FilterImageResize


1   package com.Yasna.forum.filter;
2   
3   import com.Yasna.forum.ForumMessageFilter;
4   import com.Yasna.forum.ForumMessage;
5   
6   import java.io.Serializable  ;
7   import java.util.Properties  ;
8   import java.util.Enumeration  ;
9   import java.util.regex.Pattern  ;
10  import java.util.regex.Matcher  ;
11  
12  /**
13   * Copyright (C) 2001 Yasna.com. All rights reserved.
14   *
15   * ===================================================================
16   * The Apache Software License, Version 1.1
17   *
18   * Redistribution and use in source and binary forms, with or without
19   * modification, are permitted provided that the following conditions
20   * are met:
21   *
22   * 1. Redistributions of source code must retain the above copyright
23   *    notice, this list of conditions and the following disclaimer.
24   *
25   * 2. Redistributions in binary form must reproduce the above copyright
26   *    notice, this list of conditions and the following disclaimer in
27   *    the documentation and/or other materials provided with the
28   *    distribution.
29   *
30   * 3. The end-user documentation included with the redistribution,
31   *    if any, must include the following acknowledgment:
32   *       "This product includes software developed by
33   *        Yasna.com (http://www.yasna.com)."
34   *    Alternately, this acknowledgment may appear in the software itself,
35   *    if and wherever such third-party acknowledgments normally appear.
36   *
37   * 4. The names "Yazd" and "Yasna.com" must not be used to
38   *    endorse or promote products derived from this software without
39   *    prior written permission. For written permission, please
40   *    contact yazd@yasna.com.
41   *
42   * 5. Products derived from this software may not be called "Yazd",
43   *    nor may "Yazd" appear in their name, without prior written
44   *    permission of Yasna.com.
45   *
46   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
47   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
48   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
49   * DISCLAIMED.  IN NO EVENT SHALL YASNA.COM OR
50   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
51   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
52   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
53   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
54   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
55   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
56   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
57   * SUCH DAMAGE.
58   * ====================================================================
59   *
60   * This software consists of voluntary contributions made by many
61   * individuals on behalf of Yasna.com. For more information
62   * on Yasna.com, please see <http://www.yasna.com>.
63   */
64  
65  public class FilterImageResize extends ForumMessageFilter implements Serializable   {
66      /**
67         * Property values of the filter.
68         */
69        private Properties   props;
70  
71        /**
72         * Property descriptions of the filter.
73         */
74        private Properties   propDescriptions;
75  
76        /**
77         * Creates a new filter not associated with a message. This is
78         * generally only useful for defining a template filter that other
79         * fitlers will be cloned from.
80         */
81        public FilterImageResize() {
82            super();
83            props = new Properties  ();
84            props.put("MaxWidth","200");
85            propDescriptions = new Properties  ();
86            propDescriptions.put("MaxWidth","Maximum width of an image tag in the post");
87        }
88     /**
89       * Creates a new filter wrapped around the specified message. This
90       * constructor is normally called when cloning a filter template.
91       *
92       * @param message the ForumMessage to wrap the new filter around.
93       */
94      public FilterImageResize(ForumMessage message, Properties   props,
95                               Properties   propDescriptions)
96      {
97          super(message);
98          this.props = new Properties  (props);
99          this.propDescriptions = new Properties  (propDescriptions);
100     }
101 
102     /**
103      * Clones a new filter that will have the same properties and that
104      * will wrap around the specified message.
105      *
106      * @param message the ForumMessage to wrap the new filter around.
107      */
108     public ForumMessageFilter clone(ForumMessage message){
109         return new FilterImageResize(message,props,propDescriptions);
110     }
111 
112     /**
113      * Returns the name of the filter.
114      */
115     public String   getName() {
116         return "Image Resize Filter";
117     }
118 
119     /**
120      * Returns a description of the filter.
121      */
122     public String   getDescription() {
123         return "This filter will look for the &lt;img tag and replace the width with the maximum size allowed and remove the height";
124     }
125 
126     /**
127      * Returns the author of the filter.
128      */
129     public String   getAuthor() {
130         return "www.yasna.com";
131     }
132 
133     /**
134      * Returns the major version number of the filter.
135      */
136     public int getMajorVersion() {
137         return 1;
138     }
139 
140     /**
141      * Returns a description of the filter.
142      */
143     public int getMinorVersion() {
144         return 0;
145     }
146 
147     /**
148      * Returns the value of a property of the filter.
149      *
150      * @param name the name of the property.
151      */
152     public String   getFilterProperty(String   name) {
153         return props.getProperty(name);
154     }
155 
156     /**
157      * Returns the description of a property of the filter.
158      *
159      * @param name the name of the property.
160      * @return the description of the property.
161      */
162     public String   getFilterPropertyDescription(String   name) {
163         return propDescriptions.getProperty(name);
164     }
165 
166     /**
167      * Returns an Enumeration of all the property names.
168      */
169     public Enumeration   filterPropertyNames() {
170         //No properties, so return null.
171         return props.propertyNames();
172     }
173 
174     /**
175      * Sets a property of the filter. Each filter has a set number of
176      * properties that are determined by the filter author.
177      *
178      * @param name the name of the property to set.
179      * @param value the new value for the property.
180      *
181      * @throws IllegalArgumentException if the property trying to be set doesn't
182      *    exist.
183      */
184     public void setFilterProperty(String   name, String   value)
185             throws IllegalArgumentException  
186     {
187         if (props.getProperty(name) == null || Integer.parseInt(value) < 10) {
188             throw new IllegalArgumentException  ();
189         }
190         props.put(name, value);
191     }
192 
193     /**
194      * <b>Overloaded</b> to return the subject of the message with HTML tags
195      * escaped.
196      */
197     public String   getSubject() {
198         return checkimagewidth(message.getSubject());
199     }
200 
201     /**
202      * <b>Overloaded</b> to return the body of the message with HTML tags
203      * escaped.
204      */
205     public String   getBody() {
206         return checkimagewidth(message.getBody());
207     }
208 
209     /**
210      * This method takes a string which may contain script tags (ie, <script>, </script>,
211      * javascript) and removes the characters.
212      *
213      * @param input The text to be converted.
214      * @return The input string with the tags removed
215      */
216     private String   checkimagewidth( String   input ) {
217         //Check if the string is null or zero length -- if so, return
218         //what was sent in.
219         if( input == null || input.length() == 0 ) {
220             return input;
221         }
222         Pattern   pa = Pattern.compile("\\<\\/?(\\s*)(img)(\\s.*?)(([a-z]+)\\s*=\\s*\"([^\"]+)\")(\\s.*?)?\\>",Pattern.CASE_INSENSITIVE);
223         Pattern   paW = Pattern.compile("(width)\\s*=\\s*(\"|')?([0-9]+)(\"|')?",Pattern.CASE_INSENSITIVE);
224         Pattern   paH = Pattern.compile("(height)\\s*=\\s*(\"|')?([0-9]+)(\"|')?",Pattern.CASE_INSENSITIVE);
225         Matcher   match = pa.matcher(input);
226         StringBuffer   sb=new StringBuffer  ();
227         int maxw = Integer.parseInt(props.getProperty("MaxWidth"));
228                 while (match.find()) {
229                     String   tmp = match.group(0);
230                     Matcher   matchW = paW.matcher(tmp);
231                     if(matchW.find()){       //look for width
232                       if(Integer.parseInt(matchW.group(3).trim())>maxw){
233                          tmp=matchW.replaceAll("width=\""+maxw+"\"");
234                           //we now remove the height tag
235                           Matcher   matchH = paH.matcher(tmp);
236                           if(matchH.find()){
237                               tmp = matchH.replaceAll("");
238                           }
239                           //we now replace the original tag with the new tag
240                           match.appendReplacement(sb,tmp);
241                       }
242 
243                     }
244                  }
245         match.appendTail(sb);
246 
247         return sb.toString();
248     }
249 
250 }
251
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