akkoma/lib/pleroma/web/metadata.ex

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Elixir
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defmodule Pleroma.Web.Metadata do
alias Phoenix.HTML
alias Pleroma.{Formatter, User}
alias Pleroma.Web.MediaProxy
def build_tags(params) do
if(meta_enabled?(:opengraph), do: opengraph_tags(params), else: [])
|> Enum.map(&to_tag/1)
|> Enum.map(&HTML.safe_to_string/1)
|> Enum.join("\n")
end
def meta_enabled?(type) do
Pleroma.Config.get([:metadata, type], false)
end
# opengraph for single status
defp opengraph_tags(%{activity: activity, user: user}) do
with truncated_content = scrub_html_and_truncate(activity.data["object"]["content"]) do
[
{:meta,
[
property: "og:title",
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content:
"#{user.name}" <>
if user.local do
"(@#{user.nickname}@{pleroma_domain})"
else
"(@#{user.nickname})"
end
], []},
{:meta, [property: "og:url", content: activity.data["id"]], []},
{:meta, [property: "og:description", content: truncated_content], []},
{:meta, [property: "og:image", content: user_avatar_url(user)], []},
{:meta, [property: "og:image:width", content: 120], []},
{:meta, [property: "og:image:height", content: 120], []},
{:meta, [property: "twitter:card", content: "summary"], []}
]
end
end
# opengraph for user card
defp opengraph_tags(%{user: user}) do
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with truncated_bio = scrub_html_and_truncate(user.bio || "") do
[
{:meta,
[
property: "og:title",
content: "#{user.name} (@#{user.nickname}@#{pleroma_domain()}) profile"
], []},
{:meta, [property: "og:url", content: User.profile_url(user)], []},
{:meta, [property: "og:description", content: truncated_bio], []},
{:meta, [property: "og:image", content: user_avatar_url(user)], []},
{:meta, [property: "og:image:width", content: 120], []},
{:meta, [property: "og:image:height", content: 120], []},
{:meta, [property: "twitter:card", content: "summary"], []}
]
end
end
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defp opengraph_tags(_) do
[]
end
def to_tag(data) do
with {name, attrs, _content = []} <- data do
HTML.Tag.tag(name, attrs)
else
{name, attrs, content} ->
HTML.Tag.content_tag(name, content, attrs)
_ ->
raise ArgumentError, message: "make_tag invalid args"
end
end
defp scrub_html_and_truncate(content) do
content
# html content comes from DB already encoded, decode first and scrub after
|> HtmlEntities.decode()
|> Pleroma.HTML.strip_tags()
|> Formatter.truncate()
end
defp user_avatar_url(user) do
User.avatar_url(user) |> MediaProxy.url()
end
def pleroma_domain do
Pleroma.Web.Endpoint.host()
end
end