feat(share_plus): share XFile created using File.fromData() (#1284)

Co-authored-by: Miguel Beltran <m@beltran.work>

packages/share_plus/share_plus/example/integration_test/share_plus_test.dart

@@ -6,6 +6,8 @@
 
 import 'dart:io';
 
+import 'package:file_selector/file_selector.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:share_plus/share_plus.dart';
 import 'package:integration_test/integration_test.dart';
@@ -24,4 +26,13 @@ void main() {
   testWidgets('Can launch shareWithResult', (WidgetTester tester) async {
     expect(Share.shareWithResult('message', subject: 'title'), isNotNull);
   });
+
+  testWidgets('Can shareXFile created using File.fromData()',
+      (WidgetTester tester) async {
+    final bytes = Uint8List.fromList([1, 2, 3, 4, 5, 6, 7, 8]);
+    final XFile file =
+        XFile.fromData(bytes, name: 'image.jpg', mimeType: 'image/jpeg');
+
+    expect(Share.shareXFiles([file], text: "example"), isNotNull);
+  });
 }

packages/share_plus/share_plus/example/lib/main.dart

@@ -8,6 +8,7 @@ import 'dart:io';
 
 import 'package:file_selector/file_selector.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:image_picker/image_picker.dart';
 import 'package:share_plus/share_plus.dart';
 
@@ -123,6 +124,17 @@ class DemoAppState extends State<DemoApp> {
                       );
                     },
                   ),
+                  const Padding(padding: EdgeInsets.only(top: 12.0)),
+                  Builder(
+                    builder: (BuildContext context) {
+                      return ElevatedButton(
+                        onPressed: () {
+                          _onShareXFileFromAssets(context);
+                        },
+                        child: const Text('Share XFile from Assets'),
+                      );
+                    },
+                  ),
                 ],
               ),
             ),
@@ -185,4 +197,24 @@ class DemoAppState extends State<DemoApp> {
       content: Text("Share result: ${result.status}"),
     ));
   }
+
+  void _onShareXFileFromAssets(BuildContext context) async {
+    final box = context.findRenderObject() as RenderBox?;
+    final scaffoldMessenger = ScaffoldMessenger.of(context);
+    final data = await rootBundle.load('assets/flutter_logo.png');
+    final buffer = data.buffer;
+    final result = await Share.shareXFiles(
+      [
+        XFile.fromData(
+            buffer.asUint8List(data.offsetInBytes, data.lengthInBytes),
+            name: 'flutter_logo.png',
+            mimeType: 'image/png'),
+      ],
+      sharePositionOrigin: box!.localToGlobal(Offset.zero) & box.size,
+    );
+
+    scaffoldMessenger.showSnackBar(SnackBar(
+      content: Text("Share result: ${result.status}"),
+    ));
+  }
 }

packages/share_plus/share_plus/example/pubspec.yaml

@@ -25,5 +25,8 @@ dev_dependencies:
 flutter:
   uses-material-design: true
 
+  assets:
+    - assets/flutter_logo.png
+
 environment:
   sdk: '>=2.12.0 <3.0.0'

packages/share_plus/share_plus_platform_interface/lib/method_channel/method_channel_share.dart

@@ -3,15 +3,19 @@
 // found in the LICENSE file.
 
 import 'dart:async';
+import 'dart:io';
+
 // Keep dart:ui for retrocompatiblity with Flutter <3.3.0
 // ignore: unnecessary_import
 import 'dart:ui';
 
 import 'package:cross_file/cross_file.dart';
 import 'package:flutter/services.dart';
 import 'package:meta/meta.dart' show visibleForTesting;
-import 'package:mime/mime.dart' show lookupMimeType;
+import 'package:mime/mime.dart' show extensionFromMime, lookupMimeType;
 import 'package:share_plus_platform_interface/share_plus_platform_interface.dart';
+import 'package:path_provider/path_provider.dart';
+import 'package:uuid/uuid.dart';
 
 /// Plugin for summoning a platform share sheet.
 class MethodChannelShare extends SharePlatform {
@@ -141,19 +145,58 @@ class MethodChannelShare extends SharePlatform {
     String? subject,
     String? text,
     Rect? sharePositionOrigin,
-  }) {
-    final mimeTypes =
-        files.map((e) => e.mimeType ?? _mimeTypeForPath(e.path)).toList();
+  }) async {
+    final filesWithPath = await _getFiles(files);
+
+    final mimeTypes = filesWithPath
+        .map((e) => e.mimeType ?? _mimeTypeForPath(e.path))
+        .toList();
 
     return shareFilesWithResult(
-      files.map((e) => e.path).toList(),
+      filesWithPath.map((e) => e.path).toList(),
       mimeTypes: mimeTypes,
       subject: subject,
       text: text,
       sharePositionOrigin: sharePositionOrigin,
     );
   }
 
+  /// if file doesn't contain path
+  /// then make new file in TemporaryDirectory and return with path
+  ///
+  /// the system will automatically delete files in this
+  /// TemporaryDirectory as disk space is needed elsewhere on the device
+  Future<List<XFile>> _getFiles(List<XFile> files) async {
+    if (files.any((element) => element.path.isEmpty)) {
+      final newFiles = <XFile>[];
+
+      final String tempPath = (await getTemporaryDirectory()).path;
+
+      const uuid = Uuid();
+      for (final XFile element in files) {
+        if (element.path.isEmpty) {
+          final name = uuid.v4();
+
+          final extension =
+              extensionFromMime(element.mimeType ?? 'octet-stream');
+
+          final path = '$tempPath/$name.$extension';
+          final file = File(path);
+
+          await file.writeAsBytes(await element.readAsBytes());
+
+          newFiles.add(XFile(path));
+        } else {
+          newFiles.add(element);
+        }
+      }
+
+      return newFiles;
+    } else {
+      return files;
+    }
+  }
+
   static String _mimeTypeForPath(String path) {
     return lookupMimeType(path) ?? 'application/octet-stream';
   }

packages/share_plus/share_plus_platform_interface/pubspec.yaml

@@ -11,6 +11,8 @@ dependencies:
   meta: ^1.7.0
   mime: ^1.0.2
   plugin_platform_interface: ^2.0.0
+  path_provider: ^2.0.11
+  uuid: ^3.0.6
 
 dev_dependencies:
   flutter_test:

packages/share_plus/share_plus_platform_interface/test/share_plus_platform_interface_test.dart

@@ -163,10 +163,7 @@ void main() {
       () => SharePlatform.instance.shareFilesWithResult(['']),
       throwsA(const TypeMatcher<AssertionError>()),
     );
-    expect(
-      () => sharePlatform.shareXFiles([XFile('')]),
-      throwsA(const TypeMatcher<AssertionError>()),
-    );
+
     verifyZeroInteractions(mockChannel);
   });