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/*
* 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";
}
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