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- # Pleroma: A lightweight social networking server
- # Copyright © 2017-2021 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)
-
- [
- {:meta,
- [
- property: "og:title",
- content: Utils.user_name_string(user)
- ], []},
- {:meta, [property: "og:url", content: url], []},
- {:meta,
- [
- property: "og:description",
- content: scrubbed_content
- ], []},
- {:meta, [property: "og:type", content: "article"], []}
- ] ++
- 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: "article"], []},
- {: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: 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:alt", content: attachment["name"]], []}
- | acc
- ]
- |> maybe_add_dimensions(url)
-
- "video" ->
- [
- {:meta, [property: "og:video", content: Utils.attachment_url(url["href"])], []}
- | acc
- ]
- |> maybe_add_dimensions(url)
-
- _ ->
- acc
- end
- end)
-
- acc ++ rendered_tags
- end)
- end
-
- defp build_attachments(_), do: []
-
- # We can use url["mediaType"] to dynamically fill the metadata
- defp maybe_add_dimensions(metadata, url) do
- type = url["mediaType"] |> String.split("/") |> List.first()
-
- cond do
- !is_nil(url["height"]) && !is_nil(url["width"]) ->
- metadata ++
- [
- {:meta, [property: "og:#{type}:width", content: "#{url["width"]}"], []},
- {:meta, [property: "og:#{type}:height", content: "#{url["height"]}"], []}
- ]
-
- true ->
- metadata
- end
- end
- end
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