如何在不使用官方PHP SDK临时保存文件系统的情况下将base64编码的图像上传到Amazon S3？

Question

I have a "screenshot" of a div using a javascript library named html2canvas . It returns the "screenshot" as base 64 encoded image which I then pass to my PHP server using AJAX. The server will then temporarily save the image at the file system, upload the image to Amazon S3 and then immediately delete the file. It works, but I would like to see if it is possible to upload the image directly without saving to file system.

I know that there is a way to directly upload image through client side javascript , but I don't want to enable CORS. Also, I have found a solution for Node.js , so I guess there got to be a way to do it in PHP as well.

I noticed that there are somebody asking similar question , but there are no answer to that question, and the situation is a bit different, as I am using the official PHP SDK with the official service provider for laravel

So, is there a way I can directly upload a base64 encoded image to Amazon S3 without temporarily saving on file system?

Answer 1

Skip this step if your string is the correct output, but if you need to "save" from a GD image, then you can save the image to string using ob controls:

ob_start();
imagepng($image);
$pngData = ob_get_clean();
ob_end_clean();

Then you can simply specify Body to upload a string directly, and not a file.

$aParams = [
    'Bucket'     => $bucketName,
    'Key'        => $destName,
    'Body'       => $string,
    'ACL'        => 'public-read'
]);
$result = $s3Client->putObject($aParams);

You can also optionally add image headers etc as you would for uploading the file.