added cyok implementation

src/main/java/com/auth0/client/mgmt/KeysEntity.java

@@ -3,6 +3,7 @@
 import com.auth0.json.mgmt.keys.Key;
 import com.auth0.net.EmptyBodyRequest;
 import com.auth0.net.BaseRequest;
+import com.auth0.net.EmptyBodyVoidRequest;
 import com.auth0.net.Request;
 import com.auth0.net.client.Auth0HttpClient;
 import com.auth0.net.client.HttpMethod;
@@ -100,4 +101,20 @@ public Request<Key> revoke(String kid) {
         return new EmptyBodyRequest<>(this.client, tokenProvider, url, HttpMethod.PUT, new TypeReference<Key>() {
         });
     }
+
+    /**
+     * Perform rekeying operation on the key hierarchy.
+     * A token with scope create:encryption_keys and update:encryption_keys is needed
+     * See https://auth0.com/docs/api/management/v2#!/Keys/post-encryption-rekey
+     * @return a Request to execute.
+     */
+    public Request<Void> rekey(){
+        String url = baseUrl
+            .newBuilder()
+            .addPathSegments("api/v2/keys/encryption/rekey")
+            .build()
+            .toString();
+
+        return new EmptyBodyVoidRequest<>(this.client, tokenProvider, url, HttpMethod.POST, new TypeReference<Void>() {});
+    }
 }

src/main/java/com/auth0/net/EmptyBodyVoidRequest.java

@@ -0,0 +1,42 @@
+package com.auth0.net;
+
+import com.auth0.client.mgmt.TokenProvider;
+import com.auth0.exception.Auth0Exception;
+import com.auth0.net.client.Auth0HttpClient;
+import com.auth0.net.client.Auth0HttpResponse;
+import com.auth0.net.client.HttpMethod;
+import com.auth0.net.client.HttpRequestBody;
+import com.fasterxml.jackson.core.type.TypeReference;
+
+/**
+ * Request class that does not accept parameters to be sent as part of its body and request doesn't return any value on its success.
+ * The content type of this request is "application/json".
+ *
+ * @param <T> The type expected to be received as part of the response.
+ * @see BaseRequest
+ */
+public class EmptyBodyVoidRequest<T> extends BaseRequest<T>  {
+    public EmptyBodyVoidRequest(Auth0HttpClient client, TokenProvider tokenProvider, String url, HttpMethod method, TypeReference<T> tType) {
+        super(client, tokenProvider, url, method, tType);
+    }
+
+    @Override
+    @SuppressWarnings("deprecation")
+    protected HttpRequestBody createRequestBody() {
+        return HttpRequestBody.create("application/json", new byte[0]);
+    }
+
+    @Override
+    public EmptyBodyVoidRequest<T> addParameter(String name, Object value) {
+        //do nothing
+        return this;
+    }
+    @Override
+    protected T parseResponseBody(Auth0HttpResponse response) throws Auth0Exception {
+        if (!response.isSuccessful()) {
+            throw super.createResponseException(response);
+        }
+        return null;
+    }
+
+}

src/test/java/com/auth0/client/mgmt/KeysEntityTest.java

@@ -95,4 +95,18 @@ public void shouldRevokeKey() throws Exception {
 
         assertThat(response, is(notNullValue()));
     }
+
+    @Test
+    public void shouldRekey() throws Exception {
+        Request<Void> request = api.keys().rekey();
+        assertThat(request, is(notNullValue()));
+
+        server.emptyResponse(204);
+        request.execute().getBody();
+        RecordedRequest recordedRequest = server.takeRequest();
+
+        assertThat(recordedRequest, hasMethodAndPath(HttpMethod.POST, "/api/v2/keys/encryption/rekey"));
+        assertThat(recordedRequest, hasHeader("Content-Type", "application/json"));
+        assertThat(recordedRequest, hasHeader("Authorization", "Bearer apiToken"));
+    }
 }