duckduckgo · SlayterDev · Feb 13, 2024 · Jan 15, 2024
@@ -76,6 +76,7 @@ <h2>Privacy Protections Tests</h2>
 	<li><a href='./privacy-protections/surrogates/'>Surrogates</a></li>
 	<li><a href='./privacy-protections/gpc/'>Global Privacy Control</a></li>
 	<li><a href='./privacy-protections/amp/'>AMP Links</a></li>
+	<li><a href='./privacy-protections/amp-loop-protection/'>AMP Loop Protection</a></li>
 	<li><a href='./privacy-protections/query-parameters/'>Query Parameters</a></li>
 	<li><a href='./content-scope-scripts/runtime-checks/'>Runtime checks</a></li>
 </ul>

@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>AMP loop protection</title>
+</head>
+<body>
+    <h1 id="param-display"></h1>
+    <script>
+        const MAX = 15;
+        const LS_ITEM_KEY = 'amp-loop-protection-attempt';
+        const newUrl = new URL(location.href);
+        const isStart = newUrl.searchParams.has('start');
+
+        if (isStart) {
+            localStorage[LS_ITEM_KEY] = 0;
+        }
+        const attempt = Number.parseInt(localStorage[LS_ITEM_KEY], 10) || 0;
+        localStorage[LS_ITEM_KEY] = attempt + 1;
+
+        document.getElementById('param-display').innerText = `${newUrl.searchParams}`;
+        document.body.innerHTML += `<p>Attempt ${attempt + 1}/${MAX}</p>`;
+
+        // set amp attr, count attempts
+        const params = new URLSearchParams(location.search);
+        if (params.get('amp') === '1') {
+            document.documentElement.setAttribute('amp', '');
+            const link = document.createElement('link');
+            link.setAttribute('rel', 'canonical');
+            const ampUrl = new URL('http://good.third-party.site/privacy-protections/amp-loop-protection/amp-only.html');
+            if (isStart) {
+                ampUrl.searchParams.set('start', '1');
+            }
+            link.setAttribute('href', ampUrl.href);
+            document.head.appendChild(link);
+
+            localStorage.removeItem(LS_ITEM_KEY);
+            const onMessage = msg => {
+                if (msg.data.action && msg.data.action === 'url') {
+                    if (window.opener) {
+                        window.opener.postMessage({ url: document.location.href, type: msg.data.type }, '*');
+                    } else if (window.parent) {
+                        window.parent.postMessage({ url: document.location.href, type: msg.data.type }, '*');
+                    }
+                }
+            };
+
+            window.addEventListener('message', onMessage);
+        } else if (attempt < MAX) {
+            newUrl.searchParams.set('amp', 1);
+            newUrl.pathname = newUrl.pathname
+            location.href = newUrl.href;
+        }
+    </script>
+</body>
+</html>
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>AMP loop protection</title>
+
+    <script src='./main.js' defer></script>
+    <link href='./style.css' rel='stylesheet'></link>
+</head>
+<body>
+    <p><a href="../../">[Home]</a> ↣ <a href="../">[Privacy Protections Tests]</a> ↣ <strong>[AMP Upgrade Loop Protection]</strong></p>
+
+    <p>This test will navigate to a non-AMP page that immediately redirects to its AMP version. This will cause a non-AMP↔AMP loop (client trying to get real page, page redirecting). Clients should detect this scenario and allow the AMP page to load.</p>
+    <p>If the loop protection works the reported url will have the amp=1 parameter.</p>
+
+    <p><button id='start'>Start test</button></p>
+
+    <details id='tests' hidden>
+        <summary id='tests-summary'></summary>
+        <ul id='tests-details'>
+        </ul>
+    </details>
+
+    <p><button id='download' disabled>Download the result</button></p>
+
+</body>
+</html>
@@ -0,0 +1,142 @@
+const startButton = document.querySelector('#start');
+const downloadButton = document.querySelector('#download');
+
+const testsDiv = document.querySelector('#tests');
+const testsSummaryDiv = document.querySelector('#tests-summary');
+const testsDetailsDiv = document.querySelector('#tests-details');
+
+const TEST_DOMAIN = 'good.third-party.site';
+
+const tests = [
+    {
+        id: 'rewrite-amp',
+        run: () => {
+            let res;
+            const promise = new Promise((resolve, reject) => { res = resolve; });
+            const otherWindow = window.open(`http://${TEST_DOMAIN}/privacy-protections/amp-loop-protection/amp-only.html?amp=1&start`);
+
+            const interval = setInterval(() => {
+                otherWindow.postMessage({ action: 'url', type: 'navigation' }, `http://${TEST_DOMAIN}/`);
+            }, 500);
+
+            function onMessage (m) {
+                if (m.data && m.data.type === 'navigation') {
+                    clearInterval(interval);
+                    otherWindow.close();
+                    window.removeEventListener('message', onMessage);
+                    console.log('navigation', m.data.url);
+                    res(m.data.url);
+                }
+            }
+
+            window.addEventListener('message', onMessage);
+
+            return promise;
+        }
+    }
+];
+
+// object that contains results of all tests
+const results = {
+    page: 'amp-loop-protection',
+    date: null,
+    results: []
+};
+
+function resultToHTML (data) {
+    if (Array.isArray(data)) {
+        return `<ul>${data.map(r => `<li>${r.test} - ${r.result}</li>`).join('')}</ul>`;
+    } else if (data) {
+        return JSON.stringify(data, null, 2);
+    }
+
+    return null;
+}
+
+/**
+ * Test runner
+ */
+function runTests () {
+    startButton.setAttribute('disabled', 'disabled');
+    downloadButton.removeAttribute('disabled');
+    testsDiv.removeAttribute('hidden');
+
+    results.results.length = 0;
+    results.date = (new Date()).toUTCString();
+    let all = 0;
+    let failed = 0;
+
+    testsDetailsDiv.innerHTML = '';
+
+    function updateSummary () {
+        testsSummaryDiv.innerText = `Performed ${all} tests${failed > 0 ? ` (${failed} failed)` : ''}. Click for details.`;
+    }
+
+    for (const test of tests) {
+        const resultObj = {
+            id: test.id,
+            value: null
+        };
+        results.results.push(resultObj);
+
+        const li = document.createElement('li');
+        li.id = `test-${test.id.replace(' ', '-')}`;
+        li.innerHTML = `${test.id} - <span class='value'>…</span>`;
+        const valueSpan = li.querySelector('.value');
+
+        testsDetailsDiv.appendChild(li);
+
+        try {
+            const result = test.run();
+
+            if (result instanceof Promise) {
+                result
+                    .then(data => {
+                        valueSpan.textContent = resultToHTML(data);
+                        resultObj.value = data || null;
+                    })
+                    .catch(e => {
+                        failed++;
+                        valueSpan.innerHTML = `❌ error thrown ("${e.message ? e.message : e}")`;
+                        updateSummary();
+                    });
+            } else {
+                valueSpan.innerHTML = resultToHTML(result);
+                resultObj.value = result || null;
+            }
+        } catch (e) {
+            failed++;
+            valueSpan.innerHTML = `❌ error thrown ("${e.message ? e.message : e}")`;
+        }
+
+        all++;
+    }
+
+    updateSummary();
+
+    startButton.removeAttribute('disabled');
+}
+
+function downloadTheResults () {
+    const data = JSON.stringify(results, null, 2);
+    const a = document.createElement('a');
+    const url = window.URL.createObjectURL(new Blob([data], { type: 'application/json' }));
+    a.href = url;
+    a.download = 'amp-loop-protection-results.json';
+
+    document.body.appendChild(a);
+    a.click();
+
+    window.URL.revokeObjectURL(url);
+    a.remove();
+}
+
+downloadButton.addEventListener('click', () => downloadTheResults());
+
+// run tests if button was clicked or…
+startButton.addEventListener('click', () => runTests());
+
+// if url query is '?run' start tests imadiatelly
+if (document.location.search === '?run') {
+    runTests();
+}
@@ -0,0 +1,7 @@
+* {
+    box-sizing: border-box;
+}
+
+.value {
+    color: gray;
+}
@@ -24,6 +24,7 @@ <h1>Privacy Protections Tests</h1>
         <li><a href='./surrogates/'>Surrogates</a></li>
         <li><a href='./gpc/'>Global Privacy Control</a></li>
         <li><a href='./amp/'>AMP Links</a></li>
+        <li><a href='./amp-loop-protection/'>AMP Loop Protection</a></li>
         <li><a href='./query-parameters/'>Query Parameters</a></li>
     </ul>