Add distributor notification config validation

internal/config/validate.go

@@ -49,6 +49,10 @@ func Validate(cfg Config) error {
 		}
 	}
 
+	if err := validateDistributorNotify(cfg.Notify.Distributor); err != nil {
+		return err
+	}
+
 	if cfg.Scriptorium.Binary == "" {
 		return fmt.Errorf("scriptorium.binary is required")
 	}
@@ -75,6 +79,56 @@ func Validate(cfg Config) error {
 	return nil
 }
 
+func validateDistributorNotify(cfg DistributorNotifyConfig) error {
+	if !cfg.Enabled {
+		return nil
+	}
+
+	parsed, err := url.Parse(cfg.Endpoint)
+	if err != nil || parsed.Scheme == "" || parsed.Host == "" {
+		return fmt.Errorf("notify.distributor.endpoint must be an absolute URL when enabled")
+	}
+	if cfg.TokenEnv == "" {
+		return fmt.Errorf("notify.distributor.token_env is required when enabled")
+	}
+	if !secretNamePattern.MatchString(cfg.TokenEnv) {
+		return fmt.Errorf("notify.distributor.token_env must be a valid environment variable name")
+	}
+	if cfg.Timeout <= 0 {
+		return fmt.Errorf("notify.distributor.timeout must be greater than zero when enabled")
+	}
+	if cfg.FailurePolicy != NotifyFailureError {
+		return fmt.Errorf("notify.distributor.failure_policy must be error when enabled")
+	}
+	if cfg.BundleIDTemplate == "" {
+		return fmt.Errorf("notify.distributor.bundle_id_template is required when enabled")
+	}
+	if err := validateDistributorTemplate("notify.distributor.bundle_id_template", cfg.BundleIDTemplate, distributorTemplateVariables); err != nil {
+		return err
+	}
+	if cfg.IdempotencyKeyTemplate == "" {
+		return fmt.Errorf("notify.distributor.idempotency_key_template is required when enabled")
+	}
+	if err := validateDistributorTemplate("notify.distributor.idempotency_key_template", cfg.IdempotencyKeyTemplate, distributorIdempotencyTemplateVariables); err != nil {
+		return err
+	}
+	if cfg.ReportPathTemplate == "" {
+		return fmt.Errorf("notify.distributor.report_path_template is required when enabled")
+	}
+	values := DistributorTemplateValues{
+		LocationID:      "location",
+		ReportID:        "report",
+		RunID:           "run",
+		ArtifactGroup:   "artifact",
+		BatchOutputName: "report.md",
+	}
+	if _, err := RenderDistributorReportPath(cfg.ReportPathTemplate, values); err != nil {
+		return err
+	}
+
+	return nil
+}
+
 func validatePolicy(name string, policy MissingSourcePolicy) error {
 	switch policy {
 	case MissingSourceError, MissingSourceWarn, MissingSourceNone: