// Copyright (C) 2013 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.server.account;

import com.google.gerrit.common.errors.EmailException;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.Response;
import com.google.gerrit.extensions.restapi.RestModifyView;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.account.DeleteSshKey.Input;
import com.google.gerrit.server.mail.send.DeleteKeySender;
import com.google.gerrit.server.permissions.GlobalPermission;
import com.google.gerrit.server.permissions.PermissionBackend;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.gerrit.server.ssh.SshKeyCache;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import java.io.IOException;
import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.errors.RepositoryNotFoundException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Singleton
public class DeleteSshKey implements RestModifyView<AccountResource.SshKey, Input> {
  private static final Logger log = LoggerFactory.getLogger(DeleteSshKey.class);

  public static class Input {}

  private final Provider<CurrentUser> self;
  private final PermissionBackend permissionBackend;
  private final VersionedAuthorizedKeys.Accessor authorizedKeys;
  private final SshKeyCache sshKeyCache;
  private final DeleteKeySender.Factory deleteKeySenderFactory;

  @Inject
  DeleteSshKey(
      Provider<CurrentUser> self,
      PermissionBackend permissionBackend,
      VersionedAuthorizedKeys.Accessor authorizedKeys,
      SshKeyCache sshKeyCache,
      DeleteKeySender.Factory deleteKeySenderFactory) {
    this.self = self;
    this.permissionBackend = permissionBackend;
    this.authorizedKeys = authorizedKeys;
    this.sshKeyCache = sshKeyCache;
    this.deleteKeySenderFactory = deleteKeySenderFactory;
  }

  @Override
  public Response<?> apply(AccountResource.SshKey rsrc, Input input)
      throws AuthException, OrmException, RepositoryNotFoundException, IOException,
          ConfigInvalidException, PermissionBackendException {
    if (!self.get().hasSameAccountId(rsrc.getUser())) {
      permissionBackend.user(self).check(GlobalPermission.ADMINISTRATE_SERVER);
    }

    IdentifiedUser user = rsrc.getUser();
    authorizedKeys.deleteKey(user.getAccountId(), rsrc.getSshKey().getKey().get());

    try {
      deleteKeySenderFactory.create(user, rsrc.getSshKey()).send();
    } catch (EmailException e) {
      log.error(
          "Cannot send SSH key deletion message to {}", user.getAccount().getPreferredEmail(), e);
    }

    sshKeyCache.evict(user.getUserName());

    return Response.none();
  }
}