Added OTAWebupdated (espressif#1544)

* added OTAWebUpdater

* added OTAWebUpdater

* Updated OTAWebUpdater

Author: karan6190

Diff for: libraries/ArduinoOTA/examples/OTAWebUpdater/OTAWebUpdater.ino

@@ -0,0 +1,160 @@
+#include <WiFi.h>
+#include <WiFiClient.h>
+#include <WebServer.h>
+#include <ESPmDNS.h>
+#include <Update.h>
+
+const char* host = "ESP32";
+const char* ssid = "xxx";
+const char* password = "xxxx";
+
+WebServer server(80);
+
+const char* loginIndex = "<form name='loginForm'>"
+                         "<table width='20%' bgcolor='A09F9F' align='center'>"
+                         "<tr>"
+                         "<td colspan=2><center><font size=4><b>ESP32 Login Page</b></font></center>"
+                         "<br>"
+
+                         "</td>"
+                         "<br>"
+                         "<br>"
+                         "</tr>"
+                         "<td>Username:</td>"
+                         "<td><input type='text' size=25 name='userid'><br></td>"
+                         "</tr>"
+                         "<br>"
+                         "<br>"
+                         "<tr>"
+                         "<td>Password:</td>"
+                         "<td><input type='Password' size=25 name='pwd'><br></td>"
+                         "<br>"
+                         "<br>"
+                         "</tr>"
+
+                         "<tr>"
+                         "<td><input type='submit' onclick='check(this.form)' value='Login'></td>"
+                         "</tr>"
+                         "</table>"
+                         "</form>"
+                         "<script>"
+                         "function check(form)"
+                         "{"
+                         "if(form.userid.value=='admin' && form.pwd.value=='admin')"
+                         "{"
+                           "window.open('/serverIndex')"
+                         "}"
+                         "else"
+                         "{"
+                         " alert('Error Password or Username')/*displays error message*/"
+                         
+                         "}"
+                         "}"
+                         "</script>";
+
+
+
+
+
+const char* serverIndex = "<script src='https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js'></script>"
+                          "<form method='POST' action='#' enctype='multipart/form-data' id='upload_form'>"
+                          "<input type='file' name='update'>"
+                          "<input type='submit' value='Update'>"
+                          "</form>"
+                          "<div id='prg'>progress: 0%</div>"
+                          "<script>"
+                          "$('form').submit(function(e){"
+                          "e.preventDefault();"
+                          "var form = $('#upload_form')[0];"
+                          "var data = new FormData(form);"
+                          " $.ajax({"
+                          "url: '/update',"
+                          "type: 'POST',"
+                          "data: data,"
+                          "contentType: false,"
+                          "processData:false,"
+                          "xhr: function() {"
+                          "var xhr = new window.XMLHttpRequest();"
+                          "xhr.upload.addEventListener('progress', function(evt) {"
+                          "if (evt.lengthComputable) {"
+                          "var per = evt.loaded / evt.total;"
+                          "$('#prg').html('progress: ' + Math.round(per*100) + '%');"
+                          "}"
+                          "}, false);"
+                          "return xhr;"
+                          "},"
+                          "success:function(d, s) {"
+                          "console.log('success!')"
+                          "},"
+                          "error: function (a, b, c) {"
+                          "}"
+                          "});"
+                          "});"
+                          "</script>";
+void setup(void) {
+  Serial.begin(115200);
+
+  // Connect to WiFi network
+  WiFi.begin(ssid, password);
+  Serial.println("");
+
+  // Wait for connection
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+  Serial.println("");
+  Serial.print("Connected to ");
+  Serial.println(ssid);
+  Serial.print("IP address: ");
+  Serial.println(WiFi.localIP());
+
+  /*use mdns for host name resolution*/
+  if (!MDNS.begin(host)) {            //http://esp32.local
+    Serial.println("Error setting up MDNS responder!");
+    while (1) {
+      delay(1000);
+    }
+  }
+  Serial.println("mDNS responder started");
+  /*return index page which is stored in serverIndex */
+  server.on("/", HTTP_GET, []() {
+    server.sendHeader("Connection", "close");
+    server.send(200, "text/html", loginIndex);
+  });
+  server.on("/serverIndex", HTTP_GET, []() {
+    server.sendHeader("Connection", "close");
+    server.send(200, "text/html", serverIndex);
+  });
+  /*handling uploading firmware file */
+  server.on("/update", HTTP_POST, []() {
+    server.sendHeader("Connection", "close");
+    server.send(200, "text/plain", (Update.hasError()) ? "FAIL" : "OK");
+    ESP.restart();
+  }, []() {
+    HTTPUpload& upload = server.upload();
+    if (upload.status == UPLOAD_FILE_START) {
+      Serial.printf("Update: %s\n", upload.filename.c_str());
+      if (!Update.begin(UPDATE_SIZE_UNKNOWN)) { //start with max available size
+        Update.printError(Serial);
+      }
+    } else if (upload.status == UPLOAD_FILE_WRITE) {
+      /* flashing firmware to ESP*/
+      if (Update.write(upload.buf, upload.currentSize) != upload.currentSize) {
+        Update.printError(Serial);
+      }
+    } else if (upload.status == UPLOAD_FILE_END) {
+      if (Update.end(true)) { //true to set the size to the current progress
+        Serial.printf("Update Success: %u\nRebooting...\n", upload.totalSize);
+      } else {
+        Update.printError(Serial);
+      }
+    }
+  });
+  server.begin();
+}
+
+void loop(void) {
+  server.handleClient();
+  delay(1);
+}