Transferring data to/from PIC

How to provide data access to external users without PIC account

I will use an example for MICE

Steps

1) dCache webdav door that exports your data.

https://webdav-mice.pic.es:8454

2) dCacheView frontend (optional)

https://webdav-mice.pic.es:8464

3) Authentication

Either PIC credentials (user/password) or a macaroon (https://dcache.org/old/manuals/UserGuide-7.0/macaroons.shtml). Any authenticated user can get a macaroon for an external user. Remember to add proper caveats to restrict privileges. In the next example, I retrieve a macaroon with 7 days validity, that can only download and list, and can only access the subtree of the provided URL.

$ curl -u tallada -X POST -H 'Content-Type: application/macaroon-request' \
-d '{"caveats": ["activity:DOWNLOAD,LIST"], "validity": "P7D"}' \
https://webdav-mice.pic.es:8454/tape/raw/production/N4096_L3072_LC3/maps/n8192/kmapgcpy/

{
    "macaroon": "MDA3NWxvJmc2lnbmF0dXJlIJt81Pp8G1KXMH8FqwpWhJtwYnLfUAvNPQuq7bTwNOxGCg",   
}