const http = require('http')
const fsPromises = require('fs').promises
const path = require('path')
const crypto = require('crypto')
const sleep = require('util').promisify(setTimeout)
const argvIndexOfFile = process.argv.indexOf(__filename)
let DATA_INSTANT = parseInt(process.argv[argvIndexOfFile + 1])
if (isNaN(DATA_INSTANT)) {
DATA_INSTANT = 0
}
let SLEEP_TIME = parseInt(process.argv[argvIndexOfFile + 2])
if (isNaN(SLEEP_TIME)) {
SLEEP_TIME = 200
}
let CACHE_MAX_AGE = parseInt(process.argv[argvIndexOfFile + 3])
if (isNaN(CACHE_MAX_AGE)) {
CACHE_MAX_AGE = 0
}
let PORT = parseInt(process.argv[argvIndexOfFile + 4])
if (isNaN(PORT)) {
PORT = 8000
}
function sha384(data) {
const hash = crypto.createHash('sha384')
hash.update(data)
return hash.digest('base64')
}
async function requestListener(req, res) {
let headers = {
'Content-Type': 'text/html',
}
let pathString = req.url.substr(1)
let page = parseInt(pathString)
if (pathString == '') {
page = 1
}
let content = ''
const jsContent = await fsPromises.readFile(path.resolve(__dirname, '../instantpage.js'))
const jsHash = sha384(jsContent)
if (pathString == 'instantpage.js') {
headers['Content-Type'] = 'text/javascript'
content += jsContent
}
else if (!isNaN(page)) {
await sleep(SLEEP_TIME)
if (CACHE_MAX_AGE) {
headers['Cache-Control'] = `max-age=${CACHE_MAX_AGE}`
}
content += await fsPromises.readFile(path.resolve(__dirname, 'header.html'))
if (DATA_INSTANT) {
content += ``
}
else {
content += ``
}
dataInstantAttribute = DATA_INSTANT ? `data-instant` : ``
content += `Page ${page}
`
for (let i = 1; i <= 3; i++) {
if (page != i) {
content += `Page ${i}`
}
}
content += `Opens in a new tab`
content += `Other page anchor`
content += `Same-page anchor`
content += `Manually blacklisted link`
content += `External link`
content += `<a> without href`
content += `file: link`
let footer = await fsPromises.readFile(path.resolve(__dirname, 'footer.html'))
footer = footer.toString().replace('__HASH__', jsHash)
content += footer
}
res.writeHead(200, headers)
res.write(content)
res.end()
}
http.createServer(requestListener).listen(PORT)