七牛fetch

fetch ak sk
/*
*
* @desc URL安全形式的base64编码
* @param string $str
* @return string
*/


function urlsafe_base64_encode($str){
$find = array("+","/");
$replace = array("-", "_");
return str_replace($find, $replace, base64_encode($str));
}

/**
* generate_access_token
*
* @desc 签名运算
* @param string $access_key
* @param string $secret_key
* @param string $url
* @param array $params
* @return string
*/
function generate_access_token($access_key, $secret_key, $url, $params = ''){
$parsed_url = parse_url($url);
$path = $parsed_url['path'];
$access = $path;
if (isset($parsed_url['query'])) {
$access .= "?" . $parsed_url['query'];
}
$access .= "\n";
if($params){
if (is_array($params)){
$params = http_build_query($params);
}
$access .= $params;
}
$digest = hash_hmac('sha1', $access, $secret_key, true);
return $access_key.':'.urlsafe_base64_encode($digest);
}
function send($url, $header = '') {
$curl = curl_init($url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_HEADER,1);
curl_setopt($curl, CURLOPT_HTTPHEADER, $header);
// curl_setopt($curl, CURLOPT_POST, 1);

$con = curl_exec($curl);

if ($con === false) {
echo 'CURL ERROR: ' . curl_error($curl);
} else {
return $con;
}
}
//七牛抓取图片
function fetch($url,$bucket = 'frakin'){
//后缀名
$extension = substr($url, strrpos($url, '.') + 1);
$fetch = urlsafe_base64_encode($url);
$time = date("Ymd");
$uniqid = uniqid();
$key = 'image_'.$time.'_'.$uniqid.'.'.$extension;
$enurl = $bucket.':'.$key;
$to = urlsafe_base64_encode($enurl);
$url = 'http://iovip.qbox.me/fetch/'. $fetch .'/to/' . $to;
$access_key = '';
$secret_key = '';
$access_token = generate_access_token($access_key, $secret_key, $url);
$header[] = 'Content-Type: application/json';
$header[] = 'Authorization: QBox '. $access_token;
$con = send('iovip.qbox.me/fetch/'.$fetch.'/to/'.$to, $header);
return "http://dn-".$bucket.".qbox.me/image_".$time.'_'.$uniqid.'.'.$extension;
}

//fetch('http://www.baidu.com/image/20150806/1438832727201450.png');
?>

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