Taken into account PR review comments

Author: thboileau

org.restlet.java/org.restlet/src/main/java/org/restlet/data/Reference.java

@@ -2879,17 +2879,19 @@ private void validateAuthority(String authority) {
 			}
 		} else if (ipV6StartIndex == 0) {
 			int ipV6EndIndex = authority.indexOf(']');
+
 			if (ipV6EndIndex == -1) {
 				throw new IllegalArgumentException("Invalid IPv6 address format: no closing bracket");
-			} else {
-				validateIpV6(authority.substring(0, ipV6EndIndex + 1));
-				if (ipV6EndIndex + 1 < authority.length()) {
-					if (authority.charAt(ipV6EndIndex + 1) == ':') {
-						validateHostPort(authority.substring(ipV6EndIndex + 2));
-					} else {
-						throw new IllegalArgumentException(
-								"Invalid authority format: unexpected character after closing bracket");
-					}
+			}
+
+			validateIpV6(authority.substring(1, ipV6EndIndex)); // trim brackets
+
+			if (ipV6EndIndex + 1 < authority.length()) {
+				if (authority.charAt(ipV6EndIndex + 1) == ':') {
+					validateHostPort(authority.substring(ipV6EndIndex + 2));
+				} else {
+					throw new IllegalArgumentException(
+							"Invalid authority format: unexpected character after closing bracket");
 				}
 			}
 		} else {
@@ -2923,8 +2925,6 @@ private void validateIpV6(String ipV6) {
 			throw new IllegalArgumentException("Invalid IPv6 address");
 		}
 
-		ipV6 = trimIpV6Brackets(ipV6);
-
 		// Check for double colon compression (only one allowed)
 		int doubleColonCount = 0;
 		int idx = ipV6.indexOf("::");
@@ -2967,16 +2967,6 @@ private void validateIpV6Part(final String part, final int doubleColonCount) {
 		}
 	}
 
-	private String trimIpV6Brackets(String ipV6) {
-		if (ipV6.startsWith("[")) {
-			ipV6 = ipV6.substring(1);
-		}
-		if (ipV6.endsWith("]")) {
-			ipV6 = ipV6.substring(0, ipV6.length() - 1);
-		}
-		return ipV6;
-	}
-
 	/**
      * Validate a scheme according to RFC 3986.
      * 

org.restlet.java/org.restlet/src/test/java/org/restlet/data/ReferenceTestCase.java

@@ -681,6 +681,7 @@ class TestFailures {
                 "https://[normal.com@]vulndetector.com/",
                 "https://normal.com[user@vulndetector].com/",
                 "https://normal.com[@]vulndetector.com/",
+                "https://user:pwd@a[1:2:3:4]/",
                 "https://[1:2:3:4:5:6:7:8:9]",
                 "https://[1::1::1]",
                 "https://[1:2:3:]",