Add code for post validation to activation malfeasance handler

activation/malfeasance2_handler.go

@@ -19,6 +19,7 @@ type MalfeasanceHandlerV2 struct {
 	cdb        *datastore.CachedDB
 	tortoise   system.Tortoise
 	edVerifier *signing.EdVerifier
+	validator  nipostValidatorV2
 }
 
 func NewMalfeasanceHandlerV2(
@@ -28,6 +29,7 @@ func NewMalfeasanceHandlerV2(
 	cdb *datastore.CachedDB,
 	tortoise system.Tortoise,
 	edVerifier *signing.EdVerifier,
+	validator nipostValidatorV2,
 ) *MalfeasanceHandlerV2 {
 	return &MalfeasanceHandlerV2{
 		syncer:     syncer,
@@ -36,9 +38,22 @@ func NewMalfeasanceHandlerV2(
 		cdb:        cdb,
 		tortoise:   tortoise,
 		edVerifier: edVerifier,
+		validator:  validator,
 	}
 }
 
+func (mh *MalfeasanceHandlerV2) PostV2Idx(
+	ctx context.Context,
+	nodeId types.NodeID,
+	commitmentAtxId types.ATXID,
+	post *types.Post,
+	challenge []byte,
+	numUnits uint32,
+	idx int,
+) error {
+	return mh.validator.PostV2(ctx, nodeId, commitmentAtxId, post, challenge, numUnits, PostIndex(idx))
+}
+
 // TODO(mafa): call this validate in the handler for publish/gossip.
 // TODO(mafa): extend this validate to return nil if `peer` == self.
 func (mh *MalfeasanceHandlerV2) Validate(ctx context.Context, data []byte) ([]types.NodeID, error) {

activation/validation.go

@@ -41,6 +41,7 @@ func (e *ErrAtxNotFound) Is(target error) bool {
 }
 
 type validatorOptions struct {
+	postIdx        *int
 	postSubsetSeed []byte
 	prioritized    bool
 }
@@ -53,6 +54,14 @@ func PostSubset(seed []byte) validatorOption {
 	}
 }
 
+// PostIndex configures the validator to validate only the POST index at the given `idx`.
+func PostIndex(idx int) validatorOption {
+	return func(o *validatorOptions) {
+		o.postIdx = new(int)
+		*o.postIdx = idx
+	}
+}
+
 func PrioritizeCall() validatorOption {
 	return func(o *validatorOptions) {
 		o.prioritized = true
@@ -204,6 +213,9 @@ func (v *Validator) Post(
 	}
 
 	verifyOpts := []verifying.OptionFunc{verifying.WithLabelScryptParams(v.scrypt)}
+	if options.postIdx != nil {
+		verifyOpts = append(verifyOpts, verifying.SelectedIndex(*options.postIdx))
+	}
 	if options.postSubsetSeed != nil {
 		verifyOpts = append(verifyOpts, verifying.Subset(v.cfg.K3, options.postSubsetSeed))
 	}