用ThinkPHP6帮我写一个后台权限分配

好的，以下是一个简单的 ThinkPHP6 后台权限分配示例。

1. 创建一个名为 `Admin` 的控制器，并添加以下代码：

namespace app\admin\controller;

use think\facade\View;
use app\admin\model\Admin as AdminModel;
use app\admin\model\Role as RoleModel;
use app\admin\model\Permission as PermissionModel;

class Admin extends Base
{
    public function index()
    {
        $adminList = AdminModel::select();
        View::assign('adminList', $adminList);
        return View::fetch();
    }

    public function add()
    {
        $roleList = RoleModel::select();
        View::assign('roleList', $roleList);
        return View::fetch();
    }

    public function save()
    {
        $data = $this->request->post();
        $admin = new AdminModel();
        $admin->username = $data['username'];
        $admin->password = md5($data['password']);
        $admin->role_id = $data['role_id'];
        $admin->save();
        return redirect(url('index'));
    }

    public function edit($id)
    {
        $admin = AdminModel::get($id);
        $roleList = RoleModel::select();
        View::assign('admin', $admin);
        View::assign('roleList', $roleList);
        return View::fetch();
    }

    public function update($id)
    {
        $data = $this->request->post();
        $admin = AdminModel::get($id);
        $admin->username = $data['username'];
        $admin->role_id = $data['role_id'];
        if ($data['password']) {
            $admin->password = md5($data['password']);
        }
        $admin->save();
        return redirect(url('index'));
    }

    public function delete($id)
    {
        AdminModel::destroy($id);
        return redirect(url('index'));
    }
}

2. 创建一个名为 `Role` 的控制器，并添加以下代码：

namespace app\admin\controller;

use think\facade\View;
use app\admin\model\Role as RoleModel;
use app\admin\model\Permission as PermissionModel;

class Role extends Base
{
    public function index()
    {
        $roleList = RoleModel::select();
        View::assign('roleList', $roleList);
        return View::fetch();
    }

    public function add()
    {
        $permissionList = PermissionModel::select();
        View::assign('permissionList', $permissionList);
        return View::fetch();
    }

    public function save()
    {
        $data = $this->request->post();
        $role = new RoleModel();
        $role->name = $data['name'];
        $role->save();
        $role->permissions()->saveAll($data['permissions']);
        return redirect(url('index'));
    }

    public function edit($id)
    {
        $role = RoleModel::get($id);
        $permissionList = PermissionModel::select();
        View::assign('role', $role);
        View::assign('permissionList', $permissionList);
        return View::fetch();
    }

    public function update($id)
    {
        $data = $this->request->post();
        $role = RoleModel::get($id);
        $role->name = $data['name'];
        $role->permissions()->detach();
        $role->permissions()->saveAll($data['permissions']);
        $role->save();
        return redirect(url('index'));
    }

    public function delete($id)
    {
        RoleModel::destroy($id);
        return redirect(url('index'));
    }
}

3. 创建一个名为 `Permission` 的控制器，并添加以下代码：

namespace app\admin\controller;

use think\facade\View;
use app\admin\model\Permission as PermissionModel;

class Permission extends Base
{
    public function index()
    {
        $permissionList = PermissionModel::select();
        View::assign('permissionList', $permissionList);
        return View::fetch();
    }

    public function add()
    {
        return View::fetch();
    }

    public function save()
    {
        $data = $this->request->post();
        $permission = new PermissionModel();
        $permission->name = $data['name'];
        $permission->save();
        return redirect(url('index'));
    }

    public function edit($id)
    {
        $permission = PermissionModel::get($id);
        View::assign('permission', $permission);
        return View::fetch();
    }

    public function update($id)
    {
        $data = $this->request->post();
        $permission = PermissionModel::get($id);
        $permission->name = $data['name'];
        $permission->save();
        return redirect(url('index'));
    }

    public function delete($id)
    {
        PermissionModel::destroy($id);
        return redirect(url('index'));
    }
}

4. 创建一个名为 `Base` 的控制器作为其他控制器的父类，并添加以下代码：

namespace app\admin\controller;

use think\Controller;
use think\facade\Session;
use app\admin\model\Admin as AdminModel;

class Base extends Controller
{
    protected function initialize()
    {
        parent::initialize();
        $this->checkLogin();
        $this->checkPermission();
    }

    protected function checkLogin()
    {
        if (!Session::get('admin_id')) {
            $this->redirect(url('login/index'));
        }
    }

    protected function checkPermission()
    {
        $admin = AdminModel::get(Session::get('admin_id'));
        if (!$admin->role->hasPermission(request()->controller(), request()->action())) {
            $this->error('您没有权限访问该页面！');
        }
    }
}

5. 创建三个模型分别为 `Admin`、`Role` 和 `Permission`，并添加以下代码：

namespace app\admin\model;

use think\Model;

class Admin extends Model
{
    public function role()
    {
        return $this->belongsTo('Role');
    }
}

class Role extends Model
{
    public function permissions()
    {
        return $this->belongsToMany('Permission');
    }

    public function hasPermission($controller, $action)
    {
        foreach ($this->permissions as $permission) {
            if ($permission->controller == $controller && $permission->action == $action) {
                return true;
            }
        }
        return false;
    }
}

class Permission extends Model
{
    public function roles()
    {
        return $this->belongsToMany('Role');
    }
}

6. 创建三个数据表分别为 `admin`、`role` 和 `permission`，并添加以下字段：

CREATE TABLE `admin` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `username` varchar(50) NOT NULL DEFAULT '',
  `password` varchar(50) NOT NULL DEFAULT '',
  `role_id` int(11) unsigned NOT NULL DEFAULT '0',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE `role` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `name` varchar(50) NOT NULL DEFAULT '',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE `permission` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `name` varchar(50) NOT NULL DEFAULT '',
  `controller` varchar(50) NOT NULL DEFAULT '',
  `action` varchar(50) NOT NULL DEFAULT '',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE `role_permission` (
  `role_id` int(11) unsigned NOT NULL,
  `permission_id` int(11) unsigned NOT NULL,
  PRIMARY KEY (`role_id`,`permission_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

ALTER TABLE `admin` ADD CONSTRAINT `admin_role` FOREIGN KEY (`role_id`) REFERENCES `role` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;

ALTER TABLE `role_permission` ADD CONSTRAINT `role_permission_role` FOREIGN KEY (`role_id`) REFERENCES `role` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;

ALTER TABLE `role_permission` ADD CONSTRAINT `role_permission_permission` FOREIGN KEY (`permission_id`) REFERENCES `permission` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;

7. 最后，在 `config/router.php` 文件中添加以下路由：

use think\facade\Route;

Route::group('admin', function () {
    Route::get('login', 'Login/index');
    Route::post('login', 'Login/login');
    Route::get('logout', 'Login/logout');
    Route::get('admin', 'Admin/index');
    Route::get('admin/add', 'Admin/add');
    Route::post('admin/save', 'Admin/save');
    Route::get('admin/edit/:id', 'Admin/edit')->pattern(['id' => '\d+']);
    Route::post('admin/update/:id', 'Admin/update')->pattern(['id' => '\d+']);
    Route::get('admin/delete/:id', 'Admin/delete')->pattern(['id' => '\d+']);
    Route::get('role', 'Role/index');
    Route::get('role/add', 'Role/add');
    Route::post('role/save', 'Role/save');
    Route::get('role/edit/:id', 'Role/edit')->pattern(['id' => '\d+']);
    Route::post('role/update/:id', 'Role/update')->pattern(['id' => '\d+']);
    Route::get('role/delete/:id', 'Role/delete')->pattern(['id' => '\d+']);
    Route::get('permission', 'Permission/index');
    Route::get('permission/add', 'Permission/add');
    Route::post('permission/save', 'Permission/save');
    Route::get('permission/edit/:id', 'Permission/edit')->pattern(['id' => '\d+']);
    Route::post('permission/update/:id', 'Permission/update')->pattern(['id' => '\d+']);
    Route::get('permission/delete/:id', 'Permission/delete')->pattern(['id' => '\d+']);
})->middleware(\app\admin\middleware\Auth::class);

其中，`Auth` 中间件用于检查用户是否登录。如果未登录，将重定向到登录页面。

至此，一个简单的 ThinkPHP6 后台权限分配示例就完成了。