mobilizon/lib/federation/activity_pub/utils.ex

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# Portions of this file are derived from Pleroma:
# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social>
# SPDX-License-Identifier: AGPL-3.0-only
# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/web/activity_pub/utils.ex
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defmodule Mobilizon.Federation.ActivityPub.Utils do
@moduledoc """
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Various ActivityPub related utils.
"""
alias Mobilizon.Actors
alias Mobilizon.Actors.Actor
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alias Mobilizon.Media.Picture
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alias Mobilizon.Federation.ActivityPub.{Activity, Federator, Relay}
alias Mobilizon.Federation.ActivityStream.Converter
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alias Mobilizon.Federation.HTTPSignatures
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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
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def make_json_ld_header do
%{
"@context" => [
"https://www.w3.org/ns/activitystreams",
"https://litepub.social/litepub/context.jsonld",
%{
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"sc" => "http://schema.org#",
"ical" => "http://www.w3.org/2002/12/cal/ical#",
"pt" => "https://joinpeertube.org/ns#",
"Hashtag" => "as:Hashtag",
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"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
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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
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:ok
end
def maybe_federate(_), do: :ok
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def remote_actors(%{data: %{"to" => to} = data}) do
to = to ++ (data["cc"] || [])
to
|> Enum.map(fn url -> Actors.get_actor_by_url(url) end)
|> Enum.map(fn {status, actor} ->
case status do
:ok ->
actor
_ ->
nil
end
end)
|> Enum.map(& &1)
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|> Enum.filter(fn actor -> actor && !is_nil(actor.domain) end)
end
@doc """
Adds an id and a published data if they aren't there,
also adds it to an included object
"""
def lazy_put_activity_defaults(map) do
if is_map(map["object"]) do
object = lazy_put_object_defaults(map["object"])
%{map | "object" => object}
else
map
end
end
@doc """
Adds an id and published date if they aren't there.
"""
def lazy_put_object_defaults(map) do
Map.put_new_lazy(map, "published", &make_date/0)
end
def get_actor(%{"actor" => actor}) when is_binary(actor) do
actor
end
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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)
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@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
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@doc """
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Convert a picture model into an AS Link representation.
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"""
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def make_picture_data(%Picture{} = picture) do
Converter.Picture.model_to_as(picture)
end
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@doc """
Save picture data from raw data and return AS Link data.
"""
def make_picture_data(picture) when is_map(picture) do
with {:ok, %{"url" => [%{"href" => url, "mediaType" => content_type}], "size" => size}} <-
MobilizonWeb.Upload.store(picture.file),
{:picture_exists, nil} <- {:picture_exists, Mobilizon.Media.get_picture_by_url(url)},
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{:ok, %Picture{file: _file} = picture} <-
Mobilizon.Media.create_picture(%{
"file" => %{
"url" => url,
"name" => picture.name,
"content_type" => content_type,
"size" => size
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},
"actor_id" => picture.actor_id
}) do
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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 =
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Relay.get_actor()
|> 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