@ixo/supamoto-bot-sdk/module/utils/indexing.js

An SDK to easily interact with Supamoto bot db

import crypto from 'crypto';
function normalize(s) {
  return s.toLowerCase().replace(/[^a-z0-9]+/g, ' ').replace(/\s+/g, ' ') // collapse spaces
  .trim();
}
export function trigrams(s, size = 3) {
  const t = normalize(s);
  if (!t) return [];
  const grams = [];
  for (let i = 0; i <= t.length - size; i++) {
    grams.push(t.slice(i, i + size));
  }
  return Array.from(new Set(grams)); // dedupe
}
export function hmacBytes(msg, key) {
  return crypto.createHmac('sha256', key).update(msg).digest(); // 32-byte
}
export function hmacTrigrams(grams, key) {
  return grams.map(g => hmacBytes(g, key));
}
export function hmacCountry(country, key) {
  return hmacBytes(country.trim().toUpperCase(), key);
}