RESTful API Server

// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "apibehavior.h"
#include "types.h"
#include "utils.h"
#include <QtCore/QCoreApplication>
#include <QtHttpServer/QHttpServer>
#define SCHEME "http"
#define HOST "127.0.0.1"
#define PORT 49425
template<typename T>
void addCrudRoutes(QHttpServer &httpServer, const QString &apiPath, CrudApi<T> &api,
                   const SessionApi &sessionApi)
{
    httpServer.route(
            QString("%1").arg(apiPath), QHttpServerRequest::Method::Get,
            [&api](const QHttpServerRequest &request) { return api.getPaginatedList(request); });
    httpServer.route(QString("%1/<arg>").arg(apiPath), QHttpServerRequest::Method::Get,
                     [&api](qint64 itemId) { return api.getItem(itemId); });
    httpServer.route(QString("%1").arg(apiPath), QHttpServerRequest::Method::Post,
                     [&api, &sessionApi](const QHttpServerRequest &request) {
                         if (!sessionApi.authorize(request)) {
                             return QHttpServerResponse(
                                     QHttpServerResponder::StatusCode::Unauthorized);
                         }
                         return api.postItem(request);
                     });
    httpServer.route(QString("%1/<arg>").arg(apiPath), QHttpServerRequest::Method::Put,
                     [&api, &sessionApi](qint64 itemId, const QHttpServerRequest &request) {
                         if (!sessionApi.authorize(request)) {
                             return QHttpServerResponse(
                                     QHttpServerResponder::StatusCode::Unauthorized);
                         }
                         return api.updateItem(itemId, request);
                     });
    httpServer.route(QString("%1/<arg>").arg(apiPath), QHttpServerRequest::Method::Patch,
                     [&api, &sessionApi](qint64 itemId, const QHttpServerRequest &request) {
                         if (!sessionApi.authorize(request)) {
                             return QHttpServerResponse(
                                     QHttpServerResponder::StatusCode::Unauthorized);
                         }
                         return api.updateItemFields(itemId, request);
                     });
    httpServer.route(QString("%1/<arg>").arg(apiPath), QHttpServerRequest::Method::Delete,
                     [&api, &sessionApi](qint64 itemId, const QHttpServerRequest &request) {
                         if (!sessionApi.authorize(request)) {
                             return QHttpServerResponse(
                                     QHttpServerResponder::StatusCode::Unauthorized);
                         }
                         return api.deleteItem(itemId);
                     });
}
int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);
    QCommandLineParser parser;
    parser.addOptions({
            { "port", QCoreApplication::translate("main", "The port the server listens on."),
              "port" },
    });
    parser.addHelpOption();
    parser.process(app);
    quint16 portArg = PORT;
    if (!parser.value("port").isEmpty())
        portArg = parser.value("port").toUShort();
    auto colorFactory = std::make_unique<ColorFactory>();
    auto colors = tryLoadFromFile<Color>(*colorFactory, ":/assets/colors.json");
    CrudApi<Color> colorsApi(std::move(colors), std::move(colorFactory));
    auto userFactory = std::make_unique<UserFactory>(SCHEME, HOST, portArg);
    auto users = tryLoadFromFile<User>(*userFactory, ":/assets/users.json");
    CrudApi<User> usersApi(std::move(users), std::move(userFactory));
    auto sessionEntryFactory = std::make_unique<SessionEntryFactory>();
    auto sessions = tryLoadFromFile<SessionEntry>(*sessionEntryFactory, ":/assets/sessions.json");
    SessionApi sessionApi(std::move(sessions), std::move(sessionEntryFactory));
    // Setup QHttpServer
    QHttpServer httpServer;
    httpServer.route("/", []() {
        return "Qt Colorpalette example server. Please see documentation for API description";
    });
    addCrudRoutes(httpServer, "/api/unknown", colorsApi, sessionApi);
    addCrudRoutes(httpServer, "/api/users", usersApi, sessionApi);
    // Login resource
    httpServer.route(
            "/api/login", QHttpServerRequest::Method::Post,
            [&sessionApi](const QHttpServerRequest &request) { return sessionApi.login(request); });
    httpServer.route("/api/register", QHttpServerRequest::Method::Post,
                     [&sessionApi](const QHttpServerRequest &request) {
                         return sessionApi.registerSession(request);
                     });
    httpServer.route("/api/logout", QHttpServerRequest::Method::Post,
                     [&sessionApi](const QHttpServerRequest &request) {
                         return sessionApi.logout(request);
                     });
    // Images resource
    httpServer.route("/img/faces/<arg>-image.jpg", QHttpServerRequest::Method::Get,
                     [](qint64 imageId, const QHttpServerRequest &) {
                         return QHttpServerResponse::fromFile(
                                 QString(":/assets/img/%1-image.jpg").arg(imageId));
                     });
    const auto port = httpServer.listen(QHostAddress::Any, portArg);
    if (!port) {
        qDebug() << QCoreApplication::translate("QHttpServerExample",
                                                "Server failed to listen on a port.");
        return 0;
    }
    qDebug() << QCoreApplication::translate(
                        "QHttpServerExample",
                        "Running on http://127.0.0.1:%1/ (Press CTRL+C to quit)")
                        .arg(port);
    return app.exec();
}