我在AWS s3存储桶中上传了一个文件,并将该文件设置为公共权限。我想在我的Facebook上分享该文件..事情是我可以复制该公共链接并分享它。但我也希望下载的计数存储..以其他方式我想在我的网络托管中托管一个php文件,其中将有一个标签,如栏,其中文件名,文件大小,下载链接和总下载次数将在那里 。请帮我解释一下代码
我尝试了以下从谷歌搜索获得的代码,但没有使用
<?php
$aws_key = '_YOUR_AWS_KEY_000000';
$aws_secret = '_your_aws_secret_00000000000000000000000';
$aws_bucket = 'anyexample-test'; // AWS bucket
$aws_object = 'test.png'; // AWS object name (file name)
if (strlen($aws_secret) != 40) die("$aws_secret should be exactly 40 bytes long");
$dt = gmdate('r'); // GMT based timestamp
// preparing string to sign
$string2sign = "GET
{$dt}
/{$aws_bucket}/{$aws_object}";
// preparing HTTP query
$query = "GET /{$aws_bucket}/{$aws_object} HTTP/1.1
Host: s3.amazonaws.com
Connection: close
Date: {$dt}
Authorization: AWS {$aws_key}:".amazon_hmac($string2sign)."\n\n";
echo "Downloading: http://s3.amazonaws.com/{$aws_bucket}/{$aws_object}\n";
list($header, $resp) = downloadREST($fp, $query);
echo "\n\n";
if (strpos($header, '200 OK') === false) // checking for error
die($header."\r\n\r\n".$resp);
$aws_object_fs = str_replace('/', '_', $aws_object);
// AWS object may contain slashes. We're replacing them with underscores
@$fh = fopen($aws_object_fs, 'wb');
if ($fh == false)
die("Can't open file {$aws_object_fs} for writing. Fatal error!\n");
echo "Saving data to {$aws_object_fs}...\n";
fwrite($fh, $resp);
fclose($fh);
// Sending HTTP query, without keep-alive support
function downloadREST($fp, $q)
{
// opening HTTP connection to Amazon S3
// since there is no keep-alive we open new connection for each request
$fp = fsockopen("s3.amazonaws.com", 80, $errno, $errstr, 30);
if (!$fp) die("$errstr ($errno)\n"); // connection failed, pity
fwrite($fp, $q); // sending query
$r = ''; // buffer for result
$check_header = true; // header check flag
$header_end = 0;
while (!feof($fp)) {
$r .= fgets($fp, 256); // reading response
if ($check_header) // checking for header
{
$header_end = strpos($r, "\r\n\r\n"); // this is HTTP header boundary
if ($header_end !== false)
$check_header = false; // We've found it, no more checking
}
}
fclose($fp);
$header_boundary = $header_end+4; // 4 is length of "\r\n\r\n"
return array(substr($r, 0, $header_boundary), substr($r, $header_boundary));
}
// hmac-sha1 code START
// hmac-sha1 function: assuming key is global $aws_secret 40 bytes long
// http://en.wikipedia.org/wiki/HMAC
// warning: key is padded to 64 bytes with 0x0 after first function call
// hmac-sha1 function
function amazon_hmac($stringToSign)
{
if (!function_exists('binsha1'))
{ // helper function binsha1 for amazon_hmac (returns binary value of sha1 hash)
if (version_compare(phpversion(), "5.0.0", ">=")) {
function binsha1($d) { return sha1($d, true); }
} else {
function binsha1($d) { return pack('H*', sha1($d)); }
}
}
global $aws_secret;
if (strlen($aws_secret) == 40)
$aws_secret = $aws_secret.str_repeat(chr(0), 24);
$ipad = str_repeat(chr(0x36), 64);
$opad = str_repeat(chr(0x5c), 64);
$hmac = binsha1(($aws_secret^$opad).binsha1(($aws_secret^$ipad).$stringToSign));
return base64_encode($hmac);
}
// hmac-sha1 code END
?>
答案 0 :(得分:1)
我建议使用官方AWS SDK for PHP,因为它具有为您实现的所有请求签名和处理逻辑。以下是SDK开发人员提供的与您正在做的事情相关的文章:Streaming Amazon S3 Objects From a Web Server
答案 1 :(得分:0)
事实上,如果您只需要查看下载次数,就可以在不使用php运行自己的服务器的情况下实现此目的。
如果您启用,此信息已在S3存储桶日志中提供。这将更加准确,因为如果用户直接使用S3链接并共享/下载,则在PHP方法中无法跟踪下载。
虽然这些日志很难解析,但https://qloudstat.com和http://www.s3stat.com/等服务对此有帮助。
另一点:如果您在S3存储桶前启用CDN - Cloudfront,下载速度会快得多。