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.Addresses.Address
alias Mobilizon.Events.Event
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alias Mobilizon.Web.JsonLD.ObjectView
import Mobilizon.Service.Metadata.Utils,
only: [process_description: 2, strip_tags: 1, datetime_to_string: 2, render_address: 1]
def build_tags(%Event{} = event, locale \\ "en") do
formatted_description = description(event, locale)
tags = [
Tag.content_tag(:title, event.title <> " - Mobilizon"),
Tag.tag(:meta, name: "description", content: process_description(event.description, locale)),
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: formatted_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
)
]
end
tags ++
[
Tag.tag(:meta, property: "twitter:card", content: "summary_large_image"),
~s{<script type="application/ld+json">#{json(event)}</script>} |> HTML.raw()
]
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: strip_tags(title)}})
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|> Jason.encode!()
end
defp description(
%Event{
description: description,
begins_on: begins_on,
physical_address: %Address{} = address
},
locale
) do
"#{datetime_to_string(begins_on, locale)} - #{render_address(address)} - #{process_description(description, locale)}"
end
defp description(
%Event{
description: description,
begins_on: begins_on
},
locale
) do
"#{datetime_to_string(begins_on, locale)} - #{process_description(description, locale)}"
end
end