gnu-social/plugins/OStatus/actions/ostatussub.php

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<?php
/*
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, StatusNet, 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/>.
*/
/**
* @package OStatusPlugin
* @maintainer James Walker <james@status.net>
*/
if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
class OStatusSubAction extends Action
{
protected $feedurl;
function title()
{
return _m("OStatus Subscribe");
}
function handle($args)
{
if ($this->validateFeed()) {
$this->showForm();
}
return true;
}
function showForm($err = null)
{
$this->err = $err;
$this->showPage();
}
function showContent()
{
$user = common_current_user();
$profile = $user->getProfile();
$fuser = null;
$flink = Foreign_link::getByUserID($user->id, FEEDSUB_SERVICE);
if (!empty($flink)) {
$fuser = $flink->getForeignUser();
}
$this->elementStart('form', array('method' => 'post',
'id' => 'form_settings_feedsub',
'class' => 'form_settings',
'action' =>
common_local_url('feedsubsettings')));
$this->hidden('token', common_session_token());
$this->elementStart('fieldset', array('id' => 'settings_feeds'));
$this->elementStart('ul', 'form_data');
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$this->elementStart('li');
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$this->input('feedurl', _('Feed URL'), $this->feedurl, _('Enter the URL of a PubSubHubbub-enabled feed'));
$this->elementEnd('li');
$this->elementEnd('ul');
$this->submit('subscribe', _m('Subscribe'));
$this->elementEnd('fieldset');
$this->elementEnd('form');
$this->previewFeed();
}
/**
* Handle posts to this form
*
* Based on the button that was pressed, muxes out to other functions
* to do the actual task requested.
*
* All sub-functions reload the form with a message -- success or failure.
*
* @return void
*/
function handlePost()
{
// CSRF protection
$token = $this->trimmed('token');
if (!$token || $token != common_session_token()) {
$this->showForm(_('There was a problem with your session token. '.
'Try again, please.'));
return;
}
if ($this->arg('subscribe')) {
$this->saveFeed();
} else {
$this->showForm(_('Unexpected form submission.'));
}
}
/**
* Set up and add a feed
*
* @return boolean true if feed successfully read
* Sends you back to input form if not.
*/
function validateFeed()
{
$feedurl = $this->trimmed('feed');
if ($feedurl == '') {
$this->showForm(_m('Empty feed URL!'));
return;
}
$this->feedurl = $feedurl;
// Get the canonical feed URI and check it
try {
$discover = new FeedDiscovery();
$uri = $discover->discoverFromURL($feedurl);
} catch (FeedSubBadURLException $e) {
$this->showForm(_m('Invalid URL or could not reach server.'));
return false;
} catch (FeedSubBadResponseException $e) {
$this->showForm(_m('Cannot read feed; server returned error.'));
return false;
} catch (FeedSubEmptyException $e) {
$this->showForm(_m('Cannot read feed; server returned an empty page.'));
return false;
} catch (FeedSubBadHTMLException $e) {
$this->showForm(_m('Bad HTML, could not find feed link.'));
return false;
} catch (FeedSubNoFeedException $e) {
$this->showForm(_m('Could not find a feed linked from this URL.'));
return false;
} catch (FeedSubUnrecognizedTypeException $e) {
$this->showForm(_m('Not a recognized feed type.'));
return false;
} catch (FeedSubException $e) {
// Any new ones we forgot about
$this->showForm(_m('Bad feed URL.'));
return false;
}
$this->munger = $discover->feedMunger();
$this->profile = $this->munger->ostatusProfile();
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if ($this->profile->huburi == '') {
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$this->showForm(_m('Feed is not PuSH-enabled; cannot subscribe.'));
return false;
}
return true;
}
function saveFeed()
{
if ($this->validateFeed()) {
$this->preview = true;
$this->profile = Ostatus_profile::ensureProfile($this->munger);
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// If not already in use, subscribe to updates via the hub
if ($this->profile->sub_start) {
common_log(LOG_INFO, __METHOD__ . ": double the fun! new sub for {$this->profile->feeduri} last subbed {$this->profile->sub_start}");
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} else {
$ok = $this->profile->subscribe();
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common_log(LOG_INFO, __METHOD__ . ": sub was $ok");
if (!$ok) {
$this->showForm(_m('Feed subscription failed! Bad response from hub.'));
return;
}
}
// And subscribe the current user to the local profile
$user = common_current_user();
$profile = $this->profile->getProfile();
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if ($user->isSubscribed($profile)) {
$this->showForm(_m('Already subscribed!'));
} elseif ($user->subscribeTo($profile)) {
$this->showForm(_m('Feed subscribed!'));
} else {
$this->showForm(_m('Feed subscription failed!'));
}
}
}
function previewFeed()
{
$profile = $this->munger->ostatusProfile();
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$notice = $this->munger->notice(0, true); // preview
if ($notice) {
$this->element('b', null, 'Preview of latest post from this feed:');
$item = new NoticeList($notice, $this);
$item->show();
} else {
$this->element('b', null, 'No posts in this feed yet.');
}
}
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}