352 lines
9.6 KiB
PHP
352 lines
9.6 KiB
PHP
<?php
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/*
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* Laconica - a distributed open-source microblogging tool
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* Copyright (C) 2008, Controlez-Vous, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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if (!defined('LACONICA')) { exit(1); }
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require_once(INSTALLDIR.'/lib/omb.php');
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class RemotesubscribeAction extends Action {
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function handle($args) {
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parent::handle($args);
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if (common_logged_in()) {
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common_user_error(_t('You can use the local subscription!'));
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return;
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}
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if ($_SERVER['REQUEST_METHOD'] == 'POST') {
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$this->remote_subscription();
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} else {
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$this->show_form();
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}
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}
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function get_instructions() {
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return _t('To subscribe, you can [login](%%action.login%%),' .
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' or [register](%%action.register%%) a new ' .
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' account. If you already have an account ' .
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' on a [compatible microblogging site](%%doc.openmublog%%), ' .
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' enter your profile URL below.');
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}
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function show_top($err=NULL) {
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if ($err) {
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common_element('div', 'error', $err);
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} else {
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$instructions = $this->get_instructions();
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$output = common_markup_to_html($instructions);
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common_element_start('p', 'instructions');
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common_raw($output);
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common_element_end('p');
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}
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}
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function show_form($err=NULL) {
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$nickname = $this->trimmed('nickname');
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$profile = $this->trimmed('profile_url');
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common_show_header(_t('Remote subscribe'), NULL, $err,
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array($this, 'show_top'));
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common_element_start('form', array('id' => 'remotesubscribe', 'method' => 'POST',
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'action' => common_local_url('remotesubscribe')));
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common_input('nickname', _t('User nickname'), $nickname,
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_t('Nickname of the user you want to follow'));
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common_input('profile_url', _t('Profile URL'), $profile,
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_t('URL of your profile on another compatible microblogging service'));
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common_submit('submit', _t('Subscribe'));
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common_element_end('form');
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common_show_footer();
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}
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function remote_subscription() {
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$user = $this->get_user();
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if (!$user) {
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$this->show_form(_t('No such user!'));
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return;
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}
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$profile = $this->trimmed('profile_url');
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if (!$profile) {
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$this->show_form(_t('No such user!'));
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return;
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}
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if (!Validate::uri($profile, array('allowed_schemes' => array('http', 'https')))) {
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$this->show_form(_t('Invalid profile URL (bad format)'));
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return;
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}
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$fetcher = Auth_Yadis_Yadis::getHTTPFetcher();
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$yadis = Auth_Yadis_Yadis::discover($profile, $fetcher);
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if (!$yadis || $yadis->failed) {
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$this->show_form(_t('Not a valid profile URL (no YADIS document).'));
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return;
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}
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$xrds =& Auth_Yadis_XRDS::parseXRDS($yadis->response_text);
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if (!$xrds) {
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$this->show_form(_t('Not a valid profile URL (no XRDS defined).'));
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return;
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}
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$omb = $this->getOmb($xrds);
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if (!$omb) {
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$this->show_form(_t('Not a valid profile URL (incorrect services).'));
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return;
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}
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list($token, $secret) = $this->request_token($omb);
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if (!$token || !$secret) {
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$this->show_form(_t('Couldn\'t get a request token.'));
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return;
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}
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$this->request_authorization($user, $omb, $token, $secret);
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}
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function get_user() {
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$user = NULL;
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$nickname = $this->trimmed('nickname');
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if ($nickname) {
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$user = User::staticGet('nickname', $nickname);
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}
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return $user;
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}
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function getOmb($xrds) {
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static $omb_endpoints = array(OMB_ENDPOINT_UPDATEPROFILE, OMB_ENDPOINT_POSTNOTICE);
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static $oauth_endpoints = array(OAUTH_ENDPOINT_REQUEST, OAUTH_ENDPOINT_AUTHORIZE,
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OAUTH_ENDPOINT_ACCESS);
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$omb = array();
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# XXX: the following code could probably be refactored to eliminate dupes
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$oauth_services = omb_get_services($xrds, OAUTH_DISCOVERY);
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if (!$oauth_services) {
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return NULL;
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}
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$oauth_service = $oauth_services[0];
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$oauth_xrd = $this->getXRD($oauth_service, $xrds);
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if (!$oauth_xrd) {
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return NULL;
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}
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if (!$this->addServices($oauth_xrd, $oauth_endpoints, $omb)) {
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return NULL;
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}
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$omb_services = omb_get_services($xrds, OMB_NAMESPACE);
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if (!$omb_services) {
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return NULL;
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}
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$omb_service = $omb_services[0];
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$omb_xrd = $this->getXRD($omb_service, $xrds);
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if (!$omb_xrd) {
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return NULL;
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}
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if (!$this->addServices($omb_xrd, $omb_endpoints, $omb)) {
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return NULL;
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}
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# XXX: check that we got all the services we needed
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foreach (array_merge($omb_endpoints, $oauth_endpoints) as $type) {
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if (!array_key_exists($type, $omb) || !$omb[$type]) {
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return NULL;
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}
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}
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if (!omb_local_id($omb[OAUTH_ENDPOINT_REQUEST])) {
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return NULL;
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}
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return $omb;
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}
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function getXRD($main_service, $main_xrds) {
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$uri = omb_service_uri($main_service);
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if (strpos($uri, "#") !== 0) {
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# FIXME: more rigorous handling of external service definitions
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return NULL;
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}
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$id = substr($uri, 1);
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$nodes = $main_xrds->allXrdNodes;
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$parser = $main_xrds->parser;
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foreach ($nodes as $node) {
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$attrs = $parser->attributes($node);
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if (array_key_exists('xml:id', $attrs) &&
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$attrs['xml:id'] == $id) {
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# XXX: trick the constructor into thinking this is the only node
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$bogus_nodes = array($node);
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return new Auth_Yadis_XRDS($parser, $bogus_nodes);
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}
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}
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return NULL;
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}
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function addServices($xrd, $types, &$omb) {
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foreach ($types as $type) {
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$matches = omb_get_services($xrd, $type);
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if ($matches) {
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$omb[$type] = $matches[0];
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} else {
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# no match for type
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return false;
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}
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}
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return true;
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}
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function request_token($omb) {
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$con = omb_oauth_consumer();
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$url = omb_service_uri($omb[OAUTH_ENDPOINT_REQUEST]);
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# XXX: Is this the right thing to do? Strip off GET params and make them
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# POST params? Seems wrong to me.
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$parsed = parse_url($url);
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$params = array();
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parse_str($parsed['query'], $params);
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$req = OAuthRequest::from_consumer_and_token($con, NULL, "POST", $url, $params);
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$listener = omb_local_id($omb[OAUTH_ENDPOINT_REQUEST]);
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if (!$listener) {
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return NULL;
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}
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$req->set_parameter('omb_listener', $listener);
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$req->set_parameter('omb_version', OMB_VERSION_01);
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# XXX: test to see if endpoint accepts this signature method
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$req->sign_request(omb_hmac_sha1(), $con, NULL);
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# We re-use this tool's fetcher, since it's pretty good
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$fetcher = Auth_Yadis_Yadis::getHTTPFetcher();
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$result = $fetcher->post($req->get_normalized_http_url(),
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$req->to_postdata());
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if ($result->status != 200) {
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return NULL;
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}
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parse_str($result->body, $return);
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return array($return['oauth_token'], $return['oauth_token_secret']);
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}
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function request_authorization($user, $omb, $token, $secret) {
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global $config; # for license URL
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$con = omb_oauth_consumer();
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$tok = new OAuthToken($token, $secret);
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$url = omb_service_uri($omb[OAUTH_ENDPOINT_AUTHORIZE]);
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# XXX: Is this the right thing to do? Strip off GET params and make them
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# POST params? Seems wrong to me.
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$parsed = parse_url($url);
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$params = array();
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parse_str($parsed['query'], $params);
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$req = OAuthRequest::from_consumer_and_token($con, $tok, 'GET', $url, $params);
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# We send over a ton of information. This lets the other
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# server store info about our user, and it lets the current
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# user decide if they really want to authorize the subscription.
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$req->set_parameter('omb_version', OMB_VERSION_01);
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$req->set_parameter('omb_listener', omb_local_id($omb[OAUTH_ENDPOINT_REQUEST]));
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$req->set_parameter('omb_listenee', $user->uri);
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$req->set_parameter('omb_listenee_profile', common_profile_url($user->nickname));
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$req->set_parameter('omb_listenee_nickname', $user->nickname);
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$req->set_parameter('omb_listenee_license', $config['license']['url']);
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$profile = $user->getProfile();
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if ($profile->fullname) {
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$req->set_parameter('omb_listenee_fullname', $profile->fullname);
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}
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if ($profile->homepage) {
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$req->set_parameter('omb_listenee_homepage', $profile->homepage);
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}
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if ($profile->bio) {
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$req->set_parameter('omb_listenee_bio', $profile->bio);
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}
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if ($profile->location) {
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$req->set_parameter('omb_listenee_location', $profile->location);
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}
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$avatar = $profile->getAvatar(AVATAR_PROFILE_SIZE);
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if ($avatar) {
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$req->set_parameter('omb_listenee_avatar', $avatar->url);
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}
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# XXX: add a nonce to prevent replay attacks
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$req->set_parameter('oauth_callback', common_local_url('finishremotesubscribe'));
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# XXX: test to see if endpoint accepts this signature method
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$req->sign_request(omb_hmac_sha1(), $con, $tok);
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# store all our info here
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$omb['listenee'] = $user->nickname;
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$omb['listener'] = omb_local_id($omb[OAUTH_ENDPOINT_REQUEST]);
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$omb['token'] = $token;
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$omb['secret'] = $secret;
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# call doesn't work after bounce back so we cache; maybe serialization issue...?
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$omb['access_token_url'] = omb_service_uri($omb[OAUTH_ENDPOINT_ACCESS]);
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$omb['post_notice_url'] = omb_service_uri($omb[OMB_ENDPOINT_POSTNOTICE]);
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$omb['update_profile_url'] = omb_service_uri($omb[OMB_ENDPOINT_UPDATEPROFILE]);
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$_SESSION['oauth_authorization_request'] = $omb;
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# Redirect to authorization service
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common_redirect($req->to_url());
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return;
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}
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function make_nonce() {
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return common_good_rand(16);
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}
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}
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