1 files changed, 128 insertions, 0 deletions
diff --git a/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/lib/Constants.java b/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/lib/Constants.java
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+++ b/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/lib/Constants.java
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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/";
+
+	/**
+	 * Config file name for lfs specific configuration
+	 *
+	 * @since 6.1
+	 */
+	public static final String DOT_LFS_CONFIG = ".lfsconfig";
+
+	/**
+	 * 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";
+}