gnu-social/actions/atompubsubscriptionfeed.php

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<?php
/**
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, StatusNet, Inc.
*
* AtomPub subscription feed
*
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* PHP version 5
*
* 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/>.
*
* @category Cache
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @copyright 2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
* @link http://status.net/
*/
if (!defined('STATUSNET')) {
// This check helps protect against security problems;
// your code file can't be executed directly from the web.
exit(1);
}
/**
* Subscription feed class for AtomPub
*
* Generates a list of the user's subscriptions
*
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* @category AtomPub
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @copyright 2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
* @link http://status.net/
*/
class AtompubsubscriptionfeedAction extends ApiAuthAction
{
private $_profile = null;
private $_subscriptions = null;
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/**
* For initializing members of the class.
*
* @param array $argarray misc. arguments
*
* @return boolean true
*/
function prepare($argarray)
{
parent::prepare($argarray);
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$subscriber = $this->trimmed('subscriber');
$this->_profile = Profile::getKV('id', $subscriber);
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if (empty($this->_profile)) {
// TRANS: Client exception thrown when trying to display a subscription for a non-existing profile ID.
// TRANS: %d is the non-existing profile ID number.
throw new ClientException(sprintf(_('No such profile id: %d.'),
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$subscriber), 404);
}
// page and count from ApiAction
$offset = ($this->page-1) * $this->count;
$this->_subscriptions = Subscription::bySubscriber($subscriber,
$offset,
$this->count + 1);
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return true;
}
/**
* Handler method
*
* @param array $argarray is ignored since it's now passed in in prepare()
*
* @return void
*/
function handle($argarray=null)
{
parent::handle($argarray);
switch ($_SERVER['REQUEST_METHOD']) {
case 'HEAD':
case 'GET':
$this->showFeed();
break;
case 'POST':
$this->addSubscription();
break;
default:
// TRANS: Client exception thrown when using an unsupported HTTP method.
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$this->clientError(_('HTTP method not supported.'), 405);
return;
}
return;
}
/**
* Show the feed of subscriptions
*
* @return void
*/
function showFeed()
{
header('Content-Type: application/atom+xml; charset=utf-8');
$url = common_local_url('AtomPubSubscriptionFeed',
array('subscriber' => $this->_profile->id));
$feed = new Atom10Feed(true);
$feed->addNamespace('activity',
'http://activitystrea.ms/spec/1.0/');
$feed->addNamespace('poco',
'http://portablecontacts.net/spec/1.0');
$feed->addNamespace('media',
'http://purl.org/syndication/atommedia');
$feed->id = $url;
$feed->setUpdated('now');
$feed->addAuthor($this->_profile->getBestName(),
$this->_profile->getURI());
// TRANS: Title for Atom subscription feed.
// TRANS: %s is a user nickname.
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$feed->setTitle(sprintf(_("%s subscriptions"),
$this->_profile->getBestName()));
// TRANS: Subtitle for Atom subscription feed.
// TRANS: %1$s is a user nickname, %s$s is the StatusNet sitename.
$feed->setSubtitle(sprintf(_("People %1\$s has subscribed to on %2\$s"),
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$this->_profile->getBestName(),
common_config('site', 'name')));
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$feed->addLink(common_local_url('subscriptions',
array('nickname' =>
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$this->_profile->nickname)));
$feed->addLink($url,
array('rel' => 'self',
'type' => 'application/atom+xml'));
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// If there's more...
if ($this->page > 1) {
$feed->addLink($url,
array('rel' => 'first',
'type' => 'application/atom+xml'));
$feed->addLink(common_local_url('AtomPubSubscriptionFeed',
array('subscriber' =>
$this->_profile->id),
array('page' =>
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$this->page - 1)),
array('rel' => 'prev',
'type' => 'application/atom+xml'));
}
if ($this->_subscriptions->N > $this->count) {
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$feed->addLink(common_local_url('AtomPubSubscriptionFeed',
array('subscriber' =>
$this->_profile->id),
array('page' =>
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$this->page + 1)),
array('rel' => 'next',
'type' => 'application/atom+xml'));
}
$i = 0;
// XXX: This is kind of inefficient
while ($this->_subscriptions->fetch()) {
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// We get one more than needed; skip that one
$i++;
if ($i > $this->count) {
break;
}
$act = $this->_subscriptions->asActivity();
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$feed->addEntryRaw($act->asString(false, false, false));
}
$this->raw($feed->getString());
}
/**
* Add a new subscription
*
* Handling the POST method for AtomPub
*
* @return void
*/
function addSubscription()
{
if (empty($this->auth_user) ||
$this->auth_user->id != $this->_profile->id) {
// TRANS: Client exception thrown when trying to subscribe another user.
throw new ClientException(_("Cannot add someone else's".
" subscription."), 403);
}
$xml = file_get_contents('php://input');
$dom = DOMDocument::loadXML($xml);
if ($dom->documentElement->namespaceURI != Activity::ATOM ||
$dom->documentElement->localName != 'entry') {
// TRANS: Client error displayed when not using an Atom entry.
$this->clientError(_('Atom post must be an Atom entry.'));
return;
}
$activity = new Activity($dom->documentElement);
$sub = null;
if (Event::handle('StartAtomPubNewActivity', array(&$activity))) {
if ($activity->verb != ActivityVerb::FOLLOW) {
// TRANS: Client error displayed when not using the follow verb.
$this->clientError(_('Can only handle Follow activities.'));
return;
}
$person = $activity->objects[0];
if ($person->type != ActivityObject::PERSON) {
// TRANS: Client exception thrown when subscribing to an object that is not a person.
$this->clientError(_('Can only follow people.'));
return;
}
// XXX: OStatus discovery (maybe)
$profile = Profile::fromURI($person->id);
if (empty($profile)) {
// TRANS: Client exception thrown when subscribing to a non-existing profile.
// TRANS: %s is the unknown profile ID.
$this->clientError(sprintf(_('Unknown profile %s.'), $person->id));
return;
}
if (Subscription::exists($this->_profile, $profile)) {
// 409 Conflict
// TRANS: Client error displayed trying to subscribe to an already subscribed profile.
// TRANS: %s is the profile the user already has a subscription on.
$this->clientError(sprintf(_('Already subscribed to %s.'),
$person->id),
409);
return;
}
if (Subscription::start($this->_profile, $profile)) {
$sub = Subscription::pkeyGet(array('subscriber' => $this->_profile->id,
'subscribed' => $profile->id));
}
Event::handle('EndAtomPubNewActivity', array($activity, $sub));
}
if (!empty($sub)) {
$act = $sub->asActivity();
header('Content-Type: application/atom+xml; charset=utf-8');
header('Content-Location: ' . $act->selfLink);
$this->startXML();
$this->raw($act->asString(true, true, true));
$this->endXML();
}
}
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/**
* Return true if read only.
*
* @param array $args other arguments
*
* @return boolean is read only action?
*/
function isReadOnly($args)
{
return $_SERVER['REQUEST_METHOD'] != 'POST';
}
/**
* Return last modified, if applicable.
*
* @return string last modified http header
*/
function lastModified()
{
return null;
}
/**
* Return etag, if applicable.
*
* @return string etag http header
*/
function etag()
{
return null;
}
/**
* Does this require authentication?
*
* @return boolean true if delete, else false
*/
function requiresAuth()
{
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
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return true;
} else {
return false;
}
}
}