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support dns-prefetch #535

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merged 1 commit into from
Dec 20, 2023
Merged

support dns-prefetch #535

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13 changes: 10 additions & 3 deletions webf/lib/src/html/head.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
* Copyright (C) 2019-2022 The Kraken authors. All rights reserved.
* Copyright (C) 2022-present The WebF authors. All rights reserved.
*/
import 'dart:io';

import 'package:flutter/scheduler.dart';
import 'package:webf/css.dart';
Expand Down Expand Up @@ -29,6 +30,7 @@ class HeadElement extends Element {
}

const String _REL_STYLESHEET = 'stylesheet';
const String DNS_PREFETCH = 'dns-prefetch';

// https://www.w3.org/TR/2011/WD-html5-author-20110809/the-link-element.html#the-link-element
class LinkElement extends Element {
Expand Down Expand Up @@ -98,13 +100,18 @@ class LinkElement extends Element {
set type(String value) {
internalSetAttribute('type', value);
}

void _resolveHyperlink() {
Future<void> _resolveHyperlink() async {
String? href = getAttribute('href');
String? rel = getAttribute('rel');
if (href != null) {
String base = ownerDocument.controller.url;
try {
_resolvedHyperlink = ownerDocument.controller.uriParser!.resolve(Uri.parse(base), Uri.parse(href));
Uri hrefUri = Uri.parse(href);
if (rel != null && rel == DNS_PREFETCH) {
await InternetAddress.lookup(hrefUri.host);
}

_resolvedHyperlink = ownerDocument.controller.uriParser!.resolve(Uri.parse(base), hrefUri);
} catch (_) {
// Ignoring the failure of resolving, but to remove the resolved hyperlink.
_resolvedHyperlink = null;
Expand Down
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