This adds some initial support for using $filter (as defined in the
odata spec) on the /users endpoint. Currently the following filters are
supported:
A single filter on `id` property of the `memberOf` relation of users.
To list all users that are members of a specific group:
```
curl 'https://localhost:9200/graph/v1.0/users?$filter=memberOf/any(m:m/id eq '262982c1-2362-4afa-bfdf-8cbfef64a06e')
```
A logical AND filteri on the `id` property of the `memberOf` relation of users.
`$filter=memberOf/any(m:m/id eq 262982c1-2362-4afa-bfdf-8cbfef64a06e) and memberOf/any(m:m/id eq 6040aa17-9c64-4fef-9bd0-77234d71bad0)`
This will cause at least two queries on the identity backend. The `and`
operation is performed locally.
Closes: #5487
In preparation for some more advanced queries pass the parse odata request
tVo the identity backend methods instead of the raw url.Values{}. This also
add some helpers for validating $expand and $search queries to reject
some unsupported queries.
Also remove support for `$select=memberOf` and `$select=drive|drives` queries
and stick to the technically correct `$expand=...`.
Consolidate all services to use the Reva config struct for the shared package.
This works because all services (except 'notifications', 'thumbnails' and
'webdav') where using the same config keys and environment variables for
setting the reva gateway.
