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auth.php

     format(DateTime::ISO8601);    $pos = strpos($expiration, '+');    $expiration = substr($expiration, 0, $pos);    return $expiration."Z";}//阿里云官方提供的秘钥$id= '6MKOqxGiGU4AUk44';$key= 'ufu7nS8kS59awNihtjSonMETLI0KLy';$host = 'http://post-test.oss-cn-hangzhou.aliyuncs.com';$now = time();$expire = 30; //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 = gmt_iso8601($end);$dir = 'user-dir/';//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 = array();$response['accessid'] = $id;$response['host'] = $host;$response['policy'] = $base64_policy;$response['signature'] = $signature;$response['expire'] = $end;//这个参数是设置用户上传指定的前缀$response['dir'] = $dir;$response['code']=1;echo json_encode(['data'=>$response,'status'=>1]);

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