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# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Push.Subscription do
use Ecto.Schema
import Ecto.Changeset
alias Pleroma.Repo
alias Pleroma.User
alias Pleroma.Web.OAuth.Token
alias Pleroma.Web.Push.Subscription
@type t :: %__MODULE__{}
schema "push_subscriptions" do
belongs_to(:user, User, type: FlakeId.Ecto.CompatType)
belongs_to(:token, Token)
field(:endpoint, :string)
field(:key_p256dh, :string)
field(:key_auth, :string)
field(:data, :map, default: %{})
timestamps()
end
@supported_alert_types ~w[follow favourite mention reblog]
defp alerts(%{"data" => %{"alerts" => alerts}}) do
alerts = Map.take(alerts, @supported_alert_types)
%{"alerts" => alerts}
end
def create(
%User{} = user,
%Token{} = token,
%{
"subscription" => %{
"endpoint" => endpoint,
"keys" => %{"auth" => key_auth, "p256dh" => key_p256dh}
}
} = params
) do
Repo.insert(%Subscription{
user_id: user.id,
token_id: token.id,
endpoint: endpoint,
key_auth: ensure_base64_urlsafe(key_auth),
key_p256dh: ensure_base64_urlsafe(key_p256dh),
data: alerts(params)
})
end
@doc "Gets subsciption by user & token"
@spec get(User.t(), Token.t()) :: {:ok, t()} | {:error, :not_found}
def get(%User{id: user_id}, %Token{id: token_id}) do
case Repo.get_by(Subscription, user_id: user_id, token_id: token_id) do
nil -> {:error, :not_found}
subscription -> {:ok, subscription}
end
end
def update(user, token, params) do
with {:ok, subscription} <- get(user, token) do
subscription
|> change(data: alerts(params))
|> Repo.update()
end
end
def delete(user, token) do
with {:ok, subscription} <- get(user, token),
do: Repo.delete(subscription)
end
def delete_if_exists(user, token) do
case get(user, token) do
{:error, _} -> {:ok, nil}
{:ok, sub} -> Repo.delete(sub)
end
end
# Some webpush clients (e.g. iOS Toot!) use an non urlsafe base64 as an encoding for the key.
# However, the web push rfs specify to use base64 urlsafe, and the `web_push_encryption` library
# we use requires the key to be properly encoded. So we just convert base64 to urlsafe base64.
defp ensure_base64_urlsafe(string) do
string
|> String.replace("+", "-")
|> String.replace("/", "_")
|> String.replace("=", "")
end
end
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