/*
 * Copyright (c) 2016, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 * WSO2 Inc. licenses this file to you 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.wso2.am.integration.tests.header;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.Header;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpOptions;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.HttpClientBuilder;
import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Factory;
import org.testng.annotations.Test;
import org.wso2.am.integration.clients.publisher.api.v1.dto.APIOperationsDTO;
import org.wso2.am.integration.clients.store.api.v1.dto.ApplicationDTO;
import org.wso2.am.integration.clients.store.api.v1.dto.ApplicationKeyDTO;
import org.wso2.am.integration.clients.store.api.v1.dto.ApplicationKeyGenerateRequestDTO;
import org.wso2.am.integration.clients.store.api.v1.dto.SubscriptionDTO;
import org.wso2.am.integration.clients.store.api.v1.dto.SubscriptionListDTO;
import org.wso2.am.integration.test.utils.base.APIMIntegrationConstants;
import org.wso2.am.integration.test.utils.bean.APIRequest;
import org.wso2.am.integration.tests.api.lifecycle.APIManagerLifecycleBaseTest;
import org.wso2.carbon.automation.engine.annotations.ExecutionEnvironment;
import org.wso2.carbon.automation.engine.annotations.SetEnvironment;
import org.wso2.carbon.automation.engine.context.TestUserMode;

import java.io.File;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertNotNull;
import static org.testng.Assert.assertNull;
import static org.testng.Assert.assertTrue;

/**
 * Test CORS functionality
 */
@SetEnvironment(executionEnvironments = {ExecutionEnvironment.ALL })
public class CORSHeadersTestCase extends APIManagerLifecycleBaseTest {

    private static final String API_NAME = "CorsHeadersTestAPI";
    private static final String APPLICATION_NAME = "CorsHeadersApp";
    private static final String API_CONTEXT = "corsHeadersTestAPI";
    private static final String API_VERSION = "1.0.0";
    private static final String TAGS = "cors, test";
    private static final String DESCRIPTION = "This is test API create by API manager integration test";
    private final String API_END_POINT_POSTFIX_URL = "jaxrs_basic/services/customers/customerservice/";

    private static final String ACCESS_CONTROL_ALLOW_ORIGIN_HEADER = "Access-Control-Allow-Origin";
    private static final String ACCESS_CONTROL_ALLOW_ORIGIN_HEADER_VALUE = "*";
    private static final String ACCESS_CONTROL_ALLOW_METHODS_HEADER = "Access-Control-Allow-Methods";
    private static final String ACCESS_CONTROL_ALLOW_METHODS_HEADER_VALUE = "DELETE,POST,PUT,PATCH,GET";
    private static final String ACCESS_CONTROL_ALLOW_HEADERS_HEADER = "Access-Control-Allow-Headers";
    private static final String ACCESS_CONTROL_ALLOW_HEADERS_HEADER_VALUE
            = "authorization,Access-Control-Allow-Origin,Content-Type,SOAPAction,Authorization";
    private static final String ACCESS_CONTROL_ALLOW_CREDENTIALS_HEADER = "Access-Control-Allow-Credentials";

    private String accessToken;
    private String applicationId;
    private String apiId;
    private ArrayList<String> grantTypes;
    private Map<String, String> requestHeaders;
    private String apiEndPointUrl;

    Log log = LogFactory.getLog(CORSHeadersTestCase.class);

    @BeforeClass(alwaysRun = true)
    public void setEnvironment() throws Exception {
        super.init(userMode);
        //Load the back-end dummy API
        if(TestUserMode.SUPER_TENANT_ADMIN == userMode) {
            String gatewaySessionCookie = createSession(gatewayContextMgt);
            loadSynapseConfigurationFromClasspath("artifacts" + File.separator + "AM"
                                                  + File.separator + "synapseconfigs" + File.separator + "rest"
                                                  + File.separator + "dummy_api.xml", gatewayContextMgt,
                                                  gatewaySessionCookie);
        }
        apiEndPointUrl = backEndServerUrl.getWebAppURLHttps() + API_END_POINT_POSTFIX_URL;
        String providerName = user.getUserName();
        APIRequest apiRequest = new APIRequest(API_NAME, API_CONTEXT, new URL(apiEndPointUrl), true);
        apiRequest.setTags(TAGS);
        apiRequest.setDescription(DESCRIPTION);
        apiRequest.setTiersCollection(TIER_UNLIMITED);
        apiRequest.setProvider(providerName);
        //Add api resource
        APIOperationsDTO apiOperationsDTO1 = new APIOperationsDTO();
        apiOperationsDTO1.setVerb(APIMIntegrationConstants.HTTP_VERB_GET);
        apiOperationsDTO1.setTarget("/customers/{id}");
        apiOperationsDTO1.setAuthType(APIMIntegrationConstants.RESOURCE_AUTH_TYPE_APPLICATION_AND_APPLICATION_USER);
        apiOperationsDTO1.setThrottlingPolicy(APIMIntegrationConstants.RESOURCE_TIER.UNLIMITED);

        List<APIOperationsDTO> operationsDTOS = new ArrayList<>();
        operationsDTOS.add(apiOperationsDTO1);
        apiRequest.setOperationsDTOS(operationsDTOS);

        //Create application
        org.wso2.carbon.automation.test.utils.http.client.HttpResponse applicationResponse =
                restAPIStore.createApplication(APPLICATION_NAME,
                        APIMIntegrationConstants.APPLICATION_TIER.DEFAULT_APP_POLICY_FIFTY_REQ_PER_MIN,
                        APIMIntegrationConstants.APPLICATION_TIER.UNLIMITED,
                        ApplicationDTO.TokenTypeEnum.OAUTH);
        applicationId = applicationResponse.getData();

        //get access token
        grantTypes = new ArrayList<>();
        grantTypes.add(APIMIntegrationConstants.GRANT_TYPE.PASSWORD);
        grantTypes.add(APIMIntegrationConstants.GRANT_TYPE.CLIENT_CREDENTIAL);
        ApplicationKeyDTO applicationKeyDTO = restAPIStore.generateKeys(applicationId, "36000", "",
                ApplicationKeyGenerateRequestDTO.KeyTypeEnum.PRODUCTION, null, grantTypes);
        accessToken = applicationKeyDTO.getToken().getAccessToken();

        // Create requestHeaders
        requestHeaders = new HashMap<String, String>();
        requestHeaders.put("accept", "text/xml");
        requestHeaders.put("Authorization", "Bearer " + applicationKeyDTO.getToken().getAccessToken());

        apiId = createPublishAndSubscribeToAPIUsingRest(apiRequest, restAPIPublisher, restAPIStore, applicationId,
                APIMIntegrationConstants.API_TIER.UNLIMITED);

        waitForAPIDeploymentSync(user.getUserName(), API_NAME, API_VERSION, APIMIntegrationConstants.IS_API_EXISTS);
    }

    @Test(groups = {"wso2.am"}, description = "Checking CORS headers in pre-flight response")
    public void CheckCORSHeadersInPreFlightResponse() throws Exception {
        HttpClient httpclient = HttpClientBuilder.create().build();
        HttpUriRequest option = new HttpOptions(getAPIInvocationURLHttps(API_CONTEXT, API_VERSION) + "/customers/123");
        option.addHeader("Origin", "http://localhost");
        option.addHeader("Access-Control-Request-Method", "GET");
        HttpResponse response = httpclient.execute(option);

       assertEquals(response.getStatusLine().getStatusCode(), HTTP_RESPONSE_CODE_OK, "Response code mismatch.");

        Header[] responseHeaders = response.getAllHeaders();

        log.info("Response Headers: CheckCORSHeadersInPreFlightResponse");
        for (Header header : responseHeaders) {
            log.info(header.getName() + " : " + header.getValue());
        }

        Header header = pickHeader(responseHeaders, ACCESS_CONTROL_ALLOW_ORIGIN_HEADER);
        assertNotNull(header, ACCESS_CONTROL_ALLOW_ORIGIN_HEADER + " header is not available in the response.");
        assertEquals(header.getValue(), ACCESS_CONTROL_ALLOW_ORIGIN_HEADER_VALUE,
                     ACCESS_CONTROL_ALLOW_ORIGIN_HEADER + " header value mismatch.");

        header = pickHeader(responseHeaders, ACCESS_CONTROL_ALLOW_METHODS_HEADER);
        assertNotNull(header, ACCESS_CONTROL_ALLOW_METHODS_HEADER + " header is not available in the response.");
        assertTrue(ACCESS_CONTROL_ALLOW_METHODS_HEADER_VALUE.contains(header.getValue()),
                header.getValue() + " header value mismatch.");

        header = pickHeader(responseHeaders, ACCESS_CONTROL_ALLOW_HEADERS_HEADER);
        assertNotNull(header, ACCESS_CONTROL_ALLOW_HEADERS_HEADER + " header is not available in the response.");
        assertEquals(header.getValue(), ACCESS_CONTROL_ALLOW_HEADERS_HEADER_VALUE,
                     ACCESS_CONTROL_ALLOW_HEADERS_HEADER + " header value mismatch.");

        assertNull(pickHeader(responseHeaders, ACCESS_CONTROL_ALLOW_CREDENTIALS_HEADER),
                    ACCESS_CONTROL_ALLOW_CREDENTIALS_HEADER + " header is available in the response, " +
                    "but it should not be.");
    }

    @Test(groups = {"wso2.am"}, description = "Checking CORS headers in response",
            dependsOnMethods = "CheckCORSHeadersInPreFlightResponse")
    public void CheckCORSHeadersInResponse() throws Exception {
        HttpClient httpclient = HttpClientBuilder.create().build();
        HttpGet get = new HttpGet(getAPIInvocationURLHttps(API_CONTEXT, API_VERSION) + "/customers/123");
        get.addHeader("Origin", "http://localhost");
        get.addHeader("Authorization", "Bearer " + accessToken);

        HttpResponse response = httpclient.execute(get);
        assertEquals(response.getStatusLine().getStatusCode(), HTTP_RESPONSE_CODE_OK, "Response code mismatch.");

        Header[] responseHeaders = response.getAllHeaders();

        log.info("Response Headers: CheckCORSHeadersInResponse");
        for (Header header : responseHeaders) {
            log.info(header.getName() + " : " + header.getValue());
        }

        Header header = pickHeader(responseHeaders, ACCESS_CONTROL_ALLOW_ORIGIN_HEADER);
        assertNotNull(header, ACCESS_CONTROL_ALLOW_ORIGIN_HEADER + " header is not available in the response.");
        assertEquals(header.getValue(), ACCESS_CONTROL_ALLOW_ORIGIN_HEADER_VALUE,
                     ACCESS_CONTROL_ALLOW_ORIGIN_HEADER + " header value mismatch.");

        header = pickHeader(responseHeaders, ACCESS_CONTROL_ALLOW_METHODS_HEADER);
        assertNotNull(header, ACCESS_CONTROL_ALLOW_METHODS_HEADER + " header is not available in the response.");
             assertTrue(ACCESS_CONTROL_ALLOW_METHODS_HEADER_VALUE.contains(header.getValue()),
                     ACCESS_CONTROL_ALLOW_METHODS_HEADER + " header value mismatch.");

        header = pickHeader(responseHeaders, ACCESS_CONTROL_ALLOW_HEADERS_HEADER);
        assertNotNull(header, ACCESS_CONTROL_ALLOW_HEADERS_HEADER + " header is not available in the response.");
        assertEquals(header.getValue(), ACCESS_CONTROL_ALLOW_HEADERS_HEADER_VALUE,
                     ACCESS_CONTROL_ALLOW_HEADERS_HEADER + " header value mismatch.");

        assertNull(pickHeader(responseHeaders, ACCESS_CONTROL_ALLOW_CREDENTIALS_HEADER),
                   ACCESS_CONTROL_ALLOW_CREDENTIALS_HEADER + " header is available in the response, " +
                   "but it should not be.");
    }

    @AfterClass(alwaysRun = true)
    public void destroy() throws Exception {
        SubscriptionListDTO subsDTO = restAPIStore.getAllSubscriptionsOfApplication(applicationId);
        for (SubscriptionDTO subscriptionDTO: subsDTO.getList()){
            restAPIStore.removeSubscription(subscriptionDTO.getSubscriptionId());
        }
        restAPIStore.deleteApplication(applicationId);
        restAPIPublisher.deleteAPI(apiId);

        super.cleanUp();
    }

    @DataProvider
    public static Object[][] userModeDataProvider() {
        return new Object[][] { new Object[] {TestUserMode.SUPER_TENANT_ADMIN },
                                new Object[] { TestUserMode.TENANT_ADMIN } };
    }

    @Factory(dataProvider = "userModeDataProvider")
    public CORSHeadersTestCase(TestUserMode userMode) {
        this.userMode = userMode;
    }
}
