1 /* 2 * Copyright (C) 2015, 2017, Dariusz Luksza <dariusz@luksza.org> 3 * and other copyright owners as documented in the project's IP log. 4 * 5 * This program and the accompanying materials are made available 6 * under the terms of the Eclipse Distribution License v1.0 which 7 * accompanies this distribution, is reproduced below, and is 8 * available at http://www.eclipse.org/org/documents/edl-v10.php 9 * 10 * All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or 13 * without modification, are permitted provided that the following 14 * conditions are met: 15 * 16 * - Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials provided 22 * with the distribution. 23 * 24 * - Neither the name of the Eclipse Foundation, Inc. nor the 25 * names of its contributors may be used to endorse or promote 26 * products derived from this software without specific prior 27 * written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 30 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 31 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 34 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 35 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 37 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 38 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 40 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 41 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 42 */ 43 44 package org.eclipse.jgit.lfs.lib; 45 46 import java.io.IOException; 47 48 import org.eclipse.jgit.errors.IncorrectObjectTypeException; 49 import org.eclipse.jgit.errors.MissingObjectException; 50 import org.eclipse.jgit.lfs.LfsPointer; 51 import org.eclipse.jgit.lib.ObjectId; 52 import org.eclipse.jgit.lib.ObjectLoader; 53 import org.eclipse.jgit.lib.ObjectStream; 54 import org.eclipse.jgit.treewalk.TreeWalk; 55 import org.eclipse.jgit.treewalk.filter.TreeFilter; 56 57 /** 58 * Detects Large File pointers, as described in [1] in Git repository. 59 * 60 * [1] https://github.com/github/git-lfs/blob/master/docs/spec.md 61 * 62 * @since 4.7 63 */ 64 public class LfsPointerFilter extends TreeFilter { 65 66 private LfsPointer pointer; 67 68 /** 69 * @return {@link LfsPointer} or {@code null} 70 */ 71 public LfsPointer getPointer() { 72 return pointer; 73 } 74 75 @Override 76 public boolean include(TreeWalk walk) throws MissingObjectException, 77 IncorrectObjectTypeException, IOException { 78 pointer = null; 79 if (walk.isSubtree()) { 80 return walk.isRecursive(); 81 } 82 ObjectId objectId = walk.getObjectId(0); 83 ObjectLoader object = walk.getObjectReader().open(objectId); 84 if (object.getSize() > 1024) { 85 return false; 86 } 87 88 try (ObjectStream stream = object.openStream()) { 89 pointer = LfsPointer.parseLfsPointer(stream); 90 return pointer != null; 91 } 92 } 93 94 @Override 95 public boolean shouldBeRecursive() { 96 return false; 97 } 98 99 @Override 100 public TreeFilter clone() { 101 return new LfsPointerFilter(); 102 } 103 }