The attachment got removed so here is my cut and paste
Hello Noel,
Please find the attached regular expression matcher for attachments. I
have named the file "AttachmentFileNameIsRegex.java" with "FileName"
having "N" as caps like in "AttachmentFileNameIs.java"
Location: src\java\org\apache\james\transport\matchers
Please let me know if my submission procedure is too weird. Thanks.
I had promised test cases but have found it impossible for now to create
a testcase. I have run into issues like "how to set up a context" for
the getCondition() call, creating a session(?), etc. Any pointers where
I can find information on this issue?
Also would it be ok to create a package called "test.org.apache....."
for the testcases.
Thanks and sorry for so many queries ;-)
- Virender
>>>>>>>>>> Cut here for "AttachmentFileNameIsRegex.java"
>>>>>>>>>>>>>>>>>>>
package org.apache.james.transport.matchers;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.Locale;
import java.util.StringTokenizer;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Part;
import javax.mail.internet.MimeMessage;
import org.apache.mailet.GenericMatcher;
import org.apache.mailet.Mail;
import org.apache.oro.text.regex.MalformedPatternException;
import org.apache.oro.text.regex.Pattern;
import org.apache.oro.text.regex.Perl5Compiler;
import org.apache.oro.text.regex.Perl5Matcher;
/**
* <P>Checks if at least one attachment has a file name which matches
any
* element of a comma-separated list of regular expressions. </P>
* <P>Multiple file name regular expressions can be specified,
* e.g.: (.*).(exe|bat|vbs), image(.+)2003.(jpg|gif|jpeg|jpe), web(.*),
insecure(.?).js </P>
*
* The method match(Mail) is a verbatim copy from AttachmentFileNameIs
* Couldn't inherit from AttachmentFileNameIs as it kept running into
Nullpointer exceptions
*
* @author Virender Dogra
* @version 1 $Date: 2003/07/15
* @since 2.2.0
*/
public class AttachmentFileNameIsRegex extends GenericMatcher
{
/** contains compiled patterns, setup by init */
private Perl5Matcher matcher;
private Collection patterns;
/** parses and compile the condition for the regular expressions */
public void init() throws MessagingException
{
StringTokenizer st = new StringTokenizer(getCondition(), ", ",
false);
try
{
patterns = compile(Collections.list(st));
} catch (MalformedPatternException mp)
{
throw new MessagingException("Could not initialize regex
patterns", mp);
}
}
/**
* Checks if <I>fileName</I> matches with at least one of the
<CODE>patterns</CODE>.
*/
private boolean matchFound(String fileName)
{
fileName = fileName.toLowerCase(Locale.US).trim();
Iterator patternIter = patterns.iterator();
while (patternIter.hasNext())
{
Pattern regex = (Pattern) patternIter.next();
if (matcher.matches(fileName, regex))
{
return true; // matching file found
}
}
return false;
}
/** Compiles a collection of regular expressions and reinsertes the
compiled pattern back into
* the collection replacing the initila expression
* */
private Collection compile(Collection inPatterns) throws
MalformedPatternException
{
// compile a bunch of regular expressions
Collection compiledPatterns = new ArrayList(10);
matcher = new Perl5Matcher();
Iterator pattIter = inPatterns.iterator();
while (pattIter.hasNext())
{
String regex = (String) pattIter.next();
compiledPatterns.add(new Perl5Compiler().compile(regex));
}
return compiledPatterns;
}
// * The method match(Mail) is a verbatim copy from AttachmentFileNameIs
// * Couldn't inherit from AttachmentFileNameIs as then it kept running
into :
// exception! javax.mail.MessagingException: Malformed message;
// nested exception is:
// java.lang.NullPointerException
// * Please help if you can ;-)
public Collection match(Mail mail) throws MessagingException
{
Exception anException = null;
try
{
MimeMessage message = mail.getMessage();
Object content;
/**
* if there is an attachment and no inline text,
* the content type can be anything
*/
if (message.getContentType() == null)
{
return null;
}
content = message.getContent();
if (content instanceof Multipart)
{
Multipart multipart = (Multipart) content;
for (int i = 0; i < multipart.getCount(); i++)
{
try
{
Part part = multipart.getBodyPart(i);
String fileName = part.getFileName();
if (fileName != null && matchFound(fileName))
{
return mail.getRecipients(); // matching file found
}
} catch (MessagingException e)
{
anException = e;
} // ignore any messaging exception and process next bodypart
}
} else
{
String fileName = message.getFileName();
if (fileName != null && matchFound(fileName))
{
return mail.getRecipients(); // matching file found
}
}
} catch (Exception e)
{
anException = e;
}
// if no matching attachment was found and at least one exception
was catched rethrow it up
if (anException != null)
{
throw new MessagingException("Error message", anException);
}
return null; // no matching attachment found
}
/*
// Code to test a small piece of this class until i find a better way
to test the
// whole class using junit
public void matchFoundForTesting(String fileNames, String condition)
throws MalformedPatternException
{
StringTokenizer st = new StringTokenizer(condition, ", ", false);
this.patterns = compile(Collections.list(st));
StringTokenizer files = new StringTokenizer(fileNames, ", ",
false);
Collection fileNameColl = Collections.list(files);
Iterator fileIter = fileNameColl.iterator();
while (fileIter.hasNext())
{
String filename = (String)fileIter.next();
System.out.println(matchFound(filename) + " for file : " +
filename);
}
}
*/
}
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