debianize-mobilizon/lib/service/metadata/actor.ex

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Elixir
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defimpl Mobilizon.Service.Metadata, for: Mobilizon.Actors.Actor do
alias Phoenix.HTML
alias Phoenix.HTML.Tag
alias Mobilizon.Actors.Actor
alias Mobilizon.Web.JsonLD.ObjectView
use Mobilizon.Web, :verified_routes
import Mobilizon.Service.Metadata.Utils,
only: [process_description: 2, default_description: 1, escape_text: 1]
import Mobilizon.Web.Gettext
def build_tags(_actor, _locale \\ "en")
def build_tags(%Actor{type: :Group} = group, locale) do
default_desc = default_description(locale)
group =
Map.update(group, :summary, default_desc, fn summary ->
process_description(summary, locale)
end)
[
Tag.tag(:meta, property: "og:title", content: actor_display_name_escaped(group)),
Tag.tag(:meta,
property: "og:url",
content: ~p"/@#{Actor.preferred_username_and_domain(group)}" |> url() |> URI.decode()
),
Tag.tag(:meta, property: "og:description", content: group.summary),
Tag.tag(:meta, property: "og:type", content: "profile"),
Tag.tag(:meta,
property: "profile:username",
content: group |> Actor.preferred_username_and_domain() |> escape_text()
),
Tag.tag(:meta, property: "twitter:card", content: "summary"),
Tag.tag(:meta, property: "twitter:site", content: "@joinmobilizon")
]
|> maybe_add_avatar(group)
|> add_group_schema(group)
|> add_group_feeds(group)
|> add_canonical(group)
|> maybe_add_no_index(group)
end
def build_tags(%Actor{} = _actor, _locale), do: []
@spec maybe_add_avatar(list(Tag.t()), Actor.t()) :: list(Tag.t())
defp maybe_add_avatar(tags, actor) do
if is_nil(actor.avatar) do
tags
else
tags ++
[Tag.tag(:meta, property: "og:image", content: actor.avatar.url)]
end
end
@spec add_group_schema(list(Tag.t()), Actor.t()) :: list(Tag.t())
defp add_group_schema(tags, %Actor{} = group) do
breadcrumbs = %{
"@context" => "https://schema.org",
"@type" => "BreadcrumbList",
"itemListElement" => [
%{
"@type" => "ListItem",
"position" => 1,
"name" => actor_display_name_escaped(group)
}
]
}
tags ++
[
~s{<script type="application/ld+json">#{Jason.encode!(breadcrumbs)}</script>}
|> HTML.raw(),
~s{<script type="application/ld+json">#{json(group)}</script>} |> HTML.raw()
]
end
@spec add_group_feeds(list(Tag.t()), Actor.t()) :: list(Tag.t())
defp add_group_feeds(tags, %Actor{} = group) do
tags ++
[
Tag.tag(:link,
rel: "alternate",
type: "application/atom+xml",
title: gettext("%{name}'s feed", name: actor_display_name_escaped(group)) |> HTML.raw(),
href:
~p"/@#{Actor.preferred_username_and_domain(group)}/feed/atom" |> url() |> URI.decode()
),
Tag.tag(:link,
rel: "alternate",
type: "text/calendar",
title: gettext("%{name}'s feed", name: actor_display_name_escaped(group)) |> HTML.raw(),
href:
~p"/@#{Actor.preferred_username_and_domain(group)}/feed/ics" |> url() |> URI.decode()
),
Tag.tag(:link,
rel: "alternate",
type: "application/activity+json",
href: group.url
)
]
end
@spec add_canonical(list(Tag.t()), Actor.t()) :: list(Tag.t())
defp add_canonical(tags, %Actor{url: group_url}) do
tags ++ [Tag.tag(:link, rel: "canonical", href: group_url)]
end
@spec maybe_add_no_index(list(Tag.t()), Actor.t()) :: list(Tag.t())
defp maybe_add_no_index(tags, %Actor{domain: nil}), do: tags
defp maybe_add_no_index(tags, %Actor{}) do
tags ++ [Tag.tag(:meta, name: "robots", content: "noindex")]
end
# Insert JSON-LD schema by hand because Tag.content_tag wants to escape it
defp json(%Actor{} = group) do
"group.json"
|> ObjectView.render(%{group: group})
|> Jason.encode!()
end
defp actor_display_name_escaped(actor) do
actor
|> Actor.display_name()
|> escape_text()
end
end