ESP32_ChinaDieselHeater_Con.../src/Afterburner/src/WiFi/BTCWebServer.cpp
2019-07-09 22:19:21 +10:00

838 lines
26 KiB
C++

/*
* This file is part of the "bluetoothheater" distribution
* (https://gitlab.com/mrjones.id.au/bluetoothheater)
*
* Copyright (C) 2018 Ray Jones <ray@mrjones.id.au>
* Copyright (C) 2018 James Clark
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
#define USE_EMBEDDED_WEBUPDATECODE
#include <Arduino.h>
#include "BTCWifi.h"
#include "BTCWebServer.h"
#include "BTCota.h"
#include "../Utility/DebugPort.h"
#include "../Protocol/TxManage.h"
#include "../Utility/helpers.h"
#include "../cfg/pins.h"
#include "../cfg/BTCConfig.h"
#include "../Utility/BTC_JSON.h"
#include "../Utility/Moderator.h"
#include "../Libraries/WiFiManager-dev/WiFiManager.h"
#include <SPIFFS.h>
#include "../Utility/NVStorage.h"
#include <WiFiClient.h>
#include <WebServer.h>
#include <ESPmDNS.h>
#include <Update.h>
extern WiFiManager wm;
extern const char* stdHeader;
extern const char* formatIndex;
extern const char* updateIndex;
extern const char* formatDoneContent;
File fsUploadFile; // a File object to temporarily store the received file
int SPIFFSupload = 0;
WebServer server(80);
WebSocketsServer webSocket = WebSocketsServer(81);
bool bRxWebData = false; // flags for OLED animation
bool bTxWebData = false;
bool bUpdateAccessed = false; // flag used to ensure web update always starts via /update. direct accesses to /updatenow will FAIL
bool bFormatAccessed = false;
uint16_t fileCRC = 0;
int nUploadSize = 0;
long _SuppliedFileSize = 0;
void webSocketEvent(uint8_t num, WStype_t type, uint8_t * payload, size_t length);
bool checkFile(File &file);
void addTableData(String& HTML, String dta);
void rootRedirect();
String getContentType(String filename);
bool handleFileRead(String path);
void onNotFound();
void onErase();
void onFormatSPIFFS();
void onFormatNow();
void onFormatDone();
void onWMConfig();
void onResetWifi();
void onUploadBegin();
void onUploadCompletion();
void onUploadProgression();
void build404Response(String& content, String file);
void build500Response(String& content, String file);
void initWebServer(void) {
Update
.onProgress([](unsigned int progress, unsigned int total) {
int percent = (progress / (total / 100));
DebugPort.printf("Progress: %u%%\r", percent);
DebugPort.handle(); // keep telnet spy alive
ShowOTAScreen(percent, eOTAWWW); // WWW update in place
DebugPort.print("^");
});
if (MDNS.begin("Afterburner")) {
DebugPort.println("MDNS responder started");
}
server.on("/wmconfig", onWMConfig);
server.on("/resetwifi", onResetWifi);
server.on("/erase", HTTP_POST, onErase); // erase file from SPIFFS
// Magical code originally shamelessly lifted from Arduino WebUpdate example, then greatly modified
// This allows pushing new firmware to the ESP from a WEB BROWSER!
// Added authentication and a sequencing flag to ensure this is not bypassed
// You can also upload files to SPIFFS via this same portal
//
// Initial launch page
server.on("/update", HTTP_GET, onUploadBegin);
// handle attempts to browse the /updatenow path - force redirect to root
server.on("/updatenow", HTTP_GET, []() {
DebugPort.println("WEB: GET /updatenow - ILLEGAL - root redirect");
rootRedirect();
});
// valid upload attempts must use post, AND they must have also passed thru /update (bUpdateAccessed = true)
server.on("/updatenow", HTTP_POST, onUploadCompletion, onUploadProgression);
// SPIFFS formatting
server.on("/formatspiffs", HTTP_GET, onFormatSPIFFS);
server.on("/formatnow", HTTP_GET, []() { // deny browse access
DebugPort.println("WEB: GET /formatnow - ILLEGAL - root redirect");
rootRedirect();
});
server.on("/formatnow", HTTP_POST, onFormatNow); // access via POST is legal, but only if bFormatAccess == true
// NOTE: this serves the default home page, and favicon.ico
server.onNotFound([]()
{ // If the client requests any URI
if (!handleFileRead(server.uri())) { // send it if it exists
onNotFound();
}
});
server.begin();
webSocket.begin();
webSocket.onEvent(webSocketEvent);
DebugPort.println("HTTP server started");
}
// called by main sketch loop()
bool doWebServer(void)
{
webSocket.loop();
server.handleClient();
return true;
}
String getContentType(String filename) { // convert the file extension to the MIME type
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(".ico")) return "image/x-icon";
else if (filename.endsWith(".bin")) return "application/octet-stream";
return "text/plain";
}
bool handleFileRead(String path) { // send the right file to the client (if it exists)
DebugPort.println("handleFileRead: " + path);
if (path.endsWith("/")) path += "index.html"; // If a folder is requested, send the index file
String contentType = getContentType(path); // Get the MIME type
if (SPIFFS.exists(path)) { // If the file exists
File file = SPIFFS.open(path, "r"); // Open it
if(!checkFile(file)) { // check it is readable
file.close(); // if not, close the file
}
if(!file) {
DebugPort.println("\tFile exists, but could not be read?"); // dodgy file - throw error back to client
String content;
build500Response(content, path);
server.send(500, "text/html", content);
return false; // If the file is broken, return false
}
else {
server.streamFile(file, contentType); // File good, send it to the client
file.close(); // Then close the file
return true;
}
}
DebugPort.println("\tFile Not Found");
return false; // If the file doesn't exist, return false
}
const char* stdHeader = R"=====(
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<meta http-equiv="Pragma" content="no-cache">
<meta http-equiv="Expires" content="-1">
<meta http-equiv="CACHE-CONTROL" content="NO-CACHE">
</head>
<style>
body { font-family: Arial, Helvetica, sans-serif; }
th { text-align: left; }
.throb { animation: throbber 1s linear infinite; }
@keyframes throbber { 50% { opacity: 0; } }
</style>
)=====";
const char* updateIndex = R"=====(
<script>
// globals
var sendSize;
var ws;
function _(el) {
return document.getElementById(el);
}
function onWebSocket(event) {
var response = JSON.parse(event.data);
var key;
for(key in response) {
switch(key) {
case "progress":
// actual data bytes received as fed back via web socket
var bytes = response[key];
_("loaded_n_total").innerHTML = "Uploaded " + bytes + " bytes of " + sendSize;
var percent = Math.round( 100 * (bytes / sendSize));
_("progressBar").value = percent;
_("status").innerHTML = percent+"% uploaded.. please wait";
break;
}
}
}
function init() {
ws = new WebSocket('ws://' + window.location.hostname + ':81/');
ws.onmessage = onWebSocket;
}
function uploadFile() {
_("cancel").hidden = true;
var file = _("file1").files[0];
sendSize = file.size;
var JSONmsg = {};
JSONmsg['UploadSize'] = sendSize;
var str = JSON.stringify(JSONmsg);
console.log("JSON Tx:", str);
ws.send(str);
var formdata = new FormData();
formdata.append("update", file);
var ajax = new XMLHttpRequest();
// progress is handled via websocket JSON sent from controller
// using server side progress only shows the buffer filling, not actual delivery.
ajax.addEventListener("load", completeHandler, false);
ajax.addEventListener("error", errorHandler, false);
ajax.addEventListener("abort", abortHandler, false);
ajax.open("POST", "/updatenow");
ajax.send(formdata);
}
function completeHandler(event) {
_("status").innerHTML = event.target.responseText;
_("progressBar").value = 0;
_("loaded_n_total").innerHTML = "Uploaded " + sendSize + " bytes of " + sendSize;
var file = _("file1").files[0];
if(file.name.endsWith(".bin")) {
setTimeout( function() { window.location.assign('/'); }, 5000);
}
else {
setTimeout( function() { location.assign('/update'); }, 500);
}
}
function errorHandler(event) {
_("status").innerHTML = "Upload Failed";
}
function abortHandler(event) {
_("status").innerHTML = "Upload Aborted";
}
function onErase(fn) {
if(confirm('Do you really want to erase ' + fn +' ?')) {
var formdata = new FormData();
formdata.append("filename", fn);
var ajax = new XMLHttpRequest();
ajax.open("POST", "/erase");
ajax.send(formdata);
setTimeout(function () { location.reload(); }, 500);
}
}
function onBrowseChange() {
_("upload").hidden = false;
_("progressBar").hidden = false;
_("status").hidden = false;
_("loaded_n_total").hidden = false;
_("spacer").hidden = false;
}
</script>
<title>Afterburner update</title>
<body onload="javascript:init()">
<h1>Afterburner update</h1>
<form id='upload_form' method="POST" enctype="multipart/form-data" autocomplete="off">
<label for='file1'>Select a file to upload:<br></label>
<input type="file" name="file1" id="file1" size="50" onchange="onBrowseChange()"><p>
<input id="upload" type='button' onclick='uploadFile()' value='Upload' hidden>
<progress id='progressBar' value='0' max='100' style='width:300px;' hidden></progress>
<p id='spacer' hidden> </p>
<input type='button' onclick=window.location.assign('/') id='cancel' value='Cancel'>
<h3 id='status' hidden></h3>
<div id='loaded_n_total' hidden></div>
</form>
)=====";
void onWMConfig()
{
DebugPort.println("WEB: GET /wmconfig");
server.send(200, "text/plain", "Start Config Portal - Retaining credential");
DebugPort.println("Starting web portal for wifi config");
delay(500);
wifiEnterConfigPortal(true, false, 3000);
}
void onResetWifi()
{
DebugPort.println("WEB: GET /resetwifi");
server.send(200, "text/plain", "Start Config Portal - Resetting Wifi credentials!");
DebugPort.println("diconnecting client and wifi, then rebooting");
delay(500);
wifiEnterConfigPortal(true, true, 3000);
}
//<p><a href="/update"> <button type="button">Add</button></a>
//<p><a href="/"><button type="button">Home</button></a>
void onNotFound()
{
String path = server.uri();
if (path.endsWith("/")) path += "index.html"; // If a folder is requested, send the index file
String message;
build404Response(message, path);
server.send(404, "text/html", message);
}
void rootRedirect()
{
server.sendHeader("Location","/"); // reselect the update page
server.send(303);
}
bool sendWebSocketString(const char* Str)
{
// CProfile profile;
if(webSocket.connectedClients()) {
// unsigned long tCon = profile.elapsed(true);
bTxWebData = true; // OLED tx data animation flag
webSocket.broadcastTXT(Str);
// unsigned long tWeb = profile.elapsed(true);
// DebugPort.printf("Websend times : %ld,%ld\r\n", tCon, tWeb);
return true;
}
return false;
}
void webSocketEvent(uint8_t num, WStype_t type, uint8_t * payload, size_t length)
{
if (type == WStype_TEXT) {
bRxWebData = true;
char cmd[256];
memset(cmd, 0, 256);
for (int i = 0; i < length && i < 256; i++) {
cmd[i] = payload[i];
}
interpretJsonCommand(cmd); // send to the main heater controller decode routine
}
}
bool isWebSocketClientChange()
{
static int prevNumClients = -1;
int numClients = webSocket.connectedClients();
if(numClients != prevNumClients) {
prevNumClients = numClients;
DebugPort.println("Changed number of web clients, should reset JSON moderator");
return true;
}
return false;
}
bool hasWebClientSpoken(bool reset)
{
bool retval = bRxWebData;
if(reset)
bRxWebData = false;
return retval;
}
bool hasWebServerSpoken(bool reset)
{
bool retval = bTxWebData;
if(reset)
bTxWebData = false;
return retval;
}
void setUploadSize(long val)
{
_SuppliedFileSize = val;
};
// Sometimes SPIFFS gets corrupted (WTF?)
// When this happens, you can see the files exist, but you cannot read them
// This routine checks the file is readable.
// Typical failure mechanism is read returns 0, and the WifiClient upload never progresses
// The software watchdog then steps in after 15 seconds of that nonsense
bool checkFile(File &file)
{
uint8_t buf[128];
bool bOK = true;
size_t available = file.available();
while(available) {
int toRead = (available > 128) ? 128 : available;
int Read = file.read(buf, toRead);
if(Read != toRead) {
bOK = false;
DebugPort.printf("SPIFFS precautionary file check failed for %s\r\n", file.name());
break;
}
available = file.available();
}
file.seek(0);
return bOK;
}
void listSPIFFS(const char * dirname, uint8_t levels, String& HTMLreport, int withHTMLanchors)
{
char msg[128];
File root = SPIFFS.open(dirname);
if (!root) {
sprintf(msg, "Failed to open directory \"%s\"", dirname);
DebugPort.println(msg);
HTMLreport += msg; HTMLreport += "<br>";
return;
}
if (!root.isDirectory()) {
sprintf(msg, "\"%s\" is not a directory", dirname);
DebugPort.println(msg);
HTMLreport += msg; HTMLreport += "<br>";
return;
}
HTMLreport += "<hr><h3>Current SPIFFS contents:</h3>";
// create HTML table header
HTMLreport += R"=====(<table>
<tr>
<th></th>
<th style="width:200px">Name</th>
<th style="width:60px">Size</th>
<th></th>
</tr>
)=====";
File file = root.openNextFile();
while (file) {
HTMLreport += "<tr>\n";
if (file.isDirectory()) {
addTableData(HTMLreport, "DIR");
addTableData(HTMLreport, file.name());
addTableData(HTMLreport, "");
addTableData(HTMLreport, "");
sprintf(msg, " DIR : %s", file.name());
DebugPort.println(msg);
if (levels) {
listSPIFFS(file.name(), levels - 1, HTMLreport);
}
} else {
String fn = file.name();
String ers;
if(withHTMLanchors == 2)
ers = "<input type=\"button\" value=\"X\" onClick=\"onErase('" + fn + "')\">";
if(withHTMLanchors) {
if(fn.endsWith(".html") || fn.endsWith(".htm")) {
String fn2(fn);
fn = "<a href=\"" + fn2 + "\">" + fn2 + "</a>";
}
}
String sz; sz += int(file.size());
addTableData(HTMLreport, "");
addTableData(HTMLreport, fn);
addTableData(HTMLreport, sz);
addTableData(HTMLreport, ers);
sprintf(msg, " FILE: %s SIZE: %d", fn.c_str(), file.size());
DebugPort.println(msg);
}
HTMLreport += "</tr>\n";
file = root.openNextFile();
}
HTMLreport += "</table>\n";
if(withHTMLanchors) {
char usage[128];
int used = SPIFFS.usedBytes();
int total = SPIFFS.totalBytes();
float percent = used * 100. / total;
sprintf(usage, "<p><b>Usage</b><br> %d / %d bytes (%.1f%%)\n<p>", used, total, percent);
HTMLreport += usage;
}
}
void addTableData(String& HTML, String dta)
{
HTML += "<td>";
HTML += dta;
HTML += "</td>\n";
}
// erase a file from SPIFFS partition
void onErase()
{
String filename = server.arg("filename"); // get request argument value by name
if(filename.length() != 0) {
DebugPort.printf("onErase: %s ", filename.c_str());
if(SPIFFS.exists(filename.c_str())) {
SPIFFS.remove(filename.c_str());
DebugPort.println("ERASED\r\n");
}
else
DebugPort.println("NOT FOUND\r\n");
}
}
// function called upon completion of file (form) upload
void onUploadCompletion()
{
_SuppliedFileSize = 0;
DebugPort.println("WEB: POST /updatenow completion");
// completion functionality
if(SPIFFSupload) {
if(SPIFFSupload == 1) {
DebugPort.println("WEB: SPIFFS OK");
server.send(200, "text/plain", "OK - File uploaded to SPIFFS");
// javascript reselects the /update page!
}
else {
DebugPort.println("WEB: SPIFFS FAIL");
server.send(500, "text/plain", "500: couldn't create file");
}
SPIFFSupload = 0;
}
else {
if(Update.hasError()) {
DebugPort.println("WEB: UPDATE FAIL");
server.send(200, "text/plain", "FAIL - Afterburner will reboot shortly");
}
else {
DebugPort.println("WEB: UPDATE OK");
server.send(200, "text/plain", "OK - Afterburner will reboot shortly");
}
delay(1000);
// javascript redirects to root page so we go there after reboot!
forceBootInit();
ESP.restart(); // reboot
}
}
void onUploadBegin()
{
DebugPort.println("WEB: GET /update");
sCredentials creds = NVstore.getCredentials();
if (!server.authenticate(creds.webUpdateUsername, creds.webUpdatePassword)) {
return server.requestAuthentication();
}
bUpdateAccessed = true;
bFormatAccessed = false;
#ifdef USE_EMBEDDED_WEBUPDATECODE
String SPIFFSinfo;
listSPIFFS("/", 2, SPIFFSinfo, 2);
String content = stdHeader;
content += updateIndex + SPIFFSinfo;
content += "<p><button onclick=window.location.assign('/formatspiffs')>Format SPIFFS</button>";
content += "</body></html>";
server.send(200, "text/html", content );
#else
handleFileRead("/uploadfirmware.html");
#endif
}
void onUploadProgression()
{
if(bUpdateAccessed) { // only allow progression via /update, attempts to directly access /updatenow will fail
HTTPUpload& upload = server.upload();
if (upload.status == UPLOAD_FILE_START) {
String filename = upload.filename;
// CRC checking
nUploadSize = upload.totalSize;
DebugPort.setDebugOutput(true);
if(filename.endsWith(".bin")) {
DebugPort.printf("Update: %s\r\n", filename.c_str());
int sizetouse = -1; //start with max available size
if(_SuppliedFileSize) {
sizetouse = _SuppliedFileSize; // adapt to websocket supplied size
}
if (!Update.begin(sizetouse)) {
Update.printError(DebugPort);
}
}
else {
if(!filename.startsWith("/")) filename = "/"+filename;
DebugPort.printf("handleFileUpload Name: %s\r\n", filename.c_str());
fsUploadFile = SPIFFS.open(filename, "w"); // Open the file for writing in SPIFFS (create if it doesn't exist)
SPIFFSupload = fsUploadFile ? 1 : 2;
}
}
// handle file segments
else if (upload.status == UPLOAD_FILE_WRITE) {
#if USE_SW_WATCHDOG == 1
feedWatchdog(); // we get stuck here for a while, don't let the watchdog bite!
#endif
if(upload.totalSize) {
char JSON[64];
sprintf(JSON, "{\"progress\":%d}", upload.totalSize);
sendWebSocketString(JSON); // feedback proper byte count of update to browser via websocket
}
int percent = 0;
if(_SuppliedFileSize)
percent = 100 * upload.totalSize / _SuppliedFileSize;
ShowOTAScreen(percent, eOTAbrowser); // browser update
DebugPort.print(".");
if(fsUploadFile) {
fsUploadFile.write(upload.buf, upload.currentSize); // Write the received bytes to the file
}
else {
if (Update.write(upload.buf, upload.currentSize) != upload.currentSize) {
Update.printError(DebugPort);
}
}
}
// handle end of upload
else if (upload.status == UPLOAD_FILE_END) {
delay(2000);
if(SPIFFSupload) {
if(fsUploadFile) {
fsUploadFile.close(); // Close the file again
DebugPort.printf("handleFileUpload Size: %d\r\n", upload.totalSize);
}
}
else {
if(!CheckFirmwareCRC(_SuppliedFileSize))
Update.abort();
if (Update.end()) {
DebugPort.printf("Update Success: %u\r\nRebooting...\r\n", upload.totalSize);
} else {
Update.printError(DebugPort);
}
}
DebugPort.setDebugOutput(false);
bUpdateAccessed = false;
} else {
DebugPort.printf("Update Failed Unexpectedly (likely broken connection): status=%d\r\n", upload.status);
bUpdateAccessed = false;
}
}
else {
// attempt to POST without using /update - forced redirect to root
DebugPort.println("WEB: POST /updatenow forbidden entry");
rootRedirect();
}
}
/***************************************************************************************
* FORMAT SPIFFS HANDLING
*
* User must first access /formatspiffs.
* If not already authenticated, an Username/Password challenge is presented
* If that passes, bFormatAccessed is set, unlocking access to the /formatnow path
* The presneted web page offers Format and Cancel button.
* Cancel will immediatly return to the file upload path '/update'
* Format will then present a confirmation dialog, user must press Yes to proceed.
*
* Assuming Yes was pressed, a HTTP POST to /format now with the payload 'confirm'='yes' is performed
* The /formatnow handler will check that confirm does equal yes, and that bFormatAccessed was set
* If all good SPIFFS is re-formatted - no response is set.
* The javascript though from the /formatspiffs page performs a reload shortly after the post (200ms timeout)
*
* As bFormatAccessed is still set, a confimration page is the presented advising files now need to be uploaded
* A button allows direct access to /update
*/
void onFormatSPIFFS()
{
DebugPort.println("WEB: GET /formatspiffs");
bUpdateAccessed = false;
String content = stdHeader;
if(!bFormatAccessed) {
sCredentials creds = NVstore.getCredentials();
if (!server.authenticate(creds.webUpdateUsername, creds.webUpdatePassword)) {
return server.requestAuthentication();
}
bFormatAccessed = true; // only set after we pass authentication
content += formatIndex;
}
else {
bFormatAccessed = false;
content += formatDoneContent;
}
server.send(200, "text/html", content );
}
const char* formatDoneContent = R"=====(<body>
<h1>SPIFFS partition has been formatted</h1>
<h3>You must now upload the web content.</h3>
<p>Latest web content can be downloaded from <a href=\"http://www.mrjones.id.au/afterburner/firmware.html\" target=\"_blank\">http://www.mrjones.id.au/afterburner/firmware.html</a>
<h4 class="throb">Please ensure you unzip the web page content, then upload all the files contained.</h4>
<p><button onclick=window.location.assign('/update')>Upload web content</button>
</body>
</html>
)=====";
const char* formatIndex = R"=====(
<script>
function init() {
}
function onFormat() {
var formdata = new FormData();
if(confirm('Do you really want to reformat the SPIFFS partition ?')) {
formdata.append("confirm", "yes");
setTimeout(function () { location.reload(); }, 200);
}
else {
formdata.append("confirm", "no");
setTimeout(function () { location.assign('/update'); }, 200);
}
var ajax = new XMLHttpRequest();
ajax.open("POST", "/formatnow");
ajax.send(formdata);
}
</script>
<title>Afterburner SPIFFS format</title>
<body onload="javascript:init()">
<h1>Format SPIFFS partition</h1>
<h3 class="throb">CAUTION! This will erase all web content</h1>
<p><button onClick='onFormat()'>Format</button><br>
<p><a href="/update"><button>Cancel</button></a>
</body>
</html>
)=====";
void onFormatNow()
{
// HTTP POST handler, do not need to return a web page!
DebugPort.println("WEB: POST /formatnow");
String confirm = server.arg("confirm"); // get request argument value by name
if(confirm == "yes" && bFormatAccessed) { // confirm user agrees, and we did pass thru /formatspiffs first
DebugPort.println("Formatting SPIFFS partition");
SPIFFS.format(); // re-format the SPIFFS partition
}
else {
bFormatAccessed = false; // user cancelled upon last confirm popup, or not authenticated access
rootRedirect();
}
}
/***************************************************************************************
* HTTP RESPONSE 404 - FILE NOT FOUND HANDLING
*/
void build404Response(String& content, String file)
{
content += stdHeader;
content += R"=====(<body>
<h1>404: File Not Found</h1>
<p>URI: <b><i>)=====";
content += file;
content += R"=====(</i></b><br>
Method: )=====";
content += (server.method() == HTTP_GET) ? "GET" : "POST";
content += "<br>Arguments: ";
for (uint8_t i = 0; i < server.args(); i++) {
content += " " + server.argName(i) + ": " + server.arg(i) + "<br>";
}
content += R"=====(<hr>
<p>Please check the URL.<br>
If OK please try uploading the file from the web content.
<p>Latest web content can be downloaded from <a href="http://www.mrjones.id.au/afterburner/firmware.html" target="_blank">http://www.mrjones.id.au/afterburner/firmware.html</a>
<h4 class="throb">Please ensure you unzip the web page content, then upload all the files contained.</h4>
<p><a href="/update"><button>Upload web content</button></a><br>
)=====";
String SPIFFSinfo;
listSPIFFS("/", 2, SPIFFSinfo, 1);
content += SPIFFSinfo;
content += "</body>";
content += "</html>";
}
/***************************************************************************************
* HTTP RESPONSE 500 - SERVER ERROR HANDLING
*/
void build500Response(String& content, String file)
{
content = stdHeader;
content += R"=====(<body>
<h1>500: Internal Server Error</h1>
<h3 class="throb">Sorry, cannot open file</h3>
<p><b><i> ")=====";
content += file;
content += R"=====(" </i></b> exists, but cannot be streamed?
<hr>
<p>Recommended remedy is to re-format the SPIFFS partition, then reload the web content files.
<br>Latest web content can be downloaded from <a href="http://www.mrjones.id.au/afterburner/firmware.html" target="_blank">http://www.mrjones.id.au/afterburner/firmware.html</a> <i>(opens in new page)</i>.
<p>To format the SPIFFS partition, press <button onClick=location.assign('/formatspiffs')>Format SPIFFS</button>
<p>You will then need to upload each file of the web content by using the subsequent "<b>Upload</b>" button.
<hr>
<h4 class="throb">Please ensure you unzip the web page content, then upload all the files contained.</h4>
</body>
</html>
)=====";
}