feat(utils): add urlToOnion util

packages/utils/src/index.ts

@@ -29,6 +29,7 @@ export * from './scheduleAction';
 export * from './throwError';
 export * from './truncateMiddle';
 export * from './topologicalSort';
+export * from './urlToOnion';
 export * as versionUtils from './versionUtils';
 export * as xssFilters from './xssFilters';
 export * from './getLocaleSeparators';

packages/utils/src/urlToOnion.ts

@@ -0,0 +1,16 @@
+/**
+ * Tries to replace clearnet domain name in given `url` by any of the onion domain names in
+ * `onionDomains` map and return it. When no onion replacement is found, returns `undefined`.
+ */
+export const urlToOnion = (url: string, onionDomains: { [domain: string]: string }) => {
+    const [, protocol, subdomain, domain, rest] =
+        url.match(/^(http|ws)s?:\/\/([^:/]+\.)?([^/.]+\.[^/.]+)(\/.*)?$/i) ?? [];
+    // ^(http|ws)s?:\/\/ - required http(s)/ws(s) protocol
+    // ([^:/]+\.)? - optional subdomains, e.g. 'blog.'
+    // ([^/.]+\.[^/.]+) - required two-part domain name, e.g. 'trezor.io'
+    // (\/.*)?$ - optional path and/or query, e.g. '/api/data?id=1234'
+
+    if (!domain || !onionDomains[domain]) return;
+
+    return `${protocol}://${subdomain ?? ''}${onionDomains[domain]}${rest ?? ''}`;
+};

packages/utils/tests/urlToOnion.test.ts

@@ -0,0 +1,28 @@
+import { urlToOnion } from '../src/urlToOnion';
+
+const DICT = {
+    'trezor.io': 'trezorioabcd.onion',
+    'coingecko.com': 'coingeckoabcd.onion',
+};
+
+const FIXTURE = [
+    ['invalid domain', 'aaaa', undefined],
+    ['unknown domain', 'http://www.something.test', undefined],
+    ['missing protocol', 'trezor.io', undefined],
+    ['simple domain http', 'https://trezor.io/', `http://trezorioabcd.onion/`],
+    ['simple domain https', 'https://trezor.io/', `http://trezorioabcd.onion/`],
+    ['subdomain', 'https://cdn.trezor.io/x/1*ab.png', `http://cdn.trezorioabcd.onion/x/1*ab.png`],
+    ['subsubdomain', 'http://alpha.beta.trezor.io', `http://alpha.beta.trezorioabcd.onion`],
+    ['blockbook', 'https://btc1.trezor.io/api?t=13#a', `http://btc1.trezorioabcd.onion/api?t=13#a`],
+    ['coingecko', 'https://coingecko.com/?dt=5-1-2021', `http://coingeckoabcd.onion/?dt=5-1-2021`],
+    ['websocket wss', 'wss://trezor.io', 'ws://trezorioabcd.onion'],
+    ['websocket ws', 'ws://foo.bar.trezor.io/?foo=bar', 'ws://foo.bar.trezorioabcd.onion/?foo=bar'],
+    ['duplicate match', 'http://trezor.io/trezor.io', 'http://trezorioabcd.onion/trezor.io'],
+    ['false match', 'http://a.test/b?url=trezor.io', undefined],
+] as [string, string, string | undefined][];
+
+describe('urlToOnion', () => {
+    FIXTURE.forEach(([desc, clear, onion]) =>
+        it(desc, () => expect(urlToOnion(clear, DICT)).toBe(onion)),
+    );
+});