lua: ensure that PATH_INFO starts with a slash

When calculating the matching prefix length, make sure to not take the trailing
slash into account in order to ensure that the resulting PATH_INFO string
always starts with a slash.

This ensures that an url like "/foo" against the matching prefix "/" or
"/foo/bar" against "/foo/" result in "/foo" and "/bar" respectively.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 4 insertions, 0 deletions

diff --git a/lua.c b/lua.c
index 2134904..3efe22b 100644
--- a/lua.c
+++ b/lua.c
@@ -222,6 +222,10 @@ static void lua_main(struct client *cl, struct path_info *pi, char *url)
 			pi->query = str + 1;
 		path_len = str - url;
 	}
+
+	if (prefix_len > 0 && conf.lua_prefix[prefix_len - 1] == '/')
+		prefix_len--;
+
 	if (path_len > prefix_len) {
 		lua_pushlstring(L, url + prefix_len,
 				path_len - prefix_len);