Backport Basilisk internal userscripts

browser/internaluserscripts/bundled-scripts/webauthn-microsoft-shim.user.js

@@ -0,0 +1,80 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+// ==UserScript==
+// @name         WebAuthn Shim for Microsoft
+// @namespace    internal-userscripts
+// @description  Forces WebAuthn capability checks to report unsupported on Microsoft auth domains.
+// @match        https://*.microsoft.com/*
+// @match        https://*.live.com/*
+// @match        https://*.msauth.net/*
+// @match        https://*.visualstudio.com/*
+// @grant        none
+// @run-at       document-start
+// ==/UserScript==
+(function () {
+  "use strict";
+
+  var global = typeof window !== "undefined" ? window : null;
+  if (!global || !global.location) {
+    return;
+  }
+
+  if (global.location.protocol !== "https:") {
+    return;
+  }
+
+  var host = String(global.location.hostname || "").toLowerCase();
+  function matchesDomain(domain) {
+    return host === domain || host.slice(-(domain.length + 1)) === "." + domain;
+  }
+
+  if (
+    !matchesDomain("microsoft.com") &&
+    !matchesDomain("live.com") &&
+    !matchesDomain("msauth.net") &&
+    !matchesDomain("visualstudio.com")
+  ) {
+    return;
+  }
+
+  function installShim() {
+    if (typeof navigator.credentials === "undefined") {
+      var fake = {
+        create: function () {
+          return Promise.reject(
+            new DOMException("WebAuthn not supported", "NotSupportedError"),
+          );
+        },
+        get: function () {
+          return Promise.reject(
+            new DOMException("WebAuthn not supported", "NotSupportedError"),
+          );
+        },
+      };
+
+      try {
+        navigator.credentials = fake;
+      } catch (e) {
+        try {
+          Object.defineProperty(navigator, "credentials", {
+            value: fake,
+          });
+        } catch (e2) {}
+      }
+    }
+
+    if (typeof global.PublicKeyCredential === "undefined") {
+      global.PublicKeyCredential = function () {};
+      global.PublicKeyCredential.isUserVerifyingPlatformAuthenticatorAvailable =
+        function () {
+          return Promise.resolve(false);
+        };
+    }
+  }
+
+  installShim();
+  try {
+    global.__internalUserscriptsWebAuthnMicrosoftShim = true;
+  } catch (e) {}
+})();