85 lines
2.6 KiB
JavaScript
85 lines
2.6 KiB
JavaScript
setup(_ => {
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assert_implements_optional(
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document.createElement('link').relList.supports('prefetch'),
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"Browser supports prefetch.");
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assert_implements_optional(
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"PerformanceResourceTiming" in window,
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"Browser supports performance APIs.");
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});
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function assert_resource_not_downloaded(test, url) {
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// CSP failures generate resource timing entries, so let's make sure that
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// download sizes are 0.
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const entries = performance.getEntriesByName(url, 'resource');
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for (const entry of entries) {
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assert_equals(entry.transferSize, 0, 'transferSize');
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assert_equals(entry.encodedBodySize, 0, 'encodedBodySize');
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assert_equals(entry.decodedBodySize, 0, 'decodedBodySize');
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}
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}
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function assert_link_prefetches(test, link) {
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assert_no_csp_event_for_url(test, link.href);
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link.onerror = test.unreached_func('onerror should not fire.');
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// Test is finished when either the `load` event fires, or we get a performance
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// entry showing that the resource loaded successfully.
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link.onload = test.step_func(test.step_func_done());
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waitUntilResourceDownloaded(link.href).then(test.step_func_done());
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document.head.appendChild(link);
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}
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function assert_link_does_not_prefetch(test, link) {
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let cspEvent = false;
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let errorEvent = false;
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waitUntilCSPEventForURL(test, link.href)
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.then(test.step_func(e => {
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cspEvent = true;
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assert_equals(e.violatedDirective, "prefetch-src");
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assert_equals(e.effectiveDirective, "prefetch-src");
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if (errorEvent)
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test.done();
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}));
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link.onerror = test.step_func(e => {
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errorEvent = true;
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if (cspEvent)
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test.done();
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});
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link.onload = test.unreached_func('onload should not fire.');
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document.head.appendChild(link);
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}
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async function try_to_prefetch(href, test) {
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const url = new URL(href, location.href);
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url.searchParams.set(
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'pipe',
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'|header(Cache-Control, max-age=604800)' +
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'|header(Access-Control-Allow-Origin, *)' +
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'|header(Timing-Allow-Origin, *)');
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url.searchParams.set('uuid', token());
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const link = document.createElement('link');
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link.rel = 'prefetch';
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link.href = url.toString();
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link.crossOrigin = 'anonymous';
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test.add_cleanup(() => link.remove());
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const didPrefetch = new Promise(resolve => {
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const observer = new PerformanceObserver(list => {
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const entries = list.getEntriesByName(link.href);
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if (entries.length) {
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resolve(entries[0]);
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}
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});
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observer.observe({entryTypes: ['resource']})
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});
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document.head.appendChild(link);
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const entry = await didPrefetch;
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return entry.requestStart > 0 && entry.decodedBodySize > 0;
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}
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