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<?php
namespace PayPal\Http;
use GuzzleHttp\Client;
use GuzzleHttp\Exception\GuzzleException;
use GuzzleHttp\Exception\RequestException;
use GuzzleHttp\Utils;
use PayPal\Http\Environment\Environment;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
use stdClass;
class PayPalClient implements HttpClient
{
protected Environment $environment;
protected Client $client;
protected ?AccessToken $access_token;
/**
* HttpClient constructor. Pass the environment you wish to make calls to.
* @param Environment $environment
* @see Environment
*/
public function __construct(Environment $environment)
{
$this->environment = $environment;
$this->client = new Client([
'base_uri' => $environment->baseUrl(),
'timeout' => 30,
'connect_timeout' => 10,
]);
$this->access_token = null;
}
/**
* Send http request.
*
* @param RequestInterface $request
* @return ResponseInterface
* @throws GuzzleException
* @throws RequestException
*/
public function send(RequestInterface $request): ResponseInterface
{
// if request doesn't have an authorization header
if (!$this->hasAuthHeader($request)) {
// fetch access token if null or expired
if ($this->hasInvalidToken()) {
$this->fetchAccessToken();
}
// add Authorization header to request
if ($this->access_token) {
$request = $request->withHeader('Authorization', $this->access_token->authorizationString() ?? '');
}
}
$request = $this->injectUserAgentHeaders($request);
$request = $this->injectSdkHeaders($request);
$request = $this->injectGzipHeaders($request);
return $this->client->send($request);
}
/**
* Check if headers contain an auth header.
*
* @param RequestInterface $request
* @return bool
*/
public function hasAuthHeader(RequestInterface $request): bool
{
return array_key_exists('Authorization', $request->getHeaders());
}
/**
* Check if request has a valid token
*
* @return bool
*/
public function hasInvalidToken(): bool
{
return !$this->access_token || $this->access_token->isExpired();
}
/**
* Sends a request that fetches the access token.
*
* @return AccessToken
* @throws GuzzleException
*/
public function fetchAccessToken(): AccessToken
{
$response = $this->client->send(new AccessTokenRequest($this->environment));
/** @var stdClass $result */
$result = Utils::jsonDecode($response->getBody()->getContents());
$this->access_token = new AccessToken($result->access_token, $result->token_type, $result->expires_in);
return $this->access_token;
}
/**
* Injects default user-agent into the request.
*
* @param RequestInterface $request
* @return RequestInterface
*/
public function injectUserAgentHeaders(RequestInterface $request): RequestInterface
{
return $request->withHeader('User-Agent', 'PayPalHttp-PHP HTTP/1.1');
}
/**
* Inject PayPal sdk headers into request.
*
* @param RequestInterface $request
* @return RequestInterface
*/
public function injectSdkHeaders(RequestInterface $request): RequestInterface
{
$r = $request->withHeader('sdk_name', 'PayPal PHP SDK')
->withHeader('sdk_version', '1.0.0');
/*
* Only inject this header on production
*
* @see https://github.com/phpjuice/paypal-http-client/issues/6
*/
if ('production' == $this->environment->name()) {
$r = $r->withHeader('sdk_tech_stack', 'PHP '.PHP_VERSION);
}
return $r;
}
/**
* Inject gzip headers into the request.
*
* @param RequestInterface $request
* @return RequestInterface
*/
public function injectGzipHeaders(RequestInterface $request): RequestInterface
{
return $request->withHeader('Accept-Encoding', 'gzip');
}
/**
* Set custom Guzzle Http client.
*/
public function setClient(Client $client): self
{
$this->client = $client;
return $this;
}
}