fix(package_info_plus): add support for file scheme on web (#3345)

Co-authored-by: Alvaro Prado <[email protected]>

packages/package_info_plus/package_info_plus/example/integration_test/package_info_plus_web_test.dart

@@ -217,6 +217,25 @@ void main() {
               'chrome-extension://abcdefgh/a/b/c/version.json?cachebuster=1'),
         );
       });
+
+      testWidgets('Get correct versionJsonUrl for file', (tester) async {
+        expect(
+          plugin.versionJsonUrl('file://abcdefgh', 1),
+          Uri.parse('file:///version.json?cachebuster=1'),
+        );
+        expect(
+          plugin.versionJsonUrl('file://abcdefgh/a/b/c', 1),
+          Uri.parse('file:///a/b/c/version.json?cachebuster=1'),
+        );
+        expect(
+          plugin.versionJsonUrl('file://abcdefgh/#my-page', 1),
+          Uri.parse('file:///version.json?cachebuster=1'),
+        );
+        expect(
+          plugin.versionJsonUrl('file://abcdefgh/a/b/c/#my-page', 1),
+          Uri.parse('file:///a/b/c/version.json?cachebuster=1'),
+        );
+      });
     },
   );
 

packages/package_info_plus/package_info_plus/lib/src/package_info_plus_web.dart

@@ -123,6 +123,8 @@ extension _UriOrigin on Uri {
   String get _origin {
     if (isScheme('chrome-extension')) {
       return '$scheme://$host';
+    } else if (isScheme('file')) {
+      return '$scheme://';
     }
     return origin;
   }