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.Actor
alias Mobilizon.Events
alias Mobilizon.Events.Tag
alias Mobilizon.Mention
alias Mobilizon.Storage.Repo
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alias Mobilizon.Federation.ActivityPub
alias Mobilizon.Web.Endpoint
require Logger
@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_address(%{id: id}) do
with {id, ""} <- Integer.parse(id), do: %{id: id}
end
def fetch_address(address) when is_map(address) do
address
end
@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_bitstring(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
@spec create_mention(map(), list()) :: list()
defp create_mention(mention, acc) when is_map(mention) do
with true <- mention["type"] == "Mention",
{:ok, %Actor{id: actor_id}} <- ActivityPub.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()) :: {Actor.t() | nil, Actor.t() | nil}
def maybe_fetch_actor_and_attributed_to_id(%{
"actor" => actor_url,
"attributedTo" => attributed_to_url
})
when is_nil(attributed_to_url) do
{fetch_actor(actor_url), nil}
end
@spec maybe_fetch_actor_and_attributed_to_id(map()) :: {Actor.t() | nil, Actor.t() | nil}
def maybe_fetch_actor_and_attributed_to_id(%{
"actor" => actor_url,
"attributedTo" => attributed_to_url
})
when is_nil(actor_url) do
{fetch_actor(attributed_to_url), nil}
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 actor <- fetch_actor(actor_url),
attributed_to <- fetch_actor(attributed_to_url) do
{actor, attributed_to}
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
{fetch_actor(attributed_to_url), nil}
end
def maybe_fetch_actor_and_attributed_to_id(_), do: {nil, nil}
@spec fetch_actor(String.t()) :: Actor.t()
defp fetch_actor(actor_url) do
with {:ok, %Actor{suspended: false} = actor} <-
ActivityPub.get_or_fetch_actor_by_url(actor_url) do
actor
end
end
end