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<?php
namespace Shaarli\Api;
use Shaarli\Api\Exceptions\ApiException;
use Shaarli\Api\Exceptions\ApiAuthorizationException;
use Slim\Container;
use Slim\Http\Request;
use Slim\Http\Response;
/**
* Class ApiMiddleware
*
* This will be called before accessing any API Controller.
* Its role is to make sure that the API is enabled, configured, and to validate the JWT token.
*
* If the request is validated, the controller is called, otherwise a JSON error response is returned.
*
* @package Api
*/
class ApiMiddleware
{
/**
* @var int JWT token validity in seconds (9 min).
*/
public static $TOKEN_DURATION = 540;
/**
* @var Container: contains conf, plugins, etc.
*/
protected $container;
/**
* @var \ConfigManager instance.
*/
protected $conf;
/**
* ApiMiddleware constructor.
*
* @param Container $container instance.
*/
public function __construct($container)
{
$this->container = $container;
$this->conf = $this->container->get('conf');
$this->setLinkDb($this->conf);
}
/**
* Middleware execution:
* - check the API request
* - execute the controller
* - return the response
*
* @param Request $request Slim request
* @param Response $response Slim response
* @param callable $next Next action
*
* @return Response response.
*/
public function __invoke($request, $response, $next)
{
try {
$this->checkRequest($request);
$response = $next($request, $response);
} catch(ApiException $e) {
$e->setResponse($response);
$e->setDebug($this->conf->get('dev.debug', false));
$response = $e->getApiResponse();
}
return $response;
}
/**
* Check the request validity (HTTP method, request value, etc.),
* that the API is enabled, and the JWT token validity.
*
* @param Request $request Slim request
*
* @throws ApiAuthorizationException The API is disabled or the token is invalid.
*/
protected function checkRequest($request)
{
if (! $this->conf->get('api.enabled', true)) {
throw new ApiAuthorizationException('API is disabled');
}
$this->checkToken($request);
}
/**
* Check that the JWT token is set and valid.
* The API secret setting must be set.
*
* @param Request $request Slim request
*
* @throws ApiAuthorizationException The token couldn't be validated.
*/
protected function checkToken($request) {
$jwt = $request->getHeaderLine('jwt');
if (empty($jwt)) {
throw new ApiAuthorizationException('JWT token not provided');
}
if (empty($this->conf->get('api.secret'))) {
throw new ApiAuthorizationException('Token secret must be set in Shaarli\'s administration');
}
ApiUtils::validateJwtToken($jwt, $this->conf->get('api.secret'));
}
/**
* Instantiate a new LinkDB including private links,
* and load in the Slim container.
*
* FIXME! LinkDB could use a refactoring to avoid this trick.
*
* @param \ConfigManager $conf instance.
*/
protected function setLinkDb($conf)
{
$linkDb = new \LinkDB(
$conf->get('resource.datastore'),
true,
$conf->get('privacy.hide_public_links'),
$conf->get('redirector.url'),
$conf->get('redirector.encode_url')
);
$this->container['db'] = $linkDb;
}
}
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