MAESTRO: harden patcher replacements for multi-binary installs

backend/utils/__tests__/clientPatcher.test.js

@@ -0,0 +1,36 @@
+const assert = require('assert');
+const clientPatcher = require('../clientPatcher');
+
+function bytesAreZero(buffer) {
+  for (const byte of buffer) {
+    if (byte !== 0x00) {
+      return false;
+    }
+  }
+  return true;
+}
+
+const directStrategy = clientPatcher.getDomainStrategy('authws.net');
+assert.strictEqual(directStrategy.mode, 'direct');
+assert.strictEqual(directStrategy.mainDomain, 'authws.net');
+assert.strictEqual(directStrategy.subdomainPrefix, '');
+
+const splitStrategy = clientPatcher.getDomainStrategy('auth.sanasol.ws');
+assert.strictEqual(splitStrategy.mode, 'split');
+assert.strictEqual(splitStrategy.subdomainPrefix, 'auth.s');
+assert.strictEqual(splitStrategy.mainDomain, 'anasol.ws');
+
+const oldSubdomain = clientPatcher.stringToLengthPrefixed('https://tools.');
+const newSubdomain = clientPatcher.stringToLengthPrefixed('https://');
+const replaceResult = clientPatcher.replaceBytes(oldSubdomain, oldSubdomain, newSubdomain);
+const padding = replaceResult.buffer.slice(newSubdomain.length, oldSubdomain.length);
+assert.ok(bytesAreZero(padding), 'Expected null padding after shorter replacement');
+
+const oldDomainUtf16 = clientPatcher.stringToUtf16LE('hytale.com');
+const smartResult = clientPatcher.findAndReplaceDomainSmart(oldDomainUtf16, 'hytale.com', 'auth.ws');
+const newDomainUtf16 = clientPatcher.stringToUtf16LE('auth.ws');
+assert.ok(smartResult.buffer.slice(0, newDomainUtf16.length).equals(newDomainUtf16));
+const smartPadding = smartResult.buffer.slice(newDomainUtf16.length, oldDomainUtf16.length);
+assert.ok(bytesAreZero(smartPadding), 'Expected null padding in smart replacement');
+
+console.log('clientPatcher tests passed');