package.path = package.path .. ';<SCRIPT_PATH>/?.lua';

-- https://stackoverflow.com/questions/4990990/check-if-a-file-exists-with-lua
local function file_exists(name)
   local f = io.open(name,"r")
   if f~=nil then io.close(f) return true else return false end
end


local file_to_check = string.match(ngx.var.request_uri, ".*/(.*)")
local file_dir = ngx.var.tmp_file_dir
local fullpath = file_dir .. "/" .. file_to_check .. ".jpeg";
ngx.log(ngx.INFO, "FILE TO CHECK -> ", fullpath)
ngx.say(file_exists(fullpath))