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/*
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* Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
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*
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* Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
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* Version 2.0 (the "License"); you may not use this file except
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* in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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package io.entgra.device.mgt.core.ui.request.interceptor;
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import com.google.gson.Gson;
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import com.google.gson.JsonElement;
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import com.google.gson.JsonObject;
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import com.google.gson.JsonParser;
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import io.entgra.device.mgt.core.ui.request.interceptor.beans.AuthData;
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import io.entgra.device.mgt.core.ui.request.interceptor.util.HandlerConstants;
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import io.entgra.device.mgt.core.ui.request.interceptor.util.HandlerUtil;
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import org.apache.commons.lang.StringUtils;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.http.HttpHeaders;
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import org.apache.http.HttpStatus;
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import org.apache.http.client.methods.HttpGet;
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import org.apache.http.client.utils.URIBuilder;
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import org.apache.http.entity.ContentType;
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import io.entgra.device.mgt.core.ui.request.interceptor.beans.ProxyResponse;
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import javax.servlet.annotation.MultipartConfig;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpSession;
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import java.io.IOException;
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@MultipartConfig
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@WebServlet("/default-oauth2-credentials")
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public class DefaultOauth2TokenHandler extends HttpServlet {
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private static final Log log = LogFactory.getLog(DefaultTokenHandler.class);
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) {
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try {
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HttpSession httpSession = req.getSession(false);
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if (httpSession != null) {
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AuthData authData = (AuthData) httpSession.getAttribute(HandlerConstants.SESSION_AUTH_DATA_KEY);
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if (authData == null) {
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HandlerUtil.sendUnAuthorizeResponse(resp);
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return;
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}
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AuthData defaultAuthData = (AuthData) httpSession
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.getAttribute(HandlerConstants.SESSION_DEFAULT_AUTH_DATA_KEY);
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if (defaultAuthData != null) {
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HandlerUtil.handleSuccess(resp, constructSuccessProxyResponse(defaultAuthData.getAccessToken()));
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return;
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}
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String clientId = authData.getClientId();
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String clientSecret = authData.getClientSecret();
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String queryString = req.getQueryString();
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String scopeString = "";
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if (StringUtils.isNotEmpty(queryString)) {
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scopeString = req.getParameter("scopes");
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if (scopeString != null) {
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scopeString = "?scopes=" + scopeString;
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}
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}
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String iotsCoreUrl = req.getScheme() + HandlerConstants.SCHEME_SEPARATOR
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+ System.getProperty(HandlerConstants.IOT_GW_HOST_ENV_VAR)
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+ HandlerConstants.COLON + HandlerUtil.getGatewayPort(req.getScheme());
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String tokenUrl = iotsCoreUrl + "/api/device-mgt/v1.0/devices/" + clientId
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+ "/" + clientSecret + "/default-token" + scopeString;
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HttpGet defaultTokenRequest = new HttpGet(tokenUrl);
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defaultTokenRequest
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.setHeader(HttpHeaders.AUTHORIZATION, HandlerConstants.BEARER + authData.getAccessToken());
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defaultTokenRequest
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.setHeader(HttpHeaders.CONTENT_TYPE, ContentType.APPLICATION_FORM_URLENCODED.toString());
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ProxyResponse tokenResultResponse = HandlerUtil.execute(defaultTokenRequest);
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if (tokenResultResponse.getExecutorResponse().contains(HandlerConstants.EXECUTOR_EXCEPTION_PREFIX)) {
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log.error("Error occurred while invoking the API to get default token data.");
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HandlerUtil.handleError(resp, tokenResultResponse);
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return;
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}
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String tokenResult = tokenResultResponse.getData();
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if (tokenResult == null) {
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log.error("Invalid default token response is received.");
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HandlerUtil.handleError(resp, tokenResultResponse);
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return;
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}
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JsonParser jsonParser = new JsonParser();
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JsonElement jTokenResult = jsonParser.parse(tokenResult);
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if (jTokenResult.isJsonObject()) {
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JsonObject jTokenResultAsJsonObject = jTokenResult.getAsJsonObject();
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AuthData newDefaultAuthData = new AuthData();
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newDefaultAuthData.setClientId(clientId);
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newDefaultAuthData.setClientSecret(clientSecret);
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String defaultToken = jTokenResultAsJsonObject.get("accessToken").getAsString();
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newDefaultAuthData.setAccessToken(defaultToken);
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newDefaultAuthData.setRefreshToken(jTokenResultAsJsonObject.get("refreshToken").getAsString());
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newDefaultAuthData.setScope(jTokenResultAsJsonObject.get("scopes").getAsString());
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httpSession.setAttribute(HandlerConstants.SESSION_DEFAULT_AUTH_DATA_KEY, newDefaultAuthData);
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HandlerUtil.handleSuccess(resp, constructSuccessProxyResponse(defaultToken));
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}
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} else {
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HandlerUtil.sendUnAuthorizeResponse(resp);
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}
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} catch (IOException e) {
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log.error("Error occurred when processing GET request to get default token.", e);
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}
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}
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/**
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* Get Success Proxy Response
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* @param defaultAccessToken Access token which has default scope
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* @return {@link ProxyResponse}
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*/
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private ProxyResponse constructSuccessProxyResponse (String defaultAccessToken) {
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URIBuilder ub = new URIBuilder();
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ub.setScheme(HandlerConstants.WSS_PROTOCOL);
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ub.setHost(System.getProperty(HandlerConstants.IOT_REMOTE_SESSION_HOST_ENV_VAR));
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ub.setPort(Integer.parseInt(System.getProperty(HandlerConstants.IOT_REMOTE_SESSION_HTTPS_PORT_ENV_VAR)));
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ub.setPath(HandlerConstants.REMOTE_SESSION_CONTEXT);
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URIBuilder ub2 = new URIBuilder();
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ub2.setScheme(HandlerConstants.WSS_PROTOCOL);
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ub2.setHost(System.getProperty(HandlerConstants.IOT_GW_HOST_ENV_VAR));
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ub2.setPort(Integer.parseInt(System.getProperty(HandlerConstants.IOT_GATEWAY_WEBSOCKET_WSS_PORT_ENV_VAR)));
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URIBuilder ub3 = new URIBuilder();
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ub3.setScheme(HandlerConstants.WS_PROTOCOL);
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ub3.setHost(System.getProperty(HandlerConstants.IOT_GW_HOST_ENV_VAR));
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ub3.setPort(Integer.parseInt(System.getProperty(HandlerConstants.IOT_GATEWAY_WEBSOCKET_WS_PORT_ENV_VAR)));
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JsonObject responseJsonObj = new JsonObject();
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responseJsonObj.addProperty("default-access-token", defaultAccessToken);
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responseJsonObj.addProperty("remote-session-base-url", ub.toString());
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responseJsonObj.addProperty("secured-websocket-gateway-url", ub2.toString());
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responseJsonObj.addProperty("unsecured-websocket-gateway-url", ub3.toString());
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Gson gson = new Gson();
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String payload = gson.toJson(responseJsonObj);
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ProxyResponse proxyResponse = new ProxyResponse();
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proxyResponse.setCode(HttpStatus.SC_OK);
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proxyResponse.setStatus(ProxyResponse.Status.SUCCESS);
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proxyResponse.setData(payload);
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return proxyResponse;
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}
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}
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