/
gov_filter.go
91 lines (77 loc) · 2.47 KB
/
gov_filter.go
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package decorators
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"
govkeeper "github.com/cosmos/cosmos-sdk/x/gov/keeper"
govtypes "github.com/cosmos/cosmos-sdk/x/gov/types"
)
var MiniumInitialDepositRate = sdk.NewDecWithPrec(20, 2)
type GovPreventSpamDecorator struct {
govKeeper govkeeper.Keeper
cdc codec.BinaryCodec
}
func NewGovPreventSpamDecorator(cdc codec.BinaryCodec, govKeeper govkeeper.Keeper) GovPreventSpamDecorator {
return GovPreventSpamDecorator{
govKeeper: govKeeper,
cdc: cdc,
}
}
func (gpsd GovPreventSpamDecorator) AnteHandle(
ctx sdk.Context, tx sdk.Tx,
simulate bool, next sdk.AnteHandler,
) (newCtx sdk.Context, err error) {
if DefaultIsAppSimulation {
return next(ctx, tx, simulate)
}
msgs := tx.GetMsgs()
err = gpsd.checkSpamSubmitProposalMsg(ctx, msgs)
if err != nil {
return ctx, err
}
return next(ctx, tx, simulate)
}
func (gpsd GovPreventSpamDecorator) checkSpamSubmitProposalMsg(ctx sdk.Context, msgs []sdk.Msg) error {
validMsg := func(m sdk.Msg) error {
if msg, ok := m.(*govtypes.MsgSubmitProposal); ok {
// prevent spam gov msg
depositParams := gpsd.govKeeper.GetDepositParams(ctx)
miniumInitialDeposit := gpsd.calcMiniumInitialDeposit(depositParams.MinDeposit)
if msg.InitialDeposit.IsAllLT(miniumInitialDeposit) {
return sdkerrors.Wrapf(sdkerrors.ErrUnauthorized, "not enough initial deposit. required: %v", miniumInitialDeposit)
}
}
return nil
}
// Check every msg in the tx, if it's a MsgExec, check the inner msgs.
// If it's a MsgSubmitProposal, check the initial deposit is enough.
for _, m := range msgs {
var innerMsg sdk.Msg
if msg, ok := m.(*authz.MsgExec); ok {
for _, v := range msg.Msgs {
err := gpsd.cdc.UnpackAny(v, &innerMsg)
if err != nil {
return sdkerrors.Wrapf(sdkerrors.ErrUnauthorized, "cannot unmarshal authz exec msgs")
}
err = validMsg(innerMsg)
if err != nil {
return err
}
}
} else {
err := validMsg(m)
if err != nil {
return err
}
}
}
return nil
}
func (gpsd GovPreventSpamDecorator) calcMiniumInitialDeposit(minDeposit sdk.Coins) (miniumInitialDeposit sdk.Coins) {
for _, coin := range minDeposit {
miniumInitialCoin := MiniumInitialDepositRate.MulInt(coin.Amount).RoundInt()
miniumInitialDeposit = miniumInitialDeposit.Add(sdk.NewCoin(coin.Denom, miniumInitialCoin))
}
return
}