add validation for empty file uploads with appropriate error message

cmd/media.go

@@ -66,6 +66,12 @@ func handleMediaUpload(r *fastglue.Request) error {
 	srcFileSize := fileHeader.Size
 	srcExt := strings.TrimPrefix(strings.ToLower(filepath.Ext(srcFileName)), ".")
 
+	// Check if file is empty
+	if srcFileSize == 0 {
+		app.lo.Error("error: uploaded file is empty (0 bytes)")
+		return r.SendErrorEnvelope(fasthttp.StatusBadRequest, app.i18n.T("media.fileEmpty"), nil, envelope.InputError)
+	}
+
 	// Check file size
 	consts := app.consts.Load().(*constants)
 	if bytesToMegabytes(srcFileSize) > float64(consts.MaxFileUploadSizeMB) {

i18n/en.json

@@ -332,6 +332,7 @@
   "user.errorGeneratingPasswordToken": "Error generating password token",
   "media.fileSizeTooLarge": "File size too large, please upload a file less than {size} ",
   "media.fileTypeNotAllowed": "File type not allowed",
+  "media.fileEmpty": "This file is 0 bytes, so it will not be attached.",
   "inbox.emptyIMAP": "Empty IMAP config",
   "inbox.emptySMTP": "Empty SMTP config",
   "template.defaultTemplateAlreadyExists": "Default template already exists",