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    1   /*
    2    * Copyright [2007] [University Corporation for Advanced Internet Development, Inc.]
    3    *
    4    * Licensed under the Apache License, Version 2.0 (the "License");
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    *
    8    * http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16
    17  package edu.internet2.middleware.shibboleth.idp.profile.saml1;
    18
    19  import java.util.List;
    20
    21  import org.opensaml.common.binding.BasicEndpointSelector;
    22  import org.opensaml.saml2.metadata.Endpoint;
    23  import org.opensaml.xml.util.DatatypeHelper;
    24  import org.slf4j.Logger;
    25  import org.slf4j.LoggerFactory;
    26
    27  /**
    28   * An endpoint selector that may optionally take a SP-provided assertion consumer service URL, validate it against
    29   * metadata, and return an endpoint based on it. If no URL is provided the {@link BasicEndpointSelector} selection is
    30   * used.
    31   */
    32  public class ShibbolethSSOEndpointSelector extends BasicEndpointSelector {
    33
    34      /** Class logger. */
    35      private final Logger log = LoggerFactory.getLogger(ShibbolethSSOEndpointSelector.class);
    36
    37      /** Assertion consumer service URL provided by SP. */
    38      private String spAssertionConsumerService;
    39
    40      /**
    41       * Gets the assertion consumer service URL provided by SP.
    42       *
    43       * @return assertion consumer service URL provided by SP
    44       */
    45      public String getSpAssertionConsumerService() {
    46          return spAssertionConsumerService;
    47      }
    48
    49      /**
    50       * Sets the assertion consumer service URL provided by SP.
    51       *
    52       * @param acs assertion consumer service URL provided by SP
    53       */
    54      public void setSpAssertionConsumerService(String acs) {
    55          spAssertionConsumerService = DatatypeHelper.safeTrimOrNullString(acs);
    56      }
    57
    58      /** {@inheritDoc} */
    59      public Endpoint selectEndpoint() {
    60          if (getEntityRoleMetadata() == null) {
    61              log.debug("Unable to select endpoint, no entity role metadata available.");
    62              return null;
    63          }
    64
    65          if (spAssertionConsumerService != null) {
    66              return selectEndpointByACS();
    67          } else {
    68              return super.selectEndpoint();
    69          }
    70      }
    71
    72      /**
    73       * Selects the endpoint, from metadata, corresponding to the SP-provdided ACS URL.
    74       *
    75       * @return endpoint corresponding to the SP-provdided ACS URL
    76       */
    77      protected Endpoint selectEndpointByACS() {
    78          log.debug("Selecting endpoint from metadata corresponding to provided ACS URL: '{}'",
    79                  getSpAssertionConsumerService());
    80
    81          List<Endpoint> endpoints = getEntityRoleMetadata().getEndpoints();
    82          log.debug("Relying party role contains '{}' endpoints", endpoints.size());
    83
    84          if (endpoints != null && endpoints.size() > 0) {
    85              for (Endpoint endpoint : endpoints) {
    86                  if (endpoint == null || !getSupportedIssuerBindings().contains(endpoint.getBinding())) {
    87                      continue;
    88                  }
    89
    90                  if (endpoint.getLocation().equalsIgnoreCase(spAssertionConsumerService)) {
    91                      return endpoint;
    92                  }
    93
    94                  if (!DatatypeHelper.isEmpty(endpoint.getResponseLocation())
    95                          && endpoint.getResponseLocation().equalsIgnoreCase(spAssertionConsumerService)) {
    96                      return endpoint;
    97                  }
    98              }
    99          }
    100
    101         log.debug("No endpoint meets selection criteria for SAML entity '{}'", getEntityMetadata().getEntityID());
    102         return null;
    103     }
    104 }