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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.ReverseProxy.Client.Hackney do
+  @behaviour Pleroma.ReverseProxy.Client
+
+  # redirect handler from Pleb, slightly modified to work with Hackney
+  # https://declin.eu/objects/d4f38e62-5429-4614-86d1-e8fc16e6bf33
+  # seven years without upstream fix!
+  # https://github.com/benoitc/hackney/issues/273
+  @redirect_statuses [301, 302, 303, 307, 308]
+  defp get_location(headers) do
+    location =
+      Enum.find(headers, fn {header, _location} ->
+        String.downcase(header) == "location"
+      end)
+
+    elem(location, 1)
+  end
+
+  @impl true
+  def request(method, url, headers, body, opts \\ []) do
+    if opts[:follow_redirect] != false do
+      {_state, req_opts} = Access.get_and_update(opts, :follow_redirect, fn a -> {a, false} end)
+      res = :hackney.request(method, url, headers, body, req_opts)
+
+      case res do
+        {:ok, code, reply_headers, _client} when code in @redirect_statuses ->
+          :hackney.request(method, get_location(reply_headers), headers, body, req_opts)
+
+        {:ok, code, reply_headers} when code in @redirect_statuses ->
+          :hackney.request(method, get_location(reply_headers), headers, body, req_opts)
+
+        _ ->
+          res
+      end
+    else
+      :hackney.request(method, url, headers, body, opts)
+    end
+  end
+
+  @impl true
+  def stream_body(ref) do
+    case :hackney.stream_body(ref) do
+      :done -> :done
+      {:ok, data} -> {:ok, data, ref}
+      {:error, error} -> {:error, error}
+    end
+  end
+
+  @impl true
+  def close(ref), do: :hackney.close(ref)
+end