SQL Operations Studio Public Preview 1 (0.23) release source code

src/vs/base/browser/iframe.ts

@@ -0,0 +1,135 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+'use strict';
+
+/**
+ * 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;
+}
+
+let hasDifferentOriginAncestorFlag: boolean = false;
+let sameOriginWindowChainCache: IWindowChainElement[] = null;
+
+function getParentWindowIfSameOrigin(w: Window): Window {
+	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 {
+	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, parent: Window;
+			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: any) {
+
+		if (!ancestorWindow || childWindow === ancestorWindow) {
+			return {
+				top: 0,
+				left: 0
+			};
+		}
+
+		let top = 0, left = 0;
+
+		let windowChain = this.getSameOriginWindowChain();
+
+		for (let i = 0; i < windowChain.length; i++) {
+			let windowChainEl = windowChain[i];
+
+			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
+		};
+	}
+}