ente/lib/utils/file_uploader_util.dart

import 'dart:async';
import 'dart:io' as io;
import 'dart:typed_data';

import 'package:archive/archive_io.dart';
import 'package:flutter_sodium/flutter_sodium.dart';
import 'package:logging/logging.dart';
import 'package:motionphoto/motionphoto.dart';
import 'package:path/path.dart';
import 'package:path_provider/path_provider.dart';
import 'package:photo_manager/photo_manager.dart';
import 'package:photos/core/configuration.dart';
import 'package:photos/core/constants.dart';
import 'package:photos/core/errors.dart';
import 'package:photos/models/file.dart' as ente;
import 'package:photos/models/file_type.dart';
import 'package:photos/models/location.dart';
import 'package:photos/utils/crypto_util.dart';
import 'package:photos/utils/file_util.dart';
import 'package:video_thumbnail/video_thumbnail.dart';

final _logger = Logger("FileUtil");
const kMaximumThumbnailCompressionAttempts = 2;

class MediaUploadData {
  final io.File sourceFile;
  final Uint8List thumbnail;
  final bool isDeleted;
  // presents the hash for the original video or image file.
  // for livePhotos, fileHash represents the image hash value
  final String fileHash;
  final String liveVideoHash;
  final String zipHash;

  MediaUploadData(
    this.sourceFile,
    this.thumbnail,
    this.isDeleted, {
    this.fileHash,
    this.liveVideoHash,
    this.zipHash,
  });
}

Future<MediaUploadData> getUploadDataFromEnteFile(ente.File file) async {
  if (file.isSharedMediaToAppSandbox()) {
    return await _getMediaUploadDataFromAppCache(file);
  } else {
    return await _getMediaUploadDataFromAssetFile(file);
  }
}

Future<MediaUploadData> _getMediaUploadDataFromAssetFile(ente.File file) async {
  io.File sourceFile;
  Uint8List thumbnailData;
  bool isDeleted;
  String fileHash, livePhotoVideoHash, zipHash;

  // The timeouts are to safeguard against https://github.com/CaiJingLong/flutter_photo_manager/issues/467
  final asset = await file
      .getAsset()
      .timeout(const Duration(seconds: 3))
      .catchError((e) async {
    if (e is TimeoutException) {
      _logger.info("Asset fetch timed out for " + file.toString());
      return await file.getAsset();
    } else {
      throw e;
    }
  });
  if (asset == null) {
    throw InvalidFileError("asset is null");
  }
  sourceFile = await asset.originFile
      .timeout(const Duration(seconds: 3))
      .catchError((e) async {
    if (e is TimeoutException) {
      _logger.info("Origin file fetch timed out for " + file.toString());
      return await asset.originFile;
    } else {
      throw e;
    }
  });
  if (sourceFile == null || !sourceFile.existsSync()) {
    throw InvalidFileError("source fill is null or do not exist");
  }

  // h4ck to fetch location data if missing (thank you Android Q+) lazily only during uploads
  await _decorateEnteFileData(file, asset);
  fileHash = Sodium.bin2base64(await CryptoUtil.getHash(sourceFile));

  if (file.fileType == FileType.livePhoto && io.Platform.isIOS) {
    final io.File videoUrl = await Motionphoto.getLivePhotoFile(file.localID);
    if (videoUrl == null || !videoUrl.existsSync()) {
      String errMsg =
          "missing livePhoto url for  ${file.toString()} with subType ${file.fileSubType}";
      _logger.severe(errMsg);
      throw InvalidFileUploadState(errMsg);
    }
    livePhotoVideoHash = Sodium.bin2base64(await CryptoUtil.getHash(videoUrl));
    final tempPath = Configuration.instance.getTempDirectory();
    // .elp -> ente live photo
    final livePhotoPath = tempPath + file.generatedID.toString() + ".elp";
    _logger.fine("Uploading zipped live photo from " + livePhotoPath);
    var encoder = ZipFileEncoder();
    encoder.create(livePhotoPath);
    encoder.addFile(videoUrl, "video" + extension(videoUrl.path));
    encoder.addFile(sourceFile, "image" + extension(sourceFile.path));
    encoder.close();
    // delete the temporary video and image copy (only in IOS)
    if (io.Platform.isIOS) {
      await sourceFile.delete();
    }
    // new sourceFile which needs to be uploaded
    sourceFile = io.File(livePhotoPath);
    zipHash = Sodium.bin2base64(await CryptoUtil.getHash(sourceFile));
  }

  thumbnailData = await asset.thumbnailDataWithSize(
    const ThumbnailSize(kThumbnailLargeSize, kThumbnailLargeSize),
    quality: kThumbnailQuality,
  );
  if (thumbnailData == null) {
    throw InvalidFileError("unable to get asset thumbData");
  }
  int compressionAttempts = 0;
  while (thumbnailData.length > kThumbnailDataLimit &&
      compressionAttempts < kMaximumThumbnailCompressionAttempts) {
    _logger.info("Thumbnail size " + thumbnailData.length.toString());
    thumbnailData = await compressThumbnail(thumbnailData);
    _logger
        .info("Compressed thumbnail size " + thumbnailData.length.toString());
    compressionAttempts++;
  }

  isDeleted = asset == null || !(await asset.exists);
  return MediaUploadData(
    sourceFile,
    thumbnailData,
    isDeleted,
    fileHash: fileHash,
    liveVideoHash: livePhotoVideoHash,
    zipHash: zipHash,
  );
}

Future<void> _decorateEnteFileData(ente.File file, AssetEntity asset) async {
  // h4ck to fetch location data if missing (thank you Android Q+) lazily only during uploads
  if (file.location == null ||
      (file.location.latitude == 0 && file.location.longitude == 0)) {
    final latLong = await asset.latlngAsync();
    file.location = Location(latLong.latitude, latLong.longitude);
  }

  if (file.title == null || file.title.isEmpty) {
    _logger.warning("Title was missing ${file.tag()}");
    file.title = await asset.titleAsync;
  }
}

Future<MediaUploadData> _getMediaUploadDataFromAppCache(ente.File file) async {
  io.File sourceFile;
  Uint8List thumbnailData;
  bool isDeleted = false;
  var localPath = getSharedMediaFilePath(file);
  sourceFile = io.File(localPath);
  if (!sourceFile.existsSync()) {
    _logger.warning("File doesn't exist in app sandbox");
    throw InvalidFileError("File doesn't exist in app sandbox");
  }
  try {
    thumbnailData = await getThumbnailFromInAppCacheFile(file);
    return MediaUploadData(sourceFile, thumbnailData, isDeleted);
  } catch (e, s) {
    _logger.severe("failed to generate thumbnail", e, s);
    throw InvalidFileError(
      "thumbnail generation failed for fileType: ${file.fileType.toString()}",
    );
  }
}

Future<Uint8List> getThumbnailFromInAppCacheFile(ente.File file) async {
  var localFile = io.File(getSharedMediaFilePath(file));
  if (!localFile.existsSync()) {
    return null;
  }
  if (file.fileType == FileType.video) {
    final thumbnailFilePath = await VideoThumbnail.thumbnailFile(
      video: localFile.path,
      imageFormat: ImageFormat.JPEG,
      thumbnailPath: (await getTemporaryDirectory()).path,
      maxWidth: kThumbnailLargeSize,
      quality: 80,
    );
    localFile = io.File(thumbnailFilePath);
  }
  var thumbnailData = await localFile.readAsBytes();
  int compressionAttempts = 0;
  while (thumbnailData.length > kThumbnailDataLimit &&
      compressionAttempts < kMaximumThumbnailCompressionAttempts) {
    _logger.info("Thumbnail size " + thumbnailData.length.toString());
    thumbnailData = await compressThumbnail(thumbnailData);
    _logger
        .info("Compressed thumbnail size " + thumbnailData.length.toString());
    compressionAttempts++;
  }
  return thumbnailData;
}