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Split Federation as separate context

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rustra
2020-01-22 02:14:42 +01:00
parent f70af917f9
commit cdb520a95b
83 changed files with 323 additions and 253 deletions
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19
lib/service/activity_pub/activity.ex
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defmodule Mobilizon.Service.ActivityPub.Activity do
@moduledoc """
Represents an activity.
"""
@type t :: %__MODULE__{
data: String.t(),
local: boolean,
actor: Actor.t(),
recipients: [String.t()]
}
defstruct [
:data,
:local,
:actor,
:recipients
]
end

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lib/service/activity_pub/activity_pub.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/activity_pub.ex
defmodule Mobilizon.Service.ActivityPub do
@moduledoc """
# ActivityPub context.
"""
import Mobilizon.Service.ActivityPub.Utils
import Mobilizon.Service.ActivityPub.Visibility
alias Mobilizon.{Actors, Config, Events, Reports, Users, Share}
alias Mobilizon.Actors.{Actor, Follower}
alias Mobilizon.Events.{Comment, Event, Participant}
alias Mobilizon.Reports.Report
alias Mobilizon.Tombstone
alias Mobilizon.Service.ActivityPub.{Activity, Converter, Convertible, Relay, Transmogrifier}
alias Mobilizon.Service.{Federator, WebFinger}
alias Mobilizon.Service.HTTPSignatures.Signature
alias MobilizonWeb.API.Utils, as: APIUtils
alias Mobilizon.Service.ActivityPub.Audience
alias Mobilizon.Service.ActivityPub.Converter.Utils, as: ConverterUtils
alias MobilizonWeb.Email.{Admin, Mailer}
require Logger
@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}")
date = Mobilizon.Service.HTTPSignatures.Signature.generate_date_header()
headers =
[{:Accept, "application/activity+json"}]
|> maybe_date_fetch(date)
|> sign_fetch(url, date)
Logger.debug("Fetch headers: #{inspect(headers)}")
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,
headers,
follow_redirect: true,
timeout: 10_000,
recv_timeout: 20_000
),
{:ok, data} <- Jason.decode(body),
{:origin_check, true} <- {:origin_check, origin_check?(url, data)},
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)}
{:origin_check, false} ->
Logger.warn("Object origin check failed")
{:error, "Object origin check failed"}
e ->
{:error, e}
end
end
@doc """
Getting an actor from url, eventually creating it
"""
@spec get_or_fetch_actor_by_url(String.t(), boolean) :: {:ok, Actor.t()} | {:error, String.t()}
def get_or_fetch_actor_by_url(url, preload \\ false)
def get_or_fetch_actor_by_url("https://www.w3.org/ns/activitystreams#Public", _preload) do
with %Actor{url: url} <- Relay.get_actor() do
get_or_fetch_actor_by_url(url)
end
end
def get_or_fetch_actor_by_url(url, preload) 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}
err ->
Logger.warn("Could not fetch by AP id")
Logger.debug(inspect(err))
{:error, "Could not fetch by AP id"}
end
end
end
@doc """
Create an activity of type `Create`
* Creates the object, which returns AS data
* Wraps ActivityStreams data into a `Create` activity
* Creates an `Mobilizon.Service.ActivityPub.Activity` from this
* Federates (asynchronously) the activity
* Returns the activity
"""
@spec create(atom(), map(), boolean, map()) :: {:ok, Activity.t(), struct()} | any()
def create(type, args, local \\ false, additional \\ %{}) do
Logger.debug("creating an activity")
Logger.debug(inspect(args))
with {:tombstone, nil} <- {:tombstone, check_for_tombstones(args)},
{:ok, entity, create_data} <-
(case type do
:event -> create_event(args, additional)
:comment -> create_comment(args, additional)
:group -> create_group(args, additional)
end),
{:ok, activity} <- create_activity(create_data, local),
:ok <- maybe_federate(activity) do
{:ok, activity, entity}
else
err ->
Logger.error("Something went wrong while creating an activity")
Logger.debug(inspect(err))
err
end
end
@doc """
Create an activity of type `Update`
* Updates the object, which returns AS data
* Wraps ActivityStreams data into a `Update` activity
* Creates an `Mobilizon.Service.ActivityPub.Activity` from this
* Federates (asynchronously) the activity
* Returns the activity
"""
@spec update(atom(), struct(), map(), boolean, map()) :: {:ok, Activity.t(), struct()} | any()
def update(type, old_entity, args, local \\ false, additional \\ %{}) do
Logger.debug("updating an activity")
Logger.debug(inspect(args))
with {:ok, entity, update_data} <-
(case type do
:event -> update_event(old_entity, args, additional)
:actor -> update_actor(old_entity, args, additional)
end),
{:ok, activity} <- create_activity(update_data, local),
:ok <- maybe_federate(activity) do
{:ok, activity, entity}
else
err ->
Logger.error("Something went wrong while creating an activity")
Logger.debug(inspect(err))
err
end
end
def accept(type, entity, local \\ true, additional \\ %{}) do
Logger.debug("We're accepting something")
{:ok, entity, update_data} =
case type do
:join -> accept_join(entity, additional)
:follow -> accept_follow(entity, additional)
end
with {:ok, activity} <- create_activity(update_data, local),
:ok <- maybe_federate(activity) do
{:ok, activity, entity}
else
err ->
Logger.error("Something went wrong while creating an activity")
Logger.debug(inspect(err))
err
end
end
def reject(type, entity, local \\ true, additional \\ %{}) do
{:ok, entity, update_data} =
case type do
:join -> reject_join(entity, additional)
:follow -> reject_follow(entity, additional)
end
with {:ok, activity} <- create_activity(update_data, local),
:ok <- maybe_federate(activity) do
{:ok, activity, entity}
else
err ->
Logger.error("Something went wrong while creating an activity")
Logger.debug(inspect(err))
err
end
end
def announce(
%Actor{} = actor,
object,
activity_id \\ nil,
local \\ true,
public \\ true
) do
with true <- is_public?(object),
{:ok, %Actor{id: object_owner_actor_id}} <- Actors.get_actor_by_url(object["actor"]),
{:ok, %Share{} = _share} <- Share.create(object["id"], actor.id, object_owner_actor_id),
announce_data <- make_announce_data(actor, object, activity_id, public),
{:ok, activity} <- create_activity(announce_data, local),
: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 <- 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{} = follower} <-
Actors.follow(followed, follower, activity_id, false),
follower_as_data <- Convertible.model_to_as(follower),
{:ok, activity} <- create_activity(follower_as_data, local),
:ok <- maybe_federate(activity) do
{:ok, activity, follower}
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} = follow} <- Actors.unfollow(followed, follower),
# We recreate the follow activity
follow_as_data <-
Convertible.model_to_as(%{follow | actor: follower, target_actor: followed}),
{:ok, follow_activity} <- create_activity(follow_as_data, local),
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 <- maybe_federate(activity) do
{:ok, activity, follow}
else
err ->
Logger.debug("Error while unfollowing an actor #{inspect(err)}")
err
end
end
def delete(object, local \\ true)
@spec delete(Event.t(), boolean) :: {:ok, Activity.t(), Event.t()}
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 audience <-
Audience.calculate_to_and_cc_from_mentions(event),
{:ok, %Event{} = event} <- Events.delete_event(event),
{:ok, true} <- Cachex.del(:activity_pub, "event_#{event.uuid}"),
{:ok, %Tombstone{} = _tombstone} <-
Tombstone.create_tombstone(%{uri: event.url, actor_id: actor.id}),
Share.delete_all_by_uri(event.url),
{:ok, activity} <- create_activity(Map.merge(data, audience), local),
:ok <- maybe_federate(activity) do
{:ok, activity, event}
end
end
@spec delete(Comment.t(), boolean) :: {:ok, Activity.t(), Comment.t()}
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 audience <-
Audience.calculate_to_and_cc_from_mentions(comment),
{:ok, %Comment{} = comment} <- Events.delete_comment(comment),
{:ok, true} <- Cachex.del(:activity_pub, "comment_#{comment.uuid}"),
{:ok, %Tombstone{} = _tombstone} <-
Tombstone.create_tombstone(%{uri: comment.url, actor_id: actor.id}),
Share.delete_all_by_uri(comment.url),
{:ok, activity} <- create_activity(Map.merge(data, audience), local),
:ok <- maybe_federate(activity) do
{:ok, activity, comment}
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, %Oban.Job{}} <- Actors.delete_actor(actor),
{:ok, activity} <- create_activity(data, local),
:ok <- maybe_federate(activity) do
{:ok, activity, actor}
end
end
def flag(args, local \\ false, _additional \\ %{}) do
with {:build_args, args} <- {:build_args, prepare_args_for_report(args)},
{:create_report, {:ok, %Report{} = report}} <-
{:create_report, Reports.create_report(args)},
report_as_data <- Convertible.model_to_as(report),
cc <- if(local, do: [report.reported.url], else: []),
report_as_data <- Map.merge(report_as_data, %{"to" => [], "cc" => cc}),
{:ok, activity} <- create_activity(report_as_data, local),
:ok <- maybe_federate(activity) do
Enum.each(Users.list_moderators(), fn moderator ->
moderator
|> Admin.report(report)
|> Mailer.deliver_later()
end)
{:ok, activity, report}
else
err ->
Logger.error("Something went wrong while creating an activity")
Logger.debug(inspect(err))
err
end
end
def join(object, actor, local \\ true, additional \\ %{})
def join(%Event{} = event, %Actor{} = actor, local, additional) do
# TODO Refactor me for federation
with {:maximum_attendee_capacity, true} <-
{:maximum_attendee_capacity, check_attendee_capacity(event)},
{:ok, %Participant{} = participant} <-
Mobilizon.Events.create_participant(%{
role: :not_approved,
event_id: event.id,
actor_id: actor.id,
url: Map.get(additional, :url)
}),
join_data <- Convertible.model_to_as(participant),
audience <-
Audience.calculate_to_and_cc_from_mentions(participant),
{:ok, activity} <- create_activity(Map.merge(join_data, audience), local),
:ok <- maybe_federate(activity) do
if event.local && Mobilizon.Events.get_default_participant_role(event) === :participant do
accept(
:join,
participant,
true,
%{"actor" => event.organizer_actor.url}
)
else
{:ok, activity, participant}
end
end
end
# TODO: Implement me
def join(%Actor{type: :Group} = _group, %Actor{} = _actor, _local, _additional) do
:error
end
defp check_attendee_capacity(%Event{options: options} = event) do
with maximum_attendee_capacity <-
Map.get(options, :maximum_attendee_capacity) || 0 do
maximum_attendee_capacity == 0 ||
Mobilizon.Events.count_participant_participants(event.id) < maximum_attendee_capacity
end
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} <-
Events.delete_participant(participant),
leave_data <- %{
"type" => "Leave",
# If it's an exclusion it should be something else
"actor" => actor_url,
"object" => event_url,
"id" => "#{MobilizonWeb.Endpoint.url()}/leave/event/#{participant.id}"
},
audience <-
Audience.calculate_to_and_cc_from_mentions(participant),
{:ok, activity} <- create_activity(Map.merge(leave_data, audience), local),
:ok <- maybe_federate(activity) do
{:ok, activity, participant}
end
end
@doc """
Create an actor locally by its 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 its 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
@spec is_create_activity?(Activity.t()) :: boolean
defp is_create_activity?(%Activity{data: %{"type" => "Create"}}), do: true
defp is_create_activity?(_), do: false
@doc """
Publish an activity to all appropriated audiences inboxes
"""
@spec publish(Actor.t(), Activity.t()) :: :ok
def publish(actor, activity) do
Logger.debug("Publishing an activity")
Logger.debug(inspect(activity))
public = is_public?(activity)
Logger.debug("is public ? #{public}")
if public && is_create_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
@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, %{
"(request-target)": "post #{path}",
host: host,
"content-length": byte_size(json),
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 its 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")
Mobilizon.Service.ActivityPub.Converter.Actor.as_to_model_data(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 """
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
# Get recipients for an activity or object
@spec get_recipients(map()) :: list()
defp get_recipients(data) do
(data["to"] || []) ++ (data["cc"] || [])
end
@spec create_event(map(), map()) :: {:ok, map()}
defp create_event(args, additional) do
with args <- prepare_args_for_event(args),
{:ok, %Event{} = event} <- Events.create_event(args),
event_as_data <- Convertible.model_to_as(event),
audience <-
Audience.calculate_to_and_cc_from_mentions(event),
create_data <-
make_create_data(event_as_data, Map.merge(audience, additional)) do
{:ok, event, create_data}
end
end
@spec create_comment(map(), map()) :: {:ok, map()}
defp create_comment(args, additional) do
with args <- prepare_args_for_comment(args),
{:ok, %Comment{} = comment} <- Events.create_comment(args),
comment_as_data <- Convertible.model_to_as(comment),
audience <-
Audience.calculate_to_and_cc_from_mentions(comment),
create_data <-
make_create_data(comment_as_data, Map.merge(audience, additional)) do
{:ok, comment, create_data}
end
end
@spec create_group(map(), map()) :: {:ok, map()}
defp create_group(args, additional) do
with args <- prepare_args_for_group(args),
{:ok, %Actor{type: :Group} = group} <- Actors.create_group(args),
group_as_data <- Convertible.model_to_as(group),
audience <- %{"to" => ["https://www.w3.org/ns/activitystreams#Public"], "cc" => []},
create_data <-
make_create_data(group_as_data, Map.merge(audience, additional)) do
{:ok, group, create_data}
end
end
@spec check_for_tombstones(map()) :: Tombstone.t() | nil
defp check_for_tombstones(%{url: url}), do: Tombstone.find_tombstone(url)
defp check_for_tombstones(_), do: nil
@spec update_event(Event.t(), map(), map()) ::
{:ok, Event.t(), Activity.t()} | any()
defp update_event(
%Event{} = old_event,
args,
additional
) do
with args <- prepare_args_for_event(args),
{:ok, %Event{} = new_event} <- Events.update_event(old_event, args),
{:ok, true} <- Cachex.del(:activity_pub, "event_#{new_event.uuid}"),
event_as_data <- Convertible.model_to_as(new_event),
audience <-
Audience.calculate_to_and_cc_from_mentions(new_event),
update_data <- make_update_data(event_as_data, Map.merge(audience, additional)) do
{:ok, new_event, update_data}
else
err ->
Logger.error("Something went wrong while creating an update activity")
Logger.debug(inspect(err))
err
end
end
@spec update_actor(Actor.t(), map(), map()) ::
{:ok, Actor.t(), Activity.t()} | any()
defp update_actor(%Actor{} = old_actor, args, additional) do
with {:ok, %Actor{} = new_actor} <- Actors.update_actor(old_actor, args),
actor_as_data <- Convertible.model_to_as(new_actor),
{:ok, true} <- Cachex.del(:activity_pub, "actor_#{new_actor.preferred_username}"),
audience <-
Audience.calculate_to_and_cc_from_mentions(new_actor),
additional <- Map.merge(additional, %{"actor" => old_actor.url}),
update_data <- make_update_data(actor_as_data, Map.merge(audience, additional)) do
{:ok, new_actor, update_data}
end
end
@spec accept_follow(Follower.t(), map()) ::
{:ok, Follower.t(), Activity.t()} | any()
defp accept_follow(
%Follower{} = follower,
additional
) do
with {:ok, %Follower{} = follower} <- Actors.update_follower(follower, %{approved: true}),
follower_as_data <- Convertible.model_to_as(follower),
update_data <-
make_accept_join_data(
follower_as_data,
Map.merge(additional, %{
"id" => "#{MobilizonWeb.Endpoint.url()}/accept/follow/#{follower.id}",
"to" => [follower.actor.url],
"cc" => [],
"actor" => follower.target_actor.url
})
) do
{:ok, follower, update_data}
else
err ->
Logger.error("Something went wrong while creating an update activity")
Logger.debug(inspect(err))
err
end
end
@spec accept_join(Participant.t(), map()) ::
{:ok, Participant.t(), Activity.t()} | any()
defp accept_join(
%Participant{} = participant,
additional
) do
with {:ok, %Participant{} = participant} <-
Events.update_participant(participant, %{role: :participant}),
Absinthe.Subscription.publish(MobilizonWeb.Endpoint, participant.actor,
event_person_participation_changed: participant.actor.id
),
participant_as_data <- Convertible.model_to_as(participant),
audience <-
Audience.calculate_to_and_cc_from_mentions(participant),
update_data <-
make_accept_join_data(
participant_as_data,
Map.merge(Map.merge(audience, additional), %{
"id" => "#{MobilizonWeb.Endpoint.url()}/accept/join/#{participant.id}"
})
) do
{:ok, participant, update_data}
else
err ->
Logger.error("Something went wrong while creating an update activity")
Logger.debug(inspect(err))
err
end
end
@spec reject_join(Participant.t(), map()) ::
{:ok, Participant.t(), Activity.t()} | any()
defp reject_join(%Participant{} = participant, additional) do
with {:ok, %Participant{} = participant} <-
Events.update_participant(participant, %{approved: false, role: :rejected}),
Absinthe.Subscription.publish(MobilizonWeb.Endpoint, participant.actor,
event_person_participation_changed: participant.actor.id
),
participant_as_data <- Convertible.model_to_as(participant),
audience <-
participant
|> Audience.calculate_to_and_cc_from_mentions()
|> Map.merge(additional),
reject_data <- %{
"type" => "Reject",
"object" => participant_as_data
},
update_data <-
reject_data
|> Map.merge(audience)
|> Map.merge(%{
"id" => "#{MobilizonWeb.Endpoint.url()}/reject/join/#{participant.id}"
}) do
{:ok, participant, update_data}
else
err ->
Logger.error("Something went wrong while creating an update activity")
Logger.debug(inspect(err))
err
end
end
@spec reject_follow(Follower.t(), map()) ::
{:ok, Follower.t(), Activity.t()} | any()
defp reject_follow(%Follower{} = follower, additional) do
with {:ok, %Follower{} = follower} <- Actors.delete_follower(follower),
follower_as_data <- Convertible.model_to_as(follower),
audience <-
follower.actor |> Audience.calculate_to_and_cc_from_mentions() |> Map.merge(additional),
reject_data <- %{
"to" => follower.actor.url,
"type" => "Reject",
"actor" => follower.actor.url,
"object" => follower_as_data
},
update_data <-
reject_data
|> Map.merge(audience)
|> Map.merge(%{
"id" => "#{MobilizonWeb.Endpoint.url()}/reject/follow/#{follower.id}"
}) do
{:ok, follower, update_data}
else
err ->
Logger.error("Something went wrong while creating an update activity")
Logger.debug(inspect(err))
err
end
end
# Prepare and sanitize arguments for events
defp prepare_args_for_event(args) do
# If title is not set: we are not updating it
args =
if Map.has_key?(args, :title) && !is_nil(args.title),
do: Map.update(args, :title, "", &String.trim(HtmlSanitizeEx.strip_tags(&1))),
else: args
# If we've been given a description (we might not get one if updating)
# sanitize it, HTML it, and extract tags & mentions from it
args =
if Map.has_key?(args, :description) && !is_nil(args.description) do
{description, mentions, tags} =
APIUtils.make_content_html(
String.trim(args.description),
Map.get(args, :tags, []),
"text/html"
)
mentions = ConverterUtils.fetch_mentions(Map.get(args, :mentions, []) ++ mentions)
Map.merge(args, %{
description: description,
mentions: mentions,
tags: tags
})
else
args
end
Map.update(args, :tags, [], &ConverterUtils.fetch_tags/1)
end
# Prepare and sanitize arguments for comments
defp prepare_args_for_comment(args) do
with in_reply_to_comment <-
args |> Map.get(:in_reply_to_comment_id) |> Events.get_comment_with_preload(),
event <- args |> Map.get(:event_id) |> handle_event_for_comment(),
args <- Map.update(args, :visibility, :public, & &1),
{text, mentions, tags} <-
APIUtils.make_content_html(
args |> Map.get(:text, "") |> String.trim(),
# Can't put additional tags on a comment
[],
"text/html"
),
tags <- ConverterUtils.fetch_tags(tags),
mentions <- Map.get(args, :mentions, []) ++ ConverterUtils.fetch_mentions(mentions),
args <-
Map.merge(args, %{
actor_id: Map.get(args, :actor_id),
text: text,
mentions: mentions,
tags: tags,
event: event,
in_reply_to_comment: in_reply_to_comment,
in_reply_to_comment_id:
if(is_nil(in_reply_to_comment), do: nil, else: Map.get(in_reply_to_comment, :id)),
origin_comment_id:
if(is_nil(in_reply_to_comment),
do: nil,
else: Comment.get_thread_id(in_reply_to_comment)
)
}) do
args
end
end
@spec handle_event_for_comment(String.t() | integer() | nil) :: Event.t() | nil
defp handle_event_for_comment(event_id) when not is_nil(event_id) do
case Events.get_event_with_preload(event_id) do
{:ok, %Event{} = event} -> event
{:error, :event_not_found} -> nil
end
end
defp handle_event_for_comment(nil), do: nil
defp prepare_args_for_group(args) do
with preferred_username <-
args |> Map.get(:preferred_username) |> HtmlSanitizeEx.strip_tags() |> String.trim(),
summary <- args |> Map.get(:summary, "") |> String.trim(),
{summary, _mentions, _tags} <-
summary |> String.trim() |> APIUtils.make_content_html([], "text/html") do
%{args | preferred_username: preferred_username, summary: summary}
end
end
defp prepare_args_for_report(args) do
with {:reporter, %Actor{} = reporter_actor} <-
{:reporter, Actors.get_actor!(args.reporter_id)},
{:reported, %Actor{} = reported_actor} <-
{:reported, Actors.get_actor!(args.reported_id)},
content <- HtmlSanitizeEx.strip_tags(args.content),
event <- Events.get_comment(Map.get(args, :event_id)),
{:get_report_comments, comments} <-
{:get_report_comments,
Events.list_comments_by_actor_and_ids(
reported_actor.id,
Map.get(args, :comments_ids, [])
)} do
Map.merge(args, %{
reporter: reporter_actor,
reported: reported_actor,
content: content,
event: event,
comments: comments
})
end
end
end

185
lib/service/activity_pub/audience.ex
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@@ -1,185 +0,0 @@
defmodule Mobilizon.Service.ActivityPub.Audience do
@moduledoc """
Tools for calculating content audience
"""
alias Mobilizon.Actors
alias Mobilizon.Actors.Actor
alias Mobilizon.Events.Comment
alias Mobilizon.Events.Event
alias Mobilizon.Events.Participant
alias Mobilizon.Share
require Logger
@ap_public "https://www.w3.org/ns/activitystreams#Public"
@doc """
Determines the full audience based on mentions for a public audience
Audience is:
* `to` : the mentioned actors, the eventual actor we're replying to and the public
* `cc` : the actor's followers
"""
@spec get_to_and_cc(Actor.t(), list(), String.t()) :: {list(), list()}
def get_to_and_cc(%Actor{} = actor, mentions, :public) do
to = [@ap_public | mentions]
cc = [actor.followers_url]
{to, cc}
end
@doc """
Determines the full audience based on mentions based on a unlisted audience
Audience is:
* `to` : the mentioned actors, actor's followers and the eventual actor we're replying to
* `cc` : public
"""
@spec get_to_and_cc(Actor.t(), list(), String.t()) :: {list(), list()}
def get_to_and_cc(%Actor{} = actor, mentions, :unlisted) do
to = [actor.followers_url | mentions]
cc = [@ap_public]
{to, cc}
end
@doc """
Determines the full audience based on mentions based on a private audience
Audience is:
* `to` : the mentioned actors, actor's followers and the eventual actor we're replying to
* `cc` : none
"""
@spec get_to_and_cc(Actor.t(), list(), String.t()) :: {list(), list()}
def get_to_and_cc(%Actor{} = actor, mentions, :private) do
{to, cc} = get_to_and_cc(actor, mentions, :direct)
{[actor.followers_url | to], cc}
end
@doc """
Determines the full audience based on mentions based on a direct audience
Audience is:
* `to` : the mentioned actors and the eventual actor we're replying to
* `cc` : none
"""
@spec get_to_and_cc(Actor.t(), list(), String.t()) :: {list(), list()}
def get_to_and_cc(_actor, mentions, :direct) do
{mentions, []}
end
def get_to_and_cc(_actor, mentions, {:list, _}) do
{mentions, []}
end
# def get_addressed_actors(_, to) when is_list(to) do
# Actors.get(to)
# end
def get_addressed_actors(mentioned_users, _), do: mentioned_users
def calculate_to_and_cc_from_mentions(%Comment{} = comment) do
with mentioned_actors <- Enum.map(comment.mentions, &process_mention/1),
addressed_actors <- get_addressed_actors(mentioned_actors, nil),
{to, cc} <- get_to_and_cc(comment.actor, addressed_actors, comment.visibility),
{to, cc} <- {Enum.uniq(to ++ add_in_reply_to(comment.in_reply_to_comment)), cc},
{to, cc} <- {Enum.uniq(to ++ add_event_author(comment.event)), cc},
{to, cc} <-
{to,
Enum.uniq(
cc ++
add_comments_authors([comment.origin_comment]) ++
add_shares_actors_followers(comment.url)
)} do
%{"to" => to, "cc" => cc}
end
end
def calculate_to_and_cc_from_mentions(%Event{} = event) do
with mentioned_actors <- Enum.map(event.mentions, &process_mention/1),
addressed_actors <- get_addressed_actors(mentioned_actors, nil),
{to, cc} <- get_to_and_cc(event.organizer_actor, addressed_actors, event.visibility),
{to, cc} <-
{to,
Enum.uniq(
cc ++ add_comments_authors(event.comments) ++ add_shares_actors_followers(event.url)
)} do
%{"to" => to, "cc" => cc}
end
end
def calculate_to_and_cc_from_mentions(%Participant{} = participant) do
participant = Mobilizon.Storage.Repo.preload(participant, [:actor, :event])
actor_participants_urls =
participant.event.id
|> Mobilizon.Events.list_actors_participants_for_event()
|> Enum.map(& &1.url)
%{"to" => [participant.actor.url], "cc" => actor_participants_urls}
end
def calculate_to_and_cc_from_mentions(%Actor{} = actor) do
%{
"to" => [@ap_public],
"cc" => [actor.followers_url] ++ add_actors_that_had_our_content(actor.id)
}
end
defp add_in_reply_to(%Comment{actor: %Actor{url: url}} = _comment), do: [url]
defp add_in_reply_to(%Event{organizer_actor: %Actor{url: url}} = _event), do: [url]
defp add_in_reply_to(_), do: []
defp add_event_author(nil), do: []
defp add_event_author(%Event{} = event) do
[Mobilizon.Storage.Repo.preload(event, [:organizer_actor]).organizer_actor.url]
end
defp add_comment_author(nil), do: nil
defp add_comment_author(%Comment{} = comment) do
case Mobilizon.Storage.Repo.preload(comment, [:actor]) do
%Comment{actor: %Actor{url: url}} ->
url
_err ->
nil
end
end
defp add_comments_authors(comments) do
authors =
comments
|> Enum.map(&add_comment_author/1)
|> Enum.filter(& &1)
authors
end
@spec add_shares_actors_followers(String.t()) :: list(String.t())
defp add_shares_actors_followers(uri) do
uri
|> Share.get_actors_by_share_uri()
|> Enum.map(&Actors.list_followers_actors_for_actor/1)
|> List.flatten()
|> Enum.map(& &1.url)
|> Enum.uniq()
end
defp add_actors_that_had_our_content(actor_id) do
actor_id
|> Share.get_actors_by_owner_actor_id()
|> Enum.map(&Actors.list_followers_actors_for_actor/1)
|> List.flatten()
|> Enum.map(& &1.url)
|> Enum.uniq()
end
defp process_mention({_, mentioned_actor}), do: mentioned_actor.url
defp process_mention(%{actor_id: actor_id}) do
with %Actor{url: url} <- Actors.get_actor(actor_id) do
url
end
end
end

11
lib/service/activity_pub/converter.ex
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@@ -1,11 +0,0 @@
defmodule Mobilizon.Service.ActivityPub.Converter do
@moduledoc """
Converter behaviour.
This module allows to convert from ActivityStream format to our own internal
one, and back.
"""
@callback as_to_model_data(map) :: map
@callback model_to_as(struct) :: map
end

114
lib/service/activity_pub/converter/actor.ex
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defmodule Mobilizon.Service.ActivityPub.Converter.Actor do
@moduledoc """
Actor converter.
This module allows to convert events from ActivityStream format to our own
internal one, and back.
"""
alias Mobilizon.Actors.Actor, as: ActorModel
alias Mobilizon.Service.ActivityPub.{Converter, Convertible, Utils}
@behaviour Converter
defimpl Convertible, for: ActorModel do
alias Mobilizon.Service.ActivityPub.Converter.Actor, as: ActorConverter
defdelegate model_to_as(actor), to: ActorConverter
end
@doc """
Converts an AP object data to our internal data structure.
"""
@impl Converter
@spec as_to_model_data(map) :: map
def as_to_model_data(data) do
avatar =
data["icon"]["url"] &&
%{
"name" => data["icon"]["name"] || "avatar",
"url" => MobilizonWeb.MediaProxy.url(data["icon"]["url"])
}
banner =
data["image"]["url"] &&
%{
"name" => data["image"]["name"] || "banner",
"url" => MobilizonWeb.MediaProxy.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 """
Convert an actor struct to an ActivityStream representation.
"""
@impl Converter
@spec model_to_as(ActorModel.t()) :: map
def model_to_as(%ActorModel{} = actor) do
actor_data = %{
"id" => actor.url,
"type" => actor.type,
"preferredUsername" => actor.preferred_username,
"name" => actor.name,
"summary" => actor.summary,
"following" => actor.following_url,
"followers" => actor.followers_url,
"inbox" => actor.inbox_url,
"outbox" => actor.outbox_url,
"url" => actor.url,
"endpoints" => %{
"sharedInbox" => actor.shared_inbox_url
},
"manuallyApprovesFollowers" => actor.manually_approves_followers,
"publicKey" => %{
"id" => "#{actor.url}#main-key",
"owner" => actor.url,
"publicKeyPem" =>
if(is_nil(actor.domain) and not is_nil(actor.keys),
do: Utils.pem_to_public_key_pem(actor.keys),
else: actor.keys
)
}
}
actor_data =
if is_nil(actor.avatar) do
actor_data
else
Map.put(actor_data, "icon", %{
"type" => "Image",
"mediaType" => actor.avatar.content_type,
"url" => actor.avatar.url
})
end
if is_nil(actor.banner) do
actor_data
else
Map.put(actor_data, "image", %{
"type" => "Image",
"mediaType" => actor.banner.content_type,
"url" => actor.banner.url
})
end
end
end

78
lib/service/activity_pub/converter/address.ex
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defmodule Mobilizon.Service.ActivityPub.Converter.Address do
@moduledoc """
Address converter.
This module allows to convert reports from ActivityStream format to our own
internal one, and back.
"""
alias Mobilizon.Addresses.Address, as: AddressModel
alias Mobilizon.Service.ActivityPub.Converter
@behaviour Converter
@doc """
Converts an AP object data to our internal data structure.
"""
@impl Converter
@spec as_to_model_data(map) :: map
def as_to_model_data(object) do
res = %{
"description" => object["name"],
"url" => object["url"]
}
res =
if is_nil(object["address"]) do
res
else
Map.merge(res, %{
"country" => object["address"]["addressCountry"],
"postal_code" => object["address"]["postalCode"],
"region" => object["address"]["addressRegion"],
"street" => object["address"]["streetAddress"],
"locality" => object["address"]["addressLocality"]
})
end
if is_nil(object["latitude"]) or is_nil(object["longitude"]) do
res
else
geo = %Geo.Point{
coordinates: {object["latitude"], object["longitude"]},
srid: 4326
}
Map.put(res, "geom", geo)
end
end
@doc """
Convert an event struct to an ActivityStream representation.
"""
@impl Converter
@spec model_to_as(AddressModel.t()) :: map
def model_to_as(%AddressModel{} = 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
res
|> Map.put("latitude", address.geom.coordinates |> elem(0))
|> Map.put("longitude", address.geom.coordinates |> elem(1))
end
end
end

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lib/service/activity_pub/converter/comment.ex
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defmodule Mobilizon.Service.ActivityPub.Converter.Comment do
@moduledoc """
Comment converter.
This module allows to convert events from ActivityStream format to our own
internal one, and back.
"""
alias Mobilizon.Actors.Actor
alias Mobilizon.Events.Comment, as: CommentModel
alias Mobilizon.Events.Event
alias Mobilizon.Service.ActivityPub
alias Mobilizon.Service.ActivityPub.{Converter, Convertible, Visibility}
alias Mobilizon.Service.ActivityPub.Converter.Utils, as: ConverterUtils
alias Mobilizon.Tombstone, as: TombstoneModel
require Logger
@behaviour Converter
defimpl Convertible, for: CommentModel do
alias Mobilizon.Service.ActivityPub.Converter.Comment, as: CommentConverter
defdelegate model_to_as(comment), to: CommentConverter
end
@doc """
Converts an AP object data to our internal data structure.
"""
@impl Converter
@spec as_to_model_data(map) :: {:ok, map} | {:error, any()}
def as_to_model_data(object) do
Logger.debug("We're converting raw ActivityStream data to a comment entity")
Logger.debug(inspect(object))
with author_url <- Map.get(object, "actor") || Map.get(object, "attributedTo"),
{:ok, %Actor{id: actor_id, domain: domain}} <-
ActivityPub.get_or_fetch_actor_by_url(author_url),
{:tags, tags} <- {:tags, ConverterUtils.fetch_tags(Map.get(object, "tag", []))},
{:mentions, mentions} <-
{:mentions, ConverterUtils.fetch_mentions(Map.get(object, "tag", []))} do
Logger.debug("Inserting full comment")
Logger.debug(inspect(object))
data = %{
text: object["content"],
url: object["id"],
actor_id: actor_id,
in_reply_to_comment_id: nil,
event_id: nil,
uuid: object["uuid"],
tags: tags,
mentions: mentions,
local: is_nil(domain),
visibility: if(Visibility.is_public?(object), do: :public, else: :private)
}
# We fetch the parent object
Logger.debug("We're fetching the parent object")
data =
if Map.has_key?(object, "inReplyTo") && object["inReplyTo"] != nil &&
object["inReplyTo"] != "" do
Logger.debug(fn -> "Object has inReplyTo #{object["inReplyTo"]}" end)
case ActivityPub.fetch_object_from_url(object["inReplyTo"]) do
# Reply to an event (Event)
{:ok, %Event{id: id}} ->
Logger.debug("Parent object is an event")
data |> Map.put(:event_id, id)
# Reply to a comment (Comment)
{:ok, %CommentModel{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 |> CommentModel.get_thread_id())
|> Map.put(:event_id, comment.event_id)
# Anything else is kind of a MP
{:error, parent} ->
Logger.warn("Parent object is something we don't handle")
Logger.debug(inspect(parent))
data
end
else
Logger.debug("No parent object for this comment")
data
end
{:ok, data}
else
err ->
{:error, err}
end
end
@doc """
Make an AS comment object from an existing `Comment` structure.
"""
@impl Converter
@spec model_to_as(CommentModel.t()) :: map
def model_to_as(%CommentModel{deleted_at: nil} = comment) do
to =
if comment.visibility == :public,
do: ["https://www.w3.org/ns/activitystreams#Public"],
else: [comment.actor.followers_url]
object = %{
"type" => "Note",
"to" => to,
"cc" => [],
"content" => comment.text,
"mediaType" => "text/html",
"actor" => comment.actor.url,
"attributedTo" => comment.actor.url,
"uuid" => comment.uuid,
"id" => comment.url,
"tag" =>
ConverterUtils.build_mentions(comment.mentions) ++ ConverterUtils.build_tags(comment.tags)
}
cond do
comment.in_reply_to_comment ->
Map.put(object, "inReplyTo", comment.in_reply_to_comment.url)
comment.event ->
Map.put(object, "inReplyTo", comment.event.url)
true ->
object
end
end
@impl Converter
@spec model_to_as(CommentModel.t()) :: map
@doc """
A "soft-deleted" comment is a tombstone
"""
def model_to_as(%CommentModel{} = comment) do
Convertible.model_to_as(%TombstoneModel{
uri: comment.url,
inserted_at: comment.deleted_at
})
end
end

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lib/service/activity_pub/converter/event.ex
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defmodule Mobilizon.Service.ActivityPub.Converter.Event do
@moduledoc """
Event converter.
This module allows to convert events from ActivityStream format to our own
internal one, and back.
"""
alias Mobilizon.Addresses
alias Mobilizon.Actors.Actor
alias Mobilizon.Addresses.Address
alias Mobilizon.Events.Event, as: EventModel
alias Mobilizon.Media.Picture
alias Mobilizon.Service.ActivityPub
alias Mobilizon.Service.ActivityPub.{Converter, Convertible}
alias Mobilizon.Service.ActivityPub.Converter.Address, as: AddressConverter
alias Mobilizon.Service.ActivityPub.Converter.Picture, as: PictureConverter
alias Mobilizon.Service.ActivityPub.Converter.Utils, as: ConverterUtils
require Logger
@behaviour Converter
defimpl Convertible, for: EventModel do
alias Mobilizon.Service.ActivityPub.Converter.Event, as: EventConverter
defdelegate model_to_as(event), to: EventConverter
end
@doc """
Converts an AP object data to our internal data structure.
"""
@impl Converter
@spec as_to_model_data(map) :: {:ok, map()} | {:error, any()}
def as_to_model_data(object) do
Logger.debug("event as_to_model_data")
Logger.debug(inspect(object))
with author_url <- Map.get(object, "actor") || Map.get(object, "attributedTo"),
{:actor, {:ok, %Actor{id: actor_id, domain: actor_domain}}} <-
{:actor, ActivityPub.get_or_fetch_actor_by_url(author_url)},
{:address, address_id} <-
{:address, get_address(object["location"])},
{:tags, tags} <- {:tags, ConverterUtils.fetch_tags(object["tag"])},
{:mentions, mentions} <- {:mentions, ConverterUtils.fetch_mentions(object["tag"])},
{:visibility, visibility} <- {:visibility, get_visibility(object)},
{:options, options} <- {:options, get_options(object)} do
picture_id =
with true <- Map.has_key?(object, "attachment") && length(object["attachment"]) > 0,
{:ok, %Picture{id: picture_id}} <-
object["attachment"]
|> hd
|> PictureConverter.find_or_create_picture(actor_id) do
picture_id
else
_err ->
nil
end
entity = %{
title: object["name"],
description: object["content"],
organizer_actor_id: actor_id,
picture_id: picture_id,
begins_on: object["startTime"],
ends_on: object["endTime"],
category: object["category"],
visibility: visibility,
join_options: Map.get(object, "joinMode", "free"),
local: is_nil(actor_domain),
options: options,
status: object |> Map.get("ical:status", "CONFIRMED") |> String.downcase(),
online_address: object["onlineAddress"],
phone_address: object["phoneAddress"],
draft: false,
url: object["id"],
uuid: object["uuid"],
tags: tags,
mentions: mentions,
physical_address_id: address_id,
updated_at: object["updated"],
publish_at: object["published"]
}
{:ok, entity}
else
error ->
{:error, error}
end
end
@doc """
Convert an event struct to an ActivityStream representation.
"""
@impl Converter
@spec model_to_as(EventModel.t()) :: map
def model_to_as(%EventModel{} = event) do
to =
if event.visibility == :public,
do: ["https://www.w3.org/ns/activitystreams#Public"],
else: [event.organizer_actor.followers_url]
res = %{
"type" => "Event",
"to" => to,
"cc" => [],
"attributedTo" => event.organizer_actor.url,
"name" => event.title,
"actor" => event.organizer_actor.url,
"uuid" => event.uuid,
"category" => event.category,
"content" => event.description,
"published" => (event.publish_at || event.inserted_at) |> date_to_string(),
"updated" => event.updated_at |> date_to_string(),
"mediaType" => "text/html",
"startTime" => event.begins_on |> date_to_string(),
"joinMode" => to_string(event.join_options),
"endTime" => event.ends_on |> date_to_string(),
"tag" => event.tags |> ConverterUtils.build_tags(),
"maximumAttendeeCapacity" => event.options.maximum_attendee_capacity,
"repliesModerationOption" => event.options.comment_moderation,
"commentsEnabled" => event.options.comment_moderation == :allow_all,
# "draft" => event.draft,
"ical:status" => event.status |> to_string |> String.upcase(),
"id" => event.url,
"url" => event.url
}
res =
if is_nil(event.physical_address),
do: res,
else: Map.put(res, "location", AddressConverter.model_to_as(event.physical_address))
if is_nil(event.picture),
do: res,
else: Map.put(res, "attachment", [PictureConverter.model_to_as(event.picture)])
end
# Get only elements that we have in EventOptions
@spec get_options(map) :: map
defp get_options(object) do
%{
maximum_attendee_capacity: object["maximumAttendeeCapacity"],
comment_moderation:
Map.get(
object,
"repliesModerationOption",
if(Map.get(object, "commentsEnabled", true), do: :allow_all, else: :closed)
)
}
end
@spec get_address(map | binary | nil) :: integer | nil
defp get_address(address_url) when is_bitstring(address_url) do
get_address(%{"id" => address_url})
end
defp get_address(%{"id" => url} = map) when is_map(map) and is_binary(url) do
Logger.debug("Address with an URL, let's check against our own database")
case Addresses.get_address_by_url(url) do
%Address{id: address_id} ->
address_id
_ ->
Logger.debug("not in our database, let's try to create it")
map = Map.put(map, "url", map["id"])
do_get_address(map)
end
end
defp get_address(map) when is_map(map) do
do_get_address(map)
end
defp get_address(nil), do: nil
@spec do_get_address(map) :: integer | nil
defp do_get_address(map) do
map = Mobilizon.Service.ActivityPub.Converter.Address.as_to_model_data(map)
case Addresses.create_address(map) do
{:ok, %Address{id: address_id}} ->
address_id
_ ->
nil
end
end
@ap_public "https://www.w3.org/ns/activitystreams#Public"
defp get_visibility(object), do: if(@ap_public in object["to"], do: :public, else: :unlisted)
@spec date_to_string(DateTime.t() | nil) :: String.t()
defp date_to_string(nil), do: nil
defp date_to_string(%DateTime{} = date), do: DateTime.to_iso8601(date)
end

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lib/service/activity_pub/converter/flag.ex
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defmodule Mobilizon.Service.ActivityPub.Converter.Flag do
@moduledoc """
Flag converter.
This module allows to convert reports from ActivityStream format to our own
internal one, and back.
Note: Reports are named Flag in AS.
"""
alias Mobilizon.Actors
alias Mobilizon.Actors.Actor
alias Mobilizon.Events
alias Mobilizon.Events.Event
alias Mobilizon.Reports.Report
alias Mobilizon.Service.ActivityPub.Converter
alias Mobilizon.Service.ActivityPub.Convertible
alias Mobilizon.Service.ActivityPub.Relay
@behaviour Converter
defimpl Convertible, for: Report do
alias Mobilizon.Service.ActivityPub.Converter.Flag, as: FlagConverter
defdelegate model_to_as(report), to: FlagConverter
end
@doc """
Converts an AP object data to our internal data structure.
"""
@impl Converter
@spec as_to_model_data(map) :: map
def as_to_model_data(object) do
with params <- as_to_model(object) do
%{
"reporter_id" => params["reporter"].id,
"uri" => params["uri"],
"content" => params["content"],
"reported_id" => params["reported"].id,
"event_id" => (!is_nil(params["event"]) && params["event"].id) || nil,
"comments" => params["comments"]
}
end
end
@doc """
Convert an event struct to an ActivityStream representation
"""
@impl Converter
@spec model_to_as(Report.t()) :: map
def model_to_as(%Report{} = report) do
object = [report.reported.url] ++ Enum.map(report.comments, fn comment -> comment.url end)
object = if report.event, do: object ++ [report.event.url], else: object
%{
"type" => "Flag",
"actor" => Relay.get_actor().url,
"id" => report.url,
"content" => report.content,
"object" => object
}
end
@spec as_to_model(map) :: map
def as_to_model(%{"object" => objects} = object) do
with {:ok, %Actor{} = reporter} <- Actors.get_actor_by_url(object["actor"]),
%Actor{} = reported <-
Enum.reduce_while(objects, nil, fn url, _ ->
case Actors.get_actor_by_url(url) do
{:ok, %Actor{} = actor} ->
{:halt, actor}
_ ->
{:cont, nil}
end
end),
event <-
Enum.reduce_while(objects, nil, fn url, _ ->
case Events.get_event_by_url(url) do
%Event{} = event ->
{:halt, event}
_ ->
{:cont, nil}
end
end),
# Remove the reported actor and the event from the object list.
comments <-
Enum.filter(objects, fn url ->
!(url == reported.url || (!is_nil(event) && event.url == url))
end),
comments <- Enum.map(comments, &Events.get_comment_from_url/1) do
%{
"reporter" => reporter,
"uri" => object["id"],
"content" => object["content"],
"reported" => reported,
"event" => event,
"comments" => comments
}
end
end
end

36
lib/service/activity_pub/converter/follower.ex
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defmodule Mobilizon.Service.ActivityPub.Converter.Follower do
@moduledoc """
Participant converter.
This module allows to convert followers from ActivityStream format to our own
internal one, and back.
"""
alias Mobilizon.Actors.Follower, as: FollowerModel
alias Mobilizon.Service.ActivityPub.Convertible
alias Mobilizon.Actors.Actor
defimpl Convertible, for: FollowerModel do
alias Mobilizon.Service.ActivityPub.Converter.Follower, as: FollowerConverter
defdelegate model_to_as(follower), to: FollowerConverter
end
@doc """
Convert an follow struct to an ActivityStream representation.
"""
@spec model_to_as(FollowerModel.t()) :: map
def model_to_as(
%FollowerModel{actor: %Actor{} = actor, target_actor: %Actor{} = target_actor} = follower
) do
%{
"type" => "Follow",
"actor" => actor.url,
"to" => [target_actor.url],
"cc" => ["https://www.w3.org/ns/activitystreams#Public"],
"object" => target_actor.url,
"id" => follower.url
}
end
end

31
lib/service/activity_pub/converter/participant.ex
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defmodule Mobilizon.Service.ActivityPub.Converter.Participant do
@moduledoc """
Participant converter.
This module allows to convert reports from ActivityStream format to our own
internal one, and back.
"""
alias Mobilizon.Events.Participant, as: ParticipantModel
alias Mobilizon.Service.ActivityPub.Convertible
defimpl Convertible, for: ParticipantModel do
alias Mobilizon.Service.ActivityPub.Converter.Participant, as: ParticipantConverter
defdelegate model_to_as(participant), to: ParticipantConverter
end
@doc """
Convert an event struct to an ActivityStream representation.
"""
@spec model_to_as(ParticipantModel.t()) :: map
def model_to_as(%ParticipantModel{} = participant) do
%{
"type" => "Join",
"id" => participant.url,
"actor" => participant.actor.url,
"object" => participant.event.url
}
end
end

62
lib/service/activity_pub/converter/picture.ex
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defmodule Mobilizon.Service.ActivityPub.Converter.Picture do
@moduledoc """
Picture converter.
This module allows to convert events from ActivityStream format to our own
internal one, and back.
"""
alias Mobilizon.Media.Picture, as: PictureModel
@doc """
Convert a picture struct to an ActivityStream representation.
"""
@spec model_to_as(PictureModel.t()) :: map
def model_to_as(%PictureModel{file: file}) do
%{
"type" => "Document",
"mediaType" => file.content_type,
"url" => file.url,
"name" => file.name
}
end
@doc """
Save picture data from raw data and return AS Link data.
"""
def find_or_create_picture(%{"type" => "Link", "href" => url}, actor_id),
do: find_or_create_picture(url, actor_id)
def find_or_create_picture(
%{"type" => "Document", "url" => picture_url, "name" => name},
actor_id
)
when is_bitstring(picture_url) do
with {:ok, %HTTPoison.Response{body: body}} <- HTTPoison.get(picture_url),
{:ok,
%{
name: name,
url: url,
content_type: content_type,
size: size
}} <-
MobilizonWeb.Upload.store(%{body: body, name: name}),
{:picture_exists, nil} <- {:picture_exists, Mobilizon.Media.get_picture_by_url(url)} do
Mobilizon.Media.create_picture(%{
"file" => %{
"url" => url,
"name" => name,
"content_type" => content_type,
"size" => size
},
"actor_id" => actor_id
})
else
{:picture_exists, %PictureModel{file: _file} = picture} ->
{:ok, picture}
err ->
err
end
end
end

40
lib/service/activity_pub/converter/tombstone.ex
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@@ -1,40 +0,0 @@
defmodule Mobilizon.Service.ActivityPub.Converter.Tombstone do
@moduledoc """
Comment converter.
This module allows to convert Tombstone models to ActivityStreams data
"""
alias Mobilizon.Tombstone, as: TombstoneModel
alias Mobilizon.Service.ActivityPub.{Converter, Convertible}
require Logger
@behaviour Converter
defimpl Convertible, for: TombstoneModel do
alias Mobilizon.Service.ActivityPub.Converter.Tombstone, as: TombstoneConverter
defdelegate model_to_as(comment), to: TombstoneConverter
end
@doc """
Make an AS tombstone object from an existing `Tombstone` structure.
"""
@impl Converter
@spec model_to_as(TombstoneModel.t()) :: map
def model_to_as(%TombstoneModel{} = tombstone) do
%{
"type" => "Tombstone",
"id" => tombstone.uri,
"deleted" => tombstone.inserted_at
}
end
@doc """
Converting an Tombstone to an object makes no sense, nevertheless…
"""
@impl Converter
@spec as_to_model_data(map) :: map
def as_to_model_data(object), do: object
end

112
lib/service/activity_pub/converter/utils.ex
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@@ -1,112 +0,0 @@
defmodule Mobilizon.Service.ActivityPub.Converter.Utils do
@moduledoc """
Various utils for converters
"""
alias Mobilizon.Actors.Actor
alias Mobilizon.Events
alias Mobilizon.Events.Tag
alias Mobilizon.Mention
alias Mobilizon.Service.ActivityPub
alias Mobilizon.Storage.Repo
require Logger
@spec fetch_tags([String.t()]) :: [Tag.t()]
def fetch_tags(tags) when is_list(tags) do
Logger.debug("fetching tags")
Logger.debug(inspect(tags))
tags |> Enum.flat_map(&fetch_tag/1) |> Enum.uniq() |> Enum.map(&existing_tag_or_data/1)
end
@spec fetch_mentions([map()]) :: [map()]
def fetch_mentions(mentions) when is_list(mentions) do
Logger.debug("fetching mentions")
Enum.reduce(mentions, [], fn mention, acc -> create_mention(mention, acc) end)
end
def fetch_address(%{id: id}) do
with {id, ""} <- Integer.parse(id) do
%{id: id}
end
end
def fetch_address(address) when is_map(address) do
address
end
@spec build_tags([Tag.t()]) :: [Map.t()]
def build_tags(tags) do
Enum.map(tags, fn %Tag{} = tag ->
%{
"href" => MobilizonWeb.Endpoint.url() <> "/tags/#{tag.slug}",
"name" => "##{tag.title}",
"type" => "Hashtag"
}
end)
end
def build_mentions(mentions) do
Enum.map(mentions, fn %Mention{} = mention ->
if Ecto.assoc_loaded?(mention.actor) do
build_mention(mention.actor)
else
build_mention(Repo.preload(mention, [:actor]).actor)
end
end)
end
defp build_mention(%Actor{} = actor) do
%{
"href" => actor.url,
"name" => "@#{Mobilizon.Actors.Actor.preferred_username_and_domain(actor)}",
"type" => "Mention"
}
end
defp fetch_tag(%{title: title}), do: [title]
defp fetch_tag(tag) when is_map(tag) do
case tag["type"] do
"Hashtag" ->
[tag_without_hash(tag["name"])]
_err ->
[]
end
end
defp fetch_tag(tag) when is_bitstring(tag), do: [tag_without_hash(tag)]
defp tag_without_hash("#" <> tag_title), do: tag_title
defp tag_without_hash(tag_title), do: tag_title
defp existing_tag_or_data(tag_title) do
case Events.get_tag_by_title(tag_title) do
%Tag{} = tag -> %{title: tag.title, id: tag.id}
nil -> %{title: tag_title}
end
end
@spec create_mention(map(), list()) :: list()
defp create_mention(%Actor{id: actor_id} = _mention, acc) do
acc ++ [%{actor_id: actor_id}]
end
@spec create_mention(map(), list()) :: list()
defp create_mention(mention, acc) when is_map(mention) do
with true <- mention["type"] == "Mention",
{:ok, %Actor{id: actor_id}} <- ActivityPub.get_or_fetch_actor_by_url(mention["href"]) do
acc ++ [%{actor_id: actor_id}]
else
_err ->
acc
end
end
@spec create_mention({String.t(), map()}, list()) :: list()
defp create_mention({_, mention}, acc) when is_map(mention) do
create_mention(mention, acc)
end
end

10
lib/service/activity_pub/convertible.ex
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@@ -1,10 +0,0 @@
defprotocol Mobilizon.Service.ActivityPub.Convertible do
@moduledoc """
Convertible protocol.
"""
@type activity_streams :: map
@spec model_to_as(t) :: activity_streams
def model_to_as(convertible)
end

155
lib/service/activity_pub/relay.ex
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@@ -1,155 +0,0 @@
# Portions of this file are derived from Pleroma:
# Copyright © 2017-2019 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/relay.ex
defmodule Mobilizon.Service.ActivityPub.Relay do
@moduledoc """
Handles following and unfollowing relays and instances.
"""
alias Mobilizon.Actors
alias Mobilizon.Actors.{Actor, Follower}
alias Mobilizon.Service.ActivityPub
alias Mobilizon.Service.ActivityPub.{Activity, Transmogrifier}
alias Mobilizon.Service.WebFinger
alias MobilizonWeb.API.Follows
require Logger
def init() do
# Wait for everything to settle.
Process.sleep(1000 * 5)
get_actor()
end
@spec get_actor() :: Actor.t() | {:error, Ecto.Changeset.t()}
def get_actor do
with {:ok, %Actor{} = actor} <-
Actors.get_or_create_instance_actor_by_url("#{MobilizonWeb.Endpoint.url()}/relay") do
actor
end
end
@spec follow(String.t()) :: {:ok, Activity.t(), Follower.t()}
def follow(address) do
with {:ok, target_instance} <- fetch_actor(address),
%Actor{} = local_actor <- get_actor(),
{:ok, %Actor{} = target_actor} <- ActivityPub.get_or_fetch_actor_by_url(target_instance),
{:ok, activity, follow} <- Follows.follow(local_actor, target_actor) do
Logger.info("Relay: followed instance #{target_instance}; id=#{activity.data["id"]}")
{:ok, activity, follow}
else
e ->
Logger.warn("Error while following remote instance: #{inspect(e)}")
{:error, e}
end
end
@spec unfollow(String.t()) :: {:ok, Activity.t(), Follower.t()}
def unfollow(address) do
with {:ok, target_instance} <- fetch_actor(address),
%Actor{} = local_actor <- get_actor(),
{:ok, %Actor{} = target_actor} <- ActivityPub.get_or_fetch_actor_by_url(target_instance),
{:ok, activity, follow} <- Follows.unfollow(local_actor, target_actor) do
Logger.info("Relay: unfollowed instance #{target_instance}: id=#{activity.data["id"]}")
{:ok, activity, follow}
else
e ->
Logger.warn("Error while unfollowing remote instance: #{inspect(e)}")
{:error, e}
end
end
@spec accept(String.t()) :: {:ok, Activity.t(), Follower.t()}
def accept(address) do
Logger.debug("We're trying to accept a relay subscription")
with {:ok, target_instance} <- fetch_actor(address),
%Actor{} = local_actor <- get_actor(),
{:ok, %Actor{} = target_actor} <- ActivityPub.get_or_fetch_actor_by_url(target_instance),
{:ok, activity, follow} <- Follows.accept(target_actor, local_actor) do
{:ok, activity, follow}
end
end
def reject(address) do
Logger.debug("We're trying to reject a relay subscription")
with {:ok, target_instance} <- fetch_actor(address),
%Actor{} = local_actor <- get_actor(),
{:ok, %Actor{} = target_actor} <- ActivityPub.get_or_fetch_actor_by_url(target_instance),
{:ok, activity, follow} <- Follows.reject(target_actor, local_actor) do
{:ok, activity, follow}
end
end
@doc """
Publish an activity to all relays following this instance
"""
def publish(%Activity{data: %{"object" => object}} = _activity) do
with %Actor{id: actor_id} = actor <- get_actor(),
{object, object_id} <- fetch_object(object),
id <- "#{object_id}/announces/#{actor_id}" do
Logger.info("Publishing activity #{id} to all relays")
ActivityPub.announce(actor, object, id, true, false)
else
e ->
Logger.error("Error while getting local instance actor: #{inspect(e)}")
end
end
def publish(err) do
Logger.error("Tried to publish a bad activity")
Logger.debug(inspect(err))
nil
end
defp fetch_object(object) when is_map(object) do
with {:ok, object} <- Transmogrifier.fetch_obj_helper_as_activity_streams(object) do
{object, object["id"]}
end
end
defp fetch_object(object) when is_bitstring(object), do: {object, object}
@spec fetch_actor(String.t()) :: {:ok, String.t()} | {:error, String.t()}
# Dirty hack
defp fetch_actor("https://" <> address), do: fetch_actor(address)
defp fetch_actor("http://" <> address), do: fetch_actor(address)
defp fetch_actor(address) do
%URI{host: host} = URI.parse("http://" <> address)
cond do
String.contains?(address, "@") ->
check_actor(address)
!is_nil(host) ->
check_actor("relay@#{host}")
true ->
{:error, "Bad URL"}
end
end
@spec check_actor(String.t()) :: {:ok, String.t()} | {:error, String.t()}
defp check_actor(username_and_domain) do
case Actors.get_actor_by_name(username_and_domain) do
%Actor{url: url} -> {:ok, url}
nil -> finger_actor(username_and_domain)
end
end
@spec finger_actor(String.t()) :: {:ok, String.t()} | {:error, String.t()}
defp finger_actor(nickname) do
case WebFinger.finger(nickname) do
{:ok, %{"url" => url}} when not is_nil(url) ->
{:ok, url}
_e ->
{:error, "No ActivityPub URL found in WebFinger"}
end
end
end

565
lib/service/activity_pub/transmogrifier.ex
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@@ -1,565 +0,0 @@
# 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/transmogrifier.ex
defmodule Mobilizon.Service.ActivityPub.Transmogrifier do
@moduledoc """
A module to handle coding from internal to wire ActivityPub and back.
"""
alias Mobilizon.Actors
alias Mobilizon.Actors.{Actor, Follower}
alias Mobilizon.Events
alias Mobilizon.Events.{Comment, Event, Participant}
alias Mobilizon.Service.ActivityPub
alias Mobilizon.Service.ActivityPub.{Activity, Converter, Convertible, Utils}
alias MobilizonWeb.Email.Participation
import Mobilizon.Service.ActivityPub.Utils
require Logger
def handle_incoming(%{"id" => nil}), do: :error
def handle_incoming(%{"id" => ""}), do: :error
def handle_incoming(%{"type" => "Flag"} = data) do
with params <- Converter.Flag.as_to_model(data) do
params = %{
reporter_id: params["reporter"].id,
reported_id: params["reported"].id,
comments_ids: params["comments"] |> Enum.map(& &1.id),
content: params["content"] || "",
additional: %{
"cc" => [params["reported"].url]
},
event_id: if(is_nil(params["event"]), do: nil, else: params["event"].id || nil),
local: false
}
ActivityPub.flag(params, false)
end
end
@doc """
Handles a `Create` activity for `Note` (comments) objects
The following actions are performed
* Fetch the author of the activity
* Convert the ActivityStream data to the comment model format (it also finds and inserts tags)
* Get (by it's URL) or create the comment with this data
* Insert eventual mentions in the database
* Convert the comment back in ActivityStreams data
* Wrap this data back into a `Create` activity
* Return the activity and the comment object
"""
def handle_incoming(%{"type" => "Create", "object" => %{"type" => "Note"} = object}) do
Logger.info("Handle incoming to create notes")
with {:ok, object_data} <-
object |> Converter.Comment.as_to_model_data(),
{:existing_comment, {:error, :comment_not_found}} <-
{:existing_comment, Events.get_comment_from_url_with_preload(object_data.url)},
{:ok, %Activity{} = activity, %Comment{} = comment} <-
ActivityPub.create(:comment, object_data, false) do
{:ok, activity, comment}
else
{:existing_comment, {:ok, %Comment{} = comment}} ->
{:ok, nil, comment}
end
end
@doc """
Handles a `Create` activity for `Event` objects
The following actions are performed
* Fetch the author of the activity
* Convert the ActivityStream data to the event model format (it also finds and inserts tags)
* Get (by it's URL) or create the event with this data
* Insert eventual mentions in the database
* Convert the event back in ActivityStreams data
* Wrap this data back into a `Create` activity
* Return the activity and the event object
"""
def handle_incoming(%{"type" => "Create", "object" => %{"type" => "Event"} = object}) do
Logger.info("Handle incoming to create event")
with {:ok, object_data} <-
object |> Converter.Event.as_to_model_data(),
{:existing_event, nil} <- {:existing_event, Events.get_event_by_url(object_data.url)},
{:ok, %Activity{} = activity, %Event{} = event} <-
ActivityPub.create(:event, object_data, false) do
{:ok, activity, event}
else
{:existing_event, %Event{} = event} -> {:ok, nil, event}
end
end
def handle_incoming(
%{"type" => "Follow", "object" => followed, "actor" => follower, "id" => id} = _data
) do
with {:ok, %Actor{} = followed} <- ActivityPub.get_or_fetch_actor_by_url(followed, true),
{:ok, %Actor{} = follower} <- ActivityPub.get_or_fetch_actor_by_url(follower),
{:ok, activity, object} <- ActivityPub.follow(follower, followed, id, false) do
{:ok, activity, object}
else
e ->
Logger.warn("Unable to handle Follow activity #{inspect(e)}")
:error
end
end
def handle_incoming(
%{
"type" => "Accept",
"object" => accepted_object,
"actor" => _actor,
"id" => id
} = data
) do
with actor_url <- get_actor(data),
{:ok, %Actor{} = actor} <- ActivityPub.get_or_fetch_actor_by_url(actor_url),
{:object_not_found, {:ok, %Activity{} = activity, object}} <-
{:object_not_found,
do_handle_incoming_accept_following(accepted_object, actor) ||
do_handle_incoming_accept_join(accepted_object, actor)} do
{:ok, activity, object}
else
{:object_not_found, nil} ->
Logger.warn(
"Unable to process Accept activity #{inspect(id)}. Object #{inspect(accepted_object)} wasn't found."
)
:error
e ->
Logger.warn(
"Unable to process Accept activity #{inspect(id)} for object #{inspect(accepted_object)} only returned #{
inspect(e)
}"
)
:error
end
end
def handle_incoming(
%{"type" => "Reject", "object" => rejected_object, "actor" => _actor, "id" => id} = data
) do
with actor_url <- get_actor(data),
{:ok, %Actor{} = actor} <- ActivityPub.get_or_fetch_actor_by_url(actor_url),
{:object_not_found, {:ok, activity, object}} <-
{:object_not_found,
do_handle_incoming_reject_following(rejected_object, actor) ||
do_handle_incoming_reject_join(rejected_object, actor)} do
{:ok, activity, object}
else
{:object_not_found, nil} ->
Logger.warn(
"Unable to process Reject activity #{inspect(id)}. Object #{inspect(rejected_object)} wasn't found."
)
:error
e ->
Logger.warn(
"Unable to process Reject activity #{inspect(id)} for object #{inspect(rejected_object)} only returned #{
inspect(e)
}"
)
:error
end
end
def handle_incoming(
%{"type" => "Announce", "object" => object, "actor" => _actor, "id" => _id} = data
) do
with actor <- get_actor(data),
# TODO: Is the following line useful?
{:ok, %Actor{id: actor_id} = _actor} <- ActivityPub.get_or_fetch_actor_by_url(actor),
:ok <- Logger.debug("Fetching contained object"),
{:ok, object} <- fetch_obj_helper_as_activity_streams(object),
:ok <- Logger.debug("Handling contained object"),
create_data <-
make_create_data(object),
:ok <- Logger.debug(inspect(object)),
{:ok, _activity, entity} <- handle_incoming(create_data),
:ok <- Logger.debug("Finished processing contained object"),
{:ok, activity} <- ActivityPub.create_activity(data, false),
{:ok, %Actor{id: object_owner_actor_id}} <- Actors.get_actor_by_url(object["actor"]),
{:ok, %Mobilizon.Share{} = _share} <-
Mobilizon.Share.create(object["id"], actor_id, object_owner_actor_id) do
{:ok, activity, entity}
else
e ->
Logger.debug(inspect(e))
:error
end
end
def handle_incoming(%{
"type" => "Update",
"object" => %{"type" => object_type} = object,
"actor" => _actor_id
})
when object_type in ["Person", "Group", "Application", "Service", "Organization"] do
with {:ok, %Actor{} = old_actor} <- Actors.get_actor_by_url(object["id"]),
{:ok, object_data} <-
object |> Converter.Actor.as_to_model_data(),
{:ok, %Activity{} = activity, %Actor{} = new_actor} <-
ActivityPub.update(:actor, old_actor, object_data, false) do
{:ok, activity, new_actor}
else
e ->
Logger.debug(inspect(e))
:error
end
end
def handle_incoming(
%{"type" => "Update", "object" => %{"type" => "Event"} = object, "actor" => _actor} =
update_data
) do
with actor <- get_actor(update_data),
{:ok, %Actor{url: actor_url}} <- Actors.get_actor_by_url(actor),
{:ok, %Event{} = old_event} <-
object |> Utils.get_url() |> ActivityPub.fetch_object_from_url(),
{:ok, object_data} <-
object |> Converter.Event.as_to_model_data(),
{:origin_check, true} <- {:origin_check, origin_check?(actor_url, update_data)},
{:ok, %Activity{} = activity, %Event{} = new_event} <-
ActivityPub.update(:event, old_event, object_data, false) do
{:ok, activity, new_event}
else
_e ->
:error
end
end
def handle_incoming(
%{
"type" => "Undo",
"object" => %{
"type" => "Announce",
"object" => object_id,
"id" => cancelled_activity_id
},
"actor" => _actor,
"id" => id
} = data
) do
with actor <- get_actor(data),
{:ok, %Actor{} = actor} <- ActivityPub.get_or_fetch_actor_by_url(actor),
{:ok, object} <- fetch_obj_helper_as_activity_streams(object_id),
{:ok, activity, object} <-
ActivityPub.unannounce(actor, object, id, cancelled_activity_id, false) do
{:ok, activity, object}
else
_e -> :error
end
end
def handle_incoming(
%{
"type" => "Undo",
"object" => %{"type" => "Follow", "object" => followed},
"actor" => follower,
"id" => id
} = _data
) do
with {:ok, %Actor{domain: nil} = followed} <- Actors.get_actor_by_url(followed),
{:ok, %Actor{} = follower} <- Actors.get_actor_by_url(follower),
{:ok, activity, object} <- ActivityPub.unfollow(follower, followed, id, false) do
{:ok, activity, object}
else
e ->
Logger.debug(inspect(e))
:error
end
end
# TODO: We presently assume that any actor on the same origin domain as the object being
# deleted has the rights to delete that object. A better way to validate whether or not
# the object should be deleted is to refetch the object URI, which should return either
# an error or a tombstone. This would allow us to verify that a deletion actually took
# place.
def handle_incoming(
%{"type" => "Delete", "object" => object, "actor" => _actor, "id" => _id} = data
) do
with actor <- get_actor(data),
{:ok, %Actor{url: actor_url}} <- Actors.get_actor_by_url(actor),
object_id <- Utils.get_url(object),
{:origin_check, true} <- {:origin_check, origin_check_from_id?(actor_url, object_id)},
{:ok, object} <- ActivityPub.fetch_object_from_url(object_id),
{:ok, activity, object} <- ActivityPub.delete(object, false) do
{:ok, activity, object}
else
{:origin_check, false} ->
Logger.warn("Object origin check failed")
:error
e ->
Logger.debug(inspect(e))
:error
end
end
def handle_incoming(
%{"type" => "Join", "object" => object, "actor" => _actor, "id" => id} = data
) do
with actor <- get_actor(data),
{:ok, %Actor{url: _actor_url} = actor} <- Actors.get_actor_by_url(actor),
object <- Utils.get_url(object),
{:ok, object} <- ActivityPub.fetch_object_from_url(object),
{:ok, activity, object} <- ActivityPub.join(object, actor, false, %{url: id}) do
{:ok, activity, object}
else
e ->
Logger.debug(inspect(e))
:error
end
end
def handle_incoming(
%{"type" => "Leave", "object" => object, "actor" => actor, "id" => _id} = data
) do
with actor <- get_actor(data),
{:ok, %Actor{} = actor} <- Actors.get_actor_by_url(actor),
object <- Utils.get_url(object),
{:ok, object} <- ActivityPub.fetch_object_from_url(object),
{:ok, activity, object} <- ActivityPub.leave(object, actor, false) do
{:ok, activity, object}
else
{:only_organizer, true} ->
Logger.warn(
"Actor #{inspect(actor)} tried to leave event #{inspect(object)} but it was the only organizer so we didn't detach it"
)
:error
_e ->
:error
end
end
#
# # TODO
# # Accept
# # Undo
#
# def handle_incoming(
# %{
# "type" => "Undo",
# "object" => %{"type" => "Like", "object" => object_id},
# "actor" => _actor,
# "id" => id
# } = data
# ) do
# with actor <- get_actor(data),
# %Actor{} = actor <- ActivityPub.get_or_fetch_actor_by_url(actor),
# {:ok, object} <- fetch_obj_helper(object_id) || fetch_obj_helper(object_id),
# {:ok, activity, _, _} <- ActivityPub.unlike(actor, object, id, false) do
# {:ok, activity}
# else
# _e -> :error
# end
# end
def handle_incoming(_) do
Logger.info("Handing something not supported")
{:error, :not_supported}
end
@doc """
Handle incoming `Accept` activities wrapping a `Follow` activity
"""
def do_handle_incoming_accept_following(follow_object, %Actor{} = actor) do
with {:follow, {:ok, %Follower{approved: false, target_actor: followed} = follow}} <-
{:follow, get_follow(follow_object)},
{:same_actor, true} <- {:same_actor, actor.id == followed.id},
{:ok, %Activity{} = activity, %Follower{approved: true} = follow} <-
ActivityPub.accept(
:follow,
follow,
false
) do
{:ok, activity, follow}
else
{:follow, _} ->
Logger.debug(
"Tried to handle an Accept activity but it's not containing a Follow activity"
)
nil
{:same_actor} ->
{:error, "Actor who accepted the follow wasn't the target. Quite odd."}
{:ok, %Follower{approved: true} = _follow} ->
{:error, "Follow already accepted"}
end
end
@doc """
Handle incoming `Reject` activities wrapping a `Follow` activity
"""
def do_handle_incoming_reject_following(follow_object, %Actor{} = actor) do
with {:follow, {:ok, %Follower{approved: false, target_actor: followed} = follow}} <-
{:follow, get_follow(follow_object)},
{:same_actor, true} <- {:same_actor, actor.id == followed.id},
{:ok, activity, _} <-
ActivityPub.reject(:follow, follow) do
{:ok, activity, follow}
else
{:follow, _} ->
Logger.debug(
"Tried to handle a Reject activity but it's not containing a Follow activity"
)
nil
{:same_actor} ->
{:error, "Actor who rejected the follow wasn't the target. Quite odd."}
{:ok, %Follower{approved: true} = _follow} ->
{:error, "Follow already accepted"}
end
end
# Handle incoming `Accept` activities wrapping a `Join` activity on an event
defp do_handle_incoming_accept_join(join_object, %Actor{} = actor_accepting) do
with {:join_event, {:ok, %Participant{role: role, event: event} = participant}}
when role in [:not_approved, :rejected] <-
{:join_event, get_participant(join_object)},
# TODO: The actor that accepts the Join activity may another one that the event organizer ?
# Or maybe for groups it's the group that sends the Accept activity
{:same_actor, true} <- {:same_actor, actor_accepting.id == event.organizer_actor_id},
{:ok, %Activity{} = activity, %Participant{role: :participant} = participant} <-
ActivityPub.accept(
:join,
participant,
false
),
:ok <-
Participation.send_emails_to_local_user(participant) do
{:ok, activity, participant}
else
{:join_event, {:ok, %Participant{role: :participant}}} ->
Logger.debug(
"Tried to handle an Accept activity on a Join activity with a event object but the participant is already validated"
)
nil
{:join_event, _err} ->
Logger.debug(
"Tried to handle an Accept activity but it's not containing a Join activity on a event"
)
nil
{:same_actor} ->
{:error, "Actor who accepted the join wasn't the event organizer. Quite odd."}
{:ok, %Participant{role: :participant} = _follow} ->
{:error, "Participant"}
end
end
# Handle incoming `Reject` activities wrapping a `Join` activity on an event
defp do_handle_incoming_reject_join(join_object, %Actor{} = actor_accepting) do
with {:join_event, {:ok, %Participant{event: event, role: role} = participant}}
when role != :rejected <-
{:join_event, get_participant(join_object)},
# TODO: The actor that accepts the Join activity may another one that the event organizer ?
# Or maybe for groups it's the group that sends the Accept activity
{:same_actor, true} <- {:same_actor, actor_accepting.id == event.organizer_actor_id},
{:ok, activity, participant} <-
ActivityPub.reject(:join, participant, false),
:ok <- Participation.send_emails_to_local_user(participant) do
{:ok, activity, participant}
else
{:join_event, {:ok, %Participant{role: :rejected}}} ->
Logger.warn(
"Tried to handle an Reject activity on a Join activity with a event object but the participant is already rejected"
)
nil
{:join_event, _err} ->
Logger.debug(
"Tried to handle an Reject activity but it's not containing a Join activity on a event"
)
nil
{:same_actor} ->
{:error, "Actor who rejected the join wasn't the event organizer. Quite odd."}
{:ok, %Participant{role: :participant} = _follow} ->
{:error, "Participant"}
end
end
# TODO: Add do_handle_incoming_accept_join/1 on Groups
defp get_follow(follow_object) do
with follow_object_id when not is_nil(follow_object_id) <- Utils.get_url(follow_object),
{:not_found, %Follower{} = follow} <-
{:not_found, Actors.get_follower_by_url(follow_object_id)} do
{:ok, follow}
else
{:not_found, _err} ->
{:error, "Follow URL not found"}
_ ->
{:error, "ActivityPub ID not found in Accept Follow object"}
end
end
defp get_participant(join_object) do
with join_object_id when not is_nil(join_object_id) <- Utils.get_url(join_object),
{:not_found, %Participant{} = participant} <-
{:not_found, Events.get_participant_by_url(join_object_id)} do
{:ok, participant}
else
{:not_found, _err} ->
{:error, "Participant URL not found"}
_ ->
{:error, "ActivityPub ID not found in Accept Join object"}
end
end
def prepare_outgoing(%{"type" => _type} = data) do
data =
data
|> Map.merge(Utils.make_json_ld_header())
{:ok, data}
end
@spec fetch_obj_helper(map() | String.t()) :: Event.t() | Comment.t() | Actor.t() | any()
def fetch_obj_helper(object) do
Logger.debug("fetch_obj_helper")
Logger.debug("Fetching object #{inspect(object)}")
case object |> Utils.get_url() |> ActivityPub.fetch_object_from_url() do
{:ok, object} ->
{:ok, object}
err ->
Logger.warn("Error while fetching #{inspect(object)}")
{:error, err}
end
end
def fetch_obj_helper_as_activity_streams(object) do
Logger.debug("fetch_obj_helper_as_activity_streams")
with {:ok, object} <- fetch_obj_helper(object) do
{:ok, Convertible.model_to_as(object)}
end
end
end

450
lib/service/activity_pub/utils.ex
View File

@@ -1,450 +0,0 @@
# 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 """
# Various ActivityPub related utils.
"""
alias Mobilizon.Actors
alias Mobilizon.Actors.Actor
alias Mobilizon.Media.Picture
alias Mobilizon.Service.ActivityPub.{Activity, Converter}
alias Mobilizon.Service.Federator
require Logger
@actor_types ["Group", "Person", "Application"]
# 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
def make_json_ld_header do
%{
"@context" => [
"https://www.w3.org/ns/activitystreams",
"https://litepub.social/litepub/context.jsonld",
%{
"sc" => "http://schema.org#",
"ical" => "http://www.w3.org/2002/12/cal/ical#",
"pt" => "https://joinpeertube.org/ns#",
"Hashtag" => "as:Hashtag",
"category" => "sc:category",
"uuid" => "sc:identifier",
"maximumAttendeeCapacity" => "sc:maximumAttendeeCapacity",
"location" => %{
"@id" => "sc:location",
"@type" => "sc:Place"
},
"PostalAddress" => "sc:PostalAddress",
"address" => %{
"@id" => "sc:address",
"@type" => "sc:PostalAddress"
},
"addressCountry" => "sc:addressCountry",
"addressRegion" => "sc:addressRegion",
"postalCode" => "sc:postalCode",
"addressLocality" => "sc:addressLocality",
"streetAddress" => "sc:streetAddress",
"mz" => "https://joinmobilizon.org/ns#",
"repliesModerationOptionType" => %{
"@id" => "mz:repliesModerationOptionType",
"@type" => "rdfs:Class"
},
"repliesModerationOption" => %{
"@id" => "mz:repliesModerationOption",
"@type" => "mz:repliesModerationOptionType"
},
"commentsEnabled" => %{
"@type" => "sc:Boolean",
"@id" => "pt:commentsEnabled"
},
"joinModeType" => %{
"@id" => "mz:joinModeType",
"@type" => "rdfs:Class"
},
"joinMode" => %{
"@id" => "mz:joinMode",
"@type" => "mz:joinModeType"
}
}
]
}
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")
if Mobilizon.Config.get!([:instance, :federating]) do
priority =
case activity.data["type"] do
"Delete" -> 10
"Create" -> 1
_ -> 5
end
Federator.enqueue(:publish, activity, priority)
end
: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
def get_actor(%{"actor" => actor}) when is_binary(actor) do
actor
end
def get_actor(%{"actor" => actor}) when is_list(actor) do
if is_binary(Enum.at(actor, 0)) do
Enum.at(actor, 0)
else
actor
|> Enum.find(fn %{"type" => type} -> type in ["Person", "Service", "Application"] end)
|> Map.get("id")
end
end
def get_actor(%{"actor" => %{"id" => id}}) when is_bitstring(id) do
id
end
def get_actor(%{"actor" => nil, "attributedTo" => actor}) when not is_nil(actor) do
get_actor(%{"actor" => actor})
end
@doc """
Checks that an incoming AP object's actor matches the domain it came from.
"""
def origin_check?(id, %{"actor" => actor} = params) when not is_nil(actor) do
id_uri = URI.parse(id)
actor_uri = URI.parse(get_actor(params))
compare_uris?(actor_uri, id_uri)
end
def origin_check?(_id, %{"actor" => nil}), do: false
def origin_check?(id, %{"attributedTo" => actor} = params),
do: origin_check?(id, Map.put(params, "actor", actor))
def origin_check?(_id, _data), do: false
defp compare_uris?(%URI{} = id_uri, %URI{} = other_uri), do: id_uri.host == other_uri.host
def origin_check_from_id?(id, other_id) when is_binary(other_id) do
id_uri = URI.parse(id)
other_uri = URI.parse(other_id)
compare_uris?(id_uri, other_uri)
end
def origin_check_from_id?(id, %{"id" => other_id} = _params) when is_binary(other_id),
do: origin_check_from_id?(id, other_id)
@doc """
Save picture data from %Plug.Upload{} and return AS Link data.
"""
def make_picture_data(%Plug.Upload{} = picture, opts) do
case MobilizonWeb.Upload.store(picture, opts) do
{:ok, picture} ->
picture
_ ->
nil
end
end
@doc """
Convert a picture model into an AS Link representation.
"""
def make_picture_data(%Picture{} = picture) do
Converter.Picture.model_to_as(picture)
end
@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),
{:picture_exists, nil} <- {:picture_exists, Mobilizon.Media.get_picture_by_url(url)},
{:ok, %Picture{file: _file} = picture} <-
Mobilizon.Media.create_picture(%{
"file" => %{
"url" => url,
"name" => picture.name,
"content_type" => content_type,
"size" => size
},
"actor_id" => picture.actor_id
}) do
Converter.Picture.model_to_as(picture)
else
{:picture_exists, %Picture{file: _file} = picture} ->
Converter.Picture.model_to_as(picture)
err ->
err
end
end
def make_picture_data(nil), do: nil
@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 @actor_types 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
) 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(object, additional \\ %{}) do
Logger.debug("Making create data")
Logger.debug(inspect(object))
Logger.debug(inspect(additional))
%{
"type" => "Create",
"to" => object["to"],
"cc" => object["cc"],
"actor" => object["actor"],
"object" => object,
"published" => make_date(),
"id" => object["id"] <> "/activity"
}
|> Map.merge(additional)
end
@doc """
Make update activity data
"""
@spec make_update_data(map(), map()) :: map()
def make_update_data(object, additional \\ %{}) do
Logger.debug("Making update data")
Logger.debug(inspect(object))
Logger.debug(inspect(additional))
%{
"type" => "Update",
"to" => object["to"],
"cc" => object["cc"],
"actor" => object["actor"],
"object" => object,
"id" => object["id"] <> "/activity"
}
|> Map.merge(additional)
end
@doc """
Make accept join activity data
"""
@spec make_accept_join_data(map(), map()) :: map()
def make_accept_join_data(object, additional \\ %{}) do
%{
"type" => "Accept",
"to" => object["to"],
"cc" => object["cc"],
"object" => object,
"id" => object["id"] <> "/activity"
}
|> 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
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
defp make_signature(id, date) do
uri = URI.parse(id)
signature =
Mobilizon.Service.ActivityPub.Relay.get_actor()
|> Mobilizon.Service.HTTPSignatures.Signature.sign(%{
"(request-target)": "get #{uri.path}",
host: uri.host,
date: date
})
[{:Signature, signature}]
end
def sign_fetch(headers, id, date) do
if Mobilizon.Config.get([:activitypub, :sign_object_fetches]) do
headers ++ make_signature(id, date)
else
headers
end
end
def maybe_date_fetch(headers, date) do
if Mobilizon.Config.get([:activitypub, :sign_object_fetches]) do
headers ++ [{:Date, date}]
else
headers
end
end
end

26
lib/service/activity_pub/visibility.ex
View File

@@ -1,26 +0,0 @@
# Portions of this file are derived from Pleroma:
# Copyright © 2017-2019 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/visibility.ex
defmodule Mobilizon.Service.ActivityPub.Visibility do
@moduledoc """
Utility functions related to content visibility
"""
alias Mobilizon.Events.Comment
alias Mobilizon.Service.ActivityPub.Activity
@public "https://www.w3.org/ns/activitystreams#Public"
@spec is_public?(Activity.t() | map()) :: boolean()
def is_public?(%{data: %{"type" => "Tombstone"}}), do: false
def is_public?(%{data: data}), do: is_public?(data)
def is_public?(%Activity{data: data}), do: is_public?(data)
def is_public?(data) when is_map(data),
do: @public in (Map.get(data, "to", []) ++ Map.get(data, "cc", []))
def is_public?(%Comment{deleted_at: deleted_at}), do: !is_nil(deleted_at)
def is_public?(err), do: raise(ArgumentError, message: "Invalid argument #{inspect(err)}")
end

141
lib/service/federator.ex
View File

@@ -1,141 +0,0 @@
# 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/federator/federator.ex
defmodule Mobilizon.Service.Federator do
@moduledoc """
Handle federated activities
"""
use GenServer
alias Mobilizon.Actors
alias Mobilizon.Service.ActivityPub
alias Mobilizon.Service.ActivityPub.{Activity, Transmogrifier}
require Logger
@max_jobs 20
def init(args) do
{:ok, args}
end
def start_link(_) do
spawn(fn ->
# 1 minute
Process.sleep(1000 * 60)
end)
GenServer.start_link(
__MODULE__,
%{
in: {:sets.new(), []},
out: {:sets.new(), []}
},
name: __MODULE__
)
end
def handle(:publish, activity) do
Logger.debug(inspect(activity))
Logger.debug(fn -> "Running publish for #{activity.data["id"]}" end)
with actor when not is_nil(actor) <- Actors.get_actor_by_url!(activity.data["actor"]) do
Logger.info(fn -> "Sending #{activity.data["id"]} out via AP" end)
ActivityPub.publish(actor, activity)
end
end
def handle(:incoming_ap_doc, params) do
Logger.info("Handling incoming AP activity")
Logger.debug(inspect(params))
case Transmogrifier.handle_incoming(params) do
{:ok, activity, _data} ->
{:ok, activity}
%Activity{} ->
Logger.info("Already had #{params["id"]}")
e ->
# Just drop those for now
Logger.error("Unhandled activity")
Logger.debug(inspect(e))
Logger.debug(Jason.encode!(params))
end
end
def handle(:publish_single_ap, params) do
ActivityPub.publish_one(params)
end
def handle(type, _) do
Logger.debug(fn -> "Unknown task: #{type}" end)
{:error, "Don't know what to do with this"}
end
def enqueue(type, payload, priority \\ 1) do
Logger.debug("enqueue something with type #{inspect(type)}")
if Mix.env() == :test do
handle(type, payload)
else
GenServer.cast(__MODULE__, {:enqueue, type, payload, priority})
end
end
def maybe_start_job(running_jobs, queue) do
if :sets.size(running_jobs) < @max_jobs && queue != [] do
{{type, payload}, queue} = queue_pop(queue)
{:ok, pid} = Task.start(fn -> handle(type, payload) end)
mref = Process.monitor(pid)
{:sets.add_element(mref, running_jobs), queue}
else
{running_jobs, queue}
end
end
def handle_cast({:enqueue, type, payload, _priority}, state)
when type in [:incoming_doc, :incoming_ap_doc] do
%{in: {i_running_jobs, i_queue}, out: {o_running_jobs, o_queue}} = state
i_queue = enqueue_sorted(i_queue, {type, payload}, 1)
{i_running_jobs, i_queue} = maybe_start_job(i_running_jobs, i_queue)
{:noreply, %{in: {i_running_jobs, i_queue}, out: {o_running_jobs, o_queue}}}
end
def handle_cast({:enqueue, type, payload, _priority}, state) do
%{in: {i_running_jobs, i_queue}, out: {o_running_jobs, o_queue}} = state
o_queue = enqueue_sorted(o_queue, {type, payload}, 1)
{o_running_jobs, o_queue} = maybe_start_job(o_running_jobs, o_queue)
{:noreply, %{in: {i_running_jobs, i_queue}, out: {o_running_jobs, o_queue}}}
end
def handle_cast(m, state) do
Logger.debug(fn ->
"Unknown: #{inspect(m)}, #{inspect(state)}"
end)
{:noreply, state}
end
def handle_info({:DOWN, ref, :process, _pid, _reason}, state) do
%{in: {i_running_jobs, i_queue}, out: {o_running_jobs, o_queue}} = state
i_running_jobs = :sets.del_element(ref, i_running_jobs)
o_running_jobs = :sets.del_element(ref, o_running_jobs)
{i_running_jobs, i_queue} = maybe_start_job(i_running_jobs, i_queue)
{o_running_jobs, o_queue} = maybe_start_job(o_running_jobs, o_queue)
{:noreply, %{in: {i_running_jobs, i_queue}, out: {o_running_jobs, o_queue}}}
end
def enqueue_sorted(queue, element, priority) do
[%{item: element, priority: priority} | queue]
|> Enum.sort_by(fn %{priority: priority} -> priority end)
end
def queue_pop([%{item: element} | queue]) do
{element, queue}
end
end

14
lib/service/html.ex → lib/service/formatter/default_scrubbler.ex
View File

@@ -3,21 +3,15 @@
# SPDX-License-Identifier: AGPL-3.0-only
# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/html.ex
defmodule Mobilizon.Service.HTML do
defmodule Mobilizon.Service.Formatter.DefaultScrubbler do
@moduledoc """
Service to filter tags out of HTML content
Custom strategy to filter HTML content.
"""
alias HtmlSanitizeEx.Scrubber
alias Mobilizon.Service.HTML.Scrubber.Default
def filter_tags(html), do: Scrubber.scrub(html, Default)
end
defmodule Mobilizon.Service.HTML.Scrubber.Default do
@moduledoc "Custom strategy to filter HTML content"
alias HtmlSanitizeEx.Scrubber.Meta
require HtmlSanitizeEx.Scrubber.Meta
alias HtmlSanitizeEx.Scrubber.Meta
# credo:disable-for-previous-line
# No idea how to fix this one…

8
lib/service/formatter/formatter.ex
View File

@@ -10,18 +10,18 @@ defmodule Mobilizon.Service.Formatter do
alias Mobilizon.Actors
alias Mobilizon.Actors.Actor
alias Mobilizon.Service.HTML
alias Mobilizon.Service.Formatter.HTML
@link_regex ~r"((?:http(s)?:\/\/)?[\w.-]+(?:\.[\w\.-]+)+[\w\-\._~%:/?#[\]@!\$&'\(\)\*\+,;=.]+)|[0-9a-z+\-\.]+:[0-9a-z$-_.+!*'(),]+"ui
@markdown_characters_regex ~r/(`|\*|_|{|}|[|]|\(|\)|#|\+|-|\.|!)/
@auto_linker_config hashtag: true,
hashtag_handler: &Mobilizon.Service.Formatter.hashtag_handler/4,
hashtag_handler: &__MODULE__.hashtag_handler/4,
mention: true,
mention_handler: &Mobilizon.Service.Formatter.mention_handler/4
mention_handler: &__MODULE__.mention_handler/4
def escape_mention_handler("@" <> nickname = mention, buffer, _, _) do
case Mobilizon.Actors.get_actor_by_name(nickname) do
case Actors.get_actor_by_name(nickname) do
%Actor{} ->
# escape markdown characters with `\\`
# (we don't want something like @user__name to be parsed by markdown)

17
lib/service/formatter/html.ex Normal file
View File

@@ -0,0 +1,17 @@
# Portions of this file are derived from Pleroma:
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social>
# SPDX-License-Identifier: AGPL-3.0-only
# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/html.ex
defmodule Mobilizon.Service.Formatter.HTML do
@moduledoc """
Service to filter tags out of HTML content.
"""
alias HtmlSanitizeEx.Scrubber
alias Mobilizon.Service.Formatter.DefaultScrubbler
def filter_tags(html), do: Scrubber.scrub(html, DefaultScrubbler)
end

116
lib/service/http_signatures/signature.ex
View File

@@ -1,116 +0,0 @@
# Portions of this file are derived from Pleroma:
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social>
# SPDX-License-Identifier: AGPL-3.0-only
# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/signature.ex
defmodule Mobilizon.Service.HTTPSignatures.Signature do
@moduledoc """
Adapter for the `HTTPSignatures` lib that handles signing and providing public keys to verify HTTPSignatures
"""
@behaviour HTTPSignatures.Adapter
alias Mobilizon.Actors.Actor
alias Mobilizon.Service.ActivityPub
require Logger
@spec key_id_to_actor_url(String.t()) :: String.t()
def key_id_to_actor_url(key_id) do
%{path: path} =
uri =
key_id
|> URI.parse()
|> Map.put(:fragment, nil)
uri =
if is_nil(path) do
uri
else
Map.put(uri, :path, String.trim_trailing(path, "/publickey"))
end
URI.to_string(uri)
end
@doc """
Convert internal PEM encoded keys to public key format.
"""
@spec prepare_public_key(String.t()) :: {:ok, tuple} | {:error, :pem_decode_error}
def prepare_public_key(public_key_code) do
case :public_key.pem_decode(public_key_code) do
[public_key_entry] ->
{:ok, :public_key.pem_entry_decode(public_key_entry)}
_ ->
{:error, :pem_decode_error}
end
end
# Gets a public key for a given ActivityPub actor ID (url).
@spec get_public_key_for_url(String.t()) ::
{:ok, String.t()} | {:error, :actor_fetch_error | :pem_decode_error}
defp get_public_key_for_url(url) do
with {:ok, %Actor{keys: keys}} <- ActivityPub.get_or_fetch_actor_by_url(url),
{:ok, public_key} <- prepare_public_key(keys) do
{:ok, public_key}
else
{:error, :pem_decode_error} ->
Logger.error("Error while decoding PEM")
{:error, :pem_decode_error}
_ ->
Logger.error("Unable to fetch actor, so no keys for you")
{:error, :actor_fetch_error}
end
end
def fetch_public_key(conn) do
with %{"keyId" => kid} <- HTTPSignatures.signature_for_conn(conn),
actor_id <- key_id_to_actor_url(kid),
:ok <- Logger.debug("Fetching public key for #{actor_id}"),
{:ok, public_key} <- get_public_key_for_url(actor_id) do
{:ok, public_key}
else
e ->
{:error, e}
end
end
def refetch_public_key(conn) do
with %{"keyId" => kid} <- HTTPSignatures.signature_for_conn(conn),
actor_id <- key_id_to_actor_url(kid),
:ok <- Logger.debug("Refetching public key for #{actor_id}"),
{:ok, _actor} <- ActivityPub.make_actor_from_url(actor_id),
{:ok, public_key} <- get_public_key_for_url(actor_id) do
{:ok, public_key}
else
e ->
{:error, e}
end
end
def sign(%Actor{keys: keys} = actor, headers) do
Logger.debug("Signing on behalf of #{actor.url}")
Logger.debug("headers")
Logger.debug(inspect(headers))
with {:ok, key} <- prepare_public_key(keys) do
HTTPSignatures.sign(key, actor.url <> "#main-key", headers)
end
end
def generate_date_header, do: generate_date_header(NaiveDateTime.utc_now())
def generate_date_header(%NaiveDateTime{} = date) do
Timex.format!(date, "{WDshort}, {0D} {Mshort} {YYYY} {h24}:{m}:{s} GMT")
end
def generate_request_target(method, path), do: "#{method} #{path}"
def build_digest(body) do
"SHA-256=" <> (:crypto.hash(:sha256, body) |> Base.encode64())
end
end

20
lib/service/metadata.ex
View File

@@ -1,20 +0,0 @@
defprotocol Mobilizon.Service.Metadata do
@doc """
Build tags
"""
def build_tags(entity)
end
defmodule Mobilizon.Service.MetadataUtils do
@moduledoc """
Tools to convert tags to string
"""
alias Phoenix.HTML
def stringify_tags(tags) do
Enum.reduce(tags, "", &stringify_tag/2)
end
defp stringify_tag(tag, acc) when is_tuple(tag), do: acc <> HTML.safe_to_string(tag)
defp stringify_tag(tag, acc) when is_binary(tag), do: acc <> tag
end

7
lib/service/metadata/metadata.ex Normal file
View File

@@ -0,0 +1,7 @@
defprotocol Mobilizon.Service.Metadata do
@doc """
Build tags
"""
def build_tags(entity)
end

12
lib/service/metadata/utils.ex Normal file
View File

@@ -0,0 +1,12 @@
defmodule Mobilizon.Service.Metadata.Utils do
@moduledoc """
Tools to convert tags to string.
"""
alias Phoenix.HTML
def stringify_tags(tags), do: Enum.reduce(tags, "", &stringify_tag/2)
defp stringify_tag(tag, acc) when is_tuple(tag), do: acc <> HTML.safe_to_string(tag)
defp stringify_tag(tag, acc) when is_binary(tag), do: acc <> tag
end

127
lib/service/web_finger/web_finger.ex
View File

@@ -1,127 +0,0 @@
# 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/web_finger/web_finger.ex
defmodule Mobilizon.Service.WebFinger do
@moduledoc """
# WebFinger
Performs the WebFinger requests and responses (JSON only)
"""
alias Mobilizon.Actors
alias Mobilizon.Actors.Actor
alias Mobilizon.Service.XmlBuilder
require Jason
require Logger
def host_meta do
base_url = MobilizonWeb.Endpoint.url()
{
:XRD,
%{xmlns: "http://docs.oasis-open.org/ns/xri/xrd-1.0"},
{
:Link,
%{
rel: "lrdd",
type: "application/xrd+xml",
template: "#{base_url}/.well-known/webfinger?resource={uri}"
}
}
}
|> XmlBuilder.to_doc()
end
def webfinger(resource, "JSON") do
host = MobilizonWeb.Endpoint.host()
regex = ~r/(acct:)?(?<name>\w+)@#{host}/
with %{"name" => name} <- Regex.named_captures(regex, resource),
%Actor{} = actor <- Actors.get_local_actor_by_name(name) do
{:ok, represent_actor(actor, "JSON")}
else
_e ->
case Actors.get_actor_by_url(resource) do
{:ok, %Actor{} = actor} when not is_nil(actor) ->
{:ok, represent_actor(actor, "JSON")}
_e ->
{:error, "Couldn't find actor"}
end
end
end
@spec represent_actor(Actor.t()) :: struct()
def represent_actor(actor), do: represent_actor(actor, "JSON")
@spec represent_actor(Actor.t(), String.t()) :: struct()
def represent_actor(actor, "JSON") do
%{
"subject" => "acct:#{actor.preferred_username}@#{MobilizonWeb.Endpoint.host()}",
"aliases" => [actor.url],
"links" => [
%{"rel" => "self", "type" => "application/activity+json", "href" => actor.url},
%{
"rel" => "https://webfinger.net/rel/profile-page/",
"type" => "text/html",
"href" => actor.url
}
]
}
end
defp webfinger_from_json(doc) do
data =
Enum.reduce(doc["links"], %{"subject" => doc["subject"]}, fn link, data ->
case {link["type"], link["rel"]} do
{"application/activity+json", "self"} ->
Map.put(data, "url", link["href"])
_ ->
Logger.debug(fn ->
"Unhandled type: #{inspect(link["type"])}"
end)
data
end
end)
{:ok, data}
end
def finger(actor) do
actor = String.trim_leading(actor, "@")
domain =
case String.split(actor, "@") do
[_name, domain] ->
domain
_e ->
URI.parse(actor).host
end
address = "http://#{domain}/.well-known/webfinger?resource=acct:#{actor}"
Logger.debug(inspect(address))
with false <- is_nil(domain),
{:ok, %HTTPoison.Response{} = response} <-
HTTPoison.get(
address,
[Accept: "application/json, application/activity+json, application/jrd+json"],
follow_redirect: true
),
%{status_code: status_code, body: body} when status_code in 200..299 <- response,
{:ok, doc} <- Jason.decode(body) do
webfinger_from_json(doc)
else
e ->
Logger.debug(fn -> "Couldn't finger #{actor}" end)
Logger.debug(fn -> inspect(e) end)
{:error, e}
end
end
end

55
lib/service/xml_builder.ex
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@@ -1,55 +0,0 @@
# 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/xml_builder.ex
defmodule Mobilizon.Service.XmlBuilder do
@moduledoc """
XML Builder.
Needed to build XRD for webfinger host_meta
"""
def to_xml({tag, attributes, content}) do
open_tag = make_open_tag(tag, attributes)
content_xml = to_xml(content)
"<#{open_tag}>#{content_xml}</#{tag}>"
end
def to_xml({tag, %{} = attributes}) do
open_tag = make_open_tag(tag, attributes)
"<#{open_tag} />"
end
def to_xml({tag, content}), do: to_xml({tag, %{}, content})
def to_xml(content) when is_binary(content) do
to_string(content)
end
def to_xml(content) when is_list(content) do
for element <- content do
to_xml(element)
end
|> Enum.join()
end
def to_xml(%NaiveDateTime{} = time) do
NaiveDateTime.to_iso8601(time)
end
def to_doc(content), do: ~s(<?xml version="1.0" encoding="UTF-8"?>) <> to_xml(content)
defp make_open_tag(tag, attributes) do
attributes_string =
for {attribute, value} <- attributes do
"#{attribute}=\"#{value}\""
end
|> Enum.join(" ")
[tag, attributes_string] |> Enum.join(" ") |> String.trim()
end
end