Return AuthorizationRequest from AuthorizationRequestRepository.removeAuthorizationRequest

Fixes gh-4652

oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/web/AuthorizationRequestRepository.java

@@ -42,6 +42,6 @@ public interface AuthorizationRequestRepository {
 	void saveAuthorizationRequest(AuthorizationRequest authorizationRequest, HttpServletRequest request,
 									HttpServletResponse response);
 
-	void removeAuthorizationRequest(HttpServletRequest request);
+	AuthorizationRequest removeAuthorizationRequest(HttpServletRequest request);
 
 }

oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/web/HttpSessionAuthorizationRequestRepository.java

@@ -54,7 +54,11 @@ public final class HttpSessionAuthorizationRequestRepository implements Authoriz
 	}
 
 	@Override
-	public void removeAuthorizationRequest(HttpServletRequest request) {
-		request.getSession().removeAttribute(this.sessionAttributeName);
+	public AuthorizationRequest removeAuthorizationRequest(HttpServletRequest request) {
+		AuthorizationRequest authorizationRequest = this.loadAuthorizationRequest(request);
+		if (authorizationRequest != null) {
+			request.getSession().removeAttribute(this.sessionAttributeName);
+		}
+		return authorizationRequest;
 	}
 }