GraphQL 配合 JWT 使用 —— Laravel RSS (二)

我们了解了 jwt 和 GraphQL 的使用，那接下来看看他们如何结合使用。

小试牛刀

创建 myProfile query

<?php
/**
 * User: yemeishu
 * Date: 2018/4/21
 * Time: 上午8:55
 */

namespace App\GraphQL\Query;

use App\User;
use Rebing\GraphQL\Support\Facades\GraphQL;
use Rebing\GraphQL\Support\Query;
use Rebing\GraphQL\Support\SelectFields;
use Tymon\JWTAuth\Facades\JWTAuth;

class MyProfileQuery extends Query {
    private $auth;

    protected $attributes = [
        'name' => 'My Profile Query',
        'description' => 'My Profile Information'
    ];

    public function authorize(array $args) {
        try {
            $this->auth = JWTAuth::parseToken()->authenticate();
        } catch (\Exception $e) {
            $this->auth = null;
        }

        return (boolean) $this->auth;
    }

    public function type() {
        return GraphQL::type('myprofile');
    }

    public function resolve($root, $args, SelectFields $fields) {
        $user = User::with(array_keys($fields->getRelations()))
            ->where('id', $this->auth->id)
            ->select($fields->getSelect())->first();

        return $user;
    }

}

创建 Type

<?php
/**
 * User: yemeishu
 * Date: 2018/4/21
 * Time: 下午3:59
 */

namespace App\GraphQL\Type;

use App\User;
use GraphQL\Type\Definition\Type;
use Rebing\GraphQL\Support\Facades\GraphQL;
use Rebing\GraphQL\Support\Type as GraphQLType;

class MyProfileType extends GraphQLType
{
    protected $attributes = [
        'name' => 'myprofile',
        'description' => 'A type',
        'model' => User::class, // define model for users type
    ];

    // define field of type
    public function fields()
    {
        return [
            'id' => [
                'type' => Type::nonNull(Type::int()),
                'description' => 'The id of the user'
            ],
            'email' => [
                'type' => Type::string(),
                'description' => 'The email of user'
            ],
            'name' => [
                'type' => Type::string(),
                'description' => 'The name of the user'
            ]
        ];
    }

    protected function resolveEmailField($root, $args)
    {
        return strtolower($root->email);
    }
}

注册 GraphQL config

当然要获取 jwt token，需要有一个 login 方法：

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Tymon\JWTAuth\Exceptions\JWTException;
use Tymon\JWTAuth\JWTAuth;

class AuthenticateController extends Controller {
    private $jwt;

    public function __construct(JWTAuth $jwt) {
        $this->jwt = $jwt;
    }

    public function authenticate(Request $request) {
        // grab credentials from the request
        $credentials = $request->only('email', 'password');
        try {
            // attempt to verify the credentials and create a token for the user
            if (! $token = $this->jwt->attempt($credentials)) {
                return response()->json(['error' => 'invalid_credentials'], 401);
            }
        } catch (JWTException $e) {
            // something went wrong whilst attempting to encode the token
            return response()->json(['error' => 'could_not_create_token'], 500);
        }
        // all good so return the token
        return response()->json(compact('token'));
    }
}

注册路由：

Route::post('/login', 'AuthenticateController@authenticate');

先利用 email 和 password 获得 token 值：

然后利用 token 获取用户信息：

获取 Xpath List

在 RSS 系统中，我们也希望给每个用户创建自己的 RSS Feeds。所以先修改 xpath 的归属。

php artisan make:migration add_user_id_to_xpaths_table --table=xpaths

public function up() {
    Schema::table('xpaths', function (Blueprint $table) {
        $table->integer('user_id')->unsigned();
    });
}

admin 添加 xpath 归属操作

在 XpathController 的 form 函数增加 user_id 的选择框：

$form->select('user_id')->options(function ($id) {
    $user = User::find($id);
    if ($user) {
        return [$user->id => $user->name];
    }
})->ajax('/admin/users');

添加 admin/users route 和 controller

<?php

namespace App\Admin\Controllers;

use App\User;
use Illuminate\Http\Request;
use App\Http\Controllers\Controller;

class UserController extends Controller {

    public function users(Request $request) {
        $q = $request->get('q');
        return User::where('name', 'like', "%$q%")
            ->paginate(null, ['id', 'name as text']);
    }
}

这样就可以根据输入的 user name 来选择这个 xpath 的归属。

让 xpath 列表显示 user_id 值.

首先增加 一对一 关联：

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Xpath extends Model
{
    public function user() {
        return $this->belongsTo(User::class);
    }
}

再在 XpathController 的 grid() 直接增加 user's name:

$grid->column('user.name', '归属人');

显示效果：

利用 GraphQL 获取 Xpath 列表

1. 创建 Query

<?php
/**
 * User: yemeishu
 * Date: 2018/4/21
 * Time: 下午11:16
 */

namespace App\GraphQL\Query;

use App\Xpath;
use GraphQL\Type\Definition\Type;
use Rebing\GraphQL\Support\Facades\GraphQL;
use Rebing\GraphQL\Support\Query;
use Rebing\GraphQL\Support\SelectFields;
use Tymon\JWTAuth\Facades\JWTAuth;

class MyXpathsQuery extends Query {
    private $auth;

    protected $attributes = [
        'name' => 'My Xpaths Query',
        'description' => 'My Xpaths Information'
    ];

    public function authorize(array $args) {
        try {
            $this->auth = JWTAuth::parseToken()->authenticate();
        } catch (\Exception $e) {
            $this->auth = null;
        }

        return (boolean) $this->auth;
    }

    public function type() {
        return Type::listOf(GraphQL::type('myxpath'));
    }

    public function resolve($root, $args, SelectFields $fields) {
        $xpaths = Xpath::with(array_keys($fields->getRelations()))
            ->where('user_id', $this->auth->id)
            ->select($fields->getSelect())
            ->get();

        return $xpaths;
    }
}

利用 jwt token 获取 user's id，然后再查询属于该用户的 xpath 列表

2. 定义返回的 Type

<?php
/**
* User: yemeishu
* Date: 2018/4/21
* Time: 下午3:59
*/

namespace App\GraphQL\Type;

use App\User;
use App\Xpath;
use GraphQL\Type\Definition\Type;
use Rebing\GraphQL\Support\Facades\GraphQL;
use Rebing\GraphQL\Support\Type as GraphQLType;

class MyXpathType extends GraphQLType
{
   protected $attributes = [
       'name' => 'myxpath',
       'description' => 'A type',
       'model' => Xpath::class, // define model for xpath type
   ];

   // define field of type
   public function fields()
   {
       return [
           'id' => [
               'type' => Type::nonNull(Type::int()),
               'description' => 'The id of the user'
           ],
           'url' => [
               'type' => Type::string(),
               'description' => 'The url of xpath'
           ],
           'urldesc' => [
               'type' => Type::string(),
               'description' => 'The desc of the xpath'
           ]
       ];
   }
}

3. 注册 GraphQL config

4. 测试

结果自然显而易见：

总结

这是继续上一篇《花 2 小时撸一个 RSS 生成器》https://mp.weixin.qq.com/s/mRjoKgkq1PoqlVgOw8oRYw，主要是想利用 jwt 和 GraphQL 作为接口层，为之后的前端开发，提供数据基础。

主要参考：

• 学习 Lumen 用户认证 (二) —— 使用 jwt-auth 插件 https://mp.weixin.qq.com/s/k1v-mji7YyilEBoLTw8Dig
• 推荐一个 Laravel admin 后台管理插件 https://mp.weixin.qq.com/s/PnAj0j2X3-lq3Mn06qjIdQ
• 结合 Laravel 初步学习 GraphQL https://mp.weixin.qq.com/s/Uvv4X9hXT8No1MjNlCPqXg

源代码

https://github.com/fanly/lrss

「未完待续」