server.h

/**The MIT License (MIT)
Copyright (c) 2018 by AleksanderSergeevich
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#ifndef SERVER_H
#define SERVER_H
#pragma once
#include <QtNetwork>

#include "connection.h"

class TCPServer : public QTcpServer {
    Q_OBJECT
public:
    TCPServer(const quint16 port = 8080, QObject* parent = 0) : QTcpServer(parent) {
        server_start(port);
    }
    virtual ~TCPServer() {
        reset();
        if(this->isListening()) this->close();
    }

    virtual void reset() {
        if(!blocked_addresses.isEmpty()) blocked_addresses.clear();
        QHash<QString, QSharedPointer<TCPConnection> >::iterator iter = active_connections.begin();
        while(iter != active_connections.end()) {
            iter.value().reset();
        }
        active_connections.clear();
    }
    virtual void remove_conn(const QString conn_id) {
        active_connections[conn_id].reset();
        active_connections.remove(conn_id);
    }
    virtual void add_blocked_address(QHostAddress& addr) {
        blocked_addresses.append(addr);
    }
    virtual int remove_blocked_address(QHostAddress& addr) {
        return blocked_addresses.removeAll(addr);
    }
    QSharedPointer<TCPConnection> get_conn_ptr(const QString conn_id) const {
        if(!active_connections.contains(conn_id)) return QSharedPointer<TCPConnection>(NULL);
        return active_connections[conn_id];
    }
    void server_start(const quint16& port = 8080) {
        connect(this, SIGNAL(newConnection()), this, SLOT(onNewConnection()));
        QDateTime start_time = QDateTime::currentDateTime();
        if(listen(QHostAddress::Any, port)) {
            qInfo()<< "Server was started at: " << start_time.toString(QString("MMM d, yyyy @ h:m:s.zzz ap"));
        }
        else {
            qDebug()<< "Server failed to start at: " << start_time.toString(QString("MMM d, yyyy @ h:m:s.zzz ap"));
        }
    }
public slots:
    void onNewConnection() {
        if(!this->hasPendingConnections()) return;
        QTcpSocket* new_connection = this->nextPendingConnection();
        if(!blocked_addresses.isEmpty() && blocked_addresses.contains(new_connection->peerAddress())) {
            qInfo() << "Refuse to establish connection with: " << new_connection->peerAddress().toString();
            new_connection->disconnectFromHost();
            return;
        }
        active_connections.insert(new_connection->peerAddress().toString(), QSharedPointer<TCPConnection>(new TCPConnection(new_connection, this)));
    }
private:
    QList<QHostAddress> blocked_addresses;
    QHash<QString, QSharedPointer<TCPConnection> > active_connections;
};

#endif // SERVER_H