在前端下载 Excel (.xlsx) 文件 Javascript 通过亚马逊预签名 URL

Question

I have an amazon S3 URL being passed back to me from an external service that is in the format:

https://foo.s3.amazonaws.com/ProjectDownloads/foo/title.xlsx?AWSAccessKeyId=foo&Expires=1602279238&Signature=foo

I haven't worked much with S3, but my understanding is this is a Presigned URL - I can paste it in my browser and the excel file downloads.

How can I download this file directly using javascript (on the frontend, as my system is not running node)?

I have tried generating an tag element with click - however all my files download as corrupt. I can download the file directly by pasting the link in my browser and it auto initiates a download.

Any help will be appreciated.

I have tried the following, but it downloads a file with error:

    var link = document.createElement('a');
    link.href = url;
    link.download = 'foo.xlsx';
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);

Answer 1

You don't need JS to force a download on clicking the link; you can do this with just HTML. And, it doesn't matter that the source is a presigned S3 URL - it works with any URL.

<a href=“Foo.xlsx” download>click to download</a> should do it for you.

Have a look at https://www.w3schools.com/howto/howto_html_download_link.asp for the browser support matrix.