87 lines
2.6 KiB
Go
87 lines
2.6 KiB
Go
package middleware
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import (
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"context"
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codectypes "github.com/cosmos/cosmos-sdk/codec/types"
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sdk "github.com/cosmos/cosmos-sdk/types"
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sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
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"github.com/cosmos/cosmos-sdk/types/tx"
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)
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type HasExtensionOptionsTx interface {
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GetExtensionOptions() []*codectypes.Any
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GetNonCriticalExtensionOptions() []*codectypes.Any
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}
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// ExtensionOptionChecker is a function that returns true if the extension option is accepted.
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type ExtensionOptionChecker func(*codectypes.Any) bool
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// rejectExtensionOption is the default extension check that reject all tx
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// extensions.
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func rejectExtensionOption(*codectypes.Any) bool {
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return false
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}
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type rejectExtensionOptionsTxHandler struct {
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next tx.Handler
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checker ExtensionOptionChecker
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}
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// NewExtensionOptionsMiddleware creates a new middleware that rejects all extension
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// options which can optionally be included in protobuf transactions that don't pass the checker.
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// Users that need extension options should pass a custom checker that returns true for the
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// needed extension options.
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func NewExtensionOptionsMiddleware(checker ExtensionOptionChecker) tx.Middleware {
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if checker == nil {
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checker = rejectExtensionOption
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}
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return func(txh tx.Handler) tx.Handler {
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return rejectExtensionOptionsTxHandler{
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next: txh,
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checker: checker,
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}
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}
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}
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var _ tx.Handler = rejectExtensionOptionsTxHandler{}
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func checkExtOpts(tx sdk.Tx, checker ExtensionOptionChecker) error {
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if hasExtOptsTx, ok := tx.(HasExtensionOptionsTx); ok {
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for _, opt := range hasExtOptsTx.GetExtensionOptions() {
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if !checker(opt) {
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return sdkerrors.ErrUnknownExtensionOptions
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}
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}
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}
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return nil
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}
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// CheckTx implements tx.Handler.CheckTx.
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func (txh rejectExtensionOptionsTxHandler) CheckTx(ctx context.Context, req tx.Request, checkReq tx.RequestCheckTx) (tx.Response, tx.ResponseCheckTx, error) {
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if err := checkExtOpts(req.Tx, txh.checker); err != nil {
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return tx.Response{}, tx.ResponseCheckTx{}, err
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}
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return txh.next.CheckTx(ctx, req, checkReq)
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}
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// DeliverTx implements tx.Handler.DeliverTx.
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func (txh rejectExtensionOptionsTxHandler) DeliverTx(ctx context.Context, req tx.Request) (tx.Response, error) {
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if err := checkExtOpts(req.Tx, txh.checker); err != nil {
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return tx.Response{}, err
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}
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return txh.next.DeliverTx(ctx, req)
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}
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// SimulateTx implements tx.Handler.SimulateTx method.
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func (txh rejectExtensionOptionsTxHandler) SimulateTx(ctx context.Context, req tx.Request) (tx.Response, error) {
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if err := checkExtOpts(req.Tx, txh.checker); err != nil {
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return tx.Response{}, err
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}
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return txh.next.SimulateTx(ctx, req)
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}
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