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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.youtube;
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 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 final String YOUTUBE_PATTERN =
"(https?\\:\\/\\/(www\\.)*?youtube\\.com"
+ "\\/watch\\?v=([a-zA-Z0-9_\\-]+))([?&]\\w+=[\\w-]+)*";
/**
* Configuration label shown in the config form.
*/
public static final String YOUTUBE_CONFIG_LABEL = "YouTube";
/**
* Source name; also used as property label.
*/
public static final String SOURCE_NAME = "YOUTUBE";
/**
* Constructor for <tt>ReplacementServiceYoutubeImpl</tt>.
*/
public ReplacementServiceYoutubeImpl()
{
logger.trace("Creating a Youtube Source.");
}
/**
* Returns the thumbnail URL of the video link provided.
*
* @param sourceString the original video link.
* @return the thumbnail image link; the original link in case of no match.
*/
public String getReplacement(String sourceString)
{
final String pattern = "https?:\\/\\/(?:[0-9A-Z-]+\\.)?(?:youtu\\"
+ ".be\\/|youtube\\.com\\S*[^\\w\\-\\s])([\\w\\-]{11})(?=[^\\"
+ "w\\-]|$)(?![?=&+%\\w]*(?:['\"][^<>]*>|<\\/a>))[?=&+%\\w]*";
final Pattern compiledPattern
= Pattern.compile(pattern, Pattern.CASE_INSENSITIVE);
Matcher matcher = compiledPattern.matcher(sourceString);
String thumbUrl = sourceString;
while (matcher.find())
{
String videoID = "";
try
{
videoID = matcher.group(1);
}
catch (Exception e)
{
logger.debug("Replacement failed for " + getSourceName(), e);
return thumbUrl;
}
thumbUrl
= "https://img.youtube.com/vi/" + videoID + "/3.jpg";
}
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 YOUTUBE_PATTERN;
}
}
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