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

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Elixir
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defimpl Mobilizon.Service.Metadata, for: Mobilizon.Events.Event do
alias Phoenix.HTML
alias Phoenix.HTML.Tag
alias Mobilizon.Events.Event
alias Mobilizon.Service.Formatter.HTML, as: HTMLFormatter
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alias Mobilizon.Web.JsonLD.ObjectView
alias Mobilizon.Web.MediaProxy
import Mobilizon.Web.Gettext
def build_tags(%Event{} = event, locale \\ "en") do
event = Map.put(event, :description, process_description(event.description, locale))
tags = [
Tag.content_tag(:title, event.title <> " - Mobilizon"),
Tag.tag(:meta, name: "description", content: event.description),
Tag.tag(:meta, property: "og:title", content: event.title),
Tag.tag(:meta, property: "og:url", content: event.url),
Tag.tag(:meta, property: "og:description", content: event.description),
Tag.tag(:meta, property: "og:type", content: "website"),
# Tell Search Engines what's the origin
Tag.tag(:link, rel: "canonical", href: event.url)
]
tags =
if is_nil(event.picture) do
tags
else
tags ++
[
Tag.tag(:meta,
property: "og:image",
content: event.picture.file.url |> MediaProxy.url()
)
]
end
tags ++
[
Tag.tag(:meta, property: "twitter:card", content: "summary_large_image"),
~s{<script type="application/ld+json">#{json(event)}</script>} |> HTML.raw()
]
end
defp process_description(nil, locale), do: process_description("", locale)
defp process_description("", locale) do
Gettext.put_locale(locale)
gettext("The event organizer didn't add any description.")
end
defp process_description(description, _locale) do
description
|> HTMLFormatter.strip_tags()
|> String.slice(0..200)
|> (&"#{&1}").()
end
# Insert JSON-LD schema by hand because Tag.content_tag wants to escape it
defp json(%Event{title: title} = event) do
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"event.json"
|> ObjectView.render(%{event: %{event | title: HTMLFormatter.strip_tags(title)}})
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|> Jason.encode!()
end
end