[Qgis-developer] [processing] Get canvas CRS from Processing script

[Spencer Gardner]

I'm creating a Processing plugin for which one of the inputs for one of the
tools is a CRS. I'd like to use the CRS from the map canvas as the default
for this parameter but I can't figure out whether this is possible.

My main problem seems to be that the ParameterCrs object is created when
the plugin is first loaded (when QGIS is initialized), so if I parse the
authid() of the map canvas when the plugin loads, it automatically sets to
4326. I can't figure out whether there's a way to re-initialize this
parameter with a different CRS when I actually click on the tool.

Is this technically impossible within the current framework? How can I
accomplish this?

Thanks,
Spencer
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