set /configuration client body size dynamically

internal/ingress/controller/template/template.go

@@ -136,6 +136,7 @@ var (
 		"escapeLiteralDollar":             escapeLiteralDollar,
 		"shouldConfigureLuaRestyWAF":      shouldConfigureLuaRestyWAF,
 		"buildLuaSharedDictionaries":      buildLuaSharedDictionaries,
+		"luaConfigurationRequestBodySize": luaConfigurationRequestBodySize,
 		"buildLocation":                   buildLocation,
 		"buildAuthLocation":               buildAuthLocation,
 		"shouldApplyGlobalAuth":           shouldApplyGlobalAuth,
@@ -272,6 +273,22 @@ func buildLuaSharedDictionaries(c interface{}, s interface{}, disableLuaRestyWAF
 	return strings.Join(out, ";\n") + ";\n"
 }
 
+func luaConfigurationRequestBodySize(c interface{}) string {
+	cfg, ok := c.(config.Configuration)
+	if !ok {
+		klog.Errorf("expected a 'config.Configuration' type but %T was returned", c)
+		return "100" // just a default number
+	}
+
+	size := cfg.LuaSharedDicts["configuration_data"]
+	if size < cfg.LuaSharedDicts["certificate_data"] {
+		size = cfg.LuaSharedDicts["certificate_data"]
+	}
+	size = size + 1
+
+	return fmt.Sprintf("%d", size)
+}
+
 // configForLua returns some general configuration as Lua table represented as string
 func configForLua(input interface{}) string {
 	all, ok := input.(config.TemplateConfig)

internal/ingress/controller/template/template_test.go

@@ -225,6 +225,19 @@ func TestBuildLuaSharedDictionaries(t *testing.T) {
 	}
 }
 
+func TestLuaConfigurationRequestBodySize(t *testing.T) {
+	cfg := config.Configuration{
+		LuaSharedDicts: map[string]int{
+			"configuration_data": 10, "certificate_data": 20,
+		},
+	}
+
+	size := luaConfigurationRequestBodySize(cfg)
+	if "21" != size {
+		t.Errorf("expected the size to be 20 but got: %v", size)
+	}
+}
+
 func TestFormatIP(t *testing.T) {
 	cases := map[string]struct {
 		Input, Output string

rootfs/etc/nginx/template/nginx.tmpl

@@ -580,9 +580,8 @@ http {
         }
 
         location /configuration {
-            # this should be equals to configuration_data dict
-            client_max_body_size                    10m;
-            client_body_buffer_size                 10m;
+            client_max_body_size                    {{ luaConfigurationRequestBodySize $cfg }}m;
+            client_body_buffer_size                 {{ luaConfigurationRequestBodySize $cfg }}m;
             proxy_buffering                         off;
 
             content_by_lua_block {