Save to Drive Button Provided by Google related Problem

Question

I am stuck in my visualforce page where I am including script provide by google to achieve a Save button which below:

<script src="https://apis.google.com/js/platform.js"></script>
<div class="g-savetodrive"
   data-src="https://www.yyy.com/file/path/abc.txt"
   data-filename="My Statement.pdf"
   data-sitename="My Company Name">
</div> 

My Problem is this. When I am providing the url in "data-src" tag and click on button then my file is not upload in my drive I am getting "XHR error" because of different origin because my page loaded at https://www.xxx.com URL and the URL which I am providing in "data-src" is "https://www.yyy.com/file/path/abc.txt". I am assuming this problem is due to different origin.

Google has also provided some steps like put value in header like Access-Control-Allow-Origin: *

https://developers.google.com/drive/web/savetodrive#cors

But I don't know how can I achieve this.

Answer 1

You won't be able to use this library, since neither side of this attempt are under your control (i.e. you cannot change the server's operating parameters to allow these requests). Instead, you'll have to use either the Salesforce AJAX Proxy, or call the API calls from the server itself via Apex Code.