From a440adbef9d723484f49341f778f806de7b87ef1 Mon Sep 17 00:00:00 2001
From: Sukru Senli <sukru.senli@iopsys.eu>
Date: Tue, 17 Jun 2025 15:38:32 +0200
Subject: [PATCH] jsonval: 1.0.0

A small CLI tool to validate JSON files against a schema using json-schema-validator and nlohmann/json
---
 jsonval/Makefile     | 44 ++++++++++++++++++++++++++++++
 jsonval/src/main.cpp | 64 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 108 insertions(+)
 create mode 100644 jsonval/Makefile
 create mode 100644 jsonval/src/main.cpp

diff --git a/jsonval/Makefile b/jsonval/Makefile
new file mode 100644
index 000000000..c2a2001b3
--- /dev/null
+++ b/jsonval/Makefile
@@ -0,0 +1,44 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=jsonval
+PKG_VERSION:=1.0.0
+PKG_RELEASE:=1
+
+PKG_LICENSE:=MIT
+PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/jsonval
+  SECTION:=utils
+  CATEGORY:=Utilities
+  TITLE:=Command-line JSON Schema Validator
+  DEPENDS:=+nlohmann-json +json-schema-validator +libstdcpp
+endef
+
+define Package/jsonval/description
+  A small CLI tool to validate JSON files against a schema using json-schema-validator and nlohmann/json.
+endef
+
+define Build/Prepare
+	mkdir -p $(PKG_BUILD_DIR)
+	cp -r ./src/* $(PKG_BUILD_DIR)/
+endef
+
+define Build/Compile
+	$(TARGET_CXX) \
+		$(TARGET_CXXFLAGS) -std=c++17 \
+		-I$(STAGING_DIR)/usr/include \
+		-I$(STAGING_DIR)/usr/include/nlohmann \
+		-L$(STAGING_DIR)/usr/lib \
+		$(PKG_BUILD_DIR)/main.cpp \
+		-o $(PKG_BUILD_DIR)/jsonval \
+		-lnlohmann_json_schema_validator
+endef
+
+define Package/jsonval/install
+	$(INSTALL_DIR) $(1)/usr/bin
+	$(INSTALL_BIN) $(PKG_BUILD_DIR)/jsonval $(1)/usr/bin/
+endef
+
+$(eval $(call BuildPackage,jsonval))
diff --git a/jsonval/src/main.cpp b/jsonval/src/main.cpp
new file mode 100644
index 000000000..ed914935b
--- /dev/null
+++ b/jsonval/src/main.cpp
@@ -0,0 +1,64 @@
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <nlohmann/json.hpp>
+#include <nlohmann/json-schema.hpp>
+
+using nlohmann::json;
+using nlohmann::json_schema::json_validator;
+using namespace std;
+
+void print_usage(const string& prog_name) {
+	cerr << "Usage: " << prog_name << " -s <schema.json> -j <data.json>" << endl;
+}
+
+int main(int argc, char* argv[]) {
+	string schema_path, data_path;
+
+	// Simple argument parsing
+	for (int i = 1; i < argc; ++i) {
+		string arg = argv[i];
+		if ((arg == "-s" || arg == "--schema") && i + 1 < argc) {
+			schema_path = argv[++i];
+		} else if ((arg == "-j" || arg == "--json") && i + 1 < argc) {
+			data_path = argv[++i];
+		} else {
+			print_usage(argv[0]);
+			return 1;
+		}
+	}
+
+	if (schema_path.empty() || data_path.empty()) {
+		print_usage(argv[0]);
+		return 1;
+	}
+
+	ifstream schema_file(schema_path);
+	ifstream data_file(data_path);
+
+	if (!schema_file.is_open() || !data_file.is_open()) {
+		cerr << "Error: Could not open one or both files." << endl;
+		return 2;
+	}
+
+	json schema, document;
+	try {
+		schema_file >> schema;
+		data_file >> document;
+	} catch (const json::parse_error& e) {
+		cerr << "Parse error: " << e.what() << endl;
+		return 3;
+	}
+
+	try {
+		json_validator validator;
+		validator.set_root_schema(schema);
+		validator.validate(document);
+		cout << "Valid" << endl;
+	} catch (const std::exception& e) {
+		cerr << "Validation failed: " << e.what() << endl;
+		return 4;
+	}
+
+	return 0;
+}