How do I download a file?

[Sanket Dasgupta]

I am currently developing a gmail addon. I have a button in the contextual trigger pane that calls an action, In this action's callback function:

Can I download a file (whose whole binary data I have) in the browser? Is there any API that allows you to do so? I am aware of making my own download endpoint in my own server, but right now since I have the whole blob, I want to download it in the browser itself.

I have tried using ContentService.createTextOutput(StringData).downloadAsFile() but this does not work. Even if it does work for text files, it would not work for other binary files would it?

Also, can CacheService can be used for this?

[Martin Hawksey]

Is the file generated in the browser by another site. 

On Fri, 7 Jun 2019, 14:36 Sanket Dasgupta, <ben10...@gmail.com> wrote:

Can I download a file (whose whole binary data I have) in the browser? Is there any API that allows you to do so? I am aware of making my own download endpoint in my own server, but right now since I have the whole blob, I want to download it in the browser itself.

I have tried using ContentService.createTextOutput(StringData).downloadAsFile() but this does not work. Even if it does work for text files, it would not work for other binary files would it?

Also, can CacheService can be used for this?

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[Sanket Dasgupta]

Hi Martin, yes, if you are asking about the binary data of the file, it is retrieved from a different site.

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[Martin Hawksey]

Is there a url to directly access the file? If so you can get the file with Apps Script using UrlFetch https://developers.google.com/apps-script/reference/url-fetch/url-fetch-app

If there isn't a URL you can use then this is probably beyond the capabilities of Apps Script

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[Sanket Dasgupta]

Right, that makes sense. But would doing this download the actual file? It would just store it in the response object returned by the method call. How do I make the browser download this?

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[Martin Hawksey]

The highlighted code here might be able to do what you are looking for https://gist.github.com/denilsonsa/8134679#file-url_to_drive-js-L38-L98

In you Apps Script project you'd include the code and then call the following (replacing "YOUR_URL_HERE", "DRIVE_FOLDER_ID", "FILE_NAME" with your values)

uploadToDrive("YOUR_URL_HERE", "DRIVE_FOLDER_ID", "FILE_NAME");