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