Tasmota/lib/libesp32/ESP32-Mail-Client/src/WiFiClientSecureESP32.h

/*
 *Customized WiFiClientSecure.h to support STARTTLS protocol, version 1.0.1
 * 
 * The MIT License (MIT)
 * Copyright (c) 2019 K. Suwatchai (Mobizt)
 * 
 * 
 * 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.
*/

/*
  WiFiClientSecureESP32.h - Base class that provides Client SSL to ESP32
  Copyright (c) 2011 Adrian McEwen.  All right reserved.
  Additions Copyright (C) 2017 Evandro Luis Copercini.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

#ifndef WiFiClientSecureESP32_H
#define WiFiClientSecureESP32_H

#ifdef ESP32

#include "Arduino.h"
#include "IPAddress.h"
#include <WiFi.h>
#include "ssl_client32.h"

typedef void (*DebugMsgCallback)(const char* msg);

class WiFiClientSecureESP32 : public WiFiClient
{
protected:
    sslclient_context32 *sslclient;
 
    int _lastError = 0;
	int _peek = -1;
    int _timeout = 0;
    const char *_CA_cert;
    const char *_cert;
    const char *_private_key;
    const char *_pskIdent; // identity for PSK cipher suites
    const char *_psKey; // key in hex for PSK cipher suites
    DebugMsgCallback _debugCallback = NULL;

public:
    WiFiClientSecureESP32 *next;
    WiFiClientSecureESP32();
    WiFiClientSecureESP32(int socket);
    WiFiClientSecureESP32(bool starttls);
    ~WiFiClientSecureESP32();
    int connect(IPAddress ip, uint16_t port);
    int connect(IPAddress ip, uint16_t port, int32_t timeout);
    int connect(const char *host, uint16_t port);
    int connect(const char *host, uint16_t port, int32_t timeout);
    int connect(IPAddress ip, uint16_t port, const char *rootCABuff, const char *cli_cert, const char *cli_key);
    int connect(const char *host, uint16_t port, const char *rootCABuff, const char *cli_cert, const char *cli_key);
    int connect(IPAddress ip, uint16_t port, const char *pskIdent, const char *psKey);
    int connect(const char *host, uint16_t port, const char *pskIdent, const char *psKey);
	int peek();
    size_t write(uint8_t data);
    size_t write(const uint8_t *buf, size_t size);
    int available();
    int read();
    int read(uint8_t *buf, size_t size);
    void flush() {}
    void stop();
    uint8_t connected();
    int lastError(char *buf, const size_t size);
    void setPreSharedKey(const char *pskIdent, const char *psKey); // psKey in Hex
    void setCACert(const char *rootCA);
    void setCertificate(const char *client_ca);
    void setPrivateKey (const char *private_key);
    bool loadCACert(Stream& stream, size_t size);
    bool loadCertificate(Stream& stream, size_t size);
    bool loadPrivateKey(Stream& stream, size_t size);
    bool verify(const char* fingerprint, const char* domain_name);
    void setHandshakeTimeout(unsigned long handshake_timeout);
    void setSTARTTLS(bool starttls);
    void setDebugCB(DebugMsgCallback cb);

    operator bool()
    {
        return connected();
    }
    WiFiClientSecureESP32 &operator=(const WiFiClientSecureESP32 &other);
    bool operator==(const bool value)
    {
        return bool() == value;
    }
    bool operator!=(const bool value)
    {
        return bool() != value;
    }
    bool operator==(const WiFiClientSecureESP32 &);
    bool operator!=(const WiFiClientSecureESP32 &rhs)
    {
        return !this->operator==(rhs);
    };

    int socket()
    {
        return sslclient->socket = -1;
    }

private:
    char *_streamLoad(Stream& stream, size_t size);

    //friend class WiFiServer;
    using Print::write;
};

#endif //ESP32

#endif //WiFiClientSecureESP32_H