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');
require_once('Auth/Yadis/Yadis.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 {
$this->show_form();
}
}
function show_form($err=NULL) {
common_show_header(_t('Remote subscribe'));
if ($err) {
common_element('div', 'error', $err);
}
common_element_start('form', array('id' => 'remotesubscribe', 'method' => 'POST',
'action' => common_local_url('remotesubscribe')));
common_input('profile', _t('Profile URL'));
common_submit('submit', _t('Subscribe'));
common_element_end('form');
}
function remote_subscription() {
$user = $this->get_user();
if (!$user) {
$this->show_form(_t('No such user!'));
return;
}
$profile = $this->trimmed('profile');
if (!$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) {
$this->show_form(_t('Not a valid profile URL (no YADIS document).'));
return;
}
$omb = $this->getOmb($yadis);
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 $user;
}
function getOmb($yadis) {
static $endpoints = array(OMB_ENDPOINT_UPDATEPROFILE, OMB_ENDPOINT_POSTNOTICE,
OAUTH_ENDPOINT_REQUEST, OAUTH_ENDPOINT_AUTHORIZE,
OAUTH_ENDPOINT_ACCESS);
$omb = array();
$services = $yadis->services(); # ordered by priority
foreach ($services as $service) {
$types = $service->matchTypes($endpoints);
foreach ($types as $type) {
# We take the first one, since it's the highest priority
if (!array_key_exists($type, $omb)) {
# URIs is an array, priority-ordered
$omb[$type] = $service->getURIs();
# Special handling for request
if ($type == OAUTH_ENDPOINT_REQUEST) {
$nodes = $service->getElements('LocalID');
if (!$nodes) {
# error
return NULL;
}
$omb['listener'] = $service->parser->content($nodes[0]);
}
}
}
}
foreach ($endpoints as $ep) {
if (!array_key_exists($ep, $omb)) {
return NULL;
}
}
if (!array_key_exists('listener', $omb)) {
return NULL;
}
return $omb;
}
function request_token($omb) {
$con = omb_oauth_consumer();
$url = $omb[OAUTH_ENDPOINT_REQUEST][0];
# 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);
$req->set_parameter('omb_listener', $omb['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[OAUTH_ENDPOINT_AUTHORIZE][0];
# 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['listener']);
$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);
}
$nonce = $this->make_nonce();
$req->set_parameter('oauth_callback', common_local_url('finishremotesubscribe',
array('nonce' => $nonce)));
# 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['token'] = $token;
$omb['secret'] = $secret;
$_SESSION[$nonce] = $omb;
# Redirect to authorization service
common_redirect($req->to_url());
return;
}
}