292 lines
8 KiB
Elixir
292 lines
8 KiB
Elixir
defmodule Pleroma.Web.ActivityPub.Utils do
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alias Pleroma.{Repo, Web, Object, Activity, User}
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alias Pleroma.Web.Router.Helpers
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alias Pleroma.Web.Endpoint
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alias Ecto.{Changeset, UUID}
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import Ecto.Query
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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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"https://w3id.org/security/v1",
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%{
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"manuallyApprovesFollowers" => "as:manuallyApprovesFollowers",
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"sensitive" => "as:sensitive",
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"Hashtag" => "as:Hashtag",
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"ostatus" => "http://ostatus.org#",
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"atomUri" => "ostatus:atomUri",
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"inReplyToAtomUri" => "ostatus:inReplyToAtomUri",
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"conversation" => "ostatus:conversation",
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"toot" => "http://joinmastodon.org/ns#",
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"Emoji" => "toot:Emoji"
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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 create_context(context) do
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context = context || generate_id("contexts")
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changeset = Object.context_mapping(context)
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case Repo.insert(changeset) do
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{:ok, object} ->
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object
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# This should be solved by an upsert, but it seems ecto
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# has problems accessing the constraint inside the jsonb.
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{:error, _} ->
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Object.get_cached_by_ap_id(context)
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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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def maybe_federate(%Activity{local: true} = activity) 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.enqueue(:publish, activity, priority)
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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) 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
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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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if is_map(map["object"]) do
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object = lazy_put_object_defaults(map["object"], map)
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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 \\ %{}) 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})
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when is_map(object_data) and type in ["Note"] do
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with {:ok, _} <- Object.create(object_data) do
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:ok
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end
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end
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def insert_full_object(_), do: :ok
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def update_object_in_activities(%{data: %{"id" => id}} = object) do
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# TODO
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# Update activities that already had this. Could be done in a seperate process.
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# Alternatively, just don't do this and fetch the current object each time. Most
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# could probably be taken from cache.
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relevant_activities = Activity.all_by_object_ap_id(id)
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Enum.map(relevant_activities, fn activity ->
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new_activity_data = activity.data |> Map.put("object", object.data)
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changeset = Changeset.change(activity, data: new_activity_data)
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Repo.update(changeset)
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end)
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end
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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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def get_existing_like(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: fragment("(?)->>'actor' = ?", activity.data, ^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' = 'Like'", activity.data)
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)
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Repo.one(query)
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end
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def make_like_data(%User{ap_id: ap_id} = actor, %{data: %{"id" => id}} = object, activity_id) do
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data = %{
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"type" => "Like",
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"actor" => ap_id,
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"object" => id,
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"to" => [actor.follower_address, object.data["actor"]],
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"cc" => ["https://www.w3.org/ns/activitystreams#Public"],
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"context" => object.data["context"]
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}
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if activity_id, do: Map.put(data, "id", activity_id), else: data
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end
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def update_element_in_object(property, element, object) do
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with new_data <-
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object.data
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|> Map.put("#{property}_count", length(element))
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|> Map.put("#{property}s", element),
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changeset <- Changeset.change(object, data: new_data),
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{:ok, object} <- Repo.update(changeset),
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_ <- update_object_in_activities(object) do
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{:ok, object}
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end
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end
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def 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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def add_like_to_object(%Activity{data: %{"actor" => actor}}, object) do
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with likes <- [actor | object.data["likes"] || []] |> Enum.uniq() do
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update_likes_in_object(likes, object)
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end
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end
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def remove_like_from_object(%Activity{data: %{"actor" => actor}}, object) do
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with likes <- (object.data["likes"] || []) |> List.delete(actor) do
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update_likes_in_object(likes, object)
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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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Makes a follow activity data for the given follower and followed
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"""
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def make_follow_data(%User{ap_id: follower_id}, %User{ap_id: followed_id}, activity_id) do
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data = %{
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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" => ["https://www.w3.org/ns/activitystreams#Public"],
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"object" => followed_id
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}
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if activity_id, do: Map.put(data, "id", activity_id), else: data
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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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"? @> ?",
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activity.data,
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^%{type: "Follow", actor: follower_id, object: followed_id}
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),
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order_by: [desc: :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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Make announce activity data for the given actor and object
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"""
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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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) do
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data = %{
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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" => ["https://www.w3.org/ns/activitystreams#Public"],
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"context" => object.data["context"]
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}
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if activity_id, do: Map.put(data, "id", activity_id), else: data
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end
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def add_announce_to_object(%Activity{data: %{"actor" => actor}}, object) do
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with announcements <- [actor | object.data["announcements"] || []] |> Enum.uniq() do
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update_element_in_object("announcement", announcements, object)
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end
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end
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#### Unfollow-related helpers
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def make_unfollow_data(follower, followed, follow_activity) do
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%{
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"type" => "Undo",
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"actor" => follower.ap_id,
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"to" => [followed.ap_id],
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"object" => follow_activity.data["id"]
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}
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end
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#### Create-related helpers
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def make_create_data(params, additional) do
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published = params.published || make_date()
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%{
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"type" => "Create",
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"to" => params.to |> Enum.uniq(),
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"actor" => params.actor.ap_id,
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"object" => params.object,
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"published" => published,
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"context" => params.context
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}
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|> Map.merge(additional)
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end
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end
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