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e849166599
Summary: related to T13242 Reviewers: ivica Reviewed By: ivica Subscribers: miljen, iljazovic Differential Revision: https://repo.mireo.local/D26860
135 lines
3.0 KiB
C++
135 lines
3.0 KiB
C++
#ifndef ASYNC_MQTT5_ANY_AUTHENTICATOR
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#define ASYNC_MQTT5_ANY_AUTHENTICATOR
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#include <boost/asio/any_completion_handler.hpp>
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#include <boost/asio/async_result.hpp>
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#include <boost/type_traits/is_detected.hpp>
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#include <boost/type_traits/is_detected_convertible.hpp>
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#include <async_mqtt5/types.hpp>
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namespace async_mqtt5 {
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namespace asio = boost::asio;
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using error_code = boost::system::error_code;
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namespace detail {
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using auth_handler_type = asio::any_completion_handler<
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void (error_code ec, std::string auth_data)
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>;
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template <typename T, typename ...Ts>
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using async_auth_sig = decltype(
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std::declval<T>().async_auth(std::declval<Ts>()...)
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);
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template <typename T>
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using method_sig = decltype(
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std::declval<T>().method()
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);
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template <typename T>
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constexpr bool is_authenticator =
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boost::is_detected<
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async_auth_sig, T,
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auth_step_e, std::string, auth_handler_type
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>::value &&
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boost::is_detected_convertible_v<std::string_view, method_sig, T>;
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class auth_fun_base {
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using auth_func = void(*)(
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auth_step_e, std::string, auth_handler_type, auth_fun_base*
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);
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auth_func _auth_func;
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public:
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auth_fun_base(auth_func f) : _auth_func(f) {}
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~auth_fun_base() = default;
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void async_auth(
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auth_step_e step, std::string data,
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auth_handler_type auth_handler
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) {
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_auth_func(step, std::move(data), std::move(auth_handler), this);
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}
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};
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template <
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typename Authenticator,
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typename = std::enable_if_t<is_authenticator<Authenticator>>
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>
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class auth_fun : public auth_fun_base {
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Authenticator _authenticator;
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public:
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auth_fun(Authenticator authenticator) :
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auth_fun_base(&async_auth),
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_authenticator(std::forward<Authenticator>(authenticator))
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{}
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static void async_auth(
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auth_step_e step, std::string data, auth_handler_type auth_handler,
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auth_fun_base* base_ptr
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) {
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auto auth_fun_ptr = static_cast<auth_fun*>(base_ptr);
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auth_fun_ptr->_authenticator.async_auth(
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step, std::move(data), std::move(auth_handler)
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);
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}
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};
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} // end namespace detail
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class any_authenticator {
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std::string _method;
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std::unique_ptr<detail::auth_fun_base> _auth_fun;
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public:
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any_authenticator() = default;
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template <
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typename Authenticator,
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std::enable_if_t<detail::is_authenticator<Authenticator>, bool> = true
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>
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any_authenticator(Authenticator&& a) :
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_method(a.method()),
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_auth_fun(
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new detail::auth_fun<Authenticator>(
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std::forward<Authenticator>(a)
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)
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)
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{}
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std::string_view method() const {
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return _method;
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}
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template <typename CompletionToken>
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decltype(auto) async_auth(
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auth_step_e step, std::string data,
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CompletionToken&& token
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) {
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using Signature = void (error_code, std::string);
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auto initiation = [](
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auto handler, any_authenticator& self,
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auth_step_e step, std::string data
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) {
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self._auth_fun->async_auth(
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step, std::move(data), std::move(handler)
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);
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};
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return asio::async_initiate<CompletionToken, Signature>(
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initiation, token, std::ref(*this), step, std::move(data)
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);
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}
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};
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} // end namespace async_mqtt5
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#endif // !ASYNC_MQTT5_ANY_AUTHENTICATOR
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