gnu-social/actions/remotesubscribe.php

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<?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(_t('You can use the local subscription!'));
return;
}
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
$this->remote_subscription();
} else {
$this->show_form();
}
}
function get_instructions() {
return _t('To subscribe, you can [login](%%action.login%%),' .
' or [register](%%action.register%%) a new ' .
' account. If you already have an account ' .
' on a [compatible microblogging site](%%doc.openmublog%%), ' .
' enter your profile URL below.');
}
function show_top($err=NULL) {
if ($err) {
common_element('div', 'error', $err);
} else {
$instructions = $this->get_instructions();
$output = common_markup_to_html($instructions);
common_element_start('p', '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(_t('Remote subscribe'), NULL, $err,
array($this, 'show_top'));
common_element_start('form', array('id' => 'remotesubscribe', 'method' => 'post',
'action' => common_local_url('remotesubscribe')));
common_input('nickname', _t('User nickname'), $nickname,
_t('Nickname of the user you want to follow'));
common_input('profile_url', _t('Profile URL'), $profile,
_t('URL of your profile on another compatible microblogging service'));
common_submit('submit', _t('Subscribe'));
common_element_end('form');
common_show_footer();
}
function remote_subscription() {
$user = $this->get_user();
if (!$user) {
$this->show_form(_t('No such user!'));
return;
}
$profile = $this->trimmed('profile_url');
if (!$profile) {
$this->show_form(_t('No such user!'));
return;
}
if (!Validate::uri($profile, array('allowed_schemes' => array('http', 'https')))) {
$this->show_form(_t('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(_t('Not a valid profile URL (no YADIS document).'));
return;
}
$xrds =& Auth_Yadis_XRDS::parseXRDS($yadis->response_text);
if (!$xrds) {
$this->show_form(_t('Not a valid profile URL (no XRDS defined).'));
return;
}
$omb = $this->getOmb($xrds);
if (!$omb) {
$this->show_form(_t('Not a valid profile URL (incorrect services).'));
return;
}
list($token, $secret) = $this->request_token($omb);
if (!$token || !$secret) {
$this->show_form(_t('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(),
$req->to_postdata());
if ($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->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]);
$_SESSION['oauth_authorization_request'] = $omb;
# Redirect to authorization service
common_redirect($req->to_url());
return;
}
function make_nonce() {
return common_good_rand(16);
}
}