Support for joining New Groups via invite links

ts/test-both/util/webSafeBase64_test.ts

@@ -0,0 +1,85 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+
+import { toWebSafeBase64, fromWebSafeBase64 } from '../../util/webSafeBase64';
+
+describe('both/util/webSafeBase64', () => {
+  it('roundtrips with all elements', () => {
+    const base64 = 'X0KjoAj3h7Tu9YjJ++PamFc4kAg//D4FKommANpP41I=';
+
+    const webSafe = toWebSafeBase64(base64);
+    const actual = fromWebSafeBase64(webSafe);
+
+    assert.strictEqual(base64, actual);
+  });
+
+  describe('#toWebSafeBase64', () => {
+    it('replaces +', () => {
+      const base64 = 'X++y';
+      const expected = 'X--y';
+      const actual = toWebSafeBase64(base64);
+
+      assert.strictEqual(expected, actual);
+    });
+
+    it('replaces /', () => {
+      const base64 = 'X//y';
+      const expected = 'X__y';
+      const actual = toWebSafeBase64(base64);
+
+      assert.strictEqual(expected, actual);
+    });
+
+    it('removes =', () => {
+      const base64 = 'X===';
+      const expected = 'X';
+      const actual = toWebSafeBase64(base64);
+
+      assert.strictEqual(expected, actual);
+    });
+  });
+
+  describe('#fromWebSafeBase64', () => {
+    it('replaces -', () => {
+      const webSafeBase64 = 'X--y';
+      const expected = 'X++y';
+      const actual = fromWebSafeBase64(webSafeBase64);
+
+      assert.strictEqual(expected, actual);
+    });
+
+    it('replaces _', () => {
+      const webSafeBase64 = 'X__y';
+      const expected = 'X//y';
+      const actual = fromWebSafeBase64(webSafeBase64);
+
+      assert.strictEqual(expected, actual);
+    });
+
+    it('adds ===', () => {
+      const webSafeBase64 = 'X';
+      const expected = 'X===';
+      const actual = fromWebSafeBase64(webSafeBase64);
+
+      assert.strictEqual(expected, actual);
+    });
+
+    it('adds ==', () => {
+      const webSafeBase64 = 'Xy';
+      const expected = 'Xy==';
+      const actual = fromWebSafeBase64(webSafeBase64);
+
+      assert.strictEqual(expected, actual);
+    });
+
+    it('adds =', () => {
+      const webSafeBase64 = 'XyZ';
+      const expected = 'XyZ=';
+      const actual = fromWebSafeBase64(webSafeBase64);
+
+      assert.strictEqual(expected, actual);
+    });
+  });
+});