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, 2026
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 * This program is free software: you can redistribute it and/or modify
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 * MIT License
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#include "express/dispatcher/MiddlewareDispatcher.h"
 
#include "core/socket/stream/SocketConnection.h"
#include "express/Next.h"
#include "express/Request.h"
#include "express/Response.h"
#include "express/Route.h"
#include "express/dispatcher/regex_utils.h"
#include "web/http/server/SocketContext.h"
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include "log/Logger.h"
 
#include <list>
#include <unordered_map>
 
#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 MountPoint& mountPoint,
                                        bool strictRouting,
                                        bool caseInsensitiveRouting,
                                        bool mergeParams) {
        LOG(TRACE) << "======================= MIDDLEWARE  DISPATCH =======================";
        LOG(TRACE) << controller.getResponse()->getSocketContext()->getSocketConnection()->getConnectionName();
        LOG(TRACE) << "          Request Method: " << controller.getRequest()->method;
        LOG(TRACE) << "             Request Url: " << controller.getRequest()->url;
        LOG(TRACE) << "            Request Path: " << controller.getRequest()->path;
        LOG(TRACE) << "       Mountpoint Method: " << mountPoint.method;
        LOG(TRACE) << "         Mountpoint Path: " << mountPoint.relativeMountPath;
        LOG(TRACE) << "           StrictRouting: " << strictRouting;
        LOG(TRACE) << "  CaseInsensitiveRouting: " << caseInsensitiveRouting;
        LOG(TRACE) << "             MergeParams: " << mergeParams;
 
        bool dispatched = false;
 
        const bool methodMatchesResult = methodMatches(controller.getRequest()->method, mountPoint.method);
 
        if (methodMatchesResult && ((controller.getFlags() & Controller::NEXT) == 0)) {
            const MountMatchResult match =
                matchMountPoint(controller, mountPoint.relativeMountPath, mountPoint, regex, names, strictRouting, caseInsensitiveRouting);
 
            if (match.requestMatched) {
                LOG(TRACE) << "----------------------- MIDDLEWARE     MATCH -----------------------";
 
                dispatched = true;
 
                if (!match.decodeError) {
                    express::Request& request = *controller.getRequest();
                    request.queries.insert(match.requestQueryPairs.begin(), match.requestQueryPairs.end());
 
                    // Express-style mount path stripping is only applied for use()
                    const ScopedPathStrip pathStrip(request, match.isPrefix, match.consumedLength);
                    const ScopedParams scopedParams(request, match.params, mergeParams);
 
                    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";
                        dispatched = false;
                        controller = next.controller;
                    }
                } else {
                    controller.getResponse()->sendStatus(400);
                }
 
            } else {
                LOG(TRACE) << "----------------------- MIDDLEWARE   NOMATCH -----------------------";
            }
        } else {
            LOG(TRACE) << "----------------------- MIDDLEWARE   NOMATCH -----------------------";
        }
 
        return dispatched;
    }
 
    std::list<std::string>
    MiddlewareDispatcher::getRoutes(const std::string& parentMountPath, const MountPoint& mountPoint, bool strictRouting) const {
        std::list<std::string> routes{"M " + joinMountPath(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