299 lines
9.0 KiB
Elixir
299 lines
9.0 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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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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end
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def fix_in_reply_to(%{"inReplyTo" => in_reply_to_id} = object) 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 = (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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# 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: 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(%{"type" => "Follow", "object" => followed, "actor" => follower, "id" => id} = data) 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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def handle_incoming(%{"type" => "Like", "object" => object_id, "actor" => actor, "id" => id} = data) do
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with %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
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{:ok, object} <- 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(%{"type" => "Announce", "object" => object_id, "actor" => actor, "id" => id} = data) do
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with %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
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{:ok, object} <- 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(%{"type" => "Update", "object" => %{"type" => "Person"} = object, "actor" => actor_id} = data) 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 = 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(%{local: false, to: data["to"] || [], cc: data["cc"] || [], object: object, actor: actor_id})
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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(%{"type" => "Delete", "object" => object_id, "actor" => actor, "id" => id} = data) do
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object_id = case object_id do
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%{"id" => id} -> id
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id -> id
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end
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with %User{} = actor <- User.get_or_fetch_by_ap_id(actor),
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{:ok, object} <- 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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# TODO
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# Accept
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# Undo
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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 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_attributed_to
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|> prepare_attachments
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|> set_conversation
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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 = object
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|> prepare_object
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data = 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 = data
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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 add_hashtags(object) do
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tags = (object["tag"] || [])
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|> Enum.map fn (tag) -> %{"href" => Pleroma.Web.Endpoint.url() <> "/tags/#{tag}", "name" => "##{tag}", "type" => "Hashtag"} 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 = 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) -> %{"type" => "Mention", "href" => user.ap_id, "name" => "@#{user.nickname}"} 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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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 = (object["attachment"] || [])
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|> Enum.map(fn (data) ->
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[%{"mediaType" => media_type, "href" => href} | _] = data["url"]
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%{"url" => href, "mediaType" => media_type, "name" => data["name"], "type" => "Document"}
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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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defp user_upgrade_task(user) do
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old_follower_address = User.ap_followers(user)
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q = from u in User,
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where: ^old_follower_address in u.following,
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update: [set: [following: fragment("array_replace(?,?,?)", u.following, ^old_follower_address, ^user.follower_address)]]
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Repo.update_all(q, [])
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maybe_retire_websub(user.ap_id)
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# Only do this for recent activties, don't go through the whole db.
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since = (Repo.aggregate(Activity, :max, :id) || 0) - 100_000
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q = from a in Activity,
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where: ^old_follower_address in a.recipients,
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where: a.id > ^since,
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update: [set: [recipients: fragment("array_replace(?,?,?)", a.recipients, ^old_follower_address, ^user.follower_address)]]
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Repo.update_all(q, [])
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end
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def upgrade_user_from_ap_id(ap_id, async \\ true) do
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with %User{local: false} = user <- User.get_by_ap_id(ap_id),
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{:ok, data} <- ActivityPub.fetch_and_prepare_user_from_ap_id(ap_id) do
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data = data
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|> Map.put(:info, Map.merge(user.info, data[:info]))
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already_ap = User.ap_enabled?(user)
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{:ok, user} = User.upgrade_changeset(user, data)
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|> Repo.update()
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if !already_ap do
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# This could potentially take a long time, do it in the background
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if async do
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Task.start(fn ->
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user_upgrade_task(user)
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end)
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else
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user_upgrade_task(user)
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end
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end
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{:ok, user}
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else
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e -> e
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end
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end
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def maybe_retire_websub(ap_id) do
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# some sanity checks
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if is_binary(ap_id) && (String.length(ap_id) > 8) do
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q = from ws in Pleroma.Web.Websub.WebsubClientSubscription,
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where: fragment("? like ?", ws.topic, ^"#{ap_id}%")
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Repo.delete_all(q)
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end
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end
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end
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