Connection.h

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/*
 * MIT License
 *
 * Copyright (c) 2020-2022 Frozen Storm Interactive, Yoann Potinet
 *
 * 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.
 */
 
#pragma once
 
#include "CoreMinimal.h"
#include "IWebSocket.h"
#include "Interfaces/IHttpRequest.h"

class SIGNALR_API FConnection : public TSharedFromThis<FConnection>
{
public:
    FConnection(const FString& InHost, const TMap<FString, FString>& InHeaders);

    virtual ~FConnection();
 
    FConnection(const FConnection&) = delete;
    FConnection& operator=(const FConnection&) = delete;
    FConnection(FConnection&&) = delete;
    FConnection& operator=(FConnection&&) = delete;

    void Connect();

    bool IsConnected() const;

    void Send(const FString& Data);

    void Close(int32 Code = 1000, const FString& Reason = FString());
 
    DECLARE_EVENT(FConnection, FConnectionFailedEvent);

    FConnectionFailedEvent& OnConnectionFailed();

    IWebSocket::FWebSocketConnectedEvent& OnConnected();

    IWebSocket::FWebSocketConnectionErrorEvent& OnConnectionError();

    IWebSocket::FWebSocketClosedEvent& OnClosed();

    IWebSocket::FWebSocketMessageEvent& OnMessage();
 
private:
    void Negotiate();
    void OnNegotiateResponse(FHttpRequestPtr InRequest, FHttpResponsePtr InResponse, bool bConnectedSuccessfully);
    void StartWebSocket();
 
    TSharedPtr<IWebSocket> Connection;
    FString Host;
    TMap<FString, FString> Headers;
 
    FConnectionFailedEvent OnConnectionFailedEvent;
    IWebSocket::FWebSocketConnectedEvent OnConnectedEvent;
    IWebSocket::FWebSocketConnectionErrorEvent OnConnectionErrorEvent;
    IWebSocket::FWebSocketClosedEvent OnClosedEvent;
    IWebSocket::FWebSocketMessageEvent OnMessageEvent;
 
    FString ConnectionToken;
    FString ConnectionId;
 
    static FString ConvertToWebsocketUrl(const FString& Url);
};