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diff --git a/lib/pleroma/helpers/uri_helper.ex b/lib/pleroma/helpers/uri_helper.ex
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+++ b/lib/pleroma/helpers/uri_helper.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Helpers.UriHelper do
+  def modify_uri_params(uri, overridden_params, deleted_params \\ []) do
+    uri = URI.parse(uri)
+
+    existing_params = URI.query_decoder(uri.query || "") |> Map.new()
+    overridden_params = Map.new(overridden_params, fn {k, v} -> {to_string(k), v} end)
+    deleted_params = Enum.map(deleted_params, &to_string/1)
+
+    updated_params =
+      existing_params
+      |> Map.merge(overridden_params)
+      |> Map.drop(deleted_params)
+
+    uri
+    |> Map.put(:query, URI.encode_query(updated_params))
+    |> URI.to_string()
+    |> String.replace_suffix("?", "")
+  end
+
+  def maybe_add_base("/" <> uri, base), do: Path.join([base, uri])
+  def maybe_add_base(uri, _base), do: uri
+end