fix(package_info_plus): add support for file scheme on web

[alvarobcprado]

Description

Web apps using file scheme cannot retrieve version.json, PackageInfoPlusWebPlugin.versionJsonUrl calls Uri.origin which throws StateError if scheme is not http or https

Checklist

• [X] I read the Contributor Guide and followed the process outlined there for submitting PRs.
• [X] I titled the PR using Conventional Commits.
• [X] I did not modify the CHANGELOG.md nor the plugin version in pubspec.yaml files.
• [X] All existing and new tests are passing.
• [X] The analyzer (flutter analyze) does not report any problems on my PR.

Breaking Change

Does your PR require plugin users to manually update their apps to accommodate your change?

• [ ] Yes, this is a breaking change (please indicate that with a ! in the title as explained in Conventional Commits).
• [X] No, this is not a breaking change.

[miquelbeltran]

Hey! thanks for the contribution.

Do you mean when calling fromPlatform with a file:// scheme, right? e.g. PackageInfo.fromPlatform(baseUrl: 'file://....')

[alvarobcprado]

Yes @miquelbeltran , when calling fromPlatform with a file:// scheme, a Bad state: Origin is only applicable to schemes http and https error is throwed from baseUri._origin inside the PackageInfoPlusWebPlugin.versionJsonUrl method.

   /// Get version.json full url.
  Uri versionJsonUrl(String baseUrl, int cacheBuster) {
    final baseUri = Uri.parse(baseUrl);
    final regExp = RegExp(r'[^/]+\.html.*');
    final String originPath =
        '${baseUri._origin}${baseUri.path.replaceAll(regExp, '')}';

...

extension _UriOrigin on Uri {
  /// Get origin.
  ///
  /// This is different from [Uri.origin] because that has checks to prevent
  /// non-http/https use-cases.
  String get _origin {
    if (isScheme('chrome-extension')) {
      return '$scheme://$host';
    }
    return origin;
  }
}

[miquelbeltran]

Got it! thanks for the clarification