package com.digitalsanctuary.atg.servlet.pipeline;
import java.io.IOException;
import java.net.UnknownHostException;
import java.util.regex.Pattern;
import javax.servlet.ServletException;
import atg.nucleus.ServiceException;
import atg.service.perfmonitor.PerformanceMonitor;
import atg.servlet.DynamoHttpServletRequest;
import atg.servlet.DynamoHttpServletResponse;
import atg.servlet.pipeline.InsertableServletImpl;
/**
* @author Devon Hillard
*
* Incoming requests which have passed through one or more proxies will have a remoteAddr property of the request set to
* the IP of the last proxy which the request passed through. Proxies should maintain the original request IP, as well
* as any previous proxy IP addresses within an extended request header called X-FORWARDED-FOR. This class looks to see
* if that header exists and is populated, and if so, takes the left-most IP address (which should be the user's source
* IP address) and places it in the request's remoteAddr property, replacing the proxy IP current in there. We currently
* don't care about the proxy's IP address, and the address of the user is more useful for auditing, session security,
* and all other processes currently in place. Since all incoming requests are typically proxied by Akamai servers, we
* need this functionality in order to use ATG Dynamo's built-in session security mechanism which verifies request IP
* addresses against the IP address which spawned the session. This pipeline servlet has to go in front of the
* SessionManager
*
*/
public class ProxyIPFixerServlet extends InsertableServletImpl {
/**
* The request header name that holds the forwarded chain information.
*/
private static final String FORWARDED_FOR_HEADER_NAME = "X-FORWARDED-FOR";
/**
* The string representing the regular expression to match valid IP addresses. This is set from a properties file.
*/
private String mIPAddressPatternString;
/**
* The actual regular expression compiled Pattern object. This is created at startup, but the doStartService()
* method.
*/
private Pattern mIPAddressPattern;
/**
* This method handles the component setup.
*
* @see atg.servlet.pipeline.InsertableServletImpl#doStartService()
* @throws ServiceException
* if do start service fails.
*/
public void doStartService() throws ServiceException {
if (isLoggingInfo()) {
logInfo("ProxyIPFixerServlet.doStartService: Starting component...");
}
super.doStartService();
this.mIPAddressPattern = Pattern.compile(getIPAddressPatternString());
}
/**
* This method handles the component tear-down.
*
* @see atg.servlet.pipeline.InsertableServletImpl#doStopService()
* @throws ServiceException
* if do stop service fails.
*/
public void doStopService() throws ServiceException {
if (isLoggingInfo()) {
logInfo("ProxyIPFixerServlet.doStartService: Stopping component...");
}
super.doStopService();
}
/**
* This method takes in the request and response object, as part of the Dynamo servlet pipeline. All processing on
* those request and response objects takes place here.
*
* @param pRequest
* the Dynamo http request object.
* @param pResponse
* the Dynamo http repsonse object.
*
* @see atg.servlet.pipeline.PipelineableServletImpl#service(atg.servlet.DynamoHttpServletRequest,
* atg.servlet.DynamoHttpServletResponse)
* @throws IOException
* on error
* @throws ServletException
* on error
*/
public void service(final DynamoHttpServletRequest pRequest, final DynamoHttpServletResponse pResponse)
throws IOException, ServletException {
PerformanceMonitor.startOperation(getAbsoluteName(), "service()");
// Is this request proxied?
if (isProxiedRequest(pRequest)) {
if (isLoggingDebug()) {
logDebug("ProxyIPFixerServlet.service: this request appears to have been proxied.");
}
// Get the original IP address for the request
try {
final String originalRequestIP = getOriginatingIP(pRequest);
if (isLoggingDebug()) {
logDebug("ProxyIPFixerServlet.service: replacing the request's remoteAddr " + "with current value:"
+ pRequest.getRemoteAddr() + " with the IP from the forwarded for headers with value:"
+ originalRequestIP + ".");
}
// Replace the latest proxy's IP address with the originating IP
// address for the request in the request's remoteAddr property
pRequest.setRemoteAddr(originalRequestIP);
} catch (final UnknownHostException uhe) {
if (isLoggingError()) {
logError("ProxyIPFixerServlet.service:" + "The value in the forwarded for request header "
+ "was not parseable into an IP address.", uhe);
}
}
}
PerformanceMonitor.endOperation(getAbsoluteName(), "service()");
// Call super to pass the request on to the next servlet
super.service(pRequest, pResponse);
}
/**
* This method looks in the passed in request to see if a forwarding header, identified by the static constant
* FORWARDED_FOR_HEADER_NAME exists, and is populated.
*
* @param pRequest
* the http request to examine
* @return true if the request has been proxied, false, if it has not been (to the best of our ability to determine)
*/
private boolean isProxiedRequest(final DynamoHttpServletRequest pRequest) {
// Get the header from the request
final String forwardedForHeader = pRequest.getHeader(FORWARDED_FOR_HEADER_NAME);
// Check if we got anything and if we did, check to make sure it isn't zero length
return (forwardedForHeader != null && forwardedForHeader.length() > 0);
}
/**
* This method pulls the Originating IP out of the header and returns it as a string.
*
* @param pRequest
* the http request to examine.
* @return the originating IP of the request as a String.
* @throws UnknownHostException
* if the header field cannot be parsed as an IP address.
*/
private String getOriginatingIP(final DynamoHttpServletRequest pRequest) throws UnknownHostException {
// Get the header from the request
final String forwardedForHeader = pRequest.getHeader(FORWARDED_FOR_HEADER_NAME);
// Check if we got anything
if (forwardedForHeader != null) {
// Get the leftmost address if there are more than one
String originatingAddress = null;
final int commaIndex = forwardedForHeader.indexOf(',');
if (commaIndex > -1) {
if (isLoggingDebug()) {
logDebug("ProxyIPFixerServlet.getOriginatingIP:"
+ "there are many IPs in the header, getting the first one.");
}
originatingAddress = forwardedForHeader.substring(0, commaIndex);
} else {
if (isLoggingDebug()) {
logDebug("ProxyIPFixerServlet.getOriginatingIP:" + "there is only one ip in the header, using it.");
}
originatingAddress = forwardedForHeader;
}
// Verify that the value matches what we expect, a quad-IP. This
// regex is looking for: 1 to
// 3 digits followed by a period, repeating 3 times, and
// followed by another set of 1 to 3 digits
if (this.mIPAddressPattern.matcher(originatingAddress).matches()) {
if (isLoggingDebug()) {
logDebug("ProxyIPFixerServlet.getOriginatingIP:" + "The string appears to be a valid IP address:"
+ originatingAddress);
}
return originatingAddress;
}
}
final String msg = "ProxyIPFixerServlet.getOriginatingIP:"
+ "parsing attempt failed. Here is what we were working with:" + " header:" + forwardedForHeader
+ ".";
if (isLoggingDebug()) {
logDebug(msg);
}
// If any of the above checks failed, we were unable to obtain a useable
// IP address from the request's forwarded ip header list.
throw new UnknownHostException(msg);
}
/**
* @return the iPAddressPattern
*/
public String getIPAddressPatternString() {
return this.mIPAddressPatternString;
}
/**
* @param pAddressPattern
* the iPAddressPattern to set
*/
public void setIPAddressPatternString(final String pAddressPattern) {
this.mIPAddressPatternString = pAddressPattern;
}
}
‘Which are the bluebells?’ he asked. The reply came slowly. "No; her husband is quite another man; this man's wife has been dead for years. No, Charlotte Oliver lives in--hark!" Hetty sped from her hiding-place through the hall into the garden. The little green gate was open, and beyond the motor, once more in its black guise. Hetty stood there just a minute, wondering what next she should do. If there was only somebody near that she could confide in and send a message by! If she could only prevent Balmayne from starting on his mysterious errand! "You are wrong," she cried. "It could not have been so." "That is logical, at any rate. But to go further. You borrowed a man's coat to put over your shoulders. And the coat you borrowed was mine with the latchkey in the pocket. That I got from a footman. And when I came to look for my skeleton plot, it was gone. Then I knew where I had to search. Leona Lalage was at the bottom of the Corner House mystery. It was her hand that I had to force. Once that was done the rest was easy." "True? True, sir? You go and look for yourself! And let me tell you one thing—there are no francs-tireurs here! We know quite well what we may do and what not, and only a moment ago I received a message from the Minister of the Interior, saying that non-combatants who shoot at the enemy expose themselves to danger and their fellow-citizens to retaliations." This absolute separation of Form and Matter, under their new names of Thought and Extension, once grasped, various principles of Cartesianism will follow from it by logical necessity. First comes the exclusion of final causes from philosophy, or rather from Nature. There was not, as with Epicurus, any anti-theological feeling concerned in their rejection. With Aristotle, against whom Descartes is always protesting, the final cause was not a mark of designing intelligence imposed on Matter from without; it was only a particular aspect of Form, the realisation of what Matter was always striving after by virtue of its inherent potentiality. When Form was conceived only as pure thought, there could be no question of such a process; the most highly organised bodies being only modes of figured extension. The revival of Atomism had, no doubt, a great deal to do with the preference for a mechanical interpretation of life. Aristotle had himself shown with masterly clearness the difference between his view of Nature and that taken by Democritus; thus indicating beforehand the direction in which an alternative to his own teaching might be sought; and Bacon had, in fact, already referred with approval to the example set by Democritus in dealing with teleological enquiries. "Very well," answered the Deacon a little stiffly, for he was on his guard against cordial strangers. Reuben thought long and anxiously about his brother. He did not speak much of him to his mother or Naomi, for he knew that they would not understand the problem that confronted him. He felt worn by the extra load of work, and his brain fretted, spoiling his good sleep. He[Pg 53] was back in his own room now, but he slept worse than in Harry's; he would lie awake fighting mentally, just as all day he had fought physically—life was a continuous fight. Another trial to him now was that Robert seemed half-hearted. Hitherto he had always worked conscientiously and well, even though he had never been smart or particularly keen; but now he seemed to loaf and slack—he dawdled, slipped clear of what he could, and once he actually asked Reuben for wages! This was unheard-of—not one of Reuben's sons had ever dreamed of such a thing before. HoME一级柜配电线路图 高清
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