SSH signing: make OpenSSH pattern matching public

SSH signing needs the same pattern matching algorithm as is used for
host matching in host entries in ~/.ssh/config. So make that pattern
matching available via a static method.

Change-Id: Ia26f23666f323f44ce66f769fbcd6c85965eb219
Signed-off-by: Thomas Wolf <twolf@apache.org>

1 files changed, 30 insertions, 13 deletions

diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/transport/ssh/OpenSshConfigFile.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/transport/ssh/OpenSshConfigFile.java
index 3e75a9dde3..542d6e94f3 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/transport/ssh/OpenSshConfigFile.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/transport/ssh/OpenSshConfigFile.java
@@ -427,7 +427,35 @@ public class OpenSshConfigFile implements SshConfigStore {
 		return value;
 	}
 
-	private static boolean patternMatchesHost(String pattern, String name) {
+	/**
+	 * Tells whether a given {@code name} matches the given list of patterns,
+	 * accounting for negative matches.
+	 *
+	 * @param patterns
+	 *            to test {@code name} against; any pattern starting with an
+	 *            exclamation mark is a negative pattern
+	 * @param name
+	 *            to test
+	 * @return {@code true} if the {@code name} matches at least one of the
+	 *         non-negative patterns and none of the negative patterns,
+	 *         {@code false} otherwise
+	 * @since 7.1
+	 */
+	public static boolean patternMatch(Iterable<String> patterns, String name) {
+		boolean doesMatch = false;
+		for (String pattern : patterns) {
+			if (pattern.startsWith("!")) { //$NON-NLS-1$
+				if (patternMatches(pattern.substring(1), name)) {
+					return false;
+				}
+			} else if (!doesMatch && patternMatches(pattern, name)) {
+				doesMatch = true;
+			}
+		}
+		return doesMatch;
+	}
+
+	private static boolean patternMatches(String pattern, String name) {
 		if (pattern.indexOf('*') >= 0 || pattern.indexOf('?') >= 0) {
 			final FileNameMatcher fn;
 			try {
@@ -680,18 +708,7 @@ public class OpenSshConfigFile implements SshConfigStore {
 		}
 
 		boolean matches(String hostName) {
-			boolean doesMatch = false;
-			for (String pattern : patterns) {
-				if (pattern.startsWith("!")) { //$NON-NLS-1$
-					if (patternMatchesHost(pattern.substring(1), hostName)) {
-						return false;
-					}
-				} else if (!doesMatch
-						&& patternMatchesHost(pattern, hostName)) {
-					doesMatch = true;
-				}
-			}
-			return doesMatch;
+			return patternMatch(patterns, hostName);
 		}
 
 		private static String toKey(String key) {