debianize-mobilizon/lib/service/activity_pub/utils.ex

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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
alias Mobilizon.Activity
alias MobilizonWeb
alias MobilizonWeb.Router.Helpers
alias MobilizonWeb.Endpoint
alias Ecto.{Changeset, UUID}
import Ecto.Query
def make_json_ld_header do
%{
"@context" => [
"https://www.w3.org/ns/activitystreams",
%{
"manuallyApprovesFollowers" => "as:manuallyApprovesFollowers",
"sensitive" => "as:sensitive",
"Hashtag" => "as:Hashtag",
"toot" => "http://joinmastodon.org/ns#",
"Emoji" => "toot:Emoji"
}
]
}
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_object_id do
# Helpers.o_status_url(Endpoint, :object, UUID.generate())
# end
def generate_id(type) do
"#{MobilizonWeb.Endpoint.url()}/#{type}/#{UUID.generate()}"
end
# def create_context(context) do
# context = context || generate_id("contexts")
# changeset = Object.context_mapping(context)
#
# case Repo.insert(changeset) do
# {:ok, object} ->
# object
#
# # This should be solved by an upsert, but it seems ecto
# # has problems accessing the constraint inside the jsonb.
# {:error, _} ->
# Events.get_cached_by_url(context)
# end
# end
@doc """
Enqueues an activity for federation if it's local
"""
def maybe_federate(%Activity{local: true} = activity) do
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
@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
# %{data: %{"id" => context}, id: context_id} = create_context(map["context"])
#
# map =
# map
# |> Map.put_new_lazy("id", &generate_activity_id/0)
# |> Map.put_new_lazy("published", &make_date/0)
# |> Map.put_new("context", context)
# |> Map.put_new("context_id", context_id)
if is_map(map["object"]) do
object = lazy_put_object_defaults(map["object"], map)
%{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, activity \\ %{}) do
map
# |> Map.put_new_lazy("id", &generate_object_id/0)
|> Map.put_new_lazy("published", &make_date/0)
|> Map.put_new("context", activity["context"])
|> Map.put_new("context_id", activity["context_id"])
end
@doc """
Inserts a full object if it is contained in an activity.
"""
def insert_full_object(%{"object" => %{"type" => type} = object_data})
when is_map(object_data) and type == "Event" 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})
when is_map(object_data) and type == "Note" do
2018-08-24 11:34:00 +02:00
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" => object_data["inReplyTo"]
}
require Logger
Logger.info("comment data ready to be inserted")
Logger.info(inspect(data))
with {:ok, comm} <- Events.create_comment(data) do
Logger.info("comment inserted")
Logger.info(inspect(comm))
:ok
end
end
end
def insert_full_object(_), do: :ok
# def update_object_in_activities(%{data: %{"id" => id}} = object) do
# # TODO
# # Update activities that already had this. Could be done in a seperate process.
# # Alternatively, just don't do this and fetch the current object each time. Most
# # could probably be taken from cache.
# relevant_activities = Activity.all_by_object_url(id)
#
# Enum.map(relevant_activities, fn activity ->
# new_activity_data = activity.data |> Map.put("object", object.data)
# changeset = Changeset.change(activity, data: new_activity_data)
# Repo.update(changeset)
# end)
# end
#### 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_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
data = %{
"type" => "Follow",
"actor" => follower_id,
"to" => [followed_id],
"cc" => ["https://www.w3.org/ns/activitystreams#Public"],
"object" => followed_id
}
if activity_id, do: Map.put(data, "id", activity_id), else: data
end
# def fetch_latest_follow(%Actor{url: follower_id}, %Actor{url: followed_id}) do
# query =
# from(
# activity in Activity,
# where:
# fragment(
# "? @> ?",
# activity.data,
# ^%{type: "Follow", actor: follower_id, object: followed_id}
# ),
# order_by: [desc: :id],
# limit: 1
# )
#
# Repo.one(query)
# 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,
"context" => params.context
}
|> 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