MiddlewareDispatcher.cpp

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/*
 * SNode.C - A Slim Toolkit for Network Communication
 * Copyright (C) Volker Christian <me@vchrist.at>
 *               2020, 2021, 2022, 2023, 2024, 2025
 *
 * This program is free software: you can redistribute it and/or modify
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 * This program is distributed in the hope that it will be useful,
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 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
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 * MIT License
 *
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#include "express/dispatcher/MiddlewareDispatcher.h"
 
#include "express/Next.h"
#include "express/Request.h"
#include "express/Route.h"
#include "express/dispatcher/regex_utils.h"
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include "log/Logger.h"
 
#include <list>
 
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
namespace express::dispatcher {
 
    MiddlewareDispatcher::MiddlewareDispatcher(
        const std::function<void(const std::shared_ptr<Request>&, const std::shared_ptr<Response>&, express::Next&)>& lambda)
        : lambda(lambda) {
    }
 
    bool MiddlewareDispatcher::dispatch(express::Controller& controller, const std::string& parentMountPath, const MountPoint& mountPoint) {
        bool requestMatched = false;
 
        if ((controller.getFlags() & Controller::NEXT) == 0) {
            const std::string absoluteMountPath = parentMountPath + mountPoint.relativeMountPath;
 
            const std::string requestMethod = controller.getRequest()->method;
            const std::string requestUrl = controller.getRequest()->url;
            const std::string requestPath = controller.getRequest()->path;
 
            // clang-format off
            requestMatched =
                (
                    (
                        (
                            mountPoint.method == requestMethod
                        ) || (
                            mountPoint.method == "all"
                        )
                    ) && (
                        (
                            requestUrl == absoluteMountPath
                        ) || (
                            (
                                !controller.getStrictRouting()
                            ) && (
                                requestPath.starts_with(absoluteMountPath)
                            )
                        ) || (
                            checkForUrlMatch(absoluteMountPath, requestUrl)
                        )
                    )
                ) || (
                    (
                        mountPoint.method == "use"
                    ) && (
                        (
                            requestUrl.starts_with(absoluteMountPath)
                        )
                    )
                );
            // clang-format on
 
            LOG(TRACE) << "Express: M - RequestUrl: " << controller.getRequest()->url;
            LOG(TRACE) << "Express: M - RequestPath: " << controller.getRequest()->path;
            LOG(TRACE) << "Express: M - AbsoluteMountPath: " << absoluteMountPath;
            LOG(TRACE) << "Express: M - StrictRouting: " << controller.getStrictRouting();
 
            if (requestMatched) {
                LOG(TRACE) << "      MATCH";
                if (hasResult(absoluteMountPath)) {
                    setParams(absoluteMountPath, *controller.getRequest());
                }
 
                Next next(controller);
                lambda(controller.getRequest(), controller.getResponse(), next);
 
                // If next() was called synchronously continue current route-tree traversal
                if ((next.controller.getFlags() & express::Controller::NEXT) != 0) {
                    LOG(TRACE) << "Express: M - Next called - set to NO MATCH";
                    requestMatched = false;
                    controller = next.controller;
                }
            } else {
                LOG(TRACE) << "      NO MQTCH";
            }
        }
 
        return requestMatched;
    }
 
    std::list<std::string>
    MiddlewareDispatcher::getRoutes(const std::string& parentMountPath, const MountPoint& mountPoint, bool strictRouting) const {
        std::list<std::string> routes{"M " + parentMountPath + mountPoint.relativeMountPath + (!strictRouting ? "*" : "")};
        routes.push_back("  " + mountPoint.method + " " + mountPoint.relativeMountPath);
 
        if (nextRoute) {
            routes.splice(routes.end(), nextRoute->getRoute(parentMountPath, strictRouting));
        }
 
        return routes;
    }
 
} // namespace express::dispatcher