// Copyright (C) 2020 The Android Open Source Project
//
// Licensed 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 com.google.gerrit.sshd;

import com.google.common.flogger.FluentLogger;
import com.google.gerrit.extensions.events.AccountActivationListener;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.sshd.BaseCommand.Failure;
import com.google.inject.Inject;
import java.io.IOException;

/** Closes open SSH connections upon account deactivation. */
public class InactiveAccountDisconnector implements AccountActivationListener {
  private static final FluentLogger logger = FluentLogger.forEnclosingClass();

  private final SshDaemon sshDaemon;

  @Inject
  InactiveAccountDisconnector(SshDaemon sshDaemon) {
    this.sshDaemon = sshDaemon;
  }

  @Override
  public void onAccountDeactivated(int id) {
    try {
      SshUtil.forEachSshSession(
          sshDaemon,
          (sshId, sshSession, abstractSession, ioSession) -> {
            CurrentUser sessionUser = sshSession.getUser();
            if (sessionUser.isIdentifiedUser() && sessionUser.getAccountId().get() == id) {
              logger.atInfo().log(
                  "Disconnecting SSH session %s because user %s(%d) got deactivated",
                  abstractSession, sessionUser.getLoggableName(), id);
              try {
                abstractSession.disconnect(-1, "user deactivated");
              } catch (IOException e) {
                logger.atWarning().withCause(e).log(
                    "Failure while deactivating session %s", abstractSession);
              }
            }
          });
    } catch (Failure e) {
      // Ssh Daemon no longer running. Since we're only disconnecting connections anyways, this is
      // most likely ok, so we log only at info level.
      logger.atInfo().withCause(e).log("Failure while disconnecting deactivated account %d", id);
    }
  }
}