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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.directimage;
import java.net.*;
import org.jitsi.service.configuration.*;
import net.java.sip.communicator.service.replacement.*;
import net.java.sip.communicator.service.replacement.directimage.*;
import net.java.sip.communicator.util.*;
/**
* Implements the {@link ReplacementService} to provide previews for direct
* image links.
*
* @author Purvesh Sahoo
* @author Marin Dzhigarov
*/
public class ReplacementServiceDirectImageImpl
implements DirectImageReplacementService
{
/**
* The logger for this class.
*/
private static final Logger logger =
Logger.getLogger(ReplacementServiceDirectImageImpl.class);
/**
* The regex used to match the link in the message.
*/
public static final String URL_PATTERN =
"https?\\:\\/\\/(www\\.)*.*\\.(?:jpg|png|gif)";
/**
* Configuration label shown in the config form.
*/
public static final String DIRECT_IMAGE_CONFIG_LABEL = "Direct Image Link";
/**
* Source name; also used as property label.
*/
public static final String SOURCE_NAME = "DIRECTIMAGE";
/**
* Maximum allowed size of the image in bytes. The default size is 2MB.
*/
private long imgMaxSize = 2097152;
/**
* Configuration property name for maximum allowed size of the image in
* bytes.
*/
private static final String MAX_IMG_SIZE =
"net.java.sip.communicator.impl.replacement.directimage.MAX_IMG_SIZE";
/**
* Constructor for <tt>ReplacementServiceDirectImageImpl</tt>.
*/
public ReplacementServiceDirectImageImpl()
{
setMaxImgSizeFromConf();
logger.trace("Creating a Direct Image Link Source.");
}
/**
* Gets the max allowed size value in bytes from Configuration service and
* sets the value to <tt>imgMaxSize</tt> if succeed. If the configuration
* property isn't available or the value can't be parsed correctly
* the value of <tt>imgMaxSize</tt> isn't changed.
*/
private void setMaxImgSizeFromConf()
{
ConfigurationService configService =
DirectImageActivator.getConfigService();
if(configService != null)
{
String confImgSizeStr =
(String) configService.getProperty(MAX_IMG_SIZE);
try
{
if (confImgSizeStr != null)
{
imgMaxSize = Long.parseLong(confImgSizeStr);
}
else
{
configService.setProperty(MAX_IMG_SIZE, imgMaxSize);
}
}
catch (NumberFormatException e)
{
if (logger.isDebugEnabled())
logger.debug("Failed to parse max image size: "
+ confImgSizeStr + ". Going for default.");
}
}
}
/**
* Returns the thumbnail URL of the image link provided.
*
* @param sourceString the original image link.
* @return the thumbnail image link; the original link in case of no match.
*/
public String getReplacement(String sourceString)
{
return sourceString;
}
/**
* 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 URL_PATTERN;
}
@Override
/**
* Returns the size of the image in bytes.
* @param sourceString the image link.
* @return the file size in bytes of the image link provided; -1 if the size
* isn't available or exceeds the max allowed image size.
*/
public int getImageSize(String sourceString)
{
int length = -1;
try
{
URL url = new URL(sourceString);
String protocol = url.getProtocol();
if (protocol.equals("http") || protocol.equals("https"))
{
HttpURLConnection connection =
(HttpURLConnection)url.openConnection();
length = connection.getContentLength();
connection.disconnect();
}
else if (protocol.equals("ftp"))
{
FTPUtils ftp = new FTPUtils(sourceString);
length = ftp.getSize();
ftp.disconnect();
}
if (length > imgMaxSize)
{
length = -1;
}
}
catch (Exception e)
{
logger.debug("Failed to get the length of the image in bytes", e);
}
return length;
}
/**
* Returns true if the content type of the resource
* pointed by sourceString is an image.
* @param sourceString the original image link.
* @return true if the content type of the resource
* pointed by sourceString is an image.
*/
@Override
public boolean isDirectImage(String sourceString)
{
boolean isDirectImage = false;
try
{
URL url = new URL(sourceString);
String protocol = url.getProtocol();
if (protocol.equals("http") || protocol.equals("https"))
{
HttpURLConnection connection =
(HttpURLConnection)url.openConnection();
isDirectImage = connection.getContentType().contains("image");
connection.disconnect();
}
else if (protocol.equals("ftp"))
{
if (sourceString.endsWith(".png")
|| sourceString.endsWith(".jpg")
|| sourceString.endsWith(".gif"))
{
isDirectImage = true;
}
}
}
catch (Exception e)
{
logger.debug("Failed to retrieve content type information for"
+ sourceString, e);
}
return isDirectImage;
}
}
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