PhutilTwitchFuture.php
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PhutilTwitchFuture.php
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	<?php

	final class PhutilTwitchFuture extends FutureProxy {

	private $future;
	private $clientID;
	private $accessToken;
	private $action;
	private $params;
	private $method = 'GET';

	public function __construct() {
	parent::__construct(null);
	}

	public function setAccessToken($token) {
	$this->accessToken = $token;
	return $this;
	}

	public function setClientID($client_id) {
	$this->clientID = $client_id;
	return $this;
	}

	public function setRawTwitchQuery($action, array $params = array()) {
	$this->action = $action;
	$this->params = $params;
	return $this;
	}

	public function setMethod($method) {
	$this->method = $method;
	return $this;
	}

	protected function getProxiedFuture() {
	if (!$this->future) {
	$params = $this->params;

	if (!$this->action) {
	throw new Exception(pht('You must %s!', 'setRawTwitchQuery()'));
	}

	if (!$this->accessToken) {
	throw new Exception(pht('You must %s!', 'setAccessToken()'));
	}

	$uri = new PhutilURI('https://api.twitch.tv/');
	$uri->setPath('/helix/'.ltrim($this->action, '/'));

	$future = new HTTPSFuture($uri);
	$future->setData($this->params);
	$future->setMethod($this->method);
	$future->addHeader('Authorization', 'Bearer '.$this->accessToken);

	// NOTE: This is how the Twitch API is versioned.
	$future->addHeader('Accept', 'application/vnd.twitchtv.2+json');

	// NOTE: This is required to avoid rate limiting.
	$future->addHeader('Client-ID', $this->clientID);

	$this->future = $future;
	}

	return $this->future;
	}

	protected function didReceiveResult($result) {
	list($status, $body, $headers) = $result;

	if ($status->isError()) {
	throw $status;
	}

	$data = null;
	try {
	$data = phutil_json_decode($body);
	} catch (PhutilJSONParserException $ex) {
	throw new PhutilProxyException(
	pht('Expected JSON response from Twitch.'),
	$ex);
	}

	if (idx($data, 'error')) {
	$error = $data['error'];
	throw new Exception(pht('Received error from Twitch: %s', $error));
	}

	return $data['data'][0];
	}

	}

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