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There is a newer version: 6.1.4
/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog.grn;
import org.graylog.events.processor.EventDefinition;
import org.graylog2.plugin.database.users.User;

import javax.inject.Singleton;
import java.util.Collection;
import java.util.Locale;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Strings.isNullOrEmpty;

/**
 * The global {@link GRN} registry.
 */
@Singleton
public class GRNRegistry {
    // TODO: Find a better name for the "everyone" grantee GRN type
    public static final GRN GLOBAL_USER_GRN = GRNTypes.BUILTIN_TEAM.newGRNBuilder().entity("everyone").build();

    private final ConcurrentMap REGISTRY = new ConcurrentHashMap<>();

    // Don't allow direct instantiation
    private GRNRegistry() {
    }

    /**
     * Returns an empty registry.
     *
     * @return the registry
     */
    public static GRNRegistry createEmpty() {
        return new GRNRegistry();
    }

    /**
     * Returns a registry that has been initialized with the builtin Graylog GRN types.
     *
     * @return the registry
     */
    public static GRNRegistry createWithBuiltinTypes() {
        return createWithTypes(GRNTypes.builtinTypes());
    }

    /**
     * Returns a registry that has been initialized with the given GRN types.
     *
     * @param types the GRN types to initialize the registry with
     * @return the registry
     */
    public static GRNRegistry createWithTypes(Collection types) {
        final GRNRegistry grnRegistry = new GRNRegistry();

        types.forEach(grnRegistry::registerType);

        return grnRegistry;
    }

    /**
     * Parses the given GRN string and returns a {@link GRN}.
     *
     * @param grnString the GRN string to parse
     * @return the GRN
     * @throws IllegalArgumentException when given GRN string is invalid
     */
    public GRN parse(String grnString) {
        return GRN.parse(grnString, this);
    }

    /**
     * Returns the {@link GRN} for the given type and entity.
     *
     * @param type   the GRN type string
     * @param entity the entity string
     * @return the GRN
     * @throws IllegalArgumentException when given type doesn't exist or any arguments are null or empty
     */
    public GRN newGRN(String type, String entity) {
        checkArgument(!isNullOrEmpty(type), "type cannot be null or empty");
        checkArgument(!isNullOrEmpty(entity), "entity cannot be null or empty");

        return newGRNBuilder(type).entity(entity).build();
    }

    /**
     * Returns the {@link GRN} for the given type and entity.
     *
     * @param type   the GRN type string
     * @param entity the entity string
     * @return the GRN
     * @throws IllegalArgumentException when given type doesn't exist or any arguments are null or empty
     */
    public GRN newGRN(GRNType type, String entity) {
        checkArgument(!isNullOrEmpty(entity), "entity cannot be null or empty");

        return newGRNBuilder(type).entity(entity).build();
    }

    public GRN ofEventDefinition(EventDefinition eventDefinition) {
        return newGRN(GRNTypes.EVENT_DEFINITION, eventDefinition.id());
    }

    public GRN ofUser(User user) {
        return newGRN(GRNTypes.USER, user.getId());
    }

    public boolean isUser(GRN grn) {
        return grn.type().equals(GRNTypes.USER.type());
    }

    /**
     * Returns a new {@link GRN.Builder} for the given type string.
     *
     * @param type the GRN type string
     * @return the GRN builder
     * @throws IllegalArgumentException when given type doesn't exist
     */
    public GRN.Builder newGRNBuilder(String type) {
        final GRNType grnType = Optional.ofNullable(REGISTRY.get(toKey(type)))
                .orElseThrow(() -> new IllegalArgumentException("type <" + type + "> does not exist"));

        return grnType.newGRNBuilder();
    }

    /**
     * Returns a new {@link GRN.Builder} for the given type string.
     *
     * @param type the GRN type string
     * @return the GRN builder
     * @throws IllegalArgumentException when given type doesn't exist
     */
    public GRN.Builder newGRNBuilder(GRNType type) {
        final GRNType grnType = Optional.ofNullable(REGISTRY.get(type.type()))
                .orElseThrow(() -> new IllegalArgumentException("type <" + type + "> does not exist"));

        return grnType.newGRNBuilder();
    }

    /**
     * Registers the given GRN type.
     *
     * @param type the typt to register
     * @throws IllegalStateException when given type is already registered
     */
    public void registerType(GRNType type) {
        checkArgument(type != null, "type cannot be null");

        if (REGISTRY.putIfAbsent(toKey(type.type()), type) != null) {
            throw new IllegalStateException("Type <" + type.type() + "> already exists");
        }
    }

    private String toKey(String type) {
        checkArgument(type != null, "type cannot be null");
        checkArgument(!type.trim().isEmpty(), "type name cannot be empty");

        return type.trim().toLowerCase(Locale.US);
    }
}