135 lines
4.6 KiB
Elixir
135 lines
4.6 KiB
Elixir
# Pleroma: A lightweight social networking server
|
|
|
|
# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
|
|
# SPDX-License-Identifier: AGPL-3.0-only
|
|
|
|
defmodule Pleroma.Web.Metadata.Providers.TwitterCard do
|
|
alias Pleroma.User
|
|
alias Pleroma.Web.MediaProxy
|
|
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(%{activity_id: id, object: object, user: user}) do
|
|
attachments = build_attachments(id, object)
|
|
scrubbed_content = Utils.scrub_html_and_truncate(object)
|
|
|
|
[
|
|
title_tag(user),
|
|
{:meta, [property: "twitter:description", content: scrubbed_content], []}
|
|
] ++
|
|
if attachments == [] or Metadata.activity_nsfw?(object) do
|
|
[
|
|
image_tag(user),
|
|
{:meta, [property: "twitter:card", content: "summary"], []}
|
|
]
|
|
else
|
|
attachments
|
|
end
|
|
end
|
|
|
|
@impl Provider
|
|
def build_tags(%{user: user}) do
|
|
with truncated_bio = Utils.scrub_html_and_truncate(user.bio) do
|
|
[
|
|
title_tag(user),
|
|
{:meta, [property: "twitter:description", content: truncated_bio], []},
|
|
image_tag(user),
|
|
{:meta, [property: "twitter:card", content: "summary"], []}
|
|
]
|
|
end
|
|
end
|
|
|
|
defp title_tag(user) do
|
|
{:meta, [property: "twitter:title", content: Utils.user_name_string(user)], []}
|
|
end
|
|
|
|
def image_tag(user) do
|
|
{:meta, [property: "twitter:image", content: MediaProxy.preview_url(User.avatar_url(user))],
|
|
[]}
|
|
end
|
|
|
|
defp build_attachments(id, %{data: %{"attachment" => attachments}}) do
|
|
Enum.reduce(attachments, [], fn attachment, acc ->
|
|
rendered_tags =
|
|
Enum.reduce(attachment["url"], [], fn url, acc ->
|
|
case Utils.fetch_media_type(@media_types, url["mediaType"]) do
|
|
"audio" ->
|
|
[
|
|
{:meta, [property: "twitter:card", content: "player"], []},
|
|
{:meta, [property: "twitter:player:width", content: "480"], []},
|
|
{:meta, [property: "twitter:player:height", content: "80"], []},
|
|
{:meta, [property: "twitter:player", content: player_url(id)], []}
|
|
| acc
|
|
]
|
|
|
|
# Not using preview_url for this. It saves bandwidth, but the image dimensions will
|
|
# be wrong. We generate it on the fly and have no way to capture or analyze the
|
|
# image to get the dimensions. This can be an issue for apps/FEs rendering images
|
|
# in timelines too, but you can get clever with the aspect ratio metadata as a
|
|
# workaround.
|
|
"image" ->
|
|
[
|
|
{:meta, [property: "twitter:card", content: "summary_large_image"], []},
|
|
{:meta,
|
|
[
|
|
property: "twitter:player",
|
|
content: MediaProxy.url(url["href"])
|
|
], []}
|
|
| acc
|
|
]
|
|
|> maybe_add_dimensions(url)
|
|
|
|
"video" ->
|
|
# fallback to old placeholder values
|
|
height = url["height"] || 480
|
|
width = url["width"] || 480
|
|
|
|
[
|
|
{:meta, [property: "twitter:card", content: "player"], []},
|
|
{:meta, [property: "twitter:player", content: player_url(id)], []},
|
|
{:meta, [property: "twitter:player:width", content: "#{width}"], []},
|
|
{:meta, [property: "twitter:player:height", content: "#{height}"], []},
|
|
{:meta, [property: "twitter:player:stream", content: MediaProxy.url(url["href"])],
|
|
[]},
|
|
{:meta,
|
|
[property: "twitter:player:stream:content_type", content: url["mediaType"]], []}
|
|
| acc
|
|
]
|
|
|
|
_ ->
|
|
acc
|
|
end
|
|
end)
|
|
|
|
acc ++ rendered_tags
|
|
end)
|
|
end
|
|
|
|
defp build_attachments(_id, _object), do: []
|
|
|
|
defp player_url(id) do
|
|
Pleroma.Web.Router.Helpers.o_status_url(Pleroma.Web.Endpoint, :notice_player, id)
|
|
end
|
|
|
|
# Videos have problems without dimensions, but we used to not provide WxH for images.
|
|
# A default (read: incorrect) fallback for images is likely to cause rendering bugs.
|
|
defp maybe_add_dimensions(metadata, url) do
|
|
cond do
|
|
!is_nil(url["height"]) && !is_nil(url["width"]) ->
|
|
metadata ++
|
|
[
|
|
{:meta, [property: "twitter:player:width", content: "#{url["width"]}"], []},
|
|
{:meta, [property: "twitter:player:height", content: "#{url["height"]}"], []}
|
|
]
|
|
|
|
true ->
|
|
metadata
|
|
end
|
|
end
|
|
end
|