https://www.cdc.gov/TemplatePackage/contrib/libs/cdc/c2r/c2r.js?_=28275

1import { createC2pa } from '/TemplatePackage/contrib/libs/c2pa/latest/c2pa.esm.min.js';
2
3(async () => {
4	const c2pa = await createC2pa({
5		wasmSrc: '/TemplatePackage/contrib/libs/c2pa/latest/toolkit_bg.wasm',
6		workerSrc: '/TemplatePackage/contrib/libs/c2pa/latest/c2pa.worker.min.js',
7	});
8
9	const DEBUG = !!window.location?.search?.includes('cdcdebug');
10	const manifests = {};
11
12	// expose as recallable method
13	window.cdcc2paCheck = () => {
14		Array.from(document.getElementsByTagName('img')).forEach(async (image) => {
15			// skip images in page headers, footers, or non-indexed content, or images already checked
16			if (image?.closest('header, footer, .noindex, #hero-carousel')) {
17				return;
18			}
19			// skip some extensions
20			if (!image.src || image.src.match(/\.(svg|axd|gif|bmp)([#\?]|$)/i)) {
21				return;
22			}
23
24			let manifestStore = null;
25			if (manifests.hasOwnProperty(image.src)) {
26				manifestStore = manifests[image.src];
27			} else {
28				// Get a manifest store for the image
29				try {
30					let manifest = await c2pa.read(image);
31					manifestStore = manifest.manifestStore;
32				} catch (e) {
33					DEBUG && console.error(`C2R: failed checking image:`, image, e);
34					return;
35				}
36				manifests[image.src] = manifestStore
37			}
38			const manifestFlat = JSON.stringify(manifestStore?.activeManifest?.assertions?.data || {});
39			const manifestCheck = manifestFlat.includes('cv.iptc.org/newscodes/digitalsourcetype/compositeWithTrainedAlgorithmicMedia') ||
40				manifestFlat.includes('cv.iptc.org/newscodes/digitalsourcetype/trainedAlgorithmicMedia');
41
42			DEBUG && console.info(`C2R: ${manifestCheck?'Y':'n'}`, image, manifestStore);
43			if (manifestStore && manifestCheck) {
44				const details = {
45					generator: String(manifestStore.activeManifest?.claimGenerator || ''),
46					tools: [],
47					issuer: '',
48					date: '',
49				};
50				if (Array.isArray(manifestStore.activeManifest?.assertions?.data)) {
51					manifestStore.activeManifest.assertions.data.forEach((assertion) => {
52						let assertionData = assertion?.data;
53						if (assertionData) {
54							assertionData.actions.forEach((action) => {
55								if (action.digitalSourceType.includes('cv.iptc.org/newscodes/digitalsourcetype/compositeWithTrainedAlgorithmicMedia') ||
56									action.digitalSourceType.includes('cv.iptc.org/newscodes/digitalsourcetype/trainedAlgorithmicMedia')) {
57									details.tools.push(action?.softwareAgent);
58								}
59							});
60						}
61					});
62				}
63				details.issuer = String(manifestStore.activeManifest?.signatureInfo?.issuer || '');
64				details.date   = String(manifestStore.activeManifest?.signatureInfo?.time || '');
65				// dispatch event and flag to avoid retriggering
66				image.dispatchEvent(new CustomEvent('cdc-image-c2r', { detail: details, bubbles: true }));
67			}
68		});
69	}
70	if (document.readyState === 'loading') {
71		document.addEventListener('DOMContentLoaded', window.cdcc2paCheck);
72	} else {
73		window.cdcc2paCheck();
74	}
75})();