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|
# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Filter do
use Ecto.Schema
import Ecto.Changeset
import Ecto.Query
alias Pleroma.Repo
alias Pleroma.User
schema "filters" do
belongs_to(:user, User, type: FlakeId.Ecto.CompatType)
field(:filter_id, :integer)
field(:hide, :boolean, default: false)
field(:whole_word, :boolean, default: true)
field(:phrase, :string)
field(:context, {:array, :string})
field(:expires_at, :utc_datetime)
timestamps()
end
def get(id, %{id: user_id} = _user) do
query =
from(
f in Pleroma.Filter,
where: f.filter_id == ^id,
where: f.user_id == ^user_id
)
Repo.one(query)
end
def get_active(query) do
from(f in query, where: is_nil(f.expires_at) or f.expires_at > ^NaiveDateTime.utc_now())
end
def get_irreversible(query) do
from(f in query, where: f.hide)
end
def get_filters(query \\ __MODULE__, %User{id: user_id}) do
query =
from(
f in query,
where: f.user_id == ^user_id,
order_by: [desc: :id]
)
Repo.all(query)
end
def create(%Pleroma.Filter{user_id: user_id, filter_id: nil} = filter) do
# If filter_id wasn't given, use the max filter_id for this user plus 1.
# XXX This could result in a race condition if a user tries to add two
# different filters for their account from two different clients at the
# same time, but that should be unlikely.
max_id_query =
from(
f in Pleroma.Filter,
where: f.user_id == ^user_id,
select: max(f.filter_id)
)
filter_id =
case Repo.one(max_id_query) do
# Start allocating from 1
nil ->
1
max_id ->
max_id + 1
end
filter
|> Map.put(:filter_id, filter_id)
|> Repo.insert()
end
def create(%Pleroma.Filter{} = filter) do
Repo.insert(filter)
end
def delete(%Pleroma.Filter{id: filter_key} = filter) when is_number(filter_key) do
Repo.delete(filter)
end
def delete(%Pleroma.Filter{id: filter_key} = filter) when is_nil(filter_key) do
%Pleroma.Filter{id: id} = get(filter.filter_id, %{id: filter.user_id})
filter
|> Map.put(:id, id)
|> Repo.delete()
end
def update(%Pleroma.Filter{} = filter, params) do
filter
|> cast(params, [:phrase, :context, :hide, :expires_at, :whole_word])
|> validate_required([:phrase, :context])
|> Repo.update()
end
def compose_regex(user_or_filters, format \\ :postgres)
def compose_regex(%User{} = user, format) do
__MODULE__
|> get_active()
|> get_irreversible()
|> get_filters(user)
|> compose_regex(format)
end
def compose_regex([_ | _] = filters, format) do
phrases =
filters
|> Enum.map(& &1.phrase)
|> Enum.join("|")
case format do
:postgres ->
"\\y(#{phrases})\\y"
:re ->
~r/\b#{phrases}\b/i
_ ->
nil
end
end
def compose_regex(_, _), do: nil
end
|
