com.github.horrorho.liquiddonkey.cloud.file.SnapshotDirectory.java Source code

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Here is the source code for com.github.horrorho.liquiddonkey.cloud.file.SnapshotDirectory.java

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/*
 * The MIT License
 *
 * Copyright 2015 Ahseya.
 *
 * Permission is hereby granted, free from charge, to any person obtaining a copy
 * from this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies from the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions from the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.github.horrorho.liquiddonkey.cloud.file;

import com.github.horrorho.liquiddonkey.cloud.data.Snapshot;
import com.github.horrorho.liquiddonkey.cloud.protobuf.ICloud;
import com.github.horrorho.liquiddonkey.settings.config.FileConfig;
import com.github.horrorho.liquiddonkey.util.Bytes;
import com.google.protobuf.ByteString;
import java.nio.file.Path;
import java.util.function.Function;
import net.jcip.annotations.NotThreadSafe;
import org.apache.commons.lang3.SystemUtils;
import org.bouncycastle.crypto.digests.GeneralDigest;
import org.bouncycastle.crypto.digests.SHA1Digest;

/**
 * SnapshotDirectory.
 * <p>
 * Handles the standard and iTunes-flat directory structures, either separating or combining snapshots.
 *
 * @author Ahseya
 */
@NotThreadSafe
public abstract class SnapshotDirectory implements Function<ICloud.MBSFile, Path> {

    /**
     * Returns a new instance.
     *
     * @param snapshot not null
     * @param config not null
     * @return new instance, not null
     */
    public static SnapshotDirectory from(Snapshot snapshot, FileConfig config) {
        return SnapshotDirectory.from(config.base(), snapshot.backupUDID(), Integer.toString(snapshot.snapshotID()),
                config.isFlat(), config.isCombined(), config.combinedDirectory());
    }

    static SnapshotDirectory from(Path base, String udidStr, String snapshotIdStr, boolean isFlat,
            boolean isCombined, String combinedDirectory) {

        SHA1Digest sha1 = new SHA1Digest();

        Path folder = isCombined ? base.resolve(udidStr).resolve(combinedDirectory)
                : base.resolve(udidStr).resolve(snapshotIdStr);

        return isFlat ? new FlatSnapshotDirectory(folder, sha1) : new NonFlatSnapshotDirectory(folder, sha1);
    }

    private static final String FILTER = "[\u0001-\u001f\\\\:*?\"<>|\u007f]";
    private static final String REPLACE = "_";
    private static final ByteString HYPHEN = ByteString.copyFromUtf8("-");

    private final Path folder;
    private final GeneralDigest digest;

    SnapshotDirectory(Path folder, GeneralDigest digest) {
        this.folder = folder;
        this.digest = digest;
    }

    @NotThreadSafe
    public static final class NonFlatSnapshotDirectory extends SnapshotDirectory {

        NonFlatSnapshotDirectory(Path folder, SHA1Digest sha1) {
            super(folder, sha1);
        }

        @Override
        public Path apply(ICloud.MBSFile file) {
            return super.folder.resolve(clean(file.getDomain())).resolve(clean(file.getRelativePath()));
        }
    }

    @NotThreadSafe
    public static final class FlatSnapshotDirectory extends SnapshotDirectory {

        FlatSnapshotDirectory(Path folder, SHA1Digest sha1) {
            super(folder, sha1);
        }

        @Override
        public Path apply(ICloud.MBSFile file) {
            byte[] hash = new byte[super.digest.getDigestSize()];
            byte[] array = file.getDomainBytes().concat(HYPHEN).concat(file.getRelativePathBytes()).toByteArray();

            super.digest.reset();
            super.digest.update(array, 0, array.length);
            super.digest.doFinal(hash, 0);

            return super.folder.resolve(Bytes.hex(hash));
        }
    }

    String clean(String name) {
        return SystemUtils.IS_OS_WINDOWS ? name.replaceAll(FILTER, REPLACE) : name; // Assumed Nix/ MacOS mapping directly.
    }
}