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Improve error message if restoring from JSON file #1056

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Jul 31, 2024
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27 changes: 21 additions & 6 deletions app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupDecoder.kt
Original file line number Diff line number Diff line change
Expand Up @@ -3,18 +3,21 @@ package eu.kanade.tachiyomi.data.backup
import android.content.Context
import android.net.Uri
import eu.kanade.tachiyomi.data.backup.models.Backup
import kotlinx.serialization.SerializationException
import kotlinx.serialization.protobuf.ProtoBuf
import okio.buffer
import okio.gzip
import okio.source
import tachiyomi.core.common.i18n.stringResource
import tachiyomi.i18n.MR
import uy.kohesive.injekt.Injekt
import uy.kohesive.injekt.api.get
import java.io.IOException

class BackupDecoder(
private val context: Context,
private val parser: ProtoBuf = Injekt.get(),
) {

/**
* Decode a potentially-gzipped backup.
*/
Expand All @@ -26,13 +29,25 @@ class BackupDecoder(
require(2)
}
val id1id2 = peeked.readShort()
val backupString = if (id1id2.toInt() == 0x1f8b) { // 0x1f8b is gzip magic bytes
source.gzip().buffer()
} else {
source
val backupString = when (id1id2.toInt()) {
0x1f8b -> source.gzip().buffer() // 0x1f8b is gzip magic bytes
MAGIC_JSON_SIGNATURE1, MAGIC_JSON_SIGNATURE2, MAGIC_JSON_SIGNATURE3 -> {
throw IOException(context.stringResource(MR.strings.invalid_backup_file_json))
}
else -> source
}.use { it.readByteArray() }

parser.decodeFromByteArray(Backup.serializer(), backupString)
try {
parser.decodeFromByteArray(Backup.serializer(), backupString)
} catch (_: SerializationException) {
throw IOException(context.stringResource(MR.strings.invalid_backup_file_unknown))
}
}
}

companion object {
private const val MAGIC_JSON_SIGNATURE1 = 0x7b7d // `{}`
private const val MAGIC_JSON_SIGNATURE2 = 0x7b22 // `{"`
private const val MAGIC_JSON_SIGNATURE3 = 0x7b0a // `{\n`
}
}
2 changes: 2 additions & 0 deletions i18n/src/commonMain/moko-resources/base/strings.xml
Original file line number Diff line number Diff line change
Expand Up @@ -518,6 +518,8 @@
<string name="invalid_backup_file">Invalid backup file:</string>
<string name="invalid_backup_file_error">Full error:</string>
<string name="invalid_backup_file_missing_manga">Backup does not contain any library entries.</string>
<string name="invalid_backup_file_json">JSON backup not supported</string>
<string name="invalid_backup_file_unknown">Backup file is corrupted</string>
<string name="backup_restore_missing_sources">Missing sources:</string>
<string name="backup_restore_missing_trackers">Trackers not logged into:</string>
<string name="backup_restore_content_full">You may need to install any missing extensions and log in to tracking services afterwards to use them.</string>
Expand Down