Fix mp3 uploads on chrome

utils/mediaupload.js

@@ -1,7 +1,7 @@
 /**
  * External Dependencies
  */
-import { compact, forEach, get, includes, noop, startsWith } from 'lodash';
+import { compact, flatMap, forEach, get, includes, map, noop, startsWith } from 'lodash';
 
 /**
  * WordPress dependencies
@@ -13,6 +13,30 @@ import { __, sprintf } from '@wordpress/i18n';
  */
 import apiRequest from '@wordpress/api-request';
 
+/**
+ * Browsers may use unexpected mime types, and they differ from browser to browser.
+ * This function computes a flexible array of mime types from the mime type structured provided by the server.
+ * Converts { jpg|jpeg|jpe: "image/jpeg" } into [ "image/jpeg", "image/jpg", "image/jpeg", "image/jpe" ]
+ * The computation of this array instead of directly using the object,
+ * solves the problem in chrome where mp3 files have audio/mp3 as mime type instead of audio/mpeg.
+ * https://bugs.chromium.org/p/chromium/issues/detail?id=227004
+ *
+ * @param {?Object} wpMimeTypesObject Mime type object received from the server.
+ *                                    Extensions are keys separated by '|' and values are mime types associated with an extension.
+ *
+ * @return {?Array} Media Object Promise.
+ */
+export function getMimeTypesArray( wpMimeTypesObject ) {
+	if ( ! wpMimeTypesObject ) {
+		return wpMimeTypesObject;
+	}
+	return flatMap( wpMimeTypesObject, ( mime, extensionsString ) => {
+		const [ type ] = mime.split( '/' );
+		const extensions = extensionsString.split( '|' );
+		return [ mime, ...map( extensions, ( extension ) => `${ type }/${ extension }` ) ];
+	} );
+}
+
 /**
  *	Media Upload is used by audio, image, gallery and video blocks to handle uploading a media file
  *	when a file upload button is activated.
@@ -48,7 +72,7 @@ export function mediaUpload( {
 	const isAllowedType = ( fileType ) => startsWith( fileType, `${ allowedType }/` );
 
 	// Allowed types for the current WP_User
-	const allowedMimeTypesForUser = get( window, [ '_wpMediaSettings', 'allowedMimeTypes' ] );
+	const allowedMimeTypesForUser = getMimeTypesArray( get( window, [ '_wpMediaSettings', 'allowedMimeTypes' ] ) );
 	const isAllowedMimeTypeForUser = ( fileType ) => {
 		return includes( allowedMimeTypesForUser, fileType );
 	};

utils/test/mediaupload.js

@@ -3,7 +3,7 @@
 /**
  * Internal dependencies
  */
-import { mediaUpload } from '../mediaupload';
+import { mediaUpload, getMimeTypesArray } from '../mediaupload';
 
 // mediaUpload is passed the onImagesChange function
 // so we can stub that out have it pass the data to
@@ -79,3 +79,50 @@ describe( 'mediaUpload', () => {
 		} );
 	} );
 } );
+
+describe( 'getMimeTypesArray', () => {
+	it( 'should return the parameter passed if it is "falsy" e.g: undefined or null', () => {
+		expect( getMimeTypesArray( null ) ).toEqual( null );
+		expect( getMimeTypesArray( undefined ) ).toEqual( undefined );
+	} );
+
+	it( 'should return an empty array if an empty object is passed', () => {
+		expect( getMimeTypesArray( {} ) ).toEqual( [] );
+	} );
+
+	it( 'should return the type plus a new mime type with type and subtype with the extension if a type is passed', () => {
+		expect(
+			getMimeTypesArray( { ext: 'chicken' } )
+		).toEqual(
+			[ 'chicken', 'chicken/ext' ]
+		);
+	} );
+
+	it( 'should return the mime type passed and a new mime type with type and the extension as subtype', () => {
+		expect(
+			getMimeTypesArray( { ext: 'chicken/ribs' } )
+		).toEqual(
+			[ 'chicken/ribs', 'chicken/ext' ]
+		);
+	} );
+
+	it( 'should return the mime type passed and an additional mime type per extension supported', () => {
+		expect(
+			getMimeTypesArray( { 'jpg|jpeg|jpe': 'image/jpeg' } )
+		).toEqual(
+			[ 'image/jpeg', 'image/jpg', 'image/jpeg', 'image/jpe' ]
+		);
+	} );
+
+	it( 'should handle multiple mime types', () => {
+		expect(
+			getMimeTypesArray( { 'ext|aaa': 'chicken/ribs', aaa: 'bbb' } )
+		).toEqual( [
+			'chicken/ribs',
+			'chicken/ext',
+			'chicken/aaa',
+			'bbb',
+			'bbb/aaa',
+		] );
+	} );
+} );