first draft for a simple hooks based custom attribute storage, with a BytesFileSystemStorage POC implementation. Basically: * a dictionary contains maps from which attribute of which entity types are mapped to which custom storage * hooks check for one of these entity type being added/modified/deleted * read is based on the sql generator callback mecanism (used in vcsfile for instance) * all storages have the same basic interface (read, add, update, delete), and should be pluggable in a transparent way (except at migration time when one want to change from a storage to another) * the sample BytesFileSystemStorage: * may store Bytes attributes content of any entity type as file on the file system * is based on one FSPATH rql/sql function and another _fsopen only available in sql * has a dumb file name allocation algorithm

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[system]

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adapter=native

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# database driver (postgres or sqlite)

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db-driver=sqlite

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# database host

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db-host=

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# database name

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db-name=tmpdb

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# database user

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db-user=admin

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# database password

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db-password=gingkow

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# database encoding

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db-encoding=utf8

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[admin]

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login = admin

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password = gingkow

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[ldapuser]

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adapter=ldapuser

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# ldap host

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host=ldap

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# base DN to lookup for usres

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user-base-dn=ou=People,dc=logilab,dc=fr

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# user search scope

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user-scope=ONELEVEL

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# classes of user

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user-classes=top,posixAccount

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# attribute used as login on authentication

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user-login-attr=uid

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# name of a group in which ldap users will be by default

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user-default-group=users

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# map from ldap user attributes to cubicweb attributes

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user-attrs-map=gecos:email,uid:login