feat: add per-user cookie generation

src/libs/utils.lua

@@ -15,5 +15,29 @@ function _M.resolve_fqdn(fqdn)
     return result:gsub("\n", "")
 end
 
+function _M.generate_secret(args)
+    --[[ args: {
+    --       context: enum(applet, txn),
+    --       mode: enum('service', 'action')
+    --   }
+    --]]
+    local context = args.context
+    local mode = args.mode or "service"
+
+    local ip = context.sf:src() or ""
+
+    local hostname = _M.get_hostname() or ""
+
+    local user_agent
+    if mode == "service" then
+        user_agent = context.headers['user-agent'] or {}
+        user_agent = user_agent[0]
+    else
+        user_agent = context.sf:req_hdr('user-agent') or ""
+    end
+
+    return context.sc:xxh32(ip .. hostname .. user_agent)
+end
+
 return _M