/*
* %W% %E%
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.net;
import java.util.Map;
import java.util.List;
import java.util.Collections;
import java.util.Comparator;
import java.io.IOException;
/**
* CookieManager provides a concrete implementation of {@link CookieHandler},
* which separates the storage of cookies from the policy surrounding accepting
* and rejecting cookies. A CookieManager is initialized with a {@link CookieStore}
* which manages storage, and a {@link CookiePolicy} object, which makes
* policy decisions on cookie acceptance/rejection.
*
* <p> The HTTP cookie management in java.net package looks like:
* <blockquote>
* <pre>
* use
* CookieHandler <------- HttpURLConnection
* ^
* | impl
* | use
* CookieManager -------> CookiePolicy
* | use
* |--------> HttpCookie
* | ^
* | | use
* | use |
* |--------> CookieStore
* ^
* | impl
* |
* Internal in-memory implementation
* </pre>
* <ul>
* <li>
* CookieHandler is at the core of cookie management. User can call
* CookieHandler.setDefault to set a concrete CookieHanlder implementation
* to be used.
* </li>
* <li>
* CookiePolicy.shouldAccept will be called by CookieManager.put to see whether
* or not one cookie should be accepted and put into cookie store. User can use
* any of three pre-defined CookiePolicy, namely ACCEPT_ALL, ACCEPT_NONE and
* ACCEPT_ORIGINAL_SERVER, or user can define his own CookiePolicy implementation
* and tell CookieManager to use it.
* </li>
* <li>
* CookieStore is the place where any accepted HTTP cookie is stored in.
* If not specified when created, a CookieManager instance will use an internal
* in-memory implementation. Or user can implements one and tell CookieManager
* to use it.
* </li>
* <li>
* Currently, only CookieStore.add(URI, HttpCookie) and CookieStore.get(URI)
* are used by CookieManager. Others are for completeness and might be needed
* by a more sophisticated CookieStore implementation, e.g. a NetscapeCookieSotre.
* </li>
* </ul>
* </blockquote>
*
* <p>There're various ways user can hook up his own HTTP cookie management behavior, e.g.
* <blockquote>
* <ul>
* <li>Use CookieHandler.setDefault to set a brand new {@link CookieHandler} implementation
* <li>Let CookieManager be the default {@link CookieHandler} implementation,
* but implement user's own {@link CookieStore} and {@link CookiePolicy}
* and tell default CookieManager to use them:
* <blockquote><pre>
* // this should be done at the beginning of an HTTP session
* CookieHandler.setDefault(new CookieManager(new MyCookieStore(), new MyCookiePolicy()));
* </pre></blockquote>
* <li>Let CookieManager be the default {@link CookieHandler} implementation, but
* use customized {@link CookiePolicy}:
* <blockquote><pre>
* // this should be done at the beginning of an HTTP session
* CookieHandler.setDefault(new CookieManager());
* // this can be done at any point of an HTTP session
* ((CookieManager)CookieHandler.getDefault()).setCookiePolicy(new MyCookiePolicy());
* </pre></blockquote>
* </ul>
* </blockquote>
*
* <p>The implementation conforms to RFC 2965, section 3.3.
*
* @version %I%, %E%
* @author Edward Wang
* @since 1.6
*/
public class CookieManager extends CookieHandler
{
/* ---------------- Fields -------------- */
private CookiePolicy policyCallback;
private CookieStore cookieJar = null;
/* ---------------- Ctors -------------- */
/**
* Create a new cookie manager.
*
* <p>This constructor will create new cookie manager with default
* cookie store and accept policy. The effect is same as
* <tt>CookieManager(null, null)</tt>.
*/
public CookieManager() {
this(null, null);
}
/**
* Create a new cookie manager with specified cookie store and cookie policy.
*
* @param store a <tt>CookieStore</tt> to be used by cookie manager.
* if <tt>null</tt>, cookie manager will use a default one,
* which is an in-memory CookieStore implmentation.
* @param cookiePolicy a <tt>CookiePolicy</tt> instance
* to be used by cookie manager as policy callback.
* if <tt>null</tt>, ACCEPT_ORIGINAL_SERVER will
* be used.
*/
public CookieManager(CookieStore store,
CookiePolicy cookiePolicy)
{
// use default cookie policy if not specify one
policyCallback = (cookiePolicy == null) ? CookiePolicy.ACCEPT_ORIGINAL_SERVER
: cookiePolicy;
// if not specify CookieStore to use, use default one
if (store == null) {
cookieJar = new sun.net.www.protocol.http.InMemoryCookieStore();
} else {
cookieJar = store;
}
}
/* ---------------- Public operations -------------- */
/**
* To set the cookie policy of this cookie manager.
*
* <p> A instance of <tt>CookieManager</tt> will have
* cookie policy ACCEPT_ORIGINAL_SERVER by default. Users always
* can call this method to set another cookie policy.
*
* @param cookiePolicy the cookie policy. Can be <tt>null</tt>, which
* has no effects on current cookie policy.
*/
public void setCookiePolicy(CookiePolicy cookiePolicy) {
if (cookiePolicy != null) policyCallback = cookiePolicy;
}
/**
* To retrieve current cookie store.
*
* @return the cookie store currently used by cookie manager.
*/
public CookieStore getCookieStore() {
return cookieJar;
}
public Map<String, List<String>>
get(URI uri, Map<String, List<String>> requestHeaders)
throws IOException
{
// pre-condition check
if (uri == null || requestHeaders == null) {
throw new IllegalArgumentException("Argument is null");
}
Map<String, List<String>> cookieMap =
new java.util.HashMap<String, List<String>>();
// if there's no default CookieStore, no way for us to get any cookie
if (cookieJar == null)
return Collections.unmodifiableMap(cookieMap);
List<HttpCookie> cookies = new java.util.ArrayList<HttpCookie>();
for (HttpCookie cookie : cookieJar.get(uri)) {
// apply path-matches rule (RFC 2965 sec. 3.3.4)
if (pathMatches(uri.getPath(), cookie.getPath())) {
cookies.add(cookie);
}
}
// apply sort rule (RFC 2965 sec. 3.3.4)
List<String> cookieHeader = sortByPath(cookies);
cookieMap.put("Cookie", cookieHeader);
return Collections.unmodifiableMap(cookieMap);
}
public void
put(URI uri, Map<String, List<String>> responseHeaders)
throws IOException
{
// pre-condition check
if (uri == null || responseHeaders == null) {
throw new IllegalArgumentException("Argument is null");
}
// if there's no default CookieStore, no need to remember any cookie
if (cookieJar == null)
return;
for (String headerKey : responseHeaders.keySet()) {
// RFC 2965 3.2.2, key must be 'Set-Cookie2'
// we also accept 'Set-Cookie' here for backward compatibility
if (headerKey == null
|| !(headerKey.equalsIgnoreCase("Set-Cookie2")
|| headerKey.equalsIgnoreCase("Set-Cookie")
)
)
{
continue;
}
for (String headerValue : responseHeaders.get(headerKey)) {
try {
List<HttpCookie> cookies = HttpCookie.parse(headerValue);
for (HttpCookie cookie : cookies) {
if (shouldAcceptInternal(uri, cookie)) {
cookieJar.add(uri, cookie);
}
}
} catch (IllegalArgumentException e) {
// invalid set-cookie header string
// no-op
}
}
}
}
/* ---------------- Private operations -------------- */
// to determine whether or not accept this cookie
private boolean shouldAcceptInternal(URI uri, HttpCookie cookie) {
try {
return policyCallback.shouldAccept(uri, cookie);
} catch (Exception ignored) { // pretect against malicious callback
return false;
}
}
/*
* path-matches algorithm, as defined by RFC 2965
*/
private boolean pathMatches(String path, String pathToMatchWith) {
if (path == pathToMatchWith)
return true;
if (path == null || pathToMatchWith == null)
return false;
if (path.startsWith(pathToMatchWith))
return true;
return false;
}
/*
* sort cookies with respect to their path: those with more specific Path attributes
* precede those with less specific, as defined in RFC 2965 sec. 3.3.4
*/
private List<String> sortByPath(List<HttpCookie> cookies) {
Collections.sort(cookies, new CookiePathComparator());
List<String> cookieHeader = new java.util.ArrayList<String>();
for (HttpCookie cookie : cookies) {
// Netscape cookie spec and RFC 2965 have different format of Cookie
// header; RFC 2965 requires a leading $Version="1" string while Netscape
// does not.
// The workaround here is to add a $Version="1" string in advance
if (cookies.indexOf(cookie) == 0 && cookie.getVersion() > 0) {
cookieHeader.add("$Version=\"1\"");
}
cookieHeader.add(cookie.toString());
}
return cookieHeader;
}
static class CookiePathComparator implements Comparator<HttpCookie> {
public int compare(HttpCookie c1, HttpCookie c2) {
if (c1 == c2) return 0;
if (c1 == null) return -1;
if (c2 == null) return 1;
// path rule only applies to the cookies with same name
if (!c1.getName().equals(c2.getName())) return 0;
// those with more specific Path attributes precede those with less specific
if (c1.getPath().startsWith(c2.getPath()))
return -1;
else if (c2.getPath().startsWith(c1.getPath()))
return 1;
else
return 0;
}
}
}
|
