1 files changed, 91 insertions, 0 deletions
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/util/SignatureUtils.java b/org.eclipse.jgit/src/org/eclipse/jgit/util/SignatureUtils.java
new file mode 100644
index 0000000000..e3e3e04fd9
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+++ b/org.eclipse.jgit/src/org/eclipse/jgit/util/SignatureUtils.java
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2021, Thomas Wolf <thomas.wolf@paranor.ch> 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.util;
+
+import java.text.MessageFormat;
+import java.util.Locale;
+
+import org.eclipse.jgit.internal.JGitText;
+import org.eclipse.jgit.lib.SignatureVerifier.SignatureVerification;
+import org.eclipse.jgit.lib.SignatureVerifier.TrustLevel;
+import org.eclipse.jgit.lib.PersonIdent;
+
+/**
+ * Utilities for signature verification.
+ *
+ * @since 5.11
+ */
+public final class SignatureUtils {
+
+	private SignatureUtils() {
+		// No instantiation
+	}
+
+	/**
+	 * Writes information about a signature verification to a string.
+	 *
+	 * @param verification
+	 *            to show
+	 * @param creator
+	 *            of the object verified; used for time zone information
+	 * @param formatter
+	 *            to use for dates
+	 * @return a textual representation of the {@link SignatureVerification},
+	 *         using LF as line separator
+	 *
+	 * @since 7.0
+	 */
+	public static String toString(SignatureVerification verification,
+			PersonIdent creator, GitDateFormatter formatter) {
+		StringBuilder result = new StringBuilder();
+		if (verification.creationDate() != null) {
+			// Use the creator's timezone for the signature date
+			PersonIdent dateId = new PersonIdent(creator,
+					verification.creationDate().toInstant());
+			result.append(
+					MessageFormat.format(JGitText.get().verifySignatureMade,
+							formatter.formatDate(dateId)));
+			result.append('\n');
+		}
+		result.append(MessageFormat.format(
+				JGitText.get().verifySignatureKey,
+				verification.keyFingerprint().toUpperCase(Locale.ROOT)));
+		result.append('\n');
+		if (!StringUtils.isEmptyOrNull(verification.signer())) {
+			result.append(
+					MessageFormat.format(JGitText.get().verifySignatureIssuer,
+							verification.signer()));
+			result.append('\n');
+		}
+		String msg;
+		if (verification.verified()) {
+			if (verification.expired()) {
+				msg = JGitText.get().verifySignatureExpired;
+			} else {
+				msg = JGitText.get().verifySignatureGood;
+			}
+		} else {
+			msg = JGitText.get().verifySignatureBad;
+		}
+		result.append(MessageFormat.format(msg, verification.keyUser()));
+		if (!TrustLevel.UNKNOWN.equals(verification.trustLevel())) {
+			result.append(' ' + MessageFormat
+					.format(JGitText.get().verifySignatureTrust, verification
+							.trustLevel().name().toLowerCase(Locale.ROOT)));
+		}
+		result.append('\n');
+		msg = verification.message();
+		if (!StringUtils.isEmptyOrNull(msg)) {
+			result.append(msg);
+			result.append('\n');
+		}
+		return result.toString();
+	}
+}