The body of prepare_beacon_proposer is an array (Fixes #3920) (#3938)

beacon_chain/rpc/rest_validator_api.nim

@@ -764,21 +764,22 @@ proc installValidatorApiHandlers*(router: var RestRouter, node: BeaconNode) =
              "/eth/v1/validator/prepare_beacon_proposer") do (
     contentBody: Option[ContentBody]) -> RestApiResponse:
     let
-      proposerData =
+      body =
         block:
           if contentBody.isNone():
             return RestApiResponse.jsonError(Http400, EmptyRequestBodyError)
-          let dres = decodeBody(PrepareBeaconProposerBody, contentBody.get())
+          let dres = decodeBody(seq[PrepareBeaconProposer], contentBody.get())
           if dres.isErr():
             return RestApiResponse.jsonError(Http400,
                                              InvalidPrepareBeaconProposerError)
           dres.get()
       currentEpoch = node.beaconClock.now.slotOrZero.epoch
 
-    node.dynamicFeeRecipientsStore.addMapping(
-      proposerData.validator_index,
-      proposerData.fee_recipient,
-      currentEpoch)
+    for proposerData in body:
+      node.dynamicFeeRecipientsStore.addMapping(
+        proposerData.validator_index,
+        proposerData.fee_recipient,
+        currentEpoch)
 
     return RestApiResponse.response("", Http200, "text/plain")
 

beacon_chain/spec/eth2_apis/eth2_rest_serialization.nim

@@ -92,7 +92,7 @@ type
     ImportDistributedKeystoresBody |
     ImportRemoteKeystoresBody |
     KeystoresAndSlashingProtection |
-    PrepareBeaconProposerBody |
+    PrepareBeaconProposer |
     ProposerSlashing |
     SetFeeRecipientRequest |
     SignedBlindedBeaconBlock |
@@ -105,6 +105,7 @@ type
 
   EncodeArrays* =
     seq[Attestation] |
+    seq[PrepareBeaconProposer] |
     seq[RemoteKeystoreInfo] |
     seq[RestCommitteeSubscription] |
     seq[RestSignedContributionAndProof] |
@@ -128,7 +129,7 @@ type
     KeymanagerGenericError |
     KeystoresAndSlashingProtection |
     ListFeeRecipientResponse |
-    PrepareBeaconProposerBody |
+    PrepareBeaconProposer |
     ProduceBlockResponseV2 |
     RestDutyError |
     RestGenericError |

beacon_chain/spec/eth2_apis/rest_types.nim

@@ -242,7 +242,7 @@ type
     epoch*: Epoch
     active*: bool
 
-  PrepareBeaconProposerBody* = object
+  PrepareBeaconProposer* = object
     validator_index*: ValidatorIndex
     fee_recipient*: Eth1Address
 

beacon_chain/spec/eth2_apis/rest_validator_calls.nim

@@ -90,7 +90,7 @@ proc publishContributionAndProofs*(body: seq[RestSignedContributionAndProof]): R
      meth: MethodPost.}
   ## https://ethereum.github.io/beacon-APIs/#/Validator/publishContributionAndProofs
 
-proc prepareBeaconProposer*(body: PrepareBeaconProposerBody): RestPlainResponse {.
+proc prepareBeaconProposer*(body: seq[PrepareBeaconProposer]): RestPlainResponse {.
      rest, endpoint: "/eth/v1/validator/prepare_beacon_proposer",
      meth: MethodPost.}
   ## https://ethereum.github.io/beacon-APIs/#/ValidatorRequiredApi/prepareBeaconProposer