akkoma/lib/pleroma/web/metadata/providers/open_graph.ex

168 lines
5 KiB
Elixir
Raw Normal View History

# 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
2019-02-09 15:16:26 +00:00
alias Pleroma.User
alias Pleroma.Web.MediaProxy
2019-02-09 15:16:26 +00:00
alias Pleroma.Web.Metadata
2019-02-06 19:20:02 +00:00
alias Pleroma.Web.Metadata.Providers.Provider
alias Pleroma.Web.Metadata.Utils
@behaviour Provider
2019-07-12 16:42:54 +00:00
@media_types ["image", "audio", "video"]
defp user_avatar_tags(user) do
if Utils.visible?(user) do
[
{:meta, [property: "og:image", content: MediaProxy.preview_url(User.avatar_url(user))],
[]},
{:meta, [property: "og:image:width", content: 150], []},
{:meta, [property: "og:image:height", content: 150], []}
]
else
[]
end
end
@impl Provider
def build_tags(%{
object: object,
url: url,
user: user
}) do
attachments =
if Utils.visible?(object) do
build_attachments(object)
else
[]
end
scrubbed_content =
if Utils.visible?(object) do
Utils.scrub_html_and_truncate(object)
else
"Content cannot be displayed."
end
2019-01-15 18:20:27 +00:00
2019-01-16 15:02:46 +00:00
[
{:meta,
[
property: "og:title",
content: Utils.user_name_string(user)
2019-01-16 15:02:46 +00:00
], []},
{:meta, [property: "og:url", content: url], []},
2019-01-17 06:18:46 +00:00
{:meta,
[
property: "og:description",
content: scrubbed_content
2019-01-17 06:18:46 +00:00
], []},
{:meta, [property: "og:type", content: "article"], []}
2019-01-16 15:02:46 +00:00
] ++
if attachments == [] or Metadata.activity_nsfw?(object) do
user_avatar_tags(user)
2019-01-16 15:02:46 +00:00
else
attachments
end
end
@impl Provider
def build_tags(%{user: user}) do
if Utils.visible?(user) do
truncated_bio = Utils.scrub_html_and_truncate(user.bio)
[
{: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"], []}
] ++ user_avatar_tags(user)
else
[]
end
end
defp build_attachments(%{data: %{"attachment" => attachments}}) do
2019-01-16 13:52:01 +00:00
Enum.reduce(attachments, [], fn attachment, acc ->
2019-01-15 18:17:56 +00:00
rendered_tags =
2019-01-16 13:52:01 +00:00
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.
2019-07-12 16:42:54 +00:00
case Utils.fetch_media_type(@media_types, url["mediaType"]) do
2019-01-17 06:18:46 +00:00
"audio" ->
[
{:meta, [property: "og:audio", content: MediaProxy.url(url["href"])], []}
2019-01-17 06:18:46 +00:00
| acc
]
2021-06-09 16:09:14 +00:00
# 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
2021-06-09 16:58:51 +00:00
# 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.
2019-01-17 06:18:46 +00:00
"image" ->
[
{:meta, [property: "og:image", content: MediaProxy.url(url["href"])], []},
{:meta, [property: "og:image:alt", content: attachment["name"]], []}
2019-01-17 06:18:46 +00:00
| acc
]
|> maybe_add_dimensions(url)
2019-01-17 06:18:46 +00:00
"video" ->
[
{:meta, [property: "og:video", content: MediaProxy.url(url["href"])], []}
2019-01-17 06:18:46 +00:00
| acc
]
|> maybe_add_dimensions(url)
|> maybe_add_video_thumbnail(url)
2019-01-17 06:18:46 +00:00
_ ->
acc
2019-01-15 18:17:56 +00:00
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
# Media Preview Proxy makes thumbnails of videos without resizing, so we can trust the
# width and height of the source video.
defp maybe_add_video_thumbnail(metadata, url) do
cond do
Pleroma.Config.get([:media_preview_proxy, :enabled], false) ->
metadata ++
2021-06-09 16:06:53 +00:00
[
{:meta, [property: "og:image:width", content: "#{url["width"]}"], []},
{:meta, [property: "og:image:height", content: "#{url["height"]}"], []},
{:meta, [property: "og:image", content: MediaProxy.preview_url(url["href"])], []}
]
true ->
metadata
end
end
end