138 lines
3.8 KiB
PHP
138 lines
3.8 KiB
PHP
<?php
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namespace Shaarli\Api;
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use Shaarli\Api\Exceptions\ApiException;
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use Shaarli\Api\Exceptions\ApiAuthorizationException;
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use Shaarli\Config\ConfigManager;
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use Slim\Container;
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use Slim\Http\Request;
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use Slim\Http\Response;
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/**
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* Class ApiMiddleware
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*
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* This will be called before accessing any API Controller.
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* Its role is to make sure that the API is enabled, configured, and to validate the JWT token.
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*
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* If the request is validated, the controller is called, otherwise a JSON error response is returned.
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*
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* @package Api
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*/
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class ApiMiddleware
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{
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/**
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* @var int JWT token validity in seconds (9 min).
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*/
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public static $TOKEN_DURATION = 540;
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/**
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* @var Container: contains conf, plugins, etc.
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*/
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protected $container;
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/**
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* @var ConfigManager instance.
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*/
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protected $conf;
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/**
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* ApiMiddleware constructor.
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*
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* @param Container $container instance.
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*/
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public function __construct($container)
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{
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$this->container = $container;
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$this->conf = $this->container->get('conf');
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$this->setLinkDb($this->conf);
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}
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/**
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* Middleware execution:
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* - check the API request
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* - execute the controller
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* - return the response
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*
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* @param Request $request Slim request
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* @param Response $response Slim response
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* @param callable $next Next action
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*
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* @return Response response.
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*/
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public function __invoke($request, $response, $next)
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{
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try {
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$this->checkRequest($request);
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$response = $next($request, $response);
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} catch(ApiException $e) {
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$e->setResponse($response);
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$e->setDebug($this->conf->get('dev.debug', false));
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$response = $e->getApiResponse();
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}
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return $response;
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}
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/**
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* Check the request validity (HTTP method, request value, etc.),
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* that the API is enabled, and the JWT token validity.
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*
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* @param Request $request Slim request
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*
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* @throws ApiAuthorizationException The API is disabled or the token is invalid.
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*/
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protected function checkRequest($request)
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{
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if (! $this->conf->get('api.enabled', true)) {
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throw new ApiAuthorizationException('API is disabled');
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}
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$this->checkToken($request);
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}
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/**
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* Check that the JWT token is set and valid.
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* The API secret setting must be set.
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*
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* @param Request $request Slim request
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*
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* @throws ApiAuthorizationException The token couldn't be validated.
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*/
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protected function checkToken($request) {
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if (! $request->hasHeader('Authorization')) {
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throw new ApiAuthorizationException('JWT token not provided');
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}
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if (empty($this->conf->get('api.secret'))) {
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throw new ApiAuthorizationException('Token secret must be set in Shaarli\'s administration');
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}
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$authorization = $request->getHeaderLine('Authorization');
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if (! preg_match('/^Bearer (.*)/i', $authorization, $matches)) {
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throw new ApiAuthorizationException('Invalid JWT header');
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}
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ApiUtils::validateJwtToken($matches[1], $this->conf->get('api.secret'));
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}
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/**
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* Instantiate a new LinkDB including private links,
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* and load in the Slim container.
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*
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* FIXME! LinkDB could use a refactoring to avoid this trick.
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*
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* @param ConfigManager $conf instance.
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*/
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protected function setLinkDb($conf)
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{
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$linkDb = new \LinkDB(
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$conf->get('resource.datastore'),
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true,
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$conf->get('privacy.hide_public_links'),
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$conf->get('redirector.url'),
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$conf->get('redirector.encode_url')
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);
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$this->container['db'] = $linkDb;
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}
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}
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