Export an event though ics

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

lib/eventos/export/icalendar.ex

@@ -0,0 +1,19 @@
+defmodule Eventos.Export.ICalendar do
+  @moduledoc """
+  Export an event to iCalendar format
+  """
+
+  alias Eventos.Events.Event
+
+  @spec export_event(%Event{}) :: String
+  def export_event(%Event{} = event) do
+    events = [%ICalendar.Event{
+      summary: event.title,
+      dtstart: event.begins_on,
+      dtend: event.ends_on,
+      description: event.description
+    }]
+    %ICalendar{events: events}
+    |> ICalendar.to_ics()
+  end
+end

lib/eventos_web/controllers/event_controller.ex

@@ -6,6 +6,7 @@ defmodule EventosWeb.EventController do
 
   alias Eventos.Events
   alias Eventos.Events.Event
+  alias Eventos.Export.ICalendar
 
   action_fallback EventosWeb.FallbackController
 
@@ -28,6 +29,13 @@ defmodule EventosWeb.EventController do
     render(conn, "show.json", event: event)
   end
 
+  def export_to_ics(conn, %{"id" => id}) do
+    event = id
+      |> Events.get_event!()
+      |> ICalendar.export_event()
+    send_resp(conn, 200, event)
+  end
+
   def update(conn, %{"id" => id, "event" => event_params}) do
     event = Events.get_event!(id)
 

lib/eventos_web/router.ex

@@ -44,6 +44,7 @@ defmodule EventosWeb.Router do
      resources "/users", UserController, except: [:new, :edit, :show]
      resources "/accounts", AccountController, except: [:new, :edit]
      resources "/events", EventController
+     get "/events/:id/ics", EventController, :export_to_ics
      resources "/categories", CategoryController
      resources "/tags", TagController
      resources "/event_accounts", EventAccountsController