Put HTTPSignatures, WebFinger and ActivityStream alongside with ActivityPub

lib/federation/activity_stream/converter/picture.ex

@@ -0,0 +1,56 @@
+defmodule Mobilizon.Federation.ActivityStream.Converter.Picture do
+  @moduledoc """
+  Picture converter.
+
+  This module allows to convert events from ActivityStream format to our own
+  internal one, and back.
+  """
+
+  alias Mobilizon.Media.Picture, as: PictureModel
+
+  @doc """
+  Convert a picture struct to an ActivityStream representation.
+  """
+  @spec model_to_as(PictureModel.t()) :: map
+  def model_to_as(%PictureModel{file: file}) do
+    %{
+      "type" => "Document",
+      "mediaType" => file.content_type,
+      "url" => file.url,
+      "name" => file.name
+    }
+  end
+
+  @doc """
+  Save picture data from raw data and return AS Link data.
+  """
+  def find_or_create_picture(%{"type" => "Link", "href" => url}, actor_id),
+    do: find_or_create_picture(url, actor_id)
+
+  def find_or_create_picture(
+        %{"type" => "Document", "url" => picture_url, "name" => name},
+        actor_id
+      )
+      when is_bitstring(picture_url) do
+    with {:ok, %HTTPoison.Response{body: body}} <- HTTPoison.get(picture_url),
+         {:ok, %{name: name, url: url, content_type: content_type, size: size}} <-
+           MobilizonWeb.Upload.store(%{body: body, name: name}),
+         {:picture_exists, nil} <- {:picture_exists, Mobilizon.Media.get_picture_by_url(url)} do
+      Mobilizon.Media.create_picture(%{
+        "file" => %{
+          "url" => url,
+          "name" => name,
+          "content_type" => content_type,
+          "size" => size
+        },
+        "actor_id" => actor_id
+      })
+    else
+      {:picture_exists, %PictureModel{file: _file} = picture} ->
+        {:ok, picture}
+
+      err ->
+        err
+    end
+  end
+end