datapackage-registry/index.js

An API wrapper for a Data Package registry.

var _ = require('underscore');
var csv = require('csv');
var Promise = require('bluebird');
require('es6-promise').polyfill();
require('isomorphic-fetch');

var config = {
  backend: 'http://schemas.datapackages.org/registry.csv',
  objectwise: true,
};

function getCSVEndpoint(endpoint, objectwise) {
  /**
   * Return data from an endpoint that is parsable as CSV
   */

  return new Promise(function(resolve, reject) {
    fetch(endpoint).
        then(function(response) {
          if (response.status != 200) {
            reject('Bad response from server');
          }

          return response.text();
        }).then(function(text) {
          csv.parse(text, {columns: objectwise}, function(error, output) {
            if (error) {
              reject('Failed to parse registry file: ' + error);
            }

            resolve(output);
          });
        });
  });
}

function getRegistry(userConfig) {
  /**
   * Return the DataPackage Registry as an array of objects
   */

  // Replace default params with user config
  var customConfig = _.extend(config, userConfig);
  return getCSVEndpoint(customConfig.backend, customConfig.objectwise);
}

module.exports = {
  get: getRegistry,
};