Merge bitcoin/bitcoin#26039: refactor: Run type check against RPCArgs (1/2)

fa9f6d7bcd rpc: Run type check against RPCArgs (MarcoFalke)
faf96721a6 test: Fix wrong types passed to RPCs (MarcoFalke)

Pull request description:

  It seems brittle to require `RPCTypeCheck` being called inside the code logic. Without compile-time enforcement this will lead to places where it is forgotten and thus to inconsistencies and bugs. Fix this by removing the calls to `RPCTypeCheck` and doing the check internally.

  The changes should be reviewed as refactoring changes. However, if they change behavior, it will be a bugfix. For example the changes here happen to also detect/fix bugs like the one fixed in commit 3b5fb6e77a.

ACKs for top commit:
  ajtowns:
    ACK fa9f6d7bcd

Tree-SHA512: fb2c0981fe6e24da3ca7dbc06898730779ea4e02ea485458505a281cf421015e44dad0221a04023fc547ea2c660d94657909843fc85d92b847611ec097532439

src/wallet/rpc/spend.cpp

@@ -317,7 +317,11 @@ RPCHelpMan sendmany()
                 "\nSend multiple times. Amounts are double-precision floating point numbers." +
         HELP_REQUIRING_PASSPHRASE,
                 {
-                    {"dummy", RPCArg::Type::STR, RPCArg::Optional::NO, "Must be set to \"\" for backwards compatibility.", RPCArgOptions{.oneline_description="\"\""}},
+                    {"dummy", RPCArg::Type::STR, RPCArg::Optional::NO, "Must be set to \"\" for backwards compatibility.",
+                     RPCArgOptions{
+                         .skip_type_check = true,
+                         .oneline_description = "\"\"",
+                     }},
                     {"amounts", RPCArg::Type::OBJ_USER_KEYS, RPCArg::Optional::NO, "The addresses and amounts",
                         {
                             {"address", RPCArg::Type::AMOUNT, RPCArg::Optional::NO, "The bitcoin address is the key, the numeric amount (can be string) in " + CURRENCY_UNIT + " is the value"},
@@ -798,7 +802,10 @@ RPCHelpMan fundrawtransaction()
                              },
                         },
                         FundTxDoc()),
-                        RPCArgOptions{.oneline_description="options"}},
+                        RPCArgOptions{
+                            .skip_type_check = true,
+                            .oneline_description = "options",
+                        }},
                     {"iswitness", RPCArg::Type::BOOL, RPCArg::DefaultHint{"depends on heuristic tests"}, "Whether the transaction hex is a serialized witness transaction.\n"
                         "If iswitness is not present, heuristic tests will be used in decoding.\n"
                         "If true, only witness deserialization will be tried.\n"
@@ -830,8 +837,6 @@ RPCHelpMan fundrawtransaction()
     std::shared_ptr<CWallet> const pwallet = GetWalletForJSONRPCRequest(request);
     if (!pwallet) return UniValue::VNULL;
 
-    RPCTypeCheck(request.params, {UniValue::VSTR, UniValueType(), UniValue::VBOOL});
-
     // parse hex string from parameter
     CMutableTransaction tx;
     bool try_witness = request.params[2].isNull() ? true : request.params[2].get_bool();
@@ -920,8 +925,6 @@ RPCHelpMan signrawtransactionwithwallet()
     const std::shared_ptr<const CWallet> pwallet = GetWalletForJSONRPCRequest(request);
     if (!pwallet) return UniValue::VNULL;
 
-    RPCTypeCheck(request.params, {UniValue::VSTR, UniValue::VARR, UniValue::VSTR}, true);
-
     CMutableTransaction mtx;
     if (!DecodeHexTx(mtx, request.params[0].get_str())) {
         throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "TX decode failed. Make sure the tx has at least one input.");
@@ -1021,7 +1024,6 @@ static RPCHelpMan bumpfee_helper(std::string method_name)
         throw JSONRPCError(RPC_WALLET_ERROR, "bumpfee is not available with wallets that have private keys disabled. Use psbtbumpfee instead.");
     }
 
-    RPCTypeCheck(request.params, {UniValue::VSTR, UniValue::VOBJ});
     uint256 hash(ParseHashV(request.params[0], "txid"));
 
     CCoinControl coin_control;
@@ -1155,7 +1157,7 @@ RPCHelpMan send()
                         },
                     },
                 },
-            },
+                RPCArgOptions{.skip_type_check = true}},
             {"conf_target", RPCArg::Type::NUM, RPCArg::DefaultHint{"wallet -txconfirmtarget"}, "Confirmation target in blocks"},
             {"estimate_mode", RPCArg::Type::STR, RPCArg::Default{"unset"}, "The fee estimate mode, must be one of (case insensitive):\n"
              "\"" + FeeModes("\"\n\"") + "\""},
@@ -1227,15 +1229,6 @@ RPCHelpMan send()
         },
         [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
         {
-            RPCTypeCheck(request.params, {
-                UniValueType(), // outputs (ARR or OBJ, checked later)
-                UniValue::VNUM, // conf_target
-                UniValue::VSTR, // estimate_mode
-                UniValueType(), // fee_rate, will be checked by AmountFromValue() in SetFeeEstimateMode()
-                UniValue::VOBJ, // options
-                }, true
-            );
-
             std::shared_ptr<CWallet> const pwallet = GetWalletForJSONRPCRequest(request);
             if (!pwallet) return UniValue::VNULL;
 
@@ -1338,15 +1331,6 @@ RPCHelpMan sendall()
         },
         [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
         {
-            RPCTypeCheck(request.params, {
-                UniValue::VARR, // recipients
-                UniValue::VNUM, // conf_target
-                UniValue::VSTR, // estimate_mode
-                UniValueType(), // fee_rate, will be checked by AmountFromValue() in SetFeeEstimateMode()
-                UniValue::VOBJ, // options
-                }, true
-            );
-
             std::shared_ptr<CWallet> const pwallet{GetWalletForJSONRPCRequest(request)};
             if (!pwallet) return UniValue::VNULL;
             // Make sure the results are valid at least up to the most recent block
@@ -1561,8 +1545,6 @@ RPCHelpMan walletprocesspsbt()
     // the user could have gotten from another RPC command prior to now
     wallet.BlockUntilSyncedToCurrentChain();
 
-    RPCTypeCheck(request.params, {UniValue::VSTR});
-
     // Unserialize the transaction
     PartiallySignedTransaction psbtx;
     std::string error;
@@ -1637,7 +1619,7 @@ RPCHelpMan walletcreatefundedpsbt()
                                 },
                             },
                         },
-                    },
+                     RPCArgOptions{.skip_type_check = true}},
                     {"locktime", RPCArg::Type::NUM, RPCArg::Default{0}, "Raw locktime. Non-0 value also locktime-activates inputs"},
                     {"options", RPCArg::Type::OBJ, RPCArg::Optional::OMITTED_NAMED_ARG, "",
                         Cat<std::vector<RPCArg>>(
@@ -1690,15 +1672,6 @@ RPCHelpMan walletcreatefundedpsbt()
     // the user could have gotten from another RPC command prior to now
     wallet.BlockUntilSyncedToCurrentChain();
 
-    RPCTypeCheck(request.params, {
-        UniValue::VARR,
-        UniValueType(), // ARR or OBJ, checked later
-        UniValue::VNUM,
-        UniValue::VOBJ,
-        UniValue::VBOOL
-        }, true
-    );
-
     UniValue options{request.params[3].isNull() ? UniValue::VOBJ : request.params[3]};
 
     CAmount fee;