1 # Pleroma: A lightweight social networking server
2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
3 # SPDX-License-Identifier: AGPL-3.0-only
5 defmodule Pleroma.User.Search do
10 def search(query, opts \\ []) do
11 resolve = Keyword.get(opts, :resolve, false)
12 for_user = Keyword.get(opts, :for_user)
14 # Strip the beginning @ off if there is a query
15 query = String.trim_leading(query, "@")
17 maybe_resolve(resolve, for_user, query)
20 Repo.transaction(fn ->
21 Ecto.Adapters.SQL.query(Repo, "select set_limit(0.25)", [])
24 |> search_query(for_user)
31 defp search_query(query, for_user) do
35 |> boost_search_rank_query(for_user)
37 |> order_by(desc: :search_rank)
39 |> maybe_restrict_local(for_user)
42 defp union_query(query) do
43 fts_subquery = fts_search_subquery(query)
44 trigram_subquery = trigram_search_subquery(query)
46 from(s in trigram_subquery, union_all: ^fts_subquery)
49 defp distinct_query(q) do
50 from(s in subquery(q), order_by: s.search_type, distinct: s.id)
53 defp maybe_resolve(true, user, query) do
54 case {limit(), user} do
56 {:unauthenticated, %User{}} -> User.get_or_fetch(query)
57 {:unauthenticated, _} -> :noop
58 {false, _} -> User.get_or_fetch(query)
62 defp maybe_resolve(_, _, _), do: :noop
64 defp maybe_restrict_local(q, user) do
65 case {limit(), user} do
66 {:all, _} -> restrict_local(q)
67 {:unauthenticated, %User{}} -> q
68 {:unauthenticated, _} -> restrict_local(q)
73 defp limit, do: Pleroma.Config.get([:instance, :limit_to_local_content], :unauthenticated)
75 defp restrict_local(q), do: where(q, [u], u.local == true)
77 defp boost_search_rank_query(query, nil), do: query
79 defp boost_search_rank_query(query, for_user) do
80 friends_ids = User.get_friends_ids(for_user)
81 followers_ids = User.get_followers_ids(for_user)
83 from(u in subquery(query),
88 CASE WHEN (?) THEN 0.5 + (?) * 1.3
89 WHEN (?) THEN 0.5 + (?) * 1.2
90 WHEN (?) THEN (?) * 1.1
93 u.id in ^friends_ids and u.id in ^followers_ids,
97 u.id in ^followers_ids,
105 defp fts_search_subquery(term, query \\ User) do
108 |> String.replace(~r/\W+/, " ")
111 |> Enum.map(&(&1 <> ":*"))
122 setweight(to_tsvector('simple', regexp_replace(?, '\\W', ' ', 'g')), 'A') ||
123 setweight(to_tsvector('simple', regexp_replace(coalesce(?, ''), '\\W', ' ', 'g')), 'B'),
124 to_tsquery('simple', ?),
136 (setweight(to_tsvector('simple', regexp_replace(?, '\\W', ' ', 'g')), 'A') ||
137 setweight(to_tsvector('simple', regexp_replace(coalesce(?, ''), '\\W', ' ', 'g')), 'B')) @@ to_tsquery('simple', ?)
144 |> User.restrict_deactivated()
147 defp trigram_search_subquery(term) do
151 # ^1 gives 'Postgrex expected a binary, got 1' for some weird reason
152 search_type: fragment("?", 1),
155 "similarity(?, trim(? || ' ' || coalesce(?, '')))",
161 where: fragment("trim(? || ' ' || coalesce(?, '')) % ?", u.nickname, u.name, ^term)
163 |> User.restrict_deactivated()