Implemented z_listaddresses to return all the zaddr in the wallet.

src/wallet/rpcwallet.cpp

@@ -2795,3 +2795,35 @@ Value z_getnewaddress(const Array& params, bool fHelp)
     return result;
 }
 
+
+Value z_listaddresses(const Array& params, bool fHelp)
+{
+    if (!EnsureWalletIsAvailable(fHelp))
+        return Value::null;
+
+    if (fHelp || params.size() > 1)
+        throw runtime_error(
+            "z_listaddresses\n"
+            "\nReturns the list of zaddr belonging to the wallet.\n"
+            "\nArguments:\n"
+            "\nResult:\n"
+            "[                     (json array of string)\n"
+            "  \"zaddr\"           (string) a zaddr belonging to the wallet\n"
+            "  ,...\n"
+            "]\n"
+            "\nExamples:\n"
+            + HelpExampleCli("z_listaddresses", "")
+            + HelpExampleRpc("z_listaddresses", "")
+        );
+
+    LOCK2(cs_main, pwalletMain->cs_wallet);
+
+    Array ret;
+    std::set<libzcash::PaymentAddress> addresses;
+    pwalletMain->GetPaymentAddresses(addresses);
+    for (auto addr : addresses ) {
+        ret.push_back(CZCPaymentAddress(addr).ToString());
+    }
+    return ret;
+}
+