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<?php |
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namespace Psr7Middlewares\Middleware; |
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use Psr7Middlewares\Middleware; |
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use Psr7Middlewares\Utils; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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/** |
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* Middleware to create basic http authentication. |
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*/ |
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class BasicAuthentication |
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{ |
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use Utils\AuthenticationTrait; |
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const KEY = 'USERNAME'; |
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/** |
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* Returns the username. |
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* |
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* @param ServerRequestInterface $request |
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* |
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* @return string|null |
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*/ |
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public static function getUsername(ServerRequestInterface $request) |
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{ |
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return Middleware::getAttribute($request, self::KEY); |
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} |
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/** |
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* Execute the middleware. |
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* |
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* @param ServerRequestInterface $request |
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* @param ResponseInterface $response |
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* @param callable $next |
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* |
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* @return ResponseInterface |
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*/ |
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public function __invoke(ServerRequestInterface $request, ResponseInterface $response, callable $next) |
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{ |
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$authorization = self::parseAuthorizationHeader($request->getHeaderLine('Authorization')); |
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if ($authorization && $this->checkUserPassword($authorization['username'], $authorization['password'])) { |
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return $next( |
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Middleware::setAttribute($request, self::KEY, $authorization['username']), |
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$response |
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); |
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} |
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return $response |
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->withStatus(401) |
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->withHeader('WWW-Authenticate', 'Basic realm="'.$this->realm.'"'); |
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} |
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/** |
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* Validate the user and password. |
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* |
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* @param string $username |
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* @param string $password |
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* |
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* @return bool |
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*/ |
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private function checkUserPassword($username, $password) |
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{ |
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if (!isset($this->users[$username]) || $this->users[$username] !== $password) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Parses the authorization header for a basic authentication. |
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* |
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* @param string $header |
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* |
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* @return false|array |
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*/ |
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private static function parseAuthorizationHeader($header) |
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{ |
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if (strpos($header, 'Basic') !== 0) { |
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return false; |
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} |
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$header = explode(':', base64_decode(substr($header, 6)), 2); |
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return [ |
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'username' => $header[0], |
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'password' => isset($header[1]) ? $header[1] : null, |
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]; |
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} |
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} |
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oscarotero /
psr7-middlewares
