45 lines
1.3 KiB
JavaScript
45 lines
1.3 KiB
JavaScript
import * as fs from 'node:fs';
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import http from 'node:http';
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const mod = (n, m) => ((n % m) + m) % m;
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const stripURL = s => s.replace(/(^https?:\/\/|\/$)/g, '')
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const sitesArray = fs.readFileSync('./webring.txt', 'utf-8')
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.match(/(?<!#.*)https?:\/\/[^\s]+(?=\s*$)/gmi)
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const sitesLookup = sitesArray.map(stripURL).reduce((acc, current, index) => ({
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...acc, [current]: {
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'/next': sitesArray[mod(index + 1, sitesArray.length)],
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'/prev': sitesArray[mod(index - 1, sitesArray.length)],
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}
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}), {})
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const redirect = (response, url) => {
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response.setHeader('Location', url)
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response.statusCode = 301
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response.end()
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}
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const handle = (direction, from, response) => {
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const destination = sitesLookup[stripURL(from)]?.[direction]
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if (destination)
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return redirect(response, destination)
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response.statusCode = 400
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response.end('the provided site is not in the webring')
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}
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http.createServer((request, response) => {
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const url = new URL(request.url, `http://${request.headers.host}`);
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if (url.pathname === '/prev' || url.pathname === '/next') {
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return handle(url.pathname, url.searchParams.get('from'), response)
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} else if (url.pathname === '/list') {
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return response.setHeader('Content-Type', 'text/plain').end(sitesArray.join('\n'))
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}
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response.statusCode = 404
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response.end('not found')
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}).listen(process.env.PORT || 8080)
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