ACP-77: Implement Warp message signing

RELEASES.md

@@ -2,6 +2,10 @@
 
 ## Pending Release
 
+### APIs
+
+- Added `platform.getSubnetOnlyValidator`
+
 ### Configs
 
 - Added P-chain configs

network/p2p/acp118/handler.go

@@ -18,6 +18,8 @@ import (
 	"github.com/ava-labs/avalanchego/vms/platformvm/warp"
 )
 
+const HandlerID = p2p.SignatureRequestHandlerID
+
 var _ p2p.Handler = (*Handler)(nil)
 
 // Verifier verifies that a warp message should be signed

proto/platformvm/platformvm.proto

@@ -0,0 +1,24 @@
+syntax = "proto3";
+
+package platformvm;
+
+option go_package = "github.com/ava-labs/avalanchego/proto/pb/platformvm";
+
+message SubnetValidatorRegistrationJustification {
+  oneof preimage {
+    // This should be set to obtain an attestation that a validator specified in
+    // a ConvertSubnetTx has been removed from the validator set.
+    SubnetIDIndex convert_subnet_tx_data = 1;
+    // This should be set to a RegisterSubnetValidatorMessage to obtain an
+    // attestation that a validator is not currently registered and can never be
+    // registered. This can be because the validator was successfully added and
+    // then later removed, or because the validator was never added and the
+    // registration expired.
+    bytes register_subnet_validator_message = 2;
+  }
+}
+
+message SubnetIDIndex {
+  bytes subnet_id = 1;
+  uint32 index = 2;
+}

snow/snowtest/context.go

@@ -65,6 +65,9 @@ func Context(tb testing.TB, chainID ids.ID) *snow.Context {
 	require.NoError(aliaser.Alias(CChainID, CChainID.String()))
 
 	validatorState := &validatorstest.State{
+		GetMinimumHeightF: func(context.Context) (uint64, error) {
+			return 0, nil
+		},
 		GetSubnetIDF: func(_ context.Context, chainID ids.ID) (ids.ID, error) {
 			subnetID, ok := map[ids.ID]ids.ID{
 				constants.PlatformChainID: constants.PrimaryNetworkID,