Add getPayloadAttestationSignature for local signing (#7750)

* Add PayloadAttestaition message support to web3signer

* update copyright year and AllTests-mainnet, add remote signing test

* remove debug echo's

* remove remote remote signing support for payload attestations

Author: Tomi-3-0

AllTests-mainnet.md

@@ -834,6 +834,7 @@ AllTests-mainnet
 + Signing aggregate and proof (getAggregateAndProofSignature(phase0))                        OK
 + Signing aggregation slot (getSlotSignature())                                              OK
 + Signing attestation (getAttestationSignature())                                            OK
++ Signing payload attestation message (getPayloadAttestationSignature())                     OK
 + Signing randao reveal (getEpochSignature())                                                OK
 + Signing validator registration (getBuilderSignature())                                     OK
 + Signing voluntary exit (getValidatorExitSignature())                                       OK

beacon_chain/validators/validator_pool.nim

@@ -799,3 +799,18 @@ proc getBuilderSignature*(v: AttachedValidator, genesis_fork_version: Version,
   of ValidatorKind.Remote:
     let request = Web3SignerRequest.init(ZERO_HASH, validatorRegistration)
     await v.signData(request)
+
+# https://github.com/ethereum/consensus-specs/blob/v1.6.1/specs/gloas/validator.md#constructing-payload_attestations
+proc getPayloadAttestationSignature*(v: AttachedValidator, fork: Fork,
+                              genesis_validators_root: Eth2Digest,
+                              message: PayloadAttestationMessage,
+                             ): Future[SignatureResult]
+                             {.async: (raises: [CancelledError]).} =
+  case v.kind
+  of ValidatorKind.Local:
+    SignatureResult.ok(
+      get_payload_attestation_message_signature(
+        fork, genesis_validators_root, message,
+        v.data.privateKey).toValidatorSig())
+  of ValidatorKind.Remote:
+    return SignatureResult.err("Remote signer lacks payload attestation support")

tests/test_signing_node.nim

@@ -837,6 +837,30 @@ block:
         sres2.get() == rres2.get()
         sres3.get() == rres3.get()
 
+    asyncTest "Signing payload attestation message (getPayloadAttestationSignature())":
+      let
+        payloadMessage = PayloadAttestationMessage(
+          validator_index: 100,
+          data: PayloadAttestationData(
+            beacon_block_root: SomeOtherRoot,
+            slot: Slot(10),
+            payload_present: true,
+            blob_data_available: true
+          ),
+          signature: ValidatorSig.fromHex(SomeSignature).get()
+        )
+        sres1 = await validator1.getPayloadAttestationSignature(SigningFork,
+          GenesisValidatorsRoot, payloadMessage)
+        sres2 = await validator2.getPayloadAttestationSignature(SigningFork,
+          GenesisValidatorsRoot, payloadMessage)
+        sres3 = await validator3.getPayloadAttestationSignature(SigningFork,
+          GenesisValidatorsRoot, payloadMessage)
+
+      check:
+        sres1.isOk()
+        sres2.isOk()
+        sres3.isOk()
+
     asyncTest "Connection timeout test":
       let
         request = Web3SignerRequest.init(SigningFork, GenesisValidatorsRoot,