ApplicationDispatcher.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
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 * MIT License
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#include "express/dispatcher/ApplicationDispatcher.h"
 
#include "core/socket/stream/SocketConnection.h"
#include "express/Controller.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 <string_view>
#include <tuple>
#include <unordered_map>
 
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
namespace express::dispatcher {
 
    ApplicationDispatcher::ApplicationDispatcher(
        const std::function<void(const std::shared_ptr<Request>&, const std::shared_ptr<Response>&)>& lambda)
        : lambda(lambda) {
    }
 
    bool ApplicationDispatcher::dispatch(express::Controller& controller,
                                         const std::string& parentMountPath,
                                         const express::MountPoint& mountPoint) {
        bool requestMatched = false;
 
        if (controller.getRequest()->method == mountPoint.method || mountPoint.method == "use" || mountPoint.method == "all") {
            const std::string absoluteMountPath = parentMountPath + mountPoint.relativeMountPath;
 
            if ((controller.getFlags() & Controller::NEXT) == 0) {
                // Split mount & request into path + query
                std::string_view mountPath;
                std::string_view mountQueryString;
                splitPathAndQuery(absoluteMountPath, mountPath, mountQueryString);
                auto requiredQueryPairs = parseQuery(mountQueryString);
 
                std::string_view requestPath;
                std::string_view requestQueryString;
                splitPathAndQuery(controller.getRequest()->originalUrl, requestPath, requestQueryString);
                auto requestQueryPairs = parseQuery(requestQueryString);
 
                // End-anchored equality (verbs) with one trailing slash relaxed when !strict
                std::string_view normalizedMountPath = mountPath;
                std::string_view normalizedRequestPath = requestPath;
                if (!controller.getStrictRouting()) {
                    normalizedMountPath = trimOneTrailingSlash(normalizedMountPath);
                    normalizedRequestPath = trimOneTrailingSlash(normalizedRequestPath);
                }
                if (normalizedMountPath.empty()) {
                    normalizedMountPath = "/";
                }
 
                bool pathMatches = false;
                if (mountPath.find(':') != std::string::npos) {
                    if (regex.mark_count() == 0) {
                        LOG(TRACE) << "ApplicationDispatcher: precompiled regex";
                        std::tie(regex, names) = compileParamRegex(mountPath,
                                                                   /*isPrefix*/ true,
                                                                   controller.getStrictRouting(),
                                                                   controller.getCaseInsensitiveRouting());
                    } else {
                        LOG(TRACE) << "ApplicationDispatcher: using precompiled regex";
                    }
                    pathMatches = matchAndFillParams(regex, names, requestPath, *controller.getRequest());
                } else {
                    pathMatches = equalPath(normalizedRequestPath, normalizedMountPath, controller.getCaseInsensitiveRouting());
                }
 
                const bool queryMatches = querySupersetMatches(requestQueryPairs, requiredQueryPairs);
                requestMatched = (pathMatches && queryMatches);
 
                LOG(TRACE) << controller.getResponse()->getSocketContext()->getSocketConnection()->getConnectionName()
                           << " HTTP Express: application -> " << (requestMatched ? "MATCH" : "NO MATCH");
                LOG(TRACE) << "           RequestMethod: " << controller.getRequest()->method;
                LOG(TRACE) << "              RequestUrl: " << controller.getRequest()->url;
                LOG(TRACE) << "             RequestPath: " << controller.getRequest()->path;
                LOG(TRACE) << "       Mountpoint Method: " << mountPoint.method;
                LOG(TRACE) << " Mountpoint RelativePath: " << mountPoint.relativeMountPath;
                LOG(TRACE) << " Mountpoint AbsolutePath: " << absoluteMountPath;
                LOG(TRACE) << "           StrictRouting: " << controller.getStrictRouting();
                LOG(TRACE) << "  CaseInsensitiveRouting: " << controller.getCaseInsensitiveRouting();
 
                if (requestMatched) {
                    controller.getRequest()->queries.insert(requestQueryPairs.begin(), requestQueryPairs.end());
 
                    if (hasResult(absoluteMountPath)) {
                        setParams(absoluteMountPath, *controller.getRequest());
                    }
 
                    lambda(controller.getRequest(), controller.getResponse());
                }
            } else {
                LOG(TRACE) << controller.getResponse()->getSocketContext()->getSocketConnection()->getConnectionName()
                           << " HTTP Express: application -> next(...) called";
                LOG(TRACE) << "           RequestMethod: " << controller.getRequest()->method;
                LOG(TRACE) << "              RequestUrl: " << controller.getRequest()->url;
                LOG(TRACE) << "             RequestPath: " << controller.getRequest()->path;
                LOG(TRACE) << "       AbsoluteMountPath: " << absoluteMountPath;
            }
        }
 
        return requestMatched;
    }
 
    std::list<std::string>
    ApplicationDispatcher::getRoutes(const std::string& parentMountPath, const MountPoint& mountPoint, bool strictRouting) const {
        std::list<std::string> routes{"A " + 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