819 lines
22 KiB
Elixir
819 lines
22 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.ActivityPub.Utils do
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alias Ecto.Changeset
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alias Ecto.UUID
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alias Pleroma.Activity
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alias Pleroma.Notification
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alias Pleroma.Object
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alias Pleroma.Repo
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alias Pleroma.User
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alias Pleroma.Web
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alias Pleroma.Web.ActivityPub.Visibility
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alias Pleroma.Web.Endpoint
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alias Pleroma.Web.Router.Helpers
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import Ecto.Query
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require Logger
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require Pleroma.Constants
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@supported_object_types ["Article", "Note", "Video", "Page", "Question", "Answer"]
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@supported_report_states ~w(open closed resolved)
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@valid_visibilities ~w(public unlisted private direct)
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# Some implementations send the actor URI as the actor field, others send the entire actor object,
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# so figure out what the actor's URI is based on what we have.
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def get_ap_id(%{"id" => id} = _), do: id
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def get_ap_id(id), do: id
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def normalize_params(params) do
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Map.put(params, "actor", get_ap_id(params["actor"]))
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end
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def determine_explicit_mentions(%{"tag" => tag} = _object) when is_list(tag) do
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tag
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|> Enum.filter(fn x -> is_map(x) end)
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|> Enum.filter(fn x -> x["type"] == "Mention" end)
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|> Enum.map(fn x -> x["href"] end)
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end
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def determine_explicit_mentions(%{"tag" => tag} = object) when is_map(tag) do
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Map.put(object, "tag", [tag])
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|> determine_explicit_mentions()
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end
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def determine_explicit_mentions(_), do: []
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defp recipient_in_collection(ap_id, coll) when is_binary(coll), do: ap_id == coll
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defp recipient_in_collection(ap_id, coll) when is_list(coll), do: ap_id in coll
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defp recipient_in_collection(_, _), do: false
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def recipient_in_message(%User{ap_id: ap_id} = recipient, %User{} = actor, params) do
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cond do
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recipient_in_collection(ap_id, params["to"]) ->
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true
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recipient_in_collection(ap_id, params["cc"]) ->
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true
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recipient_in_collection(ap_id, params["bto"]) ->
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true
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recipient_in_collection(ap_id, params["bcc"]) ->
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true
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# if the message is unaddressed at all, then assume it is directly addressed
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# to the recipient
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!params["to"] && !params["cc"] && !params["bto"] && !params["bcc"] ->
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true
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# if the message is sent from somebody the user is following, then assume it
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# is addressed to the recipient
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User.following?(recipient, actor) ->
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true
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true ->
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false
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end
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end
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defp extract_list(target) when is_binary(target), do: [target]
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defp extract_list(lst) when is_list(lst), do: lst
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defp extract_list(_), do: []
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def maybe_splice_recipient(ap_id, params) do
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need_splice =
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!recipient_in_collection(ap_id, params["to"]) &&
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!recipient_in_collection(ap_id, params["cc"])
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cc_list = extract_list(params["cc"])
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if need_splice do
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params
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|> Map.put("cc", [ap_id | cc_list])
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else
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params
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end
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end
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def make_json_ld_header do
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%{
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"@context" => [
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"https://www.w3.org/ns/activitystreams",
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"#{Web.base_url()}/schemas/litepub-0.1.jsonld",
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%{
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"@language" => "und"
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}
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]
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}
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end
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def make_date do
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DateTime.utc_now() |> DateTime.to_iso8601()
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end
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def generate_activity_id do
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generate_id("activities")
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end
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def generate_context_id do
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generate_id("contexts")
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end
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def generate_object_id do
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Helpers.o_status_url(Endpoint, :object, UUID.generate())
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end
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def generate_id(type) do
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"#{Web.base_url()}/#{type}/#{UUID.generate()}"
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end
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def get_notified_from_object(%{"type" => type} = object) when type in @supported_object_types do
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fake_create_activity = %{
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"to" => object["to"],
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"cc" => object["cc"],
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"type" => "Create",
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"object" => object
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}
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Notification.get_notified_from_activity(%Activity{data: fake_create_activity}, false)
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end
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def get_notified_from_object(object) do
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Notification.get_notified_from_activity(%Activity{data: object}, false)
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end
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def create_context(context) do
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context = context || generate_id("contexts")
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# Ecto has problems accessing the constraint inside the jsonb,
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# so we explicitly check for the existed object before insert
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object = Object.get_cached_by_ap_id(context)
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with true <- is_nil(object),
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changeset <- Object.context_mapping(context),
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{:ok, inserted_object} <- Repo.insert(changeset) do
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inserted_object
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else
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_ ->
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object
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end
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end
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@doc """
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Enqueues an activity for federation if it's local
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"""
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@spec maybe_federate(any()) :: :ok
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def maybe_federate(%Activity{local: true} = activity) do
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if Pleroma.Config.get!([:instance, :federating]) do
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priority =
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case activity.data["type"] do
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"Delete" -> 10
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"Create" -> 1
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_ -> 5
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end
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Pleroma.Web.Federator.publish(activity, priority)
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end
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:ok
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end
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def maybe_federate(_), do: :ok
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@doc """
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Adds an id and a published data if they aren't there,
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also adds it to an included object
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"""
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def lazy_put_activity_defaults(map, fake \\ false) do
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map =
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unless fake do
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%{data: %{"id" => context}, id: context_id} = create_context(map["context"])
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map
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|> Map.put_new_lazy("id", &generate_activity_id/0)
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|> Map.put_new_lazy("published", &make_date/0)
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|> Map.put_new("context", context)
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|> Map.put_new("context_id", context_id)
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else
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map
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|> Map.put_new("id", "pleroma:fakeid")
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|> Map.put_new_lazy("published", &make_date/0)
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|> Map.put_new("context", "pleroma:fakecontext")
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|> Map.put_new("context_id", -1)
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end
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if is_map(map["object"]) do
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object = lazy_put_object_defaults(map["object"], map, fake)
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%{map | "object" => object}
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else
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map
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end
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end
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@doc """
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Adds an id and published date if they aren't there.
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"""
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def lazy_put_object_defaults(map, activity \\ %{}, fake)
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def lazy_put_object_defaults(map, activity, true = _fake) do
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map
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|> Map.put_new_lazy("published", &make_date/0)
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|> Map.put_new("id", "pleroma:fake_object_id")
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|> Map.put_new("context", activity["context"])
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|> Map.put_new("fake", true)
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|> Map.put_new("context_id", activity["context_id"])
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end
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def lazy_put_object_defaults(map, activity, _fake) do
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map
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|> Map.put_new_lazy("id", &generate_object_id/0)
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|> Map.put_new_lazy("published", &make_date/0)
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|> Map.put_new("context", activity["context"])
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|> Map.put_new("context_id", activity["context_id"])
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end
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@doc """
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Inserts a full object if it is contained in an activity.
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"""
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def insert_full_object(%{"object" => %{"type" => type} = object_data} = map)
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when is_map(object_data) and type in @supported_object_types do
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with {:ok, object} <- Object.create(object_data) do
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map =
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map
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|> Map.put("object", object.data["id"])
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{:ok, map, object}
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end
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end
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def insert_full_object(map), do: {:ok, map, nil}
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#### Like-related helpers
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@doc """
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Returns an existing like if a user already liked an object
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"""
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@spec get_existing_like(String.t(), map()) :: Activity.t() | nil
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def get_existing_like(actor, %{data: %{"id" => id}}) do
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actor
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|> Activity.Queries.by_actor()
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|> Activity.Queries.by_object_id(id)
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|> Activity.Queries.by_type("Like")
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|> Activity.Queries.limit(1)
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|> Repo.one()
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end
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@doc """
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Returns like activities targeting an object
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"""
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def get_object_likes(%{data: %{"id" => id}}) do
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id
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|> Activity.Queries.by_object_id()
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|> Activity.Queries.by_type("Like")
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|> Repo.all()
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end
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def make_emoji_reaction_data(user, object, emoji, activity_id) do
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make_like_data(user, object, activity_id)
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|> Map.put("type", "EmojiReaction")
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|> Map.put("content", emoji)
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end
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@spec make_like_data(User.t(), map(), String.t()) :: map()
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def make_like_data(
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%User{ap_id: ap_id} = actor,
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%{data: %{"actor" => object_actor_id, "id" => id}} = object,
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activity_id
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) do
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object_actor = User.get_cached_by_ap_id(object_actor_id)
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to =
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if Visibility.is_public?(object) do
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[actor.follower_address, object.data["actor"]]
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else
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[object.data["actor"]]
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end
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cc =
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(object.data["to"] ++ (object.data["cc"] || []))
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|> List.delete(actor.ap_id)
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|> List.delete(object_actor.follower_address)
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%{
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"type" => "Like",
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"actor" => ap_id,
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"object" => id,
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"to" => to,
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"cc" => cc,
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"context" => object.data["context"]
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}
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|> maybe_put("id", activity_id)
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end
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@spec update_element_in_object(String.t(), list(any), Object.t()) ::
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{:ok, Object.t()} | {:error, Ecto.Changeset.t()}
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def update_element_in_object(property, element, object) do
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length =
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if is_map(element) do
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element
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|> Map.values()
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|> List.flatten()
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|> length()
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else
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element
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|> length()
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end
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data =
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Map.merge(
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object.data,
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%{"#{property}_count" => length, "#{property}s" => element}
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)
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object
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|> Changeset.change(data: data)
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|> Object.update_and_set_cache()
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end
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@spec add_emoji_reaction_to_object(Activity.t(), Object.t()) ::
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{:ok, Object.t()} | {:error, Ecto.Changeset.t()}
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def add_emoji_reaction_to_object(
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%Activity{data: %{"content" => emoji, "actor" => actor}},
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object
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) do
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reactions = object.data["reactions"] || %{}
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emoji_actors = reactions[emoji] || []
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new_emoji_actors = [actor | emoji_actors] |> Enum.uniq()
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new_reactions = Map.put(reactions, emoji, new_emoji_actors)
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update_element_in_object("reaction", new_reactions, object)
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end
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@spec add_like_to_object(Activity.t(), Object.t()) ::
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{:ok, Object.t()} | {:error, Ecto.Changeset.t()}
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def add_like_to_object(%Activity{data: %{"actor" => actor}}, object) do
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[actor | fetch_likes(object)]
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|> Enum.uniq()
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|> update_likes_in_object(object)
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end
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@spec remove_like_from_object(Activity.t(), Object.t()) ::
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{:ok, Object.t()} | {:error, Ecto.Changeset.t()}
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def remove_like_from_object(%Activity{data: %{"actor" => actor}}, object) do
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object
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|> fetch_likes()
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|> List.delete(actor)
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|> update_likes_in_object(object)
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end
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defp update_likes_in_object(likes, object) do
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update_element_in_object("like", likes, object)
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end
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defp fetch_likes(object) do
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if is_list(object.data["likes"]) do
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object.data["likes"]
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else
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[]
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end
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end
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#### Follow-related helpers
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@doc """
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Updates a follow activity's state (for locked accounts).
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"""
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def update_follow_state_for_all(
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%Activity{data: %{"actor" => actor, "object" => object}} = activity,
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state
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) do
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try do
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Ecto.Adapters.SQL.query!(
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Repo,
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"UPDATE activities SET data = jsonb_set(data, '{state}', $1) WHERE data->>'type' = 'Follow' AND data->>'actor' = $2 AND data->>'object' = $3 AND data->>'state' = 'pending'",
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[state, actor, object]
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)
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User.set_follow_state_cache(actor, object, state)
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activity = Activity.get_by_id(activity.id)
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{:ok, activity}
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rescue
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e ->
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{:error, e}
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end
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end
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def update_follow_state(
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%Activity{data: %{"actor" => actor, "object" => object}} = activity,
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state
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) do
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with new_data <-
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activity.data
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|> Map.put("state", state),
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changeset <- Changeset.change(activity, data: new_data),
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{:ok, activity} <- Repo.update(changeset),
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_ <- User.set_follow_state_cache(actor, object, state) do
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{:ok, activity}
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end
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end
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@doc """
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Makes a follow activity data for the given follower and followed
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"""
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def make_follow_data(
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%User{ap_id: follower_id},
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%User{ap_id: followed_id} = _followed,
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activity_id
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) do
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%{
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"type" => "Follow",
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"actor" => follower_id,
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"to" => [followed_id],
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"cc" => [Pleroma.Constants.as_public()],
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"object" => followed_id,
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"state" => "pending"
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}
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|> maybe_put("id", activity_id)
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end
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def fetch_latest_follow(%User{ap_id: follower_id}, %User{ap_id: followed_id}) do
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query =
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from(
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activity in Activity,
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where:
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fragment(
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"? ->> 'type' = 'Follow'",
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activity.data
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),
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where: activity.actor == ^follower_id,
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# this is to use the index
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where:
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fragment(
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"coalesce((?)->'object'->>'id', (?)->>'object') = ?",
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activity.data,
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activity.data,
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^followed_id
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),
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order_by: [fragment("? desc nulls last", activity.id)],
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limit: 1
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)
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Repo.one(query)
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end
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#### Announce-related helpers
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@doc """
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Retruns an existing announce activity if the notice has already been announced
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"""
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def get_existing_announce(actor, %{data: %{"id" => id}}) do
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query =
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from(
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activity in Activity,
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where: activity.actor == ^actor,
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# this is to use the index
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where:
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fragment(
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"coalesce((?)->'object'->>'id', (?)->>'object') = ?",
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activity.data,
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activity.data,
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^id
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),
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where: fragment("(?)->>'type' = 'Announce'", activity.data)
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)
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Repo.one(query)
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end
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@doc """
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Make announce activity data for the given actor and object
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"""
|
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# for relayed messages, we only want to send to subscribers
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def make_announce_data(
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%User{ap_id: ap_id} = user,
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%Object{data: %{"id" => id}} = object,
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activity_id,
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false
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) do
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%{
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"type" => "Announce",
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"actor" => ap_id,
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"object" => id,
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"to" => [user.follower_address],
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"cc" => [],
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"context" => object.data["context"]
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}
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|> maybe_put("id", activity_id)
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end
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def make_announce_data(
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%User{ap_id: ap_id} = user,
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%Object{data: %{"id" => id}} = object,
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activity_id,
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true
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) do
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%{
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"type" => "Announce",
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"actor" => ap_id,
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"object" => id,
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"to" => [user.follower_address, object.data["actor"]],
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"cc" => [Pleroma.Constants.as_public()],
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"context" => object.data["context"]
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}
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|> maybe_put("id", activity_id)
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end
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@doc """
|
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Make unannounce activity data for the given actor and object
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"""
|
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def make_unannounce_data(
|
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%User{ap_id: ap_id} = user,
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%Activity{data: %{"context" => context}} = activity,
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activity_id
|
|
) do
|
|
%{
|
|
"type" => "Undo",
|
|
"actor" => ap_id,
|
|
"object" => activity.data,
|
|
"to" => [user.follower_address, activity.data["actor"]],
|
|
"cc" => [Pleroma.Constants.as_public()],
|
|
"context" => context
|
|
}
|
|
|> maybe_put("id", activity_id)
|
|
end
|
|
|
|
def make_unlike_data(
|
|
%User{ap_id: ap_id} = user,
|
|
%Activity{data: %{"context" => context}} = activity,
|
|
activity_id
|
|
) do
|
|
%{
|
|
"type" => "Undo",
|
|
"actor" => ap_id,
|
|
"object" => activity.data,
|
|
"to" => [user.follower_address, activity.data["actor"]],
|
|
"cc" => [Pleroma.Constants.as_public()],
|
|
"context" => context
|
|
}
|
|
|> maybe_put("id", activity_id)
|
|
end
|
|
|
|
def add_announce_to_object(
|
|
%Activity{
|
|
data: %{"actor" => actor, "cc" => [Pleroma.Constants.as_public()]}
|
|
},
|
|
object
|
|
) do
|
|
announcements =
|
|
if is_list(object.data["announcements"]), do: object.data["announcements"], else: []
|
|
|
|
with announcements <- [actor | announcements] |> Enum.uniq() do
|
|
update_element_in_object("announcement", announcements, object)
|
|
end
|
|
end
|
|
|
|
def add_announce_to_object(_, object), do: {:ok, object}
|
|
|
|
def remove_announce_from_object(%Activity{data: %{"actor" => actor}}, object) do
|
|
announcements =
|
|
if is_list(object.data["announcements"]), do: object.data["announcements"], else: []
|
|
|
|
with announcements <- announcements |> List.delete(actor) do
|
|
update_element_in_object("announcement", announcements, object)
|
|
end
|
|
end
|
|
|
|
#### Unfollow-related helpers
|
|
|
|
def make_unfollow_data(follower, followed, follow_activity, activity_id) do
|
|
%{
|
|
"type" => "Undo",
|
|
"actor" => follower.ap_id,
|
|
"to" => [followed.ap_id],
|
|
"object" => follow_activity.data
|
|
}
|
|
|> maybe_put("id", activity_id)
|
|
end
|
|
|
|
#### Block-related helpers
|
|
def fetch_latest_block(%User{ap_id: blocker_id}, %User{ap_id: blocked_id}) do
|
|
query =
|
|
from(
|
|
activity in Activity,
|
|
where:
|
|
fragment(
|
|
"? ->> 'type' = 'Block'",
|
|
activity.data
|
|
),
|
|
where: activity.actor == ^blocker_id,
|
|
# this is to use the index
|
|
where:
|
|
fragment(
|
|
"coalesce((?)->'object'->>'id', (?)->>'object') = ?",
|
|
activity.data,
|
|
activity.data,
|
|
^blocked_id
|
|
),
|
|
order_by: [fragment("? desc nulls last", activity.id)],
|
|
limit: 1
|
|
)
|
|
|
|
Repo.one(query)
|
|
end
|
|
|
|
def make_block_data(blocker, blocked, activity_id) do
|
|
%{
|
|
"type" => "Block",
|
|
"actor" => blocker.ap_id,
|
|
"to" => [blocked.ap_id],
|
|
"object" => blocked.ap_id
|
|
}
|
|
|> maybe_put("id", activity_id)
|
|
end
|
|
|
|
def make_unblock_data(blocker, blocked, block_activity, activity_id) do
|
|
%{
|
|
"type" => "Undo",
|
|
"actor" => blocker.ap_id,
|
|
"to" => [blocked.ap_id],
|
|
"object" => block_activity.data
|
|
}
|
|
|> maybe_put("id", activity_id)
|
|
end
|
|
|
|
#### Create-related helpers
|
|
|
|
def make_create_data(params, additional) do
|
|
published = params.published || make_date()
|
|
|
|
%{
|
|
"type" => "Create",
|
|
"to" => params.to |> Enum.uniq(),
|
|
"actor" => params.actor.ap_id,
|
|
"object" => params.object,
|
|
"published" => published,
|
|
"context" => params.context
|
|
}
|
|
|> Map.merge(additional)
|
|
end
|
|
|
|
#### Flag-related helpers
|
|
|
|
def make_flag_data(params, additional) do
|
|
status_ap_ids =
|
|
Enum.map(params.statuses || [], fn
|
|
%Activity{} = act -> act.data["id"]
|
|
act when is_map(act) -> act["id"]
|
|
act when is_binary(act) -> act
|
|
end)
|
|
|
|
object = [params.account.ap_id] ++ status_ap_ids
|
|
|
|
%{
|
|
"type" => "Flag",
|
|
"actor" => params.actor.ap_id,
|
|
"content" => params.content,
|
|
"object" => object,
|
|
"context" => params.context,
|
|
"state" => "open"
|
|
}
|
|
|> Map.merge(additional)
|
|
end
|
|
|
|
@doc """
|
|
Fetches the OrderedCollection/OrderedCollectionPage from `from`, limiting the amount of pages fetched after
|
|
the first one to `pages_left` pages.
|
|
If the amount of pages is higher than the collection has, it returns whatever was there.
|
|
"""
|
|
def fetch_ordered_collection(from, pages_left, acc \\ []) do
|
|
with {:ok, response} <- Tesla.get(from),
|
|
{:ok, collection} <- Jason.decode(response.body) do
|
|
case collection["type"] do
|
|
"OrderedCollection" ->
|
|
# If we've encountered the OrderedCollection and not the page,
|
|
# just call the same function on the page address
|
|
fetch_ordered_collection(collection["first"], pages_left)
|
|
|
|
"OrderedCollectionPage" ->
|
|
if pages_left > 0 do
|
|
# There are still more pages
|
|
if Map.has_key?(collection, "next") do
|
|
# There are still more pages, go deeper saving what we have into the accumulator
|
|
fetch_ordered_collection(
|
|
collection["next"],
|
|
pages_left - 1,
|
|
acc ++ collection["orderedItems"]
|
|
)
|
|
else
|
|
# No more pages left, just return whatever we already have
|
|
acc ++ collection["orderedItems"]
|
|
end
|
|
else
|
|
# Got the amount of pages needed, add them all to the accumulator
|
|
acc ++ collection["orderedItems"]
|
|
end
|
|
|
|
_ ->
|
|
{:error, "Not an OrderedCollection or OrderedCollectionPage"}
|
|
end
|
|
end
|
|
end
|
|
|
|
#### Report-related helpers
|
|
|
|
def update_report_state(%Activity{} = activity, state) when state in @supported_report_states do
|
|
with new_data <- Map.put(activity.data, "state", state),
|
|
changeset <- Changeset.change(activity, data: new_data),
|
|
{:ok, activity} <- Repo.update(changeset) do
|
|
{:ok, activity}
|
|
end
|
|
end
|
|
|
|
def update_report_state(_, _), do: {:error, "Unsupported state"}
|
|
|
|
def update_activity_visibility(activity, visibility) when visibility in @valid_visibilities do
|
|
[to, cc, recipients] =
|
|
activity
|
|
|> get_updated_targets(visibility)
|
|
|> Enum.map(&Enum.uniq/1)
|
|
|
|
object_data =
|
|
activity.object.data
|
|
|> Map.put("to", to)
|
|
|> Map.put("cc", cc)
|
|
|
|
{:ok, object} =
|
|
activity.object
|
|
|> Object.change(%{data: object_data})
|
|
|> Object.update_and_set_cache()
|
|
|
|
activity_data =
|
|
activity.data
|
|
|> Map.put("to", to)
|
|
|> Map.put("cc", cc)
|
|
|
|
activity
|
|
|> Map.put(:object, object)
|
|
|> Activity.change(%{data: activity_data, recipients: recipients})
|
|
|> Repo.update()
|
|
end
|
|
|
|
def update_activity_visibility(_, _), do: {:error, "Unsupported visibility"}
|
|
|
|
defp get_updated_targets(
|
|
%Activity{data: %{"to" => to} = data, recipients: recipients},
|
|
visibility
|
|
) do
|
|
cc = Map.get(data, "cc", [])
|
|
follower_address = User.get_cached_by_ap_id(data["actor"]).follower_address
|
|
public = Pleroma.Constants.as_public()
|
|
|
|
case visibility do
|
|
"public" ->
|
|
to = [public | List.delete(to, follower_address)]
|
|
cc = [follower_address | List.delete(cc, public)]
|
|
recipients = [public | recipients]
|
|
[to, cc, recipients]
|
|
|
|
"private" ->
|
|
to = [follower_address | List.delete(to, public)]
|
|
cc = List.delete(cc, public)
|
|
recipients = List.delete(recipients, public)
|
|
[to, cc, recipients]
|
|
|
|
"unlisted" ->
|
|
to = [follower_address | List.delete(to, public)]
|
|
cc = [public | List.delete(cc, follower_address)]
|
|
recipients = recipients ++ [follower_address, public]
|
|
[to, cc, recipients]
|
|
|
|
_ ->
|
|
[to, cc, recipients]
|
|
end
|
|
end
|
|
|
|
def get_existing_votes(actor, %{data: %{"id" => id}}) do
|
|
query =
|
|
from(
|
|
[activity, object: object] in Activity.with_preloaded_object(Activity),
|
|
where: fragment("(?)->>'type' = 'Create'", activity.data),
|
|
where: fragment("(?)->>'actor' = ?", activity.data, ^actor),
|
|
where:
|
|
fragment(
|
|
"(?)->>'inReplyTo' = ?",
|
|
object.data,
|
|
^to_string(id)
|
|
),
|
|
where: fragment("(?)->>'type' = 'Answer'", object.data)
|
|
)
|
|
|
|
Repo.all(query)
|
|
end
|
|
|
|
defp maybe_put(map, _key, nil), do: map
|
|
defp maybe_put(map, key, value), do: Map.put(map, key, value)
|
|
end
|