NGINX: Migrate server redirects to NJS.

Author: elizabeth-dev

rootfs/etc/nginx/js/nginx/ngx_srv_redirect.js

@@ -0,0 +1,16 @@
+function srv_redirect(req) {
+    const redirectTo = req.variables.tmp_redirect_to;
+
+    const requestUri = req.variables.request_uri.replace(/\/$/, '');
+
+    const useForwardedHeaders = req.variables.forwarded_headers
+    const xForwardedProto = req.variables.http_x_forwarded_proto;
+    const xForwardedPort = req.variables.http_x_forwarded_port;
+
+    const redirectScheme = useForwardedHeaders && xForwardedProto ? xForwardedProto : req.variables.scheme;
+    const redirectPort = useForwardedHeaders && xForwardedPort ? xForwardedPort : req.variables.server_port;
+
+    return `${redirectScheme}://${redirectTo}:${redirectPort}${requestUri}`;
+}
+
+export default { srv_redirect };

rootfs/etc/nginx/template/nginx.tmpl

@@ -12,6 +12,8 @@
 # setup custom paths that do not require root access
 pid {{ .PID }};
 
+load_module /etc/nginx/modules/ngx_http_js_module.so;
+
 {{ if $cfg.UseGeoIP2 }}
 load_module /etc/nginx/modules/ngx_http_geoip2_module.so;
 {{ end }}
@@ -74,6 +76,10 @@ http {
 
     init_worker_by_lua_file /etc/nginx/lua/ngx_conf_init_worker.lua;
 
+    js_import /etc/nginx/js/nginx/ngx_srv_redirect.js;
+
+    js_set $njs_srv_redirect ngx_srv_redirect.srv_redirect;
+
     {{/* Enable the real_ip module only if we use either X-Forwarded headers or Proxy Protocol. */}}
     {{/* we use the value of the real IP for the geo_ip module */}}
     {{ if or (or $cfg.UseForwardedHeaders $cfg.UseProxyProtocol) $cfg.EnableRealIP }}
@@ -607,9 +613,10 @@ http {
         }
         {{ end }}
 
-        set_by_lua_file $redirect_to /etc/nginx/lua/nginx/ngx_srv_redirect.lua {{ $redirect.To }}; 
+        set $tmp_redirect_to '{{ $redirect.To }}';
+        set $tmp_forwarded_headers '{{ $cfg.UseForwardedHeaders }}';
 
-        return {{ $all.Cfg.HTTPRedirectCode }} $redirect_to;
+        return {{ $all.Cfg.HTTPRedirectCode }} $njs_srv_redirect;
     }
     ## end server {{ $redirect.From }}
     {{ end }}

test/e2e/annotations/fromtowwwredirect.go

@@ -49,7 +49,7 @@ var _ = framework.DescribeAnnotation("from-to-www-redirect", func() {
 		f.WaitForNginxConfiguration(
 			func(cfg string) bool {
 				return strings.Contains(cfg, `server_name www.fromtowwwredirect.bar.com;`) &&
-					strings.Contains(cfg, `return 308 $redirect_to;`)
+					strings.Contains(cfg, `return 308 $njs_srv_redirect;`)
 			})
 
 		ginkgo.By("sending request to www.fromtowwwredirect.bar.com")
@@ -88,7 +88,7 @@ var _ = framework.DescribeAnnotation("from-to-www-redirect", func() {
 		f.WaitForNginxServer(toHost,
 			func(server string) bool {
 				return strings.Contains(server, fmt.Sprintf(`server_name %v;`, toHost)) &&
-					strings.Contains(server, `return 308 $redirect_to;`)
+					strings.Contains(server, `return 308 $njs_srv_redirect;`)
 			})
 
 		ginkgo.By("sending request to www should redirect to domain")