Add D&D scene description validation

internal/modules/dnd/validate/scenedescriptions/source_refs/validator.go

@@ -0,0 +1,90 @@
+// Package sourcerefs validates D&D scene-description source identity.
+package sourcerefs
+
+import (
+	"context"
+	"fmt"
+
+	"gitea.maximumdirect.net/eric/notarius/internal/core/source"
+	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
+	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared/diagnostics"
+	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/validate/scenedescriptions/shape"
+)
+
+const (
+	Key        = "extract/dnd/scene-descriptions/source_refs"
+	ReasonCode = "invalid_scene_description_source_refs"
+	policy     = "dnd.scene_descriptions.validator.source_refs.v1"
+)
+
+type Options struct{}
+type Validator struct{}
+
+var _ contracts.TypedValidator[dnd.SceneDescriptionList] = (*Validator)(nil)
+var _ pipeline.CheckpointFingerprintProvider = (*Validator)(nil)
+
+func New(Options) *Validator      { return &Validator{} }
+func (v *Validator) Name() string { return Key }
+func (v *Validator) ExecutionClass() contracts.ExecutionClass {
+	return contracts.ExecutionClassDeterministic
+}
+func (v *Validator) CheckpointFingerprints() []pipeline.CheckpointFingerprint {
+	return []pipeline.CheckpointFingerprint{{Name: "policy", Value: policy}}
+}
+
+func (v *Validator) Validate(_ context.Context, req contracts.TypedValidationRequest[dnd.SceneDescriptionList]) (contracts.ValidationResult, error) {
+	if shape.ValidateForStage(req.Value, req.Stage) != nil {
+		return contracts.ValidationResult{Approved: true}, nil
+	}
+	issues := make([]string, 0)
+	if req.Stage == string(pipeline.StageExtract) && req.Chunk == nil {
+		issues = append(issues, "current extraction chunk must not be nil")
+	}
+	for index, scene := range req.Value.Scenes {
+		prefix := fmt.Sprintf("scenes[%d]", index)
+		if err := source.ValidateRef(req.Source, scene.SourceRef); err != nil {
+			issues = append(issues, prefix+".source_ref: "+diagnostics.Truncate(err.Error()))
+			continue
+		}
+		if req.Stage == string(pipeline.StageExtract) && req.Chunk != nil {
+			if scene.ID != req.Chunk.ID {
+				issues = append(issues, prefix+".id must equal the current extraction chunk ID")
+			}
+			if scene.SourceRef != req.Chunk.Ref {
+				issues = append(issues, prefix+".source_ref must equal the current extraction chunk range")
+			}
+		}
+	}
+	if len(issues) == 0 {
+		return contracts.ValidationResult{Approved: true}, nil
+	}
+	return contracts.ValidationResult{
+		Approved: false, ReasonCode: ReasonCode,
+		Message: diagnostics.Aggregate("invalid scene description source references", issues),
+	}, nil
+}
+
+func Spec() pipeline.ValidatorSpec {
+	return pipeline.ValidatorSpec{Key: Key, ExecutionClass: contracts.ExecutionClassDeterministic}
+}
+
+func Register(registry *pipeline.ValidatorRegistry) error {
+	return pipeline.RegisterTypedValidatorBuilder(registry, dnd.SceneDescriptionListKind, Spec(), validateOptions, func(request pipeline.BuildRequest) (contracts.TypedValidator[dnd.SceneDescriptionList], error) {
+		options, err := DecodeOptions(request.Options)
+		if err != nil {
+			return nil, err
+		}
+		return New(options), nil
+	})
+}
+
+func DecodeOptions(options map[string]any) (Options, error) {
+	if err := pipeline.RejectUnknownOptions(options); err != nil {
+		return Options{}, err
+	}
+	return Options{}, nil
+}
+
+func validateOptions(options map[string]any) error { _, err := DecodeOptions(options); return err }