mobilizon/lib/service/activity_pub/activity_pub.ex

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defmodule Mobilizon.Service.ActivityPub do
@moduledoc """
# ActivityPub
Every ActivityPub method
"""
alias Mobilizon.Events
alias Mobilizon.Events.{Event, Category, Comment}
alias Mobilizon.Service.ActivityPub.Transmogrifier
alias Mobilizon.Service.WebFinger
alias Mobilizon.Activity
alias Mobilizon.Actors
alias Mobilizon.Actors.Actor
alias Mobilizon.Service.Federator
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require Logger
import Mobilizon.Service.ActivityPub.Utils
@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
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TODO: Rename me
"""
@spec insert(map(), boolean()) :: {:ok, %Activity{}} | {:error, any()}
def insert(map, local \\ true) when is_map(map) do
with map <- lazy_put_activity_defaults(map),
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:ok <- insert_full_object(map, local) do
object_id =
cond do
is_map(map["object"]) ->
map["object"]["id"]
is_binary(map["object"]) ->
map["id"]
end
map = Map.put(map, "id", "#{object_id}/activity")
activity = %Activity{
data: map,
local: local,
actor: map["actor"],
recipients: get_recipients(map)
}
# Notification.create_notifications(activity)
# stream_out(activity)
{:ok, activity}
else
%Activity{} = activity -> {:ok, activity}
error -> {:error, error}
end
end
@doc """
Fetch an object from an URL, from our local database of events and comments, then eventually remote
"""
@spec fetch_object_from_url(String.t()) :: {:ok, %Event{}} | {:ok, %Comment{}} | {:error, any()}
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def fetch_object_from_url(url) do
with true <- String.starts_with?(url, "http"),
nil <- Events.get_event_by_url(url),
nil <- Events.get_comment_from_url(url),
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{: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} <- Transmogrifier.handle_incoming(params) do
case data["type"] do
"Event" ->
{:ok, Events.get_event_by_url!(activity.data["object"]["id"])}
"Note" ->
{:ok, Events.get_comment_from_url!(activity.data["object"]["id"])}
end
else
object = %Event{} -> {:ok, object}
object = %Comment{} -> {:ok, object}
e -> {:error, e}
end
end
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def create(%{to: to, actor: actor, object: object} = params) do
Logger.debug("creating an activity")
additional = params[:additional] || %{}
# only accept false as false value
local = !(params[:local] == false)
published = params[:published]
with create_data <-
make_create_data(
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%{to: to, actor: actor, published: published, object: object},
additional
),
{:ok, activity} <- insert(create_data, local),
:ok <- maybe_federate(activity) do
# {:ok, actor} <- Actors.increase_event_count(actor) do
{:ok, activity}
else
err ->
Logger.error("Something went wrong")
Logger.error(inspect(err))
end
end
def accept(%{to: to, actor: actor, object: object} = params) do
# only accept false as false value
local = !(params[:local] == false)
with data <- %{"to" => to, "type" => "Accept", "actor" => actor, "object" => object},
{:ok, activity} <- insert(data, local),
:ok <- maybe_federate(activity) do
{:ok, activity}
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,
"type" => "Update",
"actor" => actor,
"object" => object
},
{:ok, activity} <- insert(data, local),
:ok <- maybe_federate(activity) do
{:ok, activity}
end
end
def follow(%Actor{} = follower, %Actor{} = followed, _activity_id \\ nil, local \\ true) do
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with {:ok, follow} <- Actor.follow(follower, followed, true),
data <- make_follow_data(follower, followed, follow.id),
{:ok, activity} <- insert(data, local),
:ok <- maybe_federate(activity) do
{:ok, activity}
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else
{err, _} when err in [:already_following, :suspended] ->
{:error, err}
end
end
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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"]
}
with Events.delete_event(event),
{:ok, activity} <- insert(data, local),
:ok <- maybe_federate(activity) do
{:ok, activity}
end
end
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def delete(%Comment{url: url, actor: actor} = comment, local) do
data = %{
"type" => "Delete",
"actor" => actor.url,
"object" => url,
"to" => [actor.url <> "/followers", "https://www.w3.org/ns/activitystreams#Public"]
}
with Events.delete_comment(comment),
{:ok, activity} <- insert(data, local),
:ok <- maybe_federate(activity) do
{:ok, activity}
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()}
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def make_actor_from_url(url, preload \\ false) do
with {:ok, data} <- fetch_and_prepare_actor_from_url(url) do
Actors.insert_or_update_actor(data, preload)
else
# Request returned 410
{:error, :actor_deleted} ->
{:error, :actor_deleted}
e ->
Logger.error("Failed to make actor from url")
Logger.error(inspect(e))
{: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
with %Actor{} = actor <- Actors.get_actor_by_name(nickname, type) do
{:ok, actor}
else
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
with {:ok, %{"url" => url}} when not is_nil(url) <- WebFinger.finger(nickname) do
make_actor_from_url(url)
else
_e -> {:error, "No ActivityPub URL found in WebFinger"}
end
end
def publish(actor, activity) do
Logger.debug("Publishing an activity")
followers =
if actor.followers_url in activity.recipients do
{:ok, followers} = Actor.get_followers(actor)
followers |> Enum.filter(fn follower -> is_nil(follower.domain) end)
else
[]
end
remote_inboxes =
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(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)
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Logger.debug("Remote inboxes are : #{inspect(remote_inboxes)}")
Enum.each(remote_inboxes, fn inbox ->
Federator.enqueue(:publish_single_ap, %{
inbox: inbox,
json: json,
actor: actor,
id: activity.data["id"]
})
end)
end
def publish_one(%{inbox: inbox, json: json, actor: actor, id: id}) do
Logger.info("Federating #{id} to #{inbox}")
host = URI.parse(inbox).host
signature =
Mobilizon.Service.HTTPSignatures.sign(actor, %{
host: host,
"content-length": byte_size(json)
})
HTTPoison.post(
inbox,
json,
[{"Content-Type", "application/activity+json"}, {"signature", signature}],
hackney: [pool: :default]
)
end
# Fetching a remote actor's informations 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
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Logger.debug("Fetching and preparing actor from url")
with {:ok, %HTTPoison.Response{status_code: 200, body: body}} <-
HTTPoison.get(url, [Accept: "application/activity+json"], follow_redirect: true),
{:ok, data} <- Jason.decode(body) do
actor_data_from_actor_object(data)
else
# Actor is gone, probably deleted
{:ok, %HTTPoison.Response{status_code: 410}} ->
{:error, :actor_deleted}
e ->
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Logger.error("Could not decode actor at fetch #{url}, #{inspect(e)}")
e
end
end
@doc """
Creating proper actor data struct from AP data
"""
@spec actor_data_from_actor_object(map()) :: {:ok, map()}
def actor_data_from_actor_object(data) when is_map(data) do
actor_data = %{
url: data["id"],
info: %{
"ap_enabled" => true,
"source_data" => data
},
avatar_url: data["icon"]["url"],
banner_url: data["image"]["url"],
name: data["name"],
preferred_username: data["preferredUsername"],
follower_address: data["followers"],
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()) :: {list(), integer()}
def fetch_public_activities_for_actor(%Actor{} = actor, page \\ 1, limit \\ 10) do
case actor.type do
:Person ->
{:ok, events, total_events} = Events.get_events_for_actor(actor, page, limit)
{:ok, comments, total_comments} = Events.get_comments_for_actor(actor, page, limit)
event_activities = Enum.map(events, &event_to_activity/1)
comment_activities = Enum.map(comments, &comment_to_activity/1)
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activities = event_activities ++ comment_activities
{activities, total_events + total_comments}
:Service ->
bot = Actors.get_bot_by_actor(actor)
case bot.type do
"ics" ->
{:ok, %HTTPoison.Response{body: body} = _resp} = HTTPoison.get(bot.source)
ical_events =
body
|> ExIcal.parse()
|> ExIcal.by_range(DateTime.utc_now(), DateTime.utc_now() |> Timex.shift(years: 1))
activities =
ical_events
|> Enum.chunk_every(limit)
|> Enum.at(page - 1)
|> Enum.map(fn event ->
{:ok, activity} = ical_event_to_activity(event, actor, bot.source)
activity
end)
{activities, length(ical_events)}
end
end
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: event |> make_event_data,
local: local
}
end
# Create an activity from a comment
@spec comment_to_activity(%Comment{}, boolean()) :: Activity.t()
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defp comment_to_activity(%Comment{} = comment, local \\ true) do
%Activity{
recipients: ["https://www.w3.org/ns/activitystreams#Public"],
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actor: comment.actor.url,
data: comment |> make_comment_data,
local: local
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}
end
defp ical_event_to_activity(%ExIcal.Event{} = ical_event, %Actor{} = actor, _source) do
# Logger.debug(inspect ical_event)
# TODO : refactor me !
# TODO : also, there should be a form of cache that allows this to be more efficient
category =
if is_nil(ical_event.categories) do
nil
else
ical_category = ical_event.categories |> hd() |> String.downcase()
case ical_category |> Events.get_category_by_title() do
nil ->
case Events.create_category(%{"title" => ical_category}) do
{:ok, %Category{} = category} -> category
_ -> nil
end
category ->
category
end
end
{:ok, event} =
Events.create_event(%{
begins_on: ical_event.start,
ends_on: ical_event.end,
inserted_at: ical_event.stamp,
updated_at: ical_event.stamp,
description: ical_event.description |> sanitize_ical_event_strings,
title: ical_event.summary |> sanitize_ical_event_strings,
organizer_actor: actor,
category: category
})
event_to_activity(event, false)
end
defp sanitize_ical_event_strings(string) when is_binary(string) do
string
|> String.replace(~s"\r\n", "")
|> String.replace(~s"\\,", ",")
end
defp sanitize_ical_event_strings(nil) do
nil
end
end