Fix set graffiti request

Author: courtneyeh

validator/client/src/main/java/tech/pegasys/teku/validator/client/restapi/apis/SetGraffiti.java

@@ -23,7 +23,9 @@
 import com.fasterxml.jackson.core.JsonProcessingException;
 import java.io.IOException;
 import java.util.Optional;
+import java.util.function.Function;
 import tech.pegasys.teku.bls.BLSPublicKey;
+import tech.pegasys.teku.infrastructure.json.types.DeserializableTypeDefinition;
 import tech.pegasys.teku.infrastructure.restapi.endpoints.EndpointMetadata;
 import tech.pegasys.teku.infrastructure.restapi.endpoints.RestApiEndpoint;
 import tech.pegasys.teku.infrastructure.restapi.endpoints.RestApiRequest;
@@ -35,6 +37,18 @@ public class SetGraffiti extends RestApiEndpoint {
   private final KeyManager keyManager;
   private final GraffitiManager graffitiManager;
 
+  public static final DeserializableTypeDefinition<String> GRAFFITI_REQUEST_TYPE =
+      DeserializableTypeDefinition.object(String.class, StringBuilder.class)
+          .initializer(StringBuilder::new)
+          .finisher(StringBuilder::toString)
+          .withField(
+              "graffiti",
+              STRING_TYPE.withDescription(
+                  "Arbitrary data to set in the graffiti field of BeaconBlockBody"),
+              Function.identity(),
+              StringBuilder::append)
+          .build();
+
   public SetGraffiti(final KeyManager keyManager, final GraffitiManager graffitiManager) {
     super(
         EndpointMetadata.post(GetGraffiti.ROUTE)
@@ -44,7 +58,7 @@ public SetGraffiti(final KeyManager keyManager, final GraffitiManager graffitiMa
             .tags(TAG_GRAFFITI)
             .withBearerAuthSecurity()
             .pathParam(PARAM_PUBKEY_TYPE)
-            .requestBodyType(STRING_TYPE.withDescription("Graffiti string"))
+            .requestBodyType(GRAFFITI_REQUEST_TYPE)
             .response(SC_NO_CONTENT, "Successfully updated graffiti.")
             .withAuthenticationResponses()
             .withNotFoundResponse()

validator/client/src/test/resources/tech/pegasys/teku/validator/client/restapi/paths/_eth_v1_validator_{pubkey}_graffiti.json

@@ -99,8 +99,14 @@
       "content" : {
         "application/json" : {
           "schema" : {
-            "type" : "string",
-            "description" : "Graffiti string"
+            "type" : "object",
+            "required" : [ "graffiti" ],
+            "properties" : {
+              "graffiti" : {
+                "type" : "string",
+                "description" : "Arbitrary data to set in the graffiti field of BeaconBlockBody"
+              }
+            }
           }
         }
       }