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<?php declare (strict_types=1); |
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namespace OpenStack\Common\Auth; |
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use function GuzzleHttp\Psr7\modify_request; |
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use Psr\Http\Message\RequestInterface; |
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/** |
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* This class is responsible for three tasks: |
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* |
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* 1. performing the initial authentication for OpenStack services |
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* 2. populating the ``X-Auth-Token`` header for every HTTP request |
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* 3. checking the token expiry before each request, and re-authenticating if necessary |
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*/ |
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class AuthHandler |
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{ |
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/** @var callable */ |
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private $nextHandler; |
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/** @var callable */ |
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private $tokenGenerator; |
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/** @var Token */ |
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private $token; |
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/** |
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* @param callable $nextHandler |
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* @param callable $tokenGenerator |
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*/ |
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public function __construct(callable $nextHandler, callable $tokenGenerator, Token $token = null) |
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{ |
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$this->nextHandler = $nextHandler; |
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$this->tokenGenerator = $tokenGenerator; |
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$this->token = $token; |
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} |
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/** |
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* This method is invoked before every HTTP request is sent to the API. When this happens, it |
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* checks to see whether a token is set and valid, and then sets the ``X-Auth-Token`` header |
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* for the HTTP request before letting it continue on its merry way. |
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* |
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* @param RequestInterface $request |
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* @param array $options |
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* |
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* @return mixed|void |
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*/ |
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public function __invoke(RequestInterface $request, array $options) |
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{ |
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$fn = $this->nextHandler; |
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if ($this->shouldIgnore($request)) { |
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return $fn($request, $options); |
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} |
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if (!$this->token || $this->token->hasExpired()) { |
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$this->token = call_user_func($this->tokenGenerator); |
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} |
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$modify = ['set_headers' => ['X-Auth-Token' => $this->token->getId()]]; |
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return $fn(modify_request($request, $modify), $options); |
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} |
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/** |
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* Internal method which prevents infinite recursion. For certain requests, like the initial |
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* auth call itself, we do NOT want to send a token. |
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* |
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* @param RequestInterface $request |
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* |
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* @return bool |
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*/ |
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private function shouldIgnore(RequestInterface $request): bool |
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{ |
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return strpos((string) $request->getUri(), 'tokens') !== false && $request->getMethod() == 'POST'; |
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} |
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} |
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php-opencloud /
openstack
