yueke/application/api/controller/Upload.php

<?php

namespace app\api\controller;

use app\common\controller\Api;
use think\Db;

/**
 * oss上传接口
 */
class Upload extends Api
{
    protected $noNeedLogin = ['gmt_iso8601','signedUrl','callBack'];
    protected $noNeedRight = ['*'];

    public function gmt_iso8601($time) {
        $expiration = date(DATE_ISO8601,$time);
        $pos = strpos($expiration, '+');
        $expiration = substr($expiration, 0, $pos);
        return $expiration."Z";
    }

    /**
     * 获取签名
     * @return array
     */
    public function signedUrl(){
        $config = config("oss");
        $id= $config["secretId"];  // 请填写您的AccessKeyId。
        $key= $config["secretKey"]; // 请填写您的AccessKeySecret。
        // $host的格式为 bucketname.endpoint，请替换为您的真实信息。（在阿里云中可配置）
        $host =  $config["bucket"].".".$config["endPoint"];
        // $callbackUrl为上传回调服务器的URL，请将下面的IP和Port配置为您自己的真实URL信息。下面有callBack方法
        $callbackUrl = config('website_url').'/api/upload/callBack';
        $dir = 'images/';          // 用户上传文件时指定的前缀。
        $dir = 'uploads/'.date('Ymd').'/';          // 用户上传文件时指定的前缀。

        $callback_param = array('callbackUrl'=>$callbackUrl,
            'callbackBody'=>'filename=${object}&size=${size}&mimeType=${mimeType}&height=${imageInfo.height}&width=${imageInfo.width}',
            'callbackBodyType'=>"application/x-www-form-urlencoded");
        $callback_string = json_encode($callback_param);

        $base64_callback_body = base64_encode($callback_string);
        $now = time();
        $expire = 3000;  //设置该policy超时时间是10s. 即这个policy过了这个有效时间，将不能访问。
        $end = $now + $expire;
        $expiration = $this->gmt_iso8601($end);

        //最大文件大小.用户可以自己设置
        $condition = array(0=>'content-length-range', 1=>0, 2=>1048576000);
        $conditions[] = $condition;

        // 表示用户上传的数据，必须是以$dir开始，不然上传会失败，这一步不是必须项，只是为了安全起见，防止用户通过policy上传到别人的目录。
        $start = array(0=>'starts-with', 1=>'$key', 2=>$dir);
        $conditions[] = $start;
        $arr = array('expiration'=>$expiration,'conditions'=>$conditions);
        $policy = json_encode($arr);
        $base64_policy = base64_encode($policy);
        $string_to_sign = $base64_policy;
        $signature = base64_encode(hash_hmac('sha1', $string_to_sign, $key, true));

        $response = [];
        $response['accessid'] = $id;
//        $response['host'] = $host;
        $response['policy'] = $base64_policy;
        $response['signature'] = $signature;
//        $response['expire'] = $end;
//        $response['callback'] = $base64_callback_body;
//        $response['dir'] = $dir;  // 这个参数是设置用户上传文件时指定的前缀。
        $response['bucket'] = $config["url"];
        $response['fileurl'] = 'uploads/'.date('Ymd').'/';


        $this->success("获取成功！",$response);
    }

    //回调函数
    public function callBack(){
        header("Content-Type: application/json");
        $data = array("Status"=>"Ok",'data'=>$_POST);
        echo json_encode($data);
    }
}