/**
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements. See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership. The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License. You may obtain a copy of the License at
    *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied. See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  package org.apache.wss4j.common.saml;
  
  import java.io.IOException;
  import java.io.InputStream;
  
  import org.opensaml.core.config.Configuration;
  import org.opensaml.core.xml.config.XMLConfigurationException;
  import org.opensaml.core.xml.config.XMLConfigurator;
  import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
  
  /**
   * This class intializes the Opensaml library.
   */
  public final class OpenSAMLBootstrap {
  
      /** List of default configuration files. */
      private static final String[] XML_CONFIGS = {
          "/default-config.xml",
          "/schema-config.xml",
          "/saml1-assertion-config.xml",
          "/saml1-metadata-config.xml",
          "/saml1-protocol-config.xml",
          "/saml2-assertion-config.xml",
          "/saml2-assertion-delegation-restriction-config.xml",
          "/saml2-ecp-config.xml",
          "/saml2-metadata-algorithm-config.xml",
          "/saml2-metadata-attr-config.xml",
          "/saml2-metadata-config.xml",
          "/saml2-metadata-idp-discovery-config.xml",
          "/saml2-metadata-query-config.xml",
          "/saml2-metadata-reqinit-config.xml",
          "/saml2-metadata-ui-config.xml",
          "/saml2-metadata-rpi-config.xml",
          "/saml2-protocol-config.xml",
          "/saml2-protocol-thirdparty-config.xml",
          "/saml2-protocol-aslo-config.xml",
          "/saml2-channel-binding-config.xml",
          "/saml-ec-gss-config.xml",
          "/signature-config.xml",
          "/wss4j-signature-config.xml",  // Override the default Base64 Binary Unmarshaller for X.509 Certificates
          "/encryption-config.xml",
          "/xacml20-context-config.xml",
          "/xacml20-policy-config.xml",
          "/xacml10-saml2-profile-config.xml",
          "/xacml11-saml2-profile-config.xml",
          "/xacml2-saml2-profile-config.xml",
          "/xacml3-saml2-profile-config.xml",
          "/saml2-xacml2-profile.xml",
      };
  
      private OpenSAMLBootstrap() {
          // complete
      }
  
      /**
       * Initializes the OpenSAML library, loading default configurations.
       *
       * @throws XMLConfigurationException thrown if there is a problem initializing the OpenSAML library
       */
      public static synchronized void bootstrap() throws XMLConfigurationException {
          bootstrap(true);
      }
  
      public static synchronized void bootstrap(boolean includeXacml) throws XMLConfigurationException {
          ClassLoader loader = Thread.currentThread().getContextClassLoader();
          try {
              XMLConfigurator configurator = new XMLConfigurator();
  
              Thread.currentThread().setContextClassLoader(XMLObjectProviderRegistrySupport.class.getClassLoader());
  
              for (String config : XML_CONFIGS) {
                  if (includeXacml || !config.contains("xacml")) {
                      //most are found in the Configuration.class classloader
                      InputStream ins = Configuration.class.getResourceAsStream(config);  //NOPMD
                      if (ins == null) {
                          //some are from us
                          ins = OpenSAMLBootstrap.class.getResourceAsStream(config);
                      }
                      if (ins != null) {
                          configurator.load(ins);
                         try {
                             ins.close();
                         } catch (IOException ex) { //NOPMD
                             // Do nothing
                         }
                     }
                 }
             }
         } finally {
             Thread.currentThread().setContextClassLoader(loader);
         }
     }
 
 }