44 lines
1.4 KiB
JavaScript
44 lines
1.4 KiB
JavaScript
import test from 'node:test';
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import assert from 'node:assert/strict';
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import { embedWorkflow, extractWorkflow } from '../src/pngMetadata.js';
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const PNG_BASE64 = 'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8/x8AAwMCAO+aF9sAAAAASUVORK5CYII=';
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function makePngBlob() {
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return new Blob([Buffer.from(PNG_BASE64, 'base64')], { type: 'image/png' });
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}
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test('embedWorkflow roundtrips workflow data through an iTXt chunk', async () => {
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const workflow = {
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version: 1,
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nodes: [
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{
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id: '1',
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type: 'custom',
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position: { x: 12, y: 34 },
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data: { className: 'DemoNode', widgetValues: { title: 'naïve café', sigma: 'β' } },
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},
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],
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edges: [],
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};
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const embedded = await embedWorkflow(makePngBlob(), workflow);
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const extracted = await extractWorkflow(embedded);
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const bytes = new Uint8Array(await embedded.arrayBuffer());
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assert.deepEqual(extracted, workflow);
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assert.match(Buffer.from(bytes).toString('latin1'), /iTXt/);
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});
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test('extractWorkflow returns the last workflow chunk when an image is re-saved', async () => {
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const first = { version: 1, name: 'old', nodes: [], edges: [] };
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const second = { version: 1, name: 'new', nodes: [], edges: [] };
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const once = await embedWorkflow(makePngBlob(), first);
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const twice = await embedWorkflow(once, second);
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const extracted = await extractWorkflow(twice);
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assert.deepEqual(extracted, second);
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});
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