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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Helpers.UriHelper do
   6   def append_uri_params(uri, appended_params) do
   7     uri = URI.parse(uri)
   8     appended_params = for {k, v} <- appended_params, into: %{}, do: {to_string(k), v}
   9     existing_params = URI.query_decoder(uri.query || "") |> Enum.into(%{})
  10     updated_params_keys = Enum.uniq(Map.keys(existing_params) ++ Map.keys(appended_params))
  11
  12     updated_params =
  13       for k <- updated_params_keys, do: {k, appended_params[k] || existing_params[k]}
  14
  15     uri
  16     |> Map.put(:query, URI.encode_query(updated_params))
  17     |> URI.to_string()
  18   end
  19
  20   def append_param_if_present(%{} = params, param_name, param_value) do
  21     if param_value do
  22       Map.put(params, param_name, param_value)
  23     else
  24       params
  25     end
  26   end
  27
  28   def maybe_add_base("/" <> uri, base), do: Path.join([base, uri])
  29   def maybe_add_base(uri, _base), do: uri
  30 end