Java tutorial
/* * Copyright 2011 by Graz University of Technology, Austria * MOCCA has been developed by the E-Government Innovation Center EGIZ, a joint * initiative of the Federal Chancellery Austria and Graz University of Technology. * * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by * the European Commission - subsequent versions of the EUPL (the "Licence"); * You may not use this work except in compliance with the Licence. * You may obtain a copy of the Licence at: * http://www.osor.eu/eupl/ * * Unless required by applicable law or agreed to in writing, software * distributed under the Licence is distributed on an "AS IS" basis, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the Licence for the specific language governing permissions and * limitations under the Licence. * * This product combines work with different licenses. See the "NOTICE" text * file for details on the various modules and licenses. * The "NOTICE" text file is part of the distribution. Any derivative works * that you distribute must include a readable copy of the "NOTICE" text file. */ package at.gv.egiz.bku.online.webapp; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.StringWriter; import java.net.URI; import java.net.URISyntaxException; import java.nio.charset.Charset; import java.util.Arrays; import java.util.Locale; import java.util.regex.Pattern; import javax.servlet.ServletConfig; import javax.servlet.ServletContext; import javax.servlet.http.HttpServletResponse; import org.apache.commons.configuration.Configuration; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import at.gv.egiz.bku.binding.HTTPBindingProcessor; import at.gv.egiz.bku.utils.StreamUtil; public class MoccaParameterBean { private static final Logger log = LoggerFactory.getLogger(MoccaParameterBean.class); public static final String PARAM_UI_PAGE_P = "appletPage"; public static final String PARAM_APPLET_WIDTH = "appletWidth"; public static final String PARAM_APPLET_HEIGHT = "appletHeight"; public static final String PARAM_APPLET_BACKGROUND = "appletBackground"; public static final String PARAM_REDIRECT_TARGET = "redirectTarget"; public static final String PARAM_APPLET_BACKGROUND_COLOR = "appletBackgroundColor"; public static final Pattern PATTERM_APPLET_BACKGROUND_COLOR = Pattern.compile("\\#[0-9a-fA-F]{6}"); public static final String PARAM_APPLET_GUI_STYLE = "appletGuiStyle"; public static final String[] VALUES_APPLET_GUI_STYLE = new String[] { "tiny", "simple", "advanced" }; public static final String PARAM_APPLET_EXTENSION = "appletExtension"; public static final String[] VALUES_APPLET_EXTENSION = new String[] { "pin", "activation", "getcertificate", "hardwareinfo", "identity" }; public static final String PARAM_LOCALE = "locale"; public static final Pattern PATTERN_LOCALE = Pattern.compile("[a-zA-Z][a-zA-Z](_[a-zA-Z][a-zA-Z]){0,2}"); private static final String P3P_POLICY = "policyref=\"w3c/p3p.xml\", CP=\"NON DSP COR CUR ADM DEV TAI PSA PSD OUR DEL IND UNI COM NAV INT CNT STA\""; private static final String ENABLE_P3P_HEADER = "EnableP3PHeader"; private Charset charset = Charset.forName("ISO-8859-1"); private HTTPBindingProcessor bindingProcessor; public MoccaParameterBean(HTTPBindingProcessor bindingProcessor) { this.bindingProcessor = bindingProcessor; } public Charset getCharset() { return charset; } public void setCharset(Charset charset) { this.charset = (charset != null) ? Charset.forName("ISO-8859-1") : charset; } public String getUIPage(String defaultValue) { String uiPage = getString(PARAM_UI_PAGE_P); return (uiPage != null) ? uiPage : defaultValue; } public Integer getAppletWidth() { return getInteger(PARAM_APPLET_WIDTH); } public Integer getAppletHeight() { return getInteger(PARAM_APPLET_HEIGHT); } public String getAppletBackground() { String background = getString(PARAM_APPLET_BACKGROUND); if (background != null && !background.isEmpty()) { try { // must be a valid http or https URL URI backgroundURL = new URI(background); if ("http".equals(backgroundURL.getScheme()) || "https".equals(backgroundURL.getScheme())) { return background.toString(); } else { log.warn("Parameter " + PARAM_APPLET_BACKGROUND + "='{}' is not a valid http/https URL.", background); } } catch (URISyntaxException e) { log.warn("Parameter " + PARAM_APPLET_BACKGROUND + "='{}' is not a valid http/https URL.", background, e); } } return null; } public String getAppletBackgroundColor() { String backgroundColor = getString(PARAM_APPLET_BACKGROUND_COLOR); if (backgroundColor != null && !backgroundColor.isEmpty()) { // must be a valid color definition if (PATTERM_APPLET_BACKGROUND_COLOR.matcher(backgroundColor).matches()) { return backgroundColor; } else { log.warn("Parameter " + PARAM_APPLET_BACKGROUND_COLOR + "='{}' is not a valid color definition " + "(must be of form '#hhhhhh').", backgroundColor); } } return null; } public String getRedirectTarget() { return getString(PARAM_REDIRECT_TARGET); } public String getGuiStyle() { String guiStyle = getString(PARAM_APPLET_GUI_STYLE); if (guiStyle != null && !guiStyle.isEmpty()) { // must be one of VALUES_APPLET_GUI_STYLE String style = guiStyle.toLowerCase(); if (Arrays.asList(VALUES_APPLET_GUI_STYLE).contains(style)) { return style; } else { StringBuilder sb = new StringBuilder(); sb.append("Parameter ").append(PARAM_APPLET_GUI_STYLE).append("='").append(guiStyle) .append("' is not valid (must be one of ").append(Arrays.toString(VALUES_APPLET_GUI_STYLE)) .append(")."); log.warn(sb.toString()); } } return null; } public String getExtension() { String extension = getString(PARAM_APPLET_EXTENSION); if (extension != null && !extension.isEmpty()) { // must be one of VALUES_APPLET_EXTENSION String ext = extension.toLowerCase(); if (Arrays.asList(VALUES_APPLET_EXTENSION).contains(ext)) { log.debug("Found parameter " + PARAM_APPLET_EXTENSION + "='{}'.", ext); return ext; } else { StringBuilder sb = new StringBuilder(); sb.append("Parameter ").append(PARAM_APPLET_EXTENSION).append("='").append(extension) .append("' is not valid (must be one of ").append(Arrays.toString(VALUES_APPLET_EXTENSION)) .append(")."); log.warn(sb.toString()); } } return null; } public Locale getLocale() { String locale = getString(PARAM_LOCALE); if (locale != null && !locale.isEmpty()) { // must be a valid locale if (PATTERN_LOCALE.matcher(locale).matches()) { log.debug("Found parameter " + PARAM_LOCALE + "='{}'.", locale); return new Locale(locale); } else { log.warn("Parameter " + PARAM_LOCALE + "='{}' is not a valid locale definition.", locale); } } return bindingProcessor.getLocale(); } public Integer getInteger(String parameterName) { String string = getString(parameterName); if (string == null || string.isEmpty()) { return null; } else { try { return Integer.parseInt(string); } catch (NumberFormatException e) { log.warn("Parameter {} does not contain a valid value.", parameterName, e); return null; } } } public String getString(String parameterName) { if (bindingProcessor != null) { InputStream formData = bindingProcessor.getFormData(parameterName); if (formData != null) { InputStreamReader reader = new InputStreamReader(formData, charset); StringWriter writer = new StringWriter(); try { StreamUtil.copyStream(reader, writer); } catch (IOException e) { log.warn("Failed to get parameter {}.", parameterName, e); } return writer.toString(); } } return null; } public static void setP3PHeader(Configuration config, HttpServletResponse response) { if (config.getBoolean(ENABLE_P3P_HEADER, false)) { // Set P3P Policy Header response.addHeader("P3P", P3P_POLICY); } } public static String getInitParameter(String name, ServletConfig config, ServletContext context) { String initVal = config.getInitParameter(name); String contextVal = context.getInitParameter(config.getServletName() + "." + name); log.debug("Reading init param " + name + ": " + initVal + " - context param " + (config.getServletName() + "." + name) + ": " + contextVal); if (contextVal != null) return contextVal; return initVal; } }