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+# 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