Fix empty currency (#1481)

Author: cindyyan317

src/rpc/common/Validators.cpp

@@ -29,6 +29,7 @@
 #include <fmt/core.h>
 #include <ripple/basics/base_uint.h>
 #include <ripple/protocol/AccountID.h>
+#include <ripple/protocol/ErrorCodes.h>
 #include <ripple/protocol/UintTypes.h>
 #include <ripple/protocol/tokens.h>
 
@@ -140,8 +141,12 @@ CustomValidator CurrencyValidator =
         if (!value.is_string())
             return Error{Status{RippledError::rpcINVALID_PARAMS, std::string(key) + "NotString"}};
 
+        auto const currencyStr = boost::json::value_to<std::string>(value);
+        if (currencyStr.empty())
+            return Error{Status{RippledError::rpcINVALID_PARAMS, std::string(key) + "IsEmpty"}};
+
         ripple::Currency currency;
-        if (!ripple::to_currency(currency, boost::json::value_to<std::string>(value)))
+        if (!ripple::to_currency(currency, currencyStr))
             return Error{Status{ClioError::rpcMALFORMED_CURRENCY, "malformedCurrency"}};
 
         return MaybeError{};

tests/unit/rpc/handlers/GetAggregatePriceTests.cpp

@@ -160,6 +160,22 @@ generateTestValuesForParametersTest()
             "invalidParams",
             "Invalid parameters."
         },
+        GetAggregatePriceParamTestCaseBundle{
+            "emtpy_base_asset",
+            R"({
+                    "quote_asset" : "USD",
+                    "base_asset": "",
+                    "oracles": 
+                    [
+                        {
+                            "account": "rGh1VZCRBJY6rJiaFpD4LZtyHiuCkC8aeD",
+                            "oracle_document_id": 2
+                        }
+                    ]
+                })",
+            "invalidParams",
+            "Invalid parameters."
+        },
         GetAggregatePriceParamTestCaseBundle{
             "invalid_base_asset2",
             R"({
@@ -207,6 +223,22 @@ generateTestValuesForParametersTest()
             "invalidParams",
             "Invalid parameters."
         },
+        GetAggregatePriceParamTestCaseBundle{
+            "empty_quote_asset",
+            R"({
+                    "quote_asset" : "",
+                    "base_asset": "USD",
+                    "oracles": 
+                    [
+                        {
+                            "account": "rGh1VZCRBJY6rJiaFpD4LZtyHiuCkC8aeD",
+                            "oracle_document_id": 2
+                        }
+                    ]
+                })",
+            "invalidParams",
+            "Invalid parameters."
+        },
         GetAggregatePriceParamTestCaseBundle{
             "invalid_quote_asset2",
             R"({