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

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# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Metadata.Providers.OpenGraph do
alias Pleroma.Web.Metadata.Providers.Provider
alias Pleroma.{HTML, Formatter, User}
alias Pleroma.Web.MediaProxy
@behaviour Provider
@impl Provider
def build_tags(%{activity: activity, user: user}) do
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with truncated_content = scrub_html_and_truncate(activity) do
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attachments = build_attachments(activity)
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[
{:meta,
[
property: "og:title",
content: user_name_string(user)
], []},
{:meta, [property: "og:url", content: activity.data["id"]], []},
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{:meta, [property: "og:description", content: truncated_content], []}
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] ++
if attachments == [] or
Enum.any?(activity.data["object"]["tag"], fn tag -> tag == "nsfw" end) do
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[
{:meta, [property: "og:image", content: attachment_url(User.avatar_url(user))], []},
{:meta, [property: "og:image:width", content: 120], []},
{:meta, [property: "og:image:height", content: 120], []}
]
else
attachments
end
end
end
@impl Provider
def build_tags(%{user: user}) do
with truncated_bio = scrub_html_and_truncate(user.bio || "") do
[
{:meta,
[
property: "og:title",
content: user_name_string(user)
], []},
{:meta, [property: "og:url", content: User.profile_url(user)], []},
{:meta, [property: "og:description", content: truncated_bio], []},
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{:meta, [property: "og:image", content: attachment_url(User.avatar_url(user))], []},
{:meta, [property: "og:image:width", content: 120], []},
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{:meta, [property: "og:image:height", content: 120], []}
]
end
end
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defp build_attachments(%{data: %{"object" => %{"attachment" => attachments}}} = _activity) do
Enum.reduce(attachments, [], fn attachment, acc ->
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rendered_tags =
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Enum.reduce(attachment["url"], [], fn url, acc ->
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media_type =
Enum.find(["image", "audio", "video"], fn media_type ->
String.starts_with?(url["mediaType"], media_type)
end)
if media_type do
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[
{:meta, [property: "og:" <> media_type, content: attachment_url(url["href"])], []}
| acc
]
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else
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acc
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end
end)
acc ++ rendered_tags
end)
end
defp scrub_html_and_truncate(%{data: %{"object" => %{"content" => content}}} = activity) do
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content
# html content comes from DB already encoded, decode first and scrub after
|> HtmlEntities.decode()
|> String.replace(~r/<br\s?\/?>/, " ")
|> HTML.get_cached_stripped_html_for_object(activity, __MODULE__)
|> Formatter.truncate()
end
defp scrub_html_and_truncate(content) when is_binary(content) do
content
# html content comes from DB already encoded, decode first and scrub after
|> HtmlEntities.decode()
|> String.replace(~r/<br\s?\/?>/, " ")
|> HTML.strip_tags()
|> Formatter.truncate()
end
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defp attachment_url(url) do
MediaProxy.url(url)
end
defp user_name_string(user) do
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"#{user.name} " <>
if user.local do
"(@#{user.nickname}@#{Pleroma.Web.Endpoint.host()})"
else
"(@#{user.nickname})"
end
end
end