json_error_builder.hpp

#pragma once
 
#include <userver/formats/json/value.hpp>
#include <userver/http/content_type.hpp>
 
#include <userver/server/handlers/exceptions.hpp>
 
USERVER_NAMESPACE_BEGIN
 
namespace server::handlers {
 
/// JSON error message builder.
/// Useful for handlers derived from HttpHandlerBase but responding via JSON.
class JsonErrorBuilder {
public:
    static constexpr bool kIsExternalBodyFormatted = true;
 
    explicit JsonErrorBuilder(const CustomHandlerException& ex);
 
    JsonErrorBuilder(
        std::string_view error_code,
        std::string internal_message,
        std::string_view external_error_body,
        formats::json::Value = {}
    );
 
    const std::string& GetInternalMessage() const { return internal_message_; };
 
    const std::string& GetExternalBody() const { return json_error_body_; }
 
    static const USERVER_NAMESPACE::http::ContentType& GetContentType() {
        return USERVER_NAMESPACE::http::content_type::kApplicationJson;
    }
 
private:
    std::string internal_message_;
    std::string json_error_body_;
};
 
}  // namespace server::handlers
 
USERVER_NAMESPACE_END