[FEATURE] Restore TapHandle functionnality: DataLink

[lmichel]

Some tables contain URLs on DataLink endpoints instead of direct links to data products.

DataLink is a VO protocol providing an access to a set of data or services attached to a given product.

• JSResource embeds a DataLinks Browser that must be reused.

[lmichel]

DataLink endpoints can be found on CAOM (CADC) and GAVO Obscore tables.

[lmichel]

This issue must be addressed once the registry search tool is working

[lmichel]

Run the following query (after #120 is fixed)

SELECT  TOP 100  ivoa.obscore.access_url,ivoa.obscore.access_format,ivoa.obscore.dataproduct_type
FROM ivoa.obscore
WHERE      ivoa.obscore.dataproduct_type = 'image' AND ivoa.obscore.access_format LIKE '%datalink%' 

And look at what TapHandle (the old one) works.
Try to do the same

[lmichel]

Network test on TapHandle (https://ws.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/argus/)
Click on the icon:

http://saada.unistra.fr/taphandle/forwardxmlresource?target=https%3A%2F%2Fws.cadc-ccda.hia-iha.nrc-cnrc.gc.ca%2Fcaom2ops%2Fdatalink%3Frunid%3Dq952a7mnln9odv9r%26ID%3Divo%253A%252F%252Fcadc.nrc.ca%252FGEMINI%253FGN-2014B-Q-35-158-011%252FN20141022S0180

The data link response the invoked through a proxy

Click on #this

https://ws-uv.canfar.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-ZmlkPU4yMDE0MTAyMlMwMTgwLmZpdHMmY2xuPTQyMTM0NDAmY21kPTZiYTBiNWMwYWY0ZjA2NGJlMTc5ODQ3YmY0N2NjMTI2JmN0eT1hcHBsaWNhdGlvbiUyRmZpdHMmbG1kPTE1NDA1Nzg0MTEwMDAmdWxuPTQyMTM0NDAmdW1kPTZiYTBiNWMwYWY0ZjA2NGJlMTc5ODQ3YmY0N2NjMTI2-0907360d88c22796d9c6c5455549235a/N20141022S0180.fits

We fetch data on another location, likely through some 3xx

The only way we have to handle this is to rely on our proxy.

• replace (or override) any call to http://saada.unistra.fr/taphandle/forwardxmlresource by direct accesses possibly redirected to tapxy.