From 045803346d70c1f9c6ea770485904fd7cc52969a Mon Sep 17 00:00:00 2001 From: William Pitcock Date: Wed, 22 May 2019 03:58:15 +0000 Subject: [PATCH 1/2] move key generation functions into Pleroma.Keys module --- lib/pleroma/keys.ex | 44 +++++++++++++++++++ lib/pleroma/signature.ex | 7 ++- lib/pleroma/user.ex | 21 +++++++++ .../activity_pub/activity_pub_controller.ex | 14 +++--- .../web/activity_pub/views/user_view.ex | 11 +++-- lib/pleroma/web/federator/federator.ex | 6 +-- lib/pleroma/web/salmon/salmon.ex | 44 ++----------------- lib/pleroma/web/web_finger/web_finger.ex | 26 +---------- test/keys_test.exs | 20 +++++++++ test/user_test.exs | 15 +++++++ test/web/activity_pub/activity_pub_test.exs | 2 +- .../web/activity_pub/views/user_view_test.exs | 13 +++--- test/web/salmon/salmon_test.exs | 19 ++------ test/web/web_finger/web_finger_test.exs | 15 ------- 14 files changed, 133 insertions(+), 124 deletions(-) create mode 100644 lib/pleroma/keys.ex create mode 100644 test/keys_test.exs diff --git a/lib/pleroma/keys.ex b/lib/pleroma/keys.ex new file mode 100644 index 000000000..b7bc7a4da --- /dev/null +++ b/lib/pleroma/keys.ex @@ -0,0 +1,44 @@ +# Pleroma: A lightweight social networking server +# Copyright © 2017-2019 Pleroma Authors +# SPDX-License-Identifier: AGPL-3.0-only + +defmodule Pleroma.Keys do + # Native generation of RSA keys is only available since OTP 20+ and in default build conditions + # We try at compile time to generate natively an RSA key otherwise we fallback on the old way. + try do + _ = :public_key.generate_key({:rsa, 2048, 65_537}) + + def generate_rsa_pem do + key = :public_key.generate_key({:rsa, 2048, 65_537}) + entry = :public_key.pem_entry_encode(:RSAPrivateKey, key) + pem = :public_key.pem_encode([entry]) |> String.trim_trailing() + {:ok, pem} + end + rescue + _ -> + def generate_rsa_pem do + port = Port.open({:spawn, "openssl genrsa"}, [:binary]) + + {:ok, pem} = + receive do + {^port, {:data, pem}} -> {:ok, pem} + end + + Port.close(port) + + if Regex.match?(~r/RSA PRIVATE KEY/, pem) do + {:ok, pem} + else + :error + end + end + end + + def keys_from_pem(pem) do + [private_key_code] = :public_key.pem_decode(pem) + private_key = :public_key.pem_entry_decode(private_key_code) + {:RSAPrivateKey, _, modulus, exponent, _, _, _, _, _, _, _} = private_key + public_key = {:RSAPublicKey, modulus, exponent} + {:ok, private_key, public_key} + end +end diff --git a/lib/pleroma/signature.ex b/lib/pleroma/signature.ex index b7ecf00a0..1a4d54c62 100644 --- a/lib/pleroma/signature.ex +++ b/lib/pleroma/signature.ex @@ -5,11 +5,10 @@ defmodule Pleroma.Signature do @behaviour HTTPSignatures.Adapter + alias Pleroma.Keys alias Pleroma.User alias Pleroma.Web.ActivityPub.ActivityPub alias Pleroma.Web.ActivityPub.Utils - alias Pleroma.Web.Salmon - alias Pleroma.Web.WebFinger def fetch_public_key(conn) do with actor_id <- Utils.get_ap_id(conn.params["actor"]), @@ -33,8 +32,8 @@ def refetch_public_key(conn) do end def sign(%User{} = user, headers) do - with {:ok, %{info: %{keys: keys}}} <- WebFinger.ensure_keys_present(user), - {:ok, private_key, _} <- Salmon.keys_from_pem(keys) do + with {:ok, %{info: %{keys: keys}}} <- User.ensure_keys_present(user), + {:ok, private_key, _} <- Keys.keys_from_pem(keys) do HTTPSignatures.sign(private_key, user.ap_id <> "#main-key", headers) end end diff --git a/lib/pleroma/user.ex b/lib/pleroma/user.ex index 05fe58f7c..653dec95f 100644 --- a/lib/pleroma/user.ex +++ b/lib/pleroma/user.ex @@ -10,6 +10,7 @@ defmodule Pleroma.User do alias Comeonin.Pbkdf2 alias Pleroma.Activity + alias Pleroma.Keys alias Pleroma.Notification alias Pleroma.Object alias Pleroma.Registration @@ -1422,4 +1423,24 @@ def get_mascot(%{info: %{mascot: mascot}}) when is_nil(mascot) do } } end + + def ensure_keys_present(user) do + info = user.info + + if info.keys do + {:ok, user} + else + {:ok, pem} = Keys.generate_rsa_pem() + + info_cng = + info + |> User.Info.set_keys(pem) + + cng = + Ecto.Changeset.change(user) + |> Ecto.Changeset.put_embed(:info, info_cng) + + update_and_set_cache(cng) + end + end end diff --git a/lib/pleroma/web/activity_pub/activity_pub_controller.ex b/lib/pleroma/web/activity_pub/activity_pub_controller.ex index c967ab7a9..ad2ca1e54 100644 --- a/lib/pleroma/web/activity_pub/activity_pub_controller.ex +++ b/lib/pleroma/web/activity_pub/activity_pub_controller.ex @@ -39,7 +39,7 @@ def relay_active?(conn, _) do def user(conn, %{"nickname" => nickname}) do with %User{} = user <- User.get_cached_by_nickname(nickname), - {:ok, user} <- Pleroma.Web.WebFinger.ensure_keys_present(user) do + {:ok, user} <- User.ensure_keys_present(user) do conn |> put_resp_header("content-type", "application/activity+json") |> json(UserView.render("user.json", %{user: user})) @@ -106,7 +106,7 @@ def activity(conn, %{"uuid" => uuid}) do def following(conn, %{"nickname" => nickname, "page" => page}) do with %User{} = user <- User.get_cached_by_nickname(nickname), - {:ok, user} <- Pleroma.Web.WebFinger.ensure_keys_present(user) do + {:ok, user} <- User.ensure_keys_present(user) do {page, _} = Integer.parse(page) conn @@ -117,7 +117,7 @@ def following(conn, %{"nickname" => nickname, "page" => page}) do def following(conn, %{"nickname" => nickname}) do with %User{} = user <- User.get_cached_by_nickname(nickname), - {:ok, user} <- Pleroma.Web.WebFinger.ensure_keys_present(user) do + {:ok, user} <- User.ensure_keys_present(user) do conn |> put_resp_header("content-type", "application/activity+json") |> json(UserView.render("following.json", %{user: user})) @@ -126,7 +126,7 @@ def following(conn, %{"nickname" => nickname}) do def followers(conn, %{"nickname" => nickname, "page" => page}) do with %User{} = user <- User.get_cached_by_nickname(nickname), - {:ok, user} <- Pleroma.Web.WebFinger.ensure_keys_present(user) do + {:ok, user} <- User.ensure_keys_present(user) do {page, _} = Integer.parse(page) conn @@ -137,7 +137,7 @@ def followers(conn, %{"nickname" => nickname, "page" => page}) do def followers(conn, %{"nickname" => nickname}) do with %User{} = user <- User.get_cached_by_nickname(nickname), - {:ok, user} <- Pleroma.Web.WebFinger.ensure_keys_present(user) do + {:ok, user} <- User.ensure_keys_present(user) do conn |> put_resp_header("content-type", "application/activity+json") |> json(UserView.render("followers.json", %{user: user})) @@ -146,7 +146,7 @@ def followers(conn, %{"nickname" => nickname}) do def outbox(conn, %{"nickname" => nickname} = params) do with %User{} = user <- User.get_cached_by_nickname(nickname), - {:ok, user} <- Pleroma.Web.WebFinger.ensure_keys_present(user) do + {:ok, user} <- User.ensure_keys_present(user) do conn |> put_resp_header("content-type", "application/activity+json") |> json(UserView.render("outbox.json", %{user: user, max_id: params["max_id"]})) @@ -195,7 +195,7 @@ def inbox(conn, params) do def relay(conn, _params) do with %User{} = user <- Relay.get_actor(), - {:ok, user} <- Pleroma.Web.WebFinger.ensure_keys_present(user) do + {:ok, user} <- User.ensure_keys_present(user) do conn |> put_resp_header("content-type", "application/activity+json") |> json(UserView.render("user.json", %{user: user})) diff --git a/lib/pleroma/web/activity_pub/views/user_view.ex b/lib/pleroma/web/activity_pub/views/user_view.ex index 1254fdf6c..327e0e05b 100644 --- a/lib/pleroma/web/activity_pub/views/user_view.ex +++ b/lib/pleroma/web/activity_pub/views/user_view.ex @@ -5,6 +5,7 @@ defmodule Pleroma.Web.ActivityPub.UserView do use Pleroma.Web, :view + alias Pleroma.Keys alias Pleroma.Repo alias Pleroma.User alias Pleroma.Web.ActivityPub.ActivityPub @@ -12,8 +13,6 @@ defmodule Pleroma.Web.ActivityPub.UserView do alias Pleroma.Web.ActivityPub.Utils alias Pleroma.Web.Endpoint alias Pleroma.Web.Router.Helpers - alias Pleroma.Web.Salmon - alias Pleroma.Web.WebFinger import Ecto.Query @@ -34,8 +33,8 @@ def render("endpoints.json", _), do: %{} # the instance itself is not a Person, but instead an Application def render("user.json", %{user: %{nickname: nil} = user}) do - {:ok, user} = WebFinger.ensure_keys_present(user) - {:ok, _, public_key} = Salmon.keys_from_pem(user.info.keys) + {:ok, user} = User.ensure_keys_present(user) + {:ok, _, public_key} = Keys.keys_from_pem(user.info.keys) public_key = :public_key.pem_entry_encode(:SubjectPublicKeyInfo, public_key) public_key = :public_key.pem_encode([public_key]) @@ -62,8 +61,8 @@ def render("user.json", %{user: %{nickname: nil} = user}) do end def render("user.json", %{user: user}) do - {:ok, user} = WebFinger.ensure_keys_present(user) - {:ok, _, public_key} = Salmon.keys_from_pem(user.info.keys) + {:ok, user} = User.ensure_keys_present(user) + {:ok, _, public_key} = Keys.keys_from_pem(user.info.keys) public_key = :public_key.pem_entry_encode(:SubjectPublicKeyInfo, public_key) public_key = :public_key.pem_encode([public_key]) diff --git a/lib/pleroma/web/federator/federator.ex b/lib/pleroma/web/federator/federator.ex index 169fdf4dc..6b0b75284 100644 --- a/lib/pleroma/web/federator/federator.ex +++ b/lib/pleroma/web/federator/federator.ex @@ -11,7 +11,6 @@ defmodule Pleroma.Web.Federator do alias Pleroma.Web.ActivityPub.Utils alias Pleroma.Web.Federator.Publisher alias Pleroma.Web.Federator.RetryQueue - alias Pleroma.Web.WebFinger alias Pleroma.Web.Websub require Logger @@ -77,9 +76,8 @@ def perform(:request_subscription, websub) do def perform(:publish, activity) do Logger.debug(fn -> "Running publish for #{activity.data["id"]}" end) - with actor when not is_nil(actor) <- User.get_cached_by_ap_id(activity.data["actor"]) do - {:ok, actor} = WebFinger.ensure_keys_present(actor) - + with %User{} = actor <- User.get_cached_by_ap_id(activity.data["actor"]), + {:ok, actor} <- User.ensure_keys_present(actor) do Publisher.publish(actor, activity) end end diff --git a/lib/pleroma/web/salmon/salmon.ex b/lib/pleroma/web/salmon/salmon.ex index 42709ab47..fa30f73cd 100644 --- a/lib/pleroma/web/salmon/salmon.ex +++ b/lib/pleroma/web/salmon/salmon.ex @@ -10,6 +10,7 @@ defmodule Pleroma.Web.Salmon do use Bitwise alias Pleroma.Activity + alias Pleroma.Keys alias Pleroma.Instances alias Pleroma.User alias Pleroma.Web.ActivityPub.Visibility @@ -89,45 +90,6 @@ def encode_key({:RSAPublicKey, modulus, exponent}) do "RSA.#{modulus_enc}.#{exponent_enc}" end - # Native generation of RSA keys is only available since OTP 20+ and in default build conditions - # We try at compile time to generate natively an RSA key otherwise we fallback on the old way. - try do - _ = :public_key.generate_key({:rsa, 2048, 65_537}) - - def generate_rsa_pem do - key = :public_key.generate_key({:rsa, 2048, 65_537}) - entry = :public_key.pem_entry_encode(:RSAPrivateKey, key) - pem = :public_key.pem_encode([entry]) |> String.trim_trailing() - {:ok, pem} - end - rescue - _ -> - def generate_rsa_pem do - port = Port.open({:spawn, "openssl genrsa"}, [:binary]) - - {:ok, pem} = - receive do - {^port, {:data, pem}} -> {:ok, pem} - end - - Port.close(port) - - if Regex.match?(~r/RSA PRIVATE KEY/, pem) do - {:ok, pem} - else - :error - end - end - end - - def keys_from_pem(pem) do - [private_key_code] = :public_key.pem_decode(pem) - private_key = :public_key.pem_entry_decode(private_key_code) - {:RSAPrivateKey, _, modulus, exponent, _, _, _, _, _, _, _} = private_key - public_key = {:RSAPublicKey, modulus, exponent} - {:ok, private_key, public_key} - end - def encode(private_key, doc) do type = "application/atom+xml" encoding = "base64url" @@ -227,7 +189,7 @@ def publish(%{info: %{keys: keys}} = user, %{data: %{"type" => type}} = activity |> :xmerl.export_simple(:xmerl_xml) |> to_string - {:ok, private, _} = keys_from_pem(keys) + {:ok, private, _} = Keys.keys_from_pem(keys) {:ok, feed} = encode(private, feed) remote_users = remote_users(activity) @@ -253,7 +215,7 @@ def publish(%{info: %{keys: keys}} = user, %{data: %{"type" => type}} = activity def publish(%{id: id}, _), do: Logger.debug(fn -> "Keys missing for user #{id}" end) def gather_webfinger_links(%User{} = user) do - {:ok, _private, public} = keys_from_pem(user.info.keys) + {:ok, _private, public} = Keys.keys_from_pem(user.info.keys) magic_key = encode_key(public) [ diff --git a/lib/pleroma/web/web_finger/web_finger.ex b/lib/pleroma/web/web_finger/web_finger.ex index 1239b962a..c5b7d4acb 100644 --- a/lib/pleroma/web/web_finger/web_finger.ex +++ b/lib/pleroma/web/web_finger/web_finger.ex @@ -8,7 +8,6 @@ defmodule Pleroma.Web.WebFinger do alias Pleroma.User alias Pleroma.Web alias Pleroma.Web.Federator.Publisher - alias Pleroma.Web.Salmon alias Pleroma.Web.XML alias Pleroma.XmlBuilder require Jason @@ -61,7 +60,7 @@ defp gather_links(%User{} = user) do end def represent_user(user, "JSON") do - {:ok, user} = ensure_keys_present(user) + {:ok, user} = User.ensure_keys_present(user) %{ "subject" => "acct:#{user.nickname}@#{Pleroma.Web.Endpoint.host()}", @@ -71,7 +70,7 @@ def represent_user(user, "JSON") do end def represent_user(user, "XML") do - {:ok, user} = ensure_keys_present(user) + {:ok, user} = User.ensure_keys_present(user) links = gather_links(user) @@ -88,27 +87,6 @@ def represent_user(user, "XML") do |> XmlBuilder.to_doc() end - # This seems a better fit in Salmon - def ensure_keys_present(user) do - info = user.info - - if info.keys do - {:ok, user} - else - {:ok, pem} = Salmon.generate_rsa_pem() - - info_cng = - info - |> User.Info.set_keys(pem) - - cng = - Ecto.Changeset.change(user) - |> Ecto.Changeset.put_embed(:info, info_cng) - - User.update_and_set_cache(cng) - end - end - defp get_magic_key(magic_key) do "data:application/magic-public-key," <> magic_key = magic_key {:ok, magic_key} diff --git a/test/keys_test.exs b/test/keys_test.exs new file mode 100644 index 000000000..776fdea6f --- /dev/null +++ b/test/keys_test.exs @@ -0,0 +1,20 @@ +defmodule Pleroma.KeysTest do + use Pleroma.DataCase + + alias Pleroma.Keys + + test "generates an RSA private key pem" do + {:ok, key} = Keys.generate_rsa_pem() + + assert is_binary(key) + assert Regex.match?(~r/RSA/, key) + end + + test "returns a public and private key from a pem" do + pem = File.read!("test/fixtures/private_key.pem") + {:ok, private, public} = Keys.keys_from_pem(pem) + + assert elem(private, 0) == :RSAPrivateKey + assert elem(public, 0) == :RSAPublicKey + end +end diff --git a/test/user_test.exs b/test/user_test.exs index cb6afbe07..019f2b56d 100644 --- a/test/user_test.exs +++ b/test/user_test.exs @@ -1251,4 +1251,19 @@ test "if user is unconfirmed" do refute user.info.confirmation_token end end + + describe "ensure_keys_present" do + test "it creates keys for a user and stores them in info" do + user = insert(:user) + refute is_binary(user.info.keys) + {:ok, user} = User.ensure_keys_present(user) + assert is_binary(user.info.keys) + end + + test "it doesn't create keys if there already are some" do + user = insert(:user, %{info: %{keys: "xxx"}}) + {:ok, user} = User.ensure_keys_present(user) + assert user.info.keys == "xxx" + end + end end diff --git a/test/web/activity_pub/activity_pub_test.exs b/test/web/activity_pub/activity_pub_test.exs index c18e0ab5f..f743f380b 100644 --- a/test/web/activity_pub/activity_pub_test.exs +++ b/test/web/activity_pub/activity_pub_test.exs @@ -1005,7 +1005,7 @@ test "it filters broken threads" do describe "update" do test "it creates an update activity with the new user data" do user = insert(:user) - {:ok, user} = Pleroma.Web.WebFinger.ensure_keys_present(user) + {:ok, user} = User.ensure_keys_present(user) user_data = Pleroma.Web.ActivityPub.UserView.render("user.json", %{user: user}) {:ok, update} = diff --git a/test/web/activity_pub/views/user_view_test.exs b/test/web/activity_pub/views/user_view_test.exs index 9fb9455d2..e6483db8b 100644 --- a/test/web/activity_pub/views/user_view_test.exs +++ b/test/web/activity_pub/views/user_view_test.exs @@ -2,11 +2,12 @@ defmodule Pleroma.Web.ActivityPub.UserViewTest do use Pleroma.DataCase import Pleroma.Factory + alias Pleroma.User alias Pleroma.Web.ActivityPub.UserView test "Renders a user, including the public key" do user = insert(:user) - {:ok, user} = Pleroma.Web.WebFinger.ensure_keys_present(user) + {:ok, user} = User.ensure_keys_present(user) result = UserView.render("user.json", %{user: user}) @@ -18,7 +19,7 @@ test "Renders a user, including the public key" do test "Does not add an avatar image if the user hasn't set one" do user = insert(:user) - {:ok, user} = Pleroma.Web.WebFinger.ensure_keys_present(user) + {:ok, user} = User.ensure_keys_present(user) result = UserView.render("user.json", %{user: user}) refute result["icon"] @@ -32,7 +33,7 @@ test "Does not add an avatar image if the user hasn't set one" do } ) - {:ok, user} = Pleroma.Web.WebFinger.ensure_keys_present(user) + {:ok, user} = User.ensure_keys_present(user) result = UserView.render("user.json", %{user: user}) assert result["icon"]["url"] == "https://someurl" @@ -42,7 +43,7 @@ test "Does not add an avatar image if the user hasn't set one" do describe "endpoints" do test "local users have a usable endpoints structure" do user = insert(:user) - {:ok, user} = Pleroma.Web.WebFinger.ensure_keys_present(user) + {:ok, user} = User.ensure_keys_present(user) result = UserView.render("user.json", %{user: user}) @@ -58,7 +59,7 @@ test "local users have a usable endpoints structure" do test "remote users have an empty endpoints structure" do user = insert(:user, local: false) - {:ok, user} = Pleroma.Web.WebFinger.ensure_keys_present(user) + {:ok, user} = User.ensure_keys_present(user) result = UserView.render("user.json", %{user: user}) @@ -68,7 +69,7 @@ test "remote users have an empty endpoints structure" do test "instance users do not expose oAuth endpoints" do user = insert(:user, nickname: nil, local: true) - {:ok, user} = Pleroma.Web.WebFinger.ensure_keys_present(user) + {:ok, user} = User.ensure_keys_present(user) result = UserView.render("user.json", %{user: user}) diff --git a/test/web/salmon/salmon_test.exs b/test/web/salmon/salmon_test.exs index 232082779..e86e76fe9 100644 --- a/test/web/salmon/salmon_test.exs +++ b/test/web/salmon/salmon_test.exs @@ -5,6 +5,7 @@ defmodule Pleroma.Web.Salmon.SalmonTest do use Pleroma.DataCase alias Pleroma.Activity + alias Pleroma.Keys alias Pleroma.Repo alias Pleroma.User alias Pleroma.Web.Federator.Publisher @@ -34,12 +35,6 @@ test "errors on wrong magic key" do assert Salmon.decode_and_validate(@wrong_magickey, salmon) == :error end - test "generates an RSA private key pem" do - {:ok, key} = Salmon.generate_rsa_pem() - assert is_binary(key) - assert Regex.match?(~r/RSA/, key) - end - test "it encodes a magic key from a public key" do key = Salmon.decode_key(@magickey) magic_key = Salmon.encode_key(key) @@ -51,18 +46,10 @@ test "it decodes a friendica public key" do _key = Salmon.decode_key(@magickey_friendica) end - test "returns a public and private key from a pem" do - pem = File.read!("test/fixtures/private_key.pem") - {:ok, private, public} = Salmon.keys_from_pem(pem) - - assert elem(private, 0) == :RSAPrivateKey - assert elem(public, 0) == :RSAPublicKey - end - test "encodes an xml payload with a private key" do doc = File.read!("test/fixtures/incoming_note_activity.xml") pem = File.read!("test/fixtures/private_key.pem") - {:ok, private, public} = Salmon.keys_from_pem(pem) + {:ok, private, public} = Keys.keys_from_pem(pem) # Let's try a roundtrip. {:ok, salmon} = Salmon.encode(private, doc) @@ -105,7 +92,7 @@ test "it gets a magic key" do {:ok, activity} = Repo.insert(%Activity{data: activity_data, recipients: activity_data["to"]}) user = User.get_cached_by_ap_id(activity.data["actor"]) - {:ok, user} = Pleroma.Web.WebFinger.ensure_keys_present(user) + {:ok, user} = User.ensure_keys_present(user) Salmon.publish(user, activity) diff --git a/test/web/web_finger/web_finger_test.exs b/test/web/web_finger/web_finger_test.exs index 6b20d8d56..335c95b18 100644 --- a/test/web/web_finger/web_finger_test.exs +++ b/test/web/web_finger/web_finger_test.exs @@ -105,19 +105,4 @@ test "it gets the xrd endpoint for statusnet" do assert template == "http://status.alpicola.com/main/xrd?uri={uri}" end end - - describe "ensure_keys_present" do - test "it creates keys for a user and stores them in info" do - user = insert(:user) - refute is_binary(user.info.keys) - {:ok, user} = WebFinger.ensure_keys_present(user) - assert is_binary(user.info.keys) - end - - test "it doesn't create keys if there already are some" do - user = insert(:user, %{info: %{keys: "xxx"}}) - {:ok, user} = WebFinger.ensure_keys_present(user) - assert user.info.keys == "xxx" - end - end end From 1344c85e2fe636fd6b9d033eb7add1c3a9701c7f Mon Sep 17 00:00:00 2001 From: William Pitcock Date: Wed, 22 May 2019 05:58:51 +0000 Subject: [PATCH 2/2] salmon: fix credo --- lib/pleroma/web/salmon/salmon.ex | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/pleroma/web/salmon/salmon.ex b/lib/pleroma/web/salmon/salmon.ex index fa30f73cd..f25d92fad 100644 --- a/lib/pleroma/web/salmon/salmon.ex +++ b/lib/pleroma/web/salmon/salmon.ex @@ -10,8 +10,8 @@ defmodule Pleroma.Web.Salmon do use Bitwise alias Pleroma.Activity - alias Pleroma.Keys alias Pleroma.Instances + alias Pleroma.Keys alias Pleroma.User alias Pleroma.Web.ActivityPub.Visibility alias Pleroma.Web.Federator.Publisher