Function parseHeaderPart

fdbrpc/TokenSign.cpp:337–377

}

bool parseHeaderPart(Arena& arena, TokenRef& token, StringRef b64urlHeader) {
	auto tmpArena = Arena();
	auto optHeader = base64url::decode(tmpArena, b64urlHeader);
	if (!optHeader.present())
		return false;
	auto header = optHeader.get();
	auto d = rapidjson::Document();
	d.Parse(reinterpret_cast<const char*>(header.begin()), header.size());
	if (d.HasParseError()) {
		TraceEvent(SevWarnAlways, "TokenHeaderJsonParseError")
		    .suppressFor(10)
		    .detail("Header", header.toString())
		    .detail("Message", GetParseError_En(d.GetParseError()))
		    .detail("Offset", d.GetErrorOffset());
		return false;
	}
	if (!d.IsObject())
		return false;
	auto typItr = d.FindMember("typ");
	if (typItr == d.MemberEnd() || !typItr->value.IsString())
		return false;
	auto algItr = d.FindMember("alg");
	if (algItr == d.MemberEnd() || !algItr->value.IsString())
		return false;
	auto kidItr = d.FindMember("kid");
	if (kidItr == d.MemberEnd() || !kidItr->value.IsString())
		return false;
	auto const& typ = typItr->value;
	auto const& alg = algItr->value;
	auto const& kid = kidItr->value;
	auto typValue = StringRef(reinterpret_cast<const uint8_t*>(typ.GetString()), typ.GetStringLength());
	if (typValue != "JWT"_sr)
		return false;
	auto algValue = StringRef(reinterpret_cast<const uint8_t*>(alg.GetString()), alg.GetStringLength());
	auto algType = algorithmFromString(algValue);
	if (algType == Algorithm::UNKNOWN)
		return false;
	token.algorithm = algType;
	token.keyId = StringRef(arena, reinterpret_cast<const uint8_t*>(kid.GetString()), kid.GetStringLength());
	return true;
}

template <class FieldType>
bool parseField(Arena& arena, Optional<FieldType>& out, const rapidjson::Document& d, const char* fieldName) {