feat: Add x/authz SendAuthorization AllowList

CHANGELOG.md

@@ -39,6 +39,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Features
 
+* (x/authz) [#12648](https://github.com/cosmos/cosmos-sdk/pull/12648) Add an allow list, an optional list of addresses allowed to receive bank assests via authz MsgSend grant.
 * (cli) [#12028](https://github.com/cosmos/cosmos-sdk/pull/12028) Add the `tendermint key-migrate` to perform Tendermint v0.35 DB key migration.
 * (query) [#12253](https://github.com/cosmos/cosmos-sdk/pull/12253) Add `GenericFilteredPaginate` to the `query` package to improve UX.
 * (telemetry) [#12405](https://github.com/cosmos/cosmos-sdk/pull/12405) Add _query_ calls metric to telemetry.
@@ -73,6 +74,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### API Breaking Changes
 
+* (x/authz) [#12648](https://github.com/cosmos/cosmos-sdk/pull/12648) Add an allow list, an optional list of addresses allowed to receive bank assests via authz MsgSend grant.
 * (x/bank) [\#12593](https://github.com/cosmos/cosmos-sdk/pull/12593) Add `SpendableCoin` method to `BaseViewKeeper`
 * (x/slashing) [#12581](https://github.com/cosmos/cosmos-sdk/pull/12581) Remove `x/slashing` legacy querier.
 * (types) [\#12355](https://github.com/cosmos/cosmos-sdk/pull/12355) Remove the compile-time `types.DBbackend` variable. Removes usage of the same in server/util.go

proto/cosmos/bank/v1beta1/authz.proto

@@ -16,4 +16,8 @@ message SendAuthorization {
 
   repeated cosmos.base.v1beta1.Coin spend_limit = 1
       [(gogoproto.nullable) = false, (gogoproto.castrepeated) = "github.com/cosmos/cosmos-sdk/types.Coins"];
+
+  // allow_list specifies the list of addresses to whom the grantee can send tokens on behalf of granter's 
+  // account.
+  repeated string allow_list = 2;
 }

types/address.go

@@ -677,3 +677,29 @@ func cacheBech32Addr(prefix string, addr []byte, cache *simplelru.LRU, cacheKey
 	cache.Add(cacheKey, bech32Addr)
 	return bech32Addr
 }
+
+// Bech32toValAddresses returns []ValAddress from a list of Bech32 string addresses.
+func Bech32toValAddresses(validators []string) ([]ValAddress, error) {
+	vals := make([]ValAddress, len(validators))
+	for i, validator := range validators {
+		addr, err := ValAddressFromBech32(validator)
+		if err != nil {
+			return nil, err
+		}
+		vals[i] = addr
+	}
+	return vals, nil
+}
+
+// Bech32toAccAddresses returns []AccAddress from a list of Bech32 string addresses.
+func Bech32toAccAddresses(accAddrs []string) ([]AccAddress, error) {
+	addrs := make([]AccAddress, len(accAddrs))
+	for i, addr := range accAddrs {
+		accAddr, err := AccAddressFromBech32(addr)
+		if err != nil {
+			return nil, err
+		}
+		addrs[i] = accAddr
+	}
+	return addrs, nil
+}