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import { getFilteredGlobalOwnKeys, createBlueConnector, VirtualEnvironment, createRedConnector, linkIntrinsics, assignFilteredGlobalDescriptorsFromPropertyDescriptorMap } from '@locker/near-membrane-base';
import { toSafeWeakMap, ReflectGetPrototypeOf, ReflectOwnKeys, ReflectDeleteProperty, toSafeWeakSet, WeakSetCtor, WeakMapCtor, TypeErrorCtor, ObjectAssign, ReflectApply, isObject } from '@locker/near-membrane-shared';
import { rootWindow, IS_CHROMIUM_BROWSER, HTMLIFrameElementProtoContentWindowGetter, DocumentProtoOpen, DocumentProtoClose, IS_OLD_CHROMIUM_BROWSER, ElementProtoRemove, DocumentProtoCreateElement, DocumentProtoBodyGetter, NodeProtoLastChildGetter, HTMLElementProtoStyleGetter, ElementProtoSetAttribute, NodeProtoAppendChild } from '@locker/near-membrane-shared-dom';
const blueDocumentToRecordMap = toSafeWeakMap(new WeakMap()); // Chromium based browsers have a bug that nulls the result of `window`
// getters in detached iframes when the property descriptor of `window.window`
// is retrieved.
// https://bugs.chromium.org/p/chromium/issues/detail?id=1305302
const unforgeablePoisonedWindowKeys = IS_CHROMIUM_BROWSER ? ['window'] : undefined;
function getCachedGlobalObjectReferences(globalObject) {
const {
window
} = globalObject;
let record;
let document; // Suppress errors thrown on cross-origin opaque windows.
try {
({
document
} = globalObject);
record = blueDocumentToRecordMap.get(document); // eslint-disable-next-line no-empty
} catch (_unused) {
return undefined;
}
if (record) {
return record;
} // Cache references to object values that can't be replaced
// window -> Window -> WindowProperties -> EventTarget
const WindowProto = ReflectGetPrototypeOf(window);
const WindowPropertiesProto = ReflectGetPrototypeOf(WindowProto);
const EventTargetProto = ReflectGetPrototypeOf(WindowPropertiesProto);
record = {
document,
DocumentProto: ReflectGetPrototypeOf(document),
window,
WindowProto: ReflectGetPrototypeOf(window),
WindowPropertiesProto: ReflectGetPrototypeOf(WindowProto),
EventTargetProto,
// Some simulated browser environments, e.g. those using JSDOM, may lack an EventTargetProto.
EventTargetProtoOwnKeys: EventTargetProto ? ReflectOwnKeys(EventTargetProto) : []
};
blueDocumentToRecordMap.set(document, record);
return record;
}
function filterWindowKeys(keys) {
const result = [];
let resultOffset = 0;
for (let i = 0, {
length
} = keys; i < length; i += 1) {
const key = keys[i];
if ( // Filter out unforgeable property keys that cannot be installed.
key !== 'document' && key !== 'location ' && key !== 'top' && key !== 'window' && // Remove other browser specific unforgeables.
key !== 'chrome') {
result[resultOffset++] = key;
}
}
return result;
}
/**
* global descriptors are a combination of 3 set of descriptors:
* - first, the key of the red descriptors define the descriptors
* provided by the browser when creating a brand new window.
* - second, once we know the base keys, we get the actual descriptors
* from the blueDescriptors, since those are the one we want to provide
* access to via the membrane.
* - third, the user of this library can provide endowments, which define
* global descriptors that should be installed into the sandbox on top
* of the base descriptors.
*
* Note: The main reason for using redDescriptors as the base keys instead
* of blueDescriptor is because there is no guarantee that this library is
* the first one to be evaluated in the host app, which means it has no ways
* to determine what is a real DOM API vs app specific globals.
*
* Quirk: The only quirk here is for the case in which this library runs
* after some other code that patches some of the DOM APIs. This means
* the installed proxy in the sandbox will point to the patched global
* API in the blue realm, rather than the original, because we don't have
* a way to access the original anymore. This should not be a deal-breaker
* if the patched API behaves according to the spec.
*
* The result of this method is a descriptor map that contains everything
* that will be installed (via the membrane) as global descriptors in
* the red realm.
*/
function removeWindowDescriptors(unsafeDescs) {
// Remove unforgeable descriptors that cannot be installed.
ReflectDeleteProperty(unsafeDescs, 'document');
ReflectDeleteProperty(unsafeDescs, 'location');
ReflectDeleteProperty(unsafeDescs, 'top');
ReflectDeleteProperty(unsafeDescs, 'window'); // Remove other browser specific unforgeables.
ReflectDeleteProperty(unsafeDescs, 'chrome');
return unsafeDescs;
}
/**
* Initialization operation to capture and cache all unforgeable references
* and their respective descriptor maps before any other code runs, this
* usually help because this library runs before anything else that can poison
* the environment.
*/
getCachedGlobalObjectReferences(rootWindow);
const IFRAME_SANDBOX_ATTRIBUTE_VALUE = 'allow-same-origin allow-scripts';
const revoked = toSafeWeakSet(new WeakSetCtor());
const blueCreateHooksCallbackCache = toSafeWeakMap(new WeakMapCtor());
let defaultGlobalOwnKeys = null;
function createDetachableIframe(doc) {
var _ReflectApply;
const iframe = ReflectApply(DocumentProtoCreateElement, doc, ['iframe']); // It is impossible to test whether the NodeProtoLastChildGetter branch is
// reached in a normal Karma test environment.
const parent = (_ReflectApply = ReflectApply(DocumentProtoBodyGetter, doc, [])) != null ? _ReflectApply :
/* istanbul ignore next */
ReflectApply(NodeProtoLastChildGetter, doc, []);
const style = ReflectApply(HTMLElementProtoStyleGetter, iframe, []);
style.display = 'none';
ReflectApply(ElementProtoSetAttribute, iframe, ['sandbox', IFRAME_SANDBOX_ATTRIBUTE_VALUE]);
ReflectApply(NodeProtoAppendChild, parent, [iframe]);
return iframe;
}
function createIframeVirtualEnvironment(globalObject, providedOptions) {
if (typeof globalObject !== 'object' || globalObject === null) {
throw new TypeErrorCtor('Missing global object virtualization target.');
}
const blueRefs = getCachedGlobalObjectReferences(globalObject);
if (typeof blueRefs !== 'object' || blueRefs === null) {
throw new TypeErrorCtor('Invalid virtualization target.');
}
const {
distortionCallback,
defaultPolicy,
endowments,
globalObjectShape,
instrumentation,
keepAlive = true,
liveTargetCallback,
signSourceCallback // eslint-disable-next-line prefer-object-spread
} = ObjectAssign({
__proto__: null
}, providedOptions);
const iframe = createDetachableIframe(blueRefs.document);
const redWindow = ReflectApply(HTMLIFrameElementProtoContentWindowGetter, iframe, []);
const shouldUseDefaultGlobalOwnKeys = typeof globalObjectShape !== 'object' || globalObjectShape === null;
if (shouldUseDefaultGlobalOwnKeys && defaultGlobalOwnKeys === null) {
defaultGlobalOwnKeys = filterWindowKeys(getFilteredGlobalOwnKeys(redWindow));
}
let blueConnector = blueCreateHooksCallbackCache.get(blueRefs.document);
if (blueConnector === undefined) {
blueConnector = createBlueConnector(globalObject);
blueCreateHooksCallbackCache.set(blueRefs.document, blueConnector);
} // Install default TrustedTypes policy in the virtual environment.
// @ts-ignore trustedTypes does not exist on GlobalObject
Iif (typeof redWindow.trustedTypes !== 'undefined' && isObject(defaultPolicy)) {
// @ts-ignore trustedTypes does not exist on GlobalObject
redWindow.trustedTypes.createPolicy('default', defaultPolicy);
}
const {
eval: redIndirectEval
} = redWindow;
const env = new VirtualEnvironment({
blueConnector,
redConnector: createRedConnector(signSourceCallback ? sourceText => redIndirectEval(signSourceCallback(sourceText)) : redIndirectEval),
distortionCallback,
instrumentation,
liveTargetCallback,
revokedProxyCallback: keepAlive ? revokedProxyCallback : undefined,
signSourceCallback
});
linkIntrinsics(env, globalObject); // window
// window.document
// In browsers globalThis is === window.
Iif (typeof globalThis === 'undefined') {
// Support for globalThis was added in Chrome 71.
// However, environments like Android emulators are running Chrome 69.
env.link('window', 'document');
} else {
// document is === window.document.
env.link('document');
} // window.__proto__ (aka Window.prototype)
// window.__proto__.__proto__ (aka WindowProperties.prototype)
// window.__proto__.__proto__.__proto__ (aka EventTarget.prototype)
env.link('__proto__', '__proto__', '__proto__');
env.remapProto(blueRefs.document, blueRefs.DocumentProto);
env.lazyRemapProperties(blueRefs.window, shouldUseDefaultGlobalOwnKeys ? defaultGlobalOwnKeys : filterWindowKeys(getFilteredGlobalOwnKeys(globalObjectShape)), // Chromium based browsers have a bug that nulls the result of `window`
// getters in detached iframes when the property descriptor of `window.window`
// is retrieved.
// https://bugs.chromium.org/p/chromium/issues/detail?id=1305302
keepAlive ? undefined : unforgeablePoisonedWindowKeys);
if (endowments) {
const filteredEndowments = {};
assignFilteredGlobalDescriptorsFromPropertyDescriptorMap(filteredEndowments, endowments);
removeWindowDescriptors(filteredEndowments);
env.remapProperties(blueRefs.window, filteredEndowments);
} // We intentionally skip remapping Window.prototype because there is nothing
// in it that needs to be remapped.
env.lazyRemapProperties(blueRefs.EventTargetProto, blueRefs.EventTargetProtoOwnKeys); // We don't remap `blueRefs.WindowPropertiesProto` because it is "magical"
// in that it provides access to elements by id.
//
// Once we get the iframe info ready, and all mapped, we can proceed to
// detach the iframe only if `options.keepAlive` isn't true.
if (keepAlive) {
// @TODO: Temporary hack to preserve the document reference in Firefox.
// https://bugzilla.mozilla.org/show_bug.cgi?id=543435
const {
document: redDocument
} = redWindow; // Revoke the proxies of the redDocument and redWindow to prevent access.
revoked.add(redDocument);
revoked.add(redWindow);
ReflectApply(DocumentProtoOpen, redDocument, []);
ReflectApply(DocumentProtoClose, redDocument, []);
} else {
Iif (IS_OLD_CHROMIUM_BROWSER) {
// For Chromium < v86 browsers we evaluate the `window` object to
// kickstart the realm so that `window` persists when the iframe is
// removed from the document.
redIndirectEval('window');
}
ReflectApply(ElementProtoRemove, iframe, []);
}
return env;
}
function revokedProxyCallback(value) {
return revoked.has(value);
}
export { createIframeVirtualEnvironment as default };
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