Add D&D location validators

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

@@ -0,0 +1,81 @@
+// Package sourcerefs validates location citations against the current source.
+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"
+	locationshape "gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/validate/locations/shape"
+)
+
+const (
+	Key        = "extract/dnd/locations/source_refs"
+	ReasonCode = "invalid_location_source_refs"
+	policy     = "dnd.locations.validator.source_refs.v1"
+)
+
+type Options struct{}
+type Validator struct{}
+
+var _ contracts.TypedValidator[dnd.LocationList] = (*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.LocationList]) (contracts.ValidationResult, error) {
+	if err := locationshape.Validate(req.Value); err != nil {
+		return contracts.ValidationResult{Approved: true}, nil
+	}
+	index := source.NewDocumentIndex(req.Source)
+	issues := make([]string, 0)
+	for locationIndex, location := range req.Value.Locations {
+		for refIndex, ref := range location.SourceRefs {
+			if err := index.ValidateRef(ref); err != nil {
+				issues = append(issues, fmt.Sprintf("locations[%d].source_refs[%d]: %s", locationIndex, refIndex, diagnostics.Truncate(err.Error())))
+			}
+		}
+	}
+	if len(issues) == 0 {
+		return contracts.ValidationResult{Approved: true}, nil
+	}
+	return rejection(diagnostics.Aggregate("invalid location 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.LocationListKind, Spec(), validateOptions, func(request pipeline.BuildRequest) (contracts.TypedValidator[dnd.LocationList], 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 }
+
+func rejection(message string) contracts.ValidationResult {
+	return contracts.ValidationResult{Approved: false, ReasonCode: ReasonCode, Message: message}
+}

internal/modules/dnd/validate/locations/source_refs/validator_test.go

@@ -0,0 +1,63 @@
+package sourcerefs
+
+import (
+	"context"
+	"reflect"
+	"strings"
+	"testing"
+	"unicode/utf8"
+
+	"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"
+)
+
+func TestValidatorRejectsForeignAndOutOfRangeReferencesWithoutMutation(t *testing.T) {
+	value := validLocationList()
+	value.Locations[0].SourceRefs = []source.SourceRef{{SourceID: "foreign", StartUnitID: 1, EndUnitID: 1}, {SourceID: "session", StartUnitID: 9, EndUnitID: 9}}
+	before := value
+	result, err := New(Options{}).Validate(context.Background(), request(validDocument(), value))
+	if err != nil || result.Approved || result.ReasonCode != ReasonCode || !strings.Contains(result.Message, "locations[0].source_refs[0]") {
+		t.Fatalf("Validate() = %#v, %v; want source-reference rejection", result, err)
+	}
+	if len(result.Message) > 4096 || !utf8.ValidString(result.Message) || !reflect.DeepEqual(value, before) {
+		t.Fatalf("Validate() produced unsafe diagnostics or mutated value")
+	}
+}
+
+func TestValidatorApprovesValidReferencesAndDefersMalformedShape(t *testing.T) {
+	result, err := New(Options{}).Validate(context.Background(), request(validDocument(), validLocationList()))
+	if err != nil || !result.Approved {
+		t.Fatalf("valid references = %#v, %v", result, err)
+	}
+	result, err = New(Options{}).Validate(context.Background(), request(nil, dnd.LocationList{Locations: []dnd.Location{{Name: "Missing"}}}))
+	if err != nil || !result.Approved || result.ReasonCode != "" {
+		t.Fatalf("malformed shape = %#v, %v; want deferral", result, err)
+	}
+}
+
+func TestValidatorRegisters(t *testing.T) {
+	registry := pipeline.NewValidatorRegistry()
+	if err := Register(registry); err != nil {
+		t.Fatalf("Register() error = %v", err)
+	}
+	if got, ok := registry.Spec(Key); !ok || got != Spec() || got.ExecutionClass != contracts.ExecutionClassDeterministic {
+		t.Fatalf("registered spec = %#v, ok = %t", got, ok)
+	}
+	if got := New(Options{}).CheckpointFingerprints(); len(got) != 1 || got[0].Value != policy {
+		t.Fatalf("fingerprints = %#v", got)
+	}
+}
+
+func request(doc *source.SourceDocument, value dnd.LocationList) contracts.TypedValidationRequest[dnd.LocationList] {
+	return contracts.TypedValidationRequest[dnd.LocationList]{Source: doc, Value: value}
+}
+
+func validDocument() *source.SourceDocument {
+	return &source.SourceDocument{ID: "session", Kind: "transcript", Format: "application/json", Digest: "sha256:session", Units: []source.SourceUnit{{ID: 1, Kind: "message", Text: "Moon Gate opens."}}}
+}
+
+func validLocationList() dnd.LocationList {
+	return dnd.LocationList{Locations: []dnd.Location{{ID: "candidate", Name: "Moon Gate", SourceRefs: []source.SourceRef{{SourceID: "session", StartUnitID: 1, EndUnitID: 1}}}}}
+}