect(common_local_url('login'));
-                               return;
-                       }
-                       try {
-                               # this must be a new request
-                               common_debug('getting new request', __FILE__);
-                               $req = $this->get_new_request();
-                               if (!$req) {
-                                       $this->client_error(_('No request found!'));
-                               }
-                               common_debug('validating request', __FILE__);
-                               # XXX: only validate new requests, since nonce is one-time use
-                               $this->validate_request($req);
-                               common_debug('showing form', __FILE__);
-                               $this->store_request($req);
-                               $this->show_form($req);
-                       } catch (OAuthException $e) {
-                               $this->clear_request();
-                               $this->client_error($e->getMessage());
-                               return;
-                       }
-
-               }
-       }
-
-       function show_form($req) {
-
-               $nickname = $req->get_parameter('omb_listenee_nickname');
-               $profile = $req->get_parameter('omb_listenee_profile');
-               $license = $req->get_parameter('omb_listenee_license');
-               $fullname = $req->get_parameter('omb_listenee_fullname');
-               $homepage = $req->get_parameter('omb_listenee_homepage');
-               $bio = $req->get_parameter('omb_listenee_bio');
-               $location = $req->get_parameter('omb_listenee_location');
-               $avatar = $req->get_parameter('omb_listenee_avatar');
-
-               common_show_header(_('Authorize subscription'));
-               common_element('p', NULL, _('Please check these details to make sure '.
-                                                                        'that you want to subscribe to this user\'s notices. '.
-                                                                        'If you didn\'t just ask to subscribe to someone\'s notices, '.
-                                                                        'click "Cancel".'));
-               common_element_start('div', 'profile');
-               if ($avatar) {
-                       common_element('img', array('src' => $avatar,
-                                                                               'class' => 'avatar profile',
-                                                                               'width' => AVATAR_PROFILE_SIZE,
-                                                                               'height' => AVATAR_PROFILE_SIZE,
-                                                                               'alt' => $nickname));
-               }
-               common_element('a', array('href' => $profile,
-                                                                 'class' => 'external profile nickname'),
-                                          $nickname);
-               if ($fullname) {
-                       common_element_start('div', 'fullname');
-                       if ($homepage) {
-                               common_element('a', array('href' => $homepage),
-                                                          $fullname);
-                       } else {
-                               common_text($fullname);
-                       }
-                       common_element_end('div');
-               }
-               if ($location) {
-                       common_element('div', 'location', $location);
-               }
-               if ($bio) {
-                       common_element('div', 'bio', $bio);
-               }
-               common_element_start('div', 'license');
-               common_element('a', array('href' => $license,
-                                                                 'class' => 'license'),
-                                          $license);
-               common_element_end('div');
-               common_element_end('div');
-               common_element_start('form', array('method' => 'post',
-                                                                                  'id' => 'userauthorization',
-                                                                                  'name' => 'userauthorization',
-                                                                                  'action' => common_local_url('userauthorization')));
-               common_hidden('token', common_session_token());
-               common_submit('accept', _('Accept'));
-               common_submit('reject', _('Reject'));
-               common_element_end('form');
-               common_show_footer();
-       }
-
-       function send_authorization() {
-               $req = $this->get_stored_request();
-
-               if (!$req) {
-                       common_user_error(_('No authorization request!'));
-                       return;
-               }
-
-               $callback = $req->get_parameter('oauth_callback');
-
-               if ($this->arg('accept')) {
-                       if (!$this->authorize_token($req)) {
-                               $this->client_error(_('Error authorizing token'));
-                       }
-                       if (!$this->save_remote_profile($req)) {
-                               $this->client_error(_('Error saving remote profile'));
-                       }
-                       if (!$callback) {
-                               $this->show_accept_message($req->get_parameter('oauth_token'));
-                       } else {
-                               $params = array();
-                               $params['oauth_token'] = $req->get_parameter('oauth_token');
-                               $params['omb_version'] = OMB_VERSION_01;
-                               $user = User::staticGet('uri', $req->get_parameter('omb_listener'));
-                               $profile = $user->getProfile();
-                               if (!$profile) {
-                                       common_log_db_error($user, 'SELECT', __FILE__);
-                                       $this->server_error(_('User without matching profile'));
-                                       return;
-                               }
-                               $params['omb_listener_nickname'] = $user->nickname;
-                               $params['omb_listener_profile'] = common_local_url('showstream',
-                                                                                                                                  array('nickname' => $user->nickname));
-                               if ($profile->fullname) {
-                                       $params['omb_listener_fullname'] = $profile->fullname;
-                               }
-                               if ($profile->homepage) {
-                                       $params['omb_listener_homepage'] = $profile->homepage;
-                               }
-                               if ($profile->bio) {
-                                       $params['omb_listener_bio'] = $profile->bio;
-                               }
-                               if ($profile->location) {
-                                       $params['omb_listener_location'] = $profile->location;
-                               }
-                               $avatar = $profile->getAvatar(AVATAR_PROFILE_SIZE);
-                               if ($avatar) {
-                                       $params['omb_listener_avatar'] = $avatar->url;
-                               }
-                               $parts = array();
-                               foreach ($params as $k => $v) {
-                                       $parts[] = $k . '=' . OAuthUtil::urlencodeRFC3986($v);
-                               }
-                               $query_string = implode('&', $parts);
-                               $parsed = parse_url($callback);
-                               $url = $callback . (($parsed['query']) ? '&' : '?') . $query_string;
-                               common_redirect($url, 303);
-                       }
-               } else {
-                       if (!$callback) {
-                               $this->show_reject_message();
-                       } else {
-                               # XXX: not 100% sure how to signal failure... just redirect without token?
-                               common_redirect($callback, 303);
-                       }
-               }
-       }
-
-       function authorize_token(&$req) {
-               $consumer_key = $req->get_parameter('oauth_consumer_key');
-               $token_field = $req->get_parameter('oauth_token');
-               common_debug('consumer key = "'.$consumer_key.'"', __FILE__);
-               common_debug('token field = "'.$token_field.'"', __FILE__);
-               $rt = new Token();
-               $rt->consumer_key = $consumer_key;
-               $rt->tok = $token_field;
-               $rt->type = 0;
-               $rt->state = 0;
-               common_debug('request token to look up: "'.print_r($rt,TRUE).'"');
-               if ($rt->find(true)) {
-                       common_debug('found request token to authorize', __FILE__);
-                       $orig_rt = clone($rt);
-                       $rt->state = 1; # Authorized but not used
-                       if ($rt->update($orig_rt)) {
-                               common_debug('updated request token so it is authorized', __FILE__);
-                               return true;
-                       }
-               }
-               return FALSE;
-       }
-
-       # XXX: refactor with similar code in finishremotesubscribe.php
-
-       function save_remote_profile(&$req) {
-               # FIXME: we should really do this when the consumer comes
-               # back for an access token. If they never do, we've got stuff in a
-               # weird state.
-
-               $nickname = $req->get_parameter('omb_listenee_nickname');
-               $fullname = $req->get_parameter('omb_listenee_fullname');
-               $profile_url = $req->get_parameter('omb_listenee_profile');
-               $homepage = $req->get_parameter('omb_listenee_homepage');
-               $bio = $req->get_parameter('omb_listenee_bio');
-               $location = $req->get_parameter('omb_listenee_location');
-               $avatar_url = $req->get_parameter('omb_listenee_avatar');
-
-               $listenee = $req->get_parameter('omb_listenee');
-               $remote = Remote_profile::staticGet('uri', $listenee);
-
-               if ($remote) {
-                       $exists = true;
-                       $profile = Profile::staticGet($remote->id);
-                       $orig_remote = clone($remote);
-                       $orig_profile = clone($profile);
-               } else {
-                       $exists = false;
-                       $remote = new Remote_profile();
-                       $remote->uri = $listenee;
-                       $profile = new Profile();
-               }
-
-               $profile->nickname = $nickname;
-               $profile->profileurl = $profile_url;
-
-               if ($fullname) {
-                       $profile->fullname = $fullname;
-               }
-               if ($homepage) {
-                       $profile->homepage = $homepage;
-               }
-               if ($bio) {
-                       $profile->bio = $bio;
-               }
-               if ($location) {
-                       $profile->location = $location;
-               }
-
-               if ($exists) {
-                       $profile->update($orig_profile);
-               } else {
-                       $profile->created = DB_DataObject_Cast::dateTime(); # current time
-                       $id = $profile->insert();
-                       if (!$id) {
-                               return FALSE;
-                       }
-                       $remote->id = $id;
-               }
-
-               if ($exists) {
-                       if (!$remote->update($orig_remote)) {
-                               return FALSE;
-                       }
-               } else {
-                       $remote->created = DB_DataObject_Cast::dateTime(); # current time
-                       if (!$remote->insert()) {
-                               return FALSE;
-                       }
-               }
-
-               if ($avatar_url) {
-                       if (!$this->add_avatar($profile, $avatar_url)) {
-                               return FALSE;
-                       }
-               }
-
-               $user = common_current_user();
-               $datastore = omb_oauth_datastore();
-               $consumer = $this->get_consumer($datastore, $req);
-               $token = $this->get_token($datastore, $req, $consumer);
-
-               $sub = new Subscription();
-               $sub->subscriber = $user->id;
-               $sub->subscribed = $remote->id;
-               $sub->token = $token->key; # NOTE: request token, not valid for use!
-               $sub->created = DB_DataObject_Cast::dateTime(); # current time
-
-               if (!$sub->insert()) {
-                       return FALSE;
-               }
-
-               return TRUE;
-       }
-
-       function add_avatar($profile, $url) {
-               $temp_filename = tempnam(sys_get_temp_dir(), 'listenee_avatar');
-               copy($url, $temp_filename);
-               return $profile->setOriginal($temp_filename);
-       }
-
-       function show_accept_message($tok) {
-               common_show_header(_('Subscription authorized'));
-               common_element('p', NULL,
-                                          _('The subscription has been authorized, but no '.
-                                                 'callback URL was passed. Check with the site\'s instructions for '.
-                                                 'details on how to authorize the subscription. Your subscription token is:'));
-               common_element('blockquote', 'token', $tok);
-               common_show_footer();
-       }
-
-       function show_reject_message($tok) {
-               common_show_header(_('Subscription rejected'));
-               common_element('p', NULL,
-                                          _('The subscription has been rejected, but no '.
-                                                 'callback URL was passed. Check with the site\'s instructions for '.
-                                                 'details on how to fully reject the subscription.'));
-               common_show_footer();
-       }
-
-       function store_request($req) {
-               common_ensure_session();
-               $_SESSION['userauthorizationrequest'] = $req;
-       }
-
-       function clear_request() {
-               common_ensure_session();
-               unset($_SESSION['userauthorizationrequest']);
-       }
-
-       function get_stored_request() {
-               common_ensure_session();
-               $req = $_SESSION['userauthorizationrequest'];
-               return $req;
-       }
-
-       function get_new_request() {
-               common_remove_magic_from_request();
-               $req = OAuthRequest::from_request();
-               return $req;
-       }
-
-       # Throws an OAuthException if anything goes wrong
-
-       function validate_request(&$req) {
-               # OAuth stuff -- have to copy from OAuth.php since they're
-               # all private methods, and there's no user-authentication method
-               common_debug('checking version', __FILE__);
-               $this->check_version($req);
-               common_debug('getting datastore', __FILE__);
-               $datastore = omb_oauth_datastore();
-               common_debug('getting consumer', __FILE__);
-               $consumer = $this->get_consumer($datastore, $req);
-               common_debug('getting token', __FILE__);
-               $token = $this->get_token($datastore, $req, $consumer);
-               common_debug('checking timestamp', __FILE__);
-               $this->check_timestamp($req);
-               common_debug('checking nonce', __FILE__);
-               $this->check_nonce($datastore, $req, $consumer, $token);
-               common_debug('checking signature', __FILE__);
-               $this->check_signature($req, $consumer, $token);
-               common_debug('validating omb stuff', __FILE__);
-               $this->validate_omb($req);
-               common_debug('done validating', __FILE__);
-               return true;
-       }
-
-       function validate_omb(&$req) {
-               foreach (array('omb_version', 'omb_listener', 'omb_listenee',
-                                          'omb_listenee_profile', 'omb_listenee_nickname',
-                                          'omb_listenee_license') as $param)
-               {
-                       if (!$req->get_parameter($param)) {
-                               throw new OAuthException("Required parameter '$param' not found");
-                       }
-               }
-               # Now, OMB stuff
-               $version = $req->get_parameter('omb_version');
-               if ($version != OMB_VERSION_01) {
-                       throw new OAuthException("OpenMicroBlogging version '$version' not supported");
-               }
-               $listener =     $req->get_parameter('omb_listener');
-               $user = User::staticGet('uri', $listener);
-               if (!$user) {
-                       throw new OAuthException("Listener URI '$listener' not found here");
-               }
-               $cur = common_current_user();
-               if ($cur->id != $user->id) {
-                       throw new OAuthException("Can't add for another user!");
-               }
-               $listenee = $req->get_parameter('omb_listenee');
-               if (!Validate::uri($listenee) &&
-                       !common_valid_tag($listenee)) {
-                       throw new OAuthException("Listenee URI '$listenee' not a recognizable URI");
-               }
-               if (strlen($listenee) > 255) {
-                       throw new OAuthException("Listenee URI '$listenee' too long");
-               }
-
-               $other = User::staticGet('uri', $listenee);
-               if ($other) {
-                       throw new OAuthException("Listenee URI '$listenee' is local user");
-               }
-
-               $remote = Remote_profile::staticGet('uri', $listenee);
-               if ($remote) {
-                       $sub = new Subscription();
-                       $sub->subscriber = $user->id;
-                       $sub->subscribed = $remote->id;
-                       if ($sub->find(TRUE)) {
-                               throw new OAuthException("Already subscribed to user!");
-                       }
-               }
-               $nickname = $req->get_parameter('omb_listenee_nickname');
-               if (!Validate::string($nickname, array('min_length' => 1,
-                                                                                          'max_length' => 64,
-                                                                                          'format' => VALIDATE_NUM . VALIDATE_ALPHA_LOWER))) {
-                       throw new OAuthException('Nickname must have only letters and numbers and no spaces.');
-               }
-               $profile = $req->get_parameter('omb_listenee_profile');
-               if (!common_valid_http_url($profile)) {
-                       throw new OAuthException("Invalid profile URL '$profile'.");
-               }
-
-               if ($profile == common_local_url('showstream', array('nickname' => $nickname))) {
-                       throw new OAuthException("Profile URL '$profile' is for a local user.");
-               }
-
-               $license = $req->get_parameter('omb_listenee_license');
-               if (!common_valid_http_url($license)) {
-                       throw new OAuthException("Invalid license URL '$license'.");
-               }
-               $site_license = common_config('license', 'url');
-               if (!common_compatible_license($license, $site_license)) {
-                       throw new OAuthException("Listenee stream license '$license' not compatible with site license '$site_license'.");
-               }
-               # optional stuff
-               $fullname = $req->get_parameter('omb_listenee_fullname');
-               if ($fullname && strlen($fullname) > 255) {
-                       throw new OAuthException("Full name '$fullname' too long.");
-               }
-               $homepage = $req->get_parameter('omb_listenee_homepage');
-               if ($homepage && (!common_valid_http_url($homepage) || strlen($homepage) > 255)) {
-                       throw new OAuthException("Invalid homepage '$homepage'");
-               }
-               $bio = $req->get_parameter('omb_listenee_bio');
-               if ($bio && strlen($bio) > 140) {
-                       throw new OAuthException("Bio too long '$bio'");
-               }
-               $location = $req->get_parameter('omb_listenee_location');
-               if ($location && strlen($location) > 255) {
-                       throw new OAuthException("Location too long '$location'");
-               }
-               $avatar = $req->get_parameter('omb_listenee_avatar');
-               if ($avatar) {
-                       if (!common_valid_http_url($avatar) || strlen($avatar) > 255) {
-                               throw new OAuthException("Invalid avatar URL '$avatar'");
-                       }
-                       $size = @getimagesize($avatar);
-                       if (!$size) {
-                               throw new OAuthException("Can't read avatar URL '$avatar'");
-                       }
-                       if ($size[0] != AVATAR_PROFILE_SIZE || $size[1] != AVATAR_PROFILE_SIZE) {
-                               throw new OAuthException("Wrong size image at '$avatar'");
-                       }
-                       if (!in_array($size[2], array(IMAGETYPE_GIF, IMAGETYPE_JPEG,
-                                                                                 IMAGETYPE_PNG))) {
-                               throw new OAuthException("Wrong image type for '$avatar'");
-                       }
-               }
-               $callback = $req->get_parameter('oauth_callback');
-               if ($callback && !common_valid_http_url($callback)) {
-                       throw new OAuthException("Invalid callback URL '$callback'");
-               }
-               if ($callback && $callback == common_local_url('finishremotesubscribe')) {
-                       throw new OAuthException("Callback URL '$callback' is for local site.");
-               }
-       }
-
-       # Snagged from OAuthServer
-
-       function check_version(&$req) {
-               $version = $req->get_parameter("oauth_version");
-               if (!$version) {
-                       $version = 1.0;
-               }
-               if ($version != 1.0) {
-                       throw new OAuthException("OAuth version '$version' not supported");
-               }
-               return $version;
-       }
-
-       # Snagged from OAuthServer
-
-       function get_consumer($datastore, $req) {
-               $consumer_key = @$req->get_parameter("oauth_consumer_key");
-               if (!$consumer_key) {
-                       throw new OAuthException("Invalid consumer key");
-               }
-
-               $consumer = $datastore->lookup_consumer($consumer_key);
-               if (!$consumer) {
-                       throw new OAuthException("Invalid consumer");
-               }
-               return $consumer;
-       }
-
-       # Mostly cadged from OAuthServer
-
-       function get_token($datastore, &$req, $consumer) {/*{{{*/
-               $token_field = @$req->get_parameter('oauth_token');
-               $token = $datastore->lookup_token($consumer, 'request', $token_field);
-               if (!$token) {
-                       throw new OAuthException("Invalid $token_type token: $token_field");
-               }
-               return $token;
-       }
-
-       function check_timestamp(&$req) {
-               $timestamp = @$req->get_parameter('oauth_timestamp');
-               $now = time();
-               if ($now - $timestamp > TIMESTAMP_THRESHOLD) {
-                       throw new OAuthException("Expired timestamp, yours $timestamp, ours $now");
-               }
-       }
-
-       # NOTE: don't call twice on the same request; will fail!
-       function check_nonce(&$datastore, &$req, $consumer, $token) {
-               $timestamp = @$req->get_parameter('oauth_timestamp');
-               $nonce = @$req->get_parameter('oauth_nonce');
-               $found = $datastore->lookup_nonce($consumer, $token, $nonce, $timestamp);
-               if ($found) {
-                       throw new OAuthException("Nonce already used");
-               }
-               return true;
-       }
-
-       function check_signature(&$req, $consumer, $token) {
-               $signature_method = $this->get_signature_method($req);
-               $signature = $req->get_parameter('oauth_signature');
-               $valid_sig = $signature_method->check_signature($req,
-                                                                                                               $consumer,
-                                                                                                               $token,
-                                                                                                               $signature);
-               if (!$valid_sig) {
-                       throw new OAuthException("Invalid signature");
-               }
-       }
-
-       function get_signature_method(&$req) {
-               $signature_method = @$req->get_parameter("oauth_signature_method");
-               if (!$signature_method) {
-                       $signature_method = "PLAINTEXT";
-               }
-               if ($signature_method != 'HMAC-SHA1') {
-                       throw new OAuthException("Signature method '$signature_method' not supported.");
-               }
-               return omb_hmac_sha1();
-       }
+class UserauthorizationAction extends Action
+{
+    var $error;
+    var $params;
+
+    function handle($args)
+    {
+        parent::handle($args);
+
+        if ($_SERVER['REQUEST_METHOD'] == 'POST') {
+            /* Use a session token for CSRF protection. */
+            $token = $this->trimmed('token');
+            if (!$token || $token != common_session_token()) {
+                $srv = $this->getStoredParams();
+                $this->showForm($srv->getRemoteUser(), _('There was a problem ' .
+                                        'with your session token. Try again, ' .
+                                        'please.'));
+                return;
+            }
+            /* We've shown the form, now post user's choice. */
+            $this->sendAuthorization();
+        } else {
+            if (!common_logged_in()) {
+                /* Go log in, and then come back. */
+                common_set_returnto($_SERVER['REQUEST_URI']);
+
+                if (!common_config('site', 'openidonly')) {
+                    common_redirect(common_local_url('login'));
+                } else {
+                    common_redirect(common_local_url('openidlogin'));
+                }
+                return;
+            }
+
+            $user    = common_current_user();
+            $profile = $user->getProfile();
+            if (!$profile) {
+                common_log_db_error($user, 'SELECT', __FILE__);
+                $this->serverError(_('User without matching profile'));
+                return;
+            }
+
+            /* TODO: If no token is passed the user should get a prompt to enter
+               it according to OAuth Core 1.0. */
+            try {
+                $this->validateOmb();
+                $srv = new OMB_Service_Provider(
+                        profile_to_omb_profile($user->uri, $profile),
+                        omb_oauth_datastore());
+
+                $remote_user = $srv->handleUserAuth();
+            } catch (Exception $e) {
+                $this->clearParams();
+                $this->clientError($e->getMessage());
+                return;
+            }
+
+            $this->storeParams($srv);
+            $this->showForm($remote_user);
+        }
+    }
+
+    function showForm($params, $error=null)
+    {
+        $this->params = $params;
+        $this->error  = $error;
+        $this->showPage();
+    }
+
+    function title()
+    {
+        return _('Authorize subscription');
+    }
+
+    function showPageNotice()
+    {
+        $this->element('p', null, _('Please check these details to make sure '.
+                                    'that you want to subscribe to this ' .
+                                    'user’s notices. If you didn’t just ask ' .
+                                    'to subscribe to someone’s notices, '.
+                                    'click “Reject”.'));
+    }
+
+    function showContent()
+    {
+        $params = $this->params;
+
+        $nickname = $params->getNickname();
+        $profile  = $params->getProfileURL();
+        $license  = $params->getLicenseURL();
+        $fullname = $params->getFullname();
+        $homepage = $params->getHomepage();
+        $bio      = $params->getBio();
+        $location = $params->getLocation();
+        $avatar   = $params->getAvatarURL();
+
+        $this->elementStart('div', array('class' => 'profile'));
+        $this->elementStart('div', 'entity_profile vcard');
+        $this->elementStart('a', array('href' => $profile,
+                                            'class' => 'url'));
+        if ($avatar) {
+            $this->element('img', array('src' => $avatar,
+                                        'class' => 'photo avatar',
+                                        'width' => AVATAR_PROFILE_SIZE,
+                                        'height' => AVATAR_PROFILE_SIZE,
+                                        'alt' => $nickname));
+        }
+        $hasFN = ($fullname !== '') ? 'nickname' : 'fn nickname';
+        $this->elementStart('span', $hasFN);
+        $this->raw($nickname);
+        $this->elementEnd('span');
+        $this->elementEnd('a');
+
+        if (!is_null($fullname)) {
+            $this->elementStart('dl', 'entity_fn');
+            $this->elementStart('dd');
+            $this->elementStart('span', 'fn');
+            $this->raw($fullname);
+            $this->elementEnd('span');
+            $this->elementEnd('dd');
+            $this->elementEnd('dl');
+        }
+        if (!is_null($location)) {
+            $this->elementStart('dl', 'entity_location');
+            $this->element('dt', null, _('Location'));
+            $this->elementStart('dd', 'label');
+            $this->raw($location);
+            $this->elementEnd('dd');
+            $this->elementEnd('dl');
+        }
+
+        if (!is_null($homepage)) {
+            $this->elementStart('dl', 'entity_url');
+            $this->element('dt', null, _('URL'));
+            $this->elementStart('dd');
+            $this->elementStart('a', array('href' => $homepage,
+                                                'class' => 'url'));
+            $this->raw($homepage);
+            $this->elementEnd('a');
+            $this->elementEnd('dd');
+            $this->elementEnd('dl');
+        }
+
+        if (!is_null($bio)) {
+            $this->elementStart('dl', 'entity_note');
+            $this->element('dt', null, _('Note'));
+            $this->elementStart('dd', 'note');
+            $this->raw($bio);
+            $this->elementEnd('dd');
+            $this->elementEnd('dl');
+        }
+
+        if (!is_null($license)) {
+            $this->elementStart('dl', 'entity_license');
+            $this->element('dt', null, _('License'));
+            $this->elementStart('dd', 'license');
+            $this->element('a', array('href' => $license,
+                                      'class' => 'license'),
+                           $license);
+            $this->elementEnd('dd');
+            $this->elementEnd('dl');
+        }
+        $this->elementEnd('div');
+
+        $this->elementStart('div', 'entity_actions');
+        $this->elementStart('ul');
+        $this->elementStart('li', 'entity_subscribe');
+        $this->elementStart('form', array('method' => 'post',
+                                          'id' => 'userauthorization',
+                                          'class' => 'form_user_authorization',
+                                          'name' => 'userauthorization',
+                                          'action' => common_local_url(
+                                                         'userauthorization')));
+        $this->hidden('token', common_session_token());
+
+        $this->submit('accept', _('Accept'), 'submit accept', null,
+                      _('Subscribe to this user'));
+        $this->submit('reject', _('Reject'), 'submit reject', null,
+                      _('Reject this subscription'));
+        $this->elementEnd('form');
+        $this->elementEnd('li');
+        $this->elementEnd('ul');
+        $this->elementEnd('div');
+        $this->elementEnd('div');
+    }
+
+    function sendAuthorization()
+    {
+        $srv = $this->getStoredParams();
+
+        if (is_null($srv)) {
+            $this->clientError(_('No authorization request!'));
+            return;
+        }
+
+        $accepted = $this->arg('accept');
+        try {
+            list($val, $token) = $srv->continueUserAuth($accepted);
+        } catch (Exception $e) {
+            $this->clientError($e->getMessage());
+            return;
+        }
+        if ($val !== false) {
+            common_redirect($val, 303);
+        } elseif ($accepted) {
+            $this->showAcceptMessage($token);
+        } else {
+            $this->showRejectMessage();
+        }
+    }
+
+    function showAcceptMessage($tok)
+    {
+        common_show_header(_('Subscription authorized'));
+        $this->element('p', null,
+                       _('The subscription has been authorized, but no '.
+                         'callback URL was passed. Check with the site’s ' .
+                         'instructions for details on how to authorize the ' .
+                         'subscription. Your subscription token is:'));
+        $this->element('blockquote', 'token', $tok);
+        common_show_footer();
+    }
+
+    function showRejectMessage()
+    {
+        common_show_header(_('Subscription rejected'));
+        $this->element('p', null,
+                       _('The subscription has been rejected, but no '.
+                         'callback URL was passed. Check with the site’s ' .
+                         'instructions for details on how to fully reject ' .
+                         'the subscription.'));
+        common_show_footer();
+    }
+
+    function storeParams($params)
+    {
+        common_ensure_session();
+        $_SESSION['userauthorizationparams'] = serialize($params);
+    }
+
+    function clearParams()
+    {
+        common_ensure_session();
+        unset($_SESSION['userauthorizationparams']);
+    }
+
+    function getStoredParams()
+    {
+        common_ensure_session();
+        $params = unserialize($_SESSION['userauthorizationparams']);
+        return $params;
+    }
+
+    function validateOmb()
+    {
+        $listener = $_GET['omb_listener'];
+        $listenee = $_GET['omb_listenee'];
+        $nickname = $_GET['omb_listenee_nickname'];
+        $profile  = $_GET['omb_listenee_profile'];
+
+        $user = User::staticGet('uri', $listener);
+        if (!$user) {
+            throw new Exception(sprintf(_('Listener URI ‘%s’ not found here'),
+                                        $listener));
+        }
+
+        if (strlen($listenee) > 255) {
+            throw new Exception(sprintf(_('Listenee URI ‘%s’ is too long.'),
+                                        $listenee));
+        }
+
+        $other = User::staticGet('uri', $listenee);
+        if ($other) {
+            throw new Exception(sprintf(_('Listenee URI ‘%s’ is a local user.'),
+                                        $listenee));
+        }
+
+        $remote = Remote_profile::staticGet('uri', $listenee);
+        if ($remote) {
+            $sub             = new Subscription();
+            $sub->subscriber = $user->id;
+            $sub->subscribed = $remote->id;
+            if ($sub->find(true)) {
+                throw new Exception('You are already subscribed to this user.');
+            }
+        }
+
+        if ($profile == common_profile_url($nickname)) {
+            throw new Exception(sprintf(_('Profile URL ‘%s’ is for a local user.'),
+                                        $profile));
+
+        }
+
+        $license      = $_GET['omb_listenee_license'];
+        $site_license = common_config('license', 'url');
+        if (!common_compatible_license($license, $site_license)) {
+            throw new Exception(sprintf(_('Listenee stream license ‘%s’ is not ' .
+                                          'compatible with site license ‘%s’.'),
+                                        $license, $site_license));
+        }
+
+        $avatar = $_GET['omb_listenee_avatar'];
+        if ($avatar) {
+            if (!common_valid_http_url($avatar) || strlen($avatar) > 255) {
+                throw new Exception(sprintf(_('Avatar URL ‘%s’ is not valid.'),
+                                            $avatar));
+            }
+            $size = @getimagesize($avatar);
+            if (!$size) {
+                throw new Exception(sprintf(_('Can’t read avatar URL ‘%s’.'),
+                                            $avatar));
+            }
+            if (!in_array($size[2], array(IMAGETYPE_GIF, IMAGETYPE_JPEG,
+                                          IMAGETYPE_PNG))) {
+                throw new Exception(sprintf(_('Wrong image type for avatar URL '.
+                                              '‘%s’.'), $avatar));
+            }
+        }
+    }
 }