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URL shortener: Difference between revisions
Add JavaScript
(add libheader kemal for crystal) |
(Add JavaScript) |
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Line 352:
No such shortened url: http://localhost:8000/3DOPwhRv
</pre>
=={{header|JavaScript}}==
<lang JavaScript>#!/usr/bin/env node
var mapping = new Map();
// assure num. above 36 ^ 9
var base = 101559956668416;
// 36 ^ (10 -> length of ID)
var ceil = 3656158440062976;
// these are calculated as:
// l = desired length
// 198 > l > 1
// -> above 198 ends up as Infinity
// -> below 1 ends up as 0, as one would except (pun intended)
// base = 36 ^ (l - 1)
// ceil = 36 ^ l
require('http').createServer((req, res) => {
if(req.url === '/') {
// only accept POST requests as JSON to /
if(req.method !== 'POST' || req.headers['content-type'] !== 'application/json') {
// 400 Bad Request
res.writeHead(400);
return res.end();
}
var random = (Math.random() * (ceil - base) + base).toString(36);
req.on('data', chunk => {
// trusting input json to be valid, e.g., '{"long":"https://www.example.com/"}'
var body = JSON.parse(chunk.toString());
mapping.set(random.substring(0, 10), body.long); // substr gets the integer part
});
// 201 Created
res.writeHead(201);
return res.end('http://localhost:8080/' + random.substring(0, 10));
}
var url = mapping.get(req.url.substring(1));
if(url) {
// 302 Found
res.writeHead(302, { 'Location': url });
return res.end();
}
// 404 Not Found
res.writeHead(404);
res.end();
}).listen(8080);</lang>
{{out}}
<pre>$ curl -X POST http://localhost:8080/ -H "Content-Type: application/json" --data "{\"long\":\"https://www.example.com\"}"
http://localhost:8080/bcg4x4lla8
$ </pre>
http://localhost:8080/bcg4x4lla8 then redirects to www.example.com
=={{header|Julia}}==
Assumes
<lang julia>using Base64, HTTP, JSON2, Sockets, SQLite, SHA
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