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<?php |
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namespace Psr7Middlewares\Middleware; |
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use Psr7Middlewares\Middleware; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use ParagonIE\CSPBuilder\CSPBuilder; |
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/** |
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* Middleware to add the Content-Security-Policy header to the responses. |
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*/ |
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class Csp |
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{ |
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/** |
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* @var CSPBuilder |
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*/ |
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private $csp; |
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/** |
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* Set CSPBuilder. |
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* |
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* @param array|null $policies |
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*/ |
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public function __construct(array $policies = null) |
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{ |
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if ($policies === null) { |
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$policies = [ |
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'script-src' => ['self' => true], |
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'object-src' => ['self' => true], |
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'frame-ancestors' => ['self' => true], |
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]; |
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} |
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$this->csp = new CSPBuilder($policies); |
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return $this; |
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} |
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/** |
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* Add a source to our allow whitelist. |
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* |
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* @param string $directive |
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* @param string $path |
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* |
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* @return self |
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*/ |
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public function addSource($directive, $path) |
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{ |
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$this->csp->addSource($directive, $path); |
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return $this; |
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} |
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/** |
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* Add a directive if it doesn't already exist |
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* If it already exists, do nothing. |
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* |
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* @param string $directive |
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* @param mixed $value |
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* |
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* @return self |
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*/ |
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public function addDirective($directive, $value) |
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{ |
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$this->csp->addDirective($directive, $value); |
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return $this; |
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} |
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/** |
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* Whether or not support old browsers (e.g. safari). |
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* |
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* @param bool $support |
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* |
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* @return self |
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*/ |
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public function supportOldBrowsers($support = true) |
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{ |
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if ($support) { |
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$this->csp->enableOldBrowserSupport(); |
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} else { |
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$this->csp->disableOldBrowserSupport(); |
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} |
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return $this; |
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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 $next) |
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{ |
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$this->csp->compile(); |
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$response = $this->csp->injectCSPHeader($response); |
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return $next($request, $response); |
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} |
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} |
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oscarotero /
psr7-middlewares
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