Header Issue with S3 PUT Command - php

Question

I'm trying to do a server-less upload to S3 using DropzoneJS. I'm having issues with the AWS Presigned URL specifically, where it's indicating that the x-amz-acl header is unsigned.
Javascript:
var dz = new Dropzone("div#upload", {
url: "tbd",
paramName: "file", // The name that will be used to transfer the file
maxFilesize: 2, // MB
accept: this.getUploadUrl,
method: 'put',
sending: function(file, xhr) {
var _send = xhr.send;
xhr.setRequestHeader('x-amz-acl', 'public-read');
xhr.send = function() {
_send.call(xhr, file);
}
},
});
dz.on('processing', function(file) {
// change url before sending
this.options.url = file.uploadUrl;
});
function getUploadUrl(file, cb) {
var params = {
fileName: file.name,
fileType: file.type,
};
$.getJSON('signput.php', params).done(function(data) {
var decodedUri = decodeURIComponent(data['signedRequest']);
if (!data.signedRequest) {
return cb('Failed to receive an upload url');
}
console.log(decodedUri);
file.uploadUrl = decodedUri;
cb();
}).fail(function() {
return cb('Failed to receive an upload url');
});
}
PHP (called to get presigned url):
$fileName = $_GET['fileName'];
$s3Client = new Aws\S3\S3Client([
'version' => '2006-03-01',
'region' => 'us-west-2',
'credentials' => [
'key' => '__MY__KEY__',
'secret' => '__MY__SECRET__',
],]);
$cmd = $s3Client->getCommand('PutObject', [
'Bucket' => '__MY__BUCKET__',
'Key' => $fileName
]);
$request = $s3Client->createPresignedRequest($cmd, '+20 minutes');
// Get the actual presigned-url
$url = (string) $request->getUri();
$urlArray['signedRequest'] = $url;
$urlArray = json_encode($urlArray);
echo $urlArray;
I've also tried setting x-amz-acl to public-read in the Dropzone headers and S3 getCommand, but it's not working.
The error I get:
<?xml version="1.0" encoding="UTF-8"?>
<Error><Code>AccessDenied</Code>
<Message>There were headers present in the request which were not signed</Message>
<HeadersNotSigned>x-amz-acl</HeadersNotSigned>
</Error>

Answer 1

There was one issue - I needed to move the ACL => 'public-read' from the JS code into the signing request.
The Dropzone sending function turns into this:
sending: function(file, xhr) {
var _send = xhr.send;
xhr.send = function() {
_send.call(xhr, file);
}
}
And the PHP signing requests turns into:
$cmd = $s3Client->getCommand('PutObject', [
'Bucket' => '__MY__BUCKET__',
'Key' => $fileName,
'ACL' => 'public-read'
]);
Thanks to Michael for pointing me in the right direction.
Final code for reference...
Javascript:
var dz = new Dropzone("div#upload", {
url: "tbd",
paramName: "file", // The name that will be used to transfer the file
maxFilesize: 2, // MB
accept: this.getUploadUrl,
method: 'put',
sending: function(file, xhr) {
var _send = xhr.send;
xhr.send = function() {
_send.call(xhr, file);
}
},
});
dz.on('processing', function(file) {
// change url before sending
this.options.url = file.uploadUrl;
});
function getUploadUrl(file, cb) {
var params = {
fileName: file.name,
fileType: file.type,
};
$.getJSON('signput.php', params).done(function(data) {
var decodedUri = decodeURIComponent(data['signedRequest']);
if (!data.signedRequest) {
return cb('Failed to receive an upload url');
}
file.uploadUrl = decodedUri;
cb();
}).fail(function() {
return cb('Failed to receive an upload url');
});
}
PHP:
$fileName = $_GET['fileName'];
$s3Client = new Aws\S3\S3Client([
'version' => '2006-03-01',
'region' => 'us-west-2',
'credentials' => [
'key' => '__MY_KEY__',
'secret' => '__MY_SECRET__,
],]);
$cmd = $s3Client->getCommand('PutObject', [
'Bucket' => '__MY_BUCKET__',
'Key' => $fileName,
'ACL' => 'public-read'
]);
$request = $s3Client->createPresignedRequest($cmd, '+20 minutes');
// Get the actual presigned-url
$url = (string) $request->getUri();
$urlArray['signedRequest'] = $url;
$urlArray = json_encode($urlArray);
echo $urlArray;