Merge branch 'update/embed-block' of github.com:WordPress/gutenberg i…

…nto update/embed-block

components/resizable-iframe/README.md

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+Resizable Iframe
+================
+
+Resizable Iframe is a React component for rendering an `<iframe>` element which can dynamically update its own dimensions using [`window.postMessage`](https://developer.mozilla.org/en-US/docs/Web/API/Window.postMessage). This is useful in cases where an inline frame of an unknown size is to be displayed on the page.
+
+## Example
+
+The `ResizableIframe` component can be used in much the same way that you would use an `<iframe>` DOM element. Props are automatically transferred to the rendered `<iframe>`, in case you need to specify additional properties or styles.
+
+```html
+<ResizableIframe src={ myFrameUrl } frameBorder={ 0 } />
+```
+
+## Usage
+
+To allow for resizing of the element, a `ResizableIframe` element listens for `message` events on the `window` object. If the rendered frame is not sandboxed, a script is injected in the frame to manage this behavior on your behalf. If the frame is sandboxed, any page you reference as the `src` URL is responsible for invoking this event using [`window.postMessage`](https://developer.mozilla.org/en-US/docs/Web/API/Window.postMessage). The message should be a JSON string with an `action` value of "resize" and a numeric `width` and `height` to define the new pixel dimensions of the element.
+
+For example, a page can trigger a resize using the following code snippet:
+
+```javascript
+if ( window.parent ) {
+	window.parent.postMessage( JSON.stringify( {
+		action: 'resize',
+		width: document.body.clientWidth,
+		height: document.body.clientHeight
+	} ), '*' );
+}
+```
+
+## Props
+
+### `src`
+
+Treated as the `src` URL to be used in the rendered `<iframe>` DOM element.
+
+### `width`
+
+An optional fixed width value, if you don't want this to be the responsibility of the child window.
+
+### `height`
+
+An optional fixed height value, if you don't want this to be the responsibility of the child window.
+
+### `onResize`
+
+An optional function to trigger when the rendered frame has been resized.

components/resizable-iframe/index.js

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+/**
+ * Imported from Calypso, with some lint fixes and gutenburg specific changes.
+ */
+
+/**
+ * External dependencies
+ */
+import { omit } from 'lodash';
+
+export default class ResizableIframe extends wp.element.Component {
+
+	constructor() {
+		super( ...arguments );
+		this.state = {
+			width: 0,
+			height: 0,
+		};
+		this.getFrameBody = this.getFrameBody.bind( this );
+		this.maybeConnect = this.maybeConnect.bind( this );
+		this.isFrameAccessible = this.isFrameAccessible.bind( this );
+		this.checkMessageForResize = this.checkMessageForResize.bind( this );
+	}
+
+	static get defaultProps() {
+		return {
+			onLoad: () => {},
+			onResize: () => {},
+			title: '',
+		};
+	}
+
+	componentDidMount() {
+		window.addEventListener( 'message', this.checkMessageForResize, false );
+		this.maybeConnect();
+	}
+
+	componentDidUpdate() {
+		this.maybeConnect();
+	}
+
+	componentWillUnmount() {
+		window.removeEventListener( 'message', this.checkMessageForResize );
+	}
+
+	getFrameBody() {
+		return this.iframe.contentDocument.body;
+	}
+
+	maybeConnect() {
+		if ( ! this.isFrameAccessible() ) {
+			return;
+		}
+
+		const body = this.getFrameBody();
+		if ( null !== body.getAttribute( 'data-resizable-iframe-connected' ) ) {
+			return;
+		}
+
+		const script = document.createElement( 'script' );
+		script.innerHTML = `
+			( function() {
+				var observer;
+
+				if ( ! window.MutationObserver || ! document.body || ! window.top ) {
+					return;
+				}
+
+				function sendResize() {
+					window.top.postMessage( {
+						action: 'resize',
+						width: document.body.offsetWidth,
+						height: document.body.offsetHeight
+					}, '*' );
+				}
+
+				observer = new MutationObserver( sendResize );
+				observer.observe( document.body, {
+					attributes: true,
+					attributeOldValue: false,
+					characterData: true,
+					characterDataOldValue: false,
+					childList: true,
+					subtree: true
+				} );
+
+				window.addEventListener( 'load', sendResize, true );
+
+				// Hack: Remove viewport unit styles, as these are relative
+				// the iframe root and interfere with our mechanism for
+				// determining the unconstrained page bounds.
+				function removeViewportStyles( ruleOrNode ) {
+					[ 'width', 'height', 'minHeight', 'maxHeight' ].forEach( function( style ) {
+						if ( /^\\d+(vmin|vmax|vh|vw)$/.test( ruleOrNode.style[ style ] ) ) {
+							ruleOrNode.style[ style ] = '';
+						}
+					} );
+				}
+
+				Array.prototype.forEach.call( document.querySelectorAll( '[style]' ), removeViewportStyles );
+				Array.prototype.forEach.call( document.styleSheets, function( stylesheet ) {
+					Array.prototype.forEach.call( stylesheet.cssRules || stylesheet.rules, removeViewportStyles );
+				} );
+
+				document.body.style.position = 'absolute';
+				document.body.setAttribute( 'data-resizable-iframe-connected', '' );
+
+				sendResize();
+			} )();
+		`;
+		body.appendChild( script );
+	}
+
+	isFrameAccessible() {
+		try {
+			return !! this.getFrameBody();
+		} catch ( e ) {
+			return false;
+		}
+	}
+
+	checkMessageForResize( event ) {
+		const iframe = this.iframe;
+
+		// Attempt to parse the message data as JSON if passed as string
+		let data = event.data || {};
+		if ( 'string' === typeof data ) {
+			try {
+				data = JSON.parse( data );
+			} catch ( e ) {} // eslint-disable-line no-empty
+		}
+
+		// Verify that the mounted element is the source of the message
+		if ( ! iframe || iframe.contentWindow !== event.source ) {
+			return;
+		}
+
+		// Update the state only if the message is formatted as we expect, i.e.
+		// as an object with a 'resize' action, width, and height
+		const { action, width, height } = data;
+		const { width: oldWidth, height: oldHeight } = this.state;
+
+		if ( 'resize' === action && ( oldWidth !== width || oldHeight !== height ) ) {
+			this.setState( { width, height } );
+			this.props.onResize();
+		}
+	}
+
+	onLoad( event ) {
+		this.maybeConnect();
+		this.props.onLoad( event );
+	}
+
+	render() {
+		const omitProps = [ 'onResize' ];
+
+		if ( ! this.props.src ) {
+			omitProps.push( 'src' );
+		}
+		return (
+			<iframe
+				ref={ ( node ) => this.iframe = node }
+				title={ this.props.title }
+				seamless="seamless"
+				scrolling="no"
+				{ ...omit( this.props, omitProps ) }
+				onLoad={ this.onLoad }
+				width={ this.props.width || this.state.width }
+				height={ this.props.height || this.state.height } />
+		);
+	}
+}

components/sandbox/index.js

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+/**
+ * Internal dependencies
+ */
+import ResizableIframe from 'components/resizable-iframe';
+
+export default class Sandbox extends wp.element.Component {
+
+	static get defaultProps() {
+		return {
+			html: '',
+			title: '',
+		};
+	}
+
+	componentDidMount() {
+		const body = this.node.getFrameBody();
+		const { html } = this.props;
+
+		body.innerHTML = html;
+
+		// setting the inner HTML will not cause scripts to load,
+		// so this prepares a bunch of new script elements and
+		// appends them to the iframe's body
+		const scripts = body.getElementsByTagName( 'script' );
+		const newscripts = [];
+
+		for ( let i = 0; i < scripts.length; i++ ) {
+			const newscript = document.createElement( 'script' );
+			if ( scripts[ i ].src ) {
+				newscript.src = scripts[ i ].src;
+			} else {
+				newscript.innerHTML = scripts[ i ].innerHTML;
+			}
+			newscripts.push( newscript );
+		}
+
+		for ( let i = 0; i < newscripts.length; i++ ) {
+			body.appendChild( newscripts[ i ] );
+		}
+	}
+
+	render() {
+		return (
+			<ResizableIframe
+				sandbox="allow-same-origin allow-scripts"
+				title={ this.props.title }
+				ref={ ( node ) => this.node = node } />
+		);
+	}
+}