117 lines
4.3 KiB
Dart
117 lines
4.3 KiB
Dart
import 'dart:convert';
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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/event_bus.dart';
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import 'package:photos/core/network.dart';
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import 'package:photos/db/files_db.dart';
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import 'package:photos/events/remote_sync_event.dart';
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import 'package:photos/models/file.dart';
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import 'package:photos/models/magic_metadata.dart';
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import 'package:photos/utils/crypto_util.dart';
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import 'package:photos/utils/file_download_util.dart';
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class DiffFetcher {
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final _logger = Logger("DiffFetcher");
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final _dio = Network.instance.getDio();
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Future<Diff> getEncryptedFilesDiff(
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int collectionID, int sinceTime, int limit) async {
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try {
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final response = await _dio.get(
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Configuration.instance.getHttpEndpoint() + "/collections/diff",
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options: Options(
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headers: {"X-Auth-Token": Configuration.instance.getToken()}),
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queryParameters: {
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"collectionID": collectionID,
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"sinceTime": sinceTime,
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"limit": limit,
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},
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);
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final files = <File>[];
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if (response != null) {
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Bus.instance.fire(RemoteSyncEvent(true));
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final diff = response.data["diff"] as List;
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final startTime = DateTime.now();
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final existingFiles =
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await FilesDB.instance.getUploadedFileIDs(collectionID);
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final deletedFiles = <File>[];
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for (final item in diff) {
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final file = File();
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file.uploadedFileID = item["id"];
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file.collectionID = item["collectionID"];
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if (item["isDeleted"]) {
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if (existingFiles.contains(file.uploadedFileID)) {
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deletedFiles.add(file);
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}
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continue;
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}
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if (existingFiles.contains(file.uploadedFileID)) {
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final existingFile = await FilesDB.instance
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.getUploadedFile(file.uploadedFileID, file.collectionID);
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if (existingFile != null) {
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file.generatedID = existingFile.generatedID;
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}
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}
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file.updationTime = item["updationTime"];
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file.ownerID = item["ownerID"];
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file.encryptedKey = item["encryptedKey"];
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file.keyDecryptionNonce = item["keyDecryptionNonce"];
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file.fileDecryptionHeader = item["file"]["decryptionHeader"];
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file.thumbnailDecryptionHeader =
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item["thumbnail"]["decryptionHeader"];
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file.metadataDecryptionHeader = item["metadata"]["decryptionHeader"];
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final fileDecryptionKey = decryptFileKey(file);
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final encodedMetadata = await CryptoUtil.decryptChaCha(
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Sodium.base642bin(item["metadata"]["encryptedData"]),
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fileDecryptionKey,
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Sodium.base642bin(file.metadataDecryptionHeader),
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);
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Map<String, dynamic> metadata =
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jsonDecode(utf8.decode(encodedMetadata));
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file.applyMetadata(metadata);
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if (item['magicMetadata'] != null) {
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final utfEncodedMmd = await CryptoUtil.decryptChaCha(
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Sodium.base642bin(item['magicMetadata']['data']),
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fileDecryptionKey,
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Sodium.base642bin(item['magicMetadata']['header']));
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file.mMdEncodedJson = utf8.decode(utfEncodedMmd);
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file.mMdVersion = item['magicMetadata']['version'];
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file.magicMetadata =
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MagicMetadata.fromEncodedJson(file.mMdEncodedJson);
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}
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files.add(file);
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}
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final endTime = DateTime.now();
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_logger.info("time for parsing " +
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files.length.toString() +
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": " +
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Duration(
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microseconds: (endTime.microsecondsSinceEpoch -
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startTime.microsecondsSinceEpoch))
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.inMilliseconds
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.toString());
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return Diff(files, deletedFiles, diff.length);
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} else {
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Bus.instance.fire(RemoteSyncEvent(false));
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return Diff(<File>[], <File>[], 0);
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}
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} catch (e, s) {
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_logger.severe(e, s);
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rethrow;
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}
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}
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}
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class Diff {
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final List<File> updatedFiles;
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final List<File> deletedFiles;
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final int fetchCount;
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Diff(this.updatedFiles, this.deletedFiles, this.fetchCount);
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}
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