Socialiteで連携したSNSのプロフィールリンクを貼る方法

$ php artisan make:model SocialAccount --migration 

     /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('social_accounts', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->unsignedBigInteger('user_id');
            $table->string('provider_name');
            $table->string('provider_id')->unique();
            $table->string('token')->unique();
            $table->string('secret_token')->unique();
            $table->timestamps();

            // 外部キー制約
            $table->foreign('user_id')
                ->references('id')->on('users')
                ->onDelete('cascade');
        });
    }

    public function socialAccounts()
    {
        return $this->hasMany('App\SocialAccount');
    }

    protected $fillable = ['provider_name', 'provider_id', 'token', 'secret_token'];

    public function user()
    {
        return $this->belongsTo('App\User');
    }

$ php artisan migrate

$ mkdir app/Services

namespace App\Services;

use Laravel\Socialite\Contracts\User as ProviderUser;
use App\SocialAccount;
use App\User;

class SocialService
{
    /**
     *  検索か新規作成
     *
     *  @param ProviderUser $providerUser
     *  @param str $provider
     *  @return \App\User
     */
    public static function findOrCreate(ProviderUser $providerUser, $provider)
    {
        // SNS連携済みユーザがいれば返す
        $socialAccount = SocialAccount::where('provider_name', $provider)
                            ->where('provider_id', $providerUser->getId())
                            ->first();
        if ($socialAccount) {
            return $socialAccount->user;
        }

        $user = User::where('email', $providerUser->getEmail())->first();
        if (!$user) {
            // ユーザの新規作成
            $user = User::create([
                'email' => $providerUser->getEmail(),
                'name'  => $providerUser->getName()
            ]);
        }
        
        // SNSアカウントの新規作成
        $user->socialAccounts()->create([
            'provider_id'   => $providerUser->getId(),
            'provider_name' => $provider,
            'token'         => $providerUser->token,
            'secret_token'  => $providerUser->tokenSecret
        ]);

        return $user;

    }
}

    /**
     * OAuth認証の結果受け取り
     *
     * @param str $provider
     * @return \Illuminate\Http\Response
     */
    public function handleProviderCallback($provider)
    {
        try {
            $providerUser = Socialite::with($provider)->user();
        } catch(\Exception $e) {
            return redirect('/login')->with('oauth_error', '予期せぬエラーが発生しました');
        }

        if ($email = $providerUser->getEmail()) {
            Auth::login(SocialService::findOrCreate($providerUser, $provider));
            return redirect($this->redirectTo);
        } else {
            return redirect('/login')->with('oauth_error', 'メールアドレスが取得できませんでした');
        }

    }

/**
 * プロフィールページ
 */
Route::get('/user/{userId}', 'UserController@show');

use Socialite;

class SocialService
{
    /**
     * リンクを取得
     */
    public static function findLink($provider, $token, $secret)
    {
        $user = Socialite::driver($provider)->userFromTokenAndSecret($token, $secret);
        if (!$user) return '';

        switch ($provider) {
            case 'twitter':
                return 'https://twitter.com/' . $user->nickname;
            default:
                return '';
        }

    }
}

}

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\User;
use App\Services\SocialService;

class UserController extends Controller
{

    /**
     * プロフィールページの表示
     *
     * @return \Illuminate\Contracts\Support\Renderable
     */
    public function show($userId)
    {
        $userId = intval($userId);

        $user = User::findOrFail($userId);

        // social_account情報
        $socialAccounts = [];
        foreach ($user->socialAccounts as $account) {
            $socialAccounts[$account->provider_name]['link'] = SocialService::findLink($account->provider_name, $account->token, $account->secret_token);
        }

        return view('user/show', [
            'user'              => $user,
            'socialAccounts'    => $socialAccounts
        ]);
    }
}

                    @foreach ($socialAccounts as $provider => $account)
                        @if (isset($account['link']) && $account['link'])
                            <a href="{{ $account['link'] }}" target="_blank" rel="noopener noreferrer">
                            @if ($provider === 'twitter')
                               <i class="fab fa-twitter-square fa-2x"></i> 
                            @else
                                {{ $provider }}
                            @endif
                            </a>
                        @endif
                    @endforeach

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