Java tutorial
/******************************************************************************* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF 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.apache.ofbiz.common; import java.awt.Color; import java.awt.Font; import java.awt.FontMetrics; import java.awt.Graphics2D; import java.awt.geom.AffineTransform; import java.awt.image.BufferedImage; import java.io.IOException; import java.io.PrintWriter; import java.io.UnsupportedEncodingException; import java.io.Writer; import java.util.ArrayList; import java.util.HashMap; import java.util.LinkedHashMap; import java.util.List; import java.util.Locale; import java.util.Map; import java.util.Set; import javax.imageio.ImageIO; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.commons.lang.RandomStringUtils; import org.apache.commons.lang.StringUtils; import org.apache.ofbiz.base.lang.JSON; import org.apache.ofbiz.base.util.Debug; import org.apache.ofbiz.base.util.StringUtil; import org.apache.ofbiz.base.util.UtilGenerics; import org.apache.ofbiz.base.util.UtilHttp; import org.apache.ofbiz.base.util.UtilMisc; import org.apache.ofbiz.base.util.UtilProperties; import org.apache.ofbiz.base.util.UtilValidate; import org.apache.ofbiz.base.util.cache.UtilCache; import org.apache.ofbiz.entity.Delegator; import org.apache.ofbiz.entity.GenericEntityException; import org.apache.ofbiz.entity.GenericValue; import org.apache.ofbiz.entity.util.EntityQuery; import org.apache.ofbiz.entity.util.EntityUtilProperties; import org.apache.ofbiz.security.Security; /** * Common Services */ public class CommonEvents { public static final String module = CommonEvents.class.getName(); private static final String[] ignoreAttrs = new String[] { // Attributes removed for security reason; _ERROR_MESSAGE_ is kept "javax.servlet.request.key_size", "_CONTEXT_ROOT_", "_FORWARDED_FROM_SERVLET_", "javax.servlet.request.ssl_session", "javax.servlet.request.ssl_session_id", "multiPartMap", "javax.servlet.request.cipher_suite", "targetRequestUri", "_SERVER_ROOT_URL_", "_CONTROL_PATH_", "thisRequestUri" }; private static final UtilCache<String, Map<String, String>> appletSessions = UtilCache .createUtilCache("AppletSessions", 0, 600000, true); public static String checkAppletRequest(HttpServletRequest request, HttpServletResponse response) { Delegator delegator = (Delegator) request.getAttribute("delegator"); String sessionId = request.getParameter("sessionId"); String visitId = request.getParameter("visitId"); sessionId = sessionId.trim(); visitId = visitId.trim(); String responseString = ""; GenericValue visit = null; try { visit = EntityQuery.use(delegator).from("Visit").where("visitId", visitId).queryOne(); } catch (GenericEntityException e) { Debug.logError(e, "Cannot Visit Object", module); } if (visit != null && visit.getString("sessionId").equals(sessionId) && appletSessions.containsKey(sessionId)) { Map<String, String> sessionMap = appletSessions.get(sessionId); if (sessionMap != null && sessionMap.containsKey("followPage")) responseString = sessionMap.remove("followPage"); } try { PrintWriter out = response.getWriter(); response.setContentType("text/plain"); out.println(responseString); out.close(); } catch (IOException e) { Debug.logError(e, "Problems writing servlet output!", module); } return "success"; } public static String receiveAppletRequest(HttpServletRequest request, HttpServletResponse response) { Delegator delegator = (Delegator) request.getAttribute("delegator"); String sessionId = request.getParameter("sessionId"); String visitId = request.getParameter("visitId"); sessionId = sessionId.trim(); visitId = visitId.trim(); String responseString = "ERROR"; GenericValue visit = null; try { visit = EntityQuery.use(delegator).from("Visit").where("visitId", visitId).queryOne(); } catch (GenericEntityException e) { Debug.logError(e, "Cannot Visit Object", module); } if (visit.getString("sessionId").equals(sessionId)) { String currentPage = request.getParameter("currentPage"); Map<String, String> sessionMap = appletSessions.get(sessionId); if (sessionMap != null) { String followers = sessionMap.get("followers"); List<String> folList = StringUtil.split(followers, ","); for (String follower : folList) { Map<String, String> folSesMap = UtilMisc.toMap("followPage", currentPage); appletSessions.put(follower, folSesMap); } } responseString = "OK"; } try { PrintWriter out = response.getWriter(); response.setContentType("text/plain"); out.println(responseString); out.close(); } catch (IOException e) { Debug.logError(e, "Problems writing servlet output!", module); } return "success"; } public static String setAppletFollower(HttpServletRequest request, HttpServletResponse response) { Security security = (Security) request.getAttribute("security"); GenericValue userLogin = (GenericValue) request.getSession().getAttribute("userLogin"); String visitId = request.getParameter("visitId"); if (visitId != null) request.setAttribute("visitId", visitId); if (security.hasPermission("SEND_CONTROL_APPLET", userLogin)) { String followerSessionId = request.getParameter("followerSid"); String followSessionId = request.getParameter("followSid"); Map<String, String> follow = appletSessions.get(followSessionId); if (follow == null) follow = new LinkedHashMap<String, String>(); String followerListStr = follow.get("followers"); if (followerListStr == null) { followerListStr = followerSessionId; } else { followerListStr = followerListStr + "," + followerSessionId; } appletSessions.put(followSessionId, follow); appletSessions.put(followerSessionId, null); } return "success"; } public static String setFollowerPage(HttpServletRequest request, HttpServletResponse response) { Security security = (Security) request.getAttribute("security"); GenericValue userLogin = (GenericValue) request.getSession().getAttribute("userLogin"); String visitId = request.getParameter("visitId"); if (visitId != null) request.setAttribute("visitId", visitId); if (security.hasPermission("SEND_CONTROL_APPLET", userLogin)) { String followerSessionId = request.getParameter("followerSid"); String pageUrl = request.getParameter("pageUrl"); Map<String, String> follow = appletSessions.get(followerSessionId); if (follow == null) follow = new LinkedHashMap<String, String>(); follow.put("followPage", pageUrl); appletSessions.put(followerSessionId, follow); } return "success"; } /** Simple event to set the users per-session locale setting. The user's locale * setting should be passed as a "newLocale" request parameter. */ public static String setSessionLocale(HttpServletRequest request, HttpServletResponse response) { String localeString = request.getParameter("newLocale"); if (UtilValidate.isNotEmpty(localeString)) { UtilHttp.setLocale(request, localeString); // update the UserLogin object GenericValue userLogin = (GenericValue) request.getSession().getAttribute("userLogin"); if (userLogin == null) { userLogin = (GenericValue) request.getSession().getAttribute("autoUserLogin"); } if (userLogin != null) { GenericValue ulUpdate = GenericValue.create(userLogin); ulUpdate.set("lastLocale", localeString); try { ulUpdate.store(); userLogin.refreshFromCache(); } catch (GenericEntityException e) { Debug.logWarning(e, module); } } } return "success"; } /** Simple event to set the user's per-session time zone setting. */ public static String setSessionTimeZone(HttpServletRequest request, HttpServletResponse response) { String tzString = request.getParameter("tzId"); if (UtilValidate.isNotEmpty(tzString)) { UtilHttp.setTimeZone(request, tzString); // update the UserLogin object GenericValue userLogin = (GenericValue) request.getSession().getAttribute("userLogin"); if (userLogin == null) { userLogin = (GenericValue) request.getSession().getAttribute("autoUserLogin"); } if (userLogin != null) { GenericValue ulUpdate = GenericValue.create(userLogin); ulUpdate.set("lastTimeZone", tzString); try { ulUpdate.store(); userLogin.refreshFromCache(); } catch (GenericEntityException e) { Debug.logWarning(e, module); } } } return "success"; } /** Simple event to set the users per-session currency uom value */ public static String setSessionCurrencyUom(HttpServletRequest request, HttpServletResponse response) { String currencyUom = request.getParameter("currencyUom"); if (UtilValidate.isNotEmpty(currencyUom)) { // update the session UtilHttp.setCurrencyUom(request.getSession(), currencyUom); // update the UserLogin object GenericValue userLogin = (GenericValue) request.getSession().getAttribute("userLogin"); if (userLogin == null) { userLogin = (GenericValue) request.getSession().getAttribute("autoUserLogin"); } if (userLogin != null) { GenericValue ulUpdate = GenericValue.create(userLogin); ulUpdate.set("lastCurrencyUom", currencyUom); try { ulUpdate.store(); userLogin.refreshFromCache(); } catch (GenericEntityException e) { Debug.logWarning(e, module); } } } return "success"; } public static String jsonResponseFromRequestAttributes(HttpServletRequest request, HttpServletResponse response) { // pull out the service response from the request attribute Map<String, Object> attrMap = UtilHttp.getJSONAttributeMap(request); for (String ignoreAttr : ignoreAttrs) { if (attrMap.containsKey(ignoreAttr)) { attrMap.remove(ignoreAttr); } } try { JSON json = JSON.from(attrMap); writeJSONtoResponse(json, request.getMethod(), response); } catch (Exception e) { return "error"; } return "success"; } private static void writeJSONtoResponse(JSON json, String httpMethod, HttpServletResponse response) throws UnsupportedEncodingException { String jsonStr = json.toString(); if (jsonStr == null) { Debug.logError("JSON Object was empty; fatal error!", module); return; } // This was added for security reason (OFBIZ-5409), you might need to remove the "//" prefix when handling the JSON response // Though normally you simply have to access the data you want, so should not be annoyed by the "//" prefix if ("GET".equalsIgnoreCase(httpMethod)) { Debug.logWarning( "for security reason (OFBIZ-5409) the the '//' prefix was added handling the JSON response. " + "Normally you simply have to access the data you want, so should not be annoyed by the '//' prefix." + "You might need to remove it if you use Ajax GET responses (not recommended)." + "In case, the util.js scrpt is there to help you", module); jsonStr = "//" + jsonStr; } // set the JSON content type response.setContentType("application/json"); // jsonStr.length is not reliable for unicode characters response.setContentLength(jsonStr.getBytes("UTF8").length); // return the JSON String Writer out; try { out = response.getWriter(); out.write(jsonStr); out.flush(); } catch (IOException e) { Debug.logError(e, module); } } public static String getJSONuiLabelArray(HttpServletRequest request, HttpServletResponse response) throws UnsupportedEncodingException, IOException { // Format - {resource1 : [key1, key2 ...], resource2 : [key1, key2, ...], ...} String jsonString = request.getParameter("requiredLabels"); Map<String, List<String>> uiLabelObject = null; if (UtilValidate.isNotEmpty(jsonString)) { JSON json = JSON.from(jsonString); uiLabelObject = UtilGenerics.<Map<String, List<String>>>cast(json.toObject(Map.class)); } if (UtilValidate.isEmpty(uiLabelObject)) { Debug.logError("No resource and labels found in JSON string: " + jsonString, module); return "error"; } Locale locale = UtilHttp.getLocale(request); Map<String, List<String>> uiLabelMap = new HashMap<String, List<String>>(); Set<Map.Entry<String, List<String>>> entrySet = uiLabelObject.entrySet(); for (Map.Entry<String, List<String>> entry : entrySet) { String resource = entry.getKey(); List<String> resourceKeys = entry.getValue(); if (resourceKeys != null) { List<String> labels = new ArrayList<String>(resourceKeys.size()); for (String resourceKey : resourceKeys) { String label = UtilProperties.getMessage(resource, resourceKey, locale); labels.add(label); } uiLabelMap.put(resource, labels); } } writeJSONtoResponse(JSON.from(uiLabelMap), request.getMethod(), response); return "success"; } public static String getJSONuiLabel(HttpServletRequest request, HttpServletResponse response) throws UnsupportedEncodingException, IOException { // Format - {resource : key} String jsonString = request.getParameter("requiredLabel"); Map<String, String> uiLabelObject = null; if (UtilValidate.isNotEmpty(jsonString)) { JSON json = JSON.from(jsonString); uiLabelObject = UtilGenerics.<Map<String, String>>cast(json.toObject(Map.class)); } if (UtilValidate.isEmpty(uiLabelObject)) { Debug.logError("No resource and labels found in JSON string: " + jsonString, module); return "error"; } else if (uiLabelObject.size() > 1) { Debug.logError("More than one resource found, please use the method: getJSONuiLabelArray", module); return "error"; } Locale locale = UtilHttp.getLocale(request); Map<String, String> uiLabelMap = new HashMap<String, String>(); Set<Map.Entry<String, String>> entrySet = uiLabelObject.entrySet(); for (Map.Entry<String, String> entry : entrySet) { String resource = entry.getKey(); String resourceKey = entry.getValue(); if (resourceKey != null) { String label = UtilProperties.getMessage(resource, resourceKey, locale); uiLabelMap.put(resource, label); } } writeJSONtoResponse(JSON.from(uiLabelMap), request.getMethod(), response); return "success"; } public static String getCaptcha(HttpServletRequest request, HttpServletResponse response) { try { Delegator delegator = (Delegator) request.getAttribute("delegator"); final String captchaSizeConfigName = StringUtils.defaultIfEmpty(request.getParameter("captchaSize"), "default"); final String captchaSizeConfig = EntityUtilProperties.getPropertyValue("captcha", "captcha." + captchaSizeConfigName, delegator); final String[] captchaSizeConfigs = captchaSizeConfig.split("\\|"); final String captchaCodeId = StringUtils.defaultIfEmpty(request.getParameter("captchaCodeId"), ""); // this is used to uniquely identify in the user session the attribute where the captcha code for the last captcha for the form is stored final int fontSize = Integer.parseInt(captchaSizeConfigs[0]); final int height = Integer.parseInt(captchaSizeConfigs[1]); final int width = Integer.parseInt(captchaSizeConfigs[2]); final int charsToPrint = UtilProperties.getPropertyAsInteger("captcha", "captcha.code_length", 6); final char[] availableChars = EntityUtilProperties .getPropertyValue("captcha", "captcha.characters", delegator).toCharArray(); //It is possible to pass the font size, image width and height with the request as well Color backgroundColor = Color.gray; Color borderColor = Color.DARK_GRAY; Color textColor = Color.ORANGE; Color circleColor = new Color(160, 160, 160); Font textFont = new Font("Arial", Font.PLAIN, fontSize); int circlesToDraw = 6; float horizMargin = 20.0f; double rotationRange = 0.7; // in radians BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = (Graphics2D) bufferedImage.getGraphics(); g.setColor(backgroundColor); g.fillRect(0, 0, width, height); //Generating some circles for background noise g.setColor(circleColor); for (int i = 0; i < circlesToDraw; i++) { int circleRadius = (int) (Math.random() * height / 2.0); int circleX = (int) (Math.random() * width - circleRadius); int circleY = (int) (Math.random() * height - circleRadius); g.drawOval(circleX, circleY, circleRadius * 2, circleRadius * 2); } g.setColor(textColor); g.setFont(textFont); FontMetrics fontMetrics = g.getFontMetrics(); int maxAdvance = fontMetrics.getMaxAdvance(); int fontHeight = fontMetrics.getHeight(); String captchaCode = RandomStringUtils.random(6, availableChars); float spaceForLetters = -horizMargin * 2 + width; float spacePerChar = spaceForLetters / (charsToPrint - 1.0f); for (int i = 0; i < captchaCode.length(); i++) { // this is a separate canvas used for the character so that // we can rotate it independently int charWidth = fontMetrics.charWidth(captchaCode.charAt(i)); int charDim = Math.max(maxAdvance, fontHeight); int halfCharDim = (charDim / 2); BufferedImage charImage = new BufferedImage(charDim, charDim, BufferedImage.TYPE_INT_ARGB); Graphics2D charGraphics = charImage.createGraphics(); charGraphics.translate(halfCharDim, halfCharDim); double angle = (Math.random() - 0.5) * rotationRange; charGraphics.transform(AffineTransform.getRotateInstance(angle)); charGraphics.translate(-halfCharDim, -halfCharDim); charGraphics.setColor(textColor); charGraphics.setFont(textFont); int charX = (int) (0.5 * charDim - 0.5 * charWidth); charGraphics.drawString("" + captchaCode.charAt(i), charX, ((charDim - fontMetrics.getAscent()) / 2 + fontMetrics.getAscent())); float x = horizMargin + spacePerChar * (i) - charDim / 2.0f; int y = ((height - charDim) / 2); g.drawImage(charImage, (int) x, y, charDim, charDim, null, null); charGraphics.dispose(); } // Drawing the image border g.setColor(borderColor); g.drawRect(0, 0, width - 1, height - 1); g.dispose(); response.setContentType("image/jpeg"); ImageIO.write(bufferedImage, "jpg", response.getOutputStream()); HttpSession session = request.getSession(); Map<String, String> captchaCodeMap = UtilGenerics.checkMap(session.getAttribute("_CAPTCHA_CODE_")); if (captchaCodeMap == null) { captchaCodeMap = new HashMap<String, String>(); session.setAttribute("_CAPTCHA_CODE_", captchaCodeMap); } captchaCodeMap.put(captchaCodeId, captchaCode); } catch (Exception ioe) { Debug.logError(ioe.getMessage(), module); } return "success"; } }