[web2py] implement public, password protected and private view for user

[黄祥]

hi,

i want to learn and implement public, password protected and private
view for user, is there anyone know how to do that?

thank you so much before

e.g.
=== model ===
db.define_table('files',
                Field('title',
                      label = T('Title')
                      ),
                Field('description',
                      'text',
                      label = T('Description')
                      ),
                Field('files',
                      'upload',
                      uploadfield = 'files_data',
                      label = T('Files')
                      ),
                Field('files_data',
                      'blob',
                      label = T('Files Data')
                      ),
                Field('visibility',
                      'list:string',
                      label = T('Visibility')
                      ),
                Field('password',
                      'password',
                      label = T('Password')
                      ),
                auth.signature
                )
db.files.visibility.requires = IS_IN_SET(('Public',
                                          'Private',
                                          'Protected'))
db.files.password.requires = IS_EMPTY_OR(IS_STRONG(min = 6,
                                                   special = 1,
                                                   upper = 1))