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name : NavPolicy.php
 <?php

namespace Statamic\Policies;

use Statamic\Facades\Nav;
use Statamic\Facades\User;

class NavPolicy
{
    use Concerns\HasMultisitePolicy;

    public function before($user)
    {
        $user = User::fromUser($user);

        if ($user->hasPermission('configure navs')) {
            return true;
        }
    }

    public function index($user)
    {
        $user = User::fromUser($user);

        if ($this->create($user)) {
            return true;
        }

        return ! Nav::all()->filter(function ($nav) use ($user) {
            return $this->view($user, $nav);
        })->isEmpty();
    }

    public function create($user)
    {
        // handled by before()
    }

    public function store($user)
    {
        // handled by before()
    }

    public function configure($user)
    {
        // handled by before()
    }

    public function view($user, $nav)
    {
        $user = User::fromUser($user);

        if (! $this->userCanAccessAnySite($user, $nav->sites())) {
            return false;
        }

        return $this->edit($user, $nav)
            || $user->hasPermission("view {$nav->handle()} nav");
    }

    public function edit($user, $nav)
    {
        $user = User::fromUser($user);

        if (! $this->userCanAccessAnySite($user, $nav->sites())) {
            return false;
        }

        return $user->hasPermission("edit {$nav->handle()} nav");
    }

    public function update($user, $nav)
    {
        $user = User::fromUser($user);

        return $this->edit($user, $nav);
    }

    public function delete($user, $nav)
    {
        // handled by before()
    }
}
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