TelegramCommandBot/OTAserver.h at main · retrojon/TelegramCommandBot · GitHub

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WebServer server(80);

  /* Server Index Page */

    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>";

  /* return index page which is stored in serverIndex */

    server.on("/", 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();