Merge branch 'task/g112_sign_with_cosignatories' of github.com:rg911/nem2-sdk-typescript-javascript into task/g112_sign_with_cosignatories

Author: rg911

src/model/transaction/AggregateTransaction.ts

@@ -161,6 +161,23 @@ export class AggregateTransaction extends Transaction {
                                      this.type, this.networkType);
     }
 
+    /**
+     * @internal
+     * Sign transaction with cosignatories collected from cosigned transactions and creating a new SignedTransaction
+     * For off chain Aggregated Complete Transaction co-signing.
+     * @param initiatorAccount - Initiator account
+     * @param {CosignatureSignedTransaction[]} cosignatureSignedTransactions - Array of cosigned transaction
+     * @return {SignedTransaction}
+     */
+    public signTransactionGivenSignatures(initiatorAccount: Account,
+                                          cosignatureSignedTransactions: CosignatureSignedTransaction[]) {
+        const aggregateTransaction = this.buildTransaction();
+        const signedTransactionRaw = aggregateTransaction.signTransactionGivenSignatures(initiatorAccount,
+                                                                                         cosignatureSignedTransactions);
+        return new SignedTransaction(signedTransactionRaw.payload, signedTransactionRaw.hash, initiatorAccount.publicKey,
+                                     this.type, this.networkType);
+    }
+
     /**
      * Check if account has signed transaction
      * @param publicAccount - Signer public account