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/*
* Jitsi, the OpenSource Java VoIP and Instant Messaging client.
*
* Distributable under LGPL license. See terms of license at gnu.org.
*/
package net.java.sip.communicator.impl.replacement.twitpic;
import java.net.*;
import java.util.regex.*;
import net.java.sip.communicator.service.replacement.*;
import net.java.sip.communicator.util.*;
/**
* Implements the {@link ReplacementService} to provide previews for Twitpic
* links.
*
* @author Purvesh Sahoo
*/
public class ReplacementServiceTwitpicImpl
implements ReplacementService
{
/**
* The logger for this class.
*/
private static final Logger logger
= Logger.getLogger(ReplacementServiceTwitpicImpl.class);
/**
* The regex used to match the link in the message.
*/
public static final String TWITPIC_PATTERN =
"http:\\/\\/(?:www\\.)?twitpic\\.com\\/([^\\/<]*)";
/**
* Configuration label shown in the config form.
*/
public static final String TWITPIC_CONFIG_LABEL = "TwitPic";
/**
* Source name; also used as property label.
*/
public static final String SOURCE_NAME = "TWITPIC";
/**
* Constructor for <tt>ReplacementServiceTwitpicImpl</tt>.
*/
public ReplacementServiceTwitpicImpl()
{
logger.trace("Creating a Twitpic Source.");
}
/**
* Replaces the twitpic image links with their corresponding thumbnails.
*
* @param sourceString the original twitpic link.
* @return thumbnail image link for the source string; the original
* image link in case of no match.
*/
public String getReplacement(String sourceString)
{
final Pattern p =
Pattern.compile("\\.com\\/([^\\/<]*)", Pattern.CASE_INSENSITIVE
| Pattern.DOTALL);
Matcher m = p.matcher(sourceString);
String thumbUrl = sourceString;
while (m.find())
{
thumbUrl = "http://twitpic.com/show/thumb/" + m.group(1);
}
// check for redirect headers
try
{
HttpURLConnection con = (HttpURLConnection)
(new URL(thumbUrl).openConnection());
con.setInstanceFollowRedirects(false);
con.connect();
int responseCode = con.getResponseCode();
if(responseCode == HttpURLConnection.HTTP_MOVED_TEMP
|| responseCode == HttpURLConnection.HTTP_MOVED_PERM)
{
return con.getHeaderField("Location");
}
}
catch(Throwable t)
{}
return thumbUrl;
}
/**
* Returns the source name
*
* @return the source name
*/
public String getSourceName()
{
return SOURCE_NAME;
}
/**
* Returns the pattern of the source
*
* @return the source pattern
*/
public String getPattern()
{
return TWITPIC_PATTERN;
}
}
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