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import * as OTP from 'https://deno.land/x/otpauth@v9.0.2/dist/otpauth.esm.js'
export default {  /**   * Create a random secret.   */  secret(length = 64) {    return [...Array(length)].map(() =>      Math.floor(Math.random() * 16).toString(16)    ).join('')  },
  /**   * Get the 6-digit token for a given timestamp.   */  token(secret: string, timestamp?: number) {    const totp = new OTP.TOTP({      algorithm: 'SHA1',      digits: 6,      period: 30,      secret: OTP.Secret.fromHex(secret)    })      return totp.generate({ timestamp })  },
  /**   * Create a URI that you can use, for example, for a QR code to scan with Google Authenticator.   */  uri(label: string, issuer: string, secret: string) {    const totp = new OTP.TOTP({      issuer,      label,      algorithm: 'SHA1',      digits: 6,      period: 30,      secret: OTP.Secret.fromHex(secret)    })      return totp.toString()  },
  /**   * Determine if the token is valid.   */  validate(token: string, secret: string) {    const totp = new OTP.TOTP({      algorithm: 'SHA1',      digits: 6,      period: 30,      secret: OTP.Secret.fromHex(secret)    })      return totp.validate({ token }) === 0  }}