Add more JSON helpers

CMakeLists.txt

@@ -360,6 +360,21 @@ else()
 endif()
 target_link_libraries(${LIB_NAME} PUBLIC nlohmann_json::nlohmann_json)
 
+if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/deps/jsoncons/CMakeLists.txt")
+  # Don't build jsoncons unit tests as they are causing compilation issues and
+  # won't be executed either way
+  if(OS_MACOS)
+    cmake_policy(SET CMP0077 NEW)
+  endif()
+  set(JSONCONS_BUILD_TESTS
+      OFF
+      CACHE BOOL "" FORCE)
+
+  add_subdirectory(deps/jsoncons)
+  target_link_libraries(${LIB_NAME} PRIVATE jsoncons)
+  target_compile_definitions(${LIB_NAME} PRIVATE JSONPATH_SUPPORT=1)
+endif()
+
 find_package(CURL QUIET)
 find_package(Libcurl QUIET)
 if(CURL_FOUND)

lib/utils/json-helpers.cpp

@@ -1,5 +1,9 @@
 #include "json-helpers.hpp"
 
+#ifdef JSONPATH_SUPPORT
+#include <jsoncons/json.hpp>
+#include <jsoncons_ext/jsonpath/jsonpath.hpp>
+#endif
 #include <nlohmann/json.hpp>
 #include <QJsonDocument>
 
@@ -57,4 +61,42 @@ std::optional<std::string> GetJsonField(const std::string &jsonStr,
 	return {};
 }
 
+std::optional<std::string> QueryJson(const std::string &jsonStr,
+				     const std::string &query)
+{
+#ifdef JSONPATH_SUPPORT
+	try {
+		auto json = jsoncons::json::parse(jsonStr);
+		auto result = jsoncons::jsonpath::json_query(json, query);
+		return result.as_string();
+	} catch (const jsoncons::json_exception &) {
+		return {};
+	} catch (const jsoncons::json_errc &) {
+		return {};
+	}
+#else
+	return {};
+#endif
+}
+
+std::optional<std::string> AccessJsonArrayIndex(const std::string &jsonStr,
+						const int index)
+{
+	try {
+		nlohmann::json json = nlohmann::json::parse(jsonStr);
+		if (!json.is_array() || index >= (int)json.size() ||
+		    index < 0) {
+			return {};
+		}
+		auto result = json.at(index);
+		if (result.is_string()) {
+			return result.get<std::string>();
+		}
+		return result.dump();
+	} catch (const nlohmann::json::exception &) {
+		return {};
+	}
+	return {};
+}
+
 } // namespace advss

lib/utils/json-helpers.hpp

@@ -13,5 +13,9 @@ EXPORT bool MatchJson(const std::string &json1, const std::string &json2,
 		      const RegexConfig &regex);
 EXPORT std::optional<std::string> GetJsonField(const std::string &json,
 					       const std::string &id);
+EXPORT std::optional<std::string> QueryJson(const std::string &json,
+					    const std::string &query);
+EXPORT std::optional<std::string> AccessJsonArrayIndex(const std::string &json,
+						       const int index);
 
 } // namespace advss