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Diffstat (limited to 'lib/pleroma/web/metadata/providers/open_graph.ex')
-rw-r--r-- | lib/pleroma/web/metadata/providers/open_graph.ex | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/lib/pleroma/web/metadata/providers/open_graph.ex b/lib/pleroma/web/metadata/providers/open_graph.ex new file mode 100644 index 000000000..bb1b23208 --- /dev/null +++ b/lib/pleroma/web/metadata/providers/open_graph.ex @@ -0,0 +1,119 @@ +# Pleroma: A lightweight social networking server +# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/> +# SPDX-License-Identifier: AGPL-3.0-only + +defmodule Pleroma.Web.Metadata.Providers.OpenGraph do + alias Pleroma.User + alias Pleroma.Web.Metadata + alias Pleroma.Web.Metadata.Providers.Provider + alias Pleroma.Web.Metadata.Utils + + @behaviour Provider + @media_types ["image", "audio", "video"] + + @impl Provider + def build_tags(%{ + object: object, + url: url, + user: user + }) do + attachments = build_attachments(object) + scrubbed_content = Utils.scrub_html_and_truncate(object) + # Zero width space + content = + if scrubbed_content != "" and scrubbed_content != "\u200B" do + ": “" <> scrubbed_content <> "”" + else + "" + end + + # Most previews only show og:title which is inconvenient. Instagram + # hacks this by putting the description in the title and making the + # description longer prefixed by how many likes and shares the post + # has. Here we use the descriptive nickname in the title, and expand + # the full account & nickname in the description. We also use the cute^Wevil + # smart quotes around the status text like Instagram, too. + [ + {:meta, + [ + property: "og:title", + content: "#{user.name}" <> content + ], []}, + {:meta, [property: "og:url", content: url], []}, + {:meta, + [ + property: "og:description", + content: "#{Utils.user_name_string(user)}" <> content + ], []}, + {:meta, [property: "og:type", content: "website"], []} + ] ++ + if attachments == [] or Metadata.activity_nsfw?(object) do + [ + {:meta, [property: "og:image", content: Utils.attachment_url(User.avatar_url(user))], + []}, + {:meta, [property: "og:image:width", content: 150], []}, + {:meta, [property: "og:image:height", content: 150], []} + ] + else + attachments + end + end + + @impl Provider + def build_tags(%{user: user}) do + with truncated_bio = Utils.scrub_html_and_truncate(user.bio) do + [ + {:meta, + [ + property: "og:title", + content: Utils.user_name_string(user) + ], []}, + {:meta, [property: "og:url", content: user.uri || user.ap_id], []}, + {:meta, [property: "og:description", content: truncated_bio], []}, + {:meta, [property: "og:type", content: "website"], []}, + {:meta, [property: "og:image", content: Utils.attachment_url(User.avatar_url(user))], []}, + {:meta, [property: "og:image:width", content: 150], []}, + {:meta, [property: "og:image:height", content: 150], []} + ] + end + end + + defp build_attachments(%{data: %{"attachment" => attachments}}) do + Enum.reduce(attachments, [], fn attachment, acc -> + rendered_tags = + Enum.reduce(attachment["url"], [], fn url, acc -> + # TODO: Add additional properties to objects when we have the data available. + # Also, Whatsapp only wants JPEG or PNGs. It seems that if we add a second og:image + # object when a Video or GIF is attached it will display that in Whatsapp Rich Preview. + case Utils.fetch_media_type(@media_types, url["mediaType"]) do + "audio" -> + [ + {:meta, [property: "og:audio", content: Utils.attachment_url(url["href"])], []} + | acc + ] + + "image" -> + [ + {:meta, [property: "og:image", content: Utils.attachment_url(url["href"])], []}, + {:meta, [property: "og:image:width", content: 150], []}, + {:meta, [property: "og:image:height", content: 150], []} + | acc + ] + + "video" -> + [ + {:meta, [property: "og:video", content: Utils.attachment_url(url["href"])], []} + | acc + ] + + _ -> + acc + end + end) + + acc ++ rendered_tags + end) + end + + defp build_attachments(_), do: [] +end |