FIX: Reset the 'upload_error' variable after web file upload error (#20340)

* FIX: Reset the 'upload_error' variable after signaling the error to enable the next upload action.

* ADD: Introduce HandleUploadUFSDone() to display information messages for uploaded files in UFS and handle errors.
ADD: Include '?fsz=' web-argument (filesize) in the upload button click function.

tasmota/tasmota_xdrv_driver/xdrv_01_9_webserver.ino

@@ -2777,7 +2777,10 @@ void HandleUploadLoop(void) {
   if (UPLOAD_FILE_START == upload.status) {
     Web.upload_error = 0;
     upload_error_signalled = false;
-    upload_size = 0;
+    char tmp[16];
+    
+    WebGetArg("fsz", tmp, sizeof(tmp));                    // filesize
+    upload_size = (!strlen(tmp)) ? 0 : atoi(tmp);
 
     UploadServices(0);
 
@@ -2785,18 +2788,25 @@ void HandleUploadLoop(void) {
       Web.upload_error = 1;  // No file selected
       return;
     }
-    SettingsSave(1);  // Free flash for upload
 
-    AddLog(LOG_LEVEL_INFO, PSTR(D_LOG_UPLOAD D_FILE " %s"), upload.filename.c_str());
+    AddLog(LOG_LEVEL_INFO, PSTR(D_LOG_UPLOAD D_FILE " %s (%d bytes)"), upload.filename.c_str(), upload_size);
 
 #ifdef USE_UFILESYS
     if (UPL_UFSFILE == Web.upload_file_type) {
+      const uint32_t freeBytes = (UfsFree() * 1024);
+      if (upload_size > freeBytes) {
+        Web.upload_error = 9;   // File too large
+        return;
+      }
+
       if (!UfsUploadFileOpen(upload.filename.c_str())) {
-        Web.upload_error = 2;
+        Web.upload_error = 2;   // Not enough space
         return;
       }
     }
 #endif  // USE_UFILESYS
+
+    SettingsSave(1);  // Free flash for upload
   }
 
   // ***** Step2: Write upload file
@@ -2890,7 +2900,7 @@ void HandleUploadLoop(void) {
       Web.config_block_count++;
     }
 #ifdef USE_UFILESYS
-    else if (UPL_UFSFILE == Web.upload_file_type) {
+    else if (!Web.upload_error && UPL_UFSFILE == Web.upload_file_type) {
       if (!UfsUploadFileWrite(upload.buf, upload.currentSize)) {
         Web.upload_error = 9;  // File too large
         return;
@@ -2925,7 +2935,7 @@ void HandleUploadLoop(void) {
       }
     }
 #ifdef USE_UFILESYS
-    else if (UPL_UFSFILE == Web.upload_file_type) {
+    else if (!Web.upload_error && UPL_UFSFILE == Web.upload_file_type) {
       UfsUploadFileClose();
     }
 #endif  // USE_UFILESYS

tasmota/tasmota_xdrv_driver/xdrv_50_filesystem.ino

@@ -803,9 +803,11 @@ const char UFS_FORM_FILE_UPGc2[] PROGMEM =
   "</div>";
 
 const char UFS_FORM_FILE_UPG[] PROGMEM =
-  "<form method='post' action='ufsu' enctype='multipart/form-data'>"
+  "<form method='post' action='ufsu?fsz=' enctype='multipart/form-data'>"
   "<br><input type='file' name='ufsu'><br>"
-  "<br><button type='submit' onclick='eb(\"f1\").style.display=\"none\";eb(\"f2\").style.display=\"block\";this.form.submit();'>" D_UPLOAD "</button></form>"
+  "<br><button type='submit' "
+  "onclick='eb(\"f1\").style.display=\"none\";eb(\"but6\").style.display=\"none\";eb(\"f2\").style.display=\"block\";this.form.action+=this.form[\"ufsu\"].files[0].size;this.form.submit();'"
+  ">" D_UPLOAD "</button></form>"
   "<br><hr>";
 const char UFS_FORM_SDC_DIRa[] PROGMEM =
   "<div style='text-align:left;overflow:auto;height:250px;'>";
@@ -858,6 +860,40 @@ const char HTTP_EDITOR_FORM_END[] PROGMEM =
 
 #endif  // #ifdef GUI_EDIT_FILE
 
+void HandleUploadUFSDone(void) {
+  if (!HttpCheckPriviledgedAccess()) { return; }
+
+  HTTPUpload& upload = Webserver->upload();
+
+  AddLog(LOG_LEVEL_DEBUG, PSTR(D_LOG_HTTP D_UPLOAD_DONE));
+
+  WifiConfigCounter();
+  UploadServices(1);
+
+  WSContentStart_P(PSTR(D_INFORMATION));
+
+  WSContentSendStyle();
+  WSContentSend_P(PSTR("<div style='text-align:center;'><b>" D_UPLOAD " <font color='#"));
+  if (Web.upload_error) {
+    WSContentSend_P(PSTR("%06x'>" D_FAILED "</font></b><br><br>"), WebColor(COL_TEXT_WARNING));
+    char error[100];
+    if (Web.upload_error < 10) {
+      GetTextIndexed(error, sizeof(error), Web.upload_error -1, kUploadErrors);
+    } else {
+      snprintf_P(error, sizeof(error), PSTR(D_UPLOAD_ERROR_CODE " %d"), Web.upload_error);
+    }
+    WSContentSend_P(error);
+    Web.upload_error = 0;
+  } else {
+    WSContentSend_P(PSTR("%06x'>" D_SUCCESSFUL "</font></b><br>"), WebColor(COL_TEXT_SUCCESS));
+  }
+  WSContentSend_P(PSTR("</div><br>"));
+
+  XdrvCall(FUNC_WEB_ADD_MANAGEMENT_BUTTON);
+
+  WSContentStop();
+}
+
 void UfsDirectory(void) {
   if (!HttpCheckPriviledgedAccess()) { return; }
 
@@ -1457,7 +1493,8 @@ bool Xdrv50(uint32_t function) {
 //      Webserver->on(F("/ufsu"), HTTP_POST,[](){Webserver->sendHeader(F("Location"),F("/ufsu"));Webserver->send(303);}, HandleUploadLoop);
       Webserver->on("/ufsd", UfsDirectory);
       Webserver->on("/ufsu", HTTP_GET, UfsDirectory);
-      Webserver->on("/ufsu", HTTP_POST,[](){Webserver->sendHeader(F("Location"),F("/ufsu"));Webserver->send(303);}, HandleUploadLoop);
+      //Webserver->on("/ufsu", HTTP_POST,[](){Webserver->sendHeader(F("Location"),F("/ufsu"));Webserver->send(303);}, HandleUploadLoop);
+      Webserver->on("/ufsu", HTTP_POST, HandleUploadUFSDone, HandleUploadLoop);
 #ifdef GUI_EDIT_FILE
       Webserver->on("/ufse", HTTP_GET, UfsEditor);
       Webserver->on("/ufse", HTTP_POST, UfsEditorUpload);