Can you provide an example of a postRepository handling authorization in Statamic

php
<?php

namespace Statamic\Eloquent\Entries;

use Statamic\Contracts\Entries\EntryRepository as EntryRepositoryContract;
use Statamic\Facades\User;

class EntryRepository implements EntryRepositoryContract
{
    /**
     * Get the entry body.
     *
     * @param \Statamic\Contracts\Auth\User|null $user
     * @param \Statamic\Contracts\Entries\Entry $entry
     * @return string|null
     */
    public function getBody($user, $entry)
    {
        // Implement your authorization logic here
        if ($user && $user->can('view', $entry)) {
            return $entry->body();
        }

        return null;
    }

    // Other repository methods...
}

In this example, the `getBody` method of the `EntryRepository` is responsible for handling the authorization logic. It checks if the provided `$user` object has the necessary permissions to view the `$entry` using the `can` method.

The `can` method is a part of Statamic's authorization system, which allows you to define custom authorization rules based on the user's role, permissions, or any other criteria.

By delegating the authorization logic to the `EntryRepository`, you can ensure that the authorization rules are consistently applied across all the entry-related operations, regardless of how the data is accessed (e.g., through GraphQL, API, or other means).

This approach helps maintain a single source of truth for authorization and avoids duplication of code across different parts of your application.