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const KEY_FILE = "keys.json";
const len = 32;
const keys = {
    "k1":crypto.randomBytes(len).toString('hex'),
    "k2":crypto.randomBytes(len).toString('hex'),
    "k3":crypto.randomBytes(len).toString('hex'),
};
fs.writeFileSync(KEY_FILE, JSON.stringify(keys));


const createKeyHolder = function() {
   let keyHolder = utils.createObject("JWT_KEY_HOLDER"); 

   keyHolder.loadKeyFile = function(keyFile) {
        const keyfileContents = fs.readFileSync(keyFile);
        const keys = JSON.parse(keyfileContents);

        for(kid in keys) {
            this[kid] = keys[kid];
            this.logger.log(`Loaded key with id: ${kid}`);
        }
   }

   keyHolder.getKey = function(kid) {
    this.logger.log(`Attempting to retrieve key with key id ${kid}`);
    if(kid in this) {
         this.logger.log(`Key[${kid}] found.`);
         return this[kid];
    }
    this.logger.log(`Key[${kid}] not found!`);
    return null;
   }

   return keyHolder;
}