forked from AkkomaGang/akkoma
148 lines
4.9 KiB
Elixir
148 lines
4.9 KiB
Elixir
# 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.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(%{
|
|
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: MediaProxy.preview_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: MediaProxy.preview_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: MediaProxy.url(url["href"])], []}
|
|
| 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: "og:image", content: MediaProxy.url(url["href"])], []},
|
|
{:meta, [property: "og:image:alt", content: attachment["name"]], []}
|
|
| acc
|
|
]
|
|
|> maybe_add_dimensions(url)
|
|
|
|
"video" ->
|
|
[
|
|
{:meta, [property: "og:video", content: MediaProxy.url(url["href"])], []}
|
|
| acc
|
|
]
|
|
|> maybe_add_dimensions(url)
|
|
|> maybe_add_video_thumbnail(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
|
|
|
|
# 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 ++
|
|
[
|
|
{: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
|