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<?php |
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/** |
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* CSP |
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* |
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* @author Kenji Suzuki <https://github.com/kenjis> |
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* @license MIT License |
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* @copyright 2014 Kenji Suzuki |
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* @link https://github.com/kenjis/php-csp-nonce-source |
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*/ |
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namespace Kenjis\Csp; |
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/** |
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* CSP |
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* |
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* See http://www.w3.org/TR/CSP2/ |
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*/ |
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class Csp |
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{ |
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/** |
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* @var \Kenjis\Csp\Nonce |
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*/ |
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private $nonce; |
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private $policies = []; |
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private $reportOnly = false; |
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public function __construct(Nonce $nonce) |
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{ |
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$this->nonce = $nonce; |
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} |
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/** |
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* @param string $directive |
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* @param string $value |
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*/ |
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public function addPolicy($directive, $value) |
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{ |
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// with quotation |
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$keywords = ['self', 'unsafe-inline', 'unsafe-eval', 'unsafe-redirect', 'none']; |
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if (in_array($value, $keywords)) { |
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$value = "'" . $value . "'"; |
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} |
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$this->policies[$directive][] = $value; |
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$tmp = array_unique($this->policies[$directive]); |
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$this->policies[$directive] = $tmp; |
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} |
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public function getNonce() |
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{ |
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return $this->nonce->getNonce(); |
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} |
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public function setNonceSource() |
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{ |
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$nonce = $this->nonce->getNonce(); |
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$value = "'" . 'nonce-' . $nonce . "'"; |
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$this->addPolicy('script-src', $value); |
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} |
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public function setReportOnly() |
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{ |
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$this->reportOnly = true; |
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} |
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public function sendHeader() |
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{ |
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$string = (string) $this; |
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if ($string === '') { |
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return; |
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} |
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if (! $this->reportOnly) { |
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$fieldName = 'Content-Security-Policy'; |
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} else { |
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$fieldName = 'Content-Security-Policy-Report-Only'; |
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} |
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// Send CSP header only to browsers which supports nonce-source |
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if ($this->nonce->getNonce() !== Nonce::UNSUPPORTED_BROWSER_NONCE) { |
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header($fieldName . ': ' . $string); |
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} |
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} |
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public function __toString() |
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{ |
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$string = ''; |
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foreach ($this->policies as $directive => $values) { |
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$string .= $directive . ' ' . implode(' ', $values) . '; '; |
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} |
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return rtrim($string, '; '); |
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} |
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} |
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kenjis /
php-csp-nonce-source
