Skip to content
Permalink
b7d64f7d5e
Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?

TEACHING-MATERIALS/exercises/02_http/02_headers/express.js

Go to file
 
 
Cannot retrieve contributors at this time
140 lines (123 sloc) 3.62 KB
Raw Blame
'use strict'
const fs = require('fs')
const js2xmlparser = require('js2xmlparser')
const express = require('express')
const bodyParser = require('body-parser')
const app = express()
app.use(express.static('public'))
app.use(bodyParser.urlencoded({ extended: true }))
const port = 8080
const minLength = 3
const status = {
ok: 200,
created: 201,
notFound: 404,
notAcceptable: 406,
conflict: 409
}
const names = []
app.get('/', (req, res) => {
res.send('Hello World')
})
app.get('/hello', (req, res) => {
res.sendFile(`${__dirname}/hello.html`)
})
app.get('/hello/:name', (req, res) => {
console.log(req.params)
const myname = req.params.first
res.send(`hello ${myname}`)
})
app.get('/hello/:first/:last', (req, res) => {
console.log(req.params)
const name = {
firstname: req.params.first,
lastname: req.params.last
}
console.log(name)
res.send(`hello ${name.firstname} ${name.lastname}`)
})
app.get('/animal/:name', (req, res) => {
console.log(req.params.name)
fs.exists(`public/${req.params.name}.png`, exists => {
if (exists) {
console.log(`found ${req.params.name}.png`)
res.setHeader('content-type', 'image/png')
console.log('sending file')
const filename = `${__dirname}/public/${req.params.name}.png`
console.log(filename)
res.sendFile(filename)
} else {
console.log('not found!')
res.status(status.notFound).send('Animal Not found')
}
})
})
app.get('/form', (req, res) => {
res.sendFile(`${__dirname}/form.html`)
})
app.post('/form', (req, res) => {
console.log('processing the file')
if(req.body.firstname.length >= minLength && req.body.lastname.length >= minLength) {
names.push( { firstname: req.body.firstname, lastname: req.body.lastname } )
res.status(status.created).send(`your name is ${req.body.firstname} ${req.body.lastname}`)
}
})
app.get('/names', (req, res) => {
let list = names
let search = 'x'
if(req.query.search && req.query.search.length >= minLength) {
console.log(`found query parameter: ${req.query.search}`)
search = req.query.search.toLowerCase()
} else if(req.headers.search && req.headers.search.length >= minLength) {
console.log(`found header: ${req.headers.search}`)
search = req.headers.search.toLowerCase()
}
console.log(req.headers.accepts)
if(search.length >= minLength) {
console.log(`you are searching for '${search}'`)
console.log(search)
list = names.filter( val => `${val.firstname} ${val.lastname}`.toLowerCase().includes(search))
}
if(list.length === 0) {
res.status(status.notFound).send('No Names found')
return
}
console.log()
res.format({
'text/csv': () => {
res.setHeader('content-type', 'text/csv')
for(const name of list) {
res.write(`${name.firstname}, ${name.lastname}`)
}
res.end()
},
'text/html': () => {
console.log('text/html requested')
res.setHeader('content-type', 'text/html')
console.log(names)
res.write('<html><head><link rel="stylesheet" href="main.css"/></head><body><table>')
for(const name of list) {
console.log(name)
res.write(`<tr><td>${name.firstname}</td><td>${name.lastname}</td>`)
}
res.write('</table></body></html>')
res.end()
},
'application/json': () => {
console.log('application/json requested')
res.setHeader('content-type', 'application/json')
res.status(status.ok).send(list)
},
'application/xml': () => {
console.log('application/xml requested')
res.setHeader('content-type', 'application/xml')
res.status(status.ok).send(js2xmlparser.parse('people', list))
},
default: () => {
res.status(status.notAcceptable).send('unsupported MIME type')
}
})
})
app.listen(port, () => {
console.log(`app listening on port ${port}`)
})