User: Add raw_bio, storing unformatted bio

Related: https://git.pleroma.social/pleroma/pleroma/issues/1643

priv/repo/migrations/20200322174133_user_raw_bio.exs

@@ -0,0 +1,9 @@
+defmodule Pleroma.Repo.Migrations.UserRawBio do
+  use Ecto.Migration
+
+  def change do
+    alter table(:users) do
+      add_if_not_exists(:raw_bio, :text)
+    end
+  end
+end

priv/repo/migrations/20200328193433_populate_user_raw_bio.exs

@@ -0,0 +1,25 @@
+defmodule Pleroma.Repo.Migrations.PopulateUserRawBio do
+  use Ecto.Migration
+  import Ecto.Query
+  alias Pleroma.User
+  alias Pleroma.Repo
+
+  def change do
+    {:ok, _} = Application.ensure_all_started(:fast_sanitize)
+
+    User.Query.build(%{local: true})
+    |> select([u], struct(u, [:id, :ap_id, :bio]))
+    |> Repo.stream()
+    |> Enum.each(fn %{bio: bio} = user ->
+      if bio do
+        raw_bio =
+          bio
+          |> String.replace(~r(<br */?>), "\n")
+          |> Pleroma.HTML.strip_tags()
+
+        Ecto.Changeset.cast(user, %{raw_bio: raw_bio}, [:raw_bio])
+        |> Repo.update()
+      end
+    end)
+  end
+end