Merge branch 'features/bio_rel_me' into 'develop'

Add rel=me to the User bio

Closes #423

See merge request pleroma/pleroma!813

lib/pleroma/user.ex

@@ -22,6 +22,7 @@ defmodule Pleroma.User do
   alias Pleroma.Web.OAuth
   alias Pleroma.Web.ActivityPub.Utils
   alias Pleroma.Web.ActivityPub.ActivityPub
+  alias Pleroma.Web.RelMe
 
   require Logger
 
@@ -1232,8 +1233,14 @@ defmodule Pleroma.User do
         {String.trim(name, ":"), url}
       end)
 
+    # TODO: get profile URLs other than user.ap_id
+    profile_urls = [user.ap_id]
+
     bio
-    |> CommonUtils.format_input("text/plain", mentions_format: :full)
+    |> CommonUtils.format_input("text/plain",
+      mentions_format: :full,
+      rel: &RelMe.maybe_put_rel_me(&1, profile_urls)
+    )
     |> elem(0)
     |> Formatter.emojify(emoji)
   end

lib/pleroma/web/rel_me.ex

@@ -0,0 +1,51 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.RelMe do
+  @hackney_options [
+    pool: :media,
+    timeout: 2_000,
+    recv_timeout: 2_000,
+    max_body: 2_000_000
+  ]
+
+  if Mix.env() == :test do
+    def parse(url) when is_binary(url), do: parse_url(url)
+  else
+    def parse(url) when is_binary(url) do
+      Cachex.fetch!(:rel_me_cache, url, fn _ ->
+        {:commit, parse_url(url)}
+      end)
+    rescue
+      e -> {:error, "Cachex error: #{inspect(e)}"}
+    end
+  end
+
+  def parse(_), do: {:error, "No URL provided"}
+
+  defp parse_url(url) do
+    {:ok, %Tesla.Env{body: html}} = Pleroma.HTTP.get(url, [], adapter: @hackney_options)
+
+    data =
+      Floki.attribute(html, "link[rel=me]", "href") ++ Floki.attribute(html, "a[rel=me]", "href")
+
+    {:ok, data}
+  rescue
+    e -> {:error, "Parsing error: #{inspect(e)}"}
+  end
+
+  def maybe_put_rel_me("http" <> _ = target_page, profile_urls) when is_list(profile_urls) do
+    {:ok, rel_me_hrefs} = parse(target_page)
+
+    true = Enum.any?(rel_me_hrefs, fn x -> x in profile_urls end)
+
+    "me"
+  rescue
+    _ -> nil
+  end
+
+  def maybe_put_rel_me(_, _) do
+    nil
+  end
+end