Fix: Editing "Page" is broken for low capability users. (WordPress#68110

)

Co-authored-by: jorgefilipecosta <jorgefilipecosta@git.wordpress.org>
Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>
Co-authored-by: youknowriad <youknowriad@git.wordpress.org>
Co-authored-by: vipul0425 <vipulgupta003@git.wordpress.org>
Co-authored-by: Marc-pi <mdxfr@git.wordpress.org>

packages/core-data/src/private-selectors.ts

@@ -6,7 +6,12 @@ import { createSelector, createRegistrySelector } from '@wordpress/data';
 /**
  * Internal dependencies
  */
-import { getDefaultTemplateId, getEntityRecord, type State } from './selectors';
+import {
+	canUser,
+	getDefaultTemplateId,
+	getEntityRecord,
+	type State,
+} from './selectors';
 import { STORE_NAME } from './name';
 import { unlock } from './lock-unlock';
 
@@ -134,6 +139,13 @@ interface SiteData {
 export const getHomePage = createRegistrySelector( ( select ) =>
 	createSelector(
 		() => {
+			const canReadSiteData = select( STORE_NAME ).canUser( 'read', {
+				kind: 'root',
+				name: 'site',
+			} );
+			if ( ! canReadSiteData ) {
+				return null;
+			}
 			const siteData = select( STORE_NAME ).getEntityRecord(
 				'root',
 				'site'
@@ -156,7 +168,10 @@ export const getHomePage = createRegistrySelector( ( select ) =>
 			return { postType: 'wp_template', postId: frontPageTemplateId };
 		},
 		( state ) => [
-			getEntityRecord( state, 'root', 'site' ),
+			canUser( state, 'read', {
+				kind: 'root',
+				name: 'site',
+			} ) && getEntityRecord( state, 'root', 'site' ),
 			getDefaultTemplateId( state, {
 				slug: 'front-page',
 			} ),
@@ -165,6 +180,13 @@ export const getHomePage = createRegistrySelector( ( select ) =>
 );
 
 export const getPostsPageId = createRegistrySelector( ( select ) => () => {
+	const canReadSiteData = select( STORE_NAME ).canUser( 'read', {
+		kind: 'root',
+		name: 'site',
+	} );
+	if ( ! canReadSiteData ) {
+		return null;
+	}
 	const siteData = select( STORE_NAME ).getEntityRecord( 'root', 'site' ) as
 		| SiteData
 		| undefined;

packages/editor/src/components/provider/index.js

@@ -163,6 +163,7 @@ export const ExperimentalEditorProvider = withRegistryProvider(
 		BlockEditorProviderComponent = ExperimentalBlockEditorProvider,
 		__unstableTemplate: template,
 	} ) => {
+		const hasTemplate = !! template;
 		const {
 			editorSettings,
 			selection,
@@ -195,15 +196,17 @@ export const ExperimentalEditorProvider = withRegistryProvider(
 					isReady: __unstableIsEditorReady(),
 					mode: getRenderingMode(),
 					defaultMode:
-						postTypeObject?.default_rendering_mode ?? 'post-only',
+						hasTemplate && postTypeObject?.default_rendering_mode
+							? postTypeObject?.default_rendering_mode
+							: 'post-only',
 					selection: getEditorSelection(),
 					postTypeEntities:
 						post.type === 'wp_template'
 							? getEntitiesConfig( 'postType' )
 							: null,
 				};
 			},
-			[ post.type ]
+			[ post.type, hasTemplate ]
 		);
 
 		const shouldRenderTemplate = !! template && mode !== 'post-only';