Support gdocs as backend about dataexplorer

[rufuspollock]

@mihi-tr do you mean for read or for write?

[mihi-tr]

both! so I can clean up my google spreadsheets with javascript

read is easy as it's already supported by recline, not sure about the write part though...

[mihi-tr]

This would open transformer to a larger audience, which is good: I think the people using github already might not be the audience for it.

[rufuspollock]

@mihi-tr understand re those already using github but note all you need is a github account (you don't need to be familiar with it!). Will add more about gdocs support above (been thinking about that for a long time)

[rufuspollock]

Read support done in #14.

[rufuspollock]

@mihi-tr so i've looked at this quite a bit more - see https://github.com/rgrp/gdocsjs. The basic issue is that GDocs API does not support CORS so in a pure browser environment there is no direct way to write to a GDocs spreadsheet. Options are a proxy or moving to an extension ...

[mihi-tr]

Interesting, can it be done via JSONP? I'll have a look - does it just not support CORS for writing? Reading works well doesn't it?

[rufuspollock]

@mihi-tr Yes we already have read support done (using JSONP) -- that was done 1+ years ago ;-)

Problem is write support which requires POST or similar for which JSONP is no help :-( -- as you will see the in linked repo and its README CORS is not supported. There's no real way round it directly - see the linked README for discussion of indirect ways round it ...

[rufuspollock]

FIXED. (WONTFIX). Read has been done and write is problematic so WONTFIX - see https://github.com/rgrp/gdocsjs and https://github.com/rgrp/ideas/issues/27 (proxy API for gdocs) for further thoughts.