f-intercept/lib/index.js

a thin wrapper around the fetch api to provide you with a subscribe function to intercept 401 status responses, uses @export-mike/efetch for caching etags

'use strict';

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

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol ? "symbol" : typeof obj; };

var _fEtag = require('f-etag');

var _fEtag2 = _interopRequireDefault(_fEtag);

var _isomorphicFetch = require('isomorphic-fetch');

var _isomorphicFetch2 = _interopRequireDefault(_isomorphicFetch);

var _curry = require('curry');

var _curry2 = _interopRequireDefault(_curry);

var _url = require('url');

var _url2 = _interopRequireDefault(_url);

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

var subscribers = {};
var UNAUTH = 401;

var intercept = function intercept(base, path, options, response) {
  // interception
  if (response.status && response.status === UNAUTH) {
    var subscribersForBase = subscribers[base];
    if (subscribersForBase) {
      try {
        subscribersForBase.forEach(function (cb) {
          return cb(response.clone());
        });
      } catch (e) {
        // we dont want this error going up the parent chain in userland as its a different chain
        if (process.NODE_ENV !== 'production') {
          console.error('Unhandled Exception in onUnauth subscriber', e); // eslint-disable-line
        }
      }
    }
  }
  // continue promise chain
  return response;
};

var f = function f(base, path, options) {
  if ((typeof base === 'undefined' ? 'undefined' : _typeof(base)) === 'object' && !base.etagCaching) {
    var fetchFn = base.globalFetch ? fetch : _isomorphicFetch2.default;

    return fetchFn(_url2.default.resolve(base.base, path), options).then((0, _curry2.default)(intercept)(base.base, path, options));
  }

  return (0, _fEtag2.default)(_url2.default.resolve(base, path), options).then((0, _curry2.default)(intercept)(base, path, options));
};

var onUnauth = exports.onUnauth = function onUnauth(base, cb) {
  var subscribersForBase = subscribers[base];

  if (!subscribersForBase) {
    subscribers[base] = [cb];
  }

  subscribersForBase = subscribers[base];

  subscribersForBase.push(cb);

  return function () {
    subscribersForBase = subscribersForBase.filter(function (s) {
      return s !== cb;
    });
  };
};

exports.default = (0, _curry2.default)(f);