Bug 1484619 [wpt PR 12566] - Add tests for cross-origin redirects get…

…ting back to the original origin, a=testonly

Automatic update from web-platform-testsAdd tests for cross-origin redirects getting back to the original origin (#12566)

This is discussed at whatwg/fetch#737, but
currently implementors have a somewhat consistent behavior. I will
update the test if we change the behavior.
--

wpt-commits: c5400eeca28ce5b1dd10d442f0c39a6274d8522d
wpt-pr: 12566

UltraBlame original commit: b17979968e272b9e46c009a8cdbba327f0885f0a

testing/web-platform/meta/MANIFEST.json

@@ -351537,6 +351537,16 @@
      {}
     ]
    ],
+   "fetch/api/redirect/redirect-back-to-original-origin.any.js": [
+    [
+     "/fetch/api/redirect/redirect-back-to-original-origin.any.html",
+     {}
+    ],
+    [
+     "/fetch/api/redirect/redirect-back-to-original-origin.any.worker.html",
+     {}
+    ]
+   ],
    "fetch/api/redirect/redirect-count.any.js": [
     [
      "/fetch/api/redirect/redirect-count.any.html",
@@ -586074,6 +586084,10 @@
    "8e23770bd6040425b33d5f0d4eb8cff362544c33",
    "support"
   ],
+  "fetch/api/redirect/redirect-back-to-original-origin.any.js": [
+   "32d413cb2f16db6753bd71cfa0395ff8bd7efea9",
+   "testharness"
+  ],
   "fetch/api/redirect/redirect-count.any.js": [
    "7fa6dd1d0ed5579cc66c16297a61a57cbadd1c74",
    "testharness"

testing/web-platform/tests/fetch/api/redirect/redirect-back-to-original-origin.any.js

@@ -0,0 +1,37 @@
+
+
+const BASE = location.href;
+const IS_HTTPS = new URL(BASE).protocol === 'https:';
+const REMOTE_HOST = get_host_info()['REMOTE_HOST'];
+const REMOTE_PORT =
+  IS_HTTPS ? get_host_info()['HTTPS_PORT'] : get_host_info()['HTTP_PORT'];
+
+const REMOTE_ORIGIN =
+  new URL(`//${REMOTE_HOST}:${REMOTE_PORT}`, BASE).origin;
+const DESTINATION = new URL('../resources/cors-top.txt', BASE);
+
+function CreateURL(url, BASE, params) {
+  const u = new URL(url, BASE);
+  for (const {name, value} of params) {
+    u.searchParams.append(name, value);
+  }
+  return u;
+}
+
+const redirect =
+  CreateURL('/fetch/api/resources/redirect.py', REMOTE_ORIGIN,
+            [{name: 'redirect_status', value: 303},
+             {name: 'location', value: DESTINATION.href}]);
+
+promise_test(async (test) => {
+  const res = await fetch(redirect.href, {mode: 'no-cors'});
+
+  assert_equals(res.type, 'opaque');
+}, 'original => remote => original with mode: "no-cors"');
+
+promise_test(async (test) => {
+  const res = await fetch(redirect.href, {mode: 'cors'});
+  assert_equals(res.type, 'cors');
+}, 'original => remote => original with mode: "cors"');
+
+done();