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rpc: Add check for unintended option/parameter name clashes

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Also add flag to allow RPC methods that intendionally accept options and
parameters with the same name bypass the check.

Check and flag were suggested by ajtowns
https://github.com/bitcoin/bitcoin/pull/26485#issuecomment-1507916357

Co-authored-by: Anthony Towns <aj@erisian.com.au>
This commit is contained in:
Ryan Ofsky 2023-04-19 15:02:38 -04:00
parent 95d7de0964
commit 2cd28e9fef
4 changed files with 82 additions and 6 deletions
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24
src/rpc/util.cpp
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@ -486,12 +486,32 @@ RPCHelpMan::RPCHelpMan(std::string name, std::string description, std::vector<RP
m_results{std::move(results)},
m_examples{std::move(examples)}
{
std::set<std::string> named_args;
// Map of parameter names and types just used to check whether the names are
// unique. Parameter names always need to be unique, with the exception that
// there can be pairs of POSITIONAL and NAMED parameters with the same name.
enum ParamType { POSITIONAL = 1, NAMED = 2, NAMED_ONLY = 4 };
std::map<std::string, int> param_names;
for (const auto& arg : m_args) {
std::vector<std::string> names = SplitString(arg.m_names, '|');
// Should have unique named arguments
for (const std::string& name : names) {
CHECK_NONFATAL(named_args.insert(name).second);
auto& param_type = param_names[name];
CHECK_NONFATAL(!(param_type & POSITIONAL));
CHECK_NONFATAL(!(param_type & NAMED_ONLY));
param_type |= POSITIONAL;
}
if (arg.m_type == RPCArg::Type::OBJ_NAMED_PARAMS) {
for (const auto& inner : arg.m_inner) {
std::vector<std::string> inner_names = SplitString(inner.m_names, '|');
for (const std::string& inner_name : inner_names) {
auto& param_type = param_names[inner_name];
CHECK_NONFATAL(!(param_type & POSITIONAL) || inner.m_opts.also_positional);
CHECK_NONFATAL(!(param_type & NAMED));
CHECK_NONFATAL(!(param_type & NAMED_ONLY));
param_type |= inner.m_opts.also_positional ? NAMED : NAMED_ONLY;
}
}
}
// Default value type should match argument type only when defined
if (arg.m_fallback.index() == 2) {