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'Save a backup' now writes a sealed .tanemaki file (AES-256-GCM under a key HKDF-derived from the root seed; format TANEBK v1, open and stable). Restoring on the same identity is silent; a copy sealed by another identity asks for the printed recovery code (TANE1 base32, typo-tolerant) and adopts that seed — recovering your bank recovers you. Legacy plain exports still restore. Settings gains a recovery sheet (QR + code PDF). BackupBox/RecoveryCode live in commons_core, pure Dart, TDD.
82 lines
2.5 KiB
Dart
82 lines
2.5 KiB
Dart
import 'dart:typed_data';
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import 'package:flutter/services.dart' show rootBundle;
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import 'package:pdf/pdf.dart';
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import 'package:pdf/widgets.dart' as pw;
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import 'file_service.dart';
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/// Renders the printable recovery sheet — a QR plus the typed code and short
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/// instructions ("keep two paper copies, like your best seed"). All strings
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/// arrive already localized.
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class RecoverySheetService {
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RecoverySheetService({required FileService files}) : _files = files;
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final FileService _files;
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Future<Uint8List> buildPdf({
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required String title,
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required String intro,
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required String code,
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}) async {
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final base = pw.Font.ttf(
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await rootBundle.load('assets/fonts/DejaVuSans.ttf'),
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);
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final bold = pw.Font.ttf(
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await rootBundle.load('assets/fonts/DejaVuSans-Bold.ttf'),
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);
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final doc = pw.Document(
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theme: pw.ThemeData.withFont(base: base, bold: bold),
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);
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doc.addPage(
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pw.Page(
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pageFormat: PdfPageFormat.a4,
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build: (context) => pw.Column(
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crossAxisAlignment: pw.CrossAxisAlignment.start,
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children: [
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pw.Text(title, style: pw.TextStyle(font: bold, fontSize: 20)),
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pw.SizedBox(height: 12),
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pw.Text(intro, style: const pw.TextStyle(fontSize: 11)),
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pw.SizedBox(height: 24),
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pw.Center(
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child: pw.BarcodeWidget(
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barcode: pw.Barcode.qrCode(),
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data: code,
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width: 220,
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height: 220,
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// The code is printed below with the Unicode-capable face;
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// the widget's built-in caption would fall back to Courier.
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drawText: false,
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),
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),
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pw.SizedBox(height: 24),
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pw.Center(
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child: pw.Text(
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code,
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textAlign: pw.TextAlign.center,
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style: pw.TextStyle(font: bold, fontSize: 12),
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),
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),
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],
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),
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),
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);
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return doc.save();
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}
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/// Builds the sheet and asks the user where to keep it. Returns true when
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/// saved, false when they cancelled.
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Future<bool> saveSheet({
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required String title,
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required String intro,
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required String code,
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required String suggestedName,
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}) async {
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final bytes = await buildPdf(title: title, intro: intro, code: code);
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final path = await _files.saveFile(
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suggestedName: suggestedName,
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bytes: bytes,
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);
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return path != null;
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}
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}
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