001: /**
002: * Copyright (c) 2003-2007, David A. Czarnecki
003: * All rights reserved.
004: *
005: * Redistribution and use in source and binary forms, with or without
006: * modification, are permitted provided that the following conditions are met:
007: *
008: * Redistributions of source code must retain the above copyright notice, this list of conditions and the
009: * following disclaimer.
010: * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
011: * following disclaimer in the documentation and/or other materials provided with the distribution.
012: * Neither the name of "David A. Czarnecki" and "blojsom" nor the names of its contributors may be used to
013: * endorse or promote products derived from this software without specific prior written permission.
014: * Products derived from this software may not be called "blojsom", nor may "blojsom" appear in their name,
015: * without prior written permission of David A. Czarnecki.
016: *
017: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
018: * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
019: * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
020: * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
021: * EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
022: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
023: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
024: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
025: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
026: * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
027: * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
028: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
029: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
030: */package org.blojsom.plugin.obfuscation;
031:
032: import org.apache.commons.codec.binary.Hex;
033: import org.blojsom.blog.Blog;
034: import org.blojsom.blog.Entry;
035: import org.blojsom.plugin.Plugin;
036: import org.blojsom.plugin.PluginException;
037: import org.blojsom.util.BlojsomConstants;
038:
039: import javax.servlet.http.HttpServletRequest;
040: import javax.servlet.http.HttpServletResponse;
041: import java.io.UnsupportedEncodingException;
042: import java.util.Map;
043:
044: /**
045: * SimpleObfuscationPlugin
046: *
047: * @author David Czarnecki
048: * @since blojsom 3.0
049: * @version $Id: SimpleObfuscationPlugin.java,v 1.2 2007/01/17 02:35:12 czarneckid Exp $
050: */
051: public class SimpleObfuscationPlugin implements Plugin {
052:
053: public static final String BLOJSOM_PLUGIN_SIMPLE_OBFUSCATION = "BLOJSOM_PLUGIN_SIMPLE_OBFUSCATION";
054:
055: /**
056: * Initialize this plugin. This method only called when the plugin is instantiated.
057: *
058: * @throws org.blojsom.plugin.PluginException If there is an error initializing the plugin
059: */
060: public void init() throws PluginException {
061: }
062:
063: /**
064: * Simple obfuscation technique. Take every character and output a hex equivalent.
065: *
066: * @param data Data to be obfuscated
067: * @return Data that has been obfuscated
068: */
069: public String obfuscate(String data) {
070: if (data == null) {
071: return null;
072: }
073:
074: if ("".equals(data)) {
075: return "";
076: }
077:
078: StringBuffer result = new StringBuffer();
079: try {
080: char[] hexString = Hex.encodeHex(data
081: .getBytes(BlojsomConstants.UTF8));
082: for (int i = 0; i < hexString.length; i++) {
083: if (i % 2 == 0) {
084: result.append("%");
085: }
086: result.append(hexString[i]);
087: }
088: } catch (UnsupportedEncodingException e) {
089: return data;
090: }
091:
092: return result.toString();
093: }
094:
095: /**
096: * Process the blog entries
097: *
098: * @param httpServletRequest Request
099: * @param httpServletResponse Response
100: * @param blog {@link Blog} instance
101: * @param context Context
102: * @param entries Blog entries retrieved for the particular request
103: * @return Modified set of blog entries
104: * @throws PluginException If there is an error processing the blog entries
105: */
106: public Entry[] process(HttpServletRequest httpServletRequest,
107: HttpServletResponse httpServletResponse, Blog blog,
108: Map context, Entry[] entries) throws PluginException {
109: context.put(BLOJSOM_PLUGIN_SIMPLE_OBFUSCATION, this );
110:
111: return entries;
112: }
113:
114: /**
115: * Perform any cleanup for the plugin. Called after {@link #process}.
116: *
117: * @throws PluginException If there is an error performing cleanup for this plugin
118: */
119: public void cleanup() throws PluginException {
120: }
121:
122: /**
123: * Called when BlojsomServlet is taken out of service
124: *
125: * @throws PluginException If there is an error in finalizing this plugin
126: */
127: public void destroy() throws PluginException {
128: }
129: }
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