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min_deposit.go
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min_deposit.go
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package ante
import (
"fmt"
"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"
)
type MinDepositDecorator struct {
codec codec.BinaryCodec
govKeeper govkeeper.Keeper
}
func NewMinDepositDecorator(codec codec.BinaryCodec, gk govkeeper.Keeper) MinDepositDecorator {
return MinDepositDecorator{
codec,
gk,
}
}
func (dec MinDepositDecorator) checkDeposit(ctx sdk.Context, m sdk.Msg) error {
switch msg := m.(type) {
case *govtypes.MsgSubmitProposal:
params := dec.govKeeper.GetDepositParams(ctx)
if len(params.MinDeposit) > 0 {
minDeposit := params.MinDeposit[0]
// 20% of the min deposit
minDepositRatio := sdk.NewDecWithPrec(20, 2)
minDepositAmount := sdk.NewDecFromInt(minDeposit.Amount).Mul(minDepositRatio).RoundInt()
initialDeposit := msg.GetInitialDeposit()
if initialDeposit.AmountOf(minDeposit.Denom).LT(minDepositAmount) {
return sdkerrors.Wrap(sdkerrors.ErrUnauthorized, fmt.Sprintf("min deposit cannot be lower than %s %s", minDepositAmount.String(), minDeposit.GetDenom()))
}
}
default:
return nil
}
return nil
}
func (dec MinDepositDecorator) Validate(ctx sdk.Context, m sdk.Msg) error {
err := dec.checkDeposit(ctx, 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 = dec.checkDeposit(ctx, wrappedMsg)
if err != nil {
return err
}
}
}
return nil
}
func (dec MinDepositDecorator) 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(ctx, m)
if err != nil {
return ctx, err
}
}
return next(ctx, tx, simulate)
}