74 lines
2.5 KiB
Dart
74 lines
2.5 KiB
Dart
import 'dart:io' as io;
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import 'dart:typed_data';
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import 'package:dio/dio.dart';
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import 'package:flutter_sodium/flutter_sodium.dart';
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import 'package:logging/logging.dart';
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import 'package:photos/core/configuration.dart';
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import 'package:photos/core/network.dart';
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import 'package:photos/models/file.dart' as ente;
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import 'package:photos/services/collections_service.dart';
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import 'package:photos/utils/crypto_util.dart';
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final _logger = Logger("file_download_util");
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Future<io.File?> downloadAndDecrypt(
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ente.File file, {
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ProgressCallback? progressCallback,
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}) {
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_logger.info("Downloading file " + file.uploadedFileID.toString());
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final encryptedFilePath = Configuration.instance.getTempDirectory() +
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file.generatedID.toString() +
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".encrypted";
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final encryptedFile = io.File(encryptedFilePath);
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final startTime = DateTime.now().millisecondsSinceEpoch;
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return Network.instance
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.getDio()
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.download(
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file.downloadUrl,
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encryptedFilePath,
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options: Options(
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headers: {"X-Auth-Token": Configuration.instance.getToken()},
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),
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onReceiveProgress: progressCallback,
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)
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.then((response) async {
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if (response.statusCode != 200) {
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_logger.warning("Could not download file: ", response.toString());
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return null;
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} else if (!encryptedFile.existsSync()) {
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_logger.warning("File was not downloaded correctly.");
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return null;
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}
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_logger.info("File downloaded: " + file.uploadedFileID.toString());
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_logger.info(
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"Download speed: " +
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(await io.File(encryptedFilePath).length() /
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(DateTime.now().millisecondsSinceEpoch - startTime))
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.toString() +
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"kBps",
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);
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final decryptedFilePath = Configuration.instance.getTempDirectory() +
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file.generatedID.toString() +
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".decrypted";
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final decryptedFile = io.File(decryptedFilePath);
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await CryptoUtil.decryptFile(
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encryptedFilePath,
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decryptedFilePath,
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Sodium.base642bin(file.fileDecryptionHeader!),
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decryptFileKey(file),
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);
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_logger.info("File decrypted: " + file.uploadedFileID.toString());
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await encryptedFile.delete();
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return decryptedFile;
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});
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}
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Uint8List decryptFileKey(ente.File file) {
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final encryptedKey = Sodium.base642bin(file.encryptedKey!);
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final nonce = Sodium.base642bin(file.keyDecryptionNonce!);
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final collectionKey =
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CollectionsService.instance.getCollectionKey(file.collectionID!);
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return CryptoUtil.decryptSync(encryptedKey, collectionKey, nonce);
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}
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