storeKeyFile.js

/*
 * Stores an ejson keypair in the `ejson-keys` directory.
 */
const fs = require("fs");
const path = require("path");

/**
 * Create an `ejson` key file in the local 'ejson-keys' directory from the
 * process environment (expecting `EJSON_PUBLIC_KEY`, and `EJSON_PRIVATE_KEY`).
 */
function createKeyFile() {
  if (!process.env.EJSON_PUBLIC_KEY || process.env.EJSON_PUBLIC_KEY.length < 0) {
    console.error("Please specify a EJSON_PUBLIC_KEY environment variable");
    process.exit(1);
  }
  if (!process.env.EJSON_PRIVATE_KEY || process.env.EJSON_PRIVATE_KEY.length < 0) {
    console.error("Please specify a EJSON_PRIVATE_KEY environment variable");
    process.exit(1);
  }
  const publicKey = process.env.EJSON_PUBLIC_KEY;
  const privateKey = process.env.EJSON_PRIVATE_KEY;
  const writeDir = path.resolve(".", "ejson-keys");
  const dest = path.join(writeDir, publicKey);
  fs.mkdirSync(writeDir, { recursive: true });
  fs.writeFileSync(dest, privateKey);
}

createKeyFile();