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inlineImages: Setting of image.crossOrigin is not always necessary (#1468)

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Setting of the `crossorigin` attribute is not necessary for same-origin images, and causes an immediate image reload (albeit from cache) necessitating the use of a load event listener which subsequently mutates the snapshot.  This change allows us to  avoid the mutation of the snapshot for the same-origin case.

* Modify inlineImages test to remove delay and show that we can inline images without mutation

* Add an explicit test for when the `image.crossOrigin = 'anonymous';` method is necessary.  Uses a combination of about:blank and our test server to simulate a cross-origin context

* Other test changes: there were some spurious rrweb mutations being generated by the addition of the crossorigin attribute that are now elimnated from the rrweb/__snapshots__/integration.test.ts.snap after this PR - this is good
This commit is contained in:
Eoghan Murray
2026-04-01 12:00:00 +08:00
committed by GitHub
parent 083da07212
commit 1b79b5b6c2
8 changed files with 95 additions and 117 deletions
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27
packages/rrweb-snapshot/src/snapshot.ts
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@@ -747,8 +747,9 @@ function serializeElementNode(
canvasCtx = canvasService.getContext('2d');
}
const image = n as HTMLImageElement;
const oldValue = image.crossOrigin;
image.crossOrigin = 'anonymous';
const imageSrc: string =
image.currentSrc || image.getAttribute('src') || '<unknown-src>';
const priorCrossOrigin = image.crossOrigin;
const recordInlineImage = () => {
image.removeEventListener('load', recordInlineImage);
try {
@@ -760,13 +761,23 @@ function serializeElementNode(
dataURLOptions.quality,
);
} catch (err) {
console.warn(
`Cannot inline img src=${image.currentSrc}! Error: ${err as string}`,
);
if (image.crossOrigin !== 'anonymous') {
image.crossOrigin = 'anonymous';
if (image.complete && image.naturalWidth !== 0)
recordInlineImage(); // too early due to image reload
else image.addEventListener('load', recordInlineImage);
return;
} else {
console.warn(
`Cannot inline img src=${imageSrc}! Error: ${err as string}`,
);
}
}
if (image.crossOrigin === 'anonymous') {
priorCrossOrigin
? (attributes.crossOrigin = priorCrossOrigin)
: image.removeAttribute('crossorigin');
}
oldValue
? (attributes.crossOrigin = oldValue)
: image.removeAttribute('crossorigin');
};
// The image content may not have finished loading yet.
if (image.complete && image.naturalWidth !== 0) recordInlineImage();

1
packages/rrweb-snapshot/test/__snapshots__/integration.test.ts.snap
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@@ -338,6 +338,7 @@ exports[`integration tests [html file]: mask-text.html 1`] = `
exports[`integration tests [html file]: picture.html 1`] = `
"<html xmlns=\\"http://www.w3.org/1999/xhtml\\"><head></head><body>
<picture>
<!-- these are 404 - not sure if that's intentional -->
<source type=\\"image/webp\\" srcset=\\"http://localhost:3030/assets/img/characters/robot.webp\\" />
<img src=\\"http://localhost:3030/assets/img/characters/robot.png\\" />
</picture>

1
packages/rrweb-snapshot/test/html/picture.html
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@@ -1,6 +1,7 @@
<html xmlns="http://www.w3.org/1999/xhtml">
<body>
<picture>
<!-- these are 404 - not sure if that's intentional -->
<source type="image/webp" srcset="assets/img/characters/robot.webp" />
<img src="assets/img/characters/robot.png" />
</picture>

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packages/rrweb-snapshot/test/images/rrweb-favicon-20x20.png Normal file
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65
packages/rrweb-snapshot/test/integration.test.ts
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@@ -6,7 +6,7 @@ import * as puppeteer from 'puppeteer';
import * as rollup from 'rollup';
import * as typescript from 'rollup-plugin-typescript2';
import * as assert from 'assert';
import { waitForRAF } from './utils';
import { waitForRAF, getServerURL } from './utils';
const _typescript = typescript as unknown as () => rollup.Plugin;
@@ -209,12 +209,63 @@ iframe.contentDocument.querySelector('center').clientHeight
inlineImages: true,
inlineStylesheet: false
})`);
await waitForRAF(page);
const snapshot = (await page.evaluate(
'JSON.stringify(snapshot, null, 2);',
)) as string;
assert(snapshot.includes('"rr_dataURL"'));
assert(snapshot.includes('data:image/webp;base64,'));
// don't wait, as we want to ensure that the same-origin image can be inlined immediately
const bodyChildren = (await page.evaluate(`
snapshot.childNodes[0].childNodes[1].childNodes.filter((cn) => cn.type === 2);
`)) as any[];
expect(bodyChildren[1]).toEqual(
expect.objectContaining({
tagName: 'img',
attributes: {
src: expect.stringMatching(/images\/robot.png$/),
alt: 'This is a robot',
rr_dataURL: expect.stringMatching(/^data:image\/webp;base64,/),
},
}),
);
});
it('correctly saves cross-origin images offline', async () => {
const page: puppeteer.Page = await browser.newPage();
await page.goto('about:blank', {
waitUntil: 'load',
});
await page.setContent(
`
<html xmlns="http://www.w3.org/1999/xhtml">
<body>
<img src="${getServerURL(
server,
)}/images/rrweb-favicon-20x20.png" alt="CORS restricted but has access-control-allow-origin: *" />
</body>
</html>
`,
{
waitUntil: 'load',
},
);
await page.waitForSelector('img', { timeout: 1000 });
await page.evaluate(`${code}var snapshot = rrweb.snapshot(document, {
dataURLOptions: { type: "image/webp", quality: 0.8 },
inlineImages: true,
inlineStylesheet: false
})`);
await waitForRAF(page); // need a small wait, as after the crossOrigin="anonymous" change, the snapshot triggers a reload of the image (after which, the snapshot is mutated)
const bodyChildren = (await page.evaluate(`
snapshot.childNodes[0].childNodes[1].childNodes.filter((cn) => cn.type === 2);
`)) as any[];
expect(bodyChildren[0]).toEqual(
expect.objectContaining({
tagName: 'img',
attributes: {
src: getServerURL(server) + '/images/rrweb-favicon-20x20.png',
alt: 'CORS restricted but has access-control-allow-origin: *',
rr_dataURL: expect.stringMatching(/^data:image\/webp;base64,/),
},
}),
);
});
it('correctly saves blob:images offline', async () => {

10
packages/rrweb-snapshot/test/utils.ts
View File

@@ -1,4 +1,5 @@
import * as puppeteer from 'puppeteer';
import * as http from 'http';
export async function waitForRAF(page: puppeteer.Page) {
return await page.evaluate(() => {
@@ -9,3 +10,12 @@ export async function waitForRAF(page: puppeteer.Page) {
});
});
}
export function getServerURL(server: http.Server): string {
const address = server.address();
if (address && typeof address !== 'string') {
return `http://localhost:${address.port}`;
} else {
return `${address}`;
}
}