Fix base_asset value in getAggregatePrice (#1467)

Fixes #1372

Author: PeterChen13579

src/rpc/handlers/GetAggregatePrice.hpp

@@ -163,10 +163,12 @@ class GetAggregatePriceHandler {
         static auto const rpcSpec = RpcSpec{
             {JS(ledger_hash), validation::Uint256HexStringValidator},
             {JS(ledger_index), validation::LedgerIndexValidator},
-            // validate quoteAsset in accordance to the currency code found in XRPL doc:
+            // validate quoteAsset and base_asset in accordance to the currency code found in XRPL doc:
             // https://xrpl.org/docs/references/protocol/data-types/currency-formats#currency-codes
             // usually Clio returns rpcMALFORMED_CURRENCY , return InvalidParam here just to mimic rippled
-            {JS(base_asset), validation::Required{}, validation::Type<std::string>{}},
+            {JS(base_asset),
+             validation::Required{},
+             meta::WithCustomError{validation::CurrencyValidator, Status(RippledError::rpcINVALID_PARAMS)}},
             {JS(quote_asset),
              validation::Required{},
              meta::WithCustomError{validation::CurrencyValidator, Status(RippledError::rpcINVALID_PARAMS)}},

tests/unit/rpc/handlers/GetAggregatePriceTests.cpp

@@ -144,6 +144,38 @@ generateTestValuesForParametersTest()
             "invalidParams",
             "Required field 'base_asset' missing"
         },
+        GetAggregatePriceParamTestCaseBundle{
+            "invalid_base_asset",
+            R"({
+                    "quote_asset" : "USD",
+                    "base_asset": "asdf",
+                    "oracles": 
+                    [
+                        {
+                            "account": "rGh1VZCRBJY6rJiaFpD4LZtyHiuCkC8aeD",
+                            "oracle_document_id": 2
+                        }
+                    ]
+                })",
+            "invalidParams",
+            "Invalid parameters."
+        },
+        GetAggregatePriceParamTestCaseBundle{
+            "invalid_base_asset2",
+            R"({
+                    "quote_asset" : "USD",
+                    "base_asset": "+aa",
+                    "oracles": 
+                    [
+                        {
+                            "account": "rGh1VZCRBJY6rJiaFpD4LZtyHiuCkC8aeD",
+                            "oracle_document_id": 2
+                        }
+                    ]
+                })",
+            "invalidParams",
+            "Invalid parameters."
+        },
         GetAggregatePriceParamTestCaseBundle{
             "no_quote_asset",
             R"({