118 lines
3.1 KiB
TypeScript
118 lines
3.1 KiB
TypeScript
import express, { Request, Response, NextFunction } from 'express'
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import morgan from 'morgan'
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const app = express()
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const port:number = 3000
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interface Product {
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name: string
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price: number
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brand: string
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category?: string
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}
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interface ProductCreationResponse {
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productID: string
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result: string
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}
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class AppError extends Error{
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statusCode: number;
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constructor(statusCode: number, message: string) {
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super(message);
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Object.setPrototypeOf(this, new.target.prototype);
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this.name = Error.name;
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this.statusCode = statusCode;
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Error.captureStackTrace(this);
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}
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}
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const requestLogger = (request: Request, response: Response, next: NextFunction) => {
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console.log(`${request.method} url:: ${request.url}`);
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next()
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}
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app.use(express.static('images'))
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app.use(express.static('htmls'))
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app.use(requestLogger)
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app.use(morgan('tiny'))
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app.use('/products', express.json({ limit: 100 }))
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// Error handling Middleware functions
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const errorLogger = (error: Error, request: Request, response: Response, next: NextFunction) => {
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console.log( `error ${error.message}`)
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next(error) // calling next middleware
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}
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const errorResponder = (error: AppError, request: Request, response: Response, next: NextFunction) => {
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response.header("Content-Type", 'application/json')
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const status = error.statusCode || 400
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response.status(status).send(error.message)
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}
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const invalidPathHandler = (request: Request, response: Response, next: NextFunction) => {
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response.status(400)
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response.send('invalid path')
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}
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app.get('product', (request: Request, response: Response)=>{
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response.sendFile("productsample.html")
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})
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// handle get request for path /
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app.get('/', (request: Request, response: Response) => {
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response.send('response for GET request');
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})
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const requireJsonContent = (request: Request, response: Response, next: NextFunction) => {
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if (request.headers['content-type'] !== 'application/json') {
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response.status(400).send('Server requires application/json')
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} else {
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next()
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}
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}
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const addProducts = (request: Request, response: Response, next: NextFunction) => {
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let products: Product[] = []
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const name: string = request.body.name
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const brand: string = request.body.brand
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const category: string = request.body.category
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console.log(name + " " + brand)
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products.push({name: request.body.name, brand: request.body.brand, price: request.body.price})
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const productCreationResponse: ProductCreationResponse = {productID: "12345", result: "success"}
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response.json(productCreationResponse)
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response.status(200).json(products);
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}
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app.post('/products', addProducts)
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app.get('/productswitherror', (request: Request, response: Response) => {
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let error: AppError = new AppError(400, `processing error in request at ${request.url}`)
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throw error
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})
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app.use(errorLogger)
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app.use(errorResponder)
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app.use(invalidPathHandler)
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app.listen(port, () => {
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console.log(`Server listening at port ${port}.`)
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}) |