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/*
 * 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.calcite.avatica.server;

import org.apache.calcite.avatica.remote.AuthenticationType;

import java.io.File;
import java.util.concurrent.Callable;

/**
 * A generic configuration interface that users can implement to configure the {@link HttpServer}.
 */
public interface AvaticaServerConfiguration {

  /**
   * Returns the type of authentication the {@link HttpServer} should use.
   * @return An enum corresponding to an authentication mechanism
   */
  AuthenticationType getAuthenticationType();

  /**
   * Returns the Kerberos realm to use for the server's login. Only relevant when
   * {@link #getAuthenticationType()} returns {@link AuthenticationType#SPNEGO}.
   *
   * @return The Kerberos realm for the server login, or null if not applicable.
   */
  String getKerberosRealm();

  /**
   * Returns the "primary" component of the Kerberos principal for the Avatica server,
   * e.g. primary/instance@REALM
   */
  String getKerberosServiceName();

  /**
   * Returns the "instance" component of the Kerberos principal for the Avatica server,
   * e.g. primary/instance@REALM
   */
  String getKerberosHostName();

  /**
   * Returns the Kerberos principal that the Avatica server should log in as.
   *
   * @return A Kerberos principal, or null if not applicable.
   */
  String getKerberosPrincipal();

  /**
   * Returns the file to the server's Kerberos keytab.
   */
  default File getKerberosKeytab() {
    return null;
  }

  /**
   * Returns the array of allowed roles for login. Only applicable when
   * {@link #getAuthenticationType()} returns {@link AuthenticationType#BASIC} or
   * {@link AuthenticationType#DIGEST}.
   *
   * @return An array of allowed login roles, or null.
   */
  String[] getAllowedRoles();

  /**
   * Returns the name of the realm to use in coordination with the properties files specified
   * by {@link #getHashLoginServiceProperties()}. Only applicable when
   * {@link #getAuthenticationType()} returns {@link AuthenticationType#BASIC} or
   * {@link AuthenticationType#DIGEST}.
   *
   * @return A realm for the HashLoginService, or null.
   */
  String getHashLoginServiceRealm();

  /**
   * Returns the path to a properties file that contains users and realms. Only applicable when
   * {@link #getAuthenticationType()} returns {@link AuthenticationType#BASIC} or
   * {@link AuthenticationType#DIGEST}.
   *
   * @return A realm for the HashLoginService, or null.
   */
  String getHashLoginServiceProperties();

  /**
   * Returns true if the Avatica server should run user requests at that remote user. Otherwise,
   * all requests are run as the Avatica server user (which is the default).
   *
   * @return True if impersonation is enabled, false otherwise.
   */
  boolean supportsImpersonation();

  /**
   * Invokes the given action as the remoteUserName. This will only be
   * invoked if {@link #supportsImpersonation()} returns true.
   *
   * @param remoteUserName The remote user making a request to the Avatica server.
   * @param remoteAddress The address the remote user is making the request from.
   * @return The result from the Callable.
   *
   * @see RemoteUserDisallowedException to deny a remoteUser access
   */
   T doAsRemoteUser(String remoteUserName, String remoteAddress, Callable action)
      throws Exception;

  /**
   * Extract the user this request should execute as.
   *
   * @return Name of the RemoteUserExtractor
   */
  RemoteUserExtractor getRemoteUserExtractor();
}

// End AvaticaServerConfiguration.java