285 lines
8 KiB
Elixir
285 lines
8 KiB
Elixir
defmodule Pleroma.Web.ActivityPub.ActivityPub do
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alias Pleroma.{Activity, Repo, Object, Upload, User, Web}
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alias Ecto.{Changeset, UUID}
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import Ecto.Query
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require Logger
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def insert(map, local \\ true) when is_map(map) do
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map = 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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with %Activity{} = activity <- Activity.get_by_ap_id(map["id"]) do
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Logger.debug(fn -> "Already have activity, #{activity.id}, not inserting." end)
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{:ok, activity}
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else _e ->
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map = if is_map(map["object"]) do
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object = Map.put_new_lazy(map["object"], "id", &generate_object_id/0)
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Repo.insert!(%Object{data: object})
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Map.put(map, "object", object)
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else
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map
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end
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Repo.insert(%Activity{data: map, local: local})
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end
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end
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def create(to, actor, context, object, additional \\ %{}, published \\ nil, local \\ true) do
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published = published || make_date()
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activity = %{
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"type" => "Create",
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"to" => to |> Enum.uniq,
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"actor" => actor.ap_id,
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"object" => object,
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"published" => published,
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"context" => context
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}
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|> Map.merge(additional)
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with {:ok, activity} <- insert(activity, local) do
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if actor.local do
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Pleroma.Web.Federator.enqueue(:publish, activity)
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end
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{:ok, activity}
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end
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end
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def like(%User{ap_id: ap_id} = user, %Object{data: %{"id" => id}} = object, activity_id \\ nil, local \\ true) do
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cond do
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# There's already a like here, so return the original activity.
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ap_id in (object.data["likes"] || []) ->
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query = from activity in Activity,
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where: fragment("? @> ?", activity.data, ^%{actor: ap_id, object: id, type: "Like"})
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activity = Repo.one(query)
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{:ok, activity, object}
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true ->
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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" => [User.ap_followers(user), object.data["actor"]],
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"context" => object.data["context"]
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}
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data = if activity_id, do: Map.put(data, "id", activity_id), else: data
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{:ok, activity} = insert(data, local)
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likes = [ap_id | (object.data["likes"] || [])] |> Enum.uniq
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new_data = object.data
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|> Map.put("like_count", length(likes))
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|> Map.put("likes", likes)
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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)
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if user.local do
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Pleroma.Web.Federator.enqueue(:publish, activity)
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end
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{:ok, activity, object}
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end
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end
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defp 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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def unlike(%User{ap_id: ap_id}, %Object{data: %{ "id" => id}} = object) do
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query = from activity in Activity,
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where: fragment("? @> ?", activity.data, ^%{actor: ap_id, object: id, type: "Like"})
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activity = Repo.one(query)
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if activity do
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# just delete for now...
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{:ok, _activity} = Repo.delete(activity)
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likes = (object.data["likes"] || []) |> List.delete(ap_id)
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new_data = object.data
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|> Map.put("like_count", length(likes))
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|> Map.put("likes", likes)
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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)
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{:ok, object}
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else
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{:ok, object}
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end
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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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Pleroma.Web.Router.Helpers.o_status_url(Pleroma.Web.Endpoint, :object, Ecto.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 fetch_public_activities(opts \\ %{}) do
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public = ["https://www.w3.org/ns/activitystreams#Public"]
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fetch_activities(public, opts)
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end
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def fetch_activities(recipients, opts \\ %{}) do
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since_id = opts["since_id"] || 0
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query = from activity in Activity,
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limit: 20,
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order_by: [desc: :inserted_at]
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query = Enum.reduce(recipients, query, fn (recipient, q) ->
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map = %{ to: [recipient] }
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from activity in q,
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or_where: fragment(~s(? @> ?), activity.data, ^map)
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end)
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query = from activity in query,
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where: activity.id > ^since_id
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query = if opts["local_only"] do
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from activity in query, where: activity.local == true
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else
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query
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end
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query = if opts["max_id"] do
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from activity in query, where: activity.id < ^opts["max_id"]
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else
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query
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end
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query = if opts["actor_id"] do
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from activity in query,
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where: fragment("? @> ?", activity.data, ^%{actor: opts["actor_id"]})
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else
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query
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end
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Enum.reverse(Repo.all(query))
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end
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def announce(%User{ap_id: ap_id} = user, %Object{data: %{"id" => id}} = object, activity_id \\ nil, local \\ true) 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.ap_followers(user), object.data["actor"]],
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"context" => object.data["context"]
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}
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data = if activity_id, do: Map.put(data, "id", activity_id), else: data
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{:ok, activity} = insert(data, local)
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announcements = [ap_id | (object.data["announcements"] || [])] |> Enum.uniq
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new_data = object.data
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|> Map.put("announcement_count", length(announcements))
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|> Map.put("announcements", announcements)
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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)
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if user.local do
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Pleroma.Web.Federator.enqueue(:publish, activity)
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end
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{:ok, activity, object}
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end
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def follow(%User{ap_id: follower_id, local: actor_local}, %User{ap_id: followed_id}, activity_id \\ nil, local \\ true) 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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"object" => followed_id,
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"published" => make_date()
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}
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data = if activity_id, do: Map.put(data, "id", activity_id), else: data
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with {:ok, activity} <- insert(data, local) do
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if actor_local do
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Pleroma.Web.Federator.enqueue(:publish, activity)
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end
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{:ok, activity}
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end
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end
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def unfollow(follower, followed, local \\ true) do
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with follow_activity when not is_nil(follow_activity) <- fetch_latest_follow(follower, followed) do
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data = %{
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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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"published" => make_date()
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}
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with {:ok, activity} <- insert(data, local) do
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if follower.local do
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Pleroma.Web.Federator.enqueue(:publish, activity)
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end
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{:ok, activity}
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end
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end
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end
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def fetch_activities_for_context(context) do
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query = from activity in Activity,
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where: fragment("? @> ?", activity.data, ^%{ context: context })
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Repo.all(query)
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end
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def fetch_latest_follow(%User{ap_id: follower_id},
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%User{ap_id: followed_id}) do
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query = from activity in Activity,
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where: fragment("? @> ?", activity.data, ^%{type: "Follow", actor: follower_id,
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object: followed_id}),
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order_by: [desc: :inserted_at],
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limit: 1
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Repo.one(query)
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end
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def upload(file) do
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data = Upload.store(file)
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Repo.insert(%Object{data: data})
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end
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defp make_date do
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DateTime.utc_now() |> DateTime.to_iso8601
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end
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end
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