Disable Hackney URL encoding function

Hackney interferes with out URI encoding and implements older RFC 2396
instead of RFC 3986 which we and Elixir implement. As an example "'"
and "!" will get encoded by it and cause problems with our MediaProxy
making unexpected 302 redirects.

If an admin supplies a different function via *.secret.exs, we
don't override it.

https://github.com/benoitc/hackney/issues/399

lib/pleroma/http/adapter_helper/hackney.ex

@@ -16,7 +16,12 @@ defmodule Pleroma.HTTP.AdapterHelper.Hackney do
 
     config_opts = Pleroma.Config.get([:http, :adapter], [])
 
+    url_encoding =
+      Keyword.new()
+      |> Keyword.put(:path_encode_fun, fn path -> path end)
+
     @defaults
+    |> Keyword.merge(url_encoding)
     |> Keyword.merge(config_opts)
     |> Keyword.merge(connection_opts)
     |> add_scheme_opts(uri)

lib/pleroma/reverse_proxy/client/hackney.ex

@@ -7,6 +7,11 @@ defmodule Pleroma.ReverseProxy.Client.Hackney do
 
   @impl true
   def request(method, url, headers, body, opts \\ []) do
+    opts =
+      Keyword.put_new(opts, :path_encode_fun, fn path ->
+        path
+      end)
+
     :hackney.request(method, url, headers, body, opts)
   end