only allow certain denoms for auctions

x/colinearcore/auctionconfig/config.go

@@ -1,5 +1,9 @@
 package auctionconfig
 
+// Allowed Denoms
+// note: as a slice, values can't be immutable, but length can be
+var AllowedAuctionDenoms = [...]string{"uusdc", "uclr"}
+
 const (
 	// Times
 	AuctionTime = 10 // 10 blocks = ~10-30 seconds

x/colinearcore/keeper/msg_server_new_auction.go

@@ -24,6 +24,15 @@ func (k msgServer) NewAuction(goCtx context.Context, msg *types.MsgNewAuction) (
 
 	auctionLen := msg.LeaseEnd - uint64(ctx.BlockTime().Unix())
 
+	// check that submitted denom is allowed
+	for _, denom := range auctionconfig.AllowedAuctionDenoms {
+		if msg.Denom == denom {
+			goto found
+		}
+	}
+	return nil, fmt.Errorf("denom %s is not allowed; must be in %v", msg.Denom, auctionconfig.AllowedAuctionDenoms)
+found:
+
 	if auctionLen < auctionconfig.MinLeasePeriod {
 		return nil, fmt.Errorf(
 			"Auction length %d is below min lease period of %d",