Add destination link metadata

internal/state/validate.go

@@ -2,6 +2,7 @@ package state
 
 import (
 	"fmt"
+	"net/url"
 
 	"gitea.maximumdirect.net/eric/distributor/internal/bundle"
 	"gitea.maximumdirect.net/eric/distributor/internal/storage"
@@ -28,6 +29,11 @@ func Validate(s DistributorState) error {
 	if err := validateEmbeddedManifest(s.Source.Manifest); err != nil {
 		return fmt.Errorf("state source.manifest: %w", err)
 	}
+	if s.Links != nil && s.Links.PrimaryURL != "" {
+		if err := validateStateURL(s.Links.PrimaryURL); err != nil {
+			return fmt.Errorf("state links.primary_url: %w", err)
+		}
+	}
 	if s.Outputs == nil {
 		return fmt.Errorf("state outputs is required")
 	}
@@ -63,6 +69,11 @@ func validateOutput(index int, output OutputFile) error {
 	if output.Kind == OutputKindGenerated && output.Transform == "" {
 		return fmt.Errorf("state outputs[%d].transform is required for generated output", index)
 	}
+	if output.URL != "" {
+		if err := validateStateURL(output.URL); err != nil {
+			return fmt.Errorf("state outputs[%d].url: %w", index, err)
+		}
+	}
 	if err := bundle.ValidateDigest(output.SHA256); err != nil {
 		return fmt.Errorf("state outputs[%d].sha256: %w", index, err)
 	}
@@ -71,3 +82,23 @@ func validateOutput(index int, output OutputFile) error {
 	}
 	return nil
 }
+
+func validateStateURL(value string) error {
+	parsed, err := url.Parse(value)
+	if err != nil {
+		return err
+	}
+	if parsed.Scheme != "http" && parsed.Scheme != "https" {
+		return fmt.Errorf("must use http or https")
+	}
+	if parsed.Host == "" {
+		return fmt.Errorf("must include a host")
+	}
+	if parsed.RawQuery != "" {
+		return fmt.Errorf("must not include a query string")
+	}
+	if parsed.Fragment != "" {
+		return fmt.Errorf("must not include a fragment")
+	}
+	return nil
+}