1 files changed, 150 insertions, 0 deletions
diff --git a/src/main/java/at/gv/util/WebAppUtil.java b/src/main/java/at/gv/util/WebAppUtil.java
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+++ b/src/main/java/at/gv/util/WebAppUtil.java
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+/*
+ * Copyright 2011 Federal Chancellery Austria and
+ * Graz University of Technology
+ * 
+ * Licensed 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 at.gv.util;
+
+import java.io.UnsupportedEncodingException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLEncoder;
+import java.util.Enumeration;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import at.gv.util.ex.InternalErrorException;
+
+/**
+ * Class providing several utility methods for the Servlet API.
+ * 
+ * @author <a href="mailto:Arne.Tauber@egiz.gv.at">Arne Tauber</a>
+ * 
+ */
+public class WebAppUtil {
+
+	private static Logger log = LoggerFactory.getLogger(WebAppUtil.class);
+
+	public static void sendHTTPRedirect(HttpServletResponse response, String redirectURL) {
+		response.setContentLength(0);
+		response.setContentType("text/html");
+		response.setHeader("Location", redirectURL);
+		response.setStatus(HttpServletResponse.SC_FOUND);
+	}
+	
+	public static void disableBrowserCacheForResponse(HttpServletResponse response) {
+		log.debug("Disabling browser cache for HttpServletResponse.");
+		response.setHeader("Cache-Control", "no-cache,no-store,max-age=0");
+		response.setHeader("Pragma", "no-cache");
+		response.setDateHeader("Expires", 1);
+	}
+
+	public static String getBaseURLUnSecure(HttpServletRequest request) {
+		String url = getBaseURL(request);
+		if (url.startsWith("https")) {
+			return "http" + url.substring(5);
+		}
+		return url;
+	}
+
+	public static String getBaseURL(HttpServletRequest request) {
+		StringBuffer buffer = new StringBuffer(getServerURL(request));
+
+		// add context path if available
+		String contextPath = request.getContextPath();
+		if (MiscUtil.isNotEmpty(contextPath)) {
+			buffer.append(contextPath).append("/");
+		}
+
+		return buffer.toString();
+	}
+
+	public static String getServerURL(HttpServletRequest request) {
+		StringBuffer buffer = new StringBuffer();
+
+		// get protocol
+		String protocol = request.getScheme();
+		buffer.append(protocol).append("://");
+
+		// server name
+		buffer.append(request.getServerName());
+
+		// add port if necessary
+		int port = request.getServerPort();
+		if ((protocol.equals("http") && port != 80)
+		    || (protocol.equals("https") && port != 443)) {
+			buffer.append(':');
+			buffer.append(port);
+		}
+
+		return buffer.toString();
+	}
+
+	public static String getRequestURLWithParameters(HttpServletRequest request) {
+		return getRequestURLWithParameters(request, false);
+	}
+
+	public static String getRequestURLWithParameters(HttpServletRequest request,
+	    boolean includeRequestParameters) {
+		StringBuffer buffer = request.getRequestURL();
+		if (includeRequestParameters) {
+			Enumeration paramEnum = request.getParameterNames();
+			if (paramEnum.hasMoreElements()) {
+				buffer.append("?");
+				while (paramEnum.hasMoreElements()) {
+					String param = (String) paramEnum.nextElement();
+					try {
+						buffer.append(URLEncoder.encode(param, "UTF-8"));
+						if (!MiscUtil.isEmpty(request.getParameter(param))) {
+							buffer.append("=").append(
+							    URLEncoder.encode(request.getParameter(param), "UTF-8"));
+						}
+
+					} catch (UnsupportedEncodingException e) {
+						// should never happen as far as the java installation is ok
+						throw new InternalErrorException(e);
+					}
+					if (paramEnum.hasMoreElements()) {
+						buffer.append("&");
+					}
+				}
+			}
+		} else {
+			String queryString = request.getQueryString();
+			if (MiscUtil.isNotEmpty(queryString)) {
+				buffer.append("?").append(queryString);
+			}
+		}
+		String requestURL = buffer.toString();
+		log.debug("Returning request url "
+		    + (includeRequestParameters ? "including request parameters" : "")
+		    + " \"" + requestURL + "\".");
+		return requestURL;
+	}
+
+	public static boolean isFullQualifiedURL(String url) {
+		MiscUtil.assertNotNull(url, "URL");
+		try {
+			new URL(url);
+			return true;
+		} catch (MalformedURLException e) {
+			return false;
+		}
+	}
+
+}