io.fluxcapacitor.javaclient.tracking.handling.authentication.UserProvider Maven / Gradle / Ivy

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Default Java client library for interfacing with Flux Capacitor.
There is a newer version: 0.1072.0
/*
 * Copyright (c) Flux Capacitor IP B.V. or its affiliates. All Rights Reserved.
 *
 * 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 io.fluxcapacitor.javaclient.tracking.handling.authentication;

import io.fluxcapacitor.common.api.Metadata;
import io.fluxcapacitor.javaclient.common.HasMessage;

import java.util.Optional;
import java.util.ServiceLoader;
import java.util.ServiceLoader.Provider;

public interface UserProvider {

    UserProvider defaultUserProvider = Optional.of(ServiceLoader.load(UserProvider.class))
            .flatMap(loader -> loader.stream().map(Provider::get).reduce(UserProvider::andThen)).orElse(null);

    default User getActiveUser() {
        return User.getCurrent();
    }

    User getUserById(Object userId);

    User getSystemUser();

    User fromMessage(HasMessage message);

    boolean containsUser(Metadata metadata);

    Metadata removeFromMetadata(Metadata metadata);

    default Metadata addToMetadata(Metadata metadata, User user) {
        return addToMetadata(metadata, user, false);
    }

    Metadata addToMetadata(Metadata metadata, User user, boolean ifAbsent);

    default UserProvider andThen(UserProvider other) {
        return new DelegatingUserProvider(this) {
            @Override
            public User getUserById(Object userId) {
                return Optional.ofNullable(super.getUserById(userId)).orElseGet(() -> other.getUserById(userId));
            }

            @Override
            public User getSystemUser() {
                return Optional.ofNullable(super.getSystemUser()).orElseGet(other::getSystemUser);
            }

            @Override
            public User fromMessage(HasMessage message) {
                return Optional.ofNullable(super.fromMessage(message)).orElseGet(() -> other.fromMessage(message));
            }

            @Override
            public boolean containsUser(Metadata metadata) {
                return super.containsUser(metadata) || other.containsUser(metadata);
            }

            @Override
            public Metadata removeFromMetadata(Metadata metadata) {
                metadata = super.removeFromMetadata(metadata);
                return other.removeFromMetadata(metadata);
            }

            @Override
            public Metadata addToMetadata(Metadata metadata, User user, boolean ifAbsent) {
                if (ifAbsent) {
                    return other.addToMetadata(super.addToMetadata(metadata, user, true), user, true);
                }
                boolean chained = delegate instanceof DelegatingUserProvider;
                return other.addToMetadata(super.addToMetadata(metadata, user, chained), user, true);
            }
        };
    }

}