Class description Implements the furnace authentication protocol for CouchDB.
The base URL for the CouchDB database, e.g. http://foo.org:5984/mydatabase
A URL for a view which emits usernames as keys and user documents as values, i.e. something like emit(doc.username, doc). The URL should be relative to base-url (e.g. "_design/my_views/_view/by_username"). The view is not defined automatically by the library.
In order to ensure the uniqueness of user IDs and email addresses, the library creates documents in the database with ids corresponding to these values. These ids are prefixed by the string given as the value for this slot. Ideally, you should guarantee that no other documents in the database can have ids with this prefix. However, the worst that can happen is for someone to falsely be told that a username is taken when it is in fact free.
An assoc taking user slot names to CouchDB document field names. It is not usually necessary to set this slot - it is useful only if you do not wish to use the default field names.