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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.group;

import com.google.common.base.Strings;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import com.google.gerrit.common.data.GroupDescription;
import com.google.gerrit.common.errors.NoSuchGroupException;
import com.google.gerrit.extensions.client.AuthType;
import com.google.gerrit.extensions.common.AccountInfo;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.DefaultInput;
import com.google.gerrit.extensions.restapi.IdString;
import com.google.gerrit.extensions.restapi.MethodNotAllowedException;
import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
import com.google.gerrit.extensions.restapi.RestCollectionCreateView;
import com.google.gerrit.extensions.restapi.RestModifyView;
import com.google.gerrit.extensions.restapi.UnprocessableEntityException;
import com.google.gerrit.reviewdb.client.Account;
import com.google.gerrit.reviewdb.client.AccountGroup;
import com.google.gerrit.server.UserInitiated;
import com.google.gerrit.server.account.AccountCache;
import com.google.gerrit.server.account.AccountException;
import com.google.gerrit.server.account.AccountLoader;
import com.google.gerrit.server.account.AccountManager;
import com.google.gerrit.server.account.AccountResolver;
import com.google.gerrit.server.account.AccountState;
import com.google.gerrit.server.account.AuthRequest;
import com.google.gerrit.server.account.GroupControl;
import com.google.gerrit.server.account.externalids.ExternalId;
import com.google.gerrit.server.config.AuthConfig;
import com.google.gerrit.server.group.GroupResource;
import com.google.gerrit.server.group.MemberResource;
import com.google.gerrit.server.group.db.GroupsUpdate;
import com.google.gerrit.server.group.db.InternalGroupUpdate;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.gerrit.server.restapi.group.AddMembers.Input;
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 java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import org.eclipse.jgit.errors.ConfigInvalidException;

@Singleton
public class AddMembers implements RestModifyView {
  public static class Input {
    @DefaultInput String _oneMember;

    List members;

    public static Input fromMembers(List members) {
      Input in = new Input();
      in.members = members;
      return in;
    }

    static Input init(Input in) {
      if (in == null) {
        in = new Input();
      }
      if (in.members == null) {
        in.members = Lists.newArrayListWithCapacity(1);
      }
      if (!Strings.isNullOrEmpty(in._oneMember)) {
        in.members.add(in._oneMember);
      }
      return in;
    }
  }

  private final AccountManager accountManager;
  private final AuthType authType;
  private final AccountResolver accountResolver;
  private final AccountCache accountCache;
  private final AccountLoader.Factory infoFactory;
  private final Provider groupsUpdateProvider;

  @Inject
  AddMembers(
      AccountManager accountManager,
      AuthConfig authConfig,
      AccountResolver accountResolver,
      AccountCache accountCache,
      AccountLoader.Factory infoFactory,
      @UserInitiated Provider groupsUpdateProvider) {
    this.accountManager = accountManager;
    this.authType = authConfig.getAuthType();
    this.accountResolver = accountResolver;
    this.accountCache = accountCache;
    this.infoFactory = infoFactory;
    this.groupsUpdateProvider = groupsUpdateProvider;
  }

  @Override
  public List apply(GroupResource resource, Input input)
      throws AuthException, NotInternalGroupException, UnprocessableEntityException, OrmException,
          IOException, ConfigInvalidException, ResourceNotFoundException,
          PermissionBackendException {
    GroupDescription.Internal internalGroup =
        resource.asInternalGroup().orElseThrow(NotInternalGroupException::new);
    input = Input.init(input);

    GroupControl control = resource.getControl();
    if (!control.canAddMember()) {
      throw new AuthException("Cannot add members to group " + internalGroup.getName());
    }

    Set newMemberIds = new LinkedHashSet<>();
    for (String nameOrEmailOrId : input.members) {
      Account a = findAccount(nameOrEmailOrId);
      if (!a.isActive()) {
        throw new UnprocessableEntityException(
            String.format("Account Inactive: %s", nameOrEmailOrId));
      }
      newMemberIds.add(a.getId());
    }

    AccountGroup.UUID groupUuid = internalGroup.getGroupUUID();
    try {
      addMembers(groupUuid, newMemberIds);
    } catch (NoSuchGroupException e) {
      throw new ResourceNotFoundException(String.format("Group %s not found", groupUuid));
    }
    return toAccountInfoList(newMemberIds);
  }

  Account findAccount(String nameOrEmailOrId)
      throws AuthException, UnprocessableEntityException, OrmException, IOException,
          ConfigInvalidException {
    try {
      return accountResolver.parse(nameOrEmailOrId).getAccount();
    } catch (UnprocessableEntityException e) {
      // might be because the account does not exist or because the account is
      // not visible
      switch (authType) {
        case HTTP_LDAP:
        case CLIENT_SSL_CERT_LDAP:
        case LDAP:
          if (accountResolver.find(nameOrEmailOrId) == null) {
            // account does not exist, try to create it
            Optional a = createAccountByLdap(nameOrEmailOrId);
            if (a.isPresent()) {
              return a.get();
            }
          }
          break;
        case CUSTOM_EXTENSION:
        case DEVELOPMENT_BECOME_ANY_ACCOUNT:
        case HTTP:
        case LDAP_BIND:
        case OAUTH:
        case OPENID:
        case OPENID_SSO:
        default:
      }
      throw e;
    }
  }

  public void addMembers(AccountGroup.UUID groupUuid, Set newMemberIds)
      throws OrmException, IOException, NoSuchGroupException, ConfigInvalidException {
    InternalGroupUpdate groupUpdate =
        InternalGroupUpdate.builder()
            .setMemberModification(memberIds -> Sets.union(memberIds, newMemberIds))
            .build();
    groupsUpdateProvider.get().updateGroup(groupUuid, groupUpdate);
  }

  private Optional createAccountByLdap(String user) throws IOException {
    if (!ExternalId.isValidUsername(user)) {
      return Optional.empty();
    }

    try {
      AuthRequest req = AuthRequest.forUser(user);
      req.setSkipAuthentication(true);
      return accountCache
          .get(accountManager.authenticate(req).getAccountId())
          .map(AccountState::getAccount);
    } catch (AccountException e) {
      return Optional.empty();
    }
  }

  private List toAccountInfoList(Set accountIds)
      throws PermissionBackendException {
    List result = new ArrayList<>();
    AccountLoader loader = infoFactory.create(true);
    for (Account.Id accId : accountIds) {
      result.add(loader.get(accId));
    }
    loader.fill();
    return result;
  }

  @Singleton
  public static class CreateMember
      implements RestCollectionCreateView {
    private final AddMembers put;

    @Inject
    public CreateMember(AddMembers put) {
      this.put = put;
    }

    @Override
    public AccountInfo apply(GroupResource resource, IdString id, Input input)
        throws AuthException, MethodNotAllowedException, ResourceNotFoundException, OrmException,
            IOException, ConfigInvalidException, PermissionBackendException {
      AddMembers.Input in = new AddMembers.Input();
      in._oneMember = id.get();
      try {
        List list = put.apply(resource, in);
        if (list.size() == 1) {
          return list.get(0);
        }
        throw new IllegalStateException();
      } catch (UnprocessableEntityException e) {
        throw new ResourceNotFoundException(id);
      }
    }
  }

  @Singleton
  public static class UpdateMember implements RestModifyView {
    private final GetMember get;

    @Inject
    public UpdateMember(GetMember get) {
      this.get = get;
    }

    @Override
    public AccountInfo apply(MemberResource resource, Input input)
        throws OrmException, PermissionBackendException {
      // Do nothing, the user is already a member.
      return get.apply(resource);
    }
  }
}




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