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<?php |
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/** |
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* Copyright (C) 2016 SURFnet. |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Affero General Public License as |
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* published by the Free Software Foundation, either version 3 of the |
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* License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Affero General Public License for more details. |
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* |
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* You should have received a copy of the GNU Affero General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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namespace fkooman\RemoteStorage\OAuth; |
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use fkooman\RemoteStorage\Http\Exception\HttpException; |
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use fkooman\RemoteStorage\Http\Request; |
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class BearerAuthentication |
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{ |
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/** @var TokenStorage */ |
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private $tokenStorage; |
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/** @var string */ |
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private $realm; |
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public function __construct(TokenStorage $tokenStorage, $realm = 'Protected Area') |
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{ |
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$this->tokenStorage = $tokenStorage; |
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$this->realm = $realm; |
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} |
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public function optionalAuth(Request $request) |
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{ |
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$authorizationHeader = $request->getHeader('HTTP_AUTHORIZATION', false, null); |
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// is authorization header there? |
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if (is_null($authorizationHeader)) { |
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return false; |
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} |
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return $this->requireAuth($request); |
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} |
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public function requireAuth(Request $request) |
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{ |
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$authorizationHeader = $request->getHeader('HTTP_AUTHORIZATION'); |
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// validate the HTTP_AUTHORIZATION header |
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if (false === $bearerToken = self::getBearerToken($authorizationHeader)) { |
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throw $this->invalidTokenException(); |
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} |
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$accessTokenKey = $bearerToken[0]; |
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$accessToken = $bearerToken[1]; |
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$tokenInfo = $this->tokenStorage->get($accessTokenKey); |
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if (false === $tokenInfo) { |
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throw $this->invalidTokenException(); |
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} |
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// time safe string compare, using polyfill on PHP < 5.6 |
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if (hash_equals($tokenInfo['access_token'], $accessToken)) { |
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return new TokenInfo($tokenInfo); |
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} |
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throw $this->invalidTokenException(); |
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} |
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private static function getBearerToken($authorizationHeader) |
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{ |
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if (1 !== preg_match('|^Bearer ([[:alpha:][:digit:]-._~+/]+=*)$|', $authorizationHeader, $m)) { |
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return false; |
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} |
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$bearerToken = $m[1]; |
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if (false === strpos($bearerToken, '.')) { |
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return false; |
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} |
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return explode('.', $bearerToken); |
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} |
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private function invalidTokenException() |
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{ |
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return new HttpException( |
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'invalid_token', |
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401, |
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[ |
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'WWW-Authenticate' => sprintf( |
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'Bearer realm="%s",error="invalid_token"', |
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$this->realm |
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), |
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] |
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); |
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} |
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} |
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fkooman /
php-remote-storage
