Rename files

ts/util/Username.dom.ts

@@ -0,0 +1,72 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import * as RemoteConfig from '../RemoteConfig.dom.js';
+import { parseIntWithFallback } from './parseIntWithFallback.std.js';
+
+export function getMaxNickname(): number {
+  return parseIntWithFallback(
+    RemoteConfig.getValue('global.nicknames.max'),
+    32
+  );
+}
+export function getMinNickname(): number {
+  return parseIntWithFallback(RemoteConfig.getValue('global.nicknames.min'), 3);
+}
+
+// Usernames have a minimum length of 3 and maximum of 32
+const USERNAME_CHARS = /^@?[a-zA-Z_][a-zA-Z0-9_]{2,31}(.\d+)?$/;
+const ALL_DIGITS = /^\d+$/;
+
+export function getUsernameFromSearch(searchTerm: string): string | undefined {
+  let modifiedTerm = searchTerm.trim();
+
+  if (ALL_DIGITS.test(modifiedTerm)) {
+    return undefined;
+  }
+
+  if (modifiedTerm.startsWith('@')) {
+    modifiedTerm = modifiedTerm.slice(1);
+  }
+  if (modifiedTerm.endsWith('.')) {
+    // Allow nicknames without full discriminator
+    modifiedTerm = `${modifiedTerm}01`;
+  } else if (/\.\d$/.test(modifiedTerm)) {
+    // Add one more digit if they only have one
+    modifiedTerm = `${modifiedTerm}1`;
+  } else if (!/\.\d*$/.test(modifiedTerm)) {
+    // Allow nicknames without discriminator
+    modifiedTerm = `${modifiedTerm}.01`;
+  }
+
+  if (!USERNAME_CHARS.test(modifiedTerm)) {
+    return undefined;
+  }
+
+  try {
+    return modifiedTerm;
+  } catch {
+    return undefined;
+  }
+}
+
+export function isProbablyAUsername(text: string): boolean {
+  const searchTerm = text.trim();
+
+  if (searchTerm.startsWith('@')) {
+    return true;
+  }
+
+  if (!USERNAME_CHARS.test(searchTerm)) {
+    return false;
+  }
+  if (ALL_DIGITS.test(searchTerm)) {
+    return false;
+  }
+
+  if (/.+\.\d\d\d?$/.test(searchTerm)) {
+    return true;
+  }
+
+  return false;
+}