<?php
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namespace addons\alioss\library;
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use app\common\library\Upload;
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class Auth
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{
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public function __construct()
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{
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}
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public function params($name, $md5, $callback = true)
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{
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$config = get_addon_config('alioss');
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$callback_param = array(
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'callbackUrl' => isset($config['notifyurl']) ? $config['notifyurl'] : '',
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'callbackBody' => 'filename=${object}&size=${size}&mimeType=${mimeType}&height=${imageInfo.height}&width=${imageInfo.width}',
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'callbackBodyType' => "application/x-www-form-urlencoded"
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);
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$base64_callback_body = base64_encode(json_encode($callback_param));
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$now = time();
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$end = $now + $config['expire']; //设置该policy超时时间是10s. 即这个policy过了这个有效时间，将不能访问
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$expiration = $this->gmt_iso8601($end);
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preg_match('/(\d+)(\w+)/', $config['maxsize'], $matches);
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$type = strtolower($matches[2]);
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$typeDict = ['b' => 0, 'k' => 1, 'kb' => 1, 'm' => 2, 'mb' => 2, 'gb' => 3, 'g' => 3];
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$size = (int)$config['maxsize'] * pow(1024, isset($typeDict[$type]) ? $typeDict[$type] : 0);
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//最大文件大小.用户可以自己设置
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$condition = array(0 => 'content-length-range', 1 => 0, 2 => $size);
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$conditions[] = $condition;
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//表示用户上传的数据,必须是以$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
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//$start = array(0 => 'starts-with', 1 => '$key', 2 => $dir);
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//$conditions[] = $start;
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$arr = array('expiration' => $expiration, 'conditions' => $conditions);
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$policy = base64_encode(json_encode($arr));
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$signature = base64_encode(hash_hmac('sha1', $policy, $config['accessKeySecret'], true));
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$key = (new Upload())->getSavekey($config['savekey'], $name, $md5);
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$key = ltrim($key, "/");
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$response = array();
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$response['id'] = $config['accessKeyId'];
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$response['key'] = $key;
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$response['policy'] = $policy;
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$response['signature'] = $signature;
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$response['expire'] = $end;
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$response['callback'] = '';
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return $response;
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}
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public function check($signature, $policy)
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{
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$config = get_addon_config('alioss');
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$sign = base64_encode(hash_hmac('sha1', $policy, $config['accessKeySecret'], true));
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return $signature == $sign;
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}
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private function gmt_iso8601($time)
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{
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$dtStr = date("c", $time);
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$mydatetime = new \DateTime($dtStr);
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$expiration = $mydatetime->format(\DateTime::ISO8601);
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$pos = strpos($expiration, '+');
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$expiration = substr($expiration, 0, $pos);
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return $expiration . "Z";
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}
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}
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