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// 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.restapi.account;

import static com.google.gerrit.server.mail.EmailFactories.KEY_DELETED;

import com.google.common.flogger.FluentLogger;
import com.google.gerrit.exceptions.EmailException;
import com.google.gerrit.extensions.common.Input;
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.AccountResource;
import com.google.gerrit.server.account.AccountSshKey;
import com.google.gerrit.server.account.VersionedAuthorizedKeys;
import com.google.gerrit.server.mail.EmailFactories;
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.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;

/**
 * REST endpoint to delete an SSH key of an account.
 *
 * This REST endpoint handles {@code DELETE
 * /accounts//sshkeys/} requests.
 */
@Singleton
public class DeleteSshKey implements RestModifyView {
  private static final FluentLogger logger = FluentLogger.forEnclosingClass();

  private final Provider self;
  private final PermissionBackend permissionBackend;
  private final VersionedAuthorizedKeys.Accessor authorizedKeys;
  private final SshKeyCache sshKeyCache;
  private final EmailFactories emailFactories;

  @Inject
  DeleteSshKey(
      Provider self,
      PermissionBackend permissionBackend,
      VersionedAuthorizedKeys.Accessor authorizedKeys,
      SshKeyCache sshKeyCache,
      EmailFactories emailFactories) {
    this.self = self;
    this.permissionBackend = permissionBackend;
    this.authorizedKeys = authorizedKeys;
    this.sshKeyCache = sshKeyCache;
    this.emailFactories = emailFactories;
  }

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

    return apply(rsrc.getUser(), rsrc.getSshKey());
  }

  public Response apply(IdentifiedUser user, AccountSshKey sshKey)
      throws RepositoryNotFoundException, IOException, ConfigInvalidException {
    authorizedKeys.deleteKey(user.getAccountId(), sshKey.seq());
    try {
      emailFactories
          .createOutgoingEmail(KEY_DELETED, emailFactories.createDeleteKeyEmail(user, sshKey))
          .send();
    } catch (EmailException e) {
      logger.atSevere().withCause(e).log(
          "Cannot send SSH key deletion message to %s", user.getAccount().preferredEmail());
    }
    user.getUserName().ifPresent(sshKeyCache::evict);

    return Response.none();
  }
}