Ethereal Secrets Middleware

An express middleware to expose a REST endpoint to issue secrets for client to encrypt their local stores with (the so called local mode) or to store encrypted data for later retrieval (remote mode). The keys and the cipher texts are stored in a Redis DB. Each entry in the database is assigned a time-to-live thus making the secretes ethereal.

Local mode

let app = express();
app.use(
  '/secrets',
  etherealSecrets({
    local: {
      ttl: 15 * 60,
      cookie: {
        secret: 'icanhazcheezburger?',
      },
    },
    redis: {
      client: new IORedis(),
    },
  }),
);

If a client now issues GET /secrets the API will return JSON in the form of:

{
  "key": "<the key>"
}

Along with a cookie containing a session ID. On subsequent requests the same key is returned as long as the session is valid and the same cookie is sent with the request.

Remote mode

let app = express();
app.use(
  '/secrets',
  etherealSecrets({
    remote: {
      defaultTtl: 24 * 60 * 60,
    },
    redis: {
      host: 'redis',
    },
  }),
);

If a client issues POST /secrets with arbitrary data as post body parameter data, the API will return status code 201 and JSON in the form of:

{
  "key": "<the key>"
}

If a client now accesses GET /secrets/<the key> the API will return JSON in the form of:

{
  "data": "<the data>"
}