/**
* Updates the request with an Authorization header when auth is 'fetched_auth_token'.
*
* use GuzzleHttp\Client;
* use Google\Auth\OAuth2;
* use Google\Auth\Subscriber\AuthTokenSubscriber;
*
* $config = [..<oauth config param>.];
* $oauth2 = new OAuth2($config)
* $subscriber = new AuthTokenSubscriber(
* $oauth2,
* ['prefix' => 'OAuth2::'],
* $cache = new Memcache()
* );
*
* $client = new Client([
* 'base_url' => 'https://www.googleapis.com/taskqueue/v1beta2/projects/',
* 'defaults' => ['auth' => 'google_auth']
* ]);
* $client->getEmitter()->attach($subscriber);
*
* $res = $client->get('myproject/taskqueues/myqueue');
*
* @param BeforeEvent $event
*/
public function onBefore(BeforeEvent $event)
{
// Requests using "auth"="google_auth" will be authorized.
$request = $event->getRequest();
if ($request->getConfig()['auth'] != 'google_auth') {
return;
}
// Use the cached value if its available.
//
// TODO: correct caching; update the call to setCachedValue to set the expiry
// to the value returned with the auth token.
//
// TODO: correct caching; enable the cache to be cleared.
$cached = $this->getCachedValue();
if (!empty($cached)) {
$request->setHeader('Authorization', 'Bearer ' . $cached);
return;
}
// Fetch the auth token.
$auth_tokens = $this->fetcher->fetchAuthToken($this->httpHandler);
if (array_key_exists('access_token', $auth_tokens)) {
$request->setHeader('Authorization', 'Bearer ' . $auth_tokens['access_token']);
$this->setCachedValue($auth_tokens['access_token']);
// notify the callback if applicable
if ($this->tokenCallback) {
call_user_func($this->tokenCallback, $this->getFullCacheKey(), $auth_tokens['access_token']);
}
}
}
/**
* Implements FetchAuthTokenInterface#fetchAuthToken.
*
* Checks the cache for a valid auth token and fetches the auth tokens
* from the supplied fetcher.
*
* @param callable $httpHandler callback which delivers psr7 request
*
* @return array the response
*
* @throws \Exception
*/
public function fetchAuthToken(callable $httpHandler = null)
{
// Use the cached value if its available.
//
// TODO: correct caching; update the call to setCachedValue to set the expiry
// to the value returned with the auth token.
//
// TODO: correct caching; enable the cache to be cleared.
$cacheKey = $this->fetcher->getCacheKey();
$cached = $this->getCachedValue($cacheKey);
if (!empty($cached)) {
return ['access_token' => $cached];
}
$auth_token = $this->fetcher->fetchAuthToken($httpHandler);
if (isset($auth_token['access_token'])) {
$this->setCachedValue($cacheKey, $auth_token['access_token']);
}
return $auth_token;
}
/**
* Call fetcher to fetch the token.
*
* @return string
*/
private function fetchToken()
{
$auth_tokens = $this->fetcher->fetchAuthToken($this->httpHandler);
if (array_key_exists('access_token', $auth_tokens)) {
// notify the callback if applicable
if ($this->tokenCallback) {
call_user_func($this->tokenCallback, $this->fetcher->getCacheKey(), $auth_tokens['access_token']);
}
return $auth_tokens['access_token'];
}
}
/**
* Updates the request with an Authorization header when auth is 'fetched_auth_token'.
*
* use GuzzleHttp\Client;
* use Google\Auth\OAuth2;
* use Google\Auth\Subscriber\AuthTokenSubscriber;
*
* $config = [..<oauth config param>.];
* $oauth2 = new OAuth2($config)
* $subscriber = new AuthTokenSubscriber($oauth2);
*
* $client = new Client([
* 'base_url' => 'https://www.googleapis.com/taskqueue/v1beta2/projects/',
* 'defaults' => ['auth' => 'google_auth']
* ]);
* $client->getEmitter()->attach($subscriber);
*
* $res = $client->get('myproject/taskqueues/myqueue');
*
* @param BeforeEvent $event
*/
public function onBefore(BeforeEvent $event)
{
// Requests using "auth"="google_auth" will be authorized.
$request = $event->getRequest();
if ($request->getConfig()['auth'] != 'google_auth') {
return;
}
// Fetch the auth token.
$auth_tokens = $this->fetcher->fetchAuthToken($this->httpHandler);
if (array_key_exists('access_token', $auth_tokens)) {
$request->setHeader('Authorization', 'Bearer ' . $auth_tokens['access_token']);
// notify the callback if applicable
if ($this->tokenCallback) {
call_user_func($this->tokenCallback, $this->fetcher->getCacheKey(), $auth_tokens['access_token']);
}
}
}
/**
* Determine if token is available in the cache, if not call fetcher to
* fetch it.
*
* @return string
*/
private function fetchToken()
{
// TODO: correct caching; update the call to setCachedValue to set the expiry
// to the value returned with the auth token.
//
// TODO: correct caching; enable the cache to be cleared.
$cached = $this->getCachedValue();
if (!empty($cached)) {
return $cached;
}
$auth_tokens = $this->fetcher->fetchAuthToken($this->httpHandler);
if (array_key_exists('access_token', $auth_tokens)) {
$this->setCachedValue($auth_tokens['access_token']);
// notify the callback if applicable
if ($this->tokenCallback) {
call_user_func($this->tokenCallback, $this->getFullCacheKey(), $auth_tokens['access_token']);
}
return $auth_tokens['access_token'];
}
}
