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ServerService.ts
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ServerService.ts
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import { Server as HttpServer } from 'http';
import express, { Request, Response } from 'express';
import cors from 'cors';
import helmet from 'helmet';
import cookieParser from 'cookie-parser';
import morgan from 'morgan';
import router from '../router/index';
import { Express } from 'express-serve-static-core';
import errorMiddleware from '../middlewares/ErrorMiddleware';
import { allowLocalhostUI, clientUrl, debugEnabled } from '../config';
import responseTime from 'response-time';
import { MetricsService } from './MetricsService';
import * as openApiValidator from 'express-openapi-validator';
import path from 'path';
import { validationMiddleware } from '../middlewares/ValidationMiddleware';
import swaggerUI from 'swagger-ui-express';
import YAML from 'yamljs';
export default class ServerService {
protected PORT: number;
protected app: Express;
protected server: HttpServer;
constructor(port: number) {
this.PORT = port;
this.app = express();
this.bootstrap();
}
private bootstrap() {
this.app.use(express.json());
this.app.use(express.urlencoded({ extended: true }));
this.app.use(cookieParser());
// CORS
let origins;
if (allowLocalhostUI) {
origins = [clientUrl, 'http://localhost:3000'];
} else {
origins = clientUrl;
}
const corsOptions = {
origin: origins,
optionsSuccessStatus: 200,
methods: 'GET,PUT,POST,DELETE,PATCH,OPTIONS',
allowedHeaders:
'Origin,X-Requested-With,Content-Type,Accept,Authorization',
exposedHeaders: 'Content-Range,X-Content-Range',
credentials: true
};
this.app.use(cors(corsOptions));
// Security middleware
this.app.set('trust proxy', 1);
this.app.disable('x-powered-by');
this.app.use(helmet());
this.app.use(helmet.contentSecurityPolicy());
this.app.use(helmet.crossOriginEmbedderPolicy());
this.app.use(helmet.crossOriginOpenerPolicy());
this.app.use(helmet.crossOriginResourcePolicy());
this.app.use(helmet.dnsPrefetchControl());
this.app.use(helmet.expectCt());
this.app.use(helmet.frameguard());
this.app.use(helmet.hidePoweredBy());
this.app.use(helmet.hsts());
this.app.use(helmet.ieNoOpen());
this.app.use(helmet.noSniff());
this.app.use(helmet.originAgentCluster());
this.app.use(helmet.permittedCrossDomainPolicies());
this.app.use(helmet.referrerPolicy());
this.app.use(helmet.xssFilter());
this.app.use(
responseTime((request: Request, response: Response, time: number) => {
if (request?.route?.path) {
MetricsService.restResponseTimeHistogram.observe(
{
method: request.method,
route: request.route.path,
status_code: response.statusCode
},
time / 1000
); //in seconds
}
})
);
if (debugEnabled) {
this.app.use(morgan('dev'));
}
const apiSpec = path.join(path.resolve(), 'swagger/swagger.yaml');
this.app.use(
openApiValidator.middleware({
apiSpec
})
);
this.app.use(validationMiddleware);
this.app.use('/api', router);
this.app.use(errorMiddleware);
const swaggerDocument = YAML.load('./swagger/swagger.yaml');
this.app.use('/docs', swaggerUI.serve, swaggerUI.setup(swaggerDocument));
}
get getApp(): Express {
return this.app;
}
async start(): Promise<HttpServer> {
return await new Promise((resolve, reject) => {
try {
const server = this.server;
this.server = this.app.listen(this.PORT, () => {
console.log(`Server started on PORT = ${this.PORT}`);
resolve(server);
});
} catch (e) {
reject(e);
}
});
}
async stop(): Promise<unknown> {
return new Promise((resolve, reject) => {
try {
this.server.once('close', resolve);
this.server.close();
} catch (e) {
reject(e);
}
});
}
}