630 lines
17 KiB
Elixir
630 lines
17 KiB
Elixir
defmodule Pleroma.Web.ActivityPub.Transmogrifier do
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@moduledoc """
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A module to handle coding from internal to wire ActivityPub and back.
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"""
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alias Pleroma.User
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alias Pleroma.Object
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alias Pleroma.Activity
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alias Pleroma.Repo
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alias Pleroma.Web.ActivityPub.ActivityPub
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alias Pleroma.Web.ActivityPub.Utils
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import Ecto.Query
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require Logger
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@doc """
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Modifies an incoming AP object (mastodon format) to our internal format.
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"""
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def fix_object(object) do
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object
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|> Map.put("actor", object["attributedTo"])
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|> fix_attachments
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|> fix_context
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|> fix_in_reply_to
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|> fix_emoji
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|> fix_tag
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end
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def fix_in_reply_to(%{"inReplyTo" => in_reply_to_id} = object)
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when not is_nil(in_reply_to_id) do
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case ActivityPub.fetch_object_from_id(in_reply_to_id) do
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{:ok, replied_object} ->
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activity = Activity.get_create_activity_by_object_ap_id(replied_object.data["id"])
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object
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|> Map.put("inReplyTo", replied_object.data["id"])
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|> Map.put("inReplyToAtomUri", object["inReplyToAtomUri"] || in_reply_to_id)
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|> Map.put("inReplyToStatusId", activity.id)
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|> Map.put("conversation", replied_object.data["context"] || object["conversation"])
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|> Map.put("context", replied_object.data["context"] || object["conversation"])
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e ->
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Logger.error("Couldn't fetch #{object["inReplyTo"]} #{inspect(e)}")
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object
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end
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end
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def fix_in_reply_to(object), do: object
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def fix_context(object) do
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object
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|> Map.put("context", object["conversation"])
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end
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def fix_attachments(object) do
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attachments =
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(object["attachment"] || [])
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|> Enum.map(fn data ->
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url = [%{"type" => "Link", "mediaType" => data["mediaType"], "href" => data["url"]}]
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Map.put(data, "url", url)
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end)
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object
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|> Map.put("attachment", attachments)
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end
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def fix_emoji(object) do
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tags = object["tag"] || []
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emoji = tags |> Enum.filter(fn data -> data["type"] == "Emoji" and data["icon"] end)
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emoji =
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emoji
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|> Enum.reduce(%{}, fn data, mapping ->
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name = data["name"]
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name =
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if String.starts_with?(name, ":") do
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name |> String.slice(1..-2)
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else
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name
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end
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mapping |> Map.put(name, data["icon"]["url"])
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end)
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# we merge mastodon and pleroma emoji into a single mapping, to allow for both wire formats
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emoji = Map.merge(object["emoji"] || %{}, emoji)
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object
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|> Map.put("emoji", emoji)
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end
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def fix_tag(object) do
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tags =
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(object["tag"] || [])
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|> Enum.filter(fn data -> data["type"] == "Hashtag" and data["name"] end)
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|> Enum.map(fn data -> String.slice(data["name"], 1..-1) end)
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combined = (object["tag"] || []) ++ tags
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object
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|> Map.put("tag", combined)
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end
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# TODO: validate those with a Ecto scheme
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# - tags
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# - emoji
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def handle_incoming(%{"type" => "Create", "object" => %{"type" => "Note"} = object} = data) do
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with nil <- Activity.get_create_activity_by_object_ap_id(object["id"]),
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%User{} = user <- User.get_or_fetch_by_ap_id(data["actor"]) do
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object = fix_object(data["object"])
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params = %{
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to: data["to"],
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object: object,
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actor: user,
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context: object["conversation"],
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local: false,
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published: data["published"],
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additional:
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Map.take(data, [
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"cc",
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"id"
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])
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}
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ActivityPub.create(params)
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else
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%Activity{} = activity -> {:ok, activity}
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_e -> :error
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end
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end
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def handle_incoming(
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%{"type" => "Follow", "object" => followed, "actor" => follower, "id" => id} = data
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) do
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with %User{local: true} = followed <- User.get_cached_by_ap_id(followed),
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%User{} = follower <- User.get_or_fetch_by_ap_id(follower),
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{:ok, activity} <- ActivityPub.follow(follower, followed, id, false) do
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ActivityPub.accept(%{to: [follower.ap_id], actor: followed.ap_id, object: data, local: true})
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User.follow(follower, followed)
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{:ok, activity}
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else
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_e -> :error
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end
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end
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defp mastodon_follow_hack(%{"id" => id, "actor" => follower_id}, followed) do
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with true <- id =~ "follows",
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%User{local: true} = follower <- User.get_cached_by_ap_id(follower_id),
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%Activity{} = activity <- Utils.fetch_latest_follow(follower, followed) do
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{:ok, activity}
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else
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_ -> {:error, nil}
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end
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end
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defp mastodon_follow_hack(_), do: {:error, nil}
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defp get_follow_activity(follow_object, followed) do
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with object_id when not is_nil(object_id) <- Utils.get_ap_id(follow_object),
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{_, %Activity{} = activity} <- {:activity, Activity.get_by_ap_id(object_id)} do
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{:ok, activity}
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else
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# Can't find the activity. This might a Mastodon 2.3 "Accept"
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{:activity, nil} ->
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mastodon_follow_hack(follow_object, followed)
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_ ->
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{:error, nil}
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end
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end
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def handle_incoming(
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%{"type" => "Accept", "object" => follow_object, "actor" => actor, "id" => id} = data
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) do
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with %User{} = followed <- User.get_or_fetch_by_ap_id(actor),
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{:ok, follow_activity} <- get_follow_activity(follow_object, followed),
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%User{local: true} = follower <- User.get_cached_by_ap_id(follow_activity.data["actor"]),
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{:ok, activity} <- ActivityPub.accept(%{to: follow_activity.data["to"], type: "Accept", actor: followed.ap_id, object: follow_activity.data["id"], local: false}) do
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if not User.following?(follower, followed) do
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{:ok, follower} = User.follow(follower, followed)
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end
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{:ok, activity}
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else
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_e -> :error
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end
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end
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def handle_incoming(
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%{"type" => "Reject", "object" => follow_object, "actor" => actor, "id" => id} = data
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) do
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with %User{} = followed <- User.get_or_fetch_by_ap_id(actor),
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{:ok, follow_activity} <- get_follow_activity(follow_object, followed),
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%User{local: true} = follower <- User.get_cached_by_ap_id(follow_activity.data["actor"]),
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{:ok, activity} <- ActivityPub.accept(%{to: follow_activity.data["to"], type: "Accept", actor: followed.ap_id, object: follow_activity.data["id"], local: false}) do
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User.unfollow(follower, followed)
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{:ok, activity}
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else
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_e -> :error
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end
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end
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def handle_incoming(
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%{"type" => "Like", "object" => object_id, "actor" => actor, "id" => id} = _data
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) do
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with %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
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{:ok, object} <-
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get_obj_helper(object_id) || ActivityPub.fetch_object_from_id(object_id),
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{:ok, activity, _object} <- ActivityPub.like(actor, object, id, false) do
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{:ok, activity}
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else
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_e -> :error
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end
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end
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def handle_incoming(
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%{"type" => "Announce", "object" => object_id, "actor" => actor, "id" => id} = _data
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) do
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with %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
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{:ok, object} <-
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get_obj_helper(object_id) || ActivityPub.fetch_object_from_id(object_id),
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{:ok, activity, _object} <- ActivityPub.announce(actor, object, id, false) do
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{:ok, activity}
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else
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_e -> :error
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end
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end
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def handle_incoming(
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%{"type" => "Update", "object" => %{"type" => "Person"} = object, "actor" => actor_id} =
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data
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) do
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with %User{ap_id: ^actor_id} = actor <- User.get_by_ap_id(object["id"]) do
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{:ok, new_user_data} = ActivityPub.user_data_from_user_object(object)
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banner = new_user_data[:info]["banner"]
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update_data =
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new_user_data
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|> Map.take([:name, :bio, :avatar])
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|> Map.put(:info, Map.merge(actor.info, %{"banner" => banner}))
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actor
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|> User.upgrade_changeset(update_data)
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|> User.update_and_set_cache()
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ActivityPub.update(%{
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local: false,
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to: data["to"] || [],
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cc: data["cc"] || [],
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object: object,
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actor: actor_id
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})
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else
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e ->
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Logger.error(e)
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:error
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end
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end
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# TODO: Make secure.
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def handle_incoming(
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%{"type" => "Delete", "object" => object_id, "actor" => actor, "id" => _id} = _data
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) do
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object_id = Utils.get_ap_id(object_id)
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with %User{} = _actor <- User.get_or_fetch_by_ap_id(actor),
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{:ok, object} <-
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get_obj_helper(object_id) || ActivityPub.fetch_object_from_id(object_id),
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{:ok, activity} <- ActivityPub.delete(object, false) do
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{:ok, activity}
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else
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_e -> :error
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end
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end
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def handle_incoming(
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%{
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"type" => "Undo",
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"object" => %{"type" => "Announce", "object" => object_id},
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"actor" => actor,
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"id" => id
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} = _data
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) do
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with %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
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{:ok, object} <-
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get_obj_helper(object_id) || ActivityPub.fetch_object_from_id(object_id),
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{:ok, activity, _, _} <- ActivityPub.unannounce(actor, object, id, false) do
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{:ok, activity}
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else
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_e -> :error
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end
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end
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def handle_incoming(
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%{
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"type" => "Undo",
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"object" => %{"type" => "Follow", "object" => followed},
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"actor" => follower,
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"id" => id
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} = _data
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) do
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with %User{local: true} = followed <- User.get_cached_by_ap_id(followed),
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%User{} = follower <- User.get_or_fetch_by_ap_id(follower),
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{:ok, activity} <- ActivityPub.unfollow(follower, followed, id, false) do
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User.unfollow(follower, followed)
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{:ok, activity}
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else
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e -> :error
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end
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end
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def handle_incoming(
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%{
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"type" => "Undo",
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"object" => %{"type" => "Block", "object" => blocked},
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"actor" => blocker,
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"id" => id
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} = _data
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) do
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with %User{local: true} = blocked <- User.get_cached_by_ap_id(blocked),
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%User{} = blocker <- User.get_or_fetch_by_ap_id(blocker),
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{:ok, activity} <- ActivityPub.unblock(blocker, blocked, id, false) do
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User.unblock(blocker, blocked)
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{:ok, activity}
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else
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e -> :error
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end
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end
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def handle_incoming(
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%{"type" => "Block", "object" => blocked, "actor" => blocker, "id" => id} = data
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) do
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with %User{local: true} = blocked = User.get_cached_by_ap_id(blocked),
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%User{} = blocker = User.get_or_fetch_by_ap_id(blocker),
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{:ok, activity} <- ActivityPub.block(blocker, blocked, id, false) do
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User.unfollow(blocker, blocked)
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User.block(blocker, blocked)
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{:ok, activity}
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else
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e -> :error
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end
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end
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def handle_incoming(
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%{
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"type" => "Undo",
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"object" => %{"type" => "Like", "object" => object_id},
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"actor" => actor,
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"id" => id
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} = _data
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) do
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with %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
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{:ok, object} <-
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get_obj_helper(object_id) || ActivityPub.fetch_object_from_id(object_id),
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{:ok, activity, _, _} <- ActivityPub.unlike(actor, object, id, false) do
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{:ok, activity}
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else
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_e -> :error
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end
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end
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def handle_incoming(_), do: :error
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def get_obj_helper(id) do
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if object = Object.get_by_ap_id(id), do: {:ok, object}, else: nil
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end
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def set_reply_to_uri(%{"inReplyTo" => inReplyTo} = object) do
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with false <- String.starts_with?(inReplyTo, "http"),
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{:ok, %{data: replied_to_object}} <- get_obj_helper(inReplyTo) do
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Map.put(object, "inReplyTo", replied_to_object["external_url"] || inReplyTo)
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else
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_e -> object
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end
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end
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def set_reply_to_uri(obj), do: obj
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# Prepares the object of an outgoing create activity.
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def prepare_object(object) do
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object
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|> set_sensitive
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|> add_hashtags
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|> add_mention_tags
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|> add_emoji_tags
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|> add_attributed_to
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|> prepare_attachments
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|> set_conversation
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|> set_reply_to_uri
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end
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# @doc
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# """
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# internal -> Mastodon
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# """
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def prepare_outgoing(%{"type" => "Create", "object" => %{"type" => "Note"} = object} = data) do
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object =
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object
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|> prepare_object
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data =
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data
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|> Map.put("object", object)
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|> Map.put("@context", "https://www.w3.org/ns/activitystreams")
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{:ok, data}
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end
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def prepare_outgoing(%{"type" => _type} = data) do
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data =
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data
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|> maybe_fix_object_url
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|> Map.put("@context", "https://www.w3.org/ns/activitystreams")
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{:ok, data}
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end
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def maybe_fix_object_url(data) do
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if is_binary(data["object"]) and not String.starts_with?(data["object"], "http") do
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case ActivityPub.fetch_object_from_id(data["object"]) do
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{:ok, relative_object} ->
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if relative_object.data["external_url"] do
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_data =
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data
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|> Map.put("object", relative_object.data["external_url"])
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else
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data
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end
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e ->
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Logger.error("Couldn't fetch #{data["object"]} #{inspect(e)}")
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data
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end
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else
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data
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end
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end
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def add_hashtags(object) do
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tags =
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(object["tag"] || [])
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|> Enum.map(fn tag ->
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%{
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"href" => Pleroma.Web.Endpoint.url() <> "/tags/#{tag}",
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"name" => "##{tag}",
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"type" => "Hashtag"
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}
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end)
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object
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|> Map.put("tag", tags)
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end
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def add_mention_tags(object) do
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recipients = object["to"] ++ (object["cc"] || [])
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mentions =
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recipients
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|> Enum.map(fn ap_id -> User.get_cached_by_ap_id(ap_id) end)
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|> Enum.filter(& &1)
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|> Enum.map(fn user ->
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%{"type" => "Mention", "href" => user.ap_id, "name" => "@#{user.nickname}"}
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end)
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tags = object["tag"] || []
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object
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|> Map.put("tag", tags ++ mentions)
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end
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# TODO: we should probably send mtime instead of unix epoch time for updated
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def add_emoji_tags(object) do
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tags = object["tag"] || []
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emoji = object["emoji"] || []
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out =
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emoji
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|> Enum.map(fn {name, url} ->
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%{
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"icon" => %{"url" => url, "type" => "Image"},
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"name" => ":" <> name <> ":",
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"type" => "Emoji",
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"updated" => "1970-01-01T00:00:00Z",
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"id" => url
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}
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end)
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object
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|> Map.put("tag", tags ++ out)
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end
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def set_conversation(object) do
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Map.put(object, "conversation", object["context"])
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end
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def set_sensitive(object) do
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tags = object["tag"] || []
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Map.put(object, "sensitive", "nsfw" in tags)
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end
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def add_attributed_to(object) do
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attributedTo = object["attributedTo"] || object["actor"]
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object
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|> Map.put("attributedTo", attributedTo)
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end
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def prepare_attachments(object) do
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attachments =
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(object["attachment"] || [])
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|> Enum.map(fn data ->
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[%{"mediaType" => media_type, "href" => href} | _] = data["url"]
|
|
%{"url" => href, "mediaType" => media_type, "name" => data["name"], "type" => "Document"}
|
|
end)
|
|
|
|
object
|
|
|> Map.put("attachment", attachments)
|
|
end
|
|
|
|
defp user_upgrade_task(user) do
|
|
old_follower_address = User.ap_followers(user)
|
|
|
|
q =
|
|
from(
|
|
u in User,
|
|
where: ^old_follower_address in u.following,
|
|
update: [
|
|
set: [
|
|
following:
|
|
fragment(
|
|
"array_replace(?,?,?)",
|
|
u.following,
|
|
^old_follower_address,
|
|
^user.follower_address
|
|
)
|
|
]
|
|
]
|
|
)
|
|
|
|
Repo.update_all(q, [])
|
|
|
|
maybe_retire_websub(user.ap_id)
|
|
|
|
# Only do this for recent activties, don't go through the whole db.
|
|
# Only look at the last 1000 activities.
|
|
since = (Repo.aggregate(Activity, :max, :id) || 0) - 1_000
|
|
|
|
q =
|
|
from(
|
|
a in Activity,
|
|
where: ^old_follower_address in a.recipients,
|
|
where: a.id > ^since,
|
|
update: [
|
|
set: [
|
|
recipients:
|
|
fragment(
|
|
"array_replace(?,?,?)",
|
|
a.recipients,
|
|
^old_follower_address,
|
|
^user.follower_address
|
|
)
|
|
]
|
|
]
|
|
)
|
|
|
|
Repo.update_all(q, [])
|
|
end
|
|
|
|
def upgrade_user_from_ap_id(ap_id, async \\ true) do
|
|
with %User{local: false} = user <- User.get_by_ap_id(ap_id),
|
|
{:ok, data} <- ActivityPub.fetch_and_prepare_user_from_ap_id(ap_id) do
|
|
data =
|
|
data
|
|
|> Map.put(:info, Map.merge(user.info, data[:info]))
|
|
|
|
already_ap = User.ap_enabled?(user)
|
|
|
|
{:ok, user} =
|
|
User.upgrade_changeset(user, data)
|
|
|> Repo.update()
|
|
|
|
if !already_ap do
|
|
# This could potentially take a long time, do it in the background
|
|
if async do
|
|
Task.start(fn ->
|
|
user_upgrade_task(user)
|
|
end)
|
|
else
|
|
user_upgrade_task(user)
|
|
end
|
|
end
|
|
|
|
{:ok, user}
|
|
else
|
|
e -> e
|
|
end
|
|
end
|
|
|
|
def maybe_retire_websub(ap_id) do
|
|
# some sanity checks
|
|
if is_binary(ap_id) && String.length(ap_id) > 8 do
|
|
q =
|
|
from(
|
|
ws in Pleroma.Web.Websub.WebsubClientSubscription,
|
|
where: fragment("? like ?", ws.topic, ^"#{ap_id}%")
|
|
)
|
|
|
|
Repo.delete_all(q)
|
|
end
|
|
end
|
|
|
|
def maybe_fix_user_url(data) do
|
|
if is_map(data["url"]) do
|
|
Map.put(data, "url", data["url"]["href"])
|
|
else
|
|
data
|
|
end
|
|
end
|
|
|
|
def maybe_fix_user_object(data) do
|
|
data
|
|
|> maybe_fix_user_url
|
|
end
|
|
end
|