Move API under GraphQL context

lib/graphql/api/follows.ex

@@ -0,0 +1,71 @@
+defmodule Mobilizon.GraphQL.API.Follows do
+  @moduledoc """
+  Common API for following, unfollowing, accepting and rejecting stuff.
+  """
+
+  alias Mobilizon.Actors
+  alias Mobilizon.Actors.{Actor, Follower}
+
+  alias Mobilizon.Federation.ActivityPub
+  alias Mobilizon.Federation.ActivityPub.Activity
+
+  require Logger
+
+  def follow(%Actor{} = follower, %Actor{} = followed) do
+    case ActivityPub.follow(follower, followed) do
+      {:ok, activity, follow} ->
+        {:ok, activity, follow}
+
+      e ->
+        Logger.warn("Error while following actor: #{inspect(e)}")
+        {:error, e}
+    end
+  end
+
+  def unfollow(%Actor{} = follower, %Actor{} = followed) do
+    case ActivityPub.unfollow(follower, followed) do
+      {:ok, activity, follow} ->
+        {:ok, activity, follow}
+
+      e ->
+        Logger.warn("Error while unfollowing actor: #{inspect(e)}")
+        {:error, e}
+    end
+  end
+
+  def accept(%Actor{} = follower, %Actor{} = followed) do
+    Logger.debug("We're trying to accept a follow")
+
+    with %Follower{approved: false} = follow <-
+           Actors.is_following(follower, followed),
+         {:ok, %Activity{} = activity, %Follower{approved: true} = follow} <-
+           ActivityPub.accept(
+             :follow,
+             follow,
+             true
+           ) do
+      {:ok, activity, follow}
+    else
+      %Follower{approved: true} ->
+        {:error, "Follow already accepted"}
+    end
+  end
+
+  def reject(%Actor{} = follower, %Actor{} = followed) do
+    Logger.debug("We're trying to reject a follow")
+
+    with %Follower{} = follow <-
+           Actors.is_following(follower, followed),
+         {:ok, %Activity{} = activity, %Follower{} = follow} <-
+           ActivityPub.reject(
+             :follow,
+             follow,
+             true
+           ) do
+      {:ok, activity, follow}
+    else
+      %Follower{approved: true} ->
+        {:error, "Follow already accepted"}
+    end
+  end
+end