Merge branch 'features/mastoapi-cards' into 'develop'

MastoAPI: Add Rich-Media support

See merge request pleroma/pleroma!664

3 files changed, 39 insertions, 1 deletions

diff --git a/lib/pleroma/html.ex b/lib/pleroma/html.ex
index f5c6e5033..fb602d6b6 100644
--- a/lib/pleroma/html.ex
+++ b/lib/pleroma/html.ex
@@ -58,6 +58,20 @@ defmodule Pleroma.HTML do
       "#{signature}#{to_string(scrubber)}"
     end)
   end
+
+  def extract_first_external_url(object, content) do
+    key = "URL|#{object.id}"
+
+    Cachex.fetch!(:scrubber_cache, key, fn _key ->
+      result =
+        content
+        |> Floki.filter_out("a.mention")
+        |> Floki.attribute("a", "href")
+        |> Enum.at(0)
+
+      {:commit, result}
+    end)
+  end
 end
 
 defmodule Pleroma.HTML.Scrubber.TwitterText do
diff --git a/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex b/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
index f4736fcb5..a60532b55 100644
--- a/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
+++ b/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
@@ -6,6 +6,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   use Pleroma.Web, :controller
   alias Pleroma.{Repo, Object, Activity, User, Notification, Stats}
   alias Pleroma.Web
+  alias Pleroma.HTML
 
   alias Pleroma.Web.MastodonAPI.{
     StatusView,
@@ -1322,6 +1323,29 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
     end
   end
 
+  def get_status_card(status_id) do
+    with %Activity{} = activity <- Repo.get(Activity, status_id),
+         true <- ActivityPub.is_public?(activity),
+         %Object{} = object <- Object.normalize(activity.data["object"]),
+         page_url <- HTML.extract_first_external_url(object, object.data["content"]),
+         {:ok, rich_media} <- Pleroma.Web.RichMedia.Parser.parse(page_url) do
+      page_url = rich_media[:url] || page_url
+      site_name = rich_media[:site_name] || URI.parse(page_url).host
+
+      rich_media
+      |> Map.take([:image, :title, :description])
+      |> Map.put(:type, "link")
+      |> Map.put(:provider_name, site_name)
+      |> Map.put(:url, page_url)
+    else
+      _ -> %{}
+    end
+  end
+
+  def status_card(conn, %{"id" => status_id}) do
+    json(conn, get_status_card(status_id))
+  end
+
   def try_render(conn, target, params)
       when is_binary(target) do
     res = render(conn, target, params)
diff --git a/lib/pleroma/web/router.ex b/lib/pleroma/web/router.ex
index b83790858..e749aa834 100644
--- a/lib/pleroma/web/router.ex
+++ b/lib/pleroma/web/router.ex
@@ -258,7 +258,7 @@ defmodule Pleroma.Web.Router do
 
     get("/statuses/:id", MastodonAPIController, :get_status)
     get("/statuses/:id/context", MastodonAPIController, :get_context)
-    get("/statuses/:id/card", MastodonAPIController, :empty_object)
+    get("/statuses/:id/card", MastodonAPIController, :status_card)
     get("/statuses/:id/favourited_by", MastodonAPIController, :favourited_by)
     get("/statuses/:id/reblogged_by", MastodonAPIController, :reblogged_by)