diff options
Diffstat (limited to 'actions/remotesubscribe.php')
-rw-r--r-- | actions/remotesubscribe.php | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/actions/remotesubscribe.php b/actions/remotesubscribe.php new file mode 100644 index 000000000..c3a09bcfc --- /dev/null +++ b/actions/remotesubscribe.php @@ -0,0 +1,386 @@ +<?php +/* + * Laconica - a distributed open-source microblogging tool + * Copyright (C) 2008, Controlez-Vous, 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'); + +class RemotesubscribeAction extends Action { + + function handle($args) { + + parent::handle($args); + + if (common_logged_in()) { + common_user_error(_('You can use the local subscription!')); + return; + } + + if ($_SERVER['REQUEST_METHOD'] == 'POST') { + + # CSRF protection + $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; + } + + $this->remote_subscription(); + } else { + $this->show_form(); + } + } + + function get_instructions() { + return _('To subscribe, you can [login](%%action.login%%),' . + ' or [register](%%action.register%%) a new ' . + ' account. If you already have an account ' . + ' on a [compatible microblogging site](%%doc.openmublog%%), ' . + ' enter your profile URL below.'); + } + + function show_top($err=NULL) { + if ($err) { + common_element('div', 'error', $err); + } else { + $instructions = $this->get_instructions(); + $output = common_markup_to_html($instructions); + common_element_start('div', 'instructions'); + common_raw($output); + common_element_end('p'); + } + } + + function show_form($err=NULL) { + $nickname = $this->trimmed('nickname'); + $profile = $this->trimmed('profile_url'); + common_show_header(_('Remote subscribe'), NULL, $err, + array($this, 'show_top')); + # id = remotesubscribe conflicts with the + # button on profile page + common_element_start('form', array('id' => 'remsub', 'method' => 'post', + 'action' => common_local_url('remotesubscribe'))); + common_hidden('token', common_session_token()); + common_input('nickname', _('User nickname'), $nickname, + _('Nickname of the user you want to follow')); + common_input('profile_url', _('Profile URL'), $profile, + _('URL of your profile on another compatible microblogging service')); + common_submit('submit', _('Subscribe')); + common_element_end('form'); + common_show_footer(); + } + + function remote_subscription() { + $user = $this->get_user(); + + if (!$user) { + $this->show_form(_('No such user.')); + return; + } + + $profile = $this->trimmed('profile_url'); + + if (!$profile) { + $this->show_form(_('No such user.')); + return; + } + + if (!Validate::uri($profile, array('allowed_schemes' => array('http', 'https')))) { + $this->show_form(_('Invalid profile URL (bad format)')); + return; + } + + $fetcher = Auth_Yadis_Yadis::getHTTPFetcher(); + $yadis = Auth_Yadis_Yadis::discover($profile, $fetcher); + + if (!$yadis || $yadis->failed) { + $this->show_form(_('Not a valid profile URL (no YADIS document).')); + return; + } + + # XXX: a little liberal for sites that accidentally put whitespace before the xml declaration + + $xrds =& Auth_Yadis_XRDS::parseXRDS(trim($yadis->response_text)); + + if (!$xrds) { + $this->show_form(_('Not a valid profile URL (no XRDS defined).')); + return; + } + + $omb = $this->getOmb($xrds); + + if (!$omb) { + $this->show_form(_('Not a valid profile URL (incorrect services).')); + return; + } + + if (omb_service_uri($omb[OAUTH_ENDPOINT_REQUEST]) == + common_local_url('requesttoken')) + { + $this->show_form(_('That\'s a local profile! Login to subscribe.')); + return; + } + + if (User::staticGet('uri', omb_local_id($omb[OAUTH_ENDPOINT_REQUEST]))) { + $this->show_form(_('That\'s a local profile! Login to subscribe.')); + return; + } + + list($token, $secret) = $this->request_token($omb); + + if (!$token || !$secret) { + $this->show_form(_('Couldn\'t get a request token.')); + return; + } + + $this->request_authorization($user, $omb, $token, $secret); + } + + function get_user() { + $user = NULL; + $nickname = $this->trimmed('nickname'); + if ($nickname) { + $user = User::staticGet('nickname', $nickname); + } + return $user; + } + + function getOmb($xrds) { + + static $omb_endpoints = array(OMB_ENDPOINT_UPDATEPROFILE, OMB_ENDPOINT_POSTNOTICE); + static $oauth_endpoints = array(OAUTH_ENDPOINT_REQUEST, OAUTH_ENDPOINT_AUTHORIZE, + OAUTH_ENDPOINT_ACCESS); + $omb = array(); + + # XXX: the following code could probably be refactored to eliminate dupes + + $oauth_services = omb_get_services($xrds, OAUTH_DISCOVERY); + + if (!$oauth_services) { + return NULL; + } + + $oauth_service = $oauth_services[0]; + + $oauth_xrd = $this->getXRD($oauth_service, $xrds); + + if (!$oauth_xrd) { + return NULL; + } + + if (!$this->addServices($oauth_xrd, $oauth_endpoints, $omb)) { + return NULL; + } + + $omb_services = omb_get_services($xrds, OMB_NAMESPACE); + + if (!$omb_services) { + return NULL; + } + + $omb_service = $omb_services[0]; + + $omb_xrd = $this->getXRD($omb_service, $xrds); + + if (!$omb_xrd) { + return NULL; + } + + if (!$this->addServices($omb_xrd, $omb_endpoints, $omb)) { + return NULL; + } + + # XXX: check that we got all the services we needed + + foreach (array_merge($omb_endpoints, $oauth_endpoints) as $type) { + if (!array_key_exists($type, $omb) || !$omb[$type]) { + return NULL; + } + } + + if (!omb_local_id($omb[OAUTH_ENDPOINT_REQUEST])) { + return NULL; + } + + return $omb; + } + + function getXRD($main_service, $main_xrds) { + $uri = omb_service_uri($main_service); + if (strpos($uri, "#") !== 0) { + # FIXME: more rigorous handling of external service definitions + return NULL; + } + $id = substr($uri, 1); + $nodes = $main_xrds->allXrdNodes; + $parser = $main_xrds->parser; + foreach ($nodes as $node) { + $attrs = $parser->attributes($node); + if (array_key_exists('xml:id', $attrs) && + $attrs['xml:id'] == $id) { + # XXX: trick the constructor into thinking this is the only node + $bogus_nodes = array($node); + return new Auth_Yadis_XRDS($parser, $bogus_nodes); + } + } + return NULL; + } + + function addServices($xrd, $types, &$omb) { + foreach ($types as $type) { + $matches = omb_get_services($xrd, $type); + if ($matches) { + $omb[$type] = $matches[0]; + } else { + # no match for type + return false; + } + } + return true; + } + + function request_token($omb) { + $con = omb_oauth_consumer(); + + $url = omb_service_uri($omb[OAUTH_ENDPOINT_REQUEST]); + + # XXX: Is this the right thing to do? Strip off GET params and make them + # POST params? Seems wrong to me. + + $parsed = parse_url($url); + $params = array(); + parse_str($parsed['query'], $params); + + $req = OAuthRequest::from_consumer_and_token($con, NULL, "POST", $url, $params); + + $listener = omb_local_id($omb[OAUTH_ENDPOINT_REQUEST]); + + if (!$listener) { + return NULL; + } + + $req->set_parameter('omb_listener', $listener); + $req->set_parameter('omb_version', OMB_VERSION_01); + + # XXX: test to see if endpoint accepts this signature method + + $req->sign_request(omb_hmac_sha1(), $con, NULL); + + # We re-use this tool's fetcher, since it's pretty good + + $fetcher = Auth_Yadis_Yadis::getHTTPFetcher(); + + $result = $fetcher->post($req->get_normalized_http_url(), + $req->to_postdata(), + array('User-Agent' => 'Laconica/' . LACONICA_VERSION)); + + if ($result->status != 200) { + return NULL; + } + + parse_str($result->body, $return); + + return array($return['oauth_token'], $return['oauth_token_secret']); + } + + function request_authorization($user, $omb, $token, $secret) { + global $config; # for license URL + + $con = omb_oauth_consumer(); + $tok = new OAuthToken($token, $secret); + + $url = omb_service_uri($omb[OAUTH_ENDPOINT_AUTHORIZE]); + + # XXX: Is this the right thing to do? Strip off GET params and make them + # POST params? Seems wrong to me. + + $parsed = parse_url($url); + $params = array(); + parse_str($parsed['query'], $params); + + $req = OAuthRequest::from_consumer_and_token($con, $tok, 'GET', $url, $params); + + # We send over a ton of information. This lets the other + # server store info about our user, and it lets the current + # user decide if they really want to authorize the subscription. + + $req->set_parameter('omb_version', OMB_VERSION_01); + $req->set_parameter('omb_listener', omb_local_id($omb[OAUTH_ENDPOINT_REQUEST])); + $req->set_parameter('omb_listenee', $user->uri); + $req->set_parameter('omb_listenee_profile', common_profile_url($user->nickname)); + $req->set_parameter('omb_listenee_nickname', $user->nickname); + $req->set_parameter('omb_listenee_license', $config['license']['url']); + + $profile = $user->getProfile(); + if (!$profile) { + common_log_db_error($user, 'SELECT', __FILE__); + $this->server_error(_('User without matching profile')); + return; + } + + if ($profile->fullname) { + $req->set_parameter('omb_listenee_fullname', $profile->fullname); + } + if ($profile->homepage) { + $req->set_parameter('omb_listenee_homepage', $profile->homepage); + } + if ($profile->bio) { + $req->set_parameter('omb_listenee_bio', $profile->bio); + } + if ($profile->location) { + $req->set_parameter('omb_listenee_location', $profile->location); + } + $avatar = $profile->getAvatar(AVATAR_PROFILE_SIZE); + if ($avatar) { + $req->set_parameter('omb_listenee_avatar', $avatar->url); + } + + # XXX: add a nonce to prevent replay attacks + + $req->set_parameter('oauth_callback', common_local_url('finishremotesubscribe')); + + # XXX: test to see if endpoint accepts this signature method + + $req->sign_request(omb_hmac_sha1(), $con, $tok); + + # store all our info here + + $omb['listenee'] = $user->nickname; + $omb['listener'] = omb_local_id($omb[OAUTH_ENDPOINT_REQUEST]); + $omb['token'] = $token; + $omb['secret'] = $secret; + # call doesn't work after bounce back so we cache; maybe serialization issue...? + $omb['access_token_url'] = omb_service_uri($omb[OAUTH_ENDPOINT_ACCESS]); + $omb['post_notice_url'] = omb_service_uri($omb[OMB_ENDPOINT_POSTNOTICE]); + $omb['update_profile_url'] = omb_service_uri($omb[OMB_ENDPOINT_UPDATEPROFILE]); + + common_ensure_session(); + + $_SESSION['oauth_authorization_request'] = $omb; + + # Redirect to authorization service + + common_redirect($req->to_url()); + return; + } + + function make_nonce() { + return common_good_rand(16); + } +} |