Resolve conflicts

lib/pleroma/user/search.ex

@@ -7,74 +7,97 @@ defmodule Pleroma.User.Search do
   alias Pleroma.User
   import Ecto.Query
 
-  def search(query, opts \\ []) do
+  @similarity_threshold 0.25
+  @limit 20
+
+  def search(query_string, opts \\ []) do
     resolve = Keyword.get(opts, :resolve, false)
+    following = Keyword.get(opts, :following, false)
+    result_limit = Keyword.get(opts, :limit, @limit)
+    offset = Keyword.get(opts, :offset, 0)
+
     for_user = Keyword.get(opts, :for_user)
 
     # Strip the beginning @ off if there is a query
-    query = String.trim_leading(query, "@")
+    query_string = String.trim_leading(query_string, "@")
 
-    maybe_resolve(resolve, for_user, query)
+    maybe_resolve(resolve, for_user, query_string)
 
     {:ok, results} =
       Repo.transaction(fn ->
-        Ecto.Adapters.SQL.query(Repo, "select set_limit(0.25)", [])
+        Ecto.Adapters.SQL.query(
+          Repo,
+          "select set_limit(#{@similarity_threshold})",
+          []
+        )
 
-        query
-        |> search_query(for_user)
+        query_string
+        |> search_query(for_user, following)
+        |> paginate(result_limit, offset)
         |> Repo.all()
       end)
 
     results
   end
 
-  defp maybe_resolve(true, %User{}, query) do
-    User.get_or_fetch(query)
-  end
-
-  defp maybe_resolve(true, _, query) do
-    unless restrict_local?(), do: User.get_or_fetch(query)
-  end
-
-  defp maybe_resolve(_, _, _), do: :noop
-
-  defp search_query(query, for_user) do
-    query
-    |> union_query()
+  defp search_query(query_string, for_user, following) do
+    for_user
+    |> base_query(following)
+    |> search_subqueries(query_string)
+    |> union_subqueries
     |> distinct_query()
     |> boost_search_rank_query(for_user)
     |> subquery()
     |> order_by(desc: :search_rank)
-    |> limit(20)
     |> maybe_restrict_local(for_user)
   end
 
-  defp restrict_local? do
-    Pleroma.Config.get([:instance, :limit_unauthenticated_to_local_content], true)
+  defp base_query(_user, false), do: User
+  defp base_query(user, true), do: User.get_followers_query(user)
+
+  defp paginate(query, limit, offset) do
+    from(q in query, limit: ^limit, offset: ^offset)
   end
 
-  defp union_query(query) do
-    fts_subquery = fts_search_subquery(query)
-    trigram_subquery = trigram_search_subquery(query)
-
+  defp union_subqueries({fts_subquery, trigram_subquery}) do
     from(s in trigram_subquery, union_all: ^fts_subquery)
   end
 
+  defp search_subqueries(base_query, query_string) do
+    {
+      fts_search_subquery(base_query, query_string),
+      trigram_search_subquery(base_query, query_string)
+    }
+  end
+
   defp distinct_query(q) do
     from(s in subquery(q), order_by: s.search_type, distinct: s.id)
   end
 
-  # unauthenticated users can only search local activities
-  defp maybe_restrict_local(q, %User{}), do: q
-
-  defp maybe_restrict_local(q, _) do
-    if restrict_local?() do
-      where(q, [u], u.local == true)
-    else
-      q
+  defp maybe_resolve(true, user, query) do
+    case {limit(), user} do
+      {:all, _} -> :noop
+      {:unauthenticated, %User{}} -> User.get_or_fetch(query)
+      {:unauthenticated, _} -> :noop
+      {false, _} -> User.get_or_fetch(query)
     end
   end
 
+  defp maybe_resolve(_, _, _), do: :noop
+
+  defp maybe_restrict_local(q, user) do
+    case {limit(), user} do
+      {:all, _} -> restrict_local(q)
+      {:unauthenticated, %User{}} -> q
+      {:unauthenticated, _} -> restrict_local(q)
+      {false, _} -> q
+    end
+  end
+
+  defp limit, do: Pleroma.Config.get([:instance, :limit_to_local_content], :unauthenticated)
+
+  defp restrict_local(q), do: where(q, [u], u.local == true)
+
   defp boost_search_rank_query(query, nil), do: query
 
   defp boost_search_rank_query(query, for_user) do
@@ -103,7 +126,8 @@ defmodule Pleroma.User.Search do
     )
   end
 
-  defp fts_search_subquery(term, query \\ User) do
+  @spec fts_search_subquery(User.t() | Ecto.Query.t(), String.t()) :: Ecto.Query.t()
+  defp fts_search_subquery(query, term) do
     processed_query =
       term
       |> String.replace(~r/\W+/, " ")
@@ -145,9 +169,10 @@ defmodule Pleroma.User.Search do
     |> User.restrict_deactivated()
   end
 
-  defp trigram_search_subquery(term) do
+  @spec trigram_search_subquery(User.t() | Ecto.Query.t(), String.t()) :: Ecto.Query.t()
+  defp trigram_search_subquery(query, term) do
     from(
-      u in User,
+      u in query,
       select_merge: %{
         # ^1 gives 'Postgrex expected a binary, got 1' for some weird reason
         search_type: fragment("?", 1),