dont use S3 directly allow to use any document url (document service agnostic)

lib/provider_service_web/query_helpers.ex

@@ -0,0 +1,34 @@
+defmodule ProviderServiceWeb.QueryHelpers do
+  @moduledoc false
+
+  alias OpenApiSpex.Schema
+
+  @filter_count 3
+
+  def flop(filter_fields, order_fields, other \\ []) do
+    [
+      page: [in: :query, schema: %Schema{type: :number, default: 1}],
+      page_size: [in: :query, schema: %Schema{type: :number, default: 20}],
+      order_by: [
+        in: :query,
+        schema: %Schema{type: :array, items: %Schema{type: :string, enum: order_fields}}
+      ],
+      order_directions: [
+        in: :query,
+        schema: %Schema{type: :array, items: %Schema{type: :string, enum: ["asc", "desc"]}}
+      ]
+    ] ++ build_filter_params(filter_fields) ++ other
+  end
+
+  defp build_filter_params(fields) do
+    for i <- 0..(@filter_count - 1) do
+      [
+        {:"filters[#{i}][field]", [in: :query, schema: %Schema{type: :string, enum: fields}]},
+        {:"filters[#{i}][op]",
+         [in: :query, schema: %Schema{type: :string, enum: Flop.Filter.allowed_operators(:all)}]},
+        {:"filters[#{i}][value]", [in: :query, schema: %Schema{type: :string}]}
+      ]
+    end
+    |> List.flatten()
+  end
+end