# Pleroma: A lightweight social networking server # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/> # SPDX-License-Identifier: AGPL-3.0-only defmodule Pleroma.Web.ActivityPub.ActivityPub do alias Pleroma.{Activity, Repo, Object, Upload, User, Notification} alias Pleroma.Web.ActivityPub.{Transmogrifier, MRF} alias Pleroma.Web.WebFinger alias Pleroma.Web.Federator alias Pleroma.Web.OStatus import Ecto.Query import Pleroma.Web.ActivityPub.Utils require Logger @httpoison Application.get_env(:pleroma, :httpoison) # For Announce activities, we filter the recipients based on following status for any actors # that match actual users. See issue #164 for more information about why this is necessary. defp get_recipients(%{"type" => "Announce"} = data) do to = data["to"] || [] cc = data["cc"] || [] recipients = to ++ cc actor = User.get_cached_by_ap_id(data["actor"]) recipients |> Enum.filter(fn recipient -> case User.get_cached_by_ap_id(recipient) do nil -> true user -> User.following?(user, actor) end end) {recipients, to, cc} end defp get_recipients(%{"type" => "Create"} = data) do to = data["to"] || [] cc = data["cc"] || [] actor = data["actor"] || [] recipients = (to ++ cc ++ [actor]) |> Enum.uniq() {recipients, to, cc} end defp get_recipients(data) do to = data["to"] || [] cc = data["cc"] || [] recipients = to ++ cc {recipients, to, cc} end defp check_actor_is_active(actor) do if not is_nil(actor) do with user <- User.get_cached_by_ap_id(actor), false <- user.info.deactivated do :ok else _e -> :reject end else :ok end end defp check_remote_limit(%{"object" => %{"content" => content}}) when not is_nil(content) do limit = Pleroma.Config.get([:instance, :remote_limit]) String.length(content) <= limit end defp check_remote_limit(_), do: true def insert(map, local \\ true) when is_map(map) do with nil <- Activity.normalize(map), map <- lazy_put_activity_defaults(map), :ok <- check_actor_is_active(map["actor"]), {_, true} <- {:remote_limit_error, check_remote_limit(map)}, {:ok, map} <- MRF.filter(map), :ok <- insert_full_object(map) do {recipients, _, _} = get_recipients(map) {:ok, activity} = Repo.insert(%Activity{ data: map, local: local, actor: map["actor"], recipients: recipients }) Task.start(fn -> Pleroma.Web.RichMedia.Helpers.fetch_data_for_activity(activity) end) Notification.create_notifications(activity) stream_out(activity) {:ok, activity} else %Activity{} = activity -> {:ok, activity} error -> {:error, error} end end def stream_out(activity) do public = "https://www.w3.org/ns/activitystreams#Public" if activity.data["type"] in ["Create", "Announce", "Delete"] do Pleroma.Web.Streamer.stream("user", activity) Pleroma.Web.Streamer.stream("list", activity) if Enum.member?(activity.data["to"], public) do Pleroma.Web.Streamer.stream("public", activity) if activity.local do Pleroma.Web.Streamer.stream("public:local", activity) end if activity.data["type"] in ["Create"] do activity.data["object"] |> Map.get("tag", []) |> Enum.filter(fn tag -> is_bitstring(tag) end) |> Enum.map(fn tag -> Pleroma.Web.Streamer.stream("hashtag:" <> tag, activity) end) if activity.data["object"]["attachment"] != [] do Pleroma.Web.Streamer.stream("public:media", activity) if activity.local do Pleroma.Web.Streamer.stream("public:local:media", activity) end end end else if !Enum.member?(activity.data["cc"] || [], public) && !Enum.member?( activity.data["to"], User.get_by_ap_id(activity.data["actor"]).follower_address ), do: Pleroma.Web.Streamer.stream("direct", activity) end end end def create(%{to: to, actor: actor, context: context, object: object} = params) do additional = params[:additional] || %{} # only accept false as false value local = !(params[:local] == false) published = params[:published] with create_data <- make_create_data( %{to: to, actor: actor, published: published, context: context, object: object}, additional ), {:ok, activity} <- insert(create_data, local), # Changing note count prior to enqueuing federation task in order to avoid race conditions on updating user.info {:ok, _actor} <- User.increase_note_count(actor), :ok <- maybe_federate(activity) do {:ok, activity} end end def accept(%{to: to, actor: actor, object: object} = params) do # only accept false as false value local = !(params[:local] == false) with data <- %{"to" => to, "type" => "Accept", "actor" => actor, "object" => object}, {:ok, activity} <- insert(data, local), :ok <- maybe_federate(activity) do {:ok, activity} end end def reject(%{to: to, actor: actor, object: object} = params) do # only accept false as false value local = !(params[:local] == false) with data <- %{"to" => to, "type" => "Reject", "actor" => actor, "object" => object}, {:ok, activity} <- insert(data, local), :ok <- maybe_federate(activity) do {:ok, activity} end end def update(%{to: to, cc: cc, actor: actor, object: object} = params) do # only accept false as false value local = !(params[:local] == false) with data <- %{ "to" => to, "cc" => cc, "type" => "Update", "actor" => actor, "object" => object }, {:ok, activity} <- insert(data, local), :ok <- maybe_federate(activity) do {:ok, activity} end end # TODO: This is weird, maybe we shouldn't check here if we can make the activity. def like( %User{ap_id: ap_id} = user, %Object{data: %{"id" => _}} = object, activity_id \\ nil, local \\ true ) do with nil <- get_existing_like(ap_id, object), like_data <- make_like_data(user, object, activity_id), {:ok, activity} <- insert(like_data, local), {:ok, object} <- add_like_to_object(activity, object), :ok <- maybe_federate(activity) do {:ok, activity, object} else %Activity{} = activity -> {:ok, activity, object} error -> {:error, error} end end def unlike( %User{} = actor, %Object{} = object, activity_id \\ nil, local \\ true ) do with %Activity{} = like_activity <- get_existing_like(actor.ap_id, object), unlike_data <- make_unlike_data(actor, like_activity, activity_id), {:ok, unlike_activity} <- insert(unlike_data, local), {:ok, _activity} <- Repo.delete(like_activity), {:ok, object} <- remove_like_from_object(like_activity, object), :ok <- maybe_federate(unlike_activity) do {:ok, unlike_activity, like_activity, object} else _e -> {:ok, object} end end def announce( %User{ap_id: _} = user, %Object{data: %{"id" => _}} = object, activity_id \\ nil, local \\ true, public \\ true ) do with true <- is_public?(object), announce_data <- make_announce_data(user, object, activity_id, public), {:ok, activity} <- insert(announce_data, local), {:ok, object} <- add_announce_to_object(activity, object), :ok <- maybe_federate(activity) do {:ok, activity, object} else error -> {:error, error} end end def unannounce( %User{} = actor, %Object{} = object, activity_id \\ nil, local \\ true ) do with %Activity{} = announce_activity <- get_existing_announce(actor.ap_id, object), unannounce_data <- make_unannounce_data(actor, announce_activity, activity_id), {:ok, unannounce_activity} <- insert(unannounce_data, local), :ok <- maybe_federate(unannounce_activity), {:ok, _activity} <- Repo.delete(announce_activity), {:ok, object} <- remove_announce_from_object(announce_activity, object) do {:ok, unannounce_activity, object} else _e -> {:ok, object} end end def follow(follower, followed, activity_id \\ nil, local \\ true) do with data <- make_follow_data(follower, followed, activity_id), {:ok, activity} <- insert(data, local), :ok <- maybe_federate(activity) do {:ok, activity} end end def unfollow(follower, followed, activity_id \\ nil, local \\ true) do with %Activity{} = follow_activity <- fetch_latest_follow(follower, followed), {:ok, follow_activity} <- update_follow_state(follow_activity, "cancelled"), unfollow_data <- make_unfollow_data(follower, followed, follow_activity, activity_id), {:ok, activity} <- insert(unfollow_data, local), :ok <- maybe_federate(activity) do {:ok, activity} end end def delete(%Object{data: %{"id" => id, "actor" => actor}} = object, local \\ true) do user = User.get_cached_by_ap_id(actor) data = %{ "type" => "Delete", "actor" => actor, "object" => id, "to" => [user.follower_address, "https://www.w3.org/ns/activitystreams#Public"] } with {:ok, _} <- Object.delete(object), {:ok, activity} <- insert(data, local), # Changing note count prior to enqueuing federation task in order to avoid race conditions on updating user.info {:ok, _actor} <- User.decrease_note_count(user), :ok <- maybe_federate(activity) do {:ok, activity} end end def block(blocker, blocked, activity_id \\ nil, local \\ true) do ap_config = Application.get_env(:pleroma, :activitypub) unfollow_blocked = Keyword.get(ap_config, :unfollow_blocked) outgoing_blocks = Keyword.get(ap_config, :outgoing_blocks) with true <- unfollow_blocked do follow_activity = fetch_latest_follow(blocker, blocked) if follow_activity do unfollow(blocker, blocked, nil, local) end end with true <- outgoing_blocks, block_data <- make_block_data(blocker, blocked, activity_id), {:ok, activity} <- insert(block_data, local), :ok <- maybe_federate(activity) do {:ok, activity} else _e -> {:ok, nil} end end def unblock(blocker, blocked, activity_id \\ nil, local \\ true) do with %Activity{} = block_activity <- fetch_latest_block(blocker, blocked), unblock_data <- make_unblock_data(blocker, blocked, block_activity, activity_id), {:ok, activity} <- insert(unblock_data, local), :ok <- maybe_federate(activity) do {:ok, activity} end end def fetch_activities_for_context(context, opts \\ %{}) do public = ["https://www.w3.org/ns/activitystreams#Public"] recipients = if opts["user"], do: [opts["user"].ap_id | opts["user"].following] ++ public, else: public query = from(activity in Activity) query = query |> restrict_blocked(opts) |> restrict_recipients(recipients, opts["user"]) query = from( activity in query, where: fragment( "?->>'type' = ? and ?->>'context' = ?", activity.data, "Create", activity.data, ^context ), order_by: [desc: :id] ) Repo.all(query) end def fetch_public_activities(opts \\ %{}) do q = fetch_activities_query(["https://www.w3.org/ns/activitystreams#Public"], opts) q |> restrict_unlisted() |> Repo.all() |> Enum.reverse() end @valid_visibilities ~w[direct unlisted public private] defp restrict_visibility(query, %{visibility: visibility}) when visibility in @valid_visibilities do query = from( a in query, where: fragment("activity_visibility(?, ?, ?) = ?", a.actor, a.recipients, a.data, ^visibility) ) Ecto.Adapters.SQL.to_sql(:all, Repo, query) query end defp restrict_visibility(_query, %{visibility: visibility}) when visibility not in @valid_visibilities do Logger.error("Could not restrict visibility to #{visibility}") end defp restrict_visibility(query, _visibility), do: query def fetch_user_activities(user, reading_user, params \\ %{}) do params = params |> Map.put("type", ["Create", "Announce"]) |> Map.put("actor_id", user.ap_id) |> Map.put("whole_db", true) |> Map.put("pinned_activity_ids", user.info.pinned_activities) recipients = if reading_user do ["https://www.w3.org/ns/activitystreams#Public"] ++ [reading_user.ap_id | reading_user.following] else ["https://www.w3.org/ns/activitystreams#Public"] end fetch_activities(recipients, params) |> Enum.reverse() end defp restrict_since(query, %{"since_id" => ""}), do: query defp restrict_since(query, %{"since_id" => since_id}) do from(activity in query, where: activity.id > ^since_id) end defp restrict_since(query, _), do: query defp restrict_tag_reject(query, %{"tag_reject" => tag_reject}) when is_list(tag_reject) and tag_reject != [] do from( activity in query, where: fragment("(not (? #> '{\"object\",\"tag\"}') \\?| ?)", activity.data, ^tag_reject) ) end defp restrict_tag_reject(query, _), do: query defp restrict_tag_all(query, %{"tag_all" => tag_all}) when is_list(tag_all) and tag_all != [] do from( activity in query, where: fragment("(? #> '{\"object\",\"tag\"}') \\?& ?", activity.data, ^tag_all) ) end defp restrict_tag_all(query, _), do: query defp restrict_tag(query, %{"tag" => tag}) when is_list(tag) do from( activity in query, where: fragment("(? #> '{\"object\",\"tag\"}') \\?| ?", activity.data, ^tag) ) end defp restrict_tag(query, %{"tag" => tag}) when is_binary(tag) do from( activity in query, where: fragment("? <@ (? #> '{\"object\",\"tag\"}')", ^tag, activity.data) ) end defp restrict_tag(query, _), do: query defp restrict_to_cc(query, recipients_to, recipients_cc) do from( activity in query, where: fragment( "(?->'to' \\?| ?) or (?->'cc' \\?| ?)", activity.data, ^recipients_to, activity.data, ^recipients_cc ) ) end defp restrict_recipients(query, [], _user), do: query defp restrict_recipients(query, recipients, nil) do from(activity in query, where: fragment("? && ?", ^recipients, activity.recipients)) end defp restrict_recipients(query, recipients, user) do from( activity in query, where: fragment("? && ?", ^recipients, activity.recipients), or_where: activity.actor == ^user.ap_id ) end defp restrict_limit(query, %{"limit" => limit}) do from(activity in query, limit: ^limit) end defp restrict_limit(query, _), do: query defp restrict_local(query, %{"local_only" => true}) do from(activity in query, where: activity.local == true) end defp restrict_local(query, _), do: query defp restrict_max(query, %{"max_id" => ""}), do: query defp restrict_max(query, %{"max_id" => max_id}) do from(activity in query, where: activity.id < ^max_id) end defp restrict_max(query, _), do: query defp restrict_actor(query, %{"actor_id" => actor_id}) do from(activity in query, where: activity.actor == ^actor_id) end defp restrict_actor(query, _), do: query defp restrict_type(query, %{"type" => type}) when is_binary(type) do restrict_type(query, %{"type" => [type]}) end defp restrict_type(query, %{"type" => type}) do from(activity in query, where: fragment("?->>'type' = ANY(?)", activity.data, ^type)) end defp restrict_type(query, _), do: query defp restrict_favorited_by(query, %{"favorited_by" => ap_id}) do from( activity in query, where: fragment("? <@ (? #> '{\"object\",\"likes\"}')", ^ap_id, activity.data) ) end defp restrict_favorited_by(query, _), do: query defp restrict_media(query, %{"only_media" => val}) when val == "true" or val == "1" do from( activity in query, where: fragment("not (? #> '{\"object\",\"attachment\"}' = ?)", activity.data, ^[]) ) end defp restrict_media(query, _), do: query defp restrict_replies(query, %{"exclude_replies" => val}) when val == "true" or val == "1" do from( activity in query, where: fragment("?->'object'->>'inReplyTo' is null", activity.data) ) end defp restrict_replies(query, _), do: query defp restrict_reblogs(query, %{"exclude_reblogs" => val}) when val == "true" or val == "1" do from(activity in query, where: fragment("?->>'type' != 'Announce'", activity.data)) end defp restrict_reblogs(query, _), do: query defp restrict_blocked(query, %{"blocking_user" => %User{info: info}}) do blocks = info.blocks || [] domain_blocks = info.domain_blocks || [] from( activity in query, where: fragment("not (? = ANY(?))", activity.actor, ^blocks), where: fragment("not (?->'to' \\?| ?)", activity.data, ^blocks), where: fragment("not (split_part(?, '/', 3) = ANY(?))", activity.actor, ^domain_blocks) ) end defp restrict_blocked(query, _), do: query defp restrict_unlisted(query) do from( activity in query, where: fragment( "not (coalesce(?->'cc', '{}'::jsonb) \\?| ?)", activity.data, ^["https://www.w3.org/ns/activitystreams#Public"] ) ) end defp restrict_pinned(query, %{"pinned" => "true", "pinned_activity_ids" => ids}) do from(activity in query, where: activity.id in ^ids) end defp restrict_pinned(query, _), do: query def fetch_activities_query(recipients, opts \\ %{}) do base_query = from( activity in Activity, limit: 20, order_by: [fragment("? desc nulls last", activity.id)] ) base_query |> restrict_recipients(recipients, opts["user"]) |> restrict_tag(opts) |> restrict_tag_reject(opts) |> restrict_tag_all(opts) |> restrict_since(opts) |> restrict_local(opts) |> restrict_limit(opts) |> restrict_max(opts) |> restrict_actor(opts) |> restrict_type(opts) |> restrict_favorited_by(opts) |> restrict_blocked(opts) |> restrict_media(opts) |> restrict_visibility(opts) |> restrict_replies(opts) |> restrict_reblogs(opts) |> restrict_pinned(opts) end def fetch_activities(recipients, opts \\ %{}) do fetch_activities_query(recipients, opts) |> Repo.all() |> Enum.reverse() end def fetch_activities_bounded(recipients_to, recipients_cc, opts \\ %{}) do fetch_activities_query([], opts) |> restrict_to_cc(recipients_to, recipients_cc) |> Repo.all() |> Enum.reverse() end def upload(file, opts \\ []) do with {:ok, data} <- Upload.store(file, opts) do obj_data = if opts[:actor] do Map.put(data, "actor", opts[:actor]) else data end Repo.insert(%Object{data: obj_data}) end end def user_data_from_user_object(data) do avatar = data["icon"]["url"] && %{ "type" => "Image", "url" => [%{"href" => data["icon"]["url"]}] } banner = data["image"]["url"] && %{ "type" => "Image", "url" => [%{"href" => data["image"]["url"]}] } locked = data["manuallyApprovesFollowers"] || false data = Transmogrifier.maybe_fix_user_object(data) user_data = %{ ap_id: data["id"], info: %{ "ap_enabled" => true, "source_data" => data, "banner" => banner, "locked" => locked }, avatar: avatar, name: data["name"], follower_address: data["followers"], bio: data["summary"] } # nickname can be nil because of virtual actors user_data = if data["preferredUsername"] do Map.put( user_data, :nickname, "#{data["preferredUsername"]}@#{URI.parse(data["id"]).host}" ) else Map.put(user_data, :nickname, nil) end {:ok, user_data} end def fetch_and_prepare_user_from_ap_id(ap_id) do with {:ok, data} <- fetch_and_contain_remote_object_from_id(ap_id) do user_data_from_user_object(data) else e -> Logger.error("Could not decode user at fetch #{ap_id}, #{inspect(e)}") end end def make_user_from_ap_id(ap_id) do if _user = User.get_by_ap_id(ap_id) do Transmogrifier.upgrade_user_from_ap_id(ap_id) else with {:ok, data} <- fetch_and_prepare_user_from_ap_id(ap_id) do User.insert_or_update_user(data) else e -> {:error, e} end end end def make_user_from_nickname(nickname) do with {:ok, %{"ap_id" => ap_id}} when not is_nil(ap_id) <- WebFinger.finger(nickname) do make_user_from_ap_id(ap_id) else _e -> {:error, "No AP id in WebFinger"} end end def should_federate?(inbox, public) do if public do true else inbox_info = URI.parse(inbox) !Enum.member?(Pleroma.Config.get([:instance, :quarantined_instances], []), inbox_info.host) end end def publish(actor, activity) do followers = if actor.follower_address in activity.recipients do {:ok, followers} = User.get_followers(actor) followers |> Enum.filter(&(!&1.local)) else [] end public = is_public?(activity) remote_inboxes = (Pleroma.Web.Salmon.remote_users(activity) ++ followers) |> Enum.filter(fn user -> User.ap_enabled?(user) end) |> Enum.map(fn %{info: %{source_data: data}} -> (is_map(data["endpoints"]) && Map.get(data["endpoints"], "sharedInbox")) || data["inbox"] end) |> Enum.uniq() |> Enum.filter(fn inbox -> should_federate?(inbox, public) end) {:ok, data} = Transmogrifier.prepare_outgoing(activity.data) json = Jason.encode!(data) Enum.each(remote_inboxes, fn inbox -> Federator.enqueue(:publish_single_ap, %{ inbox: inbox, json: json, actor: actor, id: activity.data["id"] }) end) end def publish_one(%{inbox: inbox, json: json, actor: actor, id: id}) do Logger.info("Federating #{id} to #{inbox}") host = URI.parse(inbox).host digest = "SHA-256=" <> (:crypto.hash(:sha256, json) |> Base.encode64()) signature = Pleroma.Web.HTTPSignatures.sign(actor, %{ host: host, "content-length": byte_size(json), digest: digest }) @httpoison.post( inbox, json, [ {"Content-Type", "application/activity+json"}, {"signature", signature}, {"digest", digest} ] ) end # TODO: # This will create a Create activity, which we need internally at the moment. def fetch_object_from_id(id) do if object = Object.get_cached_by_ap_id(id) do {:ok, object} else Logger.info("Fetching #{id} via AP") with {:ok, data} <- fetch_and_contain_remote_object_from_id(id), nil <- Object.normalize(data), params <- %{ "type" => "Create", "to" => data["to"], "cc" => data["cc"], "actor" => data["actor"] || data["attributedTo"], "object" => data }, :ok <- Transmogrifier.contain_origin(id, params), {:ok, activity} <- Transmogrifier.handle_incoming(params) do {:ok, Object.normalize(activity.data["object"])} else {:error, {:reject, nil}} -> {:reject, nil} object = %Object{} -> {:ok, object} _e -> Logger.info("Couldn't get object via AP, trying out OStatus fetching...") case OStatus.fetch_activity_from_url(id) do {:ok, [activity | _]} -> {:ok, Object.normalize(activity.data["object"])} e -> e end end end end def fetch_and_contain_remote_object_from_id(id) do Logger.info("Fetching #{id} via AP") with true <- String.starts_with?(id, "http"), {:ok, %{body: body, status: code}} when code in 200..299 <- @httpoison.get( id, [{:Accept, "application/activity+json"}] ), {:ok, data} <- Jason.decode(body), :ok <- Transmogrifier.contain_origin_from_id(id, data) do {:ok, data} else e -> {:error, e} end end def is_public?(%Object{data: %{"type" => "Tombstone"}}), do: false def is_public?(%Object{data: data}), do: is_public?(data) def is_public?(%Activity{data: data}), do: is_public?(data) def is_public?(%{"directMessage" => true}), do: false def is_public?(data) do "https://www.w3.org/ns/activitystreams#Public" in (data["to"] ++ (data["cc"] || [])) end def is_private?(activity) do !is_public?(activity) && Enum.any?(activity.data["to"], &String.contains?(&1, "/followers")) end def is_direct?(%Activity{data: %{"directMessage" => true}}), do: true def is_direct?(%Object{data: %{"directMessage" => true}}), do: true def is_direct?(activity) do !is_public?(activity) && !is_private?(activity) end def visible_for_user?(activity, nil) do is_public?(activity) end def visible_for_user?(activity, user) do x = [user.ap_id | user.following] y = activity.data["to"] ++ (activity.data["cc"] || []) visible_for_user?(activity, nil) || Enum.any?(x, &(&1 in y)) end # guard def entire_thread_visible_for_user?(nil, _user), do: false # child def entire_thread_visible_for_user?( %Activity{data: %{"object" => %{"inReplyTo" => parent_id}}} = tail, user ) when is_binary(parent_id) do parent = Activity.get_in_reply_to_activity(tail) visible_for_user?(tail, user) && entire_thread_visible_for_user?(parent, user) end # root def entire_thread_visible_for_user?(tail, user), do: visible_for_user?(tail, user) # filter out broken threads def contain_broken_threads(%Activity{} = activity, %User{} = user) do entire_thread_visible_for_user?(activity, user) end # do post-processing on a specific activity def contain_activity(%Activity{} = activity, %User{} = user) do contain_broken_threads(activity, user) end # do post-processing on a timeline def contain_timeline(timeline, user) do timeline |> Enum.filter(fn activity -> contain_activity(activity, user) end) end end