overpass turbo URL shortener

index.js

var http = require('http');
var url = require('url');
var redis = require('redis');
var base62 = require('base62');

var db = redis.createClient("/var/run/redis/redis-server.sock");

http.createServer(function (req, res) {
  if (req.method == "OPTIONS") {
    res.writeHead(200, {
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Methods': 'GET, OPTIONS',
        'Access-Control-Allow-Headers': 'x-requested-with',
    });
    res.end();
    return;
  }
  var req_url = url.parse(req.url);
  if (req_url.pathname == "/create") {
    // only allow a whitelist of minify-able pages:
    if (!req_url.query.match(/^(\?|index.html\?|map.html\?)/)) {
      res.writeHead(403, {
        'Content-Type': 'text/plain',
        'Access-Control-Allow-Origin': '*',
      });
      res.end();
    } else
    db.incr("short_urls_count", function(err, short_urls_count) {
      var short_id = base62.encode(short_urls_count);
      var short_url = "https://overpass-turbo.eu/s/"+short_id;
      db.hset("short_urls", short_id, req_url.query);
      res.writeHead(200, {
        'Content-Type': 'text/plain',
        'Access-Control-Allow-Origin': '*',
      });
      res.end(short_url);
    });
  } else {
    db.hget("short_urls", req_url.path.substr(1), function(err, short_url) {
      res.writeHead(301, {
        'Location': 'https://overpass-turbo.eu/'+short_url,
        'Access-Control-Allow-Origin': '*',
      });
      res.end();
    });
  }
}).listen(8191, '127.0.0.1');

package-lock.json

{
  "requires": true,
  "lockfileVersion": 1,
  "dependencies": {
    "base62": {
      "version": "2.0.1",
      "resolved": "https://registry.npmjs.org/base62/-/base62-2.0.1.tgz",
      "integrity": "sha512-4t4WQK7mdbcWzqEBiq6tfo2qDCeIZGXvjifJZyxHIVcjQkZJxpFtu/pa2Va69OouCkg6izZ08hKnPxroeDyzew=="
    },
    "denque": {
      "version": "1.4.1",
      "resolved": "https://registry.npmjs.org/denque/-/denque-1.4.1.tgz",
      "integrity": "sha512-OfzPuSZKGcgr96rf1oODnfjqBFmr1DVoc/TrItj3Ohe0Ah1C5WX5Baquw/9U9KovnQ88EqmJbD66rKYUQYN1tQ=="
    },
    "redis": {
      "version": "3.0.2",
      "resolved": "https://registry.npmjs.org/redis/-/redis-3.0.2.tgz",
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      "requires": {
        "denque": "^1.4.1",
        "redis-commands": "^1.5.0",
        "redis-errors": "^1.2.0",
        "redis-parser": "^3.0.0"
      }
    },
    "redis-commands": {
      "version": "1.6.0",
      "resolved": "https://registry.npmjs.org/redis-commands/-/redis-commands-1.6.0.tgz",
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    },
    "redis-errors": {
      "version": "1.2.0",
      "resolved": "https://registry.npmjs.org/redis-errors/-/redis-errors-1.2.0.tgz",
      "integrity": "sha1-62LSrbFeTq9GEMBK/hUpOEJQq60="
    },
    "redis-parser": {
      "version": "3.0.0",
      "resolved": "https://registry.npmjs.org/redis-parser/-/redis-parser-3.0.0.tgz",
      "integrity": "sha1-tm2CjNyv5rS4pCin3vTGvKwxyLQ=",
      "requires": {
        "redis-errors": "^1.0.0"
      }
    }
  }
}