PushCertificate: Add toTextWithSignature() method

Change-Id: Ic0129373cc0c0321ffa43dc11a658d4f891ec2c2

org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/PushCertificateParserTest.java

@@ -215,6 +215,7 @@ public class PushCertificateParserTest {
 				cmd.getNewId().name());
 
 		assertEquals(concatPacketLines(INPUT, 0, 6), cert.toText());
+		assertEquals(concatPacketLines(INPUT, 0, 17), cert.toTextWithSignature());
 
 		String signature = concatPacketLines(INPUT, 6, 17);
 		assertTrue(signature.startsWith(PushCertificateParser.BEGIN_SIGNATURE));

org.eclipse.jgit/src/org/eclipse/jgit/transport/PushCertificate.java

@@ -203,6 +203,19 @@ public class PushCertificate {
 	 * @since 4.1
 	 */
 	public String toText() {
+		return toStringBuilder().toString();
+	}
+
+	/**
+	 * @return original text payload plus signature; the final output will be
+	 *     valid as input to {@link PushCertificateParser#fromString(String)}.
+	 * @since 4.1
+	 */
+	public String toTextWithSignature() {
+		return toStringBuilder().append(signature).toString();
+	}
+
+	private StringBuilder toStringBuilder() {
 		StringBuilder sb = new StringBuilder()
 				.append(VERSION).append(' ').append(version).append('\n')
 				.append(PUSHER).append(' ').append(getPusher())
@@ -215,7 +228,7 @@ public class PushCertificate {
 				.append(' ').append(cmd.getNewId().name())
 				.append(' ').append(cmd.getRefName()).append('\n');
 		}
-		return sb.toString();
+		return sb;
 	}
 
 	@Override
@@ -256,6 +269,6 @@ public class PushCertificate {
 	@Override
 	public String toString() {
 		return getClass().getSimpleName() + '['
-				 + toText() + signature + ']';
+				 + toTextWithSignature() + ']';
 	}
 }