[RNMobile] Limit inner blocks nesting depth to avoid call stack size exceeded crash

packages/block-editor/src/components/inner-blocks/constants.native.js

@@ -0,0 +1,5 @@
+// Hermes has a limit for the call stack depth to avoid infinite recursion.
+// When creating a deep nested structure of inner blocks, the editor might exceed
+// this limit and crash. In order to avoid this, we set a maximum depth level where
+// we stop rendering blocks.
+export const MAX_NESTING_DEPTH = 10;

packages/block-editor/src/components/inner-blocks/index.native.js

@@ -3,6 +3,7 @@
  */
 import { __unstableGetInnerBlocksProps as getInnerBlocksProps } from '@wordpress/blocks';
 import { useRef } from '@wordpress/element';
+import { useSelect } from '@wordpress/data';
 
 /**
  * Internal dependencies
@@ -21,6 +22,9 @@ import { useBlockEditContext } from '../block-edit/context';
 import useBlockSync from '../provider/use-block-sync';
 import { BlockContextProvider } from '../block-context';
 import { defaultLayout, LayoutProvider } from '../block-list/layout';
+import { store as blockEditorStore } from '../../store';
+import WarningMaxDepthExceeded from './warning-max-depth-exceeded';
+import { MAX_NESTING_DEPTH } from './constants';
 
 /**
  * This hook is used to lightly mark an element as an inner blocks wrapper
@@ -122,6 +126,17 @@ function UncontrolledInnerBlocks( props ) {
 		templateInsertUpdatesSelection
 	);
 
+	const nestingLevel = useSelect(
+		( select ) => {
+			return select( blockEditorStore ).getBlockParents( clientId )
+				?.length;
+		},
+		[ clientId ]
+	);
+	if ( nestingLevel >= MAX_NESTING_DEPTH ) {
+		return <WarningMaxDepthExceeded clientId={ clientId } />;
+	}
+
 	return (
 		<LayoutProvider value={ layout }>
 			<BlockContextProvider value={ context }>

packages/block-editor/src/components/inner-blocks/warning-max-depth-exceeded.native.js

@@ -0,0 +1,100 @@
+/**
+ * External dependencies
+ */
+import { TouchableWithoutFeedback, View } from 'react-native';
+
+/**
+ * WordPress dependencies
+ */
+import { __, sprintf } from '@wordpress/i18n';
+import { useState } from '@wordpress/element';
+import { useDispatch, useSelect } from '@wordpress/data';
+
+/**
+ * Internal dependencies
+ */
+import Warning from '../warning';
+import UnsupportedBlockDetails from '../unsupported-block-details';
+import { store as blockEditorStore } from '../../store';
+import { MAX_NESTING_DEPTH } from './constants';
+import useUnsupportedBlockEditor from '../use-unsupported-block-editor';
+
+const WarningMaxDepthExceeded = ( { clientId } ) => {
+	const [ showDetails, setShowDetails ] = useState( false );
+
+	const { isSelected, innerBlocks } = useSelect(
+		( select ) => {
+			const { getBlock, isBlockSelected } = select( blockEditorStore );
+			return {
+				innerBlocks: getBlock( clientId )?.innerBlocks || [],
+				isSelected: isBlockSelected( clientId ),
+			};
+		},
+		[ clientId ]
+	);
+	const { replaceBlocks } = useDispatch( blockEditorStore );
+
+	const {
+		isUnsupportedBlockEditorSupported,
+		canEnableUnsupportedBlockEditor,
+	} = useUnsupportedBlockEditor( clientId );
+
+	const onUngroup = () => {
+		if ( ! innerBlocks.length ) {
+			return;
+		}
+
+		replaceBlocks( clientId, innerBlocks );
+	};
+
+	let description;
+	// When UBE can't be used, the description mentions using the web browser to edit the block.
+	if (
+		! isUnsupportedBlockEditorSupported &&
+		! canEnableUnsupportedBlockEditor
+	) {
+		/* translators: Warning related to having blocks deeply nested. %d: The deepest nesting level. */
+		const descriptionFormat = __(
+			'Blocks nested deeper than %d levels may not render properly in the mobile editor. For this reason, we recommend flattening the content by ungrouping the block or editing the block using your web browser.'
+		);
+		description = sprintf( descriptionFormat, MAX_NESTING_DEPTH );
+	}
+	// Otherwise, the description mentions using the web editor (i.e. UBE).
+	else {
+		/* translators: Warning related to having blocks deeply nested. %d: The deepest nesting level. */
+		const descriptionFormat = __(
+			'Blocks nested deeper than %d levels may not render properly in the mobile editor. For this reason, we recommend flattening the content by ungrouping the block or editing the block using the web editor.'
+		);
+		description = sprintf( descriptionFormat, MAX_NESTING_DEPTH );
+	}
+
+	return (
+		<TouchableWithoutFeedback
+			disabled={ ! isSelected }
+			accessibilityLabel={ __( 'Warning message' ) }
+			accessibilityRole={ 'button' }
+			accessibilityHint={ __( 'Tap here to show more details.' ) }
+			onPress={ () => setShowDetails( true ) }
+		>
+			<View>
+				<Warning
+					message={ __(
+						'Block cannot be rendered because it is deeply nested. Tap here for more details.'
+					) }
+				/>
+				<UnsupportedBlockDetails
+					clientId={ clientId }
+					showSheet={ showDetails }
+					onCloseSheet={ () => setShowDetails( false ) }
+					title={ __( 'Deeply nested block' ) }
+					description={ description }
+					customActions={ [
+						{ label: __( 'Ungroup block' ), onPress: onUngroup },
+					] }
+				/>
+			</View>
+		</TouchableWithoutFeedback>
+	);
+};
+
+export default WarningMaxDepthExceeded;

packages/block-editor/src/components/unsupported-block-details/index.native.js

@@ -0,0 +1,183 @@
+/**
+ * External dependencies
+ */
+import { View, Text } from 'react-native';
+
+/**
+ * WordPress dependencies
+ */
+import { BottomSheet, Icon, TextControl } from '@wordpress/components';
+import {
+	requestUnsupportedBlockFallback,
+	sendActionButtonPressedAction,
+	actionButtons,
+} from '@wordpress/react-native-bridge';
+import { help } from '@wordpress/icons';
+import { __ } from '@wordpress/i18n';
+import { usePreferredColorSchemeStyle } from '@wordpress/compose';
+import { getBlockType } from '@wordpress/blocks';
+import { useCallback, useState } from '@wordpress/element';
+import { applyFilters } from '@wordpress/hooks';
+
+/**
+ * Internal dependencies
+ */
+import styles from './style.scss';
+import useUnsupportedBlockEditor from '../use-unsupported-block-editor';
+
+const EMPTY_ARRAY = [];
+
+const UnsupportedBlockDetails = ( {
+	clientId,
+	showSheet,
+	onCloseSheet,
+	customBlockTitle = '',
+	icon,
+	title,
+	description,
+	actionButtonLabel,
+	customActions = EMPTY_ARRAY,
+} ) => {
+	const [ sendFallbackMessage, setSendFallbackMessage ] = useState( false );
+	const [ sendButtonPressMessage, setSendButtonPressMessage ] =
+		useState( false );
+
+	const {
+		blockName,
+		blockContent,
+		isUnsupportedBlockEditorSupported,
+		canEnableUnsupportedBlockEditor,
+		isEditableInUnsupportedBlockEditor,
+	} = useUnsupportedBlockEditor( clientId );
+
+	// Styles
+	const textStyle = usePreferredColorSchemeStyle(
+		styles[ 'unsupported-block-details__text' ],
+		styles[ 'unsupported-block-details__text--dark' ]
+	);
+	const titleStyle = usePreferredColorSchemeStyle(
+		styles[ 'unsupported-block-details__title' ],
+		styles[ 'unsupported-block-details__title--dark' ]
+	);
+	const descriptionStyle = usePreferredColorSchemeStyle(
+		styles[ 'unsupported-block-details__description' ],
+		styles[ 'unsupported-block-details__description--dark' ]
+	);
+	const iconStyle = usePreferredColorSchemeStyle(
+		styles[ 'unsupported-block-details__icon' ],
+		styles[ 'unsupported-block-details__icon--dark' ]
+	);
+	const actionButtonStyle = usePreferredColorSchemeStyle(
+		styles[ 'unsupported-block-details__action-button' ],
+		styles[ 'unsupported-block-details__action-button--dark' ]
+	);
+
+	const blockTitle =
+		customBlockTitle || getBlockType( blockName )?.title || blockName;
+
+	const requestFallback = useCallback( () => {
+		if (
+			canEnableUnsupportedBlockEditor &&
+			isUnsupportedBlockEditorSupported === false
+		) {
+			onCloseSheet();
+			setSendButtonPressMessage( true );
+		} else {
+			onCloseSheet();
+			setSendFallbackMessage( true );
+		}
+	}, [
+		canEnableUnsupportedBlockEditor,
+		isUnsupportedBlockEditorSupported,
+		onCloseSheet,
+	] );
+
+	// The description can include extra notes via WP hooks.
+	const descriptionWithNotes = applyFilters(
+		'native.unsupported_block_details_extra_note',
+		description,
+		blockName
+	);
+
+	const webEditorDefaultLabel = applyFilters(
+		'native.unsupported_block_details_web_editor_action',
+		__( 'Edit using web editor' )
+	);
+
+	const canUseWebEditor =
+		( isUnsupportedBlockEditorSupported ||
+			canEnableUnsupportedBlockEditor ) &&
+		isEditableInUnsupportedBlockEditor;
+	const actions = [
+		...[
+			canUseWebEditor && {
+				label: actionButtonLabel || webEditorDefaultLabel,
+				onPress: requestFallback,
+			},
+		],
+		...customActions,
+	].filter( Boolean );
+
+	return (
+		<BottomSheet
+			isVisible={ showSheet }
+			hideHeader
+			onClose={ onCloseSheet }
+			onModalHide={ () => {
+				if ( sendFallbackMessage ) {
+					// On iOS, onModalHide is called when the controller is still part of the hierarchy.
+					// A small delay will ensure that the controller has already been removed.
+					this.timeout = setTimeout( () => {
+						// For the Classic block, the content is kept in the `content` attribute.
+						requestUnsupportedBlockFallback(
+							blockContent,
+							clientId,
+							blockName,
+							blockTitle
+						);
+					}, 100 );
+					setSendFallbackMessage( false );
+				} else if ( sendButtonPressMessage ) {
+					this.timeout = setTimeout( () => {
+						sendActionButtonPressedAction(
+							actionButtons.missingBlockAlertActionButton
+						);
+					}, 100 );
+					setSendButtonPressMessage( false );
+				}
+			} }
+		>
+			<View style={ styles[ 'unsupported-block-details__container' ] }>
+				<Icon
+					icon={ icon || help }
+					color={ iconStyle.color }
+					size={ iconStyle.size }
+				/>
+				<Text style={ [ textStyle, titleStyle ] }>{ title }</Text>
+				{ isEditableInUnsupportedBlockEditor &&
+					descriptionWithNotes && (
+						<Text style={ [ textStyle, descriptionStyle ] }>
+							{ descriptionWithNotes }
+						</Text>
+					) }
+			</View>
+			{ actions.map( ( { label, onPress }, index ) => (
+				<TextControl
+					key={ `${ label } - ${ index }` }
+					label={ label }
+					separatorType="topFullWidth"
+					onPress={ onPress }
+					labelStyle={ actionButtonStyle }
+				/>
+			) ) }
+			<TextControl
+				label={ __( 'Dismiss' ) }
+				separatorType="topFullWidth"
+				onPress={ onCloseSheet }
+				labelStyle={ actionButtonStyle }
+			/>
+		</BottomSheet>
+	);
+};
+
+export default UnsupportedBlockDetails;

packages/block-editor/src/components/unsupported-block-details/style.native.scss

@@ -0,0 +1,56 @@
+.unsupported-block-details__container {
+	flex-direction: column;
+	align-items: center;
+	justify-content: flex-end;
+}
+
+.unsupported-block-details__icon {
+	size: 36;
+	height: 36;
+	padding-top: 8;
+	padding-bottom: 8;
+	color: $gray;
+}
+
+.unsupported-block-details__icon--dark {
+	color: $gray-20;
+}
+
+.unsupported-block-details__text {
+	text-align: center;
+	color: $gray-dark;
+}
+
+.unsupported-block-details__text--dark {
+	color: $white;
+}
+
+.unsupported-block-details__title {
+	padding-top: 8;
+	padding-bottom: 12;
+	font-size: 20;
+	font-weight: bold;
+	color: $gray-dark;
+}
+
+.unsupported-block-details__title--dark {
+	color: $white;
+}
+
+.unsupported-block-details__description {
+	padding-bottom: 24;
+	font-size: 16;
+	color: $gray-darken-20;
+}
+
+.unsupported-block-details__description--dark {
+	color: $gray-20;
+}
+
+.unsupported-block-details__action-button {
+	color: $blue-50;
+}
+
+.unsupported-block-details__action-button--dark {
+	color: $blue-30;
+}