forked from potsda.mn/mobilizon
95 lines
2.9 KiB
Elixir
95 lines
2.9 KiB
Elixir
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defmodule Mobilizon.Service.Feed do
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@moduledoc """
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Serve Atom Syndication Feeds
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"""
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alias Mobilizon.Actors
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alias Mobilizon.Actors.Actor
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alias Mobilizon.Events
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alias Mobilizon.Events.Event
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alias Atomex.{Feed, Entry}
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import MobilizonWeb.Gettext
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alias MobilizonWeb.Router.Helpers, as: Routes
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alias MobilizonWeb.Endpoint
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@version Mix.Project.config()[:version]
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def version(), do: @version
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@spec create_cache(String.t()) :: {:commit, String.t()} | {:ignore, any()}
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def create_cache("actor_" <> name) do
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with {:ok, res} <- fetch_actor_event_feed(name) do
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{:commit, res}
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else
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err ->
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{:ignore, err}
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end
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end
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@spec fetch_actor_event_feed(String.t()) :: String.t()
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defp fetch_actor_event_feed(name) do
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with %Actor{} = actor <- Actors.get_local_actor_by_name(name),
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{:ok, events, _count} <- Events.get_public_events_for_actor(actor) do
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{:ok, build_actor_feed(actor, events)}
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else
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err ->
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{:error, err}
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end
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end
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# Build an atom feed from actor and it's public events
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@spec build_actor_feed(Actor.t(), list()) :: String.t()
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defp build_actor_feed(%Actor{} = actor, events) do
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display_name = Actor.display_name(actor)
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self_url = Routes.feed_url(Endpoint, :actor, actor.preferred_username, "atom") |> URI.decode()
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# Title uses default instance language
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feed =
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Feed.new(
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self_url,
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DateTime.utc_now(),
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gettext("%{actor}'s public events feed", actor: display_name)
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)
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|> Feed.author(display_name, uri: actor.url)
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|> Feed.link(self_url, rel: "self")
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|> Feed.link(actor.url, rel: "alternate")
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|> Feed.generator("Mobilizon", uri: "https://joinmobilizon.org", version: version())
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|> Feed.entries(Enum.map(events, &get_entry/1))
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feed = if actor.avatar_url, do: Feed.icon(feed, actor.avatar_url), else: feed
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feed =
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if actor.banner_url,
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do: Feed.logo(feed, actor.banner_url),
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else: feed
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feed
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|> Feed.build()
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|> Atomex.generate_document()
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end
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# Create an entry for the Atom feed
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@spec get_entry(Event.t()) :: any()
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defp get_entry(%Event{} = event) do
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with {:ok, html, []} <- Earmark.as_html(event.description) do
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entry =
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Entry.new(event.url, event.inserted_at, event.title)
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|> Entry.link(event.url, rel: "alternate", type: "text/html")
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|> Entry.content({:cdata, html}, type: "html")
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entry = if event.publish_at, do: Entry.published(entry, event.publish_at), else: entry
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# Add tags
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entry =
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event.tags
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|> Enum.uniq()
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|> Enum.reduce(entry, fn tag, acc -> Entry.category(acc, tag.slug, label: tag.title) end)
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Entry.build(entry)
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else
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{:error, _html, error_messages} ->
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require Logger
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Logger.error("Unable to produce HTML for Markdown", details: inspect(error_messages))
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end
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end
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end
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