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min_commission.go
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min_commission.go
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package ante
import (
"github.com/cosmos/cosmos-sdk/codec"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
"github.com/cosmos/cosmos-sdk/x/authz"
stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"
)
type MinCommissionDecorator struct {
codec codec.BinaryCodec
}
func NewMinCommissionDecorator(codec codec.BinaryCodec) MinCommissionDecorator {
return MinCommissionDecorator{
codec,
}
}
func checkCommission(m sdk.Msg) error {
switch msg := m.(type) {
case *stakingtypes.MsgCreateValidator:
c := msg.Commission
if c.Rate.LT(sdk.NewDecWithPrec(5, 2)) {
return sdkerrors.Wrap(sdkerrors.ErrUnauthorized, "commission can not be lower than 5%")
}
case *stakingtypes.MsgEditValidator:
// if commission rate is nil, it means only other fields are being update and we must skip this validation
if msg.CommissionRate == nil {
return nil
}
if msg.CommissionRate.LT(sdk.NewDecWithPrec(5, 2)) {
return sdkerrors.Wrap(sdkerrors.ErrUnauthorized, "commission can not be lower than 5%")
}
default:
return nil
}
return nil
}
func (dec MinCommissionDecorator) Validate(m sdk.Msg) error {
err := checkCommission(m)
if err != nil {
return err
}
if msg, ok := m.(*authz.MsgExec); ok {
for _, v := range msg.Msgs {
var wrappedMsg sdk.Msg
err := dec.codec.UnpackAny(v, &wrappedMsg)
if err != nil {
return sdkerrors.Wrapf(sdkerrors.ErrUnauthorized, "error decoding authz messages")
}
err = checkCommission(wrappedMsg)
if err != nil {
return err
}
}
}
return nil
}
func (dec MinCommissionDecorator) AnteHandle(
ctx sdk.Context, tx sdk.Tx,
simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
msgs := tx.GetMsgs()
for _, m := range msgs {
err := dec.Validate(m)
if err != nil {
return ctx, err
}
}
return next(ctx, tx, simulate)
}