/*
 * Copyright 2004-present 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
 *
 *      https://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.oauth2.client.web;

import java.util.HashMap;
import java.util.Map;

import org.junit.jupiter.api.Test;

import org.springframework.mock.web.MockHttpServletRequest;
import org.springframework.mock.web.MockHttpServletResponse;
import org.springframework.mock.web.MockHttpSession;
import org.springframework.security.oauth2.core.endpoint.OAuth2AuthorizationRequest;
import org.springframework.security.oauth2.core.endpoint.OAuth2ParameterNames;

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;

/**
 * Tests for {@link HttpSessionOAuth2AuthorizationRequestRepository}.
 *
 * @author Joe Grandja
 * @author Craig Andrews
 */
public class HttpSessionOAuth2AuthorizationRequestRepositoryTests {

	private HttpSessionOAuth2AuthorizationRequestRepository authorizationRequestRepository = new HttpSessionOAuth2AuthorizationRequestRepository();

	@Test
	public void loadAuthorizationRequestWhenHttpServletRequestIsNullThenThrowIllegalArgumentException() {
		assertThatIllegalArgumentException()
			.isThrownBy(() -> this.authorizationRequestRepository.loadAuthorizationRequest(null));
	}

	@Test
	public void loadAuthorizationRequestWhenNotSavedThenReturnNull() {
		MockHttpServletRequest request = new MockHttpServletRequest();
		request.addParameter(OAuth2ParameterNames.STATE, "state-1234");
		OAuth2AuthorizationRequest authorizationRequest = this.authorizationRequestRepository
			.loadAuthorizationRequest(request);
		assertThat(authorizationRequest).isNull();
	}

	@Test
	public void loadAuthorizationRequestWhenSavedThenReturnAuthorizationRequest() {
		MockHttpServletRequest request = new MockHttpServletRequest();
		MockHttpServletResponse response = new MockHttpServletResponse();
		OAuth2AuthorizationRequest authorizationRequest = createAuthorizationRequest().build();
		this.authorizationRequestRepository.saveAuthorizationRequest(authorizationRequest, request, response);
		request.addParameter(OAuth2ParameterNames.STATE, authorizationRequest.getState());
		OAuth2AuthorizationRequest loadedAuthorizationRequest = this.authorizationRequestRepository
			.loadAuthorizationRequest(request);
		assertThat(loadedAuthorizationRequest).isEqualTo(authorizationRequest);
	}

	@Test
	public void loadAuthorizationRequestWhenSavedAndStateParameterNullThenReturnNull() {
		MockHttpServletRequest request = new MockHttpServletRequest();
		OAuth2AuthorizationRequest authorizationRequest = createAuthorizationRequest().build();
		this.authorizationRequestRepository.saveAuthorizationRequest(authorizationRequest, request,
				new MockHttpServletResponse());
		assertThat(this.authorizationRequestRepository.loadAuthorizationRequest(request)).isNull();
	}

	@Test
	public void saveAuthorizationRequestWhenHttpServletRequestIsNullThenThrowIllegalArgumentException() {
		OAuth2AuthorizationRequest authorizationRequest = createAuthorizationRequest().build();
		assertThatIllegalArgumentException().isThrownBy(() -> this.authorizationRequestRepository
			.saveAuthorizationRequest(authorizationRequest, null, new MockHttpServletResponse()));
	}

	@Test
	public void saveAuthorizationRequestWhenHttpServletResponseIsNullThenThrowIllegalArgumentException() {
		OAuth2AuthorizationRequest authorizationRequest = createAuthorizationRequest().build();
		assertThatIllegalArgumentException().isThrownBy(() -> this.authorizationRequestRepository
			.saveAuthorizationRequest(authorizationRequest, new MockHttpServletRequest(), null));
	}

	@Test
	public void saveAuthorizationRequestWhenStateNullThenThrowIllegalArgumentException() {
		OAuth2AuthorizationRequest authorizationRequest = createAuthorizationRequest().state(null).build();
		assertThatIllegalArgumentException()
			.isThrownBy(() -> this.authorizationRequestRepository.saveAuthorizationRequest(authorizationRequest,
					new MockHttpServletRequest(), new MockHttpServletResponse()));
	}

	@Test
	public void saveAuthorizationRequestWhenNotNullThenSaved() {
		MockHttpServletRequest request = new MockHttpServletRequest();
		OAuth2AuthorizationRequest authorizationRequest = createAuthorizationRequest().build();
		this.authorizationRequestRepository.saveAuthorizationRequest(authorizationRequest, request,
				new MockHttpServletResponse());
		request.addParameter(OAuth2ParameterNames.STATE, authorizationRequest.getState());
		OAuth2AuthorizationRequest loadedAuthorizationRequest = this.authorizationRequestRepository
			.loadAuthorizationRequest(request);
		assertThat(loadedAuthorizationRequest).isEqualTo(authorizationRequest);
	}

	@Test
	public void saveAuthorizationRequestWhenNoExistingSessionAndDistributedSessionThenSaved() {
		MockHttpServletRequest request = new MockHttpServletRequest();
		request.setSession(new MockDistributedHttpSession());
		OAuth2AuthorizationRequest authorizationRequest = createAuthorizationRequest().build();
		this.authorizationRequestRepository.saveAuthorizationRequest(authorizationRequest, request,
				new MockHttpServletResponse());
		request.addParameter(OAuth2ParameterNames.STATE, authorizationRequest.getState());
		OAuth2AuthorizationRequest loadedAuthorizationRequest = this.authorizationRequestRepository
			.loadAuthorizationRequest(request);
		assertThat(loadedAuthorizationRequest).isEqualTo(authorizationRequest);
	}

	@Test
	public void saveAuthorizationRequestWhenExistingSessionAndDistributedSessionThenSaved() {
		MockHttpServletRequest request = new MockHttpServletRequest();
		request.setSession(new MockDistributedHttpSession());
		OAuth2AuthorizationRequest authorizationRequest1 = createAuthorizationRequest().build();
		this.authorizationRequestRepository.saveAuthorizationRequest(authorizationRequest1, request,
				new MockHttpServletResponse());
		OAuth2AuthorizationRequest authorizationRequest2 = createAuthorizationRequest().build();
		this.authorizationRequestRepository.saveAuthorizationRequest(authorizationRequest2, request,
				new MockHttpServletResponse());
		request.addParameter(OAuth2ParameterNames.STATE, authorizationRequest2.getState());
		OAuth2AuthorizationRequest loadedAuthorizationRequest = this.authorizationRequestRepository
			.loadAuthorizationRequest(request);
		assertThat(loadedAuthorizationRequest).isEqualTo(authorizationRequest2);
	}

	@Test
	public void saveAuthorizationRequestWhenNullThenRemoved() {
		MockHttpServletRequest request = new MockHttpServletRequest();
		MockHttpServletResponse response = new MockHttpServletResponse();
		OAuth2AuthorizationRequest authorizationRequest = createAuthorizationRequest().build();
		this.authorizationRequestRepository.saveAuthorizationRequest(authorizationRequest, request, response);
		request.addParameter(OAuth2ParameterNames.STATE, authorizationRequest.getState());
		this.authorizationRequestRepository.saveAuthorizationRequest(null, request, response);
		OAuth2AuthorizationRequest loadedAuthorizationRequest = this.authorizationRequestRepository
			.loadAuthorizationRequest(request);
		assertThat(loadedAuthorizationRequest).isNull();
	}

	@Test
	public void removeAuthorizationRequestWhenHttpServletRequestIsNullThenThrowIllegalArgumentException() {
		assertThatIllegalArgumentException().isThrownBy(() -> this.authorizationRequestRepository
			.removeAuthorizationRequest(null, new MockHttpServletResponse()));
	}

	@Test
	public void removeAuthorizationRequestWhenHttpServletResponseIsNullThenThrowIllegalArgumentException() {
		assertThatIllegalArgumentException().isThrownBy(() -> this.authorizationRequestRepository
			.removeAuthorizationRequest(new MockHttpServletRequest(), null));
	}

	@Test
	public void removeAuthorizationRequestWhenSavedThenRemoved() {
		MockHttpServletRequest request = new MockHttpServletRequest();
		MockHttpServletResponse response = new MockHttpServletResponse();
		OAuth2AuthorizationRequest authorizationRequest = createAuthorizationRequest().build();
		this.authorizationRequestRepository.saveAuthorizationRequest(authorizationRequest, request, response);
		request.addParameter(OAuth2ParameterNames.STATE, authorizationRequest.getState());
		OAuth2AuthorizationRequest removedAuthorizationRequest = this.authorizationRequestRepository
			.removeAuthorizationRequest(request, response);
		OAuth2AuthorizationRequest loadedAuthorizationRequest = this.authorizationRequestRepository
			.loadAuthorizationRequest(request);
		assertThat(removedAuthorizationRequest).isNotNull();
		assertThat(loadedAuthorizationRequest).isNull();
	}

	// gh-5263
	@Test
	public void removeAuthorizationRequestWhenSavedThenRemovedFromSession() {
		MockHttpServletRequest request = new MockHttpServletRequest();
		MockHttpServletResponse response = new MockHttpServletResponse();
		OAuth2AuthorizationRequest authorizationRequest = createAuthorizationRequest().build();
		this.authorizationRequestRepository.saveAuthorizationRequest(authorizationRequest, request, response);
		request.addParameter(OAuth2ParameterNames.STATE, authorizationRequest.getState());
		OAuth2AuthorizationRequest removedAuthorizationRequest = this.authorizationRequestRepository
			.removeAuthorizationRequest(request, response);
		String sessionAttributeName = HttpSessionOAuth2AuthorizationRequestRepository.class.getName()
				+ ".AUTHORIZATION_REQUEST";
		assertThat(removedAuthorizationRequest).isNotNull();
		assertThat(request.getSession().getAttribute(sessionAttributeName)).isNull();
	}

	@Test
	public void removeAuthorizationRequestWhenNotSavedThenNotRemoved() {
		MockHttpServletRequest request = new MockHttpServletRequest();
		request.addParameter(OAuth2ParameterNames.STATE, "state-1234");
		MockHttpServletResponse response = new MockHttpServletResponse();
		OAuth2AuthorizationRequest removedAuthorizationRequest = this.authorizationRequestRepository
			.removeAuthorizationRequest(request, response);
		assertThat(removedAuthorizationRequest).isNull();
	}

	protected OAuth2AuthorizationRequest.Builder createAuthorizationRequest() {
		return OAuth2AuthorizationRequest.authorizationCode()
			.authorizationUri("https://example.com/oauth2/authorize")
			.clientId("client-id-1234")
			.state("state-1234");
	}

	static class MockDistributedHttpSession extends MockHttpSession {

		@Override
		public Object getAttribute(String name) {
			return wrap(super.getAttribute(name));
		}

		@Override
		public void setAttribute(String name, Object value) {
			super.setAttribute(name, wrap(value));
		}

		private Object wrap(Object object) {
			if (object instanceof Map) {
				object = new HashMap<>((Map<Object, Object>) object);
			}
			return object;
		}

	}

}
