/**
* Create a resource image from a URL.
*
* @param string $url The URL to create the resource from.
* @param \pdyn\cache\CacheInterface $cache A caching object.
* @param \pdyn\httpclient\HttpClientInterface $httpclient An HttpClientInterface instance.
* @param int $ttl How long the cached information will stay valid, in seconds.
* @return HttpResource An HttpResource object, or one of it's decendents.
*/
public static function instance($url, \pdyn\cache\CacheInterface $cache, \pdyn\httpclient\HttpClientInterface $httpclient, $ttl = 7200)
{
// Normalize/validate URL.
$url = \pdyn\datatype\Url::normalize($url);
if (!\pdyn\datatype\Url::validate($url)) {
throw new Exception('Invalid URL: ' . $url, Exception::ERR_BAD_REQUEST);
}
$cache_key = sha1($url);
$link_info = $cache->get('link_basic', $cache_key);
if (!empty($link_info) && is_array($link_info)) {
$link_info = $link_info['data'];
} else {
$response = $httpclient->get($url);
$link_info = ['mime_type' => mb_strtolower($response->mime_type()), 'body' => base64_encode(gzdeflate($response->body(), 9)), 'url' => $url];
$link_info['handler'] = static::detect_resource_type($url, $link_info['mime_type'], $response->body());
$cache->store('link_basic', $cache_key, $link_info, time() + $ttl);
}
unset($link_info['body']);
$resourcetypes = static::getresourcetypes();
$classname = $link_info['handler'];
if (in_array($classname, $resourcetypes)) {
$resource = new $classname($url, $cache, $httpclient, $ttl, $link_info);
return $resource;
} else {
throw new Exception('rmtRes: did not know how to handle ' . $link_info['handler'] . ' resource type', Exception::ERR_BAD_REQUEST);
}
}
/**
* This sends a request to the hub.
*
* @param string $mode The request mode. 'subscribe' or 'unsubscribe'
* @param string $url The URL to send the request to - the hub URL.
* @param string $topic The topic you are referring to.
* @param string $callback The local callback URL.
* @param \pdyn\httpclient\HttpClientInterface $httpclient An HttpClientInterface object that will handle the transfer.
* @return bool|array True if successful, array of 'status_code', and 'msg', specifying received http code and body text.
*/
protected function send_request($mode, $url, $topic, $callback, \pdyn\httpclient\HttpClientInterface $httpclient)
{
if (!\pdyn\datatype\Url::validate($callback)) {
throw new Exception('Bad $callback received', Exception::ERR_BAD_REQUEST);
}
if (!\pdyn\datatype\Url::validate($url)) {
throw new Exception('Bad $url received', Exception::ERR_BAD_REQUEST);
}
$request = $this->storage->get_request($mode, $topic, $url, $callback);
$verifytoken = \pdyn\base\Utils::genRandomStr(64);
if (empty($request)) {
$request = $this->storage->create_request($mode, $topic, $url, $callback, $verifytoken);
}
$postdata = ['hub.mode' => $mode, 'hub.callback' => $callback, 'hub.topic' => $topic, 'hub.verify' => 'async', 'hub.verify_token' => $verifytoken, 'hub.lease_seconds' => 604800];
$response = $httpclient->post($url, $postdata);
if ($response->status_code() === 204 || $response->status_code() === 202) {
return true;
} else {
$this->storage->delete_request($request->id);
return ['status_code' => $response->status_code(), 'msg' => $response->body()];
}
}
/**
* Verify an incoming request.
*
* @param \pdyn\httpclient\HttpClientInterface $httpclient An HttpClientInterface instance.
* @param Request $request The request object.
* @param string $challenge Set the challenge string. If empty, a random one will be chosen.
* @return bool Whether the verification was successful.
*/
public function verify_request(\pdyn\httpclient\HttpClientInterface $httpclient, Request $request, $challenge = '')
{
if (empty($challenge)) {
$challenge = md5(rand() . rand() . rand() . microtime());
}
$params = ['hub.mode' => $request->mode, 'hub.topic' => $request->topic, 'hub.challenge' => $challenge, 'hub.lease_seconds' => $request->leaseseconds];
if (!empty($request->token)) {
$params['hub.verify_token'] = $request->token;
}
$response = $httpclient->get($request->callback, $params);
return $response->status_type() === 'success' && $response->body() === $challenge ? true : false;
}
