Update libsignal to v0.59.0, add support for mock server test with libsignal

Co-authored-by: trevor-signal <trevor@signal.org>
Co-authored-by: Fedor Indutny <indutny@signal.org>

ts/util/getMockServerPort.ts

@@ -0,0 +1,9 @@
+// Copyright 2024 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+export function getMockServerPort(
+  serverUrl = window.SignalContext.config.serverUrl
+): string {
+  const url = new URL(serverUrl);
+  return url.port;
+}

ts/util/isMockServer.ts

@@ -0,0 +1,18 @@
+// Copyright 2024 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+export function isMockServer(
+  serverUrl = window.SignalContext.config.serverUrl
+): boolean {
+  try {
+    const url = new URL(serverUrl);
+
+    return (
+      url.hostname === 'localhost' ||
+      url.hostname === '127.0.0.1' ||
+      url.hostname === '[::1]' // IPv6 loopback address
+    );
+  } catch (e) {
+    return false;
+  }
+}

ts/util/pemToDer.ts

@@ -0,0 +1,11 @@
+// Copyright 2024 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+export function pemToDer(pem: string): Buffer {
+  const pemContent = pem
+    .replace(/-----BEGIN [^-]+-----/, '')
+    .replace(/-----END [^-]+-----/, '')
+    .replace(/\s+/g, '');
+  const derBuffer = Buffer.from(pemContent, 'base64');
+  return derBuffer;
+}