esp-link/examples/arduino/libraries/EspLink/WebServer.cpp

#include "WebServer.h"
#include "Arduino.h"

#define RESUBSCRIBE_LIMIT 1000

WebServer * WebServer::instance = NULL;

void webServerCallback(CmdRequest *req)
{
  WebServer::getInstance()->handleRequest(req);
}

WebServer::WebServer(Stream &streamIn, const WebMethod * PROGMEM methodsIn):espLink(streamIn, webServerCallback),methods(methodsIn),stream(streamIn)
{
  instance = this;
}

void WebServer::init()
{
  registerCallback();
}

void WebServer::loop()
{
  // resubscribe periodically
  uint32_t elapsed = millis() - last_connect_ts;
  if( elapsed > RESUBSCRIBE_LIMIT )
    registerCallback();
  espLink.readLoop();
}

void WebServer::registerCallback()
{
  espLink.sendPacketStart(CMD_CB_ADD, 100, 1);
  espLink.sendPacketArg(5, (uint8_t *)"webCb");
  espLink.sendPacketEnd();
  last_connect_ts = millis();
}

void WebServer::invokeMethod(RequestReason reason, WebMethod * method, CmdRequest *req)
{
  switch(reason)
  {
    case WS_BUTTON:
      {
        uint16_t len = espLink.cmdArgLen(req);
        char bf[len+1];
        bf[len] = 0;
        espLink.cmdPopArg(req, bf, len);

        method->callback(BUTTON_PRESS, bf, len);
      }
      break;
    case WS_SUBMIT:
      {
        int arg_len = espLink.cmdGetArgc( req );
        int cnt = 4;

        while( cnt < arg_len )
        {
          uint16_t len = espLink.cmdArgLen(req);
          char bf[len+1];
          bf[len] = 0;
          espLink.cmdPopArg(req, bf, len);

          value_ptr = bf + 2 + strlen(bf+1);
          method->callback(SET_FIELD, bf+1, strlen(bf+1));
          
          cnt++;
        }
      }
      return;
    case WS_LOAD:
    case WS_REFRESH:
      break;
    default:
      return;
  }

  espLink.sendPacketStart(CMD_WEB_JSON_DATA, 100, 255);
  espLink.sendPacketArg(4, remote_ip);
  espLink.sendPacketArg(2, (uint8_t *)&remote_port);

  method->callback( reason == WS_LOAD ? LOAD : REFRESH, NULL, 0);

  espLink.sendPacketArg(0, NULL);
  espLink.sendPacketEnd();
}

void WebServer::handleRequest(CmdRequest *req)
{
  uint16_t shrt;
  espLink.cmdPopArg(req, &shrt, 2);
  RequestReason reason = (RequestReason)shrt;

  espLink.cmdPopArg(req, &remote_ip, 4);
  espLink.cmdPopArg(req, &remote_port, 2);

  {
    uint16_t len = espLink.cmdArgLen(req);
    char bf[len+1];
    bf[len] = 0;
    espLink.cmdPopArg(req, bf, len);

    const WebMethod * meth = methods;
    do
    {
      WebMethod m;
      memcpy_P(&m, meth, sizeof(WebMethod));
      if( m.url == NULL || m.callback == NULL )
        break;

      if( strcmp_P(bf, m.url) == 0 )
      {
        invokeMethod(reason, &m, req);
        return;
      }
      meth++;
    }while(1);
  }

  if( reason == WS_SUBMIT )
    return;

  // empty response
  espLink.sendPacketStart(CMD_WEB_JSON_DATA, 100, 2);
  espLink.sendPacketArg(4, remote_ip);
  espLink.sendPacketArg(2, (uint8_t *)&remote_port);
  espLink.sendPacketEnd();
}

void WebServer::setArgString(const char * name, const char * value)
{
  uint8_t nlen = strlen(name);
  uint8_t vlen = strlen(value);
  char buf[nlen + vlen + 3];
  buf[0] = WEB_STRING;
  strcpy(buf+1, name);
  strcpy(buf+2+nlen, value);
  espLink.sendPacketArg(nlen+vlen+2, (uint8_t *)buf);
}

void WebServer::setArgStringP(const char * name, const char * value)
{
  uint8_t nlen = strlen(name);
  uint8_t vlen = strlen_P(value);
  char buf[nlen + vlen + 3];
  buf[0] = WEB_STRING;
  strcpy(buf+1, name);
  strcpy_P(buf+2+nlen, value);
  espLink.sendPacketArg(nlen+vlen+2, (uint8_t *)buf);
}

void WebServer::setArgBoolean(const char * name, uint8_t value)
{
  uint8_t nlen = strlen(name);
  char buf[nlen + 4];
  buf[0] = WEB_BOOLEAN;
  strcpy(buf+1, name);
  buf[2 + nlen] = value;
  espLink.sendPacketArg(nlen+3, (uint8_t *)buf);
}

void WebServer::setArgJson(const char * name, const char * value)
{
  uint8_t nlen = strlen(name);
  uint8_t vlen = strlen(value);
  char buf[nlen + vlen + 3];
  buf[0] = WEB_JSON;
  strcpy(buf+1, name);
  strcpy(buf+2+nlen, value);
  espLink.sendPacketArg(nlen+vlen+2, (uint8_t *)buf);
}

void WebServer::setArgInt(const char * name, int32_t value)
{
  uint8_t nlen = strlen(name);
  char buf[nlen + 7];
  buf[0] = WEB_INTEGER;
  strcpy(buf+1, name);
  memcpy(buf+2+nlen, &value, 4);
  espLink.sendPacketArg(nlen+6, (uint8_t *)buf);
}

int32_t WebServer::getArgInt()
{
  return (int32_t)atol(value_ptr);
}

char * WebServer::getArgString()
{
  return value_ptr;
}

uint8_t WebServer::getArgBoolean()
{
  if( strcmp_P(value_ptr, PSTR("on")) == 0 )
    return 1;
  if( strcmp_P(value_ptr, PSTR("true")) == 0 )
    return 1;
  if( strcmp_P(value_ptr, PSTR("yes")) == 0 )
    return 1;
  if( strcmp_P(value_ptr, PSTR("1")) == 0 )
    return 1;
  return 0;
}