rga not working under R Sweave

[HanWang-HiWorld]

I am working on generating report with R Sweave. When I try to fetch data from google reporting api rga.open(instance="ga"), error occurs (chunk 1) object 'redirect.uri' not found. I have been using rga under R and base RStudio environment with no problems. Does anyone know how to solve this issue under R Sweave environment?

[jdeboer]

I'm wondering if this issue may be related to the OAuth handshake when obtaining an authorisation token? Usually the handshake is performed in a way that requires an interactive R session and involvement of the user. However, there may be a way to perform the handshake non-interactively, perhaps using a Google APIs Service Account. Thoughts?