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libphutil/src/future/github/PhutilGitHubFuture.php
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PhutilGitHubFuture.php
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<?php
final class PhutilGitHubFuture extends FutureProxy {
private $future;
private $accessToken;
private $action;
private $params;
private $method = 'GET';
private $headers = array();
public function __construct() {
parent::__construct(null);
}
public function setAccessToken($token) {
$this->accessToken = $token;
return $this;
}
public function setRawGitHubQuery($action, array $params = array()) {
$this->action = $action;
$this->params = $params;
return $this;
}
public function setMethod($method) {
$this->method = $method;
return $this;
}
public function addHeader($key, $value) {
$this->headers[] = array($key, $value);
return $this;
}
protected function getProxiedFuture() {
if (!$this->future) {
$params = $this->params;
if (!$this->action) {
throw new Exception(
pht(
'You must %s!',
'setRawGitHubQuery()'));
}
if (!$this->accessToken) {
throw new Exception(
pht(
'You must %s!',
'setAccessToken()'));
}
$uri = new PhutilURI('https://api.github.com/');
$uri->setPath('/'.ltrim($this->action, '/'));
$future = new HTTPSFuture($uri);
$future->setData($this->params);
$future->addHeader('Authorization', 'token '.$this->accessToken);
// NOTE: GitHub requires a 'User-Agent' header.
$future->addHeader('User-Agent', __CLASS__);
$future->setMethod($this->method);
foreach ($this->headers as $header) {
list($key, $value) = $header;
$future->addHeader($key, $value);
}
$this->future = $future;
}
return $this->future;
}
protected function didReceiveResult($result) {
list($status, $body, $headers) = $result;
if ($status->isError()) {
if ($this->isRateLimitResponse($status, $headers)) {
// Do nothing, this is a rate limit.
} else if ($this->isNotModifiedResponse($status)) {
// Do nothing, this is a "Not Modified" response.
} else {
// This is an error condition we do not expect.
throw $status;
}
}
try {
if (strlen($body)) {
$data = phutil_json_decode($body);
} else {
// This can happen for 304 responses.
$data = array();
}
} catch (PhutilJSONParserException $ex) {
throw new PhutilProxyException(
pht('Expected JSON response from GitHub.'),
$ex);
}
return id(new PhutilGitHubResponse())
->setStatus($status)
->setHeaders($headers)
->setBody($data);
}
private function isNotModifiedResponse($status) {
return ($status->getStatusCode() == 304);
}
private function isRateLimitResponse($status, array $headers) {
if ($status->getStatusCode() != 403) {
return false;
}
foreach ($headers as $header) {
list($key, $value) = $header;
if (phutil_utf8_strtolower($key) === 'x-ratelimit-remaining') {
if (!(int)$value) {
return true;
}
}
}
return false;
}
}
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