add localstorage clearer, sessionstorage cleaer, and cachebuster modifiers

proxychain/requestmodifiers/add_cache_buster_query.go

@@ -0,0 +1,28 @@
+package requestmodifiers
+
+import (
+	"ladder/proxychain"
+	"math/rand"
+)
+
+// AddCacheBusterQuery modifies query params to add a random parameter key
+// In order to get the upstream network stack to serve a fresh copy of the page.
+func AddCacheBusterQuery() proxychain.RequestModification {
+	return func(chain *proxychain.ProxyChain) error {
+		chain.AddOnceRequestModifications(
+			ModifyQueryParams("ord", randomString(15)),
+		)
+
+		return nil
+	}
+}
+
+func randomString(length int) string {
+	const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789."
+
+	b := make([]byte, length)
+	for i := range b {
+		b[i] = charset[rand.Intn(len(charset))]
+	}
+	return string(b)
+}