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fix: remote CSS does not get rebuilt properly #226

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Merged
billyvg merged 1 commit into from
Dec 10, 2024
Merged

fix: remote CSS does not get rebuilt properly #226

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25 changes: 15 additions & 10 deletions packages/rrweb/src/replay/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1835,17 +1835,22 @@ export class Replayer {
const newSn = mirror.getMeta(
target as Node & RRNode,
) as serializedElementNodeWithId;
Object.assign(
newSn.attributes,
mutation.attributes as attributes,
const newNode = buildNodeWithSN(
{
...newSn,
attributes: {
...newSn.attributes,
...(mutation.attributes as attributes),
},
},
{
doc: target.ownerDocument as Document, // can be Document or RRDocument
mirror: mirror as Mirror,
skipChild: true,
hackCss: true,
cache: this.cache,
},
);
const newNode = buildNodeWithSN(newSn, {

@billyvg billyvg Dec 6, 2024

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If you look above at the Object.assign call, you'll see that we mutate the meta object reference from the mirror and pass it to buildNodeWithSN(). Looking inside of buildNodeWithSN() you can see that it ends up comparing the same object reference and returning the node from the mirror instead of building a new node.

if (mirror.has(n.id)) {
    const nodeInMirror = mirror.getNode(n.id)!;
    const meta = mirror.getMeta(nodeInMirror)!;
    if (isNodeMetaEqual(meta, n)) return mirror.getNode(n.id);
  }

This meant that remote stylesheets were always loaded remotely (even if you inline) and could be blocked by CORS, making the inlined CSS rules unused.

doc: target.ownerDocument as Document, // can be Document or RRDocument
mirror: mirror as Mirror,
skipChild: true,
hackCss: true,
cache: this.cache,
});
const siblingNode = target.nextSibling;
const parentNode = target.parentNode;
if (newNode && parentNode) {
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60 changes: 60 additions & 0 deletions packages/rrweb/test/__snapshots__/replayer.test.ts.snap
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Original file line number Diff line number Diff line change
Expand Up @@ -144,6 +144,66 @@ file-cid-3
"
`;

exports[`replayer can handle remote stylesheets 1`] = `
"file-frame-2
<html>
<head>
<meta http-equiv=\\"Content-Type\\" content=\\"text/html; charset=UTF-8\\" />
</head>
<body>
<div class=\\"replayer-wrapper\\">
<iframe
sandbox=\\"allow-same-origin\\"
scrolling=\\"no\\"
width=\\"1000\\"
height=\\"800\\"
style=\\"display: inherit; pointer-events: none\\"
></iframe>
</div>
</body>
</html>


file-frame-3
<html>
<head>
<meta http-equiv=\\"Content-Type\\" content=\\"text/html; charset=UTF-8\\" />
<link rel=\\"stylesheet\\" type=\\"text/css\\" href=\\"file-cid-0\\" />
<link rel=\\"stylesheet\\" type=\\"text/css\\" href=\\"file-cid-1\\" />
</head>
<body></body>
</html>


file-cid-0
@charset \\"utf-8\\";

.rr-block { background: currentcolor; }

noscript { display: none !important; }

html.rrweb-paused *, html.rrweb-paused ::before, html.rrweb-paused ::after { animation-play-state: paused !important; }


file-cid-1
@charset \\"utf-8\\";

.OverlayDrawer-modal-187 { }

.OverlayDrawer-paper-188 { width: 100%; }

@media (min-width: 48em) {
.OverlayDrawer-paper-188 { width: 38rem; }
}

@media (min-width: 48em) {
}

@media (min-width: 48em) {
}
"
`;

exports[`replayer can handle removing style elements 1`] = `
"file-frame-1
<html>
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18 changes: 18 additions & 0 deletions packages/rrweb/test/replayer.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@ import {
launchPuppeteer,
sampleEvents as events,
sampleStyleSheetRemoveEvents as stylesheetRemoveEvents,
sampleRemoteStyleSheetEvents as remoteStyleSheetEvents,
waitForRAF,
} from './utils';
import styleSheetRuleEvents from './events/style-sheet-rule-events';
Expand Down Expand Up @@ -210,6 +211,23 @@ describe('replayer', function () {
await assertDomSnapshot(page);
});

it('can handle remote stylesheets', async () => {
await page.evaluate(`events = ${JSON.stringify(remoteStyleSheetEvents)}`);
const actionLength = await page.evaluate(`
const { Replayer } = rrweb;
const replayer = new Replayer(events);
replayer.play(2500);
replayer['timer']['actions'].length;
`);
expect(actionLength).toEqual(
remoteStyleSheetEvents.filter(
(e) => e.timestamp - remoteStyleSheetEvents[0].timestamp >= 2500,
).length,
);

await assertDomSnapshot(page);
});

it('can fast forward selection events', async () => {
await page.evaluate(`events = ${JSON.stringify(selectionEvents)}`);

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92 changes: 92 additions & 0 deletions packages/rrweb/test/utils.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -559,6 +559,98 @@ export const sampleStyleSheetRemoveEvents: eventWithTime[] = [
},
];

export const sampleRemoteStyleSheetEvents: eventWithTime[] = [
{
type: EventType.DomContentLoaded,
data: {},
timestamp: now,
},
{
type: EventType.Load,
data: {},
timestamp: now + 1000,
},
{
type: EventType.Meta,
data: {
href: 'http://localhost',
width: 1000,
height: 800,
},
timestamp: now + 1000,
},
{
type: EventType.FullSnapshot,
data: {
node: {
type: 0,
childNodes: [
{
type: 2,
tagName: 'html',
attributes: {},
childNodes: [
{
type: 2,
tagName: 'head',
attributes: {},
childNodes: [
{
type: 2,
tagName: 'link',
attributes: {
rel: 'stylesheet',
href: '',
},
childNodes: [],
id: 4,
},
],
id: 3,
},
{
type: 2,
tagName: 'body',
attributes: {},
childNodes: [],
id: 6,
},
],
id: 2,
},
],
id: 1,
},
initialOffset: {
top: 0,
left: 0,
},
},
timestamp: now + 1000,
},
{
type: EventType.IncrementalSnapshot,
data: {
source: IncrementalSource.Mutation,
texts: [],
attributes: [
{
id: 4,
attributes: {
href: null,
rel: null,
_cssText:
'.OverlayDrawer-modal-187 { }.OverlayDrawer-paper-188 { width: 100%; }@media (min-width: 48em) {\n .OverlayDrawer-paper-188 { width: 38rem; }\n}@media (min-width: 48em) {\n}@media (min-width: 48em) {\n}',
},
},
],
removes: [],
adds: [],
},
timestamp: now + 2000,
},
];

export const polyfillWebGLGlobals = () => {
// polyfill as jsdom does not have support for these classes
// consider replacing with https://www.npmjs.com/package/canvas
Expand Down