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mobilizon.chapril.org-mobil.../lib/service/activity_pub/utils.ex
Thomas Citharel 7086fe8389
Make Categories a predefined list 
Signed-off-by: Thomas Citharel <tcit@tcit.fr>

Allow null values for categories for now

Signed-off-by: Thomas Citharel <tcit@tcit.fr>
2019-02-25 15:31:04 +01:00

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# Portions of this file are derived from Pleroma:
# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social>
# SPDX-License-Identifier: AGPL-3.0-only
# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/web/activity_pub/utils.ex
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
require Logger
# Some implementations send the actor URI as the actor field, others send the entire actor object,
# so figure out what the actor's URI is based on what we have.
def get_url(object) do
case object do
%{"id" => id} -> id
id -> id
end
end
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.truncate(:second) |> DateTime.to_iso8601()
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 """
Converts an AP object data to our internal data structure
"""
def object_to_event_data(object) do
{:ok, %Actor{id: actor_id}} = Actors.get_actor_by_url(object["actor"])
%{
"title" => object["name"],
"description" => object["content"],
"organizer_actor_id" => actor_id,
"begins_on" => object["begins_on"],
"category" => object["category"],
"url" => object["id"],
"uuid" => object["uuid"]
}
end
@doc """
Inserts a full object if it is contained in an activity.
"""
def insert_full_object(object_data)
@doc """
Inserts a full object if it is contained in an activity.
"""
def insert_full_object(%{"object" => %{"type" => "Event"} = object_data})
when is_map(object_data) do
with object_data <- object_to_event_data(object_data),
{:ok, _} <- Events.create_event(object_data) do
:ok
end
end
def insert_full_object(%{"object" => %{"type" => "Group"} = object_data})
when is_map(object_data) do
with object_data <-
Map.put(object_data, "preferred_username", object_data["preferredUsername"]),
{:ok, _} <- Actors.create_group(object_data) do
:ok
end
end
@doc """
Inserts a full object if it is contained in an activity.
"""
def insert_full_object(%{"object" => %{"type" => "Note"} = object_data})
when is_map(object_data) do
Logger.debug("Inserting full comment")
Logger.debug(inspect(object_data))
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"]
}
# We fetch the parent object
Logger.debug("We're fetching the parent object")
data =
if Map.has_key?(object_data, "inReplyTo") && object_data["inReplyTo"] != nil &&
object_data["inReplyTo"] != "" do
Logger.debug(fn -> "Object has inReplyTo #{object_data["inReplyTo"]}" end)
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())
# Anything else is kind of a MP
{:error, 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
@doc """
Make an AP event object from an set of values
"""
@spec make_event_data(
String.t(),
String.t(),
String.t(),
String.t(),
list(),
list(),
map(),
String.t()
) :: map()
def make_event_data(
actor,
to,
title,
content_html,
# attachments,
tags \\ [],
# _cw \\ nil,
cc \\ [],
metadata \\ %{},
category \\ ""
) do
Logger.debug("Making event data")
uuid = Ecto.UUID.generate()
%{
"type" => "Event",
"to" => to,
"cc" => cc,
"content" => content_html,
"name" => title,
# "summary" => cw,
# "attachment" => attachments,
"begins_on" => metadata.begins_on,
"category" => category,
"actor" => actor,
"id" => "#{MobilizonWeb.Endpoint.url()}/events/#{uuid}",
"uuid" => uuid,
"tag" => tags |> Enum.map(fn {_, tag} -> tag end) |> Enum.uniq()
}
end
@spec make_event_data(Event.t(), list(String.t())) :: map()
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,
"attributedTo" => 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
@doc """
Make an AP comment object from an set of values
"""
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_group_data(
actor,
to,
preferred_username,
content_html,
# attachments,
tags \\ [],
# _cw \\ nil,
cc \\ []
) do
uuid = Ecto.UUID.generate()
%{
"type" => "Group",
"to" => to,
"cc" => cc,
"summary" => content_html,
"attributedTo" => actor,
"preferredUsername" => preferred_username,
"id" => "#{MobilizonWeb.Endpoint.url()}/~#{preferred_username}",
"uuid" => uuid,
"tag" => tags |> Enum.map(fn {_, tag} -> tag end) |> Enum.uniq()
}
end
#### Like-related helpers
@doc """
Returns an existing like if a user already liked an object
"""
# @spec get_existing_like(Actor.t, map()) :: nil
# def get_existing_like(%Actor{url: url} = actor, %{data: %{"id" => id}}) do
# nil
# 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.followers_url, 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 followed and follower
"""
def make_follow_data(%Actor{url: followed_id}, %Actor{url: follower_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", activity_id),
else: data
end
#### Announce-related helpers
@doc """
Make announce activity data for the given actor and object
"""
def make_announce_data(
%Actor{url: actor_url} = actor,
%Event{url: event_url} = object,
activity_id
) do
data = %{
"type" => "Announce",
"actor" => actor_url,
"object" => event_url,
"to" => [actor.followers_url, object.actor.url],
"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
@doc """
Make announce activity data for the given actor and object
"""
def make_announce_data(
%Actor{url: actor_url} = actor,
%Comment{url: comment_url} = object,
activity_id
) do
data = %{
"type" => "Announce",
"actor" => actor_url,
"object" => comment_url,
"to" => [actor.followers_url, object.actor.url],
"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
@spec make_unfollow_data(Actor.t(), Actor.t(), map(), String.t()) :: map()
def make_unfollow_data(
%Actor{url: follower_url},
%Actor{url: followed_url},
follow_activity,
activity_id
) do
data = %{
"type" => "Undo",
"actor" => follower_url,
"to" => [followed_url],
"object" => follow_activity.data
}
if activity_id, do: Map.put(data, "id", activity_id), else: data
end
#### Create-related helpers
@doc """
Make create activity data
"""
@spec make_create_data(map(), map()) :: map()
def make_create_data(params, additional \\ %{}) do
Logger.debug("Making create data")
Logger.debug(inspect(params))
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
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