fix dir name handling in Windows for IPv6 addr

Author: koba1t

api/internal/localizer/util.go

@@ -218,5 +218,10 @@ func parseHost(repoSpec *git.RepoSpec) (string, error) {
 		return "", errors.Wrap(err)
 	}
 	// strip scheme, userinfo, port, and any trailing slashes.
-	return u.Hostname(), nil
+	hostname := u.Hostname()
+	// On Windows, colons are invalid in file paths. Replace them with hyphens
+	// to make IPv6 addresses filesystem-safe.
+	// This affects IPv6 addresses like [2001:4860:4860::8888].
+	hostname = strings.ReplaceAll(hostname, ":", "-")
+	return hostname, nil
 }

api/internal/localizer/util_test.go

@@ -228,7 +228,7 @@ func TestLocRootPath_URLComponents(t *testing.T) {
 		},
 		"IPv6": {
 			urlf: "https://[2001:4860:4860::8888]/org/repo//%s?ref=value",
-			path: simpleJoin(t, "2001:4860:4860::8888", "org", "repo", "value"),
+			path: simpleJoin(t, "2001-4860-4860--8888", "org", "repo", "value"),
 		},
 		"port": {
 			urlf: "https://localhost.com:8080/org/repo//%s?ref=value",