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package org.jvnet.glassfish.comms.clb.core;
import com.sun.grizzly.util.buf.MessageBytes;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.jvnet.glassfish.comms.clb.proxy.http.util.HttpRequest;
import java.util.Map;
import javax.servlet.http.Cookie;
import org.jvnet.glassfish.comms.util.LogUtil;
/**
*
* @author kshitiz
*/
public class StickyBERouteKeyExtractor {
private static final Logger _logger = LogUtil.CLB_LOGGER.getLogger();
/**
* Get the BERoute key from the request. This key uniquely identifies the back-end instance.
*
* @param req the request
*
* @return the BERoute key if present, else return null
*/
public static String getBERouteKey(HttpRequest request) {
String value = null;
MessageBytes uriMB = request.requestURI();
String requestURI = uriMB.toString();
if(_logger.isLoggable(Level.FINER)) {
_logger.log(Level.FINER,
"clb.search_encodedURL_route",
new Object[]{CLBConstants.BEROUTE_KEY_NAME,
requestURI
});
}
//search URL for encoded route
value = extractBERouteFromURI(requestURI);
if (value != null) {
if (_logger.isLoggable(Level.FINER)) {
_logger.log(Level.FINER,
"clb.found_route_encodedURL",
new Object[] {CLBConstants.BEROUTE_KEY_NAME,
value, requestURI
});
}
return value;
}
//search the cookies
if(_logger.isLoggable(Level.FINER))
_logger.log(Level.FINER,
"clb.looking_for_cookie",
new Object[]{CLBConstants.BEROUTE_KEY_NAME});
String cookieString = request.getHeader(CLBConstants.COOKIE_HEADER);
if ((cookieString == null) || (cookieString.length() == 0)) {
if(_logger.isLoggable(Level.FINER))
_logger.log(Level.FINER,
"clb.req_does_not_have_cookie",
new Object[]{CLBConstants.BEROUTE_KEY_NAME});
return null;
}
int index = cookieString.indexOf(CLBConstants.BEROUTE_KEY_NAME);
if (index == -1) {
if(_logger.isLoggable(Level.FINER))
_logger.log(Level.FINER,
"clb.req_does_not_have_cookie",
new Object[]{CLBConstants.BEROUTE_KEY_NAME});
return null;
}
int valueStartIndex = cookieString.indexOf("=", index + 1);
if (valueStartIndex == -1) {
if(_logger.isLoggable(Level.FINER))
_logger.log(Level.FINER,
"clb.req_does_not_have_cookie",
new Object[]{CLBConstants.BEROUTE_KEY_NAME});
return null;
}
String cookieValue = null;
int valueEndIndex = cookieString.indexOf(";", valueStartIndex + 1);
if (valueEndIndex == -1)
valueEndIndex = cookieString.indexOf(",", valueStartIndex + 1);
if (valueEndIndex == -1)
cookieValue = cookieString.substring(valueStartIndex + 1);
else
cookieValue = cookieString.substring(valueStartIndex + 1, valueEndIndex);
if(_logger.isLoggable(Level.FINER))
_logger.log(Level.FINER,
"clb.found_cookie_with_value",
new Object[]{CLBConstants.BEROUTE_KEY_NAME, cookieValue});
return cookieValue;
}
/**
* Extract the encoded BERoute from the requestURI.
* @param requestURI The Http request URI
*
* @return BERoute value if found otherwise null.
*/
private static String extractBERouteFromURI(String requestURI) {
String extractedBERoute = null;
try {
int startIndexForBERoute = requestURI.indexOf(
CLBConstants.BEROUTE_URI_IDENTIFIER);
if (startIndexForBERoute != -1) {
//Found BERoute URL encoded.
if (_logger.isLoggable(Level.FINER)) {
_logger.log(Level.FINER,
"clb.retrieving_URLencoded_route",
new Object[] {CLBConstants.BEROUTE_KEY_NAME,
requestURI
});
}
int startIndexForBERouteValue = startIndexForBERoute
+ CLBConstants.BEROUTE_URI_IDENTIFIER.length();
int startIndexForNextID = requestURI.indexOf(
CLBConstants.COMMA_DELIMITER,
startIndexForBERouteValue);
if (startIndexForNextID != -1) {
//There are more id's encoded; extract BERoute
if (_logger.isLoggable(Level.FINER)) {
_logger.log(Level.FINER,
"clb.multiple_URLencoded_IDs",
new Object[]{CLBConstants.BEROUTE_KEY_NAME,
requestURI
});
}
extractedBERoute = requestURI.substring(
startIndexForBERouteValue,
startIndexForNextID);
} else {
if (_logger.isLoggable(Level.FINER)) {
_logger.log(Level.FINER,
"clb.zero_URLencoded_IDs_after_route",
new Object[]{CLBConstants.BEROUTE_KEY_NAME,
requestURI
});
}
extractedBERoute = requestURI.substring(
startIndexForBERouteValue);
}
return (extractedBERoute.trim());
}
} catch (IndexOutOfBoundsException ex) {
_logger.log(Level.WARNING,
"clb.error_extract_route_encodedURL",
new Object[] {CLBConstants.BEROUTE_KEY_NAME,
requestURI
});
_logger.log(Level.FINE, "clb.caught_an_exception", ex);
}
return extractedBERoute;
}
}