keyring-node/sequelize.js at main · fnando/keyring-node · GitHub

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const Sequelize = require("sequelize");
const Keyring = require("./keyring").keyring;

function isString(value) {
  return typeof value === "string" || value instanceof String;
}

function getModelOptions(record) {
  // This handles the change introduced by sequelize@v6.
  return record._modelOptions || record.constructor.options;
}

function beforeSave(record, options) {
  const {
    keys,
    keyringIdColumn,
    encryption,
    columns,
    digestSalt,
  } = getModelOptions(record).keyring;

  const keyring = Keyring(keys, { encryption, digestSalt });

  columns.forEach((column) => {
    const digestColumn = `${column}_digest`;
    const value = record[column];
    let encrypted = null;
    let digest = null;
    let keyringId = record[keyringIdColumn] || keyring.currentId();

    if (isString(value)) {
      [encrypted, keyringId, digest] = keyring.encrypt(value);
    }

    record[`encrypted_${column}`] = encrypted;
    record[keyringIdColumn] = keyringId;

    // This handles the change introduced by sequelize@v5.
    const attributes =
      record.attributes || Object.keys(record.constructor.rawAttributes);

    if (attributes.includes(digestColumn)) {
      record[digestColumn] = digest;
    }
  });
}

function afterFind(record) {
  if (!record) {
    return;
  } else if (record instanceof Array) {
    return record.map(afterFind);
  }

  const {
    keys,
    keyringIdColumn,
    encryption,
    columns,
    digestSalt,
  } = getModelOptions(record).keyring;

  const keyring = Keyring(keys, { encryption, digestSalt });
  const keyringId = record[keyringIdColumn];

  columns.forEach((column) => {
    const keyringId = record[keyringIdColumn];
    const encrypted = record[`encrypted_${column}`];
    const value = isString(encrypted)
      ? keyring.decrypt(encrypted, keyringId)
      : null;
    record[column] = value;
  });
}

function setup(
  model,
  {
    keys,
    columns,
    digestSalt,
    encryption = "aes-128-cbc",
    keyringIdColumn = "keyring_id",
  },
) {
  model.options.keyring = {
    keys,
    columns,
    encryption,
    keyringIdColumn,
    digestSalt,
  };
  model.beforeSave(beforeSave);
  model.afterFind(afterFind);
}

module.exports = setup;