Using string for files

Author: martijn00

lib/src/form_builder_validators.dart

@@ -1,5 +1,3 @@
-import 'dart:io';
-
 import 'package:flutter/material.dart';
 import '../form_builder_validators.dart';
 
@@ -445,31 +443,31 @@ class FormBuilderValidators {
           : null;
 
   /// [FormFieldValidator] that requires the field's value to be a valid file extension.
-  static FormFieldValidator<File> fileExtension({
+  static FormFieldValidator<String> fileExtension({
     required List<String> allowedExtensions,
     String? errorText,
   }) =>
-      (File? valueCandidate) => valueCandidate == null
+      (valueCandidate) => valueCandidate == null
           ? null
-          : !allowedExtensions.contains(
-                  fileExtensionFromPath(valueCandidate.path).toLowerCase())
+          : !allowedExtensions
+                  .contains(fileExtensionFromPath(valueCandidate).toLowerCase())
               ? errorText ??
                   FormBuilderLocalizations.current
                       .fileExtensionErrorText(allowedExtensions.join(', '))
               : null;
 
   /// [FormFieldValidator] that restricts the size of an file to be less than or equal to the provided maximum size.
   /// * [maxSize] is the maximum size in bytes.
-  static FormFieldValidator<File> fileSize({
+  static FormFieldValidator<String> fileSize({
     required int maxSize,
     String? errorText,
   }) =>
-      (File? valueCandidate) => valueCandidate == null
+      (valueCandidate) => valueCandidate == null
           ? null
-          : valueCandidate.existsSync() && valueCandidate.lengthSync() > maxSize
+          : int.parse(valueCandidate) > maxSize
               ? errorText ??
                   FormBuilderLocalizations.current.fileSizeErrorText(
-                    formatBytes(valueCandidate.lengthSync()),
+                    formatBytes(int.parse(valueCandidate)),
                     formatBytes(maxSize),
                   )
               : null;

test/form_builder_validators_test.dart

@@ -592,9 +592,9 @@ void main() {
         allowedExtensions: ['txt', 'pdf'],
       );
       // Pass
-      expect(validator(File('test.txt')), isNull);
+      expect(validator(File('test.txt').path), isNull);
       // Fail
-      expect(validator(File('test.doc')), isNotNull);
+      expect(validator(File('test.doc').path), isNotNull);
     }),
   );
 
@@ -607,10 +607,10 @@ void main() {
         ..createSync()
         ..writeAsBytesSync(List.filled(512, 0));
       // Pass
-      expect(validator(file), isNull);
+      expect(validator(file.lengthSync().toString()), isNull);
       // Fail
       file.writeAsBytesSync(List.filled(2048, 0));
-      expect(validator(file), isNotNull);
+      expect(validator(file.lengthSync().toString()), isNotNull);
       // Cleanup
       file.deleteSync();
     }),