MongoDB Client-Side Field Level Encryption with Lambda - Not working example

mongo-fle-lambda-not-working.js

const { Binary, MongoClient } = require("mongodb");
const path = require("path");

const connectionString =
  "mongodb+srv://OMMITED.mongodb.net/yourDatabase?retryWrites=true&w=majority";
const keyVaultNamespace = "yourDatabase.__keyVault";
const base64KeyId = "OMITTED";

const createSchema = () => {
  return {
    "yourDatabase.test": {
      bsonType: "object",
      encryptMetadata: {
        keyId: [new Binary(Buffer.from(base64KeyId, "base64"), 4)],
      },
      properties: {
        foo: {
          encrypt: {
            bsonType: "string",
            algorithm: "AEAD_AES_256_CBC_HMAC_SHA_512-Deterministic",
          },
        },
      },
    },
  };
};

const kmsProviders = {
  aws: {
    accessKeyId: "OMITTED",
    secretAccessKey: "OMITTED",
  },
};

module.exports.hello = async (event) => {
  const secureClient = new MongoClient(connectionString, {
    connectTimeoutMS: 7000,
    useNewUrlParser: true,
    useUnifiedTopology: true,
    autoEncryption: {
      keyVaultNamespace,
      kmsProviders,
      schemaMap: createSchema()
    },
  });

  await secureClient.connect();

  const collection = secureClient.db("development").collection("test");

  await collection.insertOne({
    foo: "bar",
  });

  const resp = await collection.find({}).toArray();

  return {
    statusCode: 200,
    body: JSON.stringify(resp),
  };
};