StaticMiddleware.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/middleware/StaticMiddleware.h"
 
#include "core/socket/stream/SocketConnection.h"
#include "web/http/http_utils.h"
#include "web/http/server/SocketContext.h"
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include "log/Logger.h"
 
#include <map>
 
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
namespace express::middleware {
 
    StaticMiddleware::StaticMiddleware(const std::string& root)
        : root(root)
        , index("index.html") {
        setStrictRouting(false);
 
        use(
            [&stdHeaders = this->stdHeaders, &stdCookies = this->stdCookies, &connectionState = this->defaultConnectionState] MIDDLEWARE(
                req, res, next) {
                LOG(DEBUG) << res->getSocketContext()->getSocketConnection()->getConnectionName() << " Express " << req->method;
 
                if (req->method != "GET") {
                    res->sendStatus(405, "Unsupported method: " + req->method + "\n");
                } else {
                    if (connectionState == web::http::ConnectionState::Close) {
                        res->set("Connection", "close");
                    } else if (connectionState == web::http::ConnectionState::Keep) {
                        res->set("Connection", "keep-alive");
                    }
                    res->set(stdHeaders);
 
                    for (auto& [value, options] : stdCookies) {
                        res->cookie(value, options.getValue(), options.getOptions());
                    }
 
                    next();
                }
            },
            [&index = this->index] MIDDLEWARE(req, res, next) {
                if (req->path == "/") {
                    if (index.empty()) {
                        res->status(404).send("Unsupported resource: " + req->url + "\n");
                    } else {
                        LOG(INFO) << res->getSocketContext()->getSocketConnection()->getConnectionName()
                                  << " Express StaticMiddleware Redirecting: " << req->url << " -> "
                                  << req->originalPath +
                                         (!req->originalPath.empty() && req->originalPath.back() != '/' && index.front() != '/' ? "/"
                                                                                                                                : "") +
                                         index;
                        res->redirect(
                            308,
                            req->originalPath +
                                (!req->originalPath.empty() && req->originalPath.back() != '/' && index.front() != '/' ? "/" : "") + index);
                    }
                } else {
                    next();
                }
            },
            [&root = this->root] MIDDLEWARE(req, res, next) {
                const std::string decodedPath = httputils::url_decode(req->path);
                res->sendFile(root + decodedPath, [&root, decodedPath, req, res, &next](int ret) {
                    if (ret == 0) {
                        LOG(INFO) << res->getSocketContext()->getSocketConnection()->getConnectionName()
                                  << " Express StaticMiddleware: GET " << req->url + " -> " << root + decodedPath;
                    } else {
                        PLOG(ERROR) << res->getSocketContext()->getSocketConnection()->getConnectionName() << " Express StaticMiddleware "
                                    << req->url + " -> " << root + decodedPath;
 
                        next();
                    }
                });
            });
    }
 
    class StaticMiddleware& StaticMiddleware::setIndex(const std::string& index) {
        this->index = index;
 
        return *this;
    }
 
    class StaticMiddleware& StaticMiddleware::clearStdHeaders() {
        this->stdHeaders.clear();
 
        return *this;
    }
 
    class StaticMiddleware& StaticMiddleware::setStdHeaders(const std::map<std::string, std::string>& stdHeaders) {
        this->stdHeaders = stdHeaders;
 
        return *this;
    }
 
    class StaticMiddleware& StaticMiddleware::appendStdHeaders(const std::map<std::string, std::string>& stdHeaders) {
        this->stdHeaders.insert(stdHeaders.begin(), stdHeaders.end());
 
        return *this;
    }
 
    class StaticMiddleware& StaticMiddleware::appendStdHeaders(const std::string& field, const std::string& value) {
        this->stdHeaders[field] = value;
 
        return *this;
    }
 
    class StaticMiddleware& StaticMiddleware::appendStdCookie(const std::string& name,
                                                              const std::string& value,
                                                              const std::map<std::string, std::string>& options) {
        this->stdCookies.insert({name, web::http::CookieOptions(value, options)});
 
        return *this;
    }
 
    class StaticMiddleware& StaticMiddleware::afterResponse(web::http::ConnectionState connectionState) {
        this->defaultConnectionState = connectionState;
 
        return *this;
    }
 
    class StaticMiddleware& StaticMiddleware::instance(const std::string& root) {
        // Keep all created static middlewares alive
        static std::map<const std::string, std::shared_ptr<class StaticMiddleware>> staticMiddlewares;
 
        if (!staticMiddlewares.contains(root)) {
            staticMiddlewares[root] = std::shared_ptr<StaticMiddleware>(new StaticMiddleware(root));
        }
 
        return *staticMiddlewares[root];
    }
 
    // "Constructor" of StaticMiddleware
    class StaticMiddleware& StaticMiddleware(const std::string& root) {
        return StaticMiddleware::instance(root);
    }
 
} // namespace express::middleware