我需要制作一个网页表单，可以使用PHP从浏览器直接上传多个文件到我的AWS S3存储桶中。
我找到了一个不错的解决方案来处理单个文件上传(https://www.sanwebe.com/2015/09/direct-upload-to-amazon-aws-s3-using-php-html)。
我找到了一个不错的解决方案来处理单个文件上传(https://www.sanwebe.com/2015/09/direct-upload-to-amazon-aws-s3-using-php-html)。
<?php
$access_key = "iam-user-access-key"; //Access Key
$secret_key = "iam-user-secret-key"; //Secret Key
$my_bucket = "mybucket"; //bucket name
$region = "us-east-1"; //bucket region
$success_redirect = 'http://'. $_SERVER['SERVER_NAME'] . $_SERVER['REQUEST_URI']; //URL to which the client is redirected upon success (currently self)
$allowd_file_size = "1048579"; //1 MB allowed Size
//dates
$short_date = gmdate('Ymd'); //short date
$iso_date = gmdate("Ymd\THis\Z"); //iso format date
$expiration_date = gmdate('Y-m-d\TG:i:s\Z', strtotime('+1 hours')); //policy expiration 1 hour from now
//POST Policy required in order to control what is allowed in the request
//For more info http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-HTTPPOSTConstructPolicy.html
$policy = utf8_encode(json_encode(array(
'expiration' => $expiration_date,
'conditions' => array(
array('acl' => 'public-read'),
array('bucket' => $my_bucket),
array('success_action_redirect' => $success_redirect),
array('starts-with', '$key', ''),
array('content-length-range', '1', $allowd_file_size),
array('x-amz-credential' => $access_key.'/'.$short_date.'/'.$region.'/s3/aws4_request'),
array('x-amz-algorithm' => 'AWS4-HMAC-SHA256'),
array('X-amz-date' => $iso_date)
))));
//Signature calculation (AWS Signature Version 4)
//For more info http://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-authenticating-requests.html
$kDate = hash_hmac('sha256', $short_date, 'AWS4' . $secret_key, true);
$kRegion = hash_hmac('sha256', $region, $kDate, true);
$kService = hash_hmac('sha256', "s3", $kRegion, true);
$kSigning = hash_hmac('sha256', "aws4_request", $kService, true);
$signature = hash_hmac('sha256', base64_encode($policy), $kSigning);
?>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Aws S3 Direct File Uploader</title>
</head>
<body>
<form action="http://<?= $my_bucket ?>.s3.amazonaws.com/" method="post" enctype="multipart/form-data">
<input type="hidden" name="key" value="${filename}" />
<input type="hidden" name="acl" value="public-read" />
<input type="hidden" name="X-Amz-Credential" value="<?= $access_key; ?>/<?= $short_date; ?>/<?= $region; ?>/s3/aws4_request" />
<input type="hidden" name="X-Amz-Algorithm" value="AWS4-HMAC-SHA256" />
<input type="hidden" name="X-Amz-Date" value="<?=$iso_date ; ?>" />
<input type="hidden" name="Policy" value="<?=base64_encode($policy); ?>" />
<input type="hidden" name="X-Amz-Signature" value="<?=$signature ?>" />
<input type="hidden" name="success_action_redirect" value="<?= $success_redirect ?>" />
<input type="file" name="file" />
<input type="submit" value="Upload File" />
</form>
<?php
//After success redirection from AWS S3
if(isset($_GET["key"]))
{
$filename = $_GET["key"];
$ext = pathinfo($filename, PATHINFO_EXTENSION);
if(in_array($ext, array("jpg", "png", "gif", "jpeg"))){
echo '<hr />Image File Uploaded : <br /><img src="//'.$my_bucket.'.s3.amazonaws.com/'.$_GET["key"].'" style="width:100%;" />';
}else{
echo '<hr />File Uploaded : <br /><a href="http://'.$my_bucket.'.s3.amazonaws.com/'.$_GET["key"].'">'.$filename.'</a>';
}
}
?>
</body>
</html>
它在其目的上表现很好，但我需要一个能够同时上传多个文件的解决方案。
页面上的一条评论指出了一种方法：
如果直接上传到S3，则AWS仅允许您一次上传一个文件。您可以通过将文件输入设置为“多个”并循环遍历每个文件来进行多文件上传，通过AJAX进行多次提交。要做到这一点，您需要在要上传的存储桶上设置CORS，否则，您将被拒绝因为这是一个跨站脚本。正如我刚刚在自己的项目中使其工作的那样，它是可以实现的。
我正在尝试跟随，但不确定他具体提议使用AJAX来使其工作。表单是否在AJAX请求页面上，我只需向其提供文件名即可？
请熟悉此问题的人更详细地向我解释，或者将我引导至其他解决方案。