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File Content: `JsonWebToken.php`

<?php

namespace Automattic\WooCommerce\StoreApi\Utilities;

/**
 * JsonWebToken class.
 *
 * Simple Json Web Token generator & verifier static utility class, currently supporting only HS256 signatures.
 */
final class JsonWebToken {

	/**
	 * JWT header type.
	 *
	 * @var string
	 */
	private static $type = 'JWT';

	/**
	 * JWT algorithm to generate signature.
	 *
	 * @var string
	 */
	private static $algorithm = 'HS256';

	/**
	 * Generates a token from provided data and secret.
	 *
	 * @param array  $payload Payload data.
	 * @param string $secret The secret used to generate the signature.
	 *
	 * @return string
	 */
	public static function create( array $payload, string $secret ) {
		$header    = self::to_base_64_url( self::generate_header() );
		$payload   = self::to_base_64_url( self::generate_payload( $payload ) );
		$signature = self::to_base_64_url( self::generate_signature( $header . '.' . $payload, $secret ) );

		return $header . '.' . $payload . '.' . $signature;
	}

	/**
	 * Validates a provided token against the provided secret.
	 * Checks for format, valid header for our class, expiration claim validity and signature.
	 * https://datatracker.ietf.org/doc/html/rfc7519#section-7.2
	 *
	 * @param string $token Full token string.
	 * @param string $secret The secret used to generate the signature.
	 *
	 * @return bool
	 */
	public static function validate( string $token, string $secret ) {
		if ( ! self::shallow_validate( $token ) ) {
			return false;
		}

		$parts = self::get_parts( $token );

		/**
		 * Check if the token is based on our secret.
		 */
		$encoded_regenerated_signature = self::to_base_64_url(
			self::generate_signature( $parts->header_encoded . '.' . $parts->payload_encoded, $secret )
		);

		return hash_equals( $encoded_regenerated_signature, $parts->signature_encoded );
	}

	/**
	 * Shallow validate a token, it does not check the signature or expiration, but it checks the structure and expiry.
	 *
	 * @param string $token Full token string.
	 *
	 * @return bool
	 */
	public static function shallow_validate( string $token ) {
		if ( ! $token ) {
			return false;
		}

		/**
		 * Confirm the structure of a JSON Web Token, it has three parts separated
		 * by dots and complies with Base64URL standards.
		 */
		if ( preg_match( '/^[a-zA-Z\d\-_=]+\.[a-zA-Z\d\-_=]+\.[a-zA-Z\d\-_=]+$/', $token ) !== 1 ) {
			return false;
		}

		$parts = self::get_parts( $token );

		/**
		 * Check if header declares a supported JWT by this class.
		 */
		if (
			! is_object( $parts->header ) ||
			! property_exists( $parts->header, 'typ' ) ||
			! property_exists( $parts->header, 'alg' ) ||
			self::$type !== $parts->header->typ ||
			self::$algorithm !== $parts->header->alg
		) {
			return false;
		}

		/**
		 * Check if token is expired.
		 */
		if ( ! property_exists( $parts->payload, 'exp' ) || time() > (int) $parts->payload->exp ) {
			return false;
		}

		return true;
	}

	/**
	 * Returns the decoded/encoded header, payload and signature from a token string.
	 *
	 * @param string $token Full token string.
	 *
	 * @return object
	 */
	public static function get_parts( string $token ) {
		$parts = explode( '.', $token );

		return (object) array(
			'header'            => json_decode( self::from_base_64_url( $parts[0] ) ),
			'header_encoded'    => $parts[0],
			'payload'           => json_decode( self::from_base_64_url( $parts[1] ) ),
			'payload_encoded'   => $parts[1],
			'signature'         => self::from_base_64_url( $parts[2] ),
			'signature_encoded' => $parts[2],

		);
	}

	/**
	 * Generates the json formatted header for our HS256 JWT token.
	 *
	 * @return string|bool
	 */
	private static function generate_header() {
		return wp_json_encode(
			array(
				'alg' => self::$algorithm,
				'typ' => self::$type,
			)
		);
	}

	/**
	 * Generates a sha256 signature for the provided string using the provided secret.
	 *
	 * @param string $string Header + Payload token substring.
	 * @param string $secret The secret used to generate the signature.
	 *
	 * @return false|string
	 */
	private static function generate_signature( string $string, string $secret ) {
		return hash_hmac(
			'sha256',
			$string,
			$secret,
			true
		);
	}

	/**
	 * Generates the payload in json formatted string.
	 *
	 * @param array $payload Payload data.
	 *
	 * @return string|bool
	 */
	private static function generate_payload( array $payload ) {
		return wp_json_encode( array_merge( $payload, [ 'iat' => time() ] ) );
	}

	/**
	 * Encodes a string to url safe base64.
	 *
	 * @param string $string The string to be encoded.
	 *
	 * @return string
	 */
	private static function to_base_64_url( string $string ) {
		return str_replace(
			array( '+', '/', '=' ),
			array( '-', '_', '' ),
			base64_encode( $string ) // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode
		);
	}

	/**
	 * Decodes a string encoded using url safe base64, supporting auto padding.
	 *
	 * @param string $string the string to be decoded.
	 *
	 * @return string
	 */
	private static function from_base_64_url( string $string ) {
		/**
		 * Add padding to base64 strings which require it. Some base64 URL strings
		 * which are decoded will have missing padding which is represented by the
		 * equals sign.
		 */
		if ( strlen( $string ) % 4 !== 0 ) {
			return self::from_base_64_url( $string . '=' );
		}

		return base64_decode( // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_decode
			str_replace(
				array( '-', '_' ),
				array( '+', '/' ),
				$string
			)
		);
	}
}

Name	Size	Permission
AgenticCheckoutUtils.php	16846 bytes	0644
ArrayUtils.php	1530 bytes	0644
CartController.php	50102 bytes	0644
CartTokenUtils.php	1853 bytes	0644
CheckoutTrait.php	11076 bytes	0644
DraftOrderTrait.php	1807 bytes	0644
JsonWebToken.php	5576 bytes	0644
LocalPickupUtils.php	5801 bytes	0644
NoticeHandler.php	2070 bytes	0644
OrderAuthorizationTrait.php	3367 bytes	0644
OrderController.php	32457 bytes	0644
Pagination.php	2100 bytes	0644
PaymentUtils.php	3737 bytes	0644
ProductItemTrait.php	3115 bytes	0644
ProductQuery.php	19715 bytes	0644
ProductQueryFilters.php	9469 bytes	0644
QuantityLimits.php	10354 bytes	0644
RateLimits.php	6289 bytes	0644
SanitizationUtils.php	794 bytes	0644
ValidationUtils.php	1770 bytes	0644

File Content: JsonWebToken.php

File Content: `JsonWebToken.php`