Add Passkeys Support

Closes gh-13305

javascript/test/base64.test.js

@@ -0,0 +1,76 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+"use strict";
+
+import { expect } from "chai";
+import base64url from "../lib/base64url.js";
+
+describe("base64url", () => {
+  before(() => {
+    // Emulate the atob / btoa base64 encoding/decoding from the browser
+    global.window = {
+      btoa: (str) => Buffer.from(str, "binary").toString("base64"),
+      atob: (b64) => Buffer.from(b64, "base64").toString("binary"),
+    };
+  });
+
+  after(() => {
+    // Reset window object
+    global.window = {};
+  });
+
+  it("decodes", () => {
+    // "Zm9vYmFy" is "foobar" in base 64, i.e. f:102 o:111 o:111 b:98 a:97 r:114
+    const decoded = base64url.decode("Zm9vYmFy");
+
+    expect(new Uint8Array(decoded)).to.be.deep.equal(new Uint8Array([102, 111, 111, 98, 97, 114]));
+  });
+
+  it("decodes special characters", () => {
+    // Wrap the decode function for easy testing
+    const decode = (str) => {
+      const decoded = new Uint8Array(base64url.decode(str));
+      return Array.from(decoded);
+    };
+
+    // "Pz8/" is "???" in base64, i.e. ?:63 three times
+    expect(decode("Pz8/")).to.be.deep.equal(decode("Pz8_"));
+    expect(decode("Pz8_")).to.be.deep.equal([63, 63, 63]);
+    // "Pj4+" is ">>>" in base64, ie >:62 three times
+    expect(decode("Pj4+")).to.be.deep.equal(decode("Pj4-"));
+    expect(decode("Pj4-")).to.be.deep.equal([62, 62, 62]);
+  });
+
+  it("encodes", () => {
+    const encoded = base64url.encode(Buffer.from("foobar"));
+
+    expect(encoded).to.be.equal("Zm9vYmFy");
+  });
+
+  it("encodes special +/ characters", () => {
+    const encode = (str) => base64url.encode(Buffer.from(str));
+
+    expect(encode("???")).to.be.equal("Pz8_");
+    expect(encode(">>>")).to.be.equal("Pj4-");
+  });
+
+  it("is stable", () => {
+    const base = "tyRDnKxdj7uWOT5jrchXu54lo6nf3bWOUvMQnGOXk7g";
+
+    expect(base64url.encode(base64url.decode(base))).to.be.equal(base);
+  });
+});