| /* AuthInfo.java -- |
| Copyright (C) 2003, 2006 Free Software Foundation, Inc. |
| |
| This file is a part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or (at |
| your option) any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 |
| USA |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.javax.crypto.sasl; |
| |
| import gnu.java.security.Registry; |
| |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.StringTokenizer; |
| |
| /** |
| * A static class for creating {@link IAuthInfoProvider} providers. It |
| * transparently locates and uses any provider instances, based on the value |
| * assigned to the System property with the key |
| * <code>gnu.crypto.sasl.auth.info.provider.pkgs</code>. If more than one is |
| * specified they SHOULD be separated with a vertical bar character. Please note |
| * that the GNU provider is always added last to the list, disregarding whether |
| * it was mentioned or not in the value of that property, or if it that property |
| * was not defined. |
| */ |
| public class AuthInfo |
| { |
| private static final ArrayList factories = new ArrayList(); |
| static |
| { |
| IAuthInfoProviderFactory ours = new AuthInfoProviderFactory(); |
| // if SASL_AUTH_INFO_PROVIDER_PKGS is defined then parse it |
| String clazz; |
| String pkgs = System.getProperty(Registry.SASL_AUTH_INFO_PROVIDER_PKGS, |
| null); |
| if (pkgs != null) |
| { |
| for (StringTokenizer st = new StringTokenizer(pkgs, "|"); st.hasMoreTokens();) |
| { |
| clazz = st.nextToken().trim(); |
| if (! "gnu.javax.crypto.sasl".equals(clazz)) |
| { |
| clazz += ".AuthInfoProviderFactory"; |
| try |
| { |
| IAuthInfoProviderFactory factory = |
| (IAuthInfoProviderFactory) Class.forName(clazz).newInstance(); |
| factories.add(factory); |
| } |
| catch (ClassCastException ignored) |
| { |
| } |
| catch (ClassNotFoundException ignored) |
| { |
| } |
| catch (InstantiationException ignored) |
| { |
| } |
| catch (IllegalAccessException ignored) |
| { |
| } |
| } |
| } |
| } |
| // always add ours last; unless it's already there |
| if (!factories.contains(ours)) |
| factories.add(ours); |
| } |
| |
| /** Trivial constructor to enforce Singleton pattern. */ |
| private AuthInfo() |
| { |
| super(); |
| } |
| |
| /** |
| * A convenience method to return the authentication information provider for |
| * a designated SASL mechnanism. It goes through all the installed provider |
| * factories, one at a time, and attempts to return a new instance of the |
| * provider for the designated mechanism. It stops at the first factory |
| * returning a non-null provider. |
| * |
| * @param mechanism the name of a SASL mechanism. |
| * @return an implementation that provides {@link IAuthInfoProvider} for that |
| * mechanism; or <code>null</code> if none found. |
| */ |
| public static IAuthInfoProvider getProvider(String mechanism) |
| { |
| for (Iterator it = factories.iterator(); it.hasNext();) |
| { |
| IAuthInfoProviderFactory factory = (IAuthInfoProviderFactory) it.next(); |
| IAuthInfoProvider result = factory.getInstance(mechanism); |
| if (result != null) |
| return result; |
| } |
| return null; |
| } |
| } |