version chapril de mobilizon https://mobilizon.chapril.org/
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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, EventOptions}
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
"event.json"
|> ObjectView.render(%{event: %{event | title: strip_tags(title)}})
|> Jason.encode!()
end
defp description(
%Event{
description: description,
begins_on: begins_on,
physical_address: address,
options: %EventOptions{timezone: timezone},
language: language
},
locale
) do
language = build_language(language, locale)
begins_on = build_begins_on(begins_on, timezone)
begins_on
|> datetime_to_string(language)
|> (&[&1]).()
|> add_timezone(begins_on)
|> maybe_build_address(address)
|> build_description(description, language)
|> Enum.join(" - ")
end
@spec build_language(String.t() | nil, String.t()) :: String.t()
defp build_language(language, locale), do: language || locale
@spec build_begins_on(DateTime.t(), String.t() | nil) :: DateTime.t()
defp build_begins_on(begins_on, timezone) do
if timezone do
case DateTime.shift_zone(begins_on, timezone) do
{:ok, begins_on} -> begins_on
{:error, _err} -> begins_on
end
else
begins_on
end
end
defp add_timezone(elements, %DateTime{} = begins_on) do
elements ++ [Cldr.DateTime.Formatter.zone_gmt(begins_on)]
end
@spec maybe_build_address(list(String.t()), Address.t() | nil) :: list(String.t())
defp maybe_build_address(elements, %Address{} = address) do
elements ++ [render_address(address)]
end
defp maybe_build_address(elements, _address), do: elements
@spec build_description(list(String.t()), String.t(), String.t()) :: list(String.t())
defp build_description(elements, description, language) do
elements ++ [process_description(description, language)]
end
end