@resourcefulhumans/rheactor-aws-lambda/dist/handler.js

Core components for RESTful AWS lambda endpoints

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.handler = handler;

var _bluebird = require('bluebird');

var _bluebird2 = _interopRequireDefault(_bluebird);

var _api = require('./api');

var _rheactorModels = require('rheactor-models');

var _rheactorValueObjects = require('rheactor-value-objects');

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * @param {String} contentType
 * @param {String} environment
 * @param {String} tokenSecretOrPrivateKey
 * @param {Array.<Function>} operations
 * @param {{headers: object, path: string, httpMethod: string, body: string, queryStringParameters: object, requestContext: object}} event
 * @param {object} context
 * @param {function} callback
 */
function handler(contentType, environment, tokenSecretOrPrivateKey, operations, event, context, callback) {
  var statusCode = 200;
  var done = function done(err, res) {
    /* istanbul ignore next */
    if (err && environment !== 'testing') console.error(err);
    if (err && !(err instanceof _rheactorModels.HttpProblem)) {
      err = new _rheactorModels.HttpProblem(new _rheactorValueObjects.URIValue('https://github.com/ResourcefulHumans/rheactor-aws-lambda#' + err.constructor.name), err.message, 400);
    }
    return callback(null, {
      statusCode: err ? err.status : res ? statusCode : 204,
      body: JSON.stringify(err || res),
      headers: {
        'Content-Type': contentType,
        'Access-Control-Allow-Origin': '*'
      }
    });
  };

  var allowedMethods = /^(GET|POST)$/;

  _bluebird2.default.try(function () {
    (0, _api.checkContentType)(event, contentType);
    var parts = event.path.split('/');
    parts.shift();
    var operation = parts.shift();
    if (!operation.length || !operations[operation]) throw new _rheactorModels.HttpProblem(new _rheactorValueObjects.URIValue('https://github.com/ResourcefulHumans/rheactor-aws-lambda#Error'), 'Unknown operation "' + event.path + '"', 404);
    if (!allowedMethods.test(event.httpMethod)) {
      throw new _rheactorModels.HttpProblem(new _rheactorValueObjects.URIValue('https://github.com/ResourcefulHumans/rheactor-aws-lambda#Error'), 'Method not allowed: "' + event.httpMethod + '"', 405);
    }
    var method = event.httpMethod.toLowerCase();
    if (typeof operations[operation][method] === 'undefined') {
      throw new _rheactorModels.HttpProblem(new _rheactorValueObjects.URIValue('https://github.com/ResourcefulHumans/rheactor-aws-lambda#Error'), 'Unsupported operation "' + event.httpMethod + ' ' + event.path + '"', 400);
    }
    var body = event.body ? JSON.parse(event.body) : {};
    return (0, _api.getOptionalToken)(event, tokenSecretOrPrivateKey).then(function (token) {
      return operations[operation][method](body, parts, token, event.queryStringParameters, event.requestContext);
    });
  }).then(function (res) {
    return done(null, res);
  }).catch(function (err) {
    return done(err);
  });
}