gnu-social/extlib/libomb/service_provider.php

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2009-08-10 13:48:50 +01:00
<?php
require_once 'constants.php';
require_once 'remoteserviceexception.php';
require_once 'helper.php';
/**
* OMB service realization
*
* This class realizes a complete, simple OMB service.
*
* PHP version 5
*
* LICENSE: 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/>.
*
* @package OMB
* @author Adrian Lang <mail@adrianlang.de>
* @copyright 2009 Adrian Lang
* @license http://www.gnu.org/licenses/agpl.html GNU AGPL 3.0
**/
class OMB_Service_Provider {
protected $user; /* An OMB_Profile representing the user */
protected $datastore; /* AN OMB_Datastore */
protected $remote_user; /* An OMB_Profile representing the remote user during
the authorization process */
protected $oauth_server; /* An OAuthServer; should only be accessed via
getOAuthServer. */
/**
* Initialize an OMB_Service_Provider object
*
* Constructs an OMB_Service_Provider instance that provides OMB services
* referring to a particular user.
*
* @param OMB_Profile $user An OMB_Profile; mandatory for XRDS
* output, user auth handling and OMB
* action performing
* @param OMB_Datastore $datastore An OMB_Datastore; mandatory for
* everything but XRDS output
* @param OAuthServer $oauth_server An OAuthServer; used for token writing
* and OMB action handling; will use
* default value if not set
*
* @access public
**/
public function __construct ($user = null, $datastore = null, $oauth_server = null) {
$this->user = $user;
$this->datastore = $datastore;
$this->oauth_server = $oauth_server;
}
public function getRemoteUser() {
return $this->remote_user;
}
/**
* Write a XRDS document
*
* Writes a XRDS document specifying the OMB service. Optionally uses a
* given object of a class implementing OMB_XRDS_Writer for output. Else
* OMB_Plain_XRDS_Writer is used.
*
* @param OMB_XRDS_Mapper $xrds_mapper An object mapping actions to URLs
* @param OMB_XRDS_Writer $xrds_writer Optional; The OMB_XRDS_Writer used to
* write the XRDS document
*
* @access public
*
* @return mixed Depends on the used OMB_XRDS_Writer; OMB_Plain_XRDS_Writer
* returns nothing.
**/
public function writeXRDS($xrds_mapper, $xrds_writer = null) {
if ($xrds_writer == null) {
require_once 'plain_xrds_writer.php';
$xrds_writer = new OMB_Plain_XRDS_Writer();
}
return $xrds_writer->writeXRDS($this->user, $xrds_mapper);
}
/**
* Echo a request token
*
* Outputs an unauthorized request token for the query found in $_GET or
* $_POST.
*
* @access public
**/
public function writeRequestToken() {
OMB_Helper::removeMagicQuotesFromRequest();
echo $this->getOAuthServer()->fetch_request_token(OAuthRequest::from_request());
}
/**
* Handle an user authorization request.
*
* Parses an authorization request. This includes OAuth and OMB verification.
* Throws exceptions on failures. Returns an OMB_Profile object representing
* the remote user.
*
* The OMB_Profile passed to the constructor of OMB_Service_Provider should
* not represent the user specified in the authorization request, but the one
* currently logged in to the service. This condition being satisfied,
* handleUserAuth will check whether the listener specified in the request is
* identical to the logged in user.
*
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* @access public
*
* @return OMB_Profile The profile of the soon-to-be subscribed, i. e. remote
* user
**/
public function handleUserAuth() {
OMB_Helper::removeMagicQuotesFromRequest();
/* Verify the request token. */
$this->token = $this->datastore->lookup_token(null, "request", $_GET['oauth_token']);
if (is_null($this->token)) {
throw new OAuthException('The given request token has not been issued ' .
'by this service.');
}
/* Verify the OMB part. */
if ($_GET['omb_version'] !== OMB_VERSION) {
throw OMB_RemoteServiceException::forRequest(OAUTH_ENDPOINT_AUTHORIZE,
'Wrong OMB version ' . $_GET['omb_version']);
}
if ($_GET['omb_listener'] !== $this->user->getIdentifierURI()) {
throw OMB_RemoteServiceException::forRequest(OAUTH_ENDPOINT_AUTHORIZE,
'Wrong OMB listener ' . $_GET['omb_listener']);
}
foreach (array('omb_listenee', 'omb_listenee_profile',
'omb_listenee_nickname', 'omb_listenee_license') as $param) {
if (!isset($_GET[$param]) || is_null($_GET[$param])) {
throw OMB_RemoteServiceException::forRequest(OAUTH_ENDPOINT_AUTHORIZE,
"Required parameter '$param' not found");
}
}
/* Store given callback for later use. */
if (isset($_GET['oauth_callback']) && $_GET['oauth_callback'] !== '') {
$this->callback = $_GET['oauth_callback'];
if (!OMB_Helper::validateURL($this->callback)) {
throw OMB_RemoteServiceException::forRequest(OAUTH_ENDPOINT_AUTHORIZE,
'Invalid callback URL specified');
}
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}
$this->remote_user = OMB_Profile::fromParameters($_GET, 'omb_listenee');
return $this->remote_user;
}
/**
* Continue the OAuth dance after user authorization
*
* Performs the appropriate actions after user answered the authorization
* request.
*
* @param bool $accepted Whether the user granted authorization
*
* @access public
*
* @return array A two-component array with the values:
* - callback The callback URL or null if none given
* - token The authorized request token or null if not
* authorized.
**/
public function continueUserAuth($accepted) {
$callback = $this->callback;
if (!$accepted) {
$this->datastore->revoke_token($this->token->key);
$this->token = null;
/* TODO: The handling is probably wrong in terms of OAuth 1.0 but the way
laconica works. Moreover I dont know the right way either. */
} else {
$this->datastore->authorize_token($this->token->key);
$this->datastore->saveProfile($this->remote_user);
$this->datastore->saveSubscription($this->user->getIdentifierURI(),
$this->remote_user->getIdentifierURI(), $this->token);
if (!is_null($this->callback)) {
/* Callback wants to get some informations as well. */
$params = $this->user->asParameters('omb_listener', false);
$params['oauth_token'] = $this->token->key;
$params['omb_version'] = OMB_VERSION;
$callback .= (parse_url($this->callback, PHP_URL_QUERY) ? '&' : '?');
foreach ($params as $k => $v) {
$callback .= OAuthUtil::urlencode_rfc3986($k) . '=' .
OAuthUtil::urlencode_rfc3986($v) . '&';
}
}
}
return array($callback, $this->token);
}
/**
* Echo an access token
*
* Outputs an access token for the query found in $_POST. OMB 0.1 specifies
* that the access token request has to be a POST even if OAuth allows GET as
* well.
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*
* @access public
**/
public function writeAccessToken() {
OMB_Helper::removeMagicQuotesFromRequest();
echo $this->getOAuthServer()->fetch_access_token(
OAuthRequest::from_request('POST'));
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}
/**
* Handle an updateprofile request
*
* Handles an updateprofile request posted to this service. Updates the
* profile through the OMB_Datastore.
*
* @access public
*
* @return OMB_Profile The updated profile
**/
public function handleUpdateProfile() {
list($req, $profile) = $this->handleOMBRequest(OMB_ENDPOINT_UPDATEPROFILE);
$profile->updateFromParameters($req->get_parameters(), 'omb_listenee');
$this->datastore->saveProfile($profile);
$this->finishOMBRequest();
return $profile;
}
/**
* Handle a postnotice request
*
* Handles a postnotice request posted to this service. Saves the notice
* through the OMB_Datastore.
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*
* @access public
*
* @return OMB_Notice The received notice
**/
public function handlePostNotice() {
list($req, $profile) = $this->handleOMBRequest(OMB_ENDPOINT_POSTNOTICE);
require_once 'notice.php';
$notice = OMB_Notice::fromParameters($profile, $req->get_parameters());
$this->datastore->saveNotice($notice);
$this->finishOMBRequest();
return $notice;
}
/**
* Handle an OMB request
*
* Performs common OMB request handling.
*
* @param string $uri The URI defining the OMB endpoint being served
*
* @access protected
*
* @return array(OAuthRequest, OMB_Profile)
**/
protected function handleOMBRequest($uri) {
OMB_Helper::removeMagicQuotesFromRequest();
$req = OAuthRequest::from_request('POST');
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$listenee = $req->get_parameter('omb_listenee');
try {
list($consumer, $token) = $this->getOAuthServer()->verify_request($req);
} catch (OAuthException $e) {
header('HTTP/1.1 403 Forbidden');
// @debug hack
throw OMB_RemoteServiceException::forRequest($uri,
'Revoked accesstoken for ' . $listenee . ': ' . $e->getMessage());
// @end debug
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throw OMB_RemoteServiceException::forRequest($uri,
'Revoked accesstoken for ' . $listenee);
}
$version = $req->get_parameter('omb_version');
if ($version !== OMB_VERSION) {
header('HTTP/1.1 400 Bad Request');
throw OMB_RemoteServiceException::forRequest($uri,
'Wrong OMB version ' . $version);
}
$profile = $this->datastore->getProfile($listenee);
if (is_null($profile)) {
header('HTTP/1.1 400 Bad Request');
throw OMB_RemoteServiceException::forRequest($uri,
'Unknown remote profile ' . $listenee);
}
$subscribers = $this->datastore->getSubscriptions($listenee);
if (count($subscribers) === 0) {
header('HTTP/1.1 403 Forbidden');
throw OMB_RemoteServiceException::forRequest($uri,
'No subscriber for ' . $listenee);
}
return array($req, $profile);
}
/**
* Finishes an OMB request handling
*
* Performs common OMB request handling finishing.
*
* @access protected
**/
protected function finishOMBRequest() {
header('HTTP/1.1 200 OK');
header('Content-type: text/plain');
/* There should be no clutter but the version. */
echo "omb_version=" . OMB_VERSION;
}
/**
* Return an OAuthServer
*
* Checks whether the OAuthServer is null. If so, initializes it with a
* default value. Returns the OAuth server.
*
* @access protected
**/
protected function getOAuthServer() {
if (is_null($this->oauth_server)) {
$this->oauth_server = new OAuthServer($this->datastore);
$this->oauth_server->add_signature_method(
new OAuthSignatureMethod_HMAC_SHA1());
}
return $this->oauth_server;
}
/**
* Publish a notice
*
* Posts an OMB notice. This includes storing the notice and posting it to
* subscribed users.
*
* @param OMB_Notice $notice The new notice
*
* @access public
*
* @return array An array mapping subscriber URIs to the exception posting to
* them has raised; Empty array if no exception occured
**/
public function postNotice($notice) {
$uri = $this->user->getIdentifierURI();
/* $notice is passed by reference and may change. */
$this->datastore->saveNotice($notice);
$subscribers = $this->datastore->getSubscriptions($uri);
/* No one to post to. */
if (is_null($subscribers)) {
return array();
}
require_once 'service_consumer.php';
$err = array();
foreach($subscribers as $subscriber) {
try {
$service = new OMB_Service_Consumer($subscriber['uri'], $uri, $this->datastore);
$service->setToken($subscriber['token'], $subscriber['secret']);
$service->postNotice($notice);
} catch (Exception $e) {
$err[$subscriber['uri']] = $e;
continue;
}
}
return $err;
}
/**
* Publish a profile update
*
* Posts the current profile as an OMB profile update. This includes updating
* the stored profile and posting it to subscribed users.
*
* @access public
*
* @return array An array mapping subscriber URIs to the exception posting to
* them has raised; Empty array if no exception occured
**/
public function updateProfile() {
$uri = $this->user->getIdentifierURI();
$this->datastore->saveProfile($this->user);
$subscribers = $this->datastore->getSubscriptions($uri);
/* No one to post to. */
if (is_null($subscribers)) {
return array();
}
require_once 'service_consumer.php';
$err = array();
foreach($subscribers as $subscriber) {
try {
$service = new OMB_Service_Consumer($subscriber['uri'], $uri, $this->datastore);
$service->setToken($subscriber['token'], $subscriber['secret']);
$service->updateProfile($this->user);
} catch (Exception $e) {
$err[$subscriber['uri']] = $e;
continue;
}
}
return $err;
}
}