mobilizon/lib/service/activity_pub/utils.ex

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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.Addresses.Address
alias Mobilizon.Actors
alias Mobilizon.Actors.Actor
alias Mobilizon.Events.Event
alias Mobilizon.Events.Comment
alias Mobilizon.Media.Picture
alias Mobilizon.Events
alias Mobilizon.Activity
alias Mobilizon.Reports
alias Mobilizon.Reports.Report
alias Mobilizon.Users
alias Mobilizon.Service.ActivityPub.Converters
alias Ecto.Changeset
require Logger
alias MobilizonWeb.Router.Helpers, as: Routes
alias MobilizonWeb.Endpoint
# 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(%{"id" => id}), do: id
def get_url(id) when is_bitstring(id), do: id
def get_url(_), do: nil
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def make_json_ld_header do
%{
"@context" => [
"https://www.w3.org/ns/activitystreams",
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"https://litepub.github.io/litepub/context.jsonld",
%{
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"sc" => "http://schema.org#",
"Hashtag" => "as:Hashtag",
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"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
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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
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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)
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|> 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)
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@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 {:ok, object_data} <-
Converters.Event.as_to_model_data(object_data),
{:ok, %Event{} = event} <- Events.create_event(object_data) do
{:ok, event}
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, %Actor{} = group} <- Actors.create_group(object_data) do
{:ok, group}
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
with data <- Converters.Comment.as_to_model_data(object_data),
{:ok, %Comment{} = comment} <- Events.create_comment(data) do
{:ok, comment}
else
err ->
Logger.error("Error while inserting a remote comment inside database")
Logger.debug(inspect(err))
{:error, err}
end
end
@doc """
Inserts a full object if it is contained in an activity.
"""
def insert_full_object(%{"type" => "Flag"} = object_data)
when is_map(object_data) do
with data <- Converters.Flag.as_to_model_data(object_data),
{:ok, %Report{} = report} <- Reports.create_report(data) do
Enum.each(Users.list_moderators(), fn moderator ->
moderator
|> Mobilizon.Email.Admin.report(moderator, report)
|> Mobilizon.Mailer.deliver_later()
end)
{:ok, report}
else
err ->
Logger.error("Error while inserting a remote comment inside database")
Logger.debug(inspect(err))
{:error, err}
end
end
def insert_full_object(_), do: {:ok, nil}
#### 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
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@doc """
Save picture data from %Plug.Upload{} and return AS Link data.
"""
def make_picture_data(%Plug.Upload{} = picture) do
case MobilizonWeb.Upload.store(picture) do
{:ok, picture} ->
picture
_ ->
nil
end
end
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@doc """
Convert a picture model into an AS Link representation
"""
# TODO: Move me to Mobilizon.Service.ActivityPub.Converters
def make_picture_data(%Picture{file: file} = _picture) do
%{
"type" => "Document",
"url" => [
%{
"type" => "Link",
"mediaType" => file.content_type,
"href" => file.url
}
],
"name" => file.name
}
end
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@doc """
Save picture data from raw data and return AS Link data.
"""
def make_picture_data(picture) when is_map(picture) do
with {:ok, %{"url" => [%{"href" => url, "mediaType" => content_type}], "size" => size}} <-
MobilizonWeb.Upload.store(picture.file),
{:ok, %Picture{file: _file} = pic} <-
Mobilizon.Media.create_picture(%{
"file" => %{
"url" => url,
"name" => picture.name,
"content_type" => content_type,
"size" => size
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},
"actor_id" => picture.actor_id
}) do
make_picture_data(pic)
end
end
def make_picture_data(nil), do: nil
@doc """
Make an AP event object from an set of values
"""
@spec make_event_data(
String.t(),
map(),
String.t(),
String.t(),
map(),
list(),
map()
) :: map()
def make_event_data(
actor,
%{to: to, cc: cc} = _audience,
title,
content_html,
picture \\ nil,
tags \\ [],
metadata \\ %{}
) do
Logger.debug("Making event data")
uuid = Ecto.UUID.generate()
res = %{
"type" => "Event",
"to" => to,
"cc" => cc || [],
"content" => content_html,
"name" => title,
"startTime" => metadata.begins_on,
"category" => metadata.category,
"actor" => actor,
"id" => Routes.page_url(Endpoint, :event, uuid),
"uuid" => uuid,
"tag" =>
tags |> Enum.uniq() |> Enum.map(fn tag -> %{"type" => "Hashtag", "name" => "##{tag}"} end)
}
res =
if is_nil(metadata.physical_address),
do: res,
else: Map.put(res, "location", make_address_data(metadata.physical_address))
if is_nil(picture), do: res, else: Map.put(res, "attachment", [make_picture_data(picture)])
end
def make_address_data(%Address{} = address) do
res = %{
"type" => "Place",
"name" => address.description,
"id" => address.url,
"address" => %{
"type" => "PostalAddress",
"streetAddress" => address.street,
"postalCode" => address.postal_code,
"addressLocality" => address.locality,
"addressRegion" => address.region,
"addressCountry" => address.country
}
}
if is_nil(address.geom) do
res
else
Map.put(res, "geo", %{
"type" => "GeoCoordinates",
"latitude" => address.geom.coordinates |> elem(0),
"longitude" => address.geom.coordinates |> elem(1)
})
end
end
def make_address_data(address) do
Address
|> struct(address)
|> make_address_data()
end
@doc """
Make an AP comment object from an set of values
"""
def make_comment_data(
actor,
to,
content_html,
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# attachments,
inReplyTo \\ nil,
tags \\ [],
# _cw \\ nil,
cc \\ []
) do
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Logger.debug("Making comment data")
uuid = Ecto.UUID.generate()
object = %{
"type" => "Note",
"to" => to,
"cc" => cc,
"content" => content_html,
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# "summary" => cw,
# "attachment" => attachments,
"actor" => actor,
"id" => Routes.page_url(Endpoint, :comment, uuid),
"uuid" => uuid,
"tag" => tags |> Enum.uniq()
}
if inReplyTo do
object
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|> 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" => Actor.build_url(preferred_username, :page),
"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
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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
}
data =
if activity_id,
do: Map.put(data, "id", activity_id),
else: data
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Logger.debug(inspect(data))
data
end
#### Announce-related helpers
require Logger
@doc """
Make announce activity data for the given actor and object
"""
def make_announce_data(actor, object, activity_id, public \\ true)
def make_announce_data(
%Actor{url: actor_url, followers_url: actor_followers_url} = _actor,
%{"id" => url, "type" => type} = _object,
activity_id,
public
)
when type in ["Group", "Person", "Application"] do
do_make_announce_data(actor_url, actor_followers_url, url, url, activity_id, public)
end
def make_announce_data(
%Actor{url: actor_url, followers_url: actor_followers_url} = _actor,
%{"id" => url, "type" => type, "actor" => object_actor_url} = _object,
activity_id,
public
)
when type in ["Note", "Event"] do
do_make_announce_data(
actor_url,
actor_followers_url,
object_actor_url,
url,
activity_id,
public
)
end
defp do_make_announce_data(
actor_url,
actor_followers_url,
object_actor_url,
object_url,
activity_id,
public \\ true
) do
{to, cc} =
if public do
{[actor_followers_url, object_actor_url],
["https://www.w3.org/ns/activitystreams#Public"]}
else
{[actor_followers_url], []}
end
data = %{
"type" => "Announce",
"actor" => actor_url,
"object" => object_url,
"to" => to,
"cc" => cc
}
if activity_id, do: Map.put(data, "id", activity_id), else: data
end
@doc """
Make unannounce activity data for the given actor and object
"""
def make_unannounce_data(
%Actor{url: url} = actor,
activity,
activity_id
) do
data = %{
"type" => "Undo",
"actor" => url,
"object" => activity,
"to" => [actor.followers_url, actor.url],
"cc" => ["https://www.w3.org/ns/activitystreams#Public"]
}
if activity_id, do: Map.put(data, "id", activity_id), else: data
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,
"id" => params.object["id"] <> "/activity"
}
|> Map.merge(additional)
end
#### Flag-related helpers
@spec make_flag_data(map(), map()) :: map()
def make_flag_data(params, additional) do
object = [params.reported_actor_url] ++ params.comments_url
object = if params[:event_url], do: object ++ [params.event_url], else: object
%{
"type" => "Flag",
"id" => "#{MobilizonWeb.Endpoint.url()}/report/#{Ecto.UUID.generate()}",
"actor" => params.reporter_url,
"content" => params.content,
"object" => object,
"state" => "open"
}
|> 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