/*
 * Copyright 2012-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.security.web.csrf;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.runners.MockitoJUnitRunner;

import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyZeroInteractions;
import static org.mockito.Mockito.when;

/**
 * @author Rob Winch
 */
@RunWith(MockitoJUnitRunner.class)
public class LazyCsrfTokenRepositoryTests {
	@Mock
	CsrfTokenRepository delegate;
	@Mock
	HttpServletRequest request;
	@Mock
	HttpServletResponse response;

	@InjectMocks
	LazyCsrfTokenRepository repository;

	DefaultCsrfToken token;

	@Before
	public void setup() {
		this.token = new DefaultCsrfToken("header", "param", "token");
		when(this.delegate.generateToken(this.request)).thenReturn(this.token);
		when(this.request.getAttribute(HttpServletResponse.class.getName()))
				.thenReturn(this.response);
	}

	@Test(expected = IllegalArgumentException.class)
	public void constructNullDelegateThrowsIllegalArgumentException() {
		new LazyCsrfTokenRepository(null);
	}

	@Test(expected = IllegalArgumentException.class)
	public void generateTokenNullResponseAttribute() {
		this.repository.generateToken(mock(HttpServletRequest.class));
	}

	@Test
	public void generateTokenGetTokenSavesToken() {
		CsrfToken newToken = this.repository.generateToken(this.request);

		newToken.getToken();

		verify(this.delegate).saveToken(this.token, this.request, this.response);
	}

	@Test
	public void saveNonNullDoesNothing() {
		this.repository.saveToken(this.token, this.request, this.response);

		verifyZeroInteractions(this.delegate);
	}

	@Test
	public void saveNullDelegates() {
		this.repository.saveToken(null, this.request, this.response);

		verify(this.delegate).saveToken(null, this.request, this.response);
	}

	@Test
	public void loadTokenDelegates() {
		when(this.delegate.loadToken(this.request)).thenReturn(this.token);

		CsrfToken loadToken = this.repository.loadToken(this.request);
		assertThat(loadToken).isSameAs(this.token);

		verify(this.delegate).loadToken(this.request);
	}
}