A small ActivityPub server.
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defmodule Clacks.ActivityPub do
@context ["https://www.w3.org/ns/activitystreams"]
@public "https://www.w3.org/ns/activitystreams#Public"
@spec note(
actor :: String.t(),
html :: String.t(),
context :: String.t(),
id :: String.t() | nil,
published :: DateTime.t(),
to :: [String.t()],
cc :: [String.t()]
) :: map()
def note(
actor,
html,
context,
id \\ nil,
published \\ DateTime.utc_now(),
to \\ [@public],
cc \\ []
) do
id = id || object_id(Ecto.UUID.generate())
%{
"@context" => @context,
"id" => id,
"url" => id,
"type" => "Note",
"actor" => actor,
"attributedTo" => actor,
"to" => to,
"cc" => cc,
"content" => html,
"conversation" => context,
"context" => context,
"published" => published |> DateTime.to_iso8601()
}
end
@spec create(
object :: map(),
id :: String.t() | nil,
actor :: String.t() | nil,
to :: [String.t()] | nil,
cc :: [String.t()] | nil
) :: map()
def create(object, id \\ nil, actor \\ nil, to \\ nil, cc \\ nil) do
%{
"@context" => @context,
"id" => id || activity_id(Ecto.UUID.generate()),
"actor" => actor || object["actor"],
"type" => "Create",
"object" => object,
"to" => to || object["to"],
"cc" => cc || object["cc"]
}
end
@spec synthesized_create(object :: map()) :: map()
def synthesized_create(object) do
%{
"@context" => @context,
"type" => "Create",
"object" => object,
# Mastodon doesn't include 'actor' in notes
"actor" => object["actor"] || object["attributedTo"],
"to" => object["to"],
"cc" => object["cc"]
}
end
@spec object_id(id :: String.t()) :: String.t()
def object_id(id) do
url = Application.get_env(:clacks, ClacksWeb.Endpoint)[:url]
%URI{
scheme: url[:scheme],
host: url[:host],
port: url[:port],
path: Path.join("/objects", id)
}
|> URI.to_string()
end
@spec activity_id(id :: String.t()) :: String.t()
def activity_id(id) do
url = Application.get_env(:clacks, ClacksWeb.Endpoint)[:url]
%URI{
scheme: url[:scheme],
host: url[:host],
port: url[:port],
path: Path.join("/activities", id)
}
|> URI.to_string()
end
end