[JWT] decode/sign

jwt.js

const asyncVerify = nodeUtil.promisify(jwt.verify)
const JWT_SECRET = 'jwt.secret'

const f = {}

f.signToken = (id) => {
   // 24 hours
   let tokenExpiry = 60 * 60 * 24
   return jwt.sign(
      {
         username: id
      },
      JWT_SECRET,
      { expiresIn: tokenExpiry }
   )
}

f.decodeToken = async token => {
   try {
      const decoded = await asyncVerify(token, JWT_SECRET)
      return decoded
   } catch (err) {
      if (err instanceof jwt.JsonWebTokenError) {
         if (
            err.name == 'JsonWebTokenError' ||
            err.name == 'TokenExpiredError'
         ) {
            return Promise.reject(new AuthenticationError())
         } else if (err.name == 'NotBeforeError') {
            // not before mech
            return Promise.reject(
               new AuthenticationError('Cannot used token before.')
            )
         }
      }
      // Catch the JWT Expired or Invalid errors
      return Promise.reject(new OtherErrors())
   }
}