| /* |
| * Copyright (C) 2015, Matthias Sohn <matthias.sohn@sap.com> and others |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0 which is available at |
| * https://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| package org.eclipse.jgit.lfs.lib; |
| |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| import java.text.MessageFormat; |
| |
| import org.eclipse.jgit.lfs.internal.LfsText; |
| |
| /** |
| * Misc. constants used throughout JGit LFS extension. |
| * |
| * @since 4.3 |
| */ |
| @SuppressWarnings("nls") |
| public final class Constants { |
| /** |
| * lfs folder/section/filter name |
| * |
| * @since 4.6 |
| */ |
| public static final String LFS = "lfs"; |
| |
| /** |
| * Hash function used natively by Git LFS extension for large objects. |
| * |
| * @since 4.6 |
| */ |
| public static final String LONG_HASH_FUNCTION = "SHA-256"; |
| |
| /** |
| * A Git LFS large object hash is 256 bits, i.e. 32 bytes. |
| * <p> |
| * Changing this assumption is not going to be as easy as changing this |
| * declaration. |
| */ |
| public static final int LONG_OBJECT_ID_LENGTH = 32; |
| |
| /** |
| * A Git LFS large object can be expressed as a 64 character string of |
| * hexadecimal digits. |
| * |
| * @see #LONG_OBJECT_ID_LENGTH |
| */ |
| public static final int LONG_OBJECT_ID_STRING_LENGTH = LONG_OBJECT_ID_LENGTH |
| * 2; |
| |
| /** |
| * LFS upload operation. |
| * |
| * @since 4.7 |
| */ |
| public static final String UPLOAD = "upload"; |
| |
| /** |
| * LFS download operation. |
| * |
| * @since 4.7 |
| */ |
| public static final String DOWNLOAD = "download"; |
| |
| /** |
| * LFS verify operation. |
| * |
| * @since 4.7 |
| */ |
| public static final String VERIFY = "verify"; |
| |
| /** |
| * Prefix for all LFS related filters. |
| * |
| * @since 4.11 |
| */ |
| public static final String ATTR_FILTER_DRIVER_PREFIX = "lfs/"; |
| |
| /** |
| * Create a new digest function for objects. |
| * |
| * @return a new digest object. |
| * @throws java.lang.RuntimeException |
| * this Java virtual machine does not support the required hash |
| * function. Very unlikely given that JGit uses a hash function |
| * that is in the Java reference specification. |
| */ |
| public static MessageDigest newMessageDigest() { |
| try { |
| return MessageDigest.getInstance(LONG_HASH_FUNCTION); |
| } catch (NoSuchAlgorithmException nsae) { |
| throw new RuntimeException(MessageFormat.format( |
| LfsText.get().requiredHashFunctionNotAvailable, |
| LONG_HASH_FUNCTION), nsae); |
| } |
| } |
| |
| static { |
| if (LONG_OBJECT_ID_LENGTH != newMessageDigest().getDigestLength()) |
| throw new LinkageError( |
| LfsText.get().incorrectLONG_OBJECT_ID_LENGTH); |
| } |
| |
| /** |
| * Content type used by LFS REST API as defined in <a href= |
| * "https://github.com/github/git-lfs/blob/master/docs/api/v1/http-v1-batch.md"> |
| * https://github.com/github/git-lfs/blob/master/docs/api/v1/http-v1-batch.md</a> |
| */ |
| public static final String CONTENT_TYPE_GIT_LFS_JSON = "application/vnd.git-lfs+json"; |
| |
| /** |
| * "Arbitrary binary data" as defined in |
| * <a href="https://www.ietf.org/rfc/rfc2046.txt">RFC 2046</a> |
| */ |
| public static final String HDR_APPLICATION_OCTET_STREAM = "application/octet-stream"; |
| } |