fix: Set min query length in the search API endpoints (#10698)

apps/block_scout_web/lib/block_scout_web/controllers/api/v2/search_controller.ex

@@ -8,6 +8,16 @@ defmodule BlockScoutWeb.API.V2.SearchController do
   alias Explorer.PagingOptions
 
   @api_true [api?: true]
+  @min_query_length 3
+
+  def search(conn, %{"q" => query}) when byte_size(query) < @min_query_length do
+    conn
+    |> put_status(200)
+    |> render(:search_results, %{
+      search_results: [],
+      next_page_params: nil
+    })
+  end
 
   def search(conn, %{"q" => query} = params) do
     [paging_options: paging_options] = paging_options(params)
@@ -29,6 +39,12 @@ defmodule BlockScoutWeb.API.V2.SearchController do
     })
   end
 
+  def check_redirect(conn, %{"q" => query}) when byte_size(query) < @min_query_length do
+    conn
+    |> put_status(200)
+    |> render(:search_results, %{result: {:error, :not_found}})
+  end
+
   def check_redirect(conn, %{"q" => query}) do
     result =
       query
@@ -40,6 +56,12 @@ defmodule BlockScoutWeb.API.V2.SearchController do
     |> render(:search_results, %{result: result})
   end
 
+  def quick_search(conn, %{"q" => query}) when byte_size(query) < @min_query_length do
+    conn
+    |> put_status(200)
+    |> render(:search_results, %{search_results: []})
+  end
+
   def quick_search(conn, %{"q" => query}) do
     search_results = Search.balanced_unpaginated_search(%PagingOptions{page_size: 50}, query, @api_true)
 

apps/block_scout_web/lib/block_scout_web/controllers/search_controller.ex

@@ -7,6 +7,18 @@ defmodule BlockScoutWeb.SearchController do
   alias Explorer.Chain.Search
   alias Phoenix.View
 
+  @min_query_length 3
+
+  def search_results(conn, %{"q" => query, "type" => "JSON"}) when byte_size(query) < @min_query_length do
+    json(
+      conn,
+      %{
+        items: [],
+        next_page_path: nil
+      }
+    )
+  end
+
   def search_results(conn, %{"q" => query, "type" => "JSON"} = params) do
     [paging_options: paging_options] = paging_options(params)
     offset = (max(paging_options.page_number, 1) - 1) * paging_options.page_size