Add OTP invoker

revert-70ac1926
tcdlpds@gmail.com 4 years ago
parent 33c56dcd4f
commit 0a2836c599

@ -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<FileItem> 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 <code>true</code> if content type header needs to be preserved.
* This should be set to <code>false</code> when handling multipart requests as Http
* client will generate the Content-Type header automatically.
*/
private void copyRequestHeaders(HttpServletRequest req, HttpRequestBase httpRequest, boolean preserveContentType) {
Enumeration<String> 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<String> 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);
}
}

@ -47,4 +47,6 @@ public class HandlerConstants {
public static final int INTERNAL_ERROR_CODE = 500; public static final int INTERNAL_ERROR_CODE = 500;
public static final long TIMEOUT = 1200; public static final long TIMEOUT = 1200;
public static final String OTP_HEADER = "one-time-token";
} }

@ -34,6 +34,7 @@ import org.json.JSONException;
import org.json.JSONObject; import org.json.JSONObject;
import org.wso2.carbon.device.application.mgt.common.ProxyResponse; import org.wso2.carbon.device.application.mgt.common.ProxyResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpServletResponse;
import java.io.BufferedReader; import java.io.BufferedReader;
import java.io.IOException; 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 * @param scheme https or https
* @return {@link String} gateway port * @return {@link String} gateway port
*/ */
@ -215,6 +216,19 @@ public class HandlerUtil {
return gatewayPort; 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. * Retrieve Http client based on hostname verification.
* @return {@link CloseableHttpClient} http client * @return {@link CloseableHttpClient} http client
@ -242,4 +256,21 @@ public class HandlerUtil {
HandlerConstants.EXECUTOR_EXCEPTION_PREFIX + HandlerUtil.getStatusKey(HttpStatus.SC_UNAUTHORIZED)); HandlerConstants.EXECUTOR_EXCEPTION_PREFIX + HandlerUtil.getStatusKey(HttpStatus.SC_UNAUTHORIZED));
handleError(resp, proxyResponse); 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();
}
} }

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