/*******************************************************************************
 * ============LICENSE_START==================================================
 * * org.onap.dmaap
 * * ===========================================================================
 * * Copyright © 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====================================================
 * *
 * * ECOMP is a trademark and service mark of AT&T Intellectual Property.
 * *
 ******************************************************************************/


package org.onap.dmaap.datarouter.provisioning;

import com.att.eelf.configuration.EELFLogger;
import com.att.eelf.configuration.EELFManager;
import org.json.JSONObject;
import org.onap.dmaap.datarouter.authz.AuthorizationResponse;
import org.onap.dmaap.datarouter.provisioning.beans.EventLogRecord;
import org.onap.dmaap.datarouter.provisioning.beans.Feed;
import org.onap.dmaap.datarouter.provisioning.eelf.EelfMsgs;
import org.onap.dmaap.datarouter.provisioning.utils.JSONUtilities;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InvalidObjectException;
import java.util.List;

import static org.onap.dmaap.datarouter.provisioning.utils.HttpServletUtils.sendResponseError;

/**
 * This servlet handles provisioning for the <drFeedsURL> which is the URL on the provisioning server used to
 * create new feeds.  It supports POST to create new feeds, and GET to support the Feeds Collection Query function.
 *
 * @author Robert Eby
 * @version $Id$
 */
@SuppressWarnings("serial")
public class DRFeedsServlet extends ProxyServlet {

    //Adding EELF Logger Rally:US664892
    private static EELFLogger eelfLogger = EELFManager.getInstance()
            .getLogger(DRFeedsServlet.class);

    /**
     * DELETE on the <drFeedsURL> -- not supported.
     */
    @Override
    public void doDelete(HttpServletRequest req, HttpServletResponse resp) {
        setIpFqdnRequestIDandInvocationIDForEelf("doDelete", req);
        eelfLogger.info(EelfMsgs.ENTRY);
        try {
            eelfLogger.info(EelfMsgs.MESSAGE_WITH_BEHALF_AND_FEEDID, req.getHeader(BEHALF_HEADER), getIdFromPath(req) + "");
            String message = "DELETE not allowed for the drFeedsURL.";
            EventLogRecord elr = new EventLogRecord(req);
            elr.setMessage(message);
            elr.setResult(HttpServletResponse.SC_METHOD_NOT_ALLOWED);
            eventlogger.error(elr.toString());
            sendResponseError(resp, HttpServletResponse.SC_METHOD_NOT_ALLOWED, message, eventlogger);
        } finally {
            eelfLogger.info(EelfMsgs.EXIT);
        }
    }

    /**
     * GET on the &lt;drFeedsURL&gt; -- query the list of feeds already existing in the DB. See the <i>Feeds Collection
     * Queries</i> section in the <b>Provisioning API</b> document for details on how this method should be invoked.
     */
    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse resp) {
        setIpFqdnRequestIDandInvocationIDForEelf("doGet", req);
        eelfLogger.info(EelfMsgs.ENTRY);
        try {
            eelfLogger.info(EelfMsgs.MESSAGE_WITH_BEHALF_AND_FEEDID, req.getHeader(BEHALF_HEADER), getIdFromPath(req) + "");
            EventLogRecord elr = new EventLogRecord(req);
            String message = isAuthorizedForProvisioning(req);
            if (message != null) {
                elr.setMessage(message);
                elr.setResult(HttpServletResponse.SC_FORBIDDEN);
                eventlogger.error(elr.toString());
                sendResponseError(resp, HttpServletResponse.SC_FORBIDDEN, message, eventlogger);
                return;
            }
            if (isProxyServer()) {
                super.doGet(req, resp);
                return;
            }
            String bhdr = req.getHeader(BEHALF_HEADER);
            if (bhdr == null) {
                message = "Missing " + BEHALF_HEADER + " header.";
                elr.setMessage(message);
                elr.setResult(HttpServletResponse.SC_BAD_REQUEST);
                eventlogger.error(elr.toString());
                sendResponseError(resp, HttpServletResponse.SC_BAD_REQUEST, message, eventlogger);
                return;
            }
            // Note: I think this should be getPathInfo(), but that doesn't work (Jetty bug?)
            String path = req.getRequestURI();
            if (path != null && !"/".equals(path)) {
                message = BAD_URL;
                elr.setMessage(message);
                elr.setResult(HttpServletResponse.SC_NOT_FOUND);
                eventlogger.error(elr.toString());
                sendResponseError(resp, HttpServletResponse.SC_NOT_FOUND, message, eventlogger);
                return;
            }
            // Check with the Authorizer
            AuthorizationResponse aresp = authz.decide(req);
            if (!aresp.isAuthorized()) {
                message = POLICY_ENGINE;
                elr.setMessage(message);
                elr.setResult(HttpServletResponse.SC_FORBIDDEN);
                eventlogger.error(elr.toString());
                sendResponseError(resp, HttpServletResponse.SC_FORBIDDEN, message, eventlogger);
                return;
            }

            String name = req.getParameter("name");
            String vers = req.getParameter("version");
            String publ = req.getParameter("publisher");
            String subs = req.getParameter("subscriber");
            if (name != null && vers != null) {
                // Display a specific feed
                Feed feed = Feed.getFeedByNameVersion(name, vers);
                if (feed == null || feed.isDeleted()) {
                    message = "This feed does not exist in the database.";
                    elr.setMessage(message);
                    elr.setResult(HttpServletResponse.SC_BAD_REQUEST);
                    eventlogger.error(elr.toString());
                    sendResponseError(resp, HttpServletResponse.SC_BAD_REQUEST, message, eventlogger);
                } else {
                    // send response
                    elr.setResult(HttpServletResponse.SC_OK);
                    eventlogger.info(elr.toString());
                    resp.setStatus(HttpServletResponse.SC_OK);
                    resp.setContentType(FEEDFULL_CONTENT_TYPE);
                    try {
                        resp.getOutputStream().print(feed.asJSONObject(true).toString());
                    } catch (IOException ioe) {
                        eventlogger.error("PROV0111 DRFeedServlet.doGet " + ioe.getMessage(), ioe);
                    }
                }
            } else {
                // Display a list of URLs
                List<String> list = null;
                if (name != null) {
                    list = Feed.getFilteredFeedUrlList("name", name);
                } else if (publ != null) {
                    list = Feed.getFilteredFeedUrlList("publ", publ);
                } else if (subs != null) {
                    list = Feed.getFilteredFeedUrlList("subs", subs);
                } else {
                    list = Feed.getFilteredFeedUrlList("all", null);
                }
                String t = JSONUtilities.createJSONArray(list);
                // send response
                elr.setResult(HttpServletResponse.SC_OK);
                eventlogger.info(elr.toString());
                resp.setStatus(HttpServletResponse.SC_OK);
                resp.setContentType(FEEDLIST_CONTENT_TYPE);
                try {
                    resp.getOutputStream().print(t);
                } catch (IOException ioe) {
                    eventlogger.error("PROV0112 DRFeedServlet.doGet " + ioe.getMessage(), ioe);
                }
            }
        } finally {
            eelfLogger.info(EelfMsgs.EXIT);
        }
    }

    /**
     * PUT on the &lt;drFeedsURL&gt; -- not supported.
     */
    @Override
    public void doPut(HttpServletRequest req, HttpServletResponse resp) {
        setIpFqdnRequestIDandInvocationIDForEelf("doPut", req);
        eelfLogger.info(EelfMsgs.ENTRY);
        try {
            eelfLogger.info(EelfMsgs.MESSAGE_WITH_BEHALF_AND_FEEDID, req.getHeader(BEHALF_HEADER), getIdFromPath(req) + "");
            String message = "PUT not allowed for the drFeedsURL.";
            EventLogRecord elr = new EventLogRecord(req);
            elr.setMessage(message);
            elr.setResult(HttpServletResponse.SC_METHOD_NOT_ALLOWED);
            eventlogger.error(elr.toString());
            sendResponseError(resp, HttpServletResponse.SC_METHOD_NOT_ALLOWED, message, eventlogger);
        } finally {
            eelfLogger.info(EelfMsgs.EXIT);
        }
    }

    /**
     * POST on the &lt;drFeedsURL&gt; -- create a new feed. See the <i>Creating a Feed</i> section in the
     * <b>Provisioning API</b> document for details on how this method should be invoked.
     */
    @Override
    public void doPost(HttpServletRequest req, HttpServletResponse resp) {
        setIpFqdnRequestIDandInvocationIDForEelf("doPost", req);
        eelfLogger.info(EelfMsgs.ENTRY);
        try {
            eelfLogger.info(EelfMsgs.MESSAGE_WITH_BEHALF, req.getHeader(BEHALF_HEADER));
            EventLogRecord elr = new EventLogRecord(req);
            String message = isAuthorizedForProvisioning(req);
            if (message != null) {
                elr.setMessage(message);
                elr.setResult(HttpServletResponse.SC_FORBIDDEN);
                eventlogger.error(elr.toString());
                sendResponseError(resp, HttpServletResponse.SC_FORBIDDEN, message, eventlogger);
                return;
            }
            if (isProxyServer()) {
                super.doPost(req, resp);
                return;
            }
            String bhdr = req.getHeader(BEHALF_HEADER);
            if (bhdr == null) {
                message = "Missing " + BEHALF_HEADER + " header.";
                elr.setMessage(message);
                elr.setResult(HttpServletResponse.SC_BAD_REQUEST);
                eventlogger.error(elr.toString());
                sendResponseError(resp, HttpServletResponse.SC_BAD_REQUEST, message, eventlogger);
                return;
            }
            // Note: I think this should be getPathInfo(), but that doesn't work (Jetty bug?)
            String path = req.getRequestURI();
            if (path != null && !"/".equals(path)) {
                message = BAD_URL;
                elr.setMessage(message);
                elr.setResult(HttpServletResponse.SC_NOT_FOUND);
                eventlogger.error(elr.toString());
                sendResponseError(resp, HttpServletResponse.SC_NOT_FOUND, message, eventlogger);
                return;
            }
            // check content type is FEED_CONTENT_TYPE, version 1.0
            ContentHeader ch = getContentHeader(req);
            String ver = ch.getAttribute("version");
            if (!ch.getType().equals(FEED_BASECONTENT_TYPE) || !("1.0".equals(ver) || "2.0".equals(ver))) {
                message = "Incorrect content-type";
                elr.setMessage(message);
                elr.setResult(HttpServletResponse.SC_UNSUPPORTED_MEDIA_TYPE);
                eventlogger.error(elr.toString());
                sendResponseError(resp, HttpServletResponse.SC_UNSUPPORTED_MEDIA_TYPE, message, eventlogger);
                return;
            }
            JSONObject jo = getJSONfromInput(req);
            if (jo == null) {
                message = BAD_JSON;
                elr.setMessage(message);
                elr.setResult(HttpServletResponse.SC_BAD_REQUEST);
                eventlogger.error(elr.toString());
                sendResponseError(resp, HttpServletResponse.SC_BAD_REQUEST, message, eventlogger);
                return;
            }
            if (intlogger.isDebugEnabled()) {
                intlogger.debug(jo.toString());
            }
            if (++activeFeeds > maxFeeds) {
                activeFeeds--;
                message = "Cannot create feed; the maximum number of feeds has been configured.";
                elr.setMessage(message);
                elr.setResult(HttpServletResponse.SC_CONFLICT);
                eventlogger.error(elr.toString());
                sendResponseError(resp, HttpServletResponse.SC_CONFLICT, message, eventlogger);
                return;
            }
            Feed feed;
            try {
                feed = new Feed(jo);
            } catch (InvalidObjectException e) {
                message = e.getMessage();
                elr.setMessage(message);
                elr.setResult(HttpServletResponse.SC_BAD_REQUEST);
                eventlogger.error(elr.toString(), e);
                sendResponseError(resp, HttpServletResponse.SC_BAD_REQUEST, message, eventlogger);
                return;
            }

            /*
             * START - AAF changes
             * TDP EPIC US# 307413
             * CADI code - No legacy user check as all new users will be AAF users
             */
            String aafInstance = feed.getAafInstance();
            if (Boolean.parseBoolean(isCadiEnabled)) {
                if ((aafInstance == null || "".equals(aafInstance) || ("legacy".equalsIgnoreCase(aafInstance)) && "true".equalsIgnoreCase(req.getHeader(EXCLUDE_AAF_HEADER)))) {
                    // Check with the Authorizer
                    AuthorizationResponse aresp = authz.decide(req);
                    if (!aresp.isAuthorized()) {
                        message = POLICY_ENGINE;
                        elr.setMessage(message);
                        elr.setResult(HttpServletResponse.SC_FORBIDDEN);
                        eventlogger.error(elr.toString());
                        sendResponseError(resp, HttpServletResponse.SC_FORBIDDEN, message, eventlogger);
                        return;
                    }
                } else {
                    if ("true".equalsIgnoreCase(req.getHeader(EXCLUDE_AAF_HEADER))) {
                        message = "DRFeedsServlet.doPost() -Invalid request exclude_AAF should not be true if passing AAF_Instance value= " + aafInstance;
                        elr.setMessage(message);
                        elr.setResult(HttpServletResponse.SC_FORBIDDEN);
                        eventlogger.error(elr.toString());
                        sendResponseError(resp, HttpServletResponse.SC_FORBIDDEN, message, eventlogger);
                        return;
                    }
                    String permission = getFeedPermission(aafInstance, BaseServlet.CREATE_PERMISSION);
                    eventlogger.info("DRFeedsServlet.doPost().. Permission String - " + permission);
                    if (!req.isUserInRole(permission)) {
                        message = "AAF disallows access to permission - " + permission;
                        elr.setMessage(message);
                        elr.setResult(HttpServletResponse.SC_FORBIDDEN);
                        eventlogger.error(elr.toString());
                        sendResponseError(resp, HttpServletResponse.SC_FORBIDDEN, message, eventlogger);
                        return;
                    }
                }
            } else {
                AuthorizationResponse aresp = authz.decide(req);
                if (!aresp.isAuthorized()) {
                    message = POLICY_ENGINE;
                    elr.setMessage(message);
                    elr.setResult(HttpServletResponse.SC_FORBIDDEN);
                    eventlogger.error(elr.toString());
                    sendResponseError(resp, HttpServletResponse.SC_FORBIDDEN, message, eventlogger);
                    return;
                }
            }
            /*
             * END - AAF changes
             */

            feed.setPublisher(bhdr);    // set from X-DMAAP-DR-ON-BEHALF-OF header

            // Check if this feed already exists
            Feed feed2 = Feed.getFeedByNameVersion(feed.getName(), feed.getVersion());
            if (feed2 != null) {
                message = "This feed already exists in the database.";
                elr.setMessage(message);
                elr.setResult(HttpServletResponse.SC_BAD_REQUEST);
                eventlogger.error(elr.toString());
                sendResponseError(resp, HttpServletResponse.SC_BAD_REQUEST, message, eventlogger);
                return;
            }

            // Create FEED table entries
            if (doInsert(feed)) {
                // send response
                elr.setResult(HttpServletResponse.SC_CREATED);
                eventlogger.info(elr.toString());
                resp.setStatus(HttpServletResponse.SC_CREATED);
                resp.setContentType(FEEDFULL_CONTENT_TYPE);
                resp.setHeader("Location", feed.getLinks().getSelf());
                try {
                    resp.getOutputStream().print(feed.asLimitedJSONObject().toString());
                } catch (IOException ioe) {
                    eventlogger.error("PROV0113 DRFeedServlet.doPost " + ioe.getMessage(), ioe);
                }
                provisioningDataChanged();
            } else {
                // Something went wrong with the INSERT
                elr.setResult(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
                eventlogger.error(elr.toString());
                sendResponseError(resp, HttpServletResponse.SC_INTERNAL_SERVER_ERROR, DB_PROBLEM_MSG, eventlogger);
            }
        } finally {
            eelfLogger.info(EelfMsgs.EXIT);
        }
    }
}