Walletconnect signtransactions fix

CHANGELOG.md

@@ -8,6 +8,7 @@ Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how
 
 ## [7.0.1]
 - [Bugfix for Safari - removed negative lookbehind regex #67](https://github.com/ElrondNetwork/elrond-sdk-erdjs/pull/67)
+- [Bugfix on WalletConnect signTransactions single Tx case #69](https://github.com/ElrondNetwork/elrond-sdk-erdjs/pull/69)
 
 ## [7.0.0]
 - [Contract wrapper](https://github.com/ElrondNetwork/elrond-sdk-erdjs/pull/9)

src/dapp/walletConnectProvider.ts

@@ -182,18 +182,30 @@ export class WalletConnectProvider implements IDappProvider {
 
         const address = await this.getAddress();
         const params = transactions.map((transaction) => this.prepareWalletConnectMessage(transaction, address));
-        const signatures = await this.walletConnector.sendCustomRequest({
+        const signatures: { signature: string }[] | { signature: string } = await this.walletConnector.sendCustomRequest({
             method: "erd_batch_sign",
             params
         });
-        if (!signatures || (transactions.length !== signatures.length)) {
+        if (!signatures) {
             Logger.error("signTransactions: Wallet Connect could not sign the transactions");
             throw new Error("Wallet Connect could not sign the transactions");
         }
-        transactions.map((transaction, key: number) => 
-            transaction.applySignature(new Signature(signatures[key].signature), new Address(address))
-        );
 
+        if (Array.isArray(signatures)) {
+            if (transactions.length !== signatures.length) {
+                Logger.error("signTransactions: Wallet Connect could not sign the transactions. Invalid signatures.");
+                throw new Error("Wallet Connect could not sign the transactions. Invalid signatures.");
+            }
+
+            transactions.map((transaction, key: number) => 
+                transaction.applySignature(new Signature(signatures[key].signature), new Address(address))
+            );
+
+            return transactions;
+        }
+
+        transactions[0].applySignature(new Signature(signatures.signature), new Address(address));
+
         return transactions;
     }