Get hash from base64 xdr transaction

examples/verify-transaction.php

@@ -0,0 +1,43 @@
+<?php
+require '../vendor/autoload.php';
+
+use ZuluCrypto\StellarSdk\Keypair;
+use ZuluCrypto\StellarSdk\XdrModel\TransactionEnvelope;
+use ZuluCrypto\StellarSdk\Xdr\XdrBuffer;
+
+/*
+ * 	Public: GDG3PLZ5EKTMA3DOUGSLSUR7EZ3V3TPL4IBIRK3QYHYFADP5AFS5NW5D
+ *  Secret: SDAP46Z3PXPZLZELRBLRCMS72C23LHHDCGJ2U3D6K5DXUN6A4KARNUNT
+ */
+use \ZuluCrypto\StellarSdk\Server;
+
+
+$xdr = 'AAAAAM23rz0ipsBsbqGkuVI/JnddzeviAoircMHwUA39AWXWAAAAZAAQorIAAAABAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAABAAAAAjQyAAAAAAABAAAAAAAAAAoAAAADZm9vAAAAAAEAAAADYmFyAAAAAAAAAAAB/QFl1gAAAED+nsTh3lM19FR3TBPqvswrcM7fM3mBj29fKVPKIdBhMR3SI0sbJiUVNcWwdGv5IveKOKsNYAnOdjRk9dJ8ebYC';
+//$supposedSignersPublicKey = 'GBJPAGO7O4XKVZNBNKDPFPDRT47PHFA7DG24YZ677VQRZJFKZR7UN53Y';
+$supposedSignersPublicKey = 'GDG3PLZ5EKTMA3DOUGSLSUR7EZ3V3TPL4IBIRK3QYHYFADP5AFS5NW5D';
+
+$server = Server::testNet();
+
+echo 'This transaction was ';
+if (wasSignedBy($xdr, $supposedSignersPublicKey, $server)) {
+    echo "This transaction was signed by the supposed signer.\n";
+} else {
+    echo "This transaction was not signed by the supposed signer.\n";
+}
+
+
+function wasSignedBy($xdr, $publicKey, $server) {
+
+    $supposedSigner = Keypair::newFromPublicKey($publicKey);
+    $envelope = TransactionEnvelope::fromXdr(new XdrBuffer(base64_decode($xdr)), $server);
+    $hash = $envelope->getHash();
+
+    foreach ($envelope->getDecoratedSignatures() as $signature) {
+        if ($supposedSigner->verifySignature( $signature->getRawSignature(), $hash)) {
+            return true;
+        }
+    }
+
+    return false;
+}
+

src/XdrModel/TransactionEnvelope.php

@@ -54,9 +54,9 @@ public function toXdr()
      * @return TransactionEnvelope
      * @throws \ErrorException
      */
-    public static function fromXdr(XdrBuffer $xdr)
+    public static function fromXdr(XdrBuffer $xdr, Server $server = null)
     {
-        $builder = Transaction::fromXdr($xdr)->toTransactionBuilder();
+        $builder = Transaction::fromXdr($xdr)->toTransactionBuilder($server);
 
         $model = new TransactionEnvelope($builder);