[Encoder][Node] Add nil checks (Layr-Labs#425)

Co-authored-by: Siddharth More <Siddhi More>

disperser/encoder/server.go

@@ -76,6 +76,15 @@ func (s *Server) popRequest() {
 func (s *Server) handleEncoding(ctx context.Context, req *pb.EncodeBlobRequest) (*pb.EncodeBlobReply, error) {
 	begin := time.Now()
 
+	if len(req.Data) == 0 {
+		return nil, errors.New("handleEncoding: missing data")
+
+	}
+
+	if req.EncodingParams == nil {
+		return nil, errors.New("handleEncoding: missing encoding parameters")
+	}
+
 	// Convert to core EncodingParams
 	var encodingParams = encoding.EncodingParams{
 		ChunkLength: uint64(req.GetEncodingParams().GetChunkLength()),

node/grpc/utils.go

@@ -106,6 +106,12 @@ func ValidatePointsFromBlobHeader(h *pb.BlobHeader) error {
 
 // GetBlobHeaderFromProto constructs a core.BlobHeader from a proto of pb.BlobHeader.
 func GetBlobHeaderFromProto(h *pb.BlobHeader) (*core.BlobHeader, error) {
+
+	if h == nil {
+		return nil, api.NewInvalidArgError("GetBlobHeaderFromProto: blob header is nil")
+
+	}
+
 	commitX := new(fp.Element).SetBytes(h.GetCommitment().GetX())
 	commitY := new(fp.Element).SetBytes(h.GetCommitment().GetY())
 	commitment := &encoding.G1Commitment{

node/node.go

@@ -268,10 +268,11 @@ func (n *Node) ProcessBatch(ctx context.Context, header *core.BatchHeader, blobs
 	log.Debug("Processing batch", "num of blobs", len(blobs))
 
 	if len(blobs) == 0 {
-		return nil, errors.New("the number of blobs must be greater than zero")
+		return nil, errors.New("ProcessBatch: number of blobs must be greater than zero")
 	}
+
 	if len(blobs) != len(rawBlobs) {
-		return nil, errors.New("the number of parsed blobs must be the same as number of blobs from protobuf request")
+		return nil, errors.New("number of parsed blobs must be the same as number of blobs from protobuf request")
 	}
 
 	// Measure num batches received and its size in bytes