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/*-
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.openecomp.sdc.servlets;

import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import java.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.eclipse.jetty.client.api.Request;
import org.eclipse.jetty.http.HttpFields;
import org.junit.BeforeClass;
import org.junit.Test;
import org.mockito.Mockito;
import org.openecomp.sdc.common.api.Constants;
import org.openecomp.sdc.fe.config.Configuration;
import org.openecomp.sdc.fe.config.ConfigurationManager;
import org.openecomp.sdc.fe.servlets.FeProxyServlet;

public class FeProxyServletTest {
	/*
	 * Example Url Mappings:
	 * http://localhost:8080/sdc1/feProxy/rest/services/MichaelTest2/0.0.1/csar
	 * --> http://localhost:8090/sdc2/rest/services/MichaelTest2/0.0.1/csar
	 * http://localhost:8080/sdc1/feProxy/dummy/not/working -->
	 * http://localhost:8090/sdc2/dummy/not/working
	 */
	FeProxyServlet feProxy = new FeProxyServlet();
	final static HttpServletRequest servletRequest = Mockito.mock(HttpServletRequest.class);
	final static HttpSession httpSession = Mockito.mock(HttpSession.class);
	final static ServletContext servletContext = Mockito.mock(ServletContext.class);
	final static ConfigurationManager configurationManager = Mockito.mock(ConfigurationManager.class);
	final static Configuration configuration = Mockito.mock(Configuration.class);
	final static Request proxyRequest = Mockito.spy(Request.class);
	final static HttpFields httpFields = Mockito.mock(HttpFields.class);

	final static String BE_PROTOCOL = "http";
	final static String BE_HOST = "172.20.43.124";
	final static int BE_PORT = 8090;
	final static String HEADER_1 = "Header1";
	final static String HEADER_2 = "Header2";
	final static String HEADER_3 = "Header3";
	final static String HEADER_1_VAL = "Header1_Val";
	final static String HEADER_2_VAL = "Header2_Val";
	final static String HEADER_3_VAL = "Header3_Val";
	final static String REQUEST_ID_VAL = "4867495a-5ed7-49e4-8be2-cc8d66fdd52b";

	@BeforeClass
	public static void beforeClass() {
		when(servletRequest.getSession()).thenReturn(httpSession);
		when(httpSession.getServletContext()).thenReturn(servletContext);
		when(servletContext.getAttribute(Constants.CONFIGURATION_MANAGER_ATTR)).thenReturn(configurationManager);
		when(configurationManager.getConfiguration()).thenReturn(configuration);
		when(configuration.getBeProtocol()).thenReturn(BE_PROTOCOL);
		when(configuration.getBeHost()).thenReturn(BE_HOST);
		when(configuration.getBeHttpPort()).thenReturn(BE_PORT);

		List<String> strList = new ArrayList<String>();
		strList.add(HEADER_1);
		strList.add(HEADER_2);
		strList.add(HEADER_3);

		when(servletRequest.getHeaderNames()).thenReturn(Collections.enumeration(strList));
		when(servletRequest.getHeader(HEADER_1)).thenReturn(HEADER_1_VAL);
		when(servletRequest.getHeader(HEADER_2)).thenReturn(HEADER_2_VAL);
		when(servletRequest.getHeader(HEADER_3)).thenReturn(HEADER_3_VAL);
		when(servletRequest.getHeader(Constants.X_ECOMP_REQUEST_ID_HEADER)).thenReturn(REQUEST_ID_VAL);

		when(proxyRequest.getHeaders()).thenReturn(httpFields);
		when(httpFields.containsKey(HEADER_1)).thenReturn(true);
		when(httpFields.containsKey(HEADER_2)).thenReturn(true);
		when(httpFields.containsKey(HEADER_3)).thenReturn(false);

	}

	@Test
	public void testRewriteURI_APIRequest() {
		when(servletRequest.getRequestURI()).thenReturn("/sdc1/feProxy/rest/dummyBeAPI");
		String requestResourceUrl = "http://localhost:8080/sdc1/feProxy/rest/dummyBeAPI";
		String expectedChangedUrl = BE_PROTOCOL + "://" + BE_HOST + ":" + BE_PORT + "/sdc2/rest/dummyBeAPI";
		when(servletRequest.getRequestURL()).thenReturn(new StringBuffer(requestResourceUrl));

		when(servletRequest.getContextPath()).thenReturn("/sdc1");
		when(servletRequest.getServletPath()).thenReturn("/feProxy/rest/dummyBeAPI");

		URI rewriteURI = feProxy.rewriteURI(servletRequest);

		assertTrue(rewriteURI.toString().equals(expectedChangedUrl));
	}

	@Test
	public void testRewriteURIWithQureyParam_APIRequest() {
		when(servletRequest.getRequestURI()).thenReturn("/sdc1/feProxy/rest/gg%20g?subtype=VF");
		String requestResourceUrl = "http://localhost:8080/sdc1/feProxy/rest/gg%20g?subtype=VF";
		String expectedChangedUrl = BE_PROTOCOL + "://" + BE_HOST + ":" + BE_PORT + "/sdc2/rest/gg%20g?subtype=VF";
		when(servletRequest.getRequestURL()).thenReturn(new StringBuffer(requestResourceUrl));

		when(servletRequest.getContextPath()).thenReturn("/sdc1");
		when(servletRequest.getServletPath()).thenReturn("/feProxy/rest/gg%20g?subtype=VF");

		URI rewriteURI = feProxy.rewriteURI(servletRequest);

		assertTrue(rewriteURI.toString().equals(expectedChangedUrl));
	}

	@Test
	public void testCustomizeProxyRequest() {
		feProxy.customizeProxyRequest(proxyRequest, servletRequest);
		verify(proxyRequest).header(HEADER_3, HEADER_3_VAL);
		verify(proxyRequest, times(1)).header(Mockito.anyString(), Mockito.anyString());

	}
}