php中lumen的自定义依赖注入示例介绍

<?php

namespace App\Contracts;

/**
 * 处理Token的Contracts
 * @package App\Contracts
 */
interface TokenHandler
{
    /**
     * 创建一个token
     * @param $userId integer 用户Id
     * @return string
     */
    public function createToken($userId);

    /**
     * 得到该token的用户
     * @param $token string token值
     * @return \App\User 拥有该token的用户
     */
    public function getTokenUser($token);

    /**
     * 删除一个token
     * @param $token string token值
     * @return bool 是否成功
     */
    public function removeToken($token);
}

<?php

namespace App\Services;

use App\Contracts\TokenHandler;
use App\Orm\Token;

/**
 * 处理Token的Contracts对应的Mysql Service
 * @package App\Services
 */
class MysqlTokenHandler implements TokenHandler
{
    /**
     * @var int 一个用户能够拥有的token最大值
     */
    protected $userTokensMax = 10;

    /**
     * @inheritdoc
     */
    public function createToken($userId)
    {
        while (Token::where('user_id', $userId)->count() >= $this->userTokensMax) {
            Token::where('user_id', $userId)->orderBy('updated_at', 'asc')->first()->delete();
        }

        $token = \Illuminate\Support\Str::random(32);
        if (!Token::create(['token' => $token, 'user_id' => $userId])) {
            return false;
        }

        return $token;
    }

    /**
     * @inheritdoc
     */
    public function getTokenUser($token)
    {
        $tokenObject = Token::where('token', $token)->first();

        return $tokenObject && $tokenObject->user ? $tokenObject->user : false;
    }

    /**
     * @inheritdoc
     */
    public function removeToken($token)
    {
        return Token::find($token)->delete();
    }
}

$app->singleton(
    App\Contracts\TokenHandler::class,
    App\Services\MysqlTokenHandler::class);

    public function logout(Request $request, TokenHandler $tokenHandler)
    {
        if ($tokenHandler->removeToken($request->input('api_token'))) {
            return $this->success([]);
        } else {
            return $this->error(Lang::get('messages.logout_fail'));
        }
    }

$currentUser = app(\App\Contracts\TokenHandler::class)->getTokenUser($request->input('api_token'));