@appzmonster/fetch-interceptor
Version:
Fetch-interceptor is a JavaScript library to enable request interceptor feature on Fetch API. The library extends Fetch API and uses fluent API design to allow chaining of one or multiple request interceptors to a Fetch API request.
215 lines (161 loc) • 9.34 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports["default"] = void 0;
var _BaseInterceptor2 = _interopRequireDefault(require("./BaseInterceptor"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { Promise.resolve(value).then(_next, _throw); } }
function _asyncToGenerator(fn) { return function () { var self = this, args = arguments; return new Promise(function (resolve, reject) { var gen = fn.apply(self, args); function _next(value) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value); } function _throw(err) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err); } _next(undefined); }); }; }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }
function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
var InvokeFetch = /*#__PURE__*/function (_BaseInterceptor) {
_inherits(InvokeFetch, _BaseInterceptor);
var _super = _createSuper(InvokeFetch);
function InvokeFetch(fetch) {
var _this;
_classCallCheck(this, InvokeFetch);
_this = _super.call(this); // Set the fetch function to execute in the context of window instead of
// instance of OutboundFetch (e.g. the "this" in fetch is set to window instead
// of instance of OutboundFetch). This is required to prevent browser from
// complaining illegal invocation of fetch.
_this._fetch = fetch.bind(window);
return _this;
}
_createClass(InvokeFetch, [{
key: "invoke",
value: function () {
var _invoke = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee(resource, init) {
return regeneratorRuntime.wrap(function _callee$(_context) {
while (1) {
switch (_context.prev = _context.next) {
case 0:
_context.next = 2;
return this._fetch(resource, init);
case 2:
return _context.abrupt("return", _context.sent);
case 3:
case "end":
return _context.stop();
}
}
}, _callee, this);
}));
function invoke(_x, _x2) {
return _invoke.apply(this, arguments);
}
return invoke;
}()
}]);
return InvokeFetch;
}(_BaseInterceptor2["default"]);
function initialize() {
if ('fetch' in window) {
/*
The following function is designed in such a way so that it can chain a list of 'with' interceptors
and finally invoke as a function.
Example:
fetch
.with(new A())
.with(new B())("http://file-api.appzmonster.com", {
method: 'GET',
mode: 'cors'
});
*/
var FetchManager = function FetchManager(interceptor) {
var _this2 = this;
if (_typeof(interceptor) !== 'object') {
throw new Error('Interceptor must be an instance of BaseInterceptor class');
}
this._interceptors = [].concat(interceptor);
var fetchRequest = /*#__PURE__*/function () {
var _ref = _asyncToGenerator( /*#__PURE__*/regeneratorRuntime.mark(function _callee2(resource, init) {
var i, _interceptor, interceptors;
return regeneratorRuntime.wrap(function _callee2$(_context2) {
while (1) {
switch (_context2.prev = _context2.next) {
case 0:
if (!(_this2._interceptors.length > 0)) {
_context2.next = 14;
break;
}
/*
Sample of interceptors:
A, B, C
Iteration (index = 2): interceptor = C
Iteration (index = 1): interceptor = C, B.setNextInterceptor(C), interceptor = B
Iteration (index = 0): interceptor = B, A.setNextInterceptor(B), interceptor = A
*/
i = 0;
_interceptor = null;
interceptors = _this2._interceptors.concat(new InvokeFetch(fetch));
for (i = interceptors.length - 1; i >= 0; i--) {
if (_interceptor != null) {
interceptors[i]._setNextInterceptor(_interceptor);
}
_interceptor = interceptors[i];
}
if (!(_interceptor != null)) {
_context2.next = 11;
break;
}
_context2.next = 8;
return _interceptor.invoke(resource, init);
case 8:
return _context2.abrupt("return", _context2.sent);
case 11:
return _context2.abrupt("return", null);
case 12:
_context2.next = 17;
break;
case 14:
_context2.next = 16;
return fetch(resource, init);
case 16:
return _context2.abrupt("return", _context2.sent);
case 17:
case "end":
return _context2.stop();
}
}
}, _callee2);
}));
return function fetchRequest(_x3, _x4) {
return _ref.apply(this, arguments);
};
}();
fetchRequest["with"] = function (interceptor) {
if (_typeof(interceptor) !== 'object') {
throw new Error('Interceptor must be an instance of BaseInterceptor class');
}
_this2._interceptors.push(interceptor);
return fetchRequest;
};
return fetchRequest;
};
if ('with' in window.fetch === true) {
if (typeof window.fetch["with"] !== 'function') {
console.error('Unable to enable fetch-interceptor feature to fetch api because \'with\' property is already in use');
return;
}
return;
}
var fetch = window.fetch;
fetch["with"] = function (interceptor) {
return new FetchManager(interceptor);
};
} else {
console.error('Unable to enable fetch-interceptor feature because browser does not support fetch api');
}
}
var _default = initialize;
exports["default"] = _default;