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<?php
namespace phinde;
/**
* Database table containing information about Pubsubhubbub subscriptions
*/
class Subscriptions
{
protected $db;
public function __construct()
{
$this->db = new \PDO(
$GLOBALS['phinde']['db_dsn'],
$GLOBALS['phinde']['db_user'],
$GLOBALS['phinde']['db_pass']
);
$this->db->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
}
/**
* Fetch a topic
*
* @param string $topic Topic URL
*
* @return false|object False if the row does not exist
*/
public function get($topic)
{
$stmt = $this->db->prepare(
'SELECT * FROM subscriptions'
. ' WHERE sub_topic = :topic'
);
$stmt->execute([':topic' => $topic]);
//fetchObject() itself returns FALSE on failure
return $stmt->fetchObject();
}
/**
* Remove a topic
*
* @param string $topic Topic URL
*
* @return void
*/
public function remove($topic)
{
$stmt = $this->db->prepare(
'DELETE FROM subscriptions'
. ' WHERE sub_topic = :topic'
);
$stmt->execute([':topic' => $topic]);
}
/**
* Count number of subscriptions
*
* @return array Array of keys with different status, number as value
*/
public function count()
{
$stmt = $this->db->prepare(
'SELECT COUNT(*) as count, sub_status FROM subscriptions'
. ' GROUP BY sub_status'
. ' ORDER BY sub_status'
);
$stmt->execute();
$res = [];
foreach ($stmt as $row) {
$res[$row['sub_status']] = $row['count'];
}
return $res;
}
/**
* Get all topics that either expired or expire soon
*
* @return \PDOStatement Result iterator
*/
public function getExpiring()
{
$stmt = $this->db->prepare(
'SELECT * FROM subscriptions'
. ' WHERE'
. '('
//expire soon
. ' sub_status IN ("active", "expired")'
. ' AND DATEDIFF(sub_expires, NOW()) <= 2'
. ') OR ('
//no reaction to subscription within 10 minutes
. ' sub_status = "subscribing"'
. ' AND TIMEDIFF(NOW(), sub_created) > "00:10:00"'
. ')'
);
$stmt->execute();
return $stmt;
}
/**
* Create a new subscription entry in database.
* Automatically generates secret, capkey and lease seconds.
*
* This method does NOT:
* - check for duplicates (do it yourself)
* - return the object (fetch it yourself)
* - send subscription requests to the hub
*
* @param string $topic URL to subscribe to
* @param string $hub URL of the hub subscribing to
*
* @return void
*/
public function create($topic, $hub)
{
$stmt = $this->db->prepare(
'INSERT INTO subscriptions'
. ' (sub_topic, sub_status, sub_lease_seconds, sub_expires'
. ', sub_secret, sub_capkey, sub_hub, sub_created, sub_updated'
. ', sub_pings, sub_lastping, sub_statusmessage)'
. ' VALUES '
. ' (:topic, "subscribing", :lease_seconds, "0000-00-00 00:00:00"'
. ', :secret, :capkey, :hub, NOW(), NOW()'
. ', 0, "0000-00-00 00:00:00", "")'
);
$stmt->execute(
[
':topic' => $topic,
':lease_seconds' => 86400 * 30,
':secret' => bin2hex(openssl_random_pseudo_bytes(16)),
':capkey' => bin2hex(openssl_random_pseudo_bytes(16)),
':hub' => $hub,
]
);
}
/**
* Renew a subscription: Set its status to "subscribing"
*
* @param integer $subId Subscription ID
*
* @return void
*/
public function renew($subId)
{
$this->db->prepare(
'UPDATE subscriptions'
. ' SET sub_status = "subscribing"'
. ' , sub_updated = NOW()'
. ' WHERE sub_id = :id'
)->execute([':id' => $subId]);
}
/**
* A subscription has been confirmed by the hub - mark it as active.
*
* @param integer $subId Subscription ID
* @param integer $leaseSeconds Number of seconds until subscription expires
*
* @return void
*/
public function subscribed($subId, $leaseSeconds)
{
$this->db->prepare(
'UPDATE subscriptions'
. ' SET sub_status = "active"'
. ' , sub_lease_seconds = :leaseSeconds'
. ' , sub_expires = :expires'
. ' , sub_updated = NOW()'
. ' WHERE sub_id = :id'
)->execute(
[
':leaseSeconds' => $leaseSeconds,
':expires' => gmdate('Y-m-d H:i:s', time() + $leaseSeconds),
':id' => $subId,
]
);
}
/**
* Mark a subscription as "unsubscribed"
*
* @param integer $subId Subscription ID
*
* @return void
*/
public function unsubscribed($subId)
{
$this->db->prepare(
'UPDATE subscriptions'
. ' SET sub_status = "unsubscribed"'
. ' , sub_updated = NOW()'
. ' WHERE sub_id = :id'
)->execute([':id' => $subId]);
}
/**
* Subscription has been cancelled/denied for some reason
*
* @param integer $subId Subscription ID
* @param string $reason Cancellation reason
*
* @return void
*/
public function denied($subId, $reason)
{
$this->db->prepare(
'UPDATE subscriptions'
. ' SET sub_status = "denied"'
. ' , sub_statusmessage = :reason'
. ' , sub_updated = NOW()'
. ' WHERE sub_id = :id'
)->execute([':id' => $subId, ':reason' => $reason]);
}
/**
* Topic update notification has been received
*
* @param integer $subId Subscription ID
*
* @return void
*/
public function pinged($subId)
{
$this->db->prepare(
'UPDATE subscriptions'
. ' SET sub_pings = sub_pings + 1'
. ' , sub_lastping = NOW()'
. ' , sub_updated = NOW()'
. ' WHERE sub_id = :id'
)->execute([':id' => $subId]);
}
/**
* Detect the hub for the given topic URL
*
* @param string $url Topic URL
*
* @return array Topic URL and hub URL. Hub URL is NULL if there is none.
*/
public function detectHub($url)
{
$hue = new HubUrlExtractor();
$hue->setRequestTemplate(new HttpRequest());
$urls = $hue->getUrls($url);
//we violate the spec by not requiring a self URL
$topicUrl = isset($urls['self']) ? $urls['self'] : $url;
$hubUrl = isset($urls['hub']) ? $urls['hub'] : null;
return array($topicUrl, $hubUrl);
}
}
?>
|
