wifi.h

const char* ssid = "xxxx";
const char* password = "xxxx";
const char* host = "esp8266fs";

ESP8266WebServer server(80);
long rssi = WiFi.RSSI();
File fsUploadFile;

IPAddress timeServer(203,135,184,123); // au.pool.ntp.org
const int timeZone = 10;     // AEDT

WiFiUDP Udp;
unsigned int localPort = 8888;  // local port to listen for UDP packets
time_t prevDisplay = 0; // when the digital clock was displayed

unsigned long wait000 = 1000UL;

String getContentType(String filename){
  if(server.hasArg("download")) return "application/octet-stream";
  else if(filename.endsWith(".htm")) return "text/html";
  else if(filename.endsWith(".html")) return "text/html";
  else if(filename.endsWith(".css")) return "text/css";
  else if(filename.endsWith(".js")) return "application/javascript";
  else if(filename.endsWith(".png")) return "image/png";
  else if(filename.endsWith(".gif")) return "image/gif";
  else if(filename.endsWith(".jpg")) return "image/jpeg";
  else if(filename.endsWith(".ico")) return "image/x-icon";
  else if(filename.endsWith(".xml")) return "text/xml";
  else if(filename.endsWith(".pdf")) return "application/x-pdf";
  else if(filename.endsWith(".zip")) return "application/x-zip";
  else if(filename.endsWith(".gz")) return "application/x-gzip";
  return "text/plain";
}

bool handleFileRead(String path){
  String addy = server.client().remoteIP().toString();
  DBG_OUTPUT_PORT.print(addy + ":" + String(server.client().remotePort()) + " ");
  DBG_OUTPUT_PORT.print(String(day()) + "/" + String(month()) + "/" + String(year()) + " " + String(hour()) + ":" + String(minute()) + ":" + String(second()));
  DBG_OUTPUT_PORT.print(" handleFileRead: " + path); 
  if(path.endsWith("/")) path += "index.htm";
  String contentType = getContentType(path);
  String pathWithGz = path + ".gz";
  if(SPIFFS.exists(pathWithGz) || SPIFFS.exists(path)){
    if(SPIFFS.exists(pathWithGz))
      path += ".gz";
    File file = SPIFFS.open(path, "r");
    DBG_OUTPUT_PORT.println(" Size: " + String(file.size())); 
    size_t sent = server.streamFile(file, contentType);
    file.close();
    return true;
  }
  return false;
}

void handleFileUpload(){
  if(server.uri() != "/edit") return;
  HTTPUpload& upload = server.upload();
  if(upload.status == UPLOAD_FILE_START){
    String filename = upload.filename;
    if(!filename.startsWith("/")) filename = "/"+filename;
    DBG_OUTPUT_PORT.print("handleFileUpload Name: "); DBG_OUTPUT_PORT.println(filename);
    fsUploadFile = SPIFFS.open(filename, "w");
    filename = String();
  } else if(upload.status == UPLOAD_FILE_WRITE){
    //DBG_OUTPUT_PORT.print("handleFileUpload Data: "); DBG_OUTPUT_PORT.println(upload.currentSize);
    if(fsUploadFile)
      fsUploadFile.write(upload.buf, upload.currentSize);
  } else if(upload.status == UPLOAD_FILE_END){
    if(fsUploadFile)
      fsUploadFile.close();
    DBG_OUTPUT_PORT.print("handleFileUpload Size: "); DBG_OUTPUT_PORT.println(upload.totalSize);
  }
}

void handleFileDelete(){
  if(server.args() == 0) return server.send(500, "text/plain", "BAD ARGS");
  String path = server.arg(0);
  DBG_OUTPUT_PORT.println("handleFileDelete: " + path);
  if(path == "/")
    return server.send(500, "text/plain", "BAD PATH");
  if(!SPIFFS.exists(path))
    return server.send(404, "text/plain", "FileNotFound");
  SPIFFS.remove(path);
  server.send(200, "text/plain", "");
  path = String();
}

void handleFileCreate(){
  if(server.args() == 0)
    return server.send(500, "text/plain", "BAD ARGS");
  String path = server.arg(0);
  DBG_OUTPUT_PORT.println("handleFileCreate: " + path);
  if(path == "/")
    return server.send(500, "text/plain", "BAD PATH");
  if(SPIFFS.exists(path))
    return server.send(500, "text/plain", "FILE EXISTS");
  File file = SPIFFS.open(path, "w");
  if(file)
    file.close();
  else
    return server.send(500, "text/plain", "CREATE FAILED");
  server.send(200, "text/plain", "");
  path = String();
}

void handleFileList() {
  if(!server.hasArg("dir")) {server.send(500, "text/plain", "BAD ARGS"); return;}
  
  String path = server.arg("dir");
  DBG_OUTPUT_PORT.println("handleFileList: " + path);
  Dir dir = SPIFFS.openDir(path);
  path = String();

  String output = "[";
  while(dir.next()){
    File entry = dir.openFile("r");
    if (output != "[") output += ',';
    bool isDir = false;
    output += "{\"type\":\"";
    output += (isDir)?"dir":"file";
    output += "\",\"name\":\"";
    output += String(entry.name()).substring(1);
    output += "\"}";
    entry.close();
  }
  
  output += "]";
  server.send(200, "text/json", output);
}


/*-------- NTP code ----------*/


// send an NTP request to the time server at the given address
const int NTP_PACKET_SIZE = 48; // NTP time is in the first 48 bytes of message
byte packetBuffer[NTP_PACKET_SIZE]; //buffer to hold incoming & outgoing packets
void sendNTPpacket(IPAddress &address)
{
  // set all bytes in the buffer to 0
  memset(packetBuffer, 0, NTP_PACKET_SIZE);
  // Initialize values needed to form NTP request
  // (see URL above for details on the packets)
  packetBuffer[0] = 0b11100011;   // LI, Version, Mode
  packetBuffer[1] = 0;     // Stratum, or type of clock
  packetBuffer[2] = 6;     // Polling Interval
  packetBuffer[3] = 0xEC;  // Peer Clock Precision
  // 8 bytes of zero for Root Delay & Root Dispersion
  packetBuffer[12]  = 49;
  packetBuffer[13]  = 0x4E;
  packetBuffer[14]  = 49;
  packetBuffer[15]  = 52;
  // all NTP fields have been given values, now
  // you can send a packet requesting a timestamp:                 
  Udp.beginPacket(address, 123); //NTP requests are to port 123
  Udp.write(packetBuffer, NTP_PACKET_SIZE);
  Udp.endPacket();
}

time_t getNtpTime()
{
  while (Udp.parsePacket() > 0) ; // discard any previously received packets
  DBG_OUTPUT_PORT.println("Transmit NTP Request");
  sendNTPpacket(timeServer);
  uint32_t beginWait = millis();
  while (millis() - beginWait < 1500) {
    int size = Udp.parsePacket();
    if (size >= NTP_PACKET_SIZE) {
      DBG_OUTPUT_PORT.println("Receive NTP Response");
      Udp.read(packetBuffer, NTP_PACKET_SIZE);  // read packet into the buffer
      unsigned long secsSince1900;
      // convert four bytes starting at location 40 to a long integer
      secsSince1900 =  (unsigned long)packetBuffer[40] << 24;
      secsSince1900 |= (unsigned long)packetBuffer[41] << 16;
      secsSince1900 |= (unsigned long)packetBuffer[42] << 8;
      secsSince1900 |= (unsigned long)packetBuffer[43];
      return secsSince1900 - 2208988800UL + timeZone * SECS_PER_HOUR;
    }
  }
  DBG_OUTPUT_PORT.println("No NTP Response :-(");
  return 0; // return 0 if unable to get the time
}