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Copy pathiframe.ts
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Copy pathiframe.ts
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134 lines (116 loc) · 3.97 KB
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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
/**
* Represents a window in a possible chain of iframes
*/
export interface IWindowChainElement {
/**
* The window object for it
*/
window: Window;
/**
* The iframe element inside the window.parent corresponding to window
*/
iframeElement: HTMLIFrameElement | null;
}
let hasDifferentOriginAncestorFlag: boolean = false;
let sameOriginWindowChainCache: IWindowChainElement[] | null = null;
function getParentWindowIfSameOrigin(w: Window): Window | null {
if (!w.parent || w.parent === w) {
return null;
}
// Cannot really tell if we have access to the parent window unless we try to access something in it
try {
let location = w.location;
let parentLocation = w.parent.location;
if (location.protocol !== parentLocation.protocol || location.hostname !== parentLocation.hostname || location.port !== parentLocation.port) {
hasDifferentOriginAncestorFlag = true;
return null;
}
} catch (e) {
hasDifferentOriginAncestorFlag = true;
return null;
}
return w.parent;
}
function findIframeElementInParentWindow(parentWindow: Window, childWindow: Window): HTMLIFrameElement | null {
let parentWindowIframes = parentWindow.document.getElementsByTagName('iframe');
let iframe: HTMLIFrameElement;
for (let i = 0, len = parentWindowIframes.length; i < len; i++) {
iframe = parentWindowIframes[i];
if (iframe.contentWindow === childWindow) {
return iframe;
}
}
return null;
}
export class IframeUtils {
/**
* Returns a chain of embedded windows with the same origin (which can be accessed programmatically).
* Having a chain of length 1 might mean that the current execution environment is running outside of an iframe or inside an iframe embedded in a window with a different origin.
* To distinguish if at one point the current execution environment is running inside a window with a different origin, see hasDifferentOriginAncestor()
*/
public static getSameOriginWindowChain(): IWindowChainElement[] {
if (!sameOriginWindowChainCache) {
sameOriginWindowChainCache = [];
let w: Window | null = window;
let parent: Window | null;
do {
parent = getParentWindowIfSameOrigin(w);
if (parent) {
sameOriginWindowChainCache.push({
window: w,
iframeElement: findIframeElementInParentWindow(parent, w)
});
} else {
sameOriginWindowChainCache.push({
window: w,
iframeElement: null
});
}
w = parent;
} while (w);
}
return sameOriginWindowChainCache.slice(0);
}
/**
* Returns true if the current execution environment is chained in a list of iframes which at one point ends in a window with a different origin.
* Returns false if the current execution environment is not running inside an iframe or if the entire chain of iframes have the same origin.
*/
public static hasDifferentOriginAncestor(): boolean {
if (!sameOriginWindowChainCache) {
this.getSameOriginWindowChain();
}
return hasDifferentOriginAncestorFlag;
}
/**
* Returns the position of `childWindow` relative to `ancestorWindow`
*/
public static getPositionOfChildWindowRelativeToAncestorWindow(childWindow: Window, ancestorWindow: Window | null) {
if (!ancestorWindow || childWindow === ancestorWindow) {
return {
top: 0,
left: 0
};
}
let top = 0, left = 0;
let windowChain = this.getSameOriginWindowChain();
for (const windowChainEl of windowChain) {
if (windowChainEl.window === ancestorWindow) {
break;
}
if (!windowChainEl.iframeElement) {
break;
}
let boundingRect = windowChainEl.iframeElement.getBoundingClientRect();
top += boundingRect.top;
left += boundingRect.left;
}
return {
top: top,
left: left
};
}
}