82 lines
2.4 KiB
Dart
82 lines
2.4 KiB
Dart
import 'dart:typed_data';
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import 'dart:ui' as ui;
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import 'package:file_selector/file_selector.dart';
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import 'package:image/image.dart' as metadata;
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import '../models/identity.dart';
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import 'contracts.dart';
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class FilePhotoService implements PhotoService {
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const FilePhotoService();
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static const maxBytes = 10 * 1024 * 1024;
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@override
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Future<Photo?> pick() async {
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try {
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final file = await openFile(
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acceptedTypeGroups: const [
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XTypeGroup(
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label: 'JPEG / PNG',
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extensions: ['jpg', 'jpeg', 'png'],
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mimeTypes: ['image/jpeg', 'image/png'],
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uniformTypeIdentifiers: ['public.jpeg', 'public.png'],
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),
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],
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);
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if (file == null) return null;
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if (await file.length() > maxBytes)
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throw const KycException(KycError.tooLarge);
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final bytes = await file.readAsBytes();
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return await validate(bytes);
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} on KycException {
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rethrow;
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} catch (_) {
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throw const KycException(KycError.permission);
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}
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}
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static Future<Photo> validate(Uint8List bytes) async {
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try {
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if (bytes.length > maxBytes) throw const KycException(KycError.tooLarge);
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final png =
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bytes.length > 8 &&
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bytes[0] == 137 &&
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bytes[1] == 80 &&
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bytes[2] == 78 &&
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bytes[3] == 71;
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final jpg =
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bytes.length > 3 &&
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bytes[0] == 255 &&
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bytes[1] == 216 &&
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bytes[2] == 255;
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if (!png && !jpg) throw const KycException(KycError.format);
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final metadata.Decoder decoder = png
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? metadata.PngDecoder()
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: metadata.JpegDecoder();
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final info = decoder.startDecode(bytes);
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if (info == null) throw const KycException(KycError.unreadable);
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if (info.width < 600 || info.height < 600)
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throw const KycException(KycError.tooSmall);
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if (info.width * info.height > 40000000)
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throw const KycException(KycError.tooLarge);
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final codec = await ui.instantiateImageCodec(
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bytes,
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targetWidth: 1000,
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allowUpscaling: false,
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);
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try {
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final frame = await codec.getNextFrame();
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frame.image.dispose();
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} finally {
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codec.dispose();
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}
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return Photo(bytes);
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} on KycException {
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rethrow;
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} catch (_) {
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throw const KycException(KycError.unreadable);
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}
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}
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}
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