checkBundleIdMatch method

String? checkBundleIdMatch(String projectRoot)

Returns a warning message if the Bundle ID in GoogleService-Info.plist does not match PRODUCT_BUNDLE_IDENTIFIER in project.pbxproj, or null if they match or either value cannot be read.

Implementation

String? checkBundleIdMatch(String projectRoot) {
  try {
    // 1. Read BUNDLE_ID from plist.
    final plistContent = File(_googleServicePath).readAsStringSync();
    final doc = XmlDocument.parse(plistContent);
    String? plistBundleId;
    for (final key in doc.findAllElements('key')) {
      if (key.innerText == 'BUNDLE_ID') {
        final next = key.nextElementSibling;
        if (next != null) plistBundleId = next.innerText;
        break;
      }
    }
    if (plistBundleId == null) return null;

    // 2. Read PRODUCT_BUNDLE_IDENTIFIER from pbxproj.
    final pbxprojPath =
        p.join(projectRoot, 'ios', 'Runner.xcodeproj', 'project.pbxproj');
    final pbxContent = File(pbxprojPath).readAsStringSync();
    final pattern = RegExp(r'PRODUCT_BUNDLE_IDENTIFIER = ([^;]+);');
    String? pbxBundleId;
    for (final match in pattern.allMatches(pbxContent)) {
      final value = match.group(1)!.trim();
      if (!value.contains('RunnerTests')) {
        pbxBundleId = value;
        break;
      }
    }
    if (pbxBundleId == null) return null;

    // 3. Compare.
    if (plistBundleId == pbxBundleId) return null;

    return '⚠️  Bundle ID mismatch detected:\n'
        '    GoogleService-Info.plist : $plistBundleId\n'
        '    project.pbxproj          : $pbxBundleId\n'
        '\n'
        '    Your app will likely crash at launch — Firebase cannot initialize\n'
        '    with a mismatched Bundle ID.\n'
        '\n'
        '    To fix, run:\n'
        '      flutter pub add -d change_app_package_name\n'
        '      dart run change_app_package_name:main $plistBundleId --ios\n'
        '\n'
        '    See: https://pub.dev/packages/change_app_package_name\n'
        '\n'
        '    Continue anyway? (y/N): ';
  } catch (_) {
    return null;
  }
}