151 lines
4.3 KiB
Elixir
151 lines
4.3 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.Web.ActivityPub.ActivityPub
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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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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 %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: data["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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_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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%Object{} = object <- Object.get_by_ap_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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# 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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@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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|> add_mention_tags
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|> add_attributed_to
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|> prepare_attachments
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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) when type in ["Follow", "Accept", "Like", "Announce"] 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_mention_tags(object) do
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mentions = object["to"]
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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 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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end
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