use uuid to generate filename (#7)

prod/upload/upload.lua

@@ -7,7 +7,7 @@ local cjson     = require "cjson"
 local chunk_size = 4096
 local form = upload:new(chunk_size)
 -- local sha1 = resty_sha1:new()
-
+uuid.seed()
 ngx.say("...FILE UPLOAD...")
 
 local file
@@ -21,7 +21,7 @@ while true do
 
     if typ == "header" then
         -- local file_name = my_get_file_name(res)
-        local file_name = "/tmp/foo.jpeg" -- todo moicen: use uuid() to generate file name.
+        local file_name = string.format("/tmp/%s.jpeg", uuid())
         ngx.say("...CREATE FILE....")
         if file_name then
             file = io.open(file_name, "w+")