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fix: add link rel=preload for exported sites

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This commit is contained in:
Nolan Lawson
2019-02-15 23:52:30 -08:00
parent 82e637ea7c
commit 351ab13d29
17 changed files with 358 additions and 30 deletions
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54
src/api/export.ts
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@@ -9,6 +9,7 @@ import clean_html from './utils/clean_html';
import minify_html from './utils/minify_html';
import Deferred from './utils/Deferred';
import { noop } from './utils/noop';
import { parse as parseLinkHeader } from 'http-link-header';
type Opts = {
build_dir?: string,
@@ -21,6 +22,12 @@ type Opts = {
onfile?: ({ file, size, status }: { file: string, size: number, status: number }) => void;
};
type Ref = {
uri: string,
rel: string,
as: string
};
function resolve(from: string, to: string) {
return url.parse(url.resolve(from, to));
}
@@ -139,38 +146,49 @@ async function _export({
clearTimeout(the_timeout); // prevent it hanging at the end
let type = r.headers.get('Content-Type');
let body = await r.text();
const range = ~~(r.status / 100);
if (range === 2) {
if (type === 'text/html' && pathname !== '/service-worker-index.html') {
const cleaned = clean_html(body);
if (type === 'text/html') {
// parse link rel=preload headers and embed them in the HTML
let link = parseLinkHeader(r.headers.get('Link') || '');
link.refs.forEach((ref: Ref) => {
if (ref.rel === 'preload') {
body = body.replace('</head>',
`<link rel="preload" as=${JSON.stringify(ref.as)} href=${JSON.stringify(ref.uri)}></head>`)
}
});
if (pathname !== '/service-worker-index.html') {
const cleaned = clean_html(body);
const q = yootils.queue(8);
let promise;
const q = yootils.queue(8);
let promise;
const base_match = /<base ([\s\S]+?)>/m.exec(cleaned);
const base_href = base_match && get_href(base_match[1]);
const base = resolve(url.href, base_href);
const base_match = /<base ([\s\S]+?)>/m.exec(cleaned);
const base_href = base_match && get_href(base_match[1]);
const base = resolve(url.href, base_href);
let match;
let pattern = /<a ([\s\S]+?)>/gm;
let match;
let pattern = /<a ([\s\S]+?)>/gm;
while (match = pattern.exec(cleaned)) {
const attrs = match[1];
const href = get_href(attrs);
while (match = pattern.exec(cleaned)) {
const attrs = match[1];
const href = get_href(attrs);
if (href) {
const url = resolve(base.href, href);
if (href) {
const url = resolve(base.href, href);
if (url.protocol === protocol && url.host === host) {
promise = q.add(() => handle(url));
if (url.protocol === protocol && url.host === host) {
promise = q.add(() => handle(url));
}
}
}
}
await promise;
await promise;
}
}
}