gnu-social/plugins/RSSCloud/actions/rsscloudrequestnotify.php

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<?php
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social 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.
//
// GNU social 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 GNU social. If not, see <http://www.gnu.org/licenses/>.
/**
* Action to let RSSCloud aggregators request update notification when
* user profile feeds change.
*
* @category Plugin
* @package GNUsocial
* @author Zach Copley <zach@status.net>
* @copyright 2009 StatusNet, Inc.
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
defined('GNUSOCIAL') || die();
/**
* Action class to handle RSSCloud notification (subscription) requests
*
* @category Plugin
* @package GNUsocial
* @author Zach Copley <zach@status.net>
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
class RSSCloudRequestNotifyAction extends Action
{
/**
* Initialization.
*
* @param array $args Web and URL arguments
* @return bool false if user doesn't exist
*/
public function prepare(array $args = [])
{
parent::prepare($args);
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$this->ip = $_SERVER['REMOTE_ADDR'];
$this->port = $this->arg('port');
$this->path = $this->arg('path');
if ($this->path[0] != '/') {
$this->path = '/' . $this->path;
}
$this->protocol = $this->arg('protocol');
$this->procedure = $this->arg('notifyProcedure');
$this->domain = $this->arg('domain');
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$this->feeds = $this->getFeeds();
return true;
}
/**
* Handle the request
*
* Checks for all the required parameters for a subscription,
* validates that the feed being subscribed to is real, and then
* saves the subsctiption.
*
* @param array $args $_REQUEST data (unused)
*
* @return void
*/
public function handle()
{
parent::handle();
if ($_SERVER['REQUEST_METHOD'] != 'POST') {
// TRANS: Form validation error displayed when POST is not used.
$this->showResult(false, _m('Request must be POST.'));
return;
}
$missing = array();
if (empty($this->port)) {
$missing[] = 'port';
}
if (empty($this->path)) {
$missing[] = 'path';
}
if (empty($this->protocol)) {
$missing[] = 'protocol';
} elseif (strtolower($this->protocol) !== 'http-post') {
// TRANS: Form validation error displayed when HTTP POST is not used.
$msg = _m('Only HTTP POST notifications are supported at this time.');
$this->showResult(false, $msg);
return;
}
if (!isset($this->procedure)) {
$missing[] = 'notifyProcedure';
}
if (!empty($missing)) {
// TRANS: List separator.
$separator = _m('SEPARATOR', ', ');
// TRANS: Form validation error displayed when a request body is missing expected parameters.
// TRANS: %s is a list of parameters separated by a list separator (default: ", ").
$msg = sprintf(
_m('The following parameters were missing from the request body: %s.'),
implode($separator, $missing)
);
$this->showResult(false, $msg);
return;
}
if (empty($this->feeds)) {
// TRANS: Form validation error displayed when not providing any valid profile feed URLs.
$msg = _m('You must provide at least one valid profile feed URL ' .
'(url1, url2, url3 ... urlN).');
$this->showResult(false, $msg);
return;
}
// We have to validate everything before saving anything.
// We only return one success or failure no matter how
// many feeds the subscriber is trying to subscribe to
foreach ($this->feeds as $feed) {
if (!$this->validateFeed($feed)) {
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$nh = $this->getNotifyUrl();
common_log(
LOG_WARNING,
"RSSCloud plugin - {$nh} tried to subscribe to invalid feed: {$feed}"
);
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// TRANS: Form validation error displayed when not providing a valid feed URL.
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$msg = _m('Feed subscription failed: Not a valid feed.');
$this->showResult(false, $msg);
return;
}
if (!$this->testNotificationHandler($feed)) {
// TRANS: Form validation error displayed when feed subscription failed.
$msg = _m('Feed subscription failed: ' .
'Notification handler does not respond correctly.');
$this->showResult(false, $msg);
return;
}
}
foreach ($this->feeds as $feed) {
$this->saveSubscription($feed);
}
// XXX: What to do about deleting stale subscriptions?
// 25 hours seems harsh. WordPress doesn't ever remove
// subscriptions.
// TRANS: Success message after subscribing to one or more feeds.
$msg = _m('Thanks for the subscription. ' .
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'When the feed(s) update(s), you will be notified.');
$this->showResult(true, $msg);
}
/**
* Validate that the requested feed is one we serve
* up via RSSCloud.
*
* @param string $feed the feed in question
* @return bool
*/
private function validateFeed(string $feed): bool
{
$user = $this->userFromFeed($feed);
if (empty($user)) {
return false;
}
return true;
}
/**
* Pull all of the urls (url1, url2, url3...urlN) that
* the subscriber wants to subscribe to.
*
* @return array $feeds the list of feeds
*/
public function getFeeds()
{
$feeds = [];
foreach ($this->args as $key => $feed) {
if (preg_match('/^url\d*$/', $key)) {
$feeds[] = $feed;
}
}
return $feeds;
}
/**
* Test that a notification handler is there and is reponding
* correctly. This is called before adding a subscription.
*
* @param string $feed the feed to verify
* @return bool success result
*/
private function testNotificationHandler(string $feed): bool
{
$notifyUrl = $this->getNotifyUrl();
$notifier = new RSSCloudNotifier();
if (isset($this->domain)) {
// 'domain' param set, so we have to use GET and send a challenge
common_log(
LOG_INFO,
'RSSCloud plugin - Testing notification handler with '
. "challenge: {$notifyUrl}"
);
return $notifier->challenge($notifyUrl, $feed);
} else {
common_log(
LOG_INFO,
'RSSCloud plugin - Testing notification handler: '
. $notifyUrl
);
return $notifier->postUpdate($notifyUrl, $feed);
}
}
/**
* Build the URL for the notification handler based on the
* parameters passed in with the subscription request.
*
* @return string notification handler url
*/
private function getNotifyUrl(): string
{
if (isset($this->domain)) {
return 'http://' . $this->domain . ':' . $this->port . $this->path;
} else {
return 'http://' . $this->ip . ':' . $this->port . $this->path;
}
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}
/**
* Uses the nickname part of the subscribed feed URL to figure out
* whethere there's really a user with such a feed. Used to
* validate feeds before adding a subscription.
*
* @param string $feed the feed in question
* @return bool success
*/
private function userFromFeed(string $feed): bool
{
// We only do canonical RSS2 profile feeds (specified by ID), e.g.:
// http://www.example.com/api/statuses/user_timeline/2.rss
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$path = common_path('api/statuses/user_timeline/');
$valid = '%^' . $path . '(?<id>.*)\.rss$%';
if (preg_match($valid, $feed, $matches)) {
$user = User::getKV('id', $matches['id']);
if (!empty($user)) {
return $user;
}
}
return false;
}
/**
* Save an RSSCloud subscription
*
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* @param string $feed a valid profile feed
* @return bool success result
*/
private function saveSubscription(string $feed): bool
{
$user = $this->userFromFeed($feed);
$notifyUrl = $this->getNotifyUrl();
$sub = RSSCloudSubscription::getSubscription($user->id, $notifyUrl);
if ($sub) {
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common_log(LOG_INFO, "RSSCloud plugin - $notifyUrl refreshed subscription" .
" to user $user->nickname (id: $user->id).");
} else {
$sub = new RSSCloudSubscription();
$sub->subscribed = $user->id;
$sub->url = $notifyUrl;
$sub->created = common_sql_now();
if (!$sub->insert()) {
common_log_db_error($sub, 'INSERT', __FILE__);
return false;
}
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common_log(LOG_INFO, "RSSCloud plugin - $notifyUrl subscribed" .
" to user $user->nickname (id: $user->id)");
}
return true;
}
/**
* Show an XML message indicating the subscription
* was successful or failed.
*
* @param bool $success whether it was good or bad
* @param string $msg the message to output
*
* @return bool success result
*/
public function showResult(bool $success, string $msg): bool
{
$this->startXML();
$this->elementStart('notifyResult', [
'success' => ($success ? 'true' : 'false'),
'msg' => $msg,
]);
$this->endXML();
}
}