Implement public actor ICS endpoint and event ICS export

Closes #83 and #84

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/mobilizon_web/controllers/feed_controller.ex

@@ -17,4 +17,32 @@ defmodule MobilizonWeb.FeedController do
         |> send_file(404, "priv/static/index.html")
     end
   end
+
+  def actor(conn, %{"name" => name, "format" => "ics"}) do
+    with {status, data} when status in [:ok, :commit] <-
+           Cachex.fetch(:ics, "actor_" <> name) do
+      conn
+      |> put_resp_content_type("text/calendar")
+      |> send_resp(200, data)
+    else
+      _err ->
+        conn
+        |> put_resp_content_type("text/html")
+        |> send_file(404, "priv/static/index.html")
+    end
+  end
+
+  def event(conn, %{"uuid" => uuid, "format" => "ics"}) do
+    with {status, data} when status in [:ok, :commit] <-
+           Cachex.fetch(:ics, "event_" <> uuid) do
+      conn
+      |> put_resp_content_type("text/calendar")
+      |> send_resp(200, data)
+    else
+      _err ->
+        conn
+        |> put_resp_content_type("text/html")
+        |> send_file(404, "priv/static/index.html")
+    end
+  end
 end