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/*
* SIP Communicator, 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.youtube;
import java.io.*;
import java.net.*;
import java.util.regex.*;
import net.java.sip.communicator.service.replacement.*;
import net.java.sip.communicator.util.*;
import org.json.*;
/**
* Implements the {@link ReplacementService} to provide previews for Youtube
* links.
*
* @author Purvesh Sahoo
*/
public class ReplacementServiceYoutubeImpl
implements ReplacementService
{
/**
* The logger for this class.
*/
private static final Logger logger =
Logger.getLogger(ReplacementServiceYoutubeImpl.class);
/**
* The regex used to match the link in the message.
*/
public static String re1 =
"(http.*?(www\\.)*?youtube\\.com\\/watch\\?v=([a-zA-Z0-9_\\-]+))([?&]\\w+=[\\w-]+)*";
/**
* Configuration label property name. The label is saved in the languages
* file under this property.
*/
public static final String YOUTUBE_CONFIG_LABEL = "YOUTUBE";
/**
* Constructor for <tt>ReplacementServiceYoutubeImpl</tt>. The source needs
* to register itself with {@link ReplacementService} sourceList to be
* displayed in the configuration panel.
*/
public ReplacementServiceYoutubeImpl()
{
sourceList.add(YOUTUBE_CONFIG_LABEL);
logger.trace("Creating a Youtube Source.");
}
/**
* Replaces the youtube video links in the chat message with their
* corresponding thumbnails.
*
* @param chatString the original chat message.
* @return replaced chat message with the thumbnail image; the original
* message in case of no match.
*/
public String getReplacedMessage(final String chatString)
{
final Pattern p =
Pattern.compile(re1, Pattern.CASE_INSENSITIVE | Pattern.DOTALL);
Matcher m = p.matcher(chatString);
int count = 0, startPos = 0;
StringBuffer msgBuff = new StringBuffer();
while (m.find())
{
count++;
msgBuff.append(chatString.substring(startPos, m.start()));
startPos = m.end();
// We only want to replace the inner link text and not the link src.
// All even matches are the text we want to replace.
if (count % 2 == 0)
{
try
{
String url =
"http://youtube.com/oembed/?url=" + m.group(0);
URL sourceURL = new URL(url);
URLConnection conn = sourceURL.openConnection();
BufferedReader in =
new BufferedReader(new InputStreamReader(conn
.getInputStream()));
String inputLine, holder = "";
while ((inputLine = in.readLine()) != null)
holder = inputLine;
in.close();
JSONObject wrapper = new JSONObject(holder);
String thumbUrl = wrapper.getString("thumbnail_url");
if (thumbUrl != null)
{
msgBuff
.append("<IMG HEIGHT=\"90\" WIDTH=\"120\" SRC=\"");
msgBuff.append(thumbUrl);
msgBuff.append("\"></IMG>");
}
else
{
startPos = 0;
msgBuff = new StringBuffer();
}
}
catch (Exception e)
{
startPos = 0;
msgBuff = new StringBuffer();
e.printStackTrace();
}
}
else
{
msgBuff.append(chatString.substring(m.start(), m.end()));
}
}
msgBuff.append(chatString.substring(startPos));
if (!msgBuff.toString().equals(chatString))
return msgBuff.toString();
return chatString;
}
}
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