prevent trying to download blob URI

lib/single-file/single-file-core.js

@@ -332,8 +332,6 @@ const SingleFileCore = (() => {
 	// ---------
 	// DomHelper
 	// ---------
-	const DATA_URI_PREFIX = "data:";
-
 	class DomProcessorHelper {
 		static async resolveImportURLs(stylesheetContent, baseURI) {
 			stylesheetContent = DomUtil.removeCssComments(stylesheetContent);
@@ -342,7 +340,7 @@ const SingleFileCore = (() => {
 				const match = DomUtil.matchImport(cssImport);
 				if (match) {
 					const resourceURL = DomUtil.normalizeURL(match.resourceURL);
-					if (resourceURL != baseURI && !match.resourceURL.startsWith(DATA_URI_PREFIX)) {
+					if (resourceURL != baseURI && DomUtil.testValidPath(match.resourceURL)) {
 						let importedStylesheetContent = await Download.getContent(new URL(match.resourceURL, baseURI).href);
 						importedStylesheetContent = DomUtil.wrapMediaQuery(importedStylesheetContent, match.media);
 						if (stylesheetContent.indexOf(cssImport) != -1) {
@@ -364,7 +362,7 @@ const SingleFileCore = (() => {
 			urlFunctions.map(urlFunction => {
 				let resourceURL = DomUtil.matchURL(urlFunction);
 				resourceURL = DomUtil.normalizeURL(resourceURL);
-				if (resourceURL && resourceURL != baseURI && !resourceURL.startsWith(DATA_URI_PREFIX)) {
+				if (resourceURL && resourceURL != baseURI && DomUtil.testValidPath(resourceURL)) {
 					stylesheetContent = stylesheetContent.replace(urlFunction, urlFunction.replace(resourceURL, new URL(resourceURL, baseURI).href));
 				}
 			});
@@ -373,7 +371,7 @@ const SingleFileCore = (() => {
 
 		static async resolveLinkStylesheetURLs(resourceURL, baseURI, media) {
 			resourceURL = DomUtil.normalizeURL(resourceURL);
-			if (resourceURL && resourceURL != baseURI && !resourceURL.startsWith(DATA_URI_PREFIX)) {
+			if (resourceURL && resourceURL != baseURI && DomUtil.testValidPath(resourceURL)) {
 				let stylesheetContent = await Download.getContent(resourceURL);
 				stylesheetContent = await DomProcessorHelper.resolveImportURLs(stylesheetContent, resourceURL);
 				stylesheetContent = DomUtil.wrapMediaQuery(stylesheetContent, media);
@@ -386,7 +384,7 @@ const SingleFileCore = (() => {
 			await Promise.all(urlFunctions.map(async urlFunction => {
 				let resourceURL = DomUtil.matchURL(urlFunction);
 				resourceURL = DomUtil.normalizeURL(resourceURL);
-				if (resourceURL && resourceURL != baseURI && !resourceURL.startsWith(DATA_URI_PREFIX)) {
+				if (resourceURL && resourceURL != baseURI && DomUtil.testValidPath(resourceURL)) {
 					const dataURI = await batchRequest.addURL(resourceURL);
 					stylesheetContent = stylesheetContent.replace(urlFunction, urlFunction.replace(resourceURL, dataURI));
 				}
@@ -399,7 +397,7 @@ const SingleFileCore = (() => {
 				let resourceURL = resourceElement.getAttribute(attributeName);
 				if (resourceURL) {
 					resourceURL = DomUtil.normalizeURL(resourceURL);
-					if (resourceURL && resourceURL != baseURI && !resourceURL.startsWith(DATA_URI_PREFIX)) {
+					if (resourceURL && resourceURL != baseURI && DomUtil.testValidPath(resourceURL)) {
 						try {
 							const dataURI = await batchRequest.addURL(new URL(resourceURL, baseURI).href);
 							resourceElement.setAttribute(attributeName, dataURI);
@@ -417,7 +415,7 @@ const SingleFileCore = (() => {
 				const srcSet = await Promise.all(attributeValue.split(",").map(async src => {
 					let [resourceURL, descriptor] = src.trim().split(/\s+/);
 					resourceURL = DomUtil.normalizeURL(resourceURL);
-					if (resourceURL && resourceURL != baseURI && !resourceURL.startsWith(DATA_URI_PREFIX)) {
+					if (resourceURL && resourceURL != baseURI && DomUtil.testValidPath(resourceURL)) {
 						try {
 							const dataURI = await batchRequest.addURL(new URL(resourceURL, baseURI).href);
 							return dataURI + (descriptor ? " " + descriptor : "");
@@ -434,6 +432,8 @@ const SingleFileCore = (() => {
 	// -------
 	// DomUtil
 	// -------
+	const DATA_URI_PREFIX = "data:";
+	const BLOB_URI_PREFIX = "blob:";
 	const REGEXP_URL_FN = /(url\s*\(\s*'([^']*)'\s*\))|(url\s*\(\s*"([^"]*)"\s*\))|(url\s*\(\s*([^)]*)\s*\))/gi;
 	const REGEXP_URL_SIMPLE_QUOTES_FN = /^url\s*\(\s*'([^']*)'\s*\)$/i;
 	const REGEXP_URL_DOUBLE_QUOTES_FN = /^url\s*\(\s*"([^"]*)"\s*\)$/i;
@@ -466,6 +466,10 @@ const SingleFileCore = (() => {
 			return match && match[1];
 		}
 
+		static testValidPath(resourceURL) {
+			return !resourceURL.startsWith(DATA_URI_PREFIX) && !resourceURL.startsWith(BLOB_URI_PREFIX);
+		}
+
 		static matchImport(stylesheetContent) {
 			const match = stylesheetContent.match(REGEXP_IMPORT_URL_SIMPLE_QUOTES_FN) ||
 				stylesheetContent.match(REGEXP_IMPORT_URL_DOUBLE_QUOTES_FN) ||