forked from potsda.mn/mobilizon
345 lines
11 KiB
Elixir
345 lines
11 KiB
Elixir
defmodule Mobilizon.Federation.ActivityStream.Converter.Event do
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@moduledoc """
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Event converter.
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This module allows to convert events from ActivityStream format to our own
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internal one, and back.
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"""
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alias Mobilizon.Actors.Actor
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alias Mobilizon.Addresses.Address
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alias Mobilizon.Events.Categories
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alias Mobilizon.Events.Event, as: EventModel
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alias Mobilizon.Medias.Media
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alias Mobilizon.Federation.ActivityStream.{Converter, Convertible}
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alias Mobilizon.Federation.ActivityStream.Converter.Address, as: AddressConverter
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alias Mobilizon.Federation.ActivityStream.Converter.EventMetadata, as: EventMetadataConverter
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alias Mobilizon.Federation.ActivityStream.Converter.Media, as: MediaConverter
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alias Mobilizon.Service.TimezoneDetector
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alias Mobilizon.Web.Endpoint
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import Mobilizon.Federation.ActivityPub.Utils, only: [get_url: 1]
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import Mobilizon.Federation.ActivityStream.Converter.Utils,
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only: [
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fetch_tags: 1,
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fetch_mentions: 1,
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build_tags: 1,
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maybe_fetch_actor_and_attributed_to_id: 1,
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process_pictures: 2,
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get_address: 1,
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fetch_actor: 1
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]
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require Logger
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@behaviour Converter
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defimpl Convertible, for: EventModel do
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alias Mobilizon.Federation.ActivityStream.Converter.Event, as: EventConverter
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defdelegate model_to_as(event), to: EventConverter
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end
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@online_address_name "Website"
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@banner_picture_name "Banner"
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@ap_public "https://www.w3.org/ns/activitystreams#Public"
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@doc """
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Converts an AP object data to our internal data structure.
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"""
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@impl Converter
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@spec as_to_model_data(map) :: map() | {:error, atom()}
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def as_to_model_data(object) do
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case maybe_fetch_actor_and_attributed_to_id(object) do
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{:ok, %Actor{id: actor_id}, attributed_to} ->
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address = get_address(object["location"])
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tags = fetch_tags(object["tag"])
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mentions = fetch_mentions(object["tag"])
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visibility = get_visibility(object)
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options = get_options(object, address)
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metadata = get_metdata(object)
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contacts = get_contacts(object)
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[description: description, picture_id: picture_id, medias: medias] =
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process_pictures(object, actor_id)
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%{
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title: object["name"],
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description: description,
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organizer_actor_id: actor_id,
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attributed_to_id: if(is_nil(attributed_to), do: nil, else: attributed_to.id),
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picture_id: picture_id,
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medias: medias,
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begins_on: object["startTime"],
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ends_on: object["endTime"],
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category: Categories.get_category(object["category"]),
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visibility: visibility,
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join_options: Map.get(object, "joinMode", "free"),
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local: is_local?(object["id"]),
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external_participation_url: object["externalParticipationUrl"],
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options: options,
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metadata: metadata,
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# Remove fallback in MBZ 5.x
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status:
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object
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|> Map.get("status", Map.get(object, "ical:status", "CONFIRMED"))
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|> String.downcase(),
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online_address: object |> Map.get("attachment", []) |> get_online_address(),
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phone_address: object["phoneAddress"],
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draft: object["draft"] == true,
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url: object["id"],
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uuid: object["uuid"],
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tags: tags,
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mentions: mentions,
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physical_address_id: if(address, do: address.id, else: nil),
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updated_at: object["updated"],
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publish_at: object["published"],
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language: object["inLanguage"],
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contacts: contacts
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}
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{:error, err} ->
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{:error, err}
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end
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end
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@doc """
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Convert an event struct to an ActivityStream representation.
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"""
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@impl Converter
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@spec model_to_as(EventModel.t()) :: map
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def model_to_as(%EventModel{} = event) do
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{to, cc} =
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if event.visibility == :public,
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do: {[@ap_public], [event.organizer_actor.followers_url]},
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else: {[attributed_to_or_default(event).followers_url], [@ap_public]}
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participant_count = Mobilizon.Events.count_participant_participants(event.id)
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%{
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"type" => "Event",
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"to" => to,
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"cc" => cc,
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"attributedTo" => attributed_to_or_default(event).url,
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"name" => event.title,
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"actor" =>
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if(Ecto.assoc_loaded?(event.organizer_actor), do: event.organizer_actor.url, else: nil),
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"uuid" => event.uuid,
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"category" => event.category,
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"content" => event.description,
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"published" => (event.publish_at || event.inserted_at) |> date_to_string(),
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"updated" => event.updated_at |> date_to_string(),
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"mediaType" => "text/html",
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"startTime" => event.begins_on |> shift_tz(event.options.timezone) |> date_to_string(),
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"joinMode" => to_string(event.join_options),
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"externalParticipationUrl" => event.external_participation_url,
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"endTime" => event.ends_on |> shift_tz(event.options.timezone) |> date_to_string(),
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"tag" => event.tags |> build_tags(),
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"maximumAttendeeCapacity" => event.options.maximum_attendee_capacity,
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"remainingAttendeeCapacity" =>
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remaining_attendee_capacity(event.options, participant_count),
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"participantCount" => participant_count,
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"repliesModerationOption" => event.options.comment_moderation,
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"commentsEnabled" => event.options.comment_moderation == :allow_all,
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"anonymousParticipationEnabled" => event.options.anonymous_participation,
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"attachment" => Enum.map(event.metadata, &EventMetadataConverter.metadata_to_as/1),
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"draft" => event.draft,
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# Remove me in MBZ 5.x
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"ical:status" => event.status |> to_string |> String.upcase(),
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"status" => event.status |> to_string |> String.upcase(),
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"id" => event.url,
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"url" => event.url,
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"inLanguage" => event.language,
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"timezone" => event.options.timezone,
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"contacts" => Enum.map(event.contacts, & &1.url),
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"isOnline" => event.options.is_online
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}
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|> maybe_add_physical_address(event)
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|> maybe_add_event_picture(event)
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|> maybe_add_online_address(event)
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|> maybe_add_inline_media(event)
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end
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@spec attributed_to_or_default(EventModel.t()) :: Actor.t()
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defp attributed_to_or_default(%EventModel{} = event) do
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if(is_nil(event.attributed_to) or not Ecto.assoc_loaded?(event.attributed_to),
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do: nil,
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else: event.attributed_to
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) ||
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event.organizer_actor
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end
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# Get only elements that we have in EventOptions
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@spec get_options(map, Address.t() | nil) :: map
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defp get_options(object, address) do
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%{
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maximum_attendee_capacity: object["maximumAttendeeCapacity"],
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anonymous_participation: object["anonymousParticipationEnabled"],
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comment_moderation:
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Map.get(
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object,
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"repliesModerationOption",
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if(Map.get(object, "commentsEnabled", true), do: :allow_all, else: :closed)
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),
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timezone: calculate_timezone(object, address),
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is_online: object["isOnline"] == true
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}
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end
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defp calculate_timezone(%{"timezone" => timezone}, %Address{geom: geom}) do
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TimezoneDetector.detect(
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timezone,
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geom,
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"Etc/UTC"
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)
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end
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defp calculate_timezone(_object, nil), do: nil
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defp calculate_timezone(_object, %Address{geom: nil}), do: nil
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defp calculate_timezone(_object, %Address{geom: geom}) do
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TimezoneDetector.detect(
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nil,
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geom,
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"Etc/UTC"
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)
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end
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defp get_metdata(%{"attachment" => attachments}) do
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attachments
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|> Enum.filter(&(&1["type"] == "PropertyValue"))
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|> Enum.map(&EventMetadataConverter.as_to_metadata/1)
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end
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defp get_metdata(_), do: []
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defp get_visibility(object), do: if(@ap_public in object["to"], do: :public, else: :unlisted)
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@spec date_to_string(DateTime.t() | nil) :: String.t()
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defp date_to_string(nil), do: nil
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defp date_to_string(%DateTime{} = date), do: DateTime.to_iso8601(date)
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@spec shift_tz(DateTime.t(), String.t() | nil) :: DateTime.t()
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defp shift_tz(%DateTime{} = date, timezone) when is_binary(timezone) do
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DateTime.shift_zone!(date, timezone)
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end
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defp shift_tz(datetime, _tz), do: datetime
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defp get_online_address(attachments) do
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Enum.find_value(attachments, fn attachment ->
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case attachment do
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%{
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"type" => "Link",
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"href" => url,
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"mediaType" => "text/html",
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"name" => @online_address_name
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} ->
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url
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_ ->
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nil
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end
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end)
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end
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@spec maybe_add_physical_address(map(), EventModel.t()) :: map()
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defp maybe_add_physical_address(res, %EventModel{
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physical_address: %Address{} = physical_address
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}) do
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Map.put(res, "location", AddressConverter.model_to_as(physical_address))
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end
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defp maybe_add_physical_address(res, %EventModel{physical_address: _}), do: res
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@spec maybe_add_event_picture(map(), EventModel.t()) :: map()
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defp maybe_add_event_picture(res, %EventModel{picture: %Media{} = picture}) do
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Map.update(
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res,
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"attachment",
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[],
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&(&1 ++
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[
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picture
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|> MediaConverter.model_to_as()
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|> Map.put("name", @banner_picture_name)
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])
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)
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end
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defp maybe_add_event_picture(res, %EventModel{picture: _}), do: res
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@spec maybe_add_online_address(map(), EventModel.t()) :: map()
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defp maybe_add_online_address(res, %EventModel{online_address: online_address})
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when is_binary(online_address) do
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Map.update(
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res,
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"attachment",
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[],
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&(&1 ++
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[
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%{
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"type" => "Link",
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"href" => online_address,
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"mediaType" => "text/html",
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"name" => @online_address_name
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}
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])
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)
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end
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defp maybe_add_online_address(res, %EventModel{online_address: _}), do: res
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@spec maybe_add_inline_media(map(), EventModel.t()) :: map()
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defp maybe_add_inline_media(res, %EventModel{media: media}) do
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medias = Enum.map(media, &MediaConverter.model_to_as/1)
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Map.update(
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res,
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"attachment",
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[],
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&(&1 ++ medias)
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)
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end
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@spec is_local?(String.t()) :: boolean()
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defp is_local?(url) do
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%URI{host: url_domain} = URI.parse(url)
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%URI{host: local_domain} = URI.parse(Endpoint.url())
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url_domain == local_domain
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end
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@spec get_contacts(map()) :: list(Actor.t())
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defp get_contacts(object) do
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object
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|> Map.get("contacts", [])
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|> Enum.map(&get_contact/1)
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|> Enum.filter(&match?({:ok, _}, &1))
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|> Enum.map(fn {:ok, contact} -> contact end)
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end
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defp get_contact(contact) do
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contact
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|> get_url()
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|> fetch_actor()
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end
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@spec remaining_attendee_capacity(map(), integer()) :: integer() | nil
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defp remaining_attendee_capacity(
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%{maximum_attendee_capacity: maximum_attendee_capacity},
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participant_count
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)
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when is_integer(maximum_attendee_capacity) and maximum_attendee_capacity > 0 do
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maximum_attendee_capacity - participant_count
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end
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defp remaining_attendee_capacity(
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%{maximum_attendee_capacity: _},
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_participant_count
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),
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do: nil
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end
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