[#963] No redirect on OOB OAuth authorize request with existing authorization. OAuth-related refactoring.

lib/pleroma/helpers/uri_helper.ex

@@ -0,0 +1,27 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Helpers.UriHelper do
+  def append_uri_params(uri, appended_params) do
+    uri = URI.parse(uri)
+    appended_params = for {k, v} <- appended_params, into: %{}, do: {to_string(k), v}
+    existing_params = URI.query_decoder(uri.query || "") |> Enum.into(%{})
+    updated_params_keys = Enum.uniq(Map.keys(existing_params) ++ Map.keys(appended_params))
+
+    updated_params =
+      for k <- updated_params_keys, do: {k, appended_params[k] || existing_params[k]}
+
+    uri
+    |> Map.put(:query, URI.encode_query(updated_params))
+    |> URI.to_string()
+  end
+
+  def append_param_if_present(%{} = params, param_name, param_value) do
+    if param_value do
+      Map.put(params, param_name, param_value)
+    else
+      params
+    end
+  end
+end