From 6963b3c5d5820f4b0a8569aa7123acce4043e853 Mon Sep 17 00:00:00 2001
From: Joe Grandja <jgrandja@pivotal.io>
Date: Tue, 10 Oct 2017 17:52:47 -0400
Subject: [PATCH] Expose login page config for oauth2Login

Fixes gh-4570
---
 .../configurers/oauth2/client/OAuth2LoginConfigurer.java    | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/config/src/main/java/org/springframework/security/config/annotation/web/configurers/oauth2/client/OAuth2LoginConfigurer.java b/config/src/main/java/org/springframework/security/config/annotation/web/configurers/oauth2/client/OAuth2LoginConfigurer.java
index 0ef139cdd9..e17bd7ddf4 100644
--- a/config/src/main/java/org/springframework/security/config/annotation/web/configurers/oauth2/client/OAuth2LoginConfigurer.java
+++ b/config/src/main/java/org/springframework/security/config/annotation/web/configurers/oauth2/client/OAuth2LoginConfigurer.java
@@ -72,6 +72,12 @@ public final class OAuth2LoginConfigurer<B extends HttpSecurityBuilder<B>> exten
 		return this;
 	}
 
+	@Override
+	public OAuth2LoginConfigurer<B> loginPage(String loginPage) {
+		Assert.hasText(loginPage, "loginPage cannot be empty");
+		return super.loginPage(loginPage);
+	}
+
 	public AuthorizationEndpointConfig authorizationEndpoint() {
 		return this.authorizationEndpointConfig;
 	}