[desktop_drop] feat: implement handler for unsupported URI scheme

packages/desktop_drop/example/lib/main.dart

@@ -1,8 +1,14 @@
+import 'dart:io';
+
 import 'package:desktop_drop/desktop_drop.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:cross_file/cross_file.dart';
+import 'package:http/http.dart';
+import 'package:path_provider/path_provider.dart';
 
 void main() {
+  DesktopDropPlugin.onUnsupportedUriHandler = customHttpsHandler;
   runApp(const MyApp());
 }
 
@@ -105,3 +111,22 @@ class _ExampleDragTargetState extends State<ExampleDragTarget> {
     );
   }
 }
+
+Future<String?> customHttpsHandler(String url) async {
+  if (kIsWeb) return null;
+  final uri = Uri.tryParse(url);
+  if (uri == null) return null;
+
+  if (!['http', 'https'].contains(uri.scheme)) return null;
+
+  final response = await get(uri);
+
+  final tmp =
+      (await getDownloadsDirectory() ?? await getApplicationCacheDirectory());
+  await tmp.create(recursive: true);
+  final file =
+      File(tmp.path + '/desktop_drop_example/' + uri.path.split('/').last);
+  await file.create(recursive: true);
+  await file.writeAsBytes(response.bodyBytes);
+  return file.path;
+}

packages/desktop_drop/example/macos/Flutter/GeneratedPluginRegistrant.swift

@@ -6,7 +6,9 @@ import FlutterMacOS
 import Foundation
 
 import desktop_drop
+import path_provider_foundation
 
 func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   DesktopDropPlugin.register(with: registry.registrar(forPlugin: "DesktopDropPlugin"))
+  PathProviderPlugin.register(with: registry.registrar(forPlugin: "PathProviderPlugin"))
 }

packages/desktop_drop/example/pubspec.lock

@@ -72,6 +72,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.3.1"
+  ffi:
+    dependency: transitive
+    description:
+      name: ffi
+      sha256: "7bf0adc28a23d395f19f3f1eb21dd7cfd1dd9f8e1c50051c069122e6853bc878"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.0"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -95,6 +103,22 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  http:
+    dependency: "direct main"
+    description:
+      name: http
+      sha256: "759d1a329847dd0f39226c688d3e06a6b8679668e350e2891a6474f8b4bb8525"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.0"
+  http_parser:
+    dependency: transitive
+    description:
+      name: http_parser
+      sha256: "2aa08ce0341cc9b354a498388e30986515406668dbcc4f7c950c3e715496693b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.0.2"
   js:
     dependency: transitive
     description:
@@ -143,6 +167,70 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.8.3"
+  path_provider:
+    dependency: "direct main"
+    description:
+      name: path_provider
+      sha256: "909b84830485dbcd0308edf6f7368bc8fd76afa26a270420f34cabea2a6467a0"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.0"
+  path_provider_android:
+    dependency: transitive
+    description:
+      name: path_provider_android
+      sha256: "5d44fc3314d969b84816b569070d7ace0f1dea04bd94a83f74c4829615d22ad8"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.0"
+  path_provider_foundation:
+    dependency: transitive
+    description:
+      name: path_provider_foundation
+      sha256: "1b744d3d774e5a879bb76d6cd1ecee2ba2c6960c03b1020cd35212f6aa267ac5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.3.0"
+  path_provider_linux:
+    dependency: transitive
+    description:
+      name: path_provider_linux
+      sha256: ba2b77f0c52a33db09fc8caf85b12df691bf28d983e84cf87ff6d693cfa007b3
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.0"
+  path_provider_platform_interface:
+    dependency: transitive
+    description:
+      name: path_provider_platform_interface
+      sha256: bced5679c7df11190e1ddc35f3222c858f328fff85c3942e46e7f5589bf9eb84
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.0"
+  path_provider_windows:
+    dependency: transitive
+    description:
+      name: path_provider_windows
+      sha256: ee0e0d164516b90ae1f970bdf29f726f1aa730d7cfc449ecc74c495378b705da
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.0"
+  platform:
+    dependency: transitive
+    description:
+      name: platform
+      sha256: "57c07bf82207aee366dfaa3867b3164e4f03a238a461a11b0e8a3a510d51203d"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.1"
+  plugin_platform_interface:
+    dependency: transitive
+    description:
+      name: plugin_platform_interface
+      sha256: "43798d895c929056255600343db8f049921cbec94d31ec87f1dc5c16c01935dd"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.5"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -196,6 +284,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.6.0"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      sha256: facc8d6582f16042dd49f2463ff1bd6e2c9ef9f3d5da3d9b087e244a7b564b3c
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.2"
   vector_math:
     dependency: transitive
     description:
@@ -212,6 +308,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.1.4-beta"
+  win32:
+    dependency: transitive
+    description:
+      name: win32
+      sha256: "9e82a402b7f3d518fb9c02d0e9ae45952df31b9bf34d77baf19da2de03fc2aaa"
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.0.7"
+  xdg_directories:
+    dependency: transitive
+    description:
+      name: xdg_directories
+      sha256: f0c26453a2d47aa4c2570c6a033246a3fc62da2fe23c7ffdd0a7495086dc0247
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.2"
 sdks:
   dart: ">=3.1.0-185.0.dev <4.0.0"
-  flutter: ">=1.20.0"
+  flutter: ">=3.3.0"

packages/desktop_drop/example/pubspec.yaml

@@ -14,6 +14,8 @@ dependencies:
     path: ../
   cross_file: ^0.3.2
   cupertino_icons: ^1.0.2
+  http: ^1.1.0
+  path_provider: ^2.1.0
 
 dev_dependencies:
   flutter_test:

packages/desktop_drop/lib/desktop_drop.dart

@@ -1 +1,2 @@
 export 'src/drop_target.dart';
+export 'src/desktop_drop_public.dart';

packages/desktop_drop/lib/src/channel.dart

@@ -1,6 +1,7 @@
 import 'dart:convert';
 
 import 'package:cross_file/cross_file.dart';
+import 'package:desktop_drop/src/desktop_drop_public.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
 
@@ -72,15 +73,23 @@ class DesktopDrop {
       case "performOperation_linux":
         // gtk notify 'exit' before 'performOperation'.
         final text = (call.arguments as List<dynamic>)[0] as String;
-        final offset = ((call.arguments as List<dynamic>)[1] as List<dynamic>).cast<double>();
-        final paths = const LineSplitter().convert(text).map((e) {
+        final offset = ((call.arguments as List<dynamic>)[1] as List<dynamic>)
+            .cast<double>();
+        final paths = (await Future.wait(
+                const LineSplitter().convert(text).map(((e) async {
           try {
             return Uri.tryParse(e)?.toFilePath() ?? '';
+          } on UnsupportedError {
+            final handled =
+                await DesktopDropPlugin.onUnsupportedUriHandler?.call(e);
+            if (handled == null || handled.isEmpty) rethrow;
+            return handled;
           } catch (error, stacktrace) {
             debugPrint('failed to parse linux path: $error $stacktrace');
           }
           return '';
-        }).where((e) => e.isNotEmpty);
+        }))))
+            .where((e) => e.isNotEmpty);
         _notifyEvent(DropDoneEvent(
           location: Offset(offset[0], offset[1]),
           files: paths.map((e) => XFile(e)).toList(),

packages/desktop_drop/lib/src/desktop_drop_public.dart

@@ -0,0 +1,14 @@
+typedef DesktopDropUnsupportedUriCallback = Future<String?> Function(
+  String uri,
+);
+
+abstract class DesktopDropPlugin {
+  DesktopDropPlugin._();
+
+  /// set the [onUnsupportedUriHandler] in order to handle custom URI schemes
+  /// that are not `file:`, e.g. useful for handling `http:`, `https:` or any
+  /// other custom URI scheme.
+  ///
+  /// This callback is only relevant on io platforms.
+  static DesktopDropUnsupportedUriCallback? onUnsupportedUriHandler;
+}