How to add Customer Authentication in Custom GraphQl API. Magento 2

Question

I've created a custom GraphQl API

app\code\Vendor\Extension\etc\schema.graphqls

#Custom Module
type Query
{
 CustomGraphql (
 username: String @doc(description: "Email Address/Mobile Number")
 password: String @doc(description: "Password")
 fieldtype: String @doc(description: "Field Type")
 websiteId: Int = 1 @doc (description: "Website Id")
 ): CustomGraphqlOutput @resolver(class: "Vendor\\Extension\\Model\\Resolver\\CustomGraphql") @doc(description:"Custom Module Datapassing")
}
type CustomGraphqlOutput
{
 username: String
 password: String
 fieldtype: String
}

app\code\Vendor\Extension\Model\Resolver\CustomGraphql.php

<?php
namespace Vendor\Extension\Model\Resolver;
use Magento\Framework\GraphQl\Config\Element\Field;
use Magento\Framework\GraphQl\Exception\GraphQlInputException;
use Magento\Framework\GraphQl\Query\ResolverInterface;
use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Framework\GraphQl\Exception\GraphQlNoSuchEntityException;
class CustomGraphql implements ResolverInterface
{
 /**
 * @param Field $field
 * @param \Magento\Framework\GraphQl\Query\Resolver\ContextInterface $context
 * @param ResolveInfo $info
 * @param array|null $value
 * @param array|null $args
 * @return array|\Magento\Framework\GraphQl\Query\Resolver\Value|mixed
 * @throws GraphQlInputException
 */
 public function resolve(
 Field $field,
 $context,
 ResolveInfo $info,
 array $value = null,
 array $args = null)
 {
 if (!isset($args['username']) || !isset($args['password']) || !isset($args['fieldtype'])||
 empty($args['username']) || empty($args['password']) || empty($args['fieldtype']))
 {
 throw new GraphQlInputException(__('Invalid parameter list.'));
 }
 $output = [];
 $output['username'] = $args['username'];
 $output['password'] = $args['password'];
 $output['fieldtype'] = $args['fieldtype'];
 
 return $output ;
 }
}

Now if I want to add Customer Authentication in the above API then how to Add? thanks

Answer 1

To Authenticate the customer we have to only add

/** @var ContextInterface $context */
 if (false === $context->getExtensionAttributes()->getIsCustomer()) {
 throw new GraphQlAuthorizationException(__('The current customer isn\'t authorized.'));
 }

this before any API so it will check that whether Customer is Authorized or not.. n also if we want to get the current customer ID then we can get it like

$customerId = $context->getUserId();

n you will get the customer ID