hyperion.ng/include/utils/jsonschema/JsonSchemaChecker.h

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#pragma once
// stl includes
#include <string>
#include <list>
// jsoncpp includes
#include <json/json.h>
/// JsonSchemaChecker is a very basic implementation of json schema.
/// The json schema definition draft can be found at
/// http://tools.ietf.org/html/draft-zyp-json-schema-03
///
/// The following keywords are supported:
/// - type
/// - required
/// - properties
/// - items
/// - enum
/// - minimum
/// - maximum
/// - addtionalProperties
/// - minItems
/// - maxItems
///
/// And the non-standard:
/// - dependencies
class JsonSchemaChecker
{
public:
JsonSchemaChecker();
virtual ~JsonSchemaChecker();
///
/// @param schema The schema to use
/// @return true upon succes
///
bool setSchema(const Json::Value & schema);
///
/// @brief Validate a JSON structure
/// @param value The JSON value to check
/// @return true when the arguments is valid according to the schema
///
bool validate(const Json::Value & value);
///
/// @return A list of error messages
///
const std::list<std::string> & getMessages() const;
private:
///
/// Validates a json-value against a given schema. Results are stored in the members of this
/// class (_error & _messages)
///
/// @param[in] value The value to validate
/// @param[in] schema The schema against which the value is validated
///
void validate(const Json::Value &value, const Json::Value & schema);
///
/// Adds the given message to the message-queue (with reference to current line-number)
///
/// @param[in] message The message to add to the queue
///
void setMessage(const std::string & message);
///
/// Retrieves all references from the json-value as specified by the schema
///
/// @param[in] value The json-value
/// @param[in] schema The schema
///
void collectDependencies(const Json::Value & value, const Json::Value &schema);
private:
// attribute check functions
///
/// Checks if the given value is of the specified type. If the type does not match _error is set
/// to true and an error-message is added to the message-queue
///
/// @param[in] value The given value
/// @param[in] schema The specified type (as json-value)
///
void checkType(const Json::Value & value, const Json::Value & schema);
///
/// Checks is required properties of an json-object exist and if all properties are of the
/// correct format. If this is not the case _error is set to true and an error-message is added
/// to the message-queue.
///
/// @param[in] value The given json-object
/// @param[in] schema The schema of the json-object
///
void checkProperties(const Json::Value & value, const Json::Value & schema);
///
/// Verifies the additional configured properties of an json-object. If this is not the case
/// _error is set to true and an error-message is added to the message-queue.
///
/// @param value The given json-object
/// @param schema The schema for the json-object
/// @param ignoredProperties The properties that were ignored
///
void checkAdditionalProperties(const Json::Value & value, const Json::Value & schema, const Json::Value::Members & ignoredProperties);
///
/// Checks if references are configued and used correctly. If this is not the case _error is set
/// to true and an error-message is added to the message-queue.
///
/// @param value The given json-object
/// @param schemaLink The schema of the json-object
///
void checkDependencies(const Json::Value & value, const Json::Value & schemaLink);
///
/// Checks if the given value is larger or equal to the specified value. If this is not the case
/// _error is set to true and an error-message is added to the message-queue.
///
/// @param[in] value The given value
/// @param[in] schema The minimum value (as json-value)
///
void checkMinimum(const Json::Value & value, const Json::Value & schema);
///
/// Checks if the given value is smaller or equal to the specified value. If this is not the
/// case _error is set to true and an error-message is added to the message-queue.
///
/// @param[in] value The given value
/// @param[in] schema The maximum value (as json-value)
///
void checkMaximum(const Json::Value & value, const Json::Value & schema);
///
/// Validates all the items of an array.
///
/// @param value The json-array
/// @param schema The schema for the items in the array
///
void checkItems(const Json::Value & value, const Json::Value & schema);
///
/// Checks if a given array has at least a minimum number of items. If this is not the case
/// _error is set to true and an error-message is added to the message-queue.
///
/// @param value The json-array
/// @param schema The minimum size specification (as json-value)
///
void checkMinItems(const Json::Value & value, const Json::Value & schema);
///
/// Checks if a given array has at most a maximum number of items. If this is not the case
/// _error is set to true and an error-message is added to the message-queue.
///
/// @param value The json-array
/// @param schema The maximum size specification (as json-value)
///
void checkMaxItems(const Json::Value & value, const Json::Value & schema);
///
/// Checks if a given array contains only unique items. If this is not the case
/// _error is set to true and an error-message is added to the message-queue.
///
/// @param value The json-array
/// @param schema Bool to enable the check (as json-value)
///
void checkUniqueItems(const Json::Value & value, const Json::Value & schema);
///
/// Checks if an enum value is actually a valid value for that enum. If this is not the case
/// _error is set to true and an error-message is added to the message-queue.
///
/// @param value The enum value
/// @param schema The enum schema definition
///
void checkEnum(const Json::Value & value, const Json::Value & schema);
private:
/// The schema of the entire json-configuration
Json::Value _schema;
/// The current location into a json-configuration structure being checked
std::list<std::string> _currentPath;
/// The result messages collected during the schema verification
std::list<std::string> _messages;
/// Flag indicating an error occured during validation
bool _error;
/// A list with references (string => json-value)
std::map<std::string, const Json::Value *> _references; // ref 2 value
};