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Code Issues Pull Requests Releases Activity
54c5c15ef2
mobilizon.chapril.org-mobil.../lib/service/activity_pub/activity_pub.ex
miffigriffi 0a0d07cf38
Fix software design suggestions
2019-09-26 17:45:47 +02:00

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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/activity_pub.ex
defmodule Mobilizon.Service.ActivityPub do
@moduledoc """
# ActivityPub context.
"""
import Mobilizon.Service.ActivityPub.{Utils, Visibility}
alias Mobilizon.{Actors, Config, Events}
alias Mobilizon.Actors.{Actor, Follower}
alias Mobilizon.Events.{Comment, Event, Participant}
alias Mobilizon.Service.ActivityPub.{Activity, Converter, Convertible, Relay, Transmogrifier}
alias Mobilizon.Service.{Federator, WebFinger}
alias Mobilizon.Service.HTTPSignatures.Signature
require Logger
@doc """
Get recipients for an activity or object
"""
@spec get_recipients(map()) :: list()
def get_recipients(data) do
(data["to"] || []) ++ (data["cc"] || [])
end
@doc """
Wraps an object into an activity
"""
@spec create_activity(map(), boolean()) :: {:ok, %Activity{}}
def create_activity(map, local \\ true) when is_map(map) do
with map <- lazy_put_activity_defaults(map) do
{:ok,
%Activity{
data: map,
local: local,
actor: map["actor"],
recipients: get_recipients(map)
}}
end
end
@doc """
Fetch an object from an URL, from our local database of events and comments, then eventually remote
"""
# TODO: Make database calls parallel
@spec fetch_object_from_url(String.t()) :: {:ok, %Event{}} | {:ok, %Comment{}} | {:error, any()}
def fetch_object_from_url(url) do
Logger.info("Fetching object from url #{url}")
with {:not_http, true} <- {:not_http, String.starts_with?(url, "http")},
{:existing_event, nil} <- {:existing_event, Events.get_event_by_url(url)},
{:existing_comment, nil} <- {:existing_comment, Events.get_comment_from_url(url)},
{:existing_actor, {:error, :actor_not_found}} <-
{:existing_actor, Actors.get_actor_by_url(url)},
{:ok, %{body: body, status_code: code}} when code in 200..299 <-
HTTPoison.get(
url,
[Accept: "application/activity+json"],
follow_redirect: true,
timeout: 10_000,
recv_timeout: 20_000
),
{:ok, data} <- Jason.decode(body),
params <- %{
"type" => "Create",
"to" => data["to"],
"cc" => data["cc"],
"actor" => data["attributedTo"],
"object" => data
},
{:ok, _activity, %{url: object_url} = _object} <- Transmogrifier.handle_incoming(params) do
case data["type"] do
"Event" ->
{:ok, Events.get_public_event_by_url_with_preload!(object_url)}
"Note" ->
{:ok, Events.get_comment_from_url_with_preload!(object_url)}
"Actor" ->
{:ok, Actors.get_actor_by_url!(object_url, true)}
other ->
{:error, other}
end
else
{:existing_event, %Event{url: event_url}} ->
{:ok, Events.get_public_event_by_url_with_preload!(event_url)}
{:existing_comment, %Comment{url: comment_url}} ->
{:ok, Events.get_comment_from_url_with_preload!(comment_url)}
{:existing_actor, {:ok, %Actor{url: actor_url}}} ->
{:ok, Actors.get_actor_by_url!(actor_url, true)}
e ->
require Logger
Logger.error(inspect(e))
{:error, e}
end
end
@doc """
Getting an actor from url, eventually creating it
"""
@spec get_or_fetch_by_url(String.t(), boolean) :: {:ok, Actor.t()} | {:error, String.t()}
def get_or_fetch_by_url(url, preload \\ false) do
case Actors.get_actor_by_url(url, preload) do
{:ok, %Actor{} = actor} ->
{:ok, actor}
_ ->
case make_actor_from_url(url, preload) do
{:ok, %Actor{} = actor} ->
{:ok, actor}
_ ->
Logger.warn("Could not fetch by AP id")
{:error, "Could not fetch by AP id"}
end
end
end
@doc """
Create an activity of type "Create"
"""
def create(%{to: to, actor: actor, object: object} = params) do
Logger.debug("creating an activity")
Logger.debug(inspect(params))
Logger.debug(inspect(object))
additional = params[:additional] || %{}
# only accept false as false value
local = !(params[:local] == false)
published = params[:published]
with create_data <-
make_create_data(
%{to: to, actor: actor, published: published, object: object},
additional
),
{:ok, activity} <- create_activity(create_data, local),
{:ok, object} <- insert_full_object(create_data),
:ok <- maybe_federate(activity) do
# {:ok, actor} <- Actors.increase_event_count(actor) do
{:ok, activity, object}
else
err ->
Logger.error("Something went wrong while creating an activity")
Logger.debug(inspect(err))
err
end
end
def accept(%{to: to, actor: actor, object: object} = params, activity_wrapper_id \\ nil) do
# only accept false as false value
local = !(params[:local] == false)
with data <- %{
"to" => to,
"type" => "Accept",
"actor" => actor,
"object" => object,
"id" => activity_wrapper_id || get_url(object) <> "/activity"
},
{:ok, activity} <- create_activity(data, local),
{:ok, object} <- insert_full_object(data),
:ok <- maybe_federate(activity) do
{:ok, activity, object}
end
end
def reject(%{to: to, actor: actor, object: object} = params, activity_wrapper_id \\ nil) do
# only accept false as false value
local = !(params[:local] == false)
with data <- %{
"to" => to,
"type" => "Reject",
"actor" => actor,
"object" => object,
"id" => activity_wrapper_id || get_url(object) <> "/activity"
},
{:ok, activity} <- create_activity(data, local),
{:ok, object} <- insert_full_object(data),
:ok <- maybe_federate(activity) do
{:ok, activity, object}
end
end
def update(%{to: to, cc: cc, actor: actor, object: object} = params) do
# only accept false as false value
local = !(params[:local] == false)
with data <- %{
"to" => to,
"cc" => cc,
"id" => object["url"],
"type" => "Update",
"actor" => actor,
"object" => object
},
{:ok, activity} <- create_activity(data, local),
{:ok, object} <- update_object(object["id"], data),
:ok <- maybe_federate(activity) do
{:ok, activity, object}
end
end
# TODO: This is weird, maybe we shouldn't check here if we can make the activity.
# def like(
# %Actor{url: url} = actor,
# object,
# activity_id \\ nil,
# local \\ true
# ) do
# with nil <- get_existing_like(url, object),
# like_data <- make_like_data(user, object, activity_id),
# {:ok, activity} <- create_activity(like_data, local),
# {:ok, object} <- insert_full_object(data),
# {:ok, object} <- add_like_to_object(activity, object),
# :ok <- maybe_federate(activity) do
# {:ok, activity, object}
# else
# %Activity{} = activity -> {:ok, activity, object}
# error -> {:error, error}
# end
# end
# def unlike(
# %User{} = actor,
# %Object{} = object,
# activity_id \\ nil,
# local \\ true
# ) do
# with %Activity{} = like_activity <- get_existing_like(actor.ap_id, object),
# unlike_data <- make_unlike_data(actor, like_activity, activity_id),
# {:ok, unlike_activity} <- create_activity(unlike_data, local),
# {:ok, _object} <- insert_full_object(data),
# {:ok, _activity} <- Repo.delete(like_activity),
# {:ok, object} <- remove_like_from_object(like_activity, object),
# :ok <- maybe_federate(unlike_activity) do
# {:ok, unlike_activity, like_activity, object}
# else
# _e -> {:ok, object}
# end
# end
def announce(
%Actor{} = actor,
object,
activity_id \\ nil,
local \\ true,
public \\ true
) do
with true <- is_public?(object),
announce_data <- make_announce_data(actor, object, activity_id, public),
{:ok, activity} <- create_activity(announce_data, local),
{:ok, object} <- insert_full_object(announce_data),
:ok <- maybe_federate(activity) do
{:ok, activity, object}
else
error ->
{:error, error}
end
end
def unannounce(
%Actor{} = actor,
object,
activity_id \\ nil,
cancelled_activity_id \\ nil,
local \\ true
) do
with announce_activity <- make_announce_data(actor, object, cancelled_activity_id),
unannounce_data <- make_unannounce_data(actor, announce_activity, activity_id),
{:ok, unannounce_activity} <- create_activity(unannounce_data, local),
{:ok, object} <- insert_full_object(unannounce_data),
:ok <- maybe_federate(unannounce_activity) do
{:ok, unannounce_activity, object}
else
_e -> {:ok, object}
end
end
@doc """
Make an actor follow another
"""
def follow(%Actor{} = follower, %Actor{} = followed, activity_id \\ nil, local \\ true) do
with {:ok, %Follower{url: follow_url}} <-
Actors.follow(followed, follower, activity_id, false),
activity_follow_id <-
activity_id || follow_url,
data <- make_follow_data(followed, follower, activity_follow_id),
{:ok, activity} <- create_activity(data, local),
{:ok, object} <- insert_full_object(data),
:ok <- maybe_federate(activity) do
{:ok, activity, object}
else
{:error, err, msg} when err in [:already_following, :suspended] ->
{:error, msg}
end
end
@doc """
Make an actor unfollow another
"""
@spec unfollow(Actor.t(), Actor.t(), String.t(), boolean()) :: {:ok, map()} | any()
def unfollow(%Actor{} = follower, %Actor{} = followed, activity_id \\ nil, local \\ true) do
with {:ok, %Follower{id: follow_id}} <- Actors.unfollow(followed, follower),
# We recreate the follow activity
data <-
make_follow_data(
followed,
follower,
"#{MobilizonWeb.Endpoint.url()}/follow/#{follow_id}/activity"
),
{:ok, follow_activity} <- create_activity(data, local),
{:ok, _object} <- insert_full_object(data),
activity_unfollow_id <-
activity_id || "#{MobilizonWeb.Endpoint.url()}/unfollow/#{follow_id}/activity",
unfollow_data <-
make_unfollow_data(follower, followed, follow_activity, activity_unfollow_id),
{:ok, activity} <- create_activity(unfollow_data, local),
{:ok, object} <- insert_full_object(unfollow_data),
:ok <- maybe_federate(activity) do
{:ok, activity, object}
else
err ->
Logger.debug("Error while unfollowing an actor #{inspect(err)}")
err
end
end
def delete(object, local \\ true)
def delete(%Event{url: url, organizer_actor: actor} = event, local) do
data = %{
"type" => "Delete",
"actor" => actor.url,
"object" => url,
"to" => [actor.url <> "/followers", "https://www.w3.org/ns/activitystreams#Public"],
"id" => url <> "/delete"
}
with {:ok, _} <- Events.delete_event(event),
{:ok, activity} <- create_activity(data, local),
:ok <- maybe_federate(activity) do
{:ok, activity, event}
end
end
def delete(%Comment{url: url, actor: actor} = comment, local) do
data = %{
"type" => "Delete",
"actor" => actor.url,
"object" => url,
"id" => url <> "/delete",
"to" => [actor.url <> "/followers", "https://www.w3.org/ns/activitystreams#Public"]
}
with {:ok, _} <- Events.delete_comment(comment),
{:ok, activity} <- create_activity(data, local),
{:ok, object} <- insert_full_object(data),
:ok <- maybe_federate(activity) do
{:ok, activity, object}
end
end
def delete(%Actor{url: url} = actor, local) do
data = %{
"type" => "Delete",
"actor" => url,
"object" => url,
"id" => url <> "/delete",
"to" => [url <> "/followers", "https://www.w3.org/ns/activitystreams#Public"]
}
with {:ok, _} <- Actors.delete_actor(actor),
{:ok, activity} <- create_activity(data, local),
{:ok, object} <- insert_full_object(data),
:ok <- maybe_federate(activity) do
{:ok, activity, object}
end
end
def flag(params) do
# only accept false as false value
local = !(params[:local] == false)
forward = !(params[:forward] == false)
additional = params[:additional] || %{}
additional =
if forward do
Map.merge(additional, %{"to" => [], "cc" => [params.reported_actor_url]})
else
Map.merge(additional, %{"to" => [], "cc" => []})
end
with flag_data <- make_flag_data(params, additional),
{:ok, activity} <- create_activity(flag_data, local),
{:ok, object} <- insert_full_object(flag_data),
:ok <- maybe_federate(activity) do
{:ok, activity, object}
end
end
def join(object, actor, local \\ true)
def join(%Event{} = event, %Actor{} = actor, local) do
with role <- Mobilizon.Events.get_default_participant_role(event),
{:ok, %Participant{} = participant} <-
Mobilizon.Events.create_participant(%{
role: role,
event_id: event.id,
actor_id: actor.id
}),
join_data <- Convertible.model_to_as(participant),
join_data <- Map.put(join_data, "to", [event.organizer_actor.url]),
join_data <- Map.put(join_data, "cc", []),
{:ok, activity} <- create_activity(join_data, local),
{:ok, _object} <- insert_full_object(join_data),
:ok <- maybe_federate(activity) do
if role === :participant do
accept(
%{to: [actor.url], actor: event.organizer_actor.url, object: join_data["id"]},
"#{MobilizonWeb.Endpoint.url()}/accept/join/#{participant.id}"
)
end
{:ok, activity, participant}
end
end
# TODO: Implement me
def join(%Actor{type: :Group} = _group, %Actor{} = _actor, _local) do
:error
end
def leave(object, actor, local \\ true)
# TODO: If we want to use this for exclusion we need to have an extra field
# for the actor that excluded the participant
def leave(
%Event{id: event_id, url: event_url} = event,
%Actor{id: actor_id, url: actor_url} = _actor,
local
) do
with {:only_organizer, false} <-
{:only_organizer, Participant.is_not_only_organizer(event_id, actor_id)},
{:ok, %Participant{} = participant} <-
Mobilizon.Events.get_participant(event_id, actor_id),
{:ok, %Participant{} = participant} <- Mobilizon.Events.delete_participant(participant),
leave_data <- %{
"type" => "Leave",
# If it's an exclusion it should be something else
"actor" => actor_url,
"object" => event_url,
"to" => [event.organizer_actor.url],
"cc" => []
},
{:ok, activity} <- create_activity(leave_data, local),
{:ok, _object} <- insert_full_object(leave_data),
:ok <- maybe_federate(activity) do
{:ok, activity, participant}
end
end
@doc """
Create an actor locally by it's URL (AP ID)
"""
@spec make_actor_from_url(String.t(), boolean()) :: {:ok, %Actor{}} | {:error, any()}
def make_actor_from_url(url, preload \\ false) do
case fetch_and_prepare_actor_from_url(url) do
{:ok, data} ->
Actors.upsert_actor(data, preload)
# Request returned 410
{:error, :actor_deleted} ->
Logger.info("Actor was deleted")
{:error, :actor_deleted}
e ->
Logger.warn("Failed to make actor from url")
{:error, e}
end
end
@doc """
Find an actor in our local database or call WebFinger to find what's its AP ID is and then fetch it
"""
@spec find_or_make_actor_from_nickname(String.t(), atom() | nil) :: tuple()
def find_or_make_actor_from_nickname(nickname, type \\ nil) do
case Actors.get_actor_by_name(nickname, type) do
%Actor{} = actor ->
{:ok, actor}
nil ->
make_actor_from_nickname(nickname)
end
end
@spec find_or_make_person_from_nickname(String.t()) :: tuple()
def find_or_make_person_from_nickname(nick), do: find_or_make_actor_from_nickname(nick, :Person)
@spec find_or_make_group_from_nickname(String.t()) :: tuple()
def find_or_make_group_from_nickname(nick), do: find_or_make_actor_from_nickname(nick, :Group)
@doc """
Create an actor inside our database from username, using WebFinger to find out it's AP ID and then fetch it
"""
@spec make_actor_from_nickname(String.t()) :: {:ok, %Actor{}} | {:error, any()}
def make_actor_from_nickname(nickname) do
case WebFinger.finger(nickname) do
{:ok, %{"url" => url}} when not is_nil(url) ->
make_actor_from_url(url)
_e ->
{:error, "No ActivityPub URL found in WebFinger"}
end
end
@doc """
Publish an activity to all appropriated audiences inboxes
"""
def publish(actor, activity) do
Logger.debug("Publishing an activity")
Logger.debug(inspect(activity))
public = is_public?(activity)
if public && !is_delete_activity?(activity) && Config.get([:instance, :allow_relay]) do
Logger.info(fn -> "Relaying #{activity.data["id"]} out" end)
Relay.publish(activity)
end
followers =
if actor.followers_url in activity.recipients do
Actors.list_external_followers_for_actor(actor)
else
[]
end
remote_inboxes =
(remote_actors(activity) ++ followers)
|> Enum.map(fn follower -> follower.shared_inbox_url end)
|> Enum.uniq()
{:ok, data} = Transmogrifier.prepare_outgoing(activity.data)
json = Jason.encode!(data)
Logger.debug(fn -> "Remote inboxes are : #{inspect(remote_inboxes)}" end)
Enum.each(remote_inboxes, fn inbox ->
Federator.enqueue(:publish_single_ap, %{
inbox: inbox,
json: json,
actor: actor,
id: activity.data["id"]
})
end)
end
defp is_delete_activity?(%Activity{data: %{"type" => "Delete"}}), do: true
defp is_delete_activity?(_), do: false
@doc """
Publish an activity to a specific inbox
"""
def publish_one(%{inbox: inbox, json: json, actor: actor, id: id}) do
Logger.info("Federating #{id} to #{inbox}")
%URI{host: host, path: _path} = URI.parse(inbox)
digest = Signature.build_digest(json)
date = Signature.generate_date_header()
# request_target = Signature.generate_request_target("POST", path)
signature =
Signature.sign(actor, %{
host: host,
"content-length": byte_size(json),
# TODO : Look me up in depth why Pleroma handles this inside lib/mobilizon_web/http_signature.ex
# "(request-target)": request_target,
digest: digest,
date: date
})
HTTPoison.post(
inbox,
json,
[
{"Content-Type", "application/activity+json"},
{"signature", signature},
{"digest", digest},
{"date", date}
],
hackney: [pool: :default]
)
end
# Fetching a remote actor's information through it's AP ID
@spec fetch_and_prepare_actor_from_url(String.t()) :: {:ok, struct()} | {:error, atom()} | any()
defp fetch_and_prepare_actor_from_url(url) do
Logger.debug("Fetching and preparing actor from url")
Logger.debug(inspect(url))
res =
with %HTTPoison.Response{status_code: 200, body: body} <-
HTTPoison.get!(url, [Accept: "application/activity+json"], follow_redirect: true),
:ok <- Logger.debug("response okay, now decoding json"),
{:ok, data} <- Jason.decode(body) do
Logger.debug("Got activity+json response at actor's endpoint, now converting data")
actor_data_from_actor_object(data)
else
# Actor is gone, probably deleted
{:ok, %HTTPoison.Response{status_code: 410}} ->
Logger.info("Response HTTP 410")
{:error, :actor_deleted}
e ->
Logger.warn("Could not decode actor at fetch #{url}, #{inspect(e)}")
{:error, e}
end
res
end
@doc """
Creating proper actor data struct from AP data
Convert ActivityPub data to our internal format
"""
@spec actor_data_from_actor_object(map()) :: {:ok, map()}
def actor_data_from_actor_object(data) when is_map(data) do
avatar =
data["icon"]["url"] &&
%{
"name" => data["icon"]["name"] || "avatar",
"url" => data["icon"]["url"]
}
banner =
data["image"]["url"] &&
%{
"name" => data["image"]["name"] || "banner",
"url" => data["image"]["url"]
}
actor_data = %{
url: data["id"],
avatar: avatar,
banner: banner,
name: data["name"],
preferred_username: data["preferredUsername"],
summary: data["summary"],
keys: data["publicKey"]["publicKeyPem"],
inbox_url: data["inbox"],
outbox_url: data["outbox"],
following_url: data["following"],
followers_url: data["followers"],
shared_inbox_url: data["endpoints"]["sharedInbox"],
domain: URI.parse(data["id"]).host,
manually_approves_followers: data["manuallyApprovesFollowers"],
type: data["type"]
}
{:ok, actor_data}
end
@doc """
Return all public activities (events & comments) for an actor
"""
@spec fetch_public_activities_for_actor(Actor.t(), integer(), integer()) :: map()
def fetch_public_activities_for_actor(%Actor{} = actor, page \\ 1, limit \\ 10) do
{:ok, events, total_events} = Events.list_public_events_for_actor(actor, page, limit)
{:ok, comments, total_comments} = Events.list_public_comments_for_actor(actor, page, limit)
event_activities = Enum.map(events, &event_to_activity/1)
comment_activities = Enum.map(comments, &comment_to_activity/1)
activities = event_activities ++ comment_activities
%{elements: activities, total: total_events + total_comments}
end
# Create an activity from an event
@spec event_to_activity(%Event{}, boolean()) :: Activity.t()
defp event_to_activity(%Event{} = event, local \\ true) do
%Activity{
recipients: ["https://www.w3.org/ns/activitystreams#Public"],
actor: event.organizer_actor.url,
data: Converter.Event.model_to_as(event),
local: local
}
end
# Create an activity from a comment
@spec comment_to_activity(%Comment{}, boolean()) :: Activity.t()
defp comment_to_activity(%Comment{} = comment, local \\ true) do
%Activity{
recipients: ["https://www.w3.org/ns/activitystreams#Public"],
actor: comment.actor.url,
data: Converter.Comment.model_to_as(comment),
local: local
}
end
# # Whether the Public audience is in the activity's audience
# defp is_public?(activity) do
# "https://www.w3.org/ns/activitystreams#Public" in (activity.data["to"] ++
# (activity.data["cc"] || []))
# end
end
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