UnboundID Server SDK

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UnboundID Server SDK Documentation

ExampleScriptedIdentityMapper.groovy

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package com.unboundid.directory.sdk.examples.groovy;



import java.util.List;

import com.unboundid.directory.sdk.common.types.InternalConnection;
import com.unboundid.directory.sdk.ds.config.IdentityMapperConfig;
import com.unboundid.directory.sdk.ds.scripting.ScriptedIdentityMapper;
import com.unboundid.directory.sdk.ds.types.DirectoryServerContext;
import com.unboundid.ldap.sdk.DN;
import com.unboundid.ldap.sdk.Filter;
import com.unboundid.ldap.sdk.LDAPException;
import com.unboundid.ldap.sdk.LDAPSearchException;
import com.unboundid.ldap.sdk.ResultCode;
import com.unboundid.ldap.sdk.SearchRequest;
import com.unboundid.ldap.sdk.SearchResultEntry;
import com.unboundid.ldap.sdk.SearchScope;
import com.unboundid.util.args.ArgumentException
import com.unboundid.util.args.ArgumentParser
import com.unboundid.util.args.DNArgument
import com.unboundid.util.args.StringArgument



/**
 * This class provides a simple example of a scripted identity mapper which
 * will expect to find an attribute in a user's entry whose value exactly
 * matches the provided identifier string.  It has two configuration arguments:
 * <UL>
 *   <LI>base-dn -- The base DN below which to search for user entries.  At
 *       least one base DN must be configured.</LI>
 *   <LI>map-attribute -- The name of the attribute in which to search for the
 *       provided identifier string.</LI>
 * </UL>
 */
public final class ExampleScriptedIdentityMapper
       extends ScriptedIdentityMapper
{
  /**
   * The name of the argument that will be used to specify the name of the
   * attribute to search for the provided identifier.
   */
  private static final String ARG_NAME_BASE_DN = "base-dn";



  /**
   * The name of the argument that will be used to specify the name of the
   * attribute to search for the provided identifier.
   */
  private static final String ARG_NAME_MAP_ATTR = "map-attribute";



  // The server context for the server in which this extension is running.
  private DirectoryServerContext serverContext;

  // The list of base DNs to use for the searches.
  private volatile List<DN> baseDNs;

  // The name of the map attribute.
  private volatile String mapAttribute;



  /**
   * Creates a new instance of this identity mapper.  All identity mapper
   * implementations must include a default constructor, but any initialization
   * should generally be done in the {@code initializeIdentityMapper} method.
   */
  public ExampleScriptedIdentityMapper()
  {
    // No implementation required.
  }



    /**
     * Updates the provided argument parser to define any configuration arguments
     * which may be used by this identity mapper.  The argument parser may also
     * be updated to define relationships between arguments (e.g., to specify
     * required, exclusive, or dependent argument sets).
     *
     * @param  parser  The argument parser to be updated with the configuration
     *                 arguments which may be used by this identity mapper.
     *
     * @throws  ArgumentException  If a problem is encountered while updating the
     *                             provided argument parser.
     */
    @Override()
    public void defineConfigArguments(final ArgumentParser parser)
           throws ArgumentException
    {
      // Add an argument that allows you to specify the base DN for users.
      Character shortIdentifier = null;
      String    longIdentifier  = ARG_NAME_BASE_DN;
      boolean   required        = true;
      int       maxOccurrences  = 0; // No maximum.
      String    placeholder     = "{dn}";
      String    description     = "The base DN below which to search for user " +
           "entries.";

      parser.addArgument(new DNArgument(shortIdentifier, longIdentifier, required,
           maxOccurrences, placeholder, description));


      // Add an argument that allows you to specify the map attribute.
      shortIdentifier = null;
      longIdentifier  = ARG_NAME_MAP_ATTR;
      required        = true;
      maxOccurrences  = 1;
      placeholder     = "{attribute}";
      description     = "The name of the attribute in user entries which holds " +
           "the user ID value that will be provided.  It should be indexed for " +
           "equality below all configured base DNs.";

      parser.addArgument(new StringArgument(shortIdentifier, longIdentifier,
           required, maxOccurrences, placeholder, description));
    }



    /**
     * Initializes this identity mapper.
     *
     * @param  serverContext  A handle to the server context for the server in
     *                        which this extension is running.
     * @param  config         The general configuration for this identity mapper.
     * @param  parser         The argument parser which has been initialized from
     *                        the configuration for this identity mapper.
     *
     * @throws  LDAPException  If a problem occurs while initializing this
     *                         identity mapper.
     */
    @Override()
    public void initializeIdentityMapper(
                     final DirectoryServerContext serverContext,
                     final IdentityMapperConfig config,
                     final ArgumentParser parser)
           throws LDAPException
    {
      serverContext.debugInfo("Beginning identity mapper initialization");

      this.serverContext = serverContext;

      // Get the set of base DNs.
      final DNArgument dnArg =
           (DNArgument) parser.getNamedArgument(ARG_NAME_BASE_DN);
      baseDNs = dnArg.getValues();

      // Get the map attribute.
      final StringArgument attrArg =
           (StringArgument) parser.getNamedArgument(ARG_NAME_MAP_ATTR);
      mapAttribute = attrArg.getValue();
    }



    /**
     * Indicates whether the configuration contained in the provided argument
     * parser represents a valid configuration for this extension.
     *
     * @param  config               The general configuration for this identity
     *                              mapper.
     * @param  parser               The argument parser which has been initialized
     *                              with the proposed configuration.
     * @param  unacceptableReasons  A list that can be updated with reasons that
     *                              the proposed configuration is not acceptable.
     *
     * @return  {@code true} if the proposed configuration is acceptable, or
     *          {@code false} if not.
     */
    @Override()
    public boolean isConfigurationAcceptable(final IdentityMapperConfig config,
                        final ArgumentParser parser,
                        final List<String> unacceptableReasons)
    {
      // No special validation is required.
      return true;
    }



    /**
     * Attempts to apply the configuration contained in the provided argument
     * parser.
     *
     * @param  config                The general configuration for this identity
     *                               mapper.
     * @param  parser                The argument parser which has been
     *                               initialized with the new configuration.
     * @param  adminActionsRequired  A list that can be updated with information
     *                               about any administrative actions that may be
     *                               required before one or more of the
     *                               configuration changes will be applied.
     * @param  messages              A list that can be updated with information
     *                               about the result of applying the new
     *                               configuration.
     *
     * @return  A result code that provides information about the result of
     *          attempting to apply the configuration change.
     */
    @Override()
    public ResultCode applyConfiguration(final IdentityMapperConfig config,
                                         final ArgumentParser parser,
                                         final List<String> adminActionsRequired,
                                         final List<String> messages)
    {
      // Get the new set of base DNs.
      final DNArgument dnArg =
           (DNArgument) parser.getNamedArgument(ARG_NAME_BASE_DN);
      final List<DN> newBaseDNs = dnArg.getValues();

      // Get the new map attribute.
      final StringArgument attrArg =
           (StringArgument) parser.getNamedArgument(ARG_NAME_MAP_ATTR);
      final String newMapAttr = attrArg.getValue();

      // Activate the new configuration.
      baseDNs      = newBaseDNs;
      mapAttribute = newMapAttr;

      return ResultCode.SUCCESS;
    }



  /**
   * Performs any cleanup which may be necessary when this identity mapper is
   * to be taken out of service.
   */
  @Override()
  public void finalizeIdentityMapper()
  {
    // No finalization is required.
  }



  /**
   * Performs any processing which may be necessary to map the provided username
   * to a user within the server.
   *
   * @param  username  The username to be mapped to a user within the server.
   *
   * @return  The DN of the user within the server to which the provided
   *          username corresponds.
   *
   * @throws  LDAPException  If the provided username cannot be mapped to
   *                         exactly one user in the server.
   */
  @Override()
  public String mapUsername(final String username)
         throws LDAPException
  {
    final boolean debugEnabled = serverContext.debugEnabled();
    if (debugEnabled)
    {
      serverContext.debugInfo("Attempting to map username " + username);
    }

    // Construct the search request to issue.  We'll swap out the base DN later.
    final Filter f = Filter.createEqualityFilter(mapAttribute, username);
    final SearchRequest r = new SearchRequest("", SearchScope.SUB, f,
         SearchRequest.NO_ATTRIBUTES);


    // Get an internal connection and use it to perform the searches.
    String userDN = null;
    final InternalConnection conn = serverContext.getInternalRootConnection();
    for (final DN baseDN : baseDNs)
    {
      r.setBaseDN(baseDN);

      try
      {
        // Use the searchForEntry method, which will fail if multiple entries
        // are returned.  However, we still need to check to see if a match was
        // already found under a different base DN.
        final SearchResultEntry searchEntry = conn.searchForEntry(r);
        if (searchEntry == null)
        {
          if (debugEnabled)
          {
            serverContext.debugInfo("No match was found below base DN " +
                 baseDN);
          }

          continue;
        }
        else
        {
          if (debugEnabled)
          {
            serverContext.debugInfo("Found matching entry " + userDN);
          }
        }

        if (userDN == null)
        {
          userDN = searchEntry. getDN();
        }
        else
        {
          throw new LDAPException(ResultCode.SIZE_LIMIT_EXCEEDED,
               "Multiple user entries were found matching filter " +
                    f.toString());
        }
      }
      catch (final LDAPSearchException lse)
      {
        serverContext.debugCaught(lse);

        // We should examine the result code to determine how to proceed.
        switch (lse.getResultCode().intValue())
        {
          case ResultCode.NO_SUCH_OBJECT_INT_VALUE:
            // This means that the base entry doesn't exist.  We can ignore
            // this.
            break;

          case ResultCode.SIZE_LIMIT_EXCEEDED_INT_VALUE:
            // This means that multiple entries were found matching the filter.
            throw new LDAPException(ResultCode.SIZE_LIMIT_EXCEEDED,
                 "Multiple user entries were found matching filter" +
                      f.toString(), lse);

          default:
            // We'll just re-throw the exception as-is.
            throw lse;
        }
      }
    }


    // Return the DN of the matching user, or null if none was found.
    return userDN;
  }
}