aaronjameslang / claudia-api-jwt-authenticator

import {

    GetPublicKeyOrSecret as GetPublicKeyOrSecretCb,

    JwtHeader,

    Secret,

    SigningKeyCallback

} from 'jsonwebtoken'

export {

    JwtHeader,

    Secret,

    SigningKeyCallback

} from 'jsonwebtoken'

export type GetPublicKeyOrSecretPromise =

    (header: JwtHeader) => Promise<Secret>

export type SecretOrPublicKeyCb = string | Buffer | GetPublicKeyOrSecretCb

export type SecretOrPublicKeyCbP = SecretOrPublicKeyCb | GetPublicKeyOrSecretPromise

const depromisify = (key: SecretOrPublicKeyCbP): SecretOrPublicKeyCb => {

  if (typeof key === 'string' || key instanceof Buffer) {

    return key

  }

  const getKey: GetPublicKeyOrSecretCb | GetPublicKeyOrSecretPromise = key

  return (header: JwtHeader, callback: SigningKeyCallback): void => {

    const promise: Promise<Secret> | void = getKey(header, callback)

    if (promise) {

      promise

        .then((secret: Secret) => callback(null, secret))

        .catch((err: any) => callback(err))

    }

  }

}

export default depromisify