alternative to www when no writing authorization

[Stéphane Laurent]

Hello, 

I have a Shiny app creating a pdf file and I embed it like that:

tags$object(data="myplot.pdf", type="application/pdf", width="550px", 

                                          height="400px")

It works if myplot.pdf is in the www subfolder, otherwise it does not work (even by specifying the full path of the file). This is problematic because I use the Shniy Server in my company and the user has not authorization to write on the server. 

[Joe Cheng]

Does the downloading feature not work for your case?

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[Stéphane Laurent]

Yes of course the downloadhandler works. But I want a pdf preview in the app.

[Joe Cheng]

(oops, dropped shiny-discuss from my last reply accidentally)

You could also (ab)use addResourcePath, I suppose. Map a URL to a temp dir.

On Thu, Oct 24, 2013 at 9:50 AM, Joe Cheng <j...@rstudio.com> wrote:

Oh sorry, I misread tags$object as being a link. I get it now.

Maybe if you encode the PDF into a data URI and use that as the data?

uri <- paste0("data:application/pdf;base64,", base64encode(readBin(file, "raw", n=file.info(file)$size)))

Pretty sure this would not work on IE though, so if you need that then it's a problem.

[Stéphane Laurent]

Thank you very much. I will soon try your suggestions. 
But using tags$object(),  I'm not sure the pdf preview will be updated if the pdf file changes ?

[Joe Cheng]

Not automatically, no. You'll need to regenerate the object tag, probably, using renderText with htmlOutput or whatever. If you're going to overwrite the same PDF file over and over, then I recommend you append some random bytes as a querystring, like http://foo/bar/output.pdf?nonce=23908432984