mirror of
https://akkoma.dev/AkkomaGang/akkoma.git
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224 lines
6.3 KiB
Elixir
224 lines
6.3 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.User.Search do
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alias Pleroma.Pagination
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alias Pleroma.Repo
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alias Pleroma.User
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import Ecto.Query
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@similarity_threshold 0.25
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@limit 20
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def search(query_string, opts \\ []) do
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resolve = Keyword.get(opts, :resolve, false)
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following = Keyword.get(opts, :following, false)
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result_limit = Keyword.get(opts, :limit, @limit)
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offset = Keyword.get(opts, :offset, 0)
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for_user = Keyword.get(opts, :for_user)
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query_string = format_query(query_string)
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maybe_resolve(resolve, for_user, query_string)
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{:ok, results} =
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Repo.transaction(fn ->
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Ecto.Adapters.SQL.query(
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Repo,
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"select set_limit(#{@similarity_threshold})",
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[]
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)
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query_string
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|> search_query(for_user, following)
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|> Pagination.fetch_paginated(%{"offset" => offset, "limit" => result_limit}, :offset)
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end)
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results
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end
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defp format_query(query_string) do
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# Strip the beginning @ off if there is a query
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query_string = String.trim_leading(query_string, "@")
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with [name, domain] <- String.split(query_string, "@"),
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formatted_domain <- String.replace(domain, ~r/[!-\-|@|[-`|{-~|\/|:|\s]+/, "") do
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name <> "@" <> to_string(:idna.encode(formatted_domain))
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else
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_ -> query_string
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end
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end
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defp search_query(query_string, for_user, following) do
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for_user
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|> base_query(following)
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|> filter_blocked_user(for_user)
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|> filter_blocked_domains(for_user)
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|> search_subqueries(query_string)
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|> union_subqueries
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|> distinct_query()
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|> boost_search_rank_query(for_user)
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|> subquery()
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|> order_by(desc: :search_rank)
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|> maybe_restrict_local(for_user)
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end
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defp base_query(_user, false), do: User
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defp base_query(user, true), do: User.get_followers_query(user)
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defp filter_blocked_user(query, %User{info: %{blocks: blocks}})
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when length(blocks) > 0 do
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from(q in query, where: not (q.ap_id in ^blocks))
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end
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defp filter_blocked_user(query, _), do: query
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defp filter_blocked_domains(query, %User{info: %{domain_blocks: domain_blocks}})
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when length(domain_blocks) > 0 do
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domains = Enum.join(domain_blocks, ",")
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from(
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q in query,
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where: fragment("substring(ap_id from '.*://([^/]*)') NOT IN (?)", ^domains)
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)
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end
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defp filter_blocked_domains(query, _), do: query
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defp union_subqueries({fts_subquery, trigram_subquery}) do
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from(s in trigram_subquery, union_all: ^fts_subquery)
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end
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defp search_subqueries(base_query, query_string) do
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{
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fts_search_subquery(base_query, query_string),
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trigram_search_subquery(base_query, query_string)
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}
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end
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defp distinct_query(q) do
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from(s in subquery(q), order_by: s.search_type, distinct: s.id)
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end
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defp maybe_resolve(true, user, query) do
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case {limit(), user} do
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{:all, _} -> :noop
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{:unauthenticated, %User{}} -> User.get_or_fetch(query)
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{:unauthenticated, _} -> :noop
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{false, _} -> User.get_or_fetch(query)
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end
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end
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defp maybe_resolve(_, _, _), do: :noop
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defp maybe_restrict_local(q, user) do
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case {limit(), user} do
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{:all, _} -> restrict_local(q)
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{:unauthenticated, %User{}} -> q
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{:unauthenticated, _} -> restrict_local(q)
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{false, _} -> q
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end
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end
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defp limit, do: Pleroma.Config.get([:instance, :limit_to_local_content], :unauthenticated)
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defp restrict_local(q), do: where(q, [u], u.local == true)
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defp boost_search_rank_query(query, nil), do: query
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defp boost_search_rank_query(query, for_user) do
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friends_ids = User.get_friends_ids(for_user)
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followers_ids = User.get_followers_ids(for_user)
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from(u in subquery(query),
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select_merge: %{
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search_rank:
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fragment(
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"""
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CASE WHEN (?) THEN 0.5 + (?) * 1.3
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WHEN (?) THEN 0.5 + (?) * 1.2
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WHEN (?) THEN (?) * 1.1
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ELSE (?) END
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""",
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u.id in ^friends_ids and u.id in ^followers_ids,
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u.search_rank,
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u.id in ^friends_ids,
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u.search_rank,
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u.id in ^followers_ids,
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u.search_rank,
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u.search_rank
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)
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}
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)
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end
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@spec fts_search_subquery(User.t() | Ecto.Query.t(), String.t()) :: Ecto.Query.t()
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defp fts_search_subquery(query, term) do
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processed_query =
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String.trim_trailing(term, "@" <> local_domain())
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|> String.replace(~r/[!-\/|@|[-`|{-~|:-?]+/, " ")
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|> String.trim()
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|> String.split()
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|> Enum.map(&(&1 <> ":*"))
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|> Enum.join(" | ")
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from(
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u in query,
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select_merge: %{
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search_type: ^0,
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search_rank:
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fragment(
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"""
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ts_rank_cd(
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setweight(to_tsvector('simple', regexp_replace(?, '\\W', ' ', 'g')), 'A') ||
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setweight(to_tsvector('simple', regexp_replace(coalesce(?, ''), '\\W', ' ', 'g')), 'B'),
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to_tsquery('simple', ?),
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32
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)
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""",
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u.nickname,
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u.name,
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^processed_query
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)
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},
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where:
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fragment(
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"""
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(setweight(to_tsvector('simple', regexp_replace(?, '\\W', ' ', 'g')), 'A') ||
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setweight(to_tsvector('simple', regexp_replace(coalesce(?, ''), '\\W', ' ', 'g')), 'B')) @@ to_tsquery('simple', ?)
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""",
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u.nickname,
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u.name,
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^processed_query
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)
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)
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|> User.restrict_deactivated()
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end
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@spec trigram_search_subquery(User.t() | Ecto.Query.t(), String.t()) :: Ecto.Query.t()
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defp trigram_search_subquery(query, term) do
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term = String.trim_trailing(term, "@" <> local_domain())
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from(
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u in query,
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select_merge: %{
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# ^1 gives 'Postgrex expected a binary, got 1' for some weird reason
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search_type: fragment("?", 1),
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search_rank:
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fragment(
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"similarity(?, trim(? || ' ' || coalesce(?, '')))",
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^term,
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u.nickname,
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u.name
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)
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},
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where: fragment("trim(? || ' ' || coalesce(?, '')) % ?", u.nickname, u.name, ^term)
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)
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|> User.restrict_deactivated()
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end
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defp local_domain, do: Pleroma.Config.get([Pleroma.Web.Endpoint, :url, :host])
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end
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