fix: resolve lint issues in handlers and middleware

internal/handlers/repo_url_validation.go

@@ -20,6 +20,16 @@ var (
 // Only the "git" user is allowed, as that is the standard for SSH deploy keys.
 var scpLikeRepoRe = regexp.MustCompile(`^git@[a-zA-Z0-9._-]+:.+$`)
 
+// allowedRepoSchemes lists the URL schemes accepted for repository URLs.
+//
+//nolint:gochecknoglobals // package-level constant map parsed once
+var allowedRepoSchemes = map[string]bool{
+	"https": true,
+	"http":  true,
+	"ssh":   true,
+	"git":   true,
+}
+
 // validateRepoURL checks that the given repository URL is valid and uses an allowed scheme.
 func validateRepoURL(repoURL string) error {
 	if strings.TrimSpace(repoURL) == "" {
@@ -41,17 +51,17 @@ func validateRepoURL(repoURL string) error {
 		return errRepoURLScheme
 	}
 
-	// Parse as standard URL
+	return validateParsedRepoURL(repoURL)
+}
+
+// validateParsedRepoURL validates a standard URL-format repository URL.
+func validateParsedRepoURL(repoURL string) error {
 	parsed, err := url.Parse(repoURL)
 	if err != nil {
 		return errRepoURLInvalid
 	}
 
-	// Must have a recognized scheme
-	switch strings.ToLower(parsed.Scheme) {
-	case "https", "http", "ssh", "git":
-		// OK
-	default:
+	if !allowedRepoSchemes[strings.ToLower(parsed.Scheme)] {
 		return errRepoURLInvalid
 	}