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<?php |
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namespace WPEmerge\Csrf; |
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use WPEmerge\Requests\Request; |
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/** |
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* Provide CSRF protection utilities through WordPress nonces. |
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*/ |
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class Csrf { |
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/** |
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* Convenience header to check for the token. |
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* |
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* @var string |
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*/ |
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protected $header = 'X-CSRF-TOKEN'; |
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/** |
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* GET/POST parameter key to check for the token. |
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* |
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* @var string |
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*/ |
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protected $key = ''; |
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/** |
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* Maximum token lifetime. |
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* |
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* @see https://codex.wordpress.org/Function_Reference/wp_verify_nonce |
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* @var integer |
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*/ |
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protected $maximum_lifetime = 2; |
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/** |
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* Last generated token. |
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* |
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* @var string |
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*/ |
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protected $token = ''; |
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/** |
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* Constructor. |
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* |
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* @codeCoverageIgnore |
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* @param string $key |
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* @param integer $maximum_lifetime |
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*/ |
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public function __construct( $key = '__wpemergeCsrfToken', $maximum_lifetime = 2 ) { |
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$this->key = $key; |
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$this->maximum_lifetime = $maximum_lifetime; |
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} |
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/** |
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* Get the last generated token. |
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* |
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* @return string |
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*/ |
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public function getToken() { |
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if ( ! $this->token ) { |
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$this->generateToken(); |
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} |
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return $this->token; |
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} |
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/** |
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* Get the csrf token from a request. |
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* |
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* @param Request $request |
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* @return string |
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*/ |
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public function getTokenFromRequest( Request $request ) { |
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if ( $request->get( $this->key ) ) { |
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return $request->get( $this->key ); |
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} |
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if ( $request->post( $this->key ) ) { |
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return $request->post( $this->key ); |
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} |
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if ( $request->headers( $this->header ) ) { |
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return $request->headers( $this->header ); |
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} |
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return ''; |
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} |
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/** |
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* Generate a new token. |
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* |
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* @param int|string $action |
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* @return string |
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*/ |
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public function generateToken( $action = -1 ) { |
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$action = $action === -1 ? session_id() : $action; |
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$this->token = wp_create_nonce( $action ); |
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return $this->getToken(); |
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} |
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/** |
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* Check if a token is valid. |
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* |
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* @param string $token |
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* @param int|string $action |
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* @return boolean |
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*/ |
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public function isValidToken( $token, $action = -1 ) { |
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$action = $action === -1 ? session_id() : $action; |
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$lifetime = intval( wp_verify_nonce( $token, $action ) ); |
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return ( $lifetime > 0 && $lifetime <= $this->maximum_lifetime ); |
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} |
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/** |
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* Add the token to a URL. |
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* |
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* @param string $url |
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* @return string |
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*/ |
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public function url( $url ) { |
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return add_query_arg( $this->key, $this->getToken(), $url ); |
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} |
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/** |
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* Return the markup for a hidden input which holds the current token. |
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* |
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* @return void |
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*/ |
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public function field() { |
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echo '<input type="hidden" name="' . esc_attr( $this->key ) . '" value="' . esc_attr( $this->getToken() ) . '" />'; |
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} |
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} |
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htmlburger /
wpemerge
