/**

* @license

* Copyright Google Inc. All Rights Reserved.

*

* Use of this source code is governed by an MIT-style license that can be

* found in the LICENSE file at https://angular.io/license

*/

/**

* @fileoverview

* @suppress {globalThis}

*/

import * as webSocketPatch from './websocket';

export function propertyDescriptorLegacyPatch(api: _ZonePrivate, _global: any) {

const {isNode, isMix} = api.getGlobalObjects()!;

if (isNode && !isMix) {

return;

}

if (!canPatchViaPropertyDescriptor(api, _global)) {

const supportsWebSocket = typeof WebSocket !== 'undefined';

// Safari, Android browsers (Jelly Bean)

patchViaCapturingAllTheEvents(api);

api.patchClass('XMLHttpRequest');

if (supportsWebSocket) {

webSocketPatch.apply(api, _global);

}

(Zone as any)[api.symbol('patchEvents')] = true;

}

}

function canPatchViaPropertyDescriptor(api: _ZonePrivate, _global: any) {

const {isBrowser, isMix} = api.getGlobalObjects()!;

if ((isBrowser || isMix) &&

!api.ObjectGetOwnPropertyDescriptor(HTMLElement.prototype, 'onclick') &&

typeof Element !== 'undefined') {

// WebKit https://bugs.webkit.org/show_bug.cgi?id=134364

// IDL interface attributes are not configurable

const desc = api.ObjectGetOwnPropertyDescriptor(Element.prototype, 'onclick');

if (desc && !desc.configurable) return false;

// try to use onclick to detect whether we can patch via propertyDescriptor

// because XMLHttpRequest is not available in service worker

if (desc) {

api.ObjectDefineProperty(Element.prototype, 'onclick', {

enumerable: true,

configurable: true,

get: function() {

return true;

}

});

const div = document.createElement('div');

const result = !!div.onclick;

api.ObjectDefineProperty(Element.prototype, 'onclick', desc);

return result;

}

}

const XMLHttpRequest = _global['XMLHttpRequest'];

if (!XMLHttpRequest) {

// XMLHttpRequest is not available in service worker

return false;

}

const ON_READY_STATE_CHANGE = 'onreadystatechange';

const XMLHttpRequestPrototype = XMLHttpRequest.prototype;

const xhrDesc =

api.ObjectGetOwnPropertyDescriptor(XMLHttpRequestPrototype, ON_READY_STATE_CHANGE);

// add enumerable and configurable here because in opera

// by default XMLHttpRequest.prototype.onreadystatechange is undefined

// without adding enumerable and configurable will cause onreadystatechange

// non-configurable

// and if XMLHttpRequest.prototype.onreadystatechange is undefined,

// we should set a real desc instead a fake one

if (xhrDesc) {

api.ObjectDefineProperty(XMLHttpRequestPrototype, ON_READY_STATE_CHANGE, {

enumerable: true,

configurable: true,

get: function() {

return true;

}

});

const req = new XMLHttpRequest();

const result = !!req.onreadystatechange;

// restore original desc

api.ObjectDefineProperty(XMLHttpRequestPrototype, ON_READY_STATE_CHANGE, xhrDesc || {});

return result;

} else {

const SYMBOL_FAKE_ONREADYSTATECHANGE = api.symbol('fake');

api.ObjectDefineProperty(XMLHttpRequestPrototype, ON_READY_STATE_CHANGE, {

enumerable: true,

configurable: true,

get: function() {

return this[SYMBOL_FAKE_ONREADYSTATECHANGE];

},

set: function(value) {

this[SYMBOL_FAKE_ONREADYSTATECHANGE] = value;

}

});

const req = new XMLHttpRequest();

const detectFunc = () => {};

req.onreadystatechange = detectFunc;

const result = (req as any)[SYMBOL_FAKE_ONREADYSTATECHANGE] === detectFunc;

req.onreadystatechange = null as any;

return result;

}

}

// Whenever any eventListener fires, we check the eventListener target and all parents

// for `onwhatever` properties and replace them with zone-bound functions

// - Chrome (for now)

function patchViaCapturingAllTheEvents(api: _ZonePrivate) {

const {eventNames} = api.getGlobalObjects()!;

const unboundKey = api.symbol('unbound');

for (let i = 0; i < eventNames.length; i++) {

const property = eventNames[i];

const onproperty = 'on' + property;

self.addEventListener(property, function(event) {

let elt: any = <Node>event.target, bound, source;

if (elt) {

source = elt.constructor['name'] + '.' + onproperty;

} else {

source = 'unknown.' + onproperty;

}

while (elt) {

if (elt[onproperty] && !elt[onproperty][unboundKey]) {

bound = api.wrapWithCurrentZone(elt[onproperty], source);

bound[unboundKey] = elt[onproperty];

elt[onproperty] = bound;

}

elt = elt.parentElement;

}

}, true);

}

}