mobilizon/lib/service/activity_pub/utils.ex
Thomas Citharel 5aaf291bc9
Remove aliases that don't do anything
Thx @chocobozzz

Signed-off-by: Thomas Citharel <tcit@tcit.fr>
2018-11-29 17:46:28 +01:00

436 lines
11 KiB
Elixir

defmodule Mobilizon.Service.ActivityPub.Utils do
@moduledoc """
# Utils
Various utils
"""
alias Mobilizon.Repo
alias Mobilizon.Actors
alias Mobilizon.Actors.Actor
alias Mobilizon.Events.Event
alias Mobilizon.Events.Comment
alias Mobilizon.Events
alias Mobilizon.Activity
alias Mobilizon.Service.ActivityPub
alias Ecto.{Changeset, UUID}
require Logger
def make_context(%Activity{data: %{"context" => context}}), do: context
def make_context(_), do: generate_context_id()
def make_json_ld_header do
%{
"@context" => [
"https://www.w3.org/ns/activitystreams",
"https://litepub.github.io/litepub/context.jsonld",
%{
"sc" => "http://schema.org#",
"Hashtag" => "as:Hashtag",
"category" => "sc:category",
"uuid" => "sc:identifier"
}
]
}
end
def make_date do
DateTime.utc_now() |> DateTime.to_iso8601()
end
def generate_activity_id do
generate_id("activities")
end
def generate_context_id do
generate_id("contexts")
end
def generate_id(type) do
"#{MobilizonWeb.Endpoint.url()}/#{type}/#{UUID.generate()}"
end
@doc """
Enqueues an activity for federation if it's local
"""
def maybe_federate(%Activity{local: true} = activity) do
Logger.debug("Maybe federate an activity")
priority =
case activity.data["type"] do
"Delete" -> 10
"Create" -> 1
_ -> 5
end
Mobilizon.Service.Federator.enqueue(:publish, activity, priority)
:ok
end
def maybe_federate(_), do: :ok
def remote_actors(%{data: %{"to" => to} = data}) do
to = to ++ (data["cc"] || [])
to
|> Enum.map(fn url -> Actors.get_actor_by_url(url) end)
|> Enum.map(fn {status, actor} ->
case status do
:ok ->
actor
_ ->
nil
end
end)
|> Enum.map(& &1)
|> Enum.filter(fn actor -> actor && !is_nil(actor.domain) end)
end
@doc """
Adds an id and a published data if they aren't there,
also adds it to an included object
"""
def lazy_put_activity_defaults(map) do
if is_map(map["object"]) do
object = lazy_put_object_defaults(map["object"])
%{map | "object" => object}
else
map
end
end
@doc """
Adds an id and published date if they aren't there.
"""
def lazy_put_object_defaults(map) do
Map.put_new_lazy(map, "published", &make_date/0)
end
@doc """
Inserts a full object if it is contained in an activity.
"""
def insert_full_object(object_data, local \\ false)
@doc """
Inserts a full object if it is contained in an activity.
"""
def insert_full_object(%{"object" => %{"type" => type} = object_data}, local)
when is_map(object_data) and type == "Event" and not local do
with {:ok, _} <- Events.create_event(object_data) do
:ok
end
end
@doc """
Inserts a full object if it is contained in an activity.
"""
def insert_full_object(%{"object" => %{"type" => type} = object_data}, local)
when is_map(object_data) and type == "Note" and not local do
with {:ok, %Actor{id: actor_id}} <- Actors.get_or_fetch_by_url(object_data["actor"]) do
data = %{
"text" => object_data["content"],
"url" => object_data["id"],
"actor_id" => actor_id,
"in_reply_to_comment_id" => nil,
"event_id" => nil,
"uuid" => object_data["uuid"],
"local" => local
}
# We fetch the parent object
data =
if Map.has_key?(object_data, "inReplyTo") && object_data["inReplyTo"] != nil &&
object_data["inReplyTo"] != "" do
Logger.debug("Object has inReplyTo #{object_data["inReplyTo"]}")
case ActivityPub.fetch_object_from_url(object_data["inReplyTo"]) do
# Reply to an event (Comment)
{:ok, %Event{id: id}} ->
Logger.debug("Parent object is an event")
data |> Map.put("event_id", id)
# Reply to a comment (Comment)
{:ok, %Comment{id: id} = comment} ->
Logger.debug("Parent object is another comment")
data
|> Map.put("in_reply_to_comment_id", id)
|> Map.put("origin_comment_id", comment |> Comment.get_thread_id())
# Anthing else is kind of a MP
object ->
Logger.debug("Parent object is something we don't handle")
Logger.debug(inspect(object))
data
end
else
Logger.debug("No parent object for this comment")
data
end
with {:ok, _comment} <- Events.create_comment(data) do
:ok
else
err ->
Logger.error("Error while inserting a remote comment inside database")
Logger.error(inspect(err))
{:error, err}
end
end
end
def insert_full_object(_, _), do: :ok
#### Like-related helpers
# @doc """
# Returns an existing like if a user already liked an object
# """
# def get_existing_like(actor, %{data: %{"id" => id}}) do
# query =
# from(
# activity in Activity,
# where: fragment("(?)->>'actor' = ?", activity.data, ^actor),
# # this is to use the index
# where:
# fragment(
# "coalesce((?)->'object'->>'id', (?)->>'object') = ?",
# activity.data,
# activity.data,
# ^id
# ),
# where: fragment("(?)->>'type' = 'Like'", activity.data)
# )
#
# Repo.one(query)
# end
def make_event_data(
%Event{title: title, organizer_actor: actor, uuid: uuid},
to \\ ["https://www.w3.org/ns/activitystreams#Public"]
) do
%{
"type" => "Event",
"to" => to,
"title" => title,
"actor" => actor.url,
"uuid" => uuid,
"id" => "#{MobilizonWeb.Endpoint.url()}/events/#{uuid}"
}
end
@doc """
Make an AP comment object from an existing `Comment` structure.
"""
def make_comment_data(
%Comment{
text: text,
actor: actor,
uuid: uuid,
in_reply_to_comment: reply_to,
event: event
},
to \\ ["https://www.w3.org/ns/activitystreams#Public"]
) do
object = %{
"type" => "Note",
"to" => to,
"content" => text,
"actor" => actor.url,
"uuid" => uuid,
"id" => "#{MobilizonWeb.Endpoint.url()}/comments/#{uuid}"
}
if reply_to do
object |> Map.put("inReplyTo", reply_to.url || event.url)
else
object
end
end
def make_comment_data(
actor,
to,
content_html,
# attachments,
inReplyTo \\ nil,
# tags,
_cw \\ nil,
cc \\ []
) do
Logger.debug("Making comment data")
uuid = Ecto.UUID.generate()
object = %{
"type" => "Note",
"to" => to,
"cc" => cc,
"content" => content_html,
# "summary" => cw,
# "attachment" => attachments,
"actor" => actor,
"id" => "#{MobilizonWeb.Endpoint.url()}/comments/#{uuid}",
"uuid" => uuid
# "tag" => tags |> Enum.map(fn {_, tag} -> tag end) |> Enum.uniq()
}
if inReplyTo do
object
|> Map.put("inReplyTo", inReplyTo)
else
object
end
end
def make_like_data(%Actor{url: url} = actor, %{data: %{"id" => id}} = object, activity_id) do
data = %{
"type" => "Like",
"actor" => url,
"object" => id,
"to" => [actor.follower_address, object.data["actor"]],
"cc" => ["https://www.w3.org/ns/activitystreams#Public"],
"context" => object.data["context"]
}
if activity_id, do: Map.put(data, "id", activity_id), else: data
end
def update_element_in_object(property, element, object) do
with new_data <-
object.data
|> Map.put("#{property}_count", length(element))
|> Map.put("#{property}s", element),
changeset <- Changeset.change(object, data: new_data),
{:ok, object} <- Repo.update(changeset) do
{:ok, object}
end
end
# def update_likes_in_object(likes, object) do
# update_element_in_object("like", likes, object)
# end
#
# def add_like_to_object(%Activity{data: %{"actor" => actor}}, object) do
# with likes <- [actor | object.data["likes"] || []] |> Enum.uniq() do
# update_likes_in_object(likes, object)
# end
# end
#
# def remove_like_from_object(%Activity{data: %{"actor" => actor}}, object) do
# with likes <- (object.data["likes"] || []) |> List.delete(actor) do
# update_likes_in_object(likes, object)
# end
# end
#### Follow-related helpers
@doc """
Makes a follow activity data for the given follower and followed
"""
def make_follow_data(%Actor{url: follower_id}, %Actor{url: followed_id}, activity_id) do
Logger.debug("Make follow data")
data = %{
"type" => "Follow",
"actor" => follower_id,
"to" => [followed_id],
"cc" => ["https://www.w3.org/ns/activitystreams#Public"],
"object" => followed_id
}
Logger.debug(inspect(data))
if activity_id,
do: Map.put(data, "id", "#{MobilizonWeb.Endpoint.url()}/follow/#{activity_id}/activity"),
else: data
end
#### Announce-related helpers
@doc """
Make announce activity data for the given actor and object
"""
def make_announce_data(
%Actor{url: url} = user,
%Event{id: id} = object,
activity_id
) do
data = %{
"type" => "Announce",
"actor" => url,
"object" => id,
"to" => [user.follower_address, object.data["actor"]],
"cc" => ["https://www.w3.org/ns/activitystreams#Public"],
"context" => object.data["context"]
}
if activity_id, do: Map.put(data, "id", activity_id), else: data
end
def add_announce_to_object(%Activity{data: %{"actor" => actor}}, object) do
with announcements <- [actor | object.data["announcements"] || []] |> Enum.uniq() do
update_element_in_object("announcement", announcements, object)
end
end
#### Unfollow-related helpers
def make_unfollow_data(follower, followed, follow_activity) do
%{
"type" => "Undo",
"actor" => follower.url,
"to" => [followed.url],
"object" => follow_activity.data["id"]
}
end
#### Create-related helpers
def make_create_data(params, additional \\ %{}) do
published = params.published || make_date()
%{
"type" => "Create",
"to" => params.to |> Enum.uniq(),
"actor" => params.actor.url,
"object" => params.object,
"published" => published
}
|> Map.merge(additional)
end
@doc """
Converts PEM encoded keys to a public key representation
"""
def pem_to_public_key(pem) do
[key_code] = :public_key.pem_decode(pem)
key = :public_key.pem_entry_decode(key_code)
case key do
{:RSAPrivateKey, _, modulus, exponent, _, _, _, _, _, _, _} ->
{:RSAPublicKey, modulus, exponent}
{:RSAPublicKey, modulus, exponent} ->
{:RSAPublicKey, modulus, exponent}
end
end
@doc """
Converts PEM encoded keys to a private key representation
"""
def pem_to_private_key(pem) do
[private_key_code] = :public_key.pem_decode(pem)
:public_key.pem_entry_decode(private_key_code)
end
@doc """
Converts PEM encoded keys to a PEM public key representation
"""
def pem_to_public_key_pem(pem) do
public_key = pem_to_public_key(pem)
public_key = :public_key.pem_entry_encode(:RSAPublicKey, public_key)
:public_key.pem_encode([public_key])
end
end