consul/ui/packages/consul-ui/app/utils/create-fingerprinter.js

import { get } from '@ember/object';
import { isEmpty } from '@ember/utils';

export default function (foreignKey, nspaceKey, partitionKey, hash = JSON.stringify) {
  return function (primaryKey, slugKey, foreignKeyValue, nspaceValue, partitionValue) {
    return function (item) {
      foreignKeyValue = foreignKeyValue == null ? item[foreignKey] : foreignKeyValue;
      if (foreignKeyValue == null) {
        throw new Error(
          `Unable to create fingerprint, missing foreignKey value. Looking for value in \`${foreignKey}\` got \`${foreignKeyValue}\``
        );
      }
      const slugKeys = slugKey.split(',');
      const slugValues = slugKeys
        .map(function (slugKey) {
          const slug = get(item, slugKey);

          const isSlugEmpty = isEmpty(slug);

          if (isSlugEmpty) {
            // PeerName should be optional as part of id
            if (slugKey === 'PeerName') {
              return;
            }
            throw new Error(
              `Unable to create fingerprint, missing slug. Looking for value in \`${slugKey}\` got \`${slug}\``
            );
          }
          return slug;
        })
        .compact();
      // This ensures that all data objects have a Namespace and a Partition
      // value set, even in OSS.
      if (typeof item[nspaceKey] === 'undefined') {
        if (nspaceValue === '*') {
          nspaceValue = 'default';
        }
        item[nspaceKey] = nspaceValue;
      }
      if (typeof item[partitionKey] === 'undefined') {
        if (partitionValue === '*') {
          partitionValue = 'default';
        }
        item[partitionKey] = partitionValue;
      }

      if (typeof item[foreignKey] === 'undefined') {
        item[foreignKey] = foreignKeyValue;
      }
      if (typeof item[primaryKey] === 'undefined') {
        item[primaryKey] = hash(
          [item[partitionKey], item[nspaceKey], foreignKeyValue].concat(slugValues)
        );
      }
      return item;
    };
  };
}