Support spending wallets with multiple UTXOs

www/assets/js/crypto.js

@@ -41,15 +41,33 @@ function scanPrivateKeyQrCode(callback) {
  * @param {type} privateKeyString Private key from wallet QR code
  * @param {type} sourceAddress Sender's wallet address
  * @param {type} destinationAddress Recipient's wallet address
+ * @param {Array} utxos Unspent transaction inputs, as array. See createUtxo()
+ * @param {type} outputSatoshis Amount to send to recipient's wallet
+ * @returns {string} Hex of serialized transaction, suitable for broadcast via Bitcoin Core or an API.
+ */
+function createSignedTransaction(bitcoreLib, privateKeyString, sourceAddress, destinationAddress, utxos, outputSatoshis) {
+    var privateKey = new bitcoreLib.PrivateKey(privateKeyString);
+
+    var transaction = new bitcoreLib.Transaction()
+            .from(utxos)
+            .to(destinationAddress, outputSatoshis)
+            .change(sourceAddress)
+            .sign(privateKey);
+
+    return transaction.serialize();
+}
+
+/**
+ * Create a UTXO.
+ *
+ * @param {type} sourceAddress Sender's wallet address
  * @param {type} txHash From UXTO (unspent output)
  * @param {type} txOutputIndex From UXTO (unspent output)
  * @param {type} script From UXTO (unspent output)
  * @param {type} inputSatoshis From UXTO (unspent output)
- * @param {type} outputSatoshis Amount to send to recipient's wallet
- * @returns {string} Hex of serialized transaction, suitable for broadcast via Bitcoin Core or an API.
+ * @returns {createUtxo.utxo}
  */
-function createSignedTransaction(bitcoreLib, privateKeyString, sourceAddress, destinationAddress, txHash, txOutputIndex, script, inputSatoshis, outputSatoshis) {
-    var privateKey = new bitcoreLib.PrivateKey(privateKeyString);
+function createUtxo(sourceAddress, txHash, txOutputIndex, script, inputSatoshis) {
     var utxo = {
         "txId": txHash,
         "outputIndex": txOutputIndex,
@@ -57,14 +75,7 @@ function createSignedTransaction(bitcoreLib, privateKeyString, sourceAddress, de
         "script": script,
         "satoshis": inputSatoshis
     };
-
-    var transaction = new bitcoreLib.Transaction()
-            .from(utxo)
-            .to(destinationAddress, outputSatoshis)
-            .change(sourceAddress)
-            .sign(privateKey);
-
-    return transaction.serialize();
+    return utxo;
 }
 
 /**
@@ -113,10 +124,10 @@ function sendCoins(privatekey, fromaddress, toaddress, amount) {
             app.dialog.close();
             app.dialog.alert("Your wallet has no available funds (ZERO_LENGTH_UXTO).", "Error");
             return;
-        } else if (success.uxtos.length > 1) {
-            app.dialog.close();
-            app.dialog.alert("For technical reasons, your wallet isn't compatible with this app right now. You can still sweep this wallet into an alternative app to spend it. (MULTIPLE_UXTO)", "Error");
-            return;
+        }
+        var utxos = [];
+        for (var i = 0; i < success.utxos.length; i++) {
+            utxos.push(createUtxo(fromaddress, success.utxos[i].txHash, success.utxos[i].txOutputIndex, success.utxos[i].script, success.utxos[i].value));
         }
         var bitcore = null;
         var satoshis = amount * 100000000;
@@ -132,9 +143,7 @@ function sendCoins(privatekey, fromaddress, toaddress, amount) {
                 app.dialog.alert("This app version doesn't support " + success.currency + ".", "Error");
                 return;
         }
-        var txdata = createSignedTransaction(bitcore, privatekey, fromaddress, toaddress,
-                success.uxtos[0].txHash, success.uxtos[0].txOutputIndex, success.uxtos[0].script,
-                success.uxtos[0].value, satoshis);
+        var txdata = createSignedTransaction(bitcore, privatekey, fromaddress, toaddress, utxos, satoshis);
 
         progressdialog.setProgress(75);
         progressdialog.setText("Sending payment...");