mobilizon/lib/federation/activity_stream/converter/utils.ex

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defmodule Mobilizon.Federation.ActivityStream.Converter.Utils do
@moduledoc """
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Various utils for converters.
"""
alias Mobilizon.{Actors, Addresses, Events}
alias Mobilizon.Actors.Actor
alias Mobilizon.Addresses.Address
alias Mobilizon.Events.Tag
alias Mobilizon.Medias.Media
alias Mobilizon.Mention
alias Mobilizon.Storage.Repo
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alias Mobilizon.Federation.ActivityPub.Actor, as: ActivityPubActor
alias Mobilizon.Federation.ActivityStream.Converter.Address, as: AddressConverter
alias Mobilizon.Federation.ActivityStream.Converter.Media, as: MediaConverter
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alias Mobilizon.Web.Endpoint
require Logger
@banner_picture_name "Banner"
@spec fetch_tags([String.t()]) :: [Tag.t()]
def fetch_tags(tags) when is_list(tags) do
Logger.debug("fetching tags")
Logger.debug(inspect(tags))
tags |> Enum.flat_map(&fetch_tag/1) |> Enum.uniq() |> Enum.map(&existing_tag_or_data/1)
end
def fetch_tags(_), do: []
@spec fetch_mentions([map()]) :: [map()]
def fetch_mentions(mentions) when is_list(mentions) do
Logger.debug("fetching mentions")
Enum.reduce(mentions, [], fn mention, acc -> create_mention(mention, acc) end)
end
def fetch_mentions(_), do: []
def fetch_actors(actors) when is_list(actors) do
Logger.debug("fetching contacts")
actors |> Enum.map(& &1.id) |> Enum.filter(& &1) |> Enum.map(&Actors.get_actor/1)
end
def fetch_actors(_), do: []
@spec build_tags([Tag.t()]) :: [map()]
def build_tags(tags) do
Enum.map(tags, fn %Tag{} = tag ->
%{
"href" => Endpoint.url() <> "/tags/#{tag.slug}",
"name" => "##{tag.title}",
"type" => "Hashtag"
}
end)
end
def build_mentions(mentions) do
Enum.map(mentions, fn %Mention{} = mention ->
if Ecto.assoc_loaded?(mention.actor) do
build_mention(mention.actor)
else
build_mention(Repo.preload(mention, [:actor]).actor)
end
end)
end
defp build_mention(%Actor{} = actor) do
%{
"href" => actor.url,
"name" => "@#{Actor.preferred_username_and_domain(actor)}",
"type" => "Mention"
}
end
defp fetch_tag(%{title: title}), do: [title]
defp fetch_tag(tag) when is_map(tag) do
case tag["type"] do
"Hashtag" ->
[tag_without_hash(tag["name"])]
_err ->
[]
end
end
defp fetch_tag(tag) when is_binary(tag), do: [tag_without_hash(tag)]
defp tag_without_hash("#" <> tag_title), do: tag_title
defp tag_without_hash(tag_title), do: tag_title
defp existing_tag_or_data(tag_title) do
case Events.get_tag_by_title(tag_title) do
%Tag{} = tag -> %{title: tag.title, id: tag.id}
nil -> %{title: tag_title}
end
end
@spec create_mention(map(), list()) :: list()
defp create_mention(%Actor{id: actor_id} = _mention, acc) do
acc ++ [%{actor_id: actor_id}]
end
defp create_mention(mention, acc) when is_map(mention) do
with true <- mention["type"] == "Mention",
{:ok, %Actor{id: actor_id}} <-
ActivityPubActor.get_or_fetch_actor_by_url(mention["href"]) do
acc ++ [%{actor_id: actor_id}]
else
_err ->
acc
end
end
@spec create_mention({String.t(), map()}, list()) :: list()
defp create_mention({_, mention}, acc) when is_map(mention) do
create_mention(mention, acc)
end
@spec maybe_fetch_actor_and_attributed_to_id(map()) ::
{:ok, Actor.t(), Actor.t() | nil} | {:error, atom()}
def maybe_fetch_actor_and_attributed_to_id(%{
"actor" => actor_url,
"attributedTo" => attributed_to_url
})
when is_nil(attributed_to_url) do
case fetch_actor(actor_url) do
{:ok, %Actor{} = actor} ->
{:ok, actor, nil}
{:error, err} ->
{:error, err}
end
end
def maybe_fetch_actor_and_attributed_to_id(%{
"actor" => actor_url,
"attributedTo" => attributed_to_url
})
when is_nil(actor_url) do
case fetch_actor(attributed_to_url) do
{:ok, %Actor{} = actor} ->
{:ok, actor, nil}
{:error, err} ->
{:error, err}
end
end
# Only when both actor and attributedTo fields are both filled is when we can return both
def maybe_fetch_actor_and_attributed_to_id(%{
"actor" => actor_url,
"attributedTo" => attributed_to_url
})
when actor_url != attributed_to_url do
with {:ok, %Actor{} = actor} <- fetch_actor(actor_url),
{:ok, %Actor{} = attributed_to} <- fetch_actor(attributed_to_url) do
{:ok, actor, attributed_to}
else
{:error, err} ->
{:error, err}
end
end
# If we only have attributedTo and no actor, take attributedTo as the actor
def maybe_fetch_actor_and_attributed_to_id(%{
"attributedTo" => attributed_to_url
}) do
case fetch_actor(attributed_to_url) do
{:ok, %Actor{} = attributed_to} -> {:ok, attributed_to, nil}
{:error, err} -> {:error, err}
end
end
def maybe_fetch_actor_and_attributed_to_id(_), do: {:error, :no_actor_found}
@spec fetch_actor(String.t()) :: {:ok, Actor.t()} | {:error, atom()}
def fetch_actor(actor_url) do
case ActivityPubActor.get_or_fetch_actor_by_url(actor_url) do
{:ok, %Actor{suspended: false} = actor} ->
{:ok, actor}
{:ok, %Actor{suspended: true} = _actor} ->
{:error, :actor_suspended}
{:error, err} ->
{:error, err}
end
end
@spec process_pictures(map(), integer()) :: Keyword.t()
def process_pictures(object, actor_id) do
attachements = Map.get(object, "attachment", [])
{banner, media_attachements} = get_medias(attachements)
media_attachements_map =
media_attachements
|> Enum.map(fn media_attachement ->
{media_attachement["url"],
MediaConverter.find_or_create_media(media_attachement, actor_id)}
end)
|> Enum.reduce(%{}, fn {old_url, media}, acc ->
case media do
{:ok, %Media{} = media} ->
Map.put(acc, old_url, media)
_ ->
acc
end
end)
media_attachements_map_urls =
media_attachements_map
|> Enum.map(fn {old_url, new_media} -> {old_url, new_media.file.url} end)
|> Map.new()
picture_id =
case banner do
banner_map when is_map(banner_map) ->
case MediaConverter.find_or_create_media(banner_map, actor_id) do
{:error, _err} ->
nil
{:ok, %Media{id: picture_id}} ->
picture_id
end
_ ->
nil
end
description = replace_media_urls_in_body(object["content"], media_attachements_map_urls)
[description: description, picture_id: picture_id, medias: Map.values(media_attachements_map)]
end
defp replace_media_urls_in_body(body, media_urls),
do:
Enum.reduce(media_urls, body, fn media_url, body ->
replace_media_url_in_body(body, media_url)
end)
defp replace_media_url_in_body(body, {old_url, new_url}),
do: String.replace(body, old_url, new_url)
@spec get_medias(list(map())) :: {map(), list(map())}
defp get_medias(attachments) do
banner = get_banner_picture(attachments)
{banner, Enum.filter(attachments, &(&1["type"] == "Document" && &1["url"] != banner["url"]))}
end
@spec get_banner_picture(list(map())) :: map()
defp get_banner_picture(attachments) do
# Prefer media with
media_with_picture_name =
Enum.find(attachments, &(&1["type"] == "Document" && &1["name"] == @banner_picture_name))
case media_with_picture_name do
# If no banner found, use the first media
nil -> Enum.find(attachments, &(&1["type"] == "Document"))
media_with_picture_name -> media_with_picture_name
end
end
@spec get_address(map | binary | nil) :: Address.t() | nil
def get_address(address_url) when is_binary(address_url) do
get_address(%{"id" => address_url})
end
def get_address(%{"id" => url} = map) when is_map(map) and is_binary(url) do
Logger.debug("Address with an URL, let's check against our own database")
case Addresses.get_address_by_url(url) do
%Address{} = address ->
address
_ ->
Logger.debug("not in our database, let's try to create it")
# This is odd, why do addresses have url instead of just @id?
map = Map.put(map, "url", map["id"])
do_get_address(map)
end
end
def get_address(map) when is_map(map) do
do_get_address(map)
end
def get_address(nil), do: nil
@spec do_get_address(map) :: Address.t() | nil
defp do_get_address(map) do
map = AddressConverter.as_to_model_data(map)
case Addresses.create_address(map) do
{:ok, %Address{} = address} ->
address
_ ->
nil
end
end
end