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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Chat do
   6   use Ecto.Schema
   7   import Ecto.Changeset
   8
   9   alias Pleroma.Repo
  10   alias Pleroma.User
  11
  12   @moduledoc """
  13   Chat keeps a reference to ChatMessage conversations between a user and an recipient. The recipient can be a user (for now) or a group (not implemented yet).
  14
  15   It is a helper only, to make it easy to display a list of chats with other people, ordered by last bump. The actual messages are retrieved by querying the recipients of the ChatMessages.
  16   """
  17
  18   schema "chats" do
  19     belongs_to(:user, User, type: FlakeId.Ecto.CompatType)
  20     field(:recipient, :string)
  21     field(:unread, :integer, default: 0, read_after_writes: true)
  22
  23     timestamps()
  24   end
  25
  26   def creation_cng(struct, params) do
  27     struct
  28     |> cast(params, [:user_id, :recipient, :unread])
  29     |> validate_change(:recipient, fn
  30       :recipient, recipient ->
  31         case User.get_cached_by_ap_id(recipient) do
  32           nil -> [recipient: "must a an existing user"]
  33           _ -> []
  34         end
  35     end)
  36     |> validate_required([:user_id, :recipient])
  37     |> unique_constraint(:user_id, name: :chats_user_id_recipient_index)
  38   end
  39
  40   def get(user_id, recipient) do
  41     __MODULE__
  42     |> Repo.get_by(user_id: user_id, recipient: recipient)
  43   end
  44
  45   def get_or_create(user_id, recipient) do
  46     %__MODULE__{}
  47     |> creation_cng(%{user_id: user_id, recipient: recipient})
  48     |> Repo.insert(
  49       on_conflict: :nothing,
  50       returning: true,
  51       conflict_target: [:user_id, :recipient]
  52     )
  53   end
  54
  55   def bump_or_create(user_id, recipient) do
  56     %__MODULE__{}
  57     |> creation_cng(%{user_id: user_id, recipient: recipient, unread: 1})
  58     |> Repo.insert(
  59       on_conflict: [set: [updated_at: NaiveDateTime.utc_now()], inc: [unread: 1]],
  60       conflict_target: [:user_id, :recipient]
  61     )
  62   end
  63 end