From 0a2836c59942a49b5d607ba639f114b488b040a6 Mon Sep 17 00:00:00 2001 From: "tcdlpds@gmail.com" Date: Tue, 11 Aug 2020 13:32:17 +0530 Subject: [PATCH] Add OTP invoker --- .../interceptor/OTPInvokerHandler.java | 270 ++++++++++++++++++ .../interceptor/util/HandlerConstants.java | 2 + .../request/interceptor/util/HandlerUtil.java | 33 ++- 3 files changed, 304 insertions(+), 1 deletion(-) create mode 100644 components/ui-request-interceptor/io.entgra.ui.request.interceptor/src/main/java/io/entgra/ui/request/interceptor/OTPInvokerHandler.java diff --git a/components/ui-request-interceptor/io.entgra.ui.request.interceptor/src/main/java/io/entgra/ui/request/interceptor/OTPInvokerHandler.java b/components/ui-request-interceptor/io.entgra.ui.request.interceptor/src/main/java/io/entgra/ui/request/interceptor/OTPInvokerHandler.java new file mode 100644 index 0000000000..1378f5af4c --- /dev/null +++ b/components/ui-request-interceptor/io.entgra.ui.request.interceptor/src/main/java/io/entgra/ui/request/interceptor/OTPInvokerHandler.java @@ -0,0 +1,270 @@ +/* + * Copyright (c) 2020, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved. + * + * Entgra (Pvt) Ltd. 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 io.entgra.ui.request.interceptor; + +import io.entgra.ui.request.interceptor.util.HandlerConstants; +import io.entgra.ui.request.interceptor.util.HandlerUtil; +import org.apache.commons.fileupload.FileItem; +import org.apache.commons.fileupload.FileUploadException; +import org.apache.commons.fileupload.disk.DiskFileItemFactory; +import org.apache.commons.fileupload.servlet.ServletFileUpload; +import org.apache.commons.lang.StringUtils; +import org.apache.commons.logging.Log; +import org.apache.commons.logging.LogFactory; +import org.apache.http.HttpHeaders; +import org.apache.http.HttpStatus; +import org.apache.http.client.methods.HttpDelete; +import org.apache.http.client.methods.HttpEntityEnclosingRequestBase; +import org.apache.http.client.methods.HttpGet; +import org.apache.http.client.methods.HttpHead; +import org.apache.http.client.methods.HttpPost; +import org.apache.http.client.methods.HttpPut; +import org.apache.http.client.methods.HttpRequestBase; +import org.apache.http.cookie.SM; +import org.apache.http.entity.ContentType; +import org.apache.http.entity.InputStreamEntity; +import org.apache.http.entity.mime.HttpMultipartMode; +import org.apache.http.entity.mime.MultipartEntityBuilder; +import org.apache.http.entity.mime.content.InputStreamBody; +import org.wso2.carbon.device.application.mgt.common.ProxyResponse; + +import javax.servlet.annotation.WebServlet; +import javax.servlet.http.HttpServlet; +import javax.servlet.http.HttpServletRequest; +import javax.servlet.http.HttpServletResponse; +import java.io.IOException; +import java.util.Enumeration; +import java.util.List; + +@WebServlet( + name = "RequestHandlerServlet", + description = "This servlet intercepts the otp-api requests initiated from the user interface and validate " + + "before forwarding to the backend", + urlPatterns = { + "/otp-invoke/*" + } +) +public class OTPInvokerHandler extends HttpServlet { + private static final Log log = LogFactory.getLog(OTPInvokerHandler.class); + private static final long serialVersionUID = 3109569827313066220L; + private static String apiEndpoint; + + @Override + protected void doPost(HttpServletRequest req, HttpServletResponse resp) { + try { + if (validateRequest(req, resp)) { + HttpPost postRequest = new HttpPost(HandlerUtil.generateBackendRequestURL(req, apiEndpoint)); + generateRequestEntity(req, postRequest); + ProxyResponse proxyResponse = HandlerUtil.execute(postRequest); + + if (proxyResponse.getExecutorResponse().contains(HandlerConstants.EXECUTOR_EXCEPTION_PREFIX)) { + log.error("Error occurred while invoking the POST API endpoint."); + HandlerUtil.handleError(resp, proxyResponse); + return; + } + HandlerUtil.handleSuccess(resp, proxyResponse); + } + } catch (FileUploadException e) { + log.error("Error occurred when processing Multipart POST request.", e); + } catch (IOException e) { + log.error("Error occurred when processing POST request.", e); + } + } + + @Override + protected void doGet(HttpServletRequest req, HttpServletResponse resp) { + try { + if (validateRequest(req, resp)) { + HttpGet getRequest = new HttpGet(HandlerUtil.generateBackendRequestURL(req, apiEndpoint)); + copyRequestHeaders(req, getRequest, false); + ProxyResponse proxyResponse = HandlerUtil.execute(getRequest); + + if (proxyResponse.getExecutorResponse().contains(HandlerConstants.EXECUTOR_EXCEPTION_PREFIX)) { + log.error("Error occurred while invoking the GET API endpoint."); + HandlerUtil.handleError(resp, proxyResponse); + return; + } + HandlerUtil.handleSuccess(resp, proxyResponse); + } + } catch (IOException e) { + log.error("Error occurred when processing GET request.", e); + } + } + + @Override + protected void doHead(HttpServletRequest req, HttpServletResponse resp) { + try { + if (validateRequest(req, resp)) { + HttpHead headRequest = new HttpHead(HandlerUtil.generateBackendRequestURL(req, apiEndpoint)); + copyRequestHeaders(req, headRequest, false); + ProxyResponse proxyResponse = HandlerUtil.execute(headRequest); + + if (proxyResponse.getExecutorResponse().contains(HandlerConstants.EXECUTOR_EXCEPTION_PREFIX)) { + log.error("Error occurred while invoking the HEAD API endpoint."); + HandlerUtil.handleError(resp, proxyResponse); + return; + } + HandlerUtil.handleSuccess(resp, proxyResponse); + } + } catch (IOException e) { + log.error("Error occurred when processing HEAD request.", e); + } + } + + @Override + protected void doPut(HttpServletRequest req, HttpServletResponse resp) { + try { + if (validateRequest(req, resp)) { + HttpPut putRequest = new HttpPut(HandlerUtil.generateBackendRequestURL(req, apiEndpoint)); + generateRequestEntity(req, putRequest); + ProxyResponse proxyResponse = HandlerUtil.execute(putRequest); + + if (proxyResponse.getExecutorResponse().contains(HandlerConstants.EXECUTOR_EXCEPTION_PREFIX)) { + log.error("Error occurred while invoking the PUT API endpoint."); + HandlerUtil.handleError(resp, proxyResponse); + return; + } + HandlerUtil.handleSuccess(resp, proxyResponse); + } + } catch (FileUploadException e) { + log.error("Error occurred when processing Multipart PUT request.", e); + } catch (IOException e) { + log.error("Error occurred when processing PUT request.", e); + } + } + + @Override + protected void doDelete(HttpServletRequest req, HttpServletResponse resp) { + try { + if (validateRequest(req, resp)) { + HttpDelete deleteRequest = new HttpDelete(HandlerUtil.generateBackendRequestURL(req, apiEndpoint)); + copyRequestHeaders(req, deleteRequest, false); + ProxyResponse proxyResponse = HandlerUtil.execute(deleteRequest); + + if (proxyResponse.getExecutorResponse().contains(HandlerConstants.EXECUTOR_EXCEPTION_PREFIX)) { + log.error("Error occurred while invoking the DELETE API endpoint."); + HandlerUtil.handleError(resp, proxyResponse); + return; + } + HandlerUtil.handleSuccess(resp, proxyResponse); + } + } catch (IOException e) { + log.error("Error occurred when processing DELETE request.", e); + } + } + + /** + * Generate te request entity for POST and PUT requests from the incoming request. + * + * @param req incoming {@link HttpServletRequest}. + * @param proxyRequest proxy request instance. + * @throws FileUploadException If unable to parse the incoming request for multipart content extraction. + * @throws IOException If error occurred while generating the request body. + */ + private void generateRequestEntity(HttpServletRequest req, HttpEntityEnclosingRequestBase proxyRequest) + throws FileUploadException, IOException { + if (ServletFileUpload.isMultipartContent(req)) { + ServletFileUpload servletFileUpload = new ServletFileUpload(new DiskFileItemFactory()); + List fileItemList = servletFileUpload.parseRequest(req); + MultipartEntityBuilder entityBuilder = MultipartEntityBuilder.create(); + entityBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE); + for (FileItem item: fileItemList) { + if (!item.isFormField()) { + entityBuilder.addPart(item.getFieldName(), new InputStreamBody(item.getInputStream(), + ContentType.create(item.getContentType()), item.getName())); + } else { + entityBuilder.addTextBody(item.getFieldName(), item.getString()); + } + } + proxyRequest.setEntity(entityBuilder.build()); + copyRequestHeaders(req, proxyRequest, false); + } else { + if (StringUtils.isNotEmpty(req.getHeader(HttpHeaders.CONTENT_LENGTH)) || + StringUtils.isNotEmpty(req.getHeader(HttpHeaders.TRANSFER_ENCODING))) { + InputStreamEntity entity = new InputStreamEntity(req.getInputStream(), + Long.parseLong(req.getHeader(HttpHeaders.CONTENT_LENGTH))); + proxyRequest.setEntity(entity); + } + copyRequestHeaders(req, proxyRequest, true); + } + } + + /** + * Copy incoming request headers to the proxy request. + * + * @param req incoming {@link HttpServletRequest} + * @param httpRequest proxy request instance. + * @param preserveContentType true if content type header needs to be preserved. + * This should be set to false when handling multipart requests as Http + * client will generate the Content-Type header automatically. + */ + private void copyRequestHeaders(HttpServletRequest req, HttpRequestBase httpRequest, boolean preserveContentType) { + Enumeration headerNames = req.getHeaderNames(); + while (headerNames.hasMoreElements()) { + String headerName = headerNames.nextElement(); + if (headerName.equalsIgnoreCase(HttpHeaders.CONTENT_LENGTH) || + headerName.equalsIgnoreCase(SM.COOKIE) || + (!preserveContentType && headerName.equalsIgnoreCase(HttpHeaders.CONTENT_TYPE))) { + continue; + } + Enumeration headerValues = req.getHeaders(headerName); + while (headerValues.hasMoreElements()) { + httpRequest.setHeader(headerName, headerValues.nextElement()); + } + } + } + + /*** + * Validates the incoming request. + * + * @param req {@link HttpServletRequest} + * @param resp {@link HttpServletResponse} + * @return If request is a valid one, returns TRUE, otherwise return FALSE + * @throws IOException If and error occurs while witting error response to client side + */ + private static boolean validateRequest(HttpServletRequest req, HttpServletResponse resp) + throws IOException { + String schema = req.getScheme(); + apiEndpoint = schema + HandlerConstants.SCHEME_SEPARATOR + System.getProperty("iot.core.host") + + HandlerConstants.COLON + HandlerUtil.getCorePort(schema); + + if (StringUtils.isBlank(req.getHeader(HandlerConstants.OTP_HEADER))) { + log.error("Unauthorized, Please provide OTP token."); + handleError(resp, HttpStatus.SC_UNAUTHORIZED); + return false; + } + return true; + } + + /** + * Handle error requests + * + * @param resp {@link HttpServletResponse} + * @param errorCode HTTP error status code + * @throws IOException If error occurred when trying to send the error response. + */ + private static void handleError(HttpServletResponse resp, int errorCode) + throws IOException { + ProxyResponse proxyResponse = new ProxyResponse(); + proxyResponse.setCode(errorCode); + proxyResponse.setExecutorResponse( + HandlerConstants.EXECUTOR_EXCEPTION_PREFIX + HandlerUtil.getStatusKey(errorCode)); + HandlerUtil.handleError(resp, proxyResponse); + } +} diff --git a/components/ui-request-interceptor/io.entgra.ui.request.interceptor/src/main/java/io/entgra/ui/request/interceptor/util/HandlerConstants.java b/components/ui-request-interceptor/io.entgra.ui.request.interceptor/src/main/java/io/entgra/ui/request/interceptor/util/HandlerConstants.java index a335f224c7..b691eaa315 100644 --- a/components/ui-request-interceptor/io.entgra.ui.request.interceptor/src/main/java/io/entgra/ui/request/interceptor/util/HandlerConstants.java +++ b/components/ui-request-interceptor/io.entgra.ui.request.interceptor/src/main/java/io/entgra/ui/request/interceptor/util/HandlerConstants.java @@ -47,4 +47,6 @@ public class HandlerConstants { public static final int INTERNAL_ERROR_CODE = 500; public static final long TIMEOUT = 1200; + + public static final String OTP_HEADER = "one-time-token"; } diff --git a/components/ui-request-interceptor/io.entgra.ui.request.interceptor/src/main/java/io/entgra/ui/request/interceptor/util/HandlerUtil.java b/components/ui-request-interceptor/io.entgra.ui.request.interceptor/src/main/java/io/entgra/ui/request/interceptor/util/HandlerUtil.java index 82685daa43..592806f338 100644 --- a/components/ui-request-interceptor/io.entgra.ui.request.interceptor/src/main/java/io/entgra/ui/request/interceptor/util/HandlerUtil.java +++ b/components/ui-request-interceptor/io.entgra.ui.request.interceptor/src/main/java/io/entgra/ui/request/interceptor/util/HandlerUtil.java @@ -34,6 +34,7 @@ import org.json.JSONException; import org.json.JSONObject; import org.wso2.carbon.device.application.mgt.common.ProxyResponse; +import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.BufferedReader; import java.io.IOException; @@ -203,7 +204,7 @@ public class HandlerUtil { } /** - * Get gatway port according to request recieved scheme + * Get gateway port according to request received scheme * @param scheme https or https * @return {@link String} gateway port */ @@ -215,6 +216,19 @@ public class HandlerUtil { return gatewayPort; } + /** + * Get core port according to request received scheme + * @param scheme https or https + * @return {@link String} gateway port + */ + public static String getCorePort(String scheme) { + String productCorePort = System.getProperty("iot.core.https.port"); + if (HandlerConstants.HTTP_PROTOCOL.equals(scheme)) { + productCorePort = System.getProperty("iot.core.https.por"); + } + return productCorePort; + } + /** * Retrieve Http client based on hostname verification. * @return {@link CloseableHttpClient} http client @@ -242,4 +256,21 @@ public class HandlerUtil { HandlerConstants.EXECUTOR_EXCEPTION_PREFIX + HandlerUtil.getStatusKey(HttpStatus.SC_UNAUTHORIZED)); handleError(resp, proxyResponse); } + + /** + * Generates the target URL for the proxy request. + * + * @param req incoming {@link HttpServletRequest} + * @param apiEndpoint API Endpoint URL + * @return Target URL + */ + public static String generateBackendRequestURL(HttpServletRequest req, String apiEndpoint) { + StringBuilder urlBuilder = new StringBuilder(); + urlBuilder.append(apiEndpoint).append(HandlerConstants.API_COMMON_CONTEXT) + .append(req.getPathInfo().replace(" ", "%20")); + if (StringUtils.isNotEmpty(req.getQueryString())) { + urlBuilder.append("?").append(req.getQueryString()); + } + return urlBuilder.toString(); + } }