akkoma/lib/pleroma/web/metadata/twitter_card.ex

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defmodule Pleroma.Web.Metadata.Providers.TwitterCard do
alias Pleroma.Web.Metadata.Providers.Provider
@behaviour Provider
@impl Provider
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def build_tags(%{activity: activity}) do
if Enum.any?(activity.data["object"]["tag"], fn tag -> tag == "nsfw" end) or
activity.data["object"]["attachment"] == [] do
build_tags(nil)
else
case find_first_acceptable_media_type(activity) do
"image" ->
[{:meta, [property: "twitter:card", content: "summary_large_image"], []}]
"audio" ->
[{:meta, [property: "twitter:card", content: "player"], []}]
"video" ->
[{:meta, [property: "twitter:card", content: "player"], []}]
_ ->
build_tags(nil)
end
end
end
@impl Provider
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def build_tags(_) do
[{:meta, [property: "twitter:card", content: "summary"], []}]
end
def find_first_acceptable_media_type(%{data: %{"object" => %{"attachment" => attachment}}}) do
Enum.find_value(attachment, fn attachment ->
Enum.find_value(attachment["url"], fn url ->
Enum.find(["image", "audio", "video"], fn media_type ->
String.starts_with?(url["mediaType"], media_type)
end)
end)
end)
end
end