# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1613222052 -3600
# Node ID 6b687210975b83c4821dbedc4d652355d9d59333
# Parent  5b8aec0609f004ba66fd20f6cdfd8f1b9692ffc5
mod_http_file_share: Prevent attempt to upload again after completion

diff -r 5b8aec0609f0 -r 6b687210975b plugins/mod_http_file_share.lua
--- a/plugins/mod_http_file_share.lua	Sat Feb 13 14:06:46 2021 +0100
+++ b/plugins/mod_http_file_share.lua	Sat Feb 13 14:14:12 2021 +0100
@@ -224,6 +224,15 @@
 
 	local filename = get_filename(upload_info.slot, true);
 
+	do
+		-- check if upload has been completed already
+		-- we want to allow retry of a failed upload attempt, but not after it's been completed
+		local f = io.open(filename, "r");
+		if f then
+			f:close();
+			return 409;
+		end
+	end
 
 	if not request.body_sink then
 		module:log("debug", "Preparing to receive upload into %q, expecting %s", filename, B(upload_info.filesize));