Audio Block: Do not persist blob urls and fix undo

docs/reference-guides/core-blocks.md

@@ -24,7 +24,7 @@ Embed a simple audio player. ([Source](https://github.com/WordPress/gutenberg/tr
 -	**Name:** core/audio
 -	**Category:** media
 -	**Supports:** align, anchor, interactivity (clientNavigation), spacing (margin, padding)
--	**Attributes:** autoplay, caption, id, loop, preload, src
+-	**Attributes:** autoplay, blob, caption, id, loop, preload, src
 
 ## Avatar
 

packages/block-library/src/audio/block.json

@@ -8,6 +8,10 @@
 	"keywords": [ "music", "sound", "podcast", "recording" ],
 	"textdomain": "default",
 	"attributes": {
+		"blob": {
+			"type": "string",
+			"__experimentalRole": "local"
+		},
 		"src": {
 			"type": "string",
 			"source": "attribute",

packages/block-library/src/audio/edit.js

@@ -26,6 +26,7 @@ import { __, _x } from '@wordpress/i18n';
 import { useDispatch } from '@wordpress/data';
 import { audio as icon } from '@wordpress/icons';
 import { store as noticesStore } from '@wordpress/notices';
+import { useState } from '@wordpress/element';
 
 /**
  * Internal dependencies
@@ -45,10 +46,10 @@ function AudioEdit( {
 	insertBlocksAfter,
 } ) {
 	const { id, autoplay, loop, preload, src } = attributes;
-	const isTemporaryAudio = ! id && isBlobURL( src );
+	const [ temporaryURL, setTemporaryURL ] = useState( attributes.blob );
 
 	useUploadMediaFromBlobURL( {
-		url: src,
+		url: temporaryURL,
 		allowedTypes: ALLOWED_MEDIA_TYPES,
 		onChange: onSelectAudio,
 		onError: onUploadError,
@@ -72,7 +73,8 @@ function AudioEdit( {
 				onReplace( embedBlock );
 				return;
 			}
-			setAttributes( { src: newSrc, id: undefined } );
+			setAttributes( { src: newSrc, id: undefined, blob: undefined } );
+			setTemporaryURL();
 		}
 	}
 
@@ -95,27 +97,37 @@ function AudioEdit( {
 				src: undefined,
 				id: undefined,
 				caption: undefined,
+				blob: undefined,
 			} );
+			setTemporaryURL();
 			return;
 		}
+
+		if ( isBlobURL( media.url ) ) {
+			setTemporaryURL( media.url );
+			return;
+		}
+
 		// Sets the block's attribute and updates the edit component from the
 		// selected media, then switches off the editing UI.
 		setAttributes( {
+			blob: undefined,
 			src: media.url,
 			id: media.id,
 			caption: media.caption,
 		} );
+		setTemporaryURL();
 	}
 
 	const classes = clsx( className, {
-		'is-transient': isTemporaryAudio,
+		'is-transient': !! temporaryURL,
 	} );
 
 	const blockProps = useBlockProps( {
 		className: classes,
 	} );
 
-	if ( ! src ) {
+	if ( ! src && ! temporaryURL ) {
 		return (
 			<div { ...blockProps }>
 				<MediaPlaceholder
@@ -190,9 +202,9 @@ function AudioEdit( {
 					file or change the position slider when the controls are enabled.
 				*/ }
 				<Disabled isDisabled={ ! isSingleSelected }>
-					<audio controls="controls" src={ src } />
+					<audio controls="controls" src={ src ?? temporaryURL } />
 				</Disabled>
-				{ isTemporaryAudio && <Spinner /> }
+				{ !! temporaryURL && <Spinner /> }
 				<Caption
 					attributes={ attributes }
 					setAttributes={ setAttributes }

packages/block-library/src/audio/transforms.js

@@ -20,7 +20,7 @@ const transforms = {
 				// It's already done as part of the `componentDidMount`
 				// in the audio block.
 				const block = createBlock( 'core/audio', {
-					src: createBlobURL( file ),
+					blob: createBlobURL( file ),
 				} );
 
 				return block;