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/*
 * 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.security.authservice.rest;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.apache.shiro.authz.annotation.RequiresAuthentication;
import org.apache.shiro.authz.annotation.RequiresPermissions;
import org.graylog.security.authservice.AuthServiceBackendDTO;
import org.graylog.security.authservice.DBAuthServiceBackendService;
import org.graylog.security.authservice.GlobalAuthServiceConfig;
import org.graylog2.shared.rest.resources.RestResource;
import org.graylog2.shared.security.RestPermissions;

import jakarta.inject.Inject;

import jakarta.ws.rs.Consumes;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.Response;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;

@Path("/system/authentication/services")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
@Api(value = "System/Authentication/Services", description = "Manage authentication services")
@RequiresAuthentication
public class AuthServicesResource extends RestResource {
    private final GlobalAuthServiceConfig authServiceConfig;
    private final DBAuthServiceBackendService backendService;

    @Inject
    public AuthServicesResource(GlobalAuthServiceConfig authServiceConfig,
                                DBAuthServiceBackendService backendService) {
        this.authServiceConfig = authServiceConfig;
        this.backendService = backendService;
    }

    @GET
    @Path("active-backend")
    @ApiOperation("Get active authentication service backend")
    @RequiresPermissions(RestPermissions.AUTH_SERVICE_GLOBAL_CONFIG_READ)
    public Response get() {
        final Optional activeConfig = getActiveBackendConfig();

        // We cannot use an ImmutableMap because the backend value can be null
        final Map response = new HashMap<>();
        response.put("backend", activeConfig.orElse(null));
        response.put("context", Collections.singletonMap("backends_total", backendService.countBackends()));

        return Response.ok(response).build();
    }

    private Optional getActiveBackendConfig() {
        final Optional activeConfig = authServiceConfig.getActiveBackendConfig();

        activeConfig.ifPresent(backend -> checkPermission(RestPermissions.AUTH_SERVICE_BACKEND_READ, backend.id()));

        return activeConfig;
    }
}