WMS parsing of THREDDS service

[fmigneault]

Support the new functionality of integrated WMS in Thredds.

[fmigneault]

@huard @dbyrns
Please provide more details about the exact use case, not sure I understood everything.

[huard]

THREDDS provides for each file/dataset a list of services: HTTP, Opendap, NCML, UDDC, ISO, WCS, WMS.

https://pavics.ouranos.ca/twitcher/ows/proxy/thredds/catalog/birdhouse/testdata/flyingpigeon/cmip5/catalog.html?dataset=birdhouse/testdata/flyingpigeon/cmip5/tasmax_Amon_MPI-ESM-MR_rcp45_r2i1p1_200601-200612.nc

A potential use case is to allow anonymous access to the ISO and UDDC services, but private access to all other services.

[dbyrns]

Right now, when we access the twitcher/ows/proxy/thredds the read permissions is check to allow access to the /catalog/{resource} /fileServer/{resource} and /dodsC/{resource} sub-services. We need to ensure that every other sub-services which are now active (see https://pavics.ouranos.ca/twitcher/ows/proxy/thredds/catalog/birdhouse/cmip5/NASA-GISS/GISS-E2-R-CC/rcp85/mon/seaIce/r1i1p1/sic/catalog.html?dataset=birdhouse/cmip5/NASA-GISS/GISS-E2-R-CC/rcp85/mon/seaIce/r1i1p1/sic/sic_OImon_GISS-E2-R-CC_rcp85_r1i1p1_207601-210012.nc) iso, wcs, wms can be accessed the same way.

For now let's use the "read" permission also and @huard will tell us if we need a read_wms, read_wcs, read_opendap, etc. permissions.

[dbyrns]

Ok well, @huard beat me with his post, so at least we will require the read_iso and read_uddc permissions for these two services. read could still be used for the others sub-services unless other needs arise.

[huard]

I don't know if it's useful, but I think we could split services into two categories: metadata access and data access.

Metadata-only access: NCML, ISO, UDDC
Data access: HTTP, Opendap, WCS, WMS

[dbyrns]

Very useful.
I propose 3 permissions then : write, read_metadata, read_data with the subservices mapping provided by @huard .

[fmigneault]

3 permissions for BROWSE metadata and READ/WRITE data are implemented by #361 via PRs #353 and #363