feat: torrent scheme deep link and file associations (#866)

ui/flutter/lib/util/scheme_register/entry/scheme_register_native.dart

@@ -0,0 +1,92 @@
+import 'dart:io';
+
+import 'package:gopeed/util/util.dart';
+import 'package:win32_registry/win32_registry.dart';
+
+doRegisterUrlScheme(String scheme) {
+  if (Util.isWindows()) {
+    final schemeKey = 'Software\\Classes\\$scheme';
+    final appPath = Platform.resolvedExecutable;
+
+    _upsertRegistry(
+      schemeKey,
+      'URL Protocol',
+      '',
+    );
+    _upsertRegistry(
+      '$schemeKey\\shell\\open\\command',
+      '',
+      '"$appPath" "%1"',
+    );
+  }
+}
+
+doUnregisterUrlScheme(String scheme) {
+  if (Util.isWindows()) {
+    Registry.currentUser
+        .deleteKey('Software\\Classes\\$scheme', recursive: true);
+  }
+}
+
+const _torrentRegKey = 'Software\\Classes\\.torrent';
+const _torrentRegValue = 'Gopeed_torrent';
+const _torrentAppRegKey = 'Software\\Classes\\$_torrentRegValue';
+
+/// Register as the system's default torrent client
+/// 1. Register the scheme "magnet"
+/// 2. Register the file type ".torrent"
+doRegisterDefaultTorrentClient() {
+  if (Util.isWindows()) {
+    doRegisterUrlScheme("magnet");
+
+    final appPath = Platform.resolvedExecutable;
+    final iconPath =
+        '${File(appPath).parent.path}\\data\\flutter_assets\\assets\\tray_icon\\icon.ico';
+    _upsertRegistry(
+      _torrentRegKey,
+      '',
+      _torrentRegValue,
+    );
+    _upsertRegistry(
+      _torrentAppRegKey,
+      '',
+      'Torrent file',
+    );
+    _upsertRegistry(
+      '$_torrentAppRegKey\\DefaultIcon',
+      '',
+      iconPath,
+    );
+    _upsertRegistry(
+      '$_torrentAppRegKey\\shell\\open\\command',
+      '',
+      '"$appPath" "file:///%1"',
+    );
+  }
+}
+
+doUnregisterDefaultTorrentClient() {
+  if (Util.isWindows()) {
+    doUnregisterUrlScheme("magnet");
+
+    Registry.currentUser.deleteKey(_torrentRegKey, recursive: true);
+    Registry.currentUser.deleteKey(_torrentAppRegKey, recursive: true);
+  }
+}
+
+// Add Windows registry key and value if not exists
+_upsertRegistry(String keyPath, String valueName, String value) {
+  RegistryKey regKey;
+  try {
+    regKey = Registry.openPath(RegistryHive.currentUser,
+        path: keyPath, desiredAccessRights: AccessRights.allAccess);
+  } catch (e) {
+    regKey = Registry.currentUser.createKey(keyPath);
+  }
+
+  if (regKey.getValueAsString(valueName) != value) {
+    regKey
+        .createValue(RegistryValue(valueName, RegistryValueType.string, value));
+  }
+  regKey.close();
+}

ui/flutter/lib/util/scheme_register/scheme_register.dart

@@ -0,0 +1,11 @@
+import 'scheme_register_stub.dart'
+    if (dart.library.io) 'entry/scheme_register_native.dart';
+
+registerUrlScheme(String scheme) => doRegisterUrlScheme(scheme);
+
+unregisterUrlScheme(String scheme) => doUnregisterUrlScheme(scheme);
+
+registerDefaultTorrentClient() => doRegisterDefaultTorrentClient();
+
+unregisterDefaultTorrentClient() => doUnregisterDefaultTorrentClient();
+

ui/flutter/lib/util/scheme_register/scheme_register_stub.dart

@@ -0,0 +1,7 @@
+doRegisterUrlScheme(String scheme) => throw UnimplementedError();
+
+doUnregisterUrlScheme(String scheme) => throw UnimplementedError();
+
+doRegisterDefaultTorrentClient() => throw UnimplementedError();
+
+doUnregisterDefaultTorrentClient() => throw UnimplementedError();