66 lines
2.1 KiB
Go
66 lines
2.1 KiB
Go
package ante
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import (
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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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)
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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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// RejectExtensionOptionsDecorator is an AnteDecorator that rejects all extension
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// options which can optionally be included in protobuf transactions. Users that
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// need extension options should create a custom AnteHandler chain that handles
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// needed extension options properly and rejects unknown ones.
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type RejectExtensionOptionsDecorator struct {
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checker ExtensionOptionChecker
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}
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// NewExtensionOptionsDecorator creates a new antehandler 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 NewExtensionOptionsDecorator(checker ExtensionOptionChecker) sdk.AnteDecorator {
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if checker == nil {
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checker = rejectExtensionOption
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}
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return RejectExtensionOptionsDecorator{checker: checker}
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}
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var _ sdk.AnteDecorator = RejectExtensionOptionsDecorator{}
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// AnteHandle implements the AnteDecorator.AnteHandle method
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func (r RejectExtensionOptionsDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, _ bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
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err = checkExtOpts(tx, r.checker)
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if err != nil {
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return ctx, err
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}
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return next(ctx, tx, false)
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}
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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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