Laravel Lighthouse限制突变场

编程问答 2022-08-11

问题描述

我想保护内容类型的某些特定字段，以仅允许管理员用户修改值，但允许用户访问它。

想象一下User类型和一个is_admin字段。只有管​​理员应该能够更新它，但每个人都应该能够阅读它。

type User {
    id: ID!
    name: String!
    email: String!
    is_admin: Boolean!
}

can指令似乎不适用于突变字段。最初，我尝试添加带有自定义策略的@can(ability: "setAdmin")，但没有任何效果。对突变“有效”使用相同的罐头/策略，但这还不够精细。

自定义字段限制using a custom directive似乎应该有所帮助，但这似乎在突变输入类型的字段级别上也不起作用。

type mutation {
    updateUser(
        input: UpdateUserInput! @spread
    ): User @update @middleware(checks: ["auth:api"])
}

input UpdateUserInput {
    id: ID!
    name: String!
    email: String!
    is_admin: Boolean! @adminOnly
}

在app/GraphQL/Directives/AdminOnlyDirective.PHP中使用此自定义指令

<?PHP

namespace App\GraphQL\Directives;

use Closure;
use GraphQL\Type\DeFinition\ResolveInfo;
use Nuwave\Lighthouse\Exceptions\DeFinitionException;
use Nuwave\Lighthouse\Schema\Directives\BaseDirective;
use Nuwave\Lighthouse\Schema\Values\FieldValue;
use Nuwave\Lighthouse\Support\Contracts\DefinedDirective;
use Nuwave\Lighthouse\Support\Contracts\FieldMiddleware;
use Nuwave\Lighthouse\Support\Contracts\GraphQLContext;

class AdminOnlyDirective extends BaseDirective implements FieldMiddleware,DefinedDirective
{
    /**
     * Name of the directive as used in the schema.
     *
     * @return string
     */
    public function name(): string
    {
        return 'adminOnly';
    }

    public static function deFinition(): string
    {
        return /** @lang GraphQL */ <<<GRAPHQL
"""
Limit field update to only admin.
"""
directive @adminOnly() on FIELD_DEFinitioN
GRAPHQL;
    }

    public function handleField(FieldValue $fieldValue,Closure $next): FieldValue
    {
        $originalResolver = $fieldValue->getResolver();

        return $next(
            $fieldValue->setResolver(
                function ($root,array $args,GraphQLContext $context,ResolveInfo $resolveInfo) use ($originalResolver) {
                    $user = $context->user();
                    if (
                        // Unauthenticated users don't get to see anything
                        ! $user
                        // The user's role has to match have the required role
                        || !$user->is_admin
                    ) {
                        return null;
                    }

                    return $originalResolver($root,$args,$context,$resolveInfo);
                }
            )
        );
    }
}

那么，有没有一种方法可以防止使用laravel灯塔“更新”特定字段？

解决方法

现在，您可以在插入数据库之前使用https://lighthouse-php.com/4.16/custom-directives/argument-directives.html#argtransformerdirective将该字段转换为from PIL import Image as PilImage import io import base64 import os from .models import Image class Images(View): url = "images/select_image.html" def get(self,request): dir = <image file directory> image_names = ['red','green','blue'] for image_name in image_names: base_path = os.sep.join([dir,image_name]) path = '.'.join([base_path,'png']) pil_image = PilImage.open(path) encoded_image = self._encode_image(pil_image) Image.objects.get_or_create(name=image_name,image=encoded_image) context = {'images': image_names} return render(request,self.url,context) @staticmethod def _encode_image(image): """Return image encoded to base64 from a PIL.Image.Image.""" io_buffer = io.BytesIO() image.save(io_buffer,format='PNG') saved_image = io_buffer.getvalue() encoded_image = ''.join(['data:image/jpg;base64,',base64.b64encode(saved_image).decode()]) return encoded_image class DisplayImage(View): url = "images/display_image.html" def get(self,request,image_name): image = get_object_or_404(Image,name=image_name) context = {'image': image.image} return render(request,context) ，或者抛出错误以避免对特定字段进行更改，就像@trim的行为一样；

在灯塔v5中，其类null已重命名为ArgTransformerDirective，方法ArgSanitizerDirective已重命名为transform

https://github.com/nuwave/lighthouse/blob/v5.0-alpha.3/src/Schema/Directives/TrimDirective.php

额外：

我仍然在想@can的工作原理，因为我仍然需要删除整个属性，而不是将null传递给数据库；

更新：@仅适用于sanitize类型而不是input类型

,

我在这里想到的第一个想法是创建两个不同的输入和/或突变。例如。对于有权访问该字段的管理员：

updateUserAsAdmin(
    input: UpdateUserFullInput! @spread
): User @update 
        @middleware(checks: ["auth:api"]) 
        @can("users.update.full")

UpdateUserFullInput包含is_admin字段。

我也多次遇到此讨论：https://github.com/nuwave/lighthouse/issues/325 也许您还可以在这里找到一些有用的想法。

您可能还需要查看官方文档：https://github.com/nuwave/lighthouse/blob/master/docs/master/security/authorization.md#custom-field-restrictions

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