Added OPML Endpoint for podcast rss feeds (#512)

* Added OPML Endpoint for podcast rss feeds

* changed opml route and added controller test for opml endpoint

* add copy opml feed button

* add copy opml feed button - correct url

* fix html indenting

* add indentation to opml

Co-authored-by: Kieran <kieran.eglin@gmail.com>

* use convention for unused controller params

Co-authored-by: Kieran <kieran.eglin@gmail.com>

* add test for opml_sources helper function

* change opml endpoint to be more inline with the other routes

---------

Co-authored-by: robs <git@robs.social>
Co-authored-by: Kieran <kieran.eglin@gmail.com>

test/pinchflat/podcasts/opml_feed_builder_test.exs

@@ -0,0 +1,34 @@
+defmodule Pinchflat.Podcasts.OpmlFeedBuilderTest do
+  use Pinchflat.DataCase
+
+  import Pinchflat.SourcesFixtures
+
+  alias Pinchflat.Podcasts.OpmlFeedBuilder
+
+  setup do
+    source = source_fixture()
+
+    {:ok, source: source}
+  end
+
+  describe "build/2" do
+    test "returns an XML document", %{source: source} do
+      res = OpmlFeedBuilder.build("http://example.com", [source])
+
+      assert String.contains?(res, ~s(<?xml version="1.0" encoding="UTF-8"?>))
+    end
+
+    test "escapes illegal characters" do
+      source = source_fixture(%{custom_name: "A & B"})
+      res = OpmlFeedBuilder.build("http://example.com", [source])
+
+      assert String.contains?(res, ~s(A &amp; B))
+    end
+
+    test "build podcast link with URL base", %{source: source} do
+      res = OpmlFeedBuilder.build("http://example.com", [source])
+
+      assert String.contains?(res, ~s(http://example.com/sources/#{source.uuid}/feed.xml))
+    end
+  end
+end

test/pinchflat/podcasts/podcast_helpers_test.exs

@@ -6,6 +6,16 @@ defmodule Pinchflat.Podcasts.PodcastHelpersTest do
 
   alias Pinchflat.Podcasts.PodcastHelpers
 
+  describe "opml_sources" do
+    test "returns sources not marked for deletion" do
+      source = source_fixture()
+      source_fixture(%{marked_for_deletion_at: DateTime.utc_now()})
+      assert [found_source] = PodcastHelpers.opml_sources()
+      assert found_source.custom_name == source.custom_name
+      assert found_source.uuid == source.uuid
+    end
+  end
+
   describe "persisted_media_items_for/2" do
     test "returns media items with files that exist on-disk" do
       source = source_fixture()