/* eslint-disable @typescript-eslint/no-unsafe-argument */
/* eslint-disable @typescript-eslint/no-unnecessary-type-assertion */
/* eslint-disable prefer-const */
/* eslint-disable @typescript-eslint/no-shadow */
/* eslint-disable @typescript-eslint/no-unsafe-return */
/* eslint-disable @typescript-eslint/no-unused-vars */
/* eslint-disable @typescript-eslint/no-unsafe-member-access */
/* eslint-disable @typescript-eslint/no-unsafe-assignment */
import assert from 'assert';
import { exec as callbackExec } from 'child_process';
import { access as fsAccess } from 'fs/promises';
import os from 'os';
import { join as pathJoin } from 'path';
import { promisify } from 'util';
import cookieParser from 'cookie-parser';
import express from 'express';
import { engine as expressHandlebars } from 'express-handlebars';
import type { ServeStaticOptions } from 'serve-static';
import type { FindManyOptions, FindOptionsWhere } from 'typeorm';
import { Not, In } from 'typeorm';

import { InstanceSettings } from 'n8n-core';

import type {
	ICredentialTypes,
	ExecutionStatus,
	IExecutionsSummary,
	IN8nUISettings,
} from 'n8n-workflow';
import { jsonParse } from 'n8n-workflow';

// @ts-ignore
import timezones from 'google-timezones-json';
import history from 'connect-history-api-fallback';

import config from '@/config';
import { Queue } from '@/Queue';
import { getSharedWorkflowIds } from '@/WorkflowHelpers';

import { workflowsController } from '@/workflows/workflows.controller';
import {
	EDITOR_UI_DIST_DIR,
	inDevelopment,
	inE2ETests,
	N8N_VERSION,
	TEMPLATES_DIR,
} from '@/constants';
import { credentialsController } from '@/credentials/credentials.controller';
import type { CurlHelper, ExecutionRequest, WorkflowRequest } from '@/requests';
import { registerController } from '@/decorators';
import { AuthController } from '@/controllers/auth.controller';
import { BinaryDataController } from '@/controllers/binaryData.controller';
import { DynamicNodeParametersController } from '@/controllers/dynamicNodeParameters.controller';
import { LdapController } from '@/controllers/ldap.controller';
import { MeController } from '@/controllers/me.controller';
import { MFAController } from '@/controllers/mfa.controller';
import { NodeTypesController } from '@/controllers/nodeTypes.controller';
import { OAuth1CredentialController } from '@/controllers/oauth/oAuth1Credential.controller';
import { OAuth2CredentialController } from '@/controllers/oauth/oAuth2Credential.controller';
import { OwnerController } from '@/controllers/owner.controller';
import { PasswordResetController } from '@/controllers/passwordReset.controller';
import { TagsController } from '@/controllers/tags.controller';
import { TranslationController } from '@/controllers/translation.controller';
import { UsersController } from '@/controllers/users.controller';
import { WorkflowStatisticsController } from '@/controllers/workflowStatistics.controller';
import { ExternalSecretsController } from '@/ExternalSecrets/ExternalSecrets.controller.ee';
import { executionsController } from '@/executions/executions.controller';
import { isApiEnabled, loadPublicApiVersions } from '@/PublicApi';
import { whereClause } from '@/UserManagement/UserManagementHelper';
import { UserManagementMailer } from '@/UserManagement/email';
import type { ICredentialsOverwrite, IDiagnosticInfo, IExecutionsStopData } from '@/Interfaces';
import { ActiveExecutions } from '@/ActiveExecutions';
import { CredentialsOverwrites } from '@/CredentialsOverwrites';
import { CredentialTypes } from '@/CredentialTypes';
import { LoadNodesAndCredentials } from '@/LoadNodesAndCredentials';
import { NodeTypes } from '@/NodeTypes';
import * as ResponseHelper from '@/ResponseHelper';
import { WaitTracker } from '@/WaitTracker';
import { toHttpNodeParameters } from '@/CurlConverterHelper';
import { EventBusController } from '@/eventbus/eventBus.controller';
import { EventBusControllerEE } from '@/eventbus/eventBus.controller.ee';
import { licenseController } from './license/license.controller';
import { setupPushServer, setupPushHandler } from '@/push';
import { setupAuthMiddlewares } from './middlewares';
import { handleLdapInit, isLdapEnabled } from './Ldap/helpers';
import { AbstractServer } from './AbstractServer';
import { PostHogClient } from './posthog';
import { eventBus } from './eventbus';
import { Container } from 'typedi';
import { InternalHooks } from './InternalHooks';
import { License } from './License';
import { getStatusUsingPreviousExecutionStatusMethod } from './executions/executionHelpers';
import { SamlController } from './sso/saml/routes/saml.controller.ee';
import { SamlService } from './sso/saml/saml.service.ee';
import { VariablesController } from './environments/variables/variables.controller.ee';
import { LdapManager } from './Ldap/LdapManager.ee';
import {
	isLdapCurrentAuthenticationMethod,
	isSamlCurrentAuthenticationMethod,
} from './sso/ssoHelpers';
import { SourceControlService } from '@/environments/sourceControl/sourceControl.service.ee';
import { SourceControlController } from '@/environments/sourceControl/sourceControl.controller.ee';

import type { ExecutionEntity } from '@db/entities/ExecutionEntity';
import { ExecutionRepository } from '@db/repositories/execution.repository';
import { SettingsRepository } from '@db/repositories/settings.repository';
import { SharedCredentialsRepository } from '@db/repositories/sharedCredentials.repository';
import { SharedWorkflowRepository } from '@db/repositories/sharedWorkflow.repository';
import { WorkflowRepository } from '@db/repositories/workflow.repository';

import { MfaService } from './Mfa/mfa.service';
import { handleMfaDisable, isMfaFeatureEnabled } from './Mfa/helpers';
import type { FrontendService } from './services/frontend.service';
import { RoleService } from './services/role.service';
import { UserService } from './services/user.service';
import { OrchestrationController } from './controllers/orchestration.controller';
import { WorkflowHistoryController } from './workflows/workflowHistory/workflowHistory.controller.ee';
import { InvitationController } from './controllers/invitation.controller';
import { CollaborationService } from './collaboration/collaboration.service';
import { BadRequestError } from './errors/response-errors/bad-request.error';
import { NotFoundError } from './errors/response-errors/not-found.error';

const exec = promisify(callbackExec);

export class Server extends AbstractServer {
	private endpointPresetCredentials: string;

	private waitTracker: WaitTracker;

	private activeExecutionsInstance: ActiveExecutions;

	private presetCredentialsLoaded: boolean;

	private loadNodesAndCredentials: LoadNodesAndCredentials;

	private nodeTypes: NodeTypes;

	private credentialTypes: ICredentialTypes;

	private frontendService?: FrontendService;

	private postHog: PostHogClient;

	private collaborationService: CollaborationService;

	constructor() {
		super('main');

		this.app.engine('handlebars', expressHandlebars({ defaultLayout: false }));
		this.app.set('view engine', 'handlebars');
		this.app.set('views', TEMPLATES_DIR);

		this.testWebhooksEnabled = true;
		this.webhooksEnabled = !config.getEnv('endpoints.disableProductionWebhooksOnMainProcess');
	}

	async start() {
		this.loadNodesAndCredentials = Container.get(LoadNodesAndCredentials);
		this.credentialTypes = Container.get(CredentialTypes);
		this.nodeTypes = Container.get(NodeTypes);

		if (!config.getEnv('endpoints.disableUi')) {
			// eslint-disable-next-line @typescript-eslint/no-var-requires
			this.frontendService = Container.get(require('@/services/frontend.service').FrontendService);
		}

		this.activeExecutionsInstance = Container.get(ActiveExecutions);
		this.waitTracker = Container.get(WaitTracker);
		this.postHog = Container.get(PostHogClient);

		this.presetCredentialsLoaded = false;
		this.endpointPresetCredentials = config.getEnv('credentials.overwrite.endpoint');

		await super.start();
		this.logger.debug(`Server ID: ${this.uniqueInstanceId}`);

		const cpus = os.cpus();
		const binaryDataConfig = config.getEnv('binaryDataManager');

		const isS3Selected = config.getEnv('binaryDataManager.mode') === 's3';
		const isS3Available = config.getEnv('binaryDataManager.availableModes').includes('s3');
		const isS3Licensed = Container.get(License).isBinaryDataS3Licensed();

		const diagnosticInfo: IDiagnosticInfo = {
			databaseType: config.getEnv('database.type'),
			disableProductionWebhooksOnMainProcess: config.getEnv(
				'endpoints.disableProductionWebhooksOnMainProcess',
			),
			notificationsEnabled: config.getEnv('versionNotifications.enabled'),
			versionCli: N8N_VERSION,
			systemInfo: {
				os: {
					type: os.type(),
					version: os.version(),
				},
				memory: os.totalmem() / 1024,
				cpus: {
					count: cpus.length,
					model: cpus[0].model,
					speed: cpus[0].speed,
				},
			},
			executionVariables: {
				executions_process: config.getEnv('executions.process'),
				executions_mode: config.getEnv('executions.mode'),
				executions_timeout: config.getEnv('executions.timeout'),
				executions_timeout_max: config.getEnv('executions.maxTimeout'),
				executions_data_save_on_error: config.getEnv('executions.saveDataOnError'),
				executions_data_save_on_success: config.getEnv('executions.saveDataOnSuccess'),
				executions_data_save_on_progress: config.getEnv('executions.saveExecutionProgress'),
				executions_data_save_manual_executions: config.getEnv(
					'executions.saveDataManualExecutions',
				),
				executions_data_prune: config.getEnv('executions.pruneData'),
				executions_data_max_age: config.getEnv('executions.pruneDataMaxAge'),
			},
			deploymentType: config.getEnv('deployment.type'),
			binaryDataMode: binaryDataConfig.mode,
			smtp_set_up: config.getEnv('userManagement.emails.mode') === 'smtp',
			ldap_allowed: isLdapCurrentAuthenticationMethod(),
			saml_enabled: isSamlCurrentAuthenticationMethod(),
			binary_data_s3: isS3Available && isS3Selected && isS3Licensed,
			multi_main_setup_enabled: config.getEnv('multiMainSetup.enabled'),
			licensePlanName: Container.get(License).getPlanName(),
			licenseTenantId: config.getEnv('license.tenantId'),
		};

		if (inDevelopment && process.env.N8N_DEV_RELOAD === 'true') {
			void this.loadNodesAndCredentials.setupHotReload();
		}

		void Container.get(WorkflowRepository)
			.findOne({
				select: ['createdAt'],
				order: { createdAt: 'ASC' },
				where: {},
			})
			.then(async (workflow) =>
				Container.get(InternalHooks).onServerStarted(diagnosticInfo, workflow?.createdAt),
			);
		this.collaborationService = Container.get(CollaborationService);
	}

	private async registerControllers(ignoredEndpoints: Readonly<string[]>) {
		const { app, externalHooks, activeWorkflowRunner, nodeTypes, logger } = this;
		setupAuthMiddlewares(app, ignoredEndpoints, this.restEndpoint);

		const internalHooks = Container.get(InternalHooks);
		const mailer = Container.get(UserManagementMailer);
		const userService = Container.get(UserService);
		const postHog = this.postHog;
		const mfaService = Container.get(MfaService);

		const controllers: object[] = [
			new EventBusController(),
			new EventBusControllerEE(),
			Container.get(AuthController),
			Container.get(OAuth1CredentialController),
			Container.get(OAuth2CredentialController),
			new OwnerController(
				config,
				logger,
				internalHooks,
				Container.get(SettingsRepository),
				userService,
				postHog,
			),
			Container.get(MeController),
			Container.get(DynamicNodeParametersController),
			new NodeTypesController(config, nodeTypes),
			Container.get(PasswordResetController),
			Container.get(TagsController),
			new TranslationController(config, this.credentialTypes),
			new UsersController(
				logger,
				externalHooks,
				internalHooks,
				Container.get(SharedCredentialsRepository),
				Container.get(SharedWorkflowRepository),
				activeWorkflowRunner,
				Container.get(RoleService),
				userService,
			),
			Container.get(SamlController),
			Container.get(SourceControlController),
			Container.get(WorkflowStatisticsController),
			Container.get(ExternalSecretsController),
			Container.get(OrchestrationController),
			Container.get(WorkflowHistoryController),
			Container.get(BinaryDataController),
			Container.get(VariablesController),
			new InvitationController(
				config,
				logger,
				internalHooks,
				externalHooks,
				Container.get(UserService),
				postHog,
			),
			Container.get(VariablesController),
		];

		if (isLdapEnabled()) {
			const { service, sync } = LdapManager.getInstance();
			controllers.push(new LdapController(service, sync, internalHooks));
		}

		if (config.getEnv('nodes.communityPackages.enabled')) {
			const { CommunityPackagesController } = await import(
				'@/controllers/communityPackages.controller'
			);
			controllers.push(Container.get(CommunityPackagesController));
		}

		if (inE2ETests) {
			const { E2EController } = await import('./controllers/e2e.controller');
			controllers.push(Container.get(E2EController));
		}

		if (isMfaFeatureEnabled()) {
			controllers.push(new MFAController(mfaService));
		}

		controllers.forEach((controller) => registerController(app, config, controller));
	}

	async configure(): Promise<void> {
		if (config.getEnv('endpoints.metrics.enable')) {
			const { MetricsService } = await import('@/services/metrics.service');
			await Container.get(MetricsService).configureMetrics(this.app);
		}

		const { frontendService } = this;
		if (frontendService) {
			frontendService.addToSettings({
				isNpmAvailable: await exec('npm --version')
					.then(() => true)
					.catch(() => false),
				versionCli: N8N_VERSION,
			});

			await this.externalHooks.run('frontend.settings', [frontendService.getSettings()]);
		}

		await this.postHog.init();

		const publicApiEndpoint = config.getEnv('publicApi.path');
		const excludeEndpoints = config.getEnv('security.excludeEndpoints');

		const ignoredEndpoints: Readonly<string[]> = [
			'assets',
			'healthz',
			'metrics',
			'e2e',
			this.endpointPresetCredentials,
			isApiEnabled() ? '' : publicApiEndpoint,
			...excludeEndpoints.split(':'),
		].filter((u) => !!u);

		assert(
			!ignoredEndpoints.includes(this.restEndpoint),
			`REST endpoint cannot be set to any of these values: ${ignoredEndpoints.join()} `,
		);

		// ----------------------------------------
		// Public API
		// ----------------------------------------

		if (isApiEnabled()) {
			const { apiRouters, apiLatestVersion } = await loadPublicApiVersions(publicApiEndpoint);
			this.app.use(...apiRouters);
			if (frontendService) {
				frontendService.settings.publicApi.latestVersion = apiLatestVersion;
			}
		}
		// Parse cookies for easier access
		this.app.use(cookieParser());

		const { restEndpoint, app } = this;
		setupPushHandler(restEndpoint, app);

		// Make sure that Vue history mode works properly
		this.app.use(
			history({
				rewrites: [
					{
						from: new RegExp(`^/(${[this.restEndpoint, ...ignoredEndpoints].join('|')})/?.*$`),
						to: (context) => {
							return context.parsedUrl.pathname!.toString();
						},
					},
				],
			}),
		);

		if (config.getEnv('executions.mode') === 'queue') {
			await Container.get(Queue).init();
		}

		await handleLdapInit();

		await handleMfaDisable();

		await this.registerControllers(ignoredEndpoints);

		this.app.use(`/${this.restEndpoint}/credentials`, credentialsController);

		// ----------------------------------------
		// Workflow
		// ----------------------------------------
		this.app.use(`/${this.restEndpoint}/workflows`, workflowsController);

		// ----------------------------------------
		// License
		// ----------------------------------------
		this.app.use(`/${this.restEndpoint}/license`, licenseController);

		// ----------------------------------------
		// SAML
		// ----------------------------------------

		// initialize SamlService if it is licensed, even if not enabled, to
		// set up the initial environment
		try {
			await Container.get(SamlService).init();
		} catch (error) {
			this.logger.warn(`SAML initialization failed: ${error.message}`);
		}

		// ----------------------------------------
		// Source Control
		// ----------------------------------------
		try {
			await Container.get(SourceControlService).init();
		} catch (error) {
			this.logger.warn(`Source Control initialization failed: ${error.message}`);
		}

		// ----------------------------------------
		// Active Workflows
		// ----------------------------------------

		// Returns the active workflow ids
		this.app.get(
			`/${this.restEndpoint}/active`,
			ResponseHelper.send(async (req: WorkflowRequest.GetAllActive) => {
				return this.activeWorkflowRunner.allActiveInStorage(req.user);
			}),
		);

		// Returns if the workflow with the given id had any activation errors
		this.app.get(
			`/${this.restEndpoint}/active/error/:id`,
			ResponseHelper.send(async (req: WorkflowRequest.GetActivationError) => {
				const { id: workflowId } = req.params;

				const shared = await Container.get(SharedWorkflowRepository).findOne({
					relations: ['workflow'],
					where: whereClause({
						user: req.user,
						entityType: 'workflow',
						entityId: workflowId,
					}),
				});

				if (!shared) {
					this.logger.verbose('User attempted to access workflow errors without permissions', {
						workflowId,
						userId: req.user.id,
					});

					throw new BadRequestError(`Workflow with ID "${workflowId}" could not be found.`);
				}

				return this.activeWorkflowRunner.getActivationError(workflowId);
			}),
		);

		// ----------------------------------------
		// curl-converter
		// ----------------------------------------
		this.app.post(
			`/${this.restEndpoint}/curl-to-json`,
			ResponseHelper.send(
				async (
					req: CurlHelper.ToJson,
					res: express.Response,
				): Promise<{ [key: string]: string }> => {
					const curlCommand = req.body.curlCommand ?? '';

					try {
						const parameters = toHttpNodeParameters(curlCommand);
						return ResponseHelper.flattenObject(parameters, 'parameters');
					} catch (e) {
						throw new BadRequestError('Invalid cURL command');
					}
				},
			),
		);

		// ----------------------------------------
		// Executions
		// ----------------------------------------

		this.app.use(`/${this.restEndpoint}/executions`, executionsController);

		// ----------------------------------------
		// Executing Workflows
		// ----------------------------------------

		// Returns all the currently working executions
		this.app.get(
			`/${this.restEndpoint}/executions-current`,
			ResponseHelper.send(
				async (req: ExecutionRequest.GetAllCurrent): Promise<IExecutionsSummary[]> => {
					if (config.getEnv('executions.mode') === 'queue') {
						const queue = Container.get(Queue);
						const currentJobs = await queue.getJobs(['active', 'waiting']);

						const currentlyRunningQueueIds = currentJobs.map((job) => job.data.executionId);

						const currentlyRunningManualExecutions =
							this.activeExecutionsInstance.getActiveExecutions();
						const manualExecutionIds = currentlyRunningManualExecutions.map(
							(execution) => execution.id,
						);

						const currentlyRunningExecutionIds =
							currentlyRunningQueueIds.concat(manualExecutionIds);

						if (!currentlyRunningExecutionIds.length) return [];

						const findOptions: FindManyOptions<ExecutionEntity> & {
							where: FindOptionsWhere<ExecutionEntity>;
						} = {
							select: ['id', 'workflowId', 'mode', 'retryOf', 'startedAt', 'stoppedAt', 'status'],
							order: { id: 'DESC' },
							where: {
								id: In(currentlyRunningExecutionIds),
								status: Not(In(['finished', 'stopped', 'failed', 'crashed'] as ExecutionStatus[])),
							},
						};

						const sharedWorkflowIds = await getSharedWorkflowIds(req.user);

						if (!sharedWorkflowIds.length) return [];

						if (req.query.filter) {
							const { workflowId, status, finished } = jsonParse<any>(req.query.filter);
							if (workflowId && sharedWorkflowIds.includes(workflowId)) {
								Object.assign(findOptions.where, { workflowId });
							} else {
								Object.assign(findOptions.where, { workflowId: In(sharedWorkflowIds) });
							}
							if (status) {
								Object.assign(findOptions.where, { status: In(status) });
							}
							if (finished) {
								Object.assign(findOptions.where, { finished });
							}
						} else {
							Object.assign(findOptions.where, { workflowId: In(sharedWorkflowIds) });
						}

						const executions =
							await Container.get(ExecutionRepository).findMultipleExecutions(findOptions);

						if (!executions.length) return [];

						return executions.map((execution) => {
							if (!execution.status) {
								execution.status = getStatusUsingPreviousExecutionStatusMethod(execution);
							}
							return {
								id: execution.id,
								workflowId: execution.workflowId,
								mode: execution.mode,
								retryOf: execution.retryOf !== null ? execution.retryOf : undefined,
								startedAt: new Date(execution.startedAt),
								status: execution.status ?? null,
								stoppedAt: execution.stoppedAt ?? null,
							} as IExecutionsSummary;
						});
					}

					const executingWorkflows = this.activeExecutionsInstance.getActiveExecutions();

					const returnData: IExecutionsSummary[] = [];

					const filter = req.query.filter ? jsonParse<any>(req.query.filter) : {};

					const sharedWorkflowIds = await getSharedWorkflowIds(req.user);

					for (const data of executingWorkflows) {
						if (
							(filter.workflowId !== undefined && filter.workflowId !== data.workflowId) ||
							(data.workflowId !== undefined && !sharedWorkflowIds.includes(data.workflowId))
						) {
							continue;
						}

						returnData.push({
							id: data.id,
							workflowId: data.workflowId === undefined ? '' : data.workflowId,
							mode: data.mode,
							retryOf: data.retryOf,
							startedAt: new Date(data.startedAt),
							status: data.status,
						});
					}

					returnData.sort((a, b) => Number(b.id) - Number(a.id));

					return returnData;
				},
			),
		);

		// Forces the execution to stop
		this.app.post(
			`/${this.restEndpoint}/executions-current/:id/stop`,
			ResponseHelper.send(async (req: ExecutionRequest.Stop): Promise<IExecutionsStopData> => {
				const { id: executionId } = req.params;

				const sharedWorkflowIds = await getSharedWorkflowIds(req.user);

				if (!sharedWorkflowIds.length) {
					throw new NotFoundError('Execution not found');
				}

				const fullExecutionData = await Container.get(ExecutionRepository).findSingleExecution(
					executionId,
					{
						where: {
							workflowId: In(sharedWorkflowIds),
						},
					},
				);

				if (!fullExecutionData) {
					throw new NotFoundError('Execution not found');
				}

				if (config.getEnv('executions.mode') === 'queue') {
					// Manual executions should still be stoppable, so
					// try notifying the `activeExecutions` to stop it.
					const result = await this.activeExecutionsInstance.stopExecution(req.params.id);

					if (result === undefined) {
						// If active execution could not be found check if it is a waiting one
						try {
							return await this.waitTracker.stopExecution(req.params.id);
						} catch (error) {
							// Ignore, if it errors as then it is probably a currently running
							// execution
						}
					} else {
						return {
							mode: result.mode,
							startedAt: new Date(result.startedAt),
							stoppedAt: result.stoppedAt ? new Date(result.stoppedAt) : undefined,
							finished: result.finished,
							status: result.status,
						} as IExecutionsStopData;
					}

					const queue = Container.get(Queue);
					const currentJobs = await queue.getJobs(['active', 'waiting']);

					const job = currentJobs.find((job) => job.data.executionId === req.params.id);

					if (!job) {
						throw new Error(`Could not stop "${req.params.id}" as it is no longer in queue.`);
					} else {
						await queue.stopJob(job);
					}

					const returnData: IExecutionsStopData = {
						mode: fullExecutionData.mode,
						startedAt: new Date(fullExecutionData.startedAt),
						stoppedAt: fullExecutionData.stoppedAt
							? new Date(fullExecutionData.stoppedAt)
							: undefined,
						finished: fullExecutionData.finished,
						status: fullExecutionData.status,
					};

					return returnData;
				}

				// Stop the execution and wait till it is done and we got the data
				const result = await this.activeExecutionsInstance.stopExecution(executionId);

				let returnData: IExecutionsStopData;
				if (result === undefined) {
					// If active execution could not be found check if it is a waiting one
					returnData = await this.waitTracker.stopExecution(executionId);
				} else {
					returnData = {
						mode: result.mode,
						startedAt: new Date(result.startedAt),
						stoppedAt: result.stoppedAt ? new Date(result.stoppedAt) : undefined,
						finished: result.finished,
						status: result.status,
					};
				}

				return returnData;
			}),
		);

		// ----------------------------------------
		// Options
		// ----------------------------------------

		// Returns all the available timezones
		this.app.get(
			`/${this.restEndpoint}/options/timezones`,
			ResponseHelper.send(async (req: express.Request, res: express.Response): Promise<object> => {
				return timezones;
			}),
		);

		// ----------------------------------------
		// Settings
		// ----------------------------------------

		if (frontendService) {
			// Returns the current settings for the UI
			this.app.get(
				`/${this.restEndpoint}/settings`,
				ResponseHelper.send(
					async (req: express.Request, res: express.Response): Promise<IN8nUISettings> => {
						void Container.get(InternalHooks).onFrontendSettingsAPI(
							req.headers.sessionid as string,
						);

						return frontendService.getSettings();
					},
				),
			);
		}

		// ----------------------------------------
		// EventBus Setup
		// ----------------------------------------

		if (!eventBus.isInitialized) {
			await eventBus.initialize();
		}

		if (this.endpointPresetCredentials !== '') {
			// POST endpoint to set preset credentials
			this.app.post(
				`/${this.endpointPresetCredentials}`,
				async (req: express.Request, res: express.Response) => {
					if (!this.presetCredentialsLoaded) {
						const body = req.body as ICredentialsOverwrite;

						if (req.contentType !== 'application/json') {
							ResponseHelper.sendErrorResponse(
								res,
								new Error(
									'Body must be a valid JSON, make sure the content-type is application/json',
								),
							);
							return;
						}

						Container.get(CredentialsOverwrites).setData(body);

						await frontendService?.generateTypes();

						this.presetCredentialsLoaded = true;

						ResponseHelper.sendSuccessResponse(res, { success: true }, true, 200);
					} else {
						ResponseHelper.sendErrorResponse(res, new Error('Preset credentials can be set once'));
					}
				},
			);
		}

		const { staticCacheDir } = Container.get(InstanceSettings);
		if (frontendService) {
			const staticOptions: ServeStaticOptions = {
				cacheControl: false,
				setHeaders: (res: express.Response, path: string) => {
					const isIndex = path === pathJoin(staticCacheDir, 'index.html');
					const cacheControl = isIndex
						? 'no-cache, no-store, must-revalidate'
						: 'max-age=86400, immutable';
					res.header('Cache-Control', cacheControl);
				},
			};

			const serveIcons: express.RequestHandler = async (req, res) => {
				let { scope, packageName } = req.params;
				if (scope) packageName = `@${scope}/${packageName}`;
				const filePath = this.loadNodesAndCredentials.resolveIcon(packageName, req.originalUrl);
				if (filePath) {
					try {
						await fsAccess(filePath);
						return res.sendFile(filePath);
					} catch {}
				}
				res.sendStatus(404);
			};

			this.app.use('/icons/@:scope/:packageName/*/*.(svg|png)', serveIcons);
			this.app.use('/icons/:packageName/*/*.(svg|png)', serveIcons);

			this.app.use(
				'/',
				express.static(staticCacheDir),
				express.static(EDITOR_UI_DIST_DIR, staticOptions),
			);

			const startTime = new Date().toUTCString();
			this.app.use('/index.html', (req, res, next) => {
				res.setHeader('Last-Modified', startTime);
				next();
			});
		} else {
			this.app.use('/', express.static(staticCacheDir));
		}
	}

	protected setupPushServer(): void {
		const { restEndpoint, server, app } = this;
		setupPushServer(restEndpoint, server, app);
	}
}