diff options
Diffstat (limited to 'src/main/java/com/keuin/kbackupfabric/util/backup')
6 files changed, 57 insertions, 5 deletions
diff --git a/src/main/java/com/keuin/kbackupfabric/util/backup/BackupFilesystemUtil.java b/src/main/java/com/keuin/kbackupfabric/util/backup/BackupFilesystemUtil.java index 54c2f58..d0c7500 100644 --- a/src/main/java/com/keuin/kbackupfabric/util/backup/BackupFilesystemUtil.java +++ b/src/main/java/com/keuin/kbackupfabric/util/backup/BackupFilesystemUtil.java @@ -70,7 +70,7 @@ public final class BackupFilesystemUtil { return -1; } - public static String humanFileSize(long size) { + public static String getFriendlyFileSizeString(long size) { double fileSize = size * 1.0 / 1024 / 1024; // Default unit is MB if (fileSize > 1000) //msgInfo(context, String.format("File size: %.2fGB", fileSize / 1024)); diff --git a/src/main/java/com/keuin/kbackupfabric/util/backup/builder/ObjectTreeBackupFileNameBuilder.java b/src/main/java/com/keuin/kbackupfabric/util/backup/builder/ObjectTreeBackupFileNameBuilder.java index 3c15741..c3d8257 100644 --- a/src/main/java/com/keuin/kbackupfabric/util/backup/builder/ObjectTreeBackupFileNameBuilder.java +++ b/src/main/java/com/keuin/kbackupfabric/util/backup/builder/ObjectTreeBackupFileNameBuilder.java @@ -8,13 +8,13 @@ import java.time.LocalDateTime; public class ObjectTreeBackupFileNameBuilder implements BackupFileNameBuilder { private static final ObjectTreeBackupFileNameBuilder instance = new ObjectTreeBackupFileNameBuilder(); - public static ObjectTreeBackupFileNameBuilder getInstance() { + public static ObjectTreeBackupFileNameBuilder getInstance() { return instance; } @Override public String build(LocalDateTime time, String backupName) { String timeString = BackupNameTimeFormatter.localDateTimeToString(time); - return String.format("%s%s_%s%s", BackupFilesystemUtil.getBackupFileNamePrefix(),timeString,backupName,".json"); + return String.format("%s%s_%s%s", BackupFilesystemUtil.getBackupFileNamePrefix(), timeString, backupName, ".json"); } } diff --git a/src/main/java/com/keuin/kbackupfabric/util/backup/builder/PrimitiveZipBackupFileNameBuilder.java b/src/main/java/com/keuin/kbackupfabric/util/backup/builder/PrimitiveZipBackupFileNameBuilder.java index f910c37..6d8b5f5 100644 --- a/src/main/java/com/keuin/kbackupfabric/util/backup/builder/PrimitiveZipBackupFileNameBuilder.java +++ b/src/main/java/com/keuin/kbackupfabric/util/backup/builder/PrimitiveZipBackupFileNameBuilder.java @@ -9,14 +9,14 @@ public class PrimitiveZipBackupFileNameBuilder implements BackupFileNameBuilder private static final PrimitiveZipBackupFileNameBuilder instance = new PrimitiveZipBackupFileNameBuilder(); - public static PrimitiveZipBackupFileNameBuilder getInstance() { + public static PrimitiveZipBackupFileNameBuilder getInstance() { return instance; } @Override public String build(LocalDateTime time, String backupName) { String timeString = BackupNameTimeFormatter.localDateTimeToString(time); - return String.format("%s%s_%s%s", BackupFilesystemUtil.getBackupFileNamePrefix(),timeString,backupName,".zip"); + return String.format("%s%s_%s%s", BackupFilesystemUtil.getBackupFileNamePrefix(), timeString, backupName, ".zip"); } } diff --git a/src/main/java/com/keuin/kbackupfabric/util/backup/inc/ObjectCollectionManager.java b/src/main/java/com/keuin/kbackupfabric/util/backup/inc/ObjectCollectionManager.java new file mode 100644 index 0000000..9560261 --- /dev/null +++ b/src/main/java/com/keuin/kbackupfabric/util/backup/inc/ObjectCollectionManager.java @@ -0,0 +1,11 @@ +package com.keuin.kbackupfabric.util.backup.inc; + +/** + * Incremental backup is implemented as git-like file collection. + * Files are called `objects`, the collection contains all files distinguished by their + * identifiers. Usually, identifier is the combination of hash and other short information (such as size and another hash). + * The identifier should use hashes that are strong enough, to prevent possible collisions. + */ +public class ObjectCollectionManager { + +} diff --git a/src/main/java/com/keuin/kbackupfabric/util/backup/inc/identifier/ObjectIdentifier.java b/src/main/java/com/keuin/kbackupfabric/util/backup/inc/identifier/ObjectIdentifier.java new file mode 100644 index 0000000..079f49d --- /dev/null +++ b/src/main/java/com/keuin/kbackupfabric/util/backup/inc/identifier/ObjectIdentifier.java @@ -0,0 +1,9 @@ +package com.keuin.kbackupfabric.util.backup.inc.identifier; + +/** + * The identifier distinguishing files in the object collection. + * It should be based on cryptographic hash function in order to prevent possible attacks to the backup system. + * All identifiers should be immutable and implement their own equals method. + */ +public interface ObjectIdentifier { +} diff --git a/src/main/java/com/keuin/kbackupfabric/util/backup/inc/identifier/SingleHashIdentifier.java b/src/main/java/com/keuin/kbackupfabric/util/backup/inc/identifier/SingleHashIdentifier.java new file mode 100644 index 0000000..50b23bb --- /dev/null +++ b/src/main/java/com/keuin/kbackupfabric/util/backup/inc/identifier/SingleHashIdentifier.java @@ -0,0 +1,32 @@ +package com.keuin.kbackupfabric.util.backup.inc.identifier; + +import java.io.File; +import java.util.Arrays; + +/** + * A simple identifier based on a single hash function. + */ +public abstract class SingleHashIdentifier implements ObjectIdentifier { + + private final byte[] hash; + + protected SingleHashIdentifier(byte[] hash) { + this.hash = Arrays.copyOf(hash, hash.length); + } + + /** + * The hash function. + * + * @param file the file to be hashed. + * @return the hash bytes. + */ + protected abstract byte[] hash(File file); + + @Override + public boolean equals(Object obj) { + if (!(obj instanceof SingleHashIdentifier)) { + return false; + } + return Arrays.equals(hash, ((SingleHashIdentifier) obj).hash); + } +} |