Started working on add/remove user support

state/apiserver/common/password.go

 // Copyright 2013 Canonical Ltd.
 // Licensed under the AGPLv3, see LICENCE file for details.
 
 package common
 
 import (
         "launchpad.net/juju-core/log"
         "launchpad.net/juju-core/state"
         "launchpad.net/juju-core/state/api/params"
 )
 
 // PasswordChanger implements a common SetPasswords method for use by
 // various facades.
 type PasswordChanger struct {
         st           state.EntityFinder
         getCanChange GetAuthFunc
 }
 
 // NewPasswordChanger returns a new PasswordChanger. The GetAuthFunc will be
 // used on each invocation of SetPasswords to determine current permissions.
 func NewPasswordChanger(st state.EntityFinder, getCanChange GetAuthFunc) *PasswordChanger {
         return &PasswordChanger{
                 st:           st,
                 getCanChange: getCanChange,
         }
 }
 
 // SetPasswords sets the given password for each supplied entity, if possible.
-func (pc *PasswordChanger) SetPasswords(args params.PasswordChanges) (params.ErrorResults, error) {
+func (pc *PasswordChanger) SetPasswords(args params.EntityPasswords) (params.ErrorResults, error) {
         result := params.ErrorResults{
                 Results: make([]params.ErrorResult, len(args.Changes)),
         }
         if len(args.Changes) == 0 {
                 return result, nil
         }
         canChange, err := pc.getCanChange()
         if err != nil {
                 return params.ErrorResults{}, err
         }
@@ skipping 48 matching lines @@
                                 break
                         }
                 }
         }
         if err == nil {
                 err = entity.SetPassword(password)
                 log.Infof("setting password for %q", tag)
         }
         return err
 }