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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.Search.DatabaseSearch do
alias Pleroma.Activity
alias Pleroma.Config
alias Pleroma.Object.Fetcher
alias Pleroma.Pagination
alias Pleroma.User
alias Pleroma.Web.ActivityPub.Visibility
require Pleroma.Constants
import Ecto.Query
@behaviour Pleroma.Search.SearchBackend
@impl true
def search(user, search_query, options \\ []) do
index_type = if Config.get([:database, :rum_enabled]), do: :rum, else: :gin
limit = Enum.min([Keyword.get(options, :limit), 40])
offset = Keyword.get(options, :offset, 0)
author = Keyword.get(options, :author)
try do
Activity
|> Activity.with_preloaded_object()
|> Activity.restrict_deactivated_users()
|> restrict_public(user)
|> query_with(index_type, search_query)
|> maybe_restrict_local(user)
|> maybe_restrict_author(author)
|> maybe_restrict_blocked(user)
|> Pagination.fetch_paginated(
%{"offset" => offset, "limit" => limit, "skip_order" => index_type == :rum},
:offset
)
|> maybe_fetch(user, search_query)
rescue
_ -> maybe_fetch([], user, search_query)
end
end
@impl true
def add_to_index(_activity), do: :ok
@impl true
def remove_from_index(_object), do: :ok
@impl true
def create_index, do: :ok
@impl true
def drop_index, do: :ok
@impl true
def healthcheck_endpoints, do: nil
def maybe_restrict_author(query, %User{} = author) do
Activity.Queries.by_author(query, author)
end
def maybe_restrict_author(query, _), do: query
def maybe_restrict_blocked(query, %User{} = user) do
Activity.Queries.exclude_authors(query, User.blocked_users_ap_ids(user))
end
def maybe_restrict_blocked(query, _), do: query
defp restrict_public(q, user) when not is_nil(user) do
intended_recipients = [
Pleroma.Constants.as_public(),
Pleroma.Web.ActivityPub.Utils.as_local_public()
]
from([a, o] in q,
where: fragment("?->>'type' = 'Create'", a.data),
where: fragment("? && ?", ^intended_recipients, a.recipients)
)
end
defp restrict_public(q, _user) do
from([a, o] in q,
where: fragment("?->>'type' = 'Create'", a.data),
where: ^Pleroma.Constants.as_public() in a.recipients
)
end
defp query_with(q, :gin, search_query) do
%{rows: [[tsc]]} =
Ecto.Adapters.SQL.query!(
Pleroma.Repo,
"select current_setting('default_text_search_config')::regconfig::oid;"
)
from([a, o] in q,
where:
fragment(
"to_tsvector(?::oid::regconfig, ?->>'content') @@ websearch_to_tsquery(?)",
^tsc,
o.data,
^search_query
),
order_by: [desc: :inserted_at]
)
end
defp query_with(q, :rum, search_query) do
from([a, o] in q,
where:
fragment(
"? @@ websearch_to_tsquery(?)",
o.fts_content,
^search_query
),
order_by: [fragment("? <=> now()::date", o.inserted_at)]
)
end
def maybe_restrict_local(q, user) do
limit = Config.get([:instance, :limit_to_local_content], :unauthenticated)
case {limit, user} do
{:all, _} -> restrict_local(q)
{:unauthenticated, %User{}} -> q
{:unauthenticated, _} -> restrict_local(q)
{false, _} -> q
end
end
defp restrict_local(q), do: where(q, local: true)
def maybe_fetch(activities, user, search_query) do
with true <- Regex.match?(~r/https?:/, search_query),
{:ok, object} <- Fetcher.fetch_object_from_id(search_query),
%Activity{} = activity <- Activity.get_create_by_object_ap_id(object.data["id"]),
true <- Visibility.visible_for_user?(activity, user) do
[activity | activities]
else
_ -> activities
end
end
end

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