| 1 |
<?php |
| 2 |
|
| 3 |
namespace Elementor\Modules\Mcp\Preview; |
| 4 |
|
| 5 |
if ( ! defined( 'ABSPATH' ) ) { |
| 6 |
exit; |
| 7 |
} |
| 8 |
|
| 9 |
class Preview_Token { |
| 10 |
|
| 11 |
const QUERY_ARG = 'elementor_preview_token'; |
| 12 |
const SECRET_NAMESPACE = 'elementor_preview_link_v1'; |
| 13 |
|
| 14 |
public static function encode( int $post_id, int $revision_id, int $expires_at, string $secret ): string { |
| 15 |
$payload = self::base64url_encode( wp_json_encode( [ |
| 16 |
'p' => $post_id, |
| 17 |
'r' => $revision_id, |
| 18 |
'e' => $expires_at, |
| 19 |
] ) ); |
| 20 |
|
| 21 |
$signature = self::sign( $payload, $secret ); |
| 22 |
|
| 23 |
return $payload . '.' . $signature; |
| 24 |
} |
| 25 |
|
| 26 |
public static function decode( string $token, string $secret ): ?array { |
| 27 |
$parts = explode( '.', $token ); |
| 28 |
|
| 29 |
if ( count( $parts ) !== 2 ) { |
| 30 |
return null; |
| 31 |
} |
| 32 |
|
| 33 |
[ $payload, $signature ] = $parts; |
| 34 |
|
| 35 |
if ( ! hash_equals( self::sign( $payload, $secret ), $signature ) ) { |
| 36 |
return null; |
| 37 |
} |
| 38 |
|
| 39 |
$decoded = json_decode( self::base64url_decode( $payload ), true ); |
| 40 |
|
| 41 |
if ( ! is_array( $decoded ) || ! isset( $decoded['p'], $decoded['r'], $decoded['e'] ) ) { |
| 42 |
return null; |
| 43 |
} |
| 44 |
|
| 45 |
return [ |
| 46 |
'post_id' => (int) $decoded['p'], |
| 47 |
'revision_id' => (int) $decoded['r'], |
| 48 |
'expires_at' => (int) $decoded['e'], |
| 49 |
]; |
| 50 |
} |
| 51 |
|
| 52 |
public static function is_expired( array $claims, int $now ): bool { |
| 53 |
return $now >= $claims['expires_at']; |
| 54 |
} |
| 55 |
|
| 56 |
public static function secret(): string { |
| 57 |
return wp_salt( 'auth' ) . self::SECRET_NAMESPACE; |
| 58 |
} |
| 59 |
|
| 60 |
private static function sign( string $payload, string $secret ): string { |
| 61 |
return self::base64url_encode( hash_hmac( 'sha256', $payload, $secret, true ) ); |
| 62 |
} |
| 63 |
|
| 64 |
private static function base64url_encode( string $data ): string { |
| 65 |
return rtrim( strtr( base64_encode( $data ), '+/', '-_' ), '=' ); |
| 66 |
} |
| 67 |
|
| 68 |
private static function base64url_decode( string $data ): string { |
| 69 |
$pad = strlen( $data ) % 4; |
| 70 |
|
| 71 |
if ( $pad > 0 ) { |
| 72 |
$data .= str_repeat( '=', 4 - $pad ); |
| 73 |
} |
| 74 |
|
| 75 |
return base64_decode( strtr( $data, '-_', '+/' ) ); |
| 76 |
} |
| 77 |
} |
| 78 |
|
