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<?php
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namespace ali\oss;
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use think\facade\Request;
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class ServiceSign extends Base
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{
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/**
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* 服务端签名直传并设置上传回调
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* @date 2021-03-01
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*/
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public function getOssSignature()
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{
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//定义文件名称
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$file_name = date('Ymd') . '/' . md5(microtime(true));
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$callback_param = [
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'callbackUrl' => Request::domain() . '/index.php/base/oss/platform/Callback/fileDelete', //callbackUrl为回调服务器地址，如http://oss-demo.aliyuncs.com:23450或http://127.0.0.1:9090
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'callbackBody' => 'bucket=${bucket}&object=${object}&show_url_domain=${show_url_domain}',
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'callbackBodyType' => "application/x-www-form-urlencoded"
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];
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$callback_string = json_encode($callback_param);
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$base64_callback_body = base64_encode($callback_string);
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$now = time();
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$expire = 900; //设置该policy超时时间是10s. 即这个policy过了这个有效时间，将不能访问。
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$end = $now + $expire;
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$expiration = $this->gmtIso8601($end);
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$conditions = [
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// 指定所允许上传的文件最大和最小范围，例如允许的文件大小为1~10字节，则可以写为["content-length-range", 1, 10] 1048576000字节 = 1000M
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[0 => 'content-length-range', 1 => 0, 2 => 1048576000],
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[0 => 'starts-with', 1 => '$key', 2 => $this->config['first_directory']]// 表示用户上传的数据，必须是以$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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];
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$policy = array('expiration' => $expiration, 'conditions' => $conditions);
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$policy = json_encode($policy);
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$base64_policy = base64_encode($policy);
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$string_to_sign = $base64_policy;
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$signature = base64_encode(hash_hmac('sha1', $string_to_sign, $this->config['access_key_secret'], true));
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$response = [
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'accessid' => $this->config['access_key_id'],
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'host' => $this->config['bucket_default_url'],
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'policy' => $base64_policy,
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'signature' => $signature,
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'expire' => $end,
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// 'callback' => $base64_callback_body,
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'dir' => $this->config['first_directory'] . '/uid' . $this->config['uid'] . '/api/', // 这个参数是设置用户上传文件时指定的前缀。
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'show_host' => $this->config['show_url']
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];
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// $response['showUrlDomain'] = $this->config['access_id'];
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return $response;
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}
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private function gmtIso8601($time)
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{
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$dtStr = date("c", $time);
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$pos = strpos($dtStr, '+');
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$expiration = substr($dtStr, 0, $pos);
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return $expiration . ".000Z";
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}
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//
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// private function gmtIso8601($time) {
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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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