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import { v4 as uuidv4 } from 'uuid'
import crypto from 'crypto'
/**
* Generates a unique token.
* @param {number} length - The desired length of the token. Must be at least 8. Default: 20.
* @param {'alphanumeric' | 'hexadecimal'} mode - The mode of the token, either 'alphanumeric' or 'hexadecimal'. Default: 'alphanumeric'.
* @returns {string} - A unique token of the specified length.
* @throws {Error} - Throws an error if the length is less than 8.
* @note - The function generates a token based on a UUID and ensures uniqueness. A cache is used to avoid collisions.
*/
export function generateUniqueToken(length: number = 20, mode: 'alphanumeric' | 'hexadecimal' = 'alphanumeric'): string {
if (length < 8) {
throw new Error('Length must be at least 8 characters.')
}
const charset = mode === 'alphanumeric'
? 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
: '0123456789abcdef'
let token: string
token = uuidv4().replace(/-/g, '')
const randomValues = new Uint8Array(length)
crypto.getRandomValues(randomValues)
if (mode === 'alphanumeric') {
token = Array.from(token)
.map(char => charset.includes(char) ? char : charset[Math.floor(Math.random() * charset.length)])
.join('')
}
while (token.length < length) {
token += charset[randomValues[token.length % length] % charset.length]
}
return token.slice(0, length)
}
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