Add json-schema-validator library

thirdparty/json_schema_validator/json-patch.cpp

@@ -0,0 +1,115 @@
+#include "json-patch.hpp"
+
+#include <nlohmann/json-schema.hpp>
+
+namespace
+{
+
+// originally from http://jsonpatch.com/, http://json.schemastore.org/json-patch
+// with fixes
+const nlohmann::json patch_schema = R"patch({
+    "title": "JSON schema for JSONPatch files",
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "type": "array",
+
+    "items": {
+        "oneOf": [
+            {
+                "additionalProperties": false,
+                "required": [ "value", "op", "path"],
+                "properties": {
+                    "path" : { "$ref": "#/definitions/path" },
+                    "op": {
+                        "description": "The operation to perform.",
+                        "type": "string",
+                        "enum": [ "add", "replace", "test" ]
+                    },
+                    "value": {
+                        "description": "The value to add, replace or test."
+                    }
+                }
+            },
+            {
+                "additionalProperties": false,
+                "required": [ "op", "path"],
+                "properties": {
+                    "path" : { "$ref": "#/definitions/path" },
+                    "op": {
+                        "description": "The operation to perform.",
+                        "type": "string",
+                        "enum": [ "remove" ]
+                    }
+                }
+            },
+            {
+                "additionalProperties": false,
+                "required": [ "from", "op", "path" ],
+                "properties": {
+                    "path" : { "$ref": "#/definitions/path" },
+                    "op": {
+                        "description": "The operation to perform.",
+                        "type": "string",
+                        "enum": [ "move", "copy" ]
+                    },
+                    "from": {
+                        "$ref": "#/definitions/path",
+                        "description": "A JSON Pointer path pointing to the location to move/copy from."
+                    }
+                }
+            }
+        ]
+    },
+    "definitions": {
+        "path": {
+            "description": "A JSON Pointer path.",
+            "type": "string"
+        }
+    }
+})patch"_json;
+} // namespace
+
+namespace nlohmann
+{
+
+json_patch::json_patch(json &&patch)
+    : j_(std::move(patch))
+{
+	validateJsonPatch(j_);
+}
+
+json_patch::json_patch(const json &patch)
+    : j_(std::move(patch))
+{
+	validateJsonPatch(j_);
+}
+
+json_patch &json_patch::add(const json::json_pointer &ptr, json value)
+{
+	j_.push_back(json{{"op", "add"}, {"path", ptr}, {"value", std::move(value)}});
+	return *this;
+}
+
+json_patch &json_patch::replace(const json::json_pointer &ptr, json value)
+{
+	j_.push_back(json{{"op", "replace"}, {"path", ptr}, {"value", std::move(value)}});
+	return *this;
+}
+
+json_patch &json_patch::remove(const json::json_pointer &ptr)
+{
+	j_.push_back(json{{"op", "remove"}, {"path", ptr}});
+	return *this;
+}
+
+void json_patch::validateJsonPatch(json const &patch)
+{
+	// static put here to have it created at the first usage of validateJsonPatch
+	static nlohmann::json_schema::json_validator patch_validator(patch_schema);
+
+	patch_validator.validate(patch);
+
+	for (auto const &op : patch)
+		json::json_pointer(op["path"].get<std::string>());
+}
+
+} // namespace nlohmann