ClientContext json exception when we have json input as payload

I have a json payload of api gateway request for one of my java functions this is a seperate file http-event.json in my serverless stack

warmup:
    enabled: false
    cleanFolder: false
    memorySize: 256
    name:  ${self:custom.stageOption}-warmup
    timeout: 20
    prewarm: true
    payload: ${file(http-event.json)}

function produces payload with json string, but when invoking the function with client context below param is not working as it produces a JSON and when the target function gets invoked with the context it tries to json parse the string and getting an exception in target lambda

const params = {
      ClientContext: Buffer.from(`{"custom":${func.config.payload}}`).toString('base64'),
      FunctionName: func.name,
      InvocationType: "RequestResponse",
      LogType: "None",
      Qualifier: process.env.SERVERLESS_ALIAS || "$LATEST",
      Payload: func.config.payload
    };

[jayasai470]

@juanjoDiaz please suggest an approach by which we can use this plugin like having a flag to remove the clientContext or removing the clientContext completly? if so I can look into a PR ?

[jayasai470]

so in that repo found this

/* Copyright 2015 Amazon.com, Inc. or its affiliates. All Rights Reserved. */

package com.amazonaws.services.lambda.runtime;

import java.util.Map;

/**
 * 
 * Provides information about client configuration and execution environment.
 *
 */
public interface ClientContext {
    /**
     * Gets the client information provided by the AWS Mobile SDK
     * 
     */
    public Client getClient();

    /**
     * Gets custom values set by the client application
     * <p>
     * This map is mutable (and not thread-safe if mutated)
     * </p>
     */
    public Map<String, String> getCustom();
 
    /**
     * Gets environment information provided by mobile SDK, immutable. 
     * 
     */
    public Map<String, String> getEnvironment();

}

custom is a map and does not support complex objects, not sure if its a requirement i couldn’t find any docs on this