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<?php |
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namespace ZendSentry\Http\Header; |
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/** |
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* Content Security Policy Header |
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* |
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* @link http://www.w3.org/TR/CSP/ |
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*/ |
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class ContentSecurityPolicy extends \Zend\Http\Header\ContentSecurityPolicy |
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{ |
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public const KEY_CSP = 'csp'; |
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public const DIRECTIVE_DEFAULT_SRC = 'default-src'; |
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public const DIRECTIVE_SCRIPT_SRC = 'script-src'; |
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public const DIRECTIVE_STYLE_SRC = 'style-src'; |
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public const DIRECTIVE_FONT_SRC = 'font-src'; |
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public const DIRECTIVE_IMG_SRC = 'img-src'; |
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public const DIRECTIVE_FRAME_ANCESTORS = 'frame-ancestors'; |
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public const DIRECTIVE_BASE_URI = 'base-uri'; |
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public const DIRECTIVE_FORM_ACTION = 'form-action'; |
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public const DIRECTIVE_CONNECT_SRC = 'connect-src'; |
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public const DIRECTIVE_REPORT_URI = 'report-uri'; |
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public const SOURCE_ALL = '*'; |
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public const SOURCE_SELF = "'self'"; |
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public const SOURCE_DATA = 'data:'; |
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// These UNSAFE directives should be avoided |
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public const SOURCE_UNSAFE_INLINE = "'unsafe-inline'"; |
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public const SOURCE_UNSAFE_EVAL = "'unsafe-eval'"; |
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/** |
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* @var string |
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*/ |
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private static $nonce; |
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/** |
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* ContentSecurityPolicy constructor.* |
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*/ |
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public function __construct() |
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{ |
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$this->init(); |
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} |
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/** |
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* Returns a new nonce for each request. |
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* |
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* @return string |
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*/ |
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public static function getNonce(): string |
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{ |
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if (self::$nonce === null) { |
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self::$nonce = base64_encode(random_bytes(20)); |
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} |
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return self::$nonce; |
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} |
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/** |
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* Set the needed CSP directives for ZendSentry |
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*/ |
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public function init(): void |
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{ |
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$csp = [ |
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self::DIRECTIVE_SCRIPT_SRC => [ |
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'cdn.ravenjs.com', |
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sprintf("'nonce-%s'", self::getNonce()), |
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] |
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]; |
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foreach ($csp as $directive => $sources) { |
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$this->setDirective($directive, $sources); |
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} |
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} |
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} |
cloud-solutions /
zend-sentry
