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WebhooksMiddleware.php
112 lines
| 1 | <?php |
| 2 | |
| 3 | namespace SureCart\Middleware; |
| 4 | |
| 5 | use Closure; |
| 6 | use SureCart\Models\RegisteredWebhook; |
| 7 | use SureCartCore\Requests\RequestInterface; |
| 8 | |
| 9 | /** |
| 10 | * Middleware for handling model archiving. |
| 11 | */ |
| 12 | class WebhooksMiddleware { |
| 13 | /** |
| 14 | * Holds the current request. |
| 15 | * |
| 16 | * @var RequestInterface |
| 17 | */ |
| 18 | protected $request; |
| 19 | |
| 20 | /** |
| 21 | * Handle the middleware. |
| 22 | * |
| 23 | * @param RequestInterface $request Request. |
| 24 | * @param Closure $next Next. |
| 25 | * @return function |
| 26 | */ |
| 27 | public function handle( RequestInterface $request, Closure $next ) { |
| 28 | $this->request = $request; |
| 29 | |
| 30 | if ( ! $this->verifySignature( $request ) ) { |
| 31 | return \SureCart::json( [ 'error' => 'Invalid signature' ] )->withStatus( 403 ); |
| 32 | } |
| 33 | |
| 34 | return $next( $request ); |
| 35 | } |
| 36 | |
| 37 | /** |
| 38 | * Verify the signature. |
| 39 | * |
| 40 | * Fails closed when no signing secret is registered — see CVE-2026-7655. |
| 41 | * Uses hash_equals() for a timing-safe comparison. |
| 42 | * |
| 43 | * @return bool |
| 44 | */ |
| 45 | public function verifySignature() { |
| 46 | $secret = $this->getSigningSecret(); |
| 47 | if ( ! is_string( $secret ) || '' === $secret ) { |
| 48 | return false; |
| 49 | } |
| 50 | return hash_equals( (string) $this->computeHash( $secret ), (string) $this->getSignature() ); |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * Compute an HMAC with the SHA256 hash function. |
| 55 | * Use the endpoint’s signing secret as the key, and use the signed_payload string as the message. |
| 56 | * |
| 57 | * @param string|null $secret Optional signing secret. Falls back to getSigningSecret() when null. |
| 58 | * @return string |
| 59 | */ |
| 60 | public function computeHash( $secret = null ) { |
| 61 | if ( null === $secret ) { |
| 62 | $secret = $this->getSigningSecret(); |
| 63 | } |
| 64 | return hash_hmac( 'sha256', $this->getSignedPayload(), (string) $secret ); |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * Get the signing secret. |
| 69 | * |
| 70 | * @return string |
| 71 | */ |
| 72 | public function getSigningSecret() { |
| 73 | return RegisteredWebhook::getSigningSecret(); |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Get expected json request body. |
| 78 | * |
| 79 | * @return string |
| 80 | */ |
| 81 | public function getBody() { |
| 82 | return file_get_contents( 'php://input' ); |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * Get the webhook signature. |
| 87 | * |
| 88 | * @return string |
| 89 | */ |
| 90 | public function getSignature() { |
| 91 | return $this->request->headers( 'X-Webhook-Signature' )[0] ?? $this->request->headers( 'x-webhook-signature' )[0] ?? ''; |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * Get the webhook timestamp. |
| 96 | * |
| 97 | * @return string |
| 98 | */ |
| 99 | public function getTimestamp() { |
| 100 | return $this->request->headers( 'X-Webhook-Timestamp' )[0] ?? $this->request->headers( 'x-webhook-timestamp' )[0] ?? ''; |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Get the signed payload. |
| 105 | * |
| 106 | * @return string |
| 107 | */ |
| 108 | public function getSignedPayload() { |
| 109 | return $this->getTimestamp() . '.' . $this->getBody(); |
| 110 | } |
| 111 | } |
| 112 |