Exemplo n.º 1
0
    def loadRoles(self, contentname=""):
        '''
        Loads the roles in the database cluster
        '''
        self.roleProvider = RoleProvider()
        sysRoles = self.roleProvider.GetAllRoles()
        roles = []

        #Load the corresponding roles for the specified content item
        cnt = Content()
        if contentname != "":
            self.currentContent = self.content.queryObject().filter(
                Content.name == contentname).first()
            if self.currentContent:
                roles = [rl.name for rl in self.currentContent.roles]

        #Initialize model
        self.roleMappingsModel = QStandardItemModel(self)
        self.roleMappingsModel.setColumnCount(1)

        #Add role items into the standard item model
        for r in range(len(sysRoles)):
            role = sysRoles[r]
            if role.name != "postgres":
                roleItem = self._createNewRoleItem(role.name)

                #Check if the db role is in the approved for the current content item
                roleIndex = getIndex(roles, role.name)
                if roleIndex != -1:
                    roleItem.setCheckState(Qt.Checked)

                self.roleMappingsModel.appendRow(roleItem)

        self.lstRoles.setModel(self.roleMappingsModel)
Exemplo n.º 2
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    def acceptdlg(self):
        '''
        On user clicking the create user button
        '''
        if self.validateInput():

            roleProvider = RoleProvider()

            try:
                # Create new or update user
                if self.role == None:
                    self._setRole()

                    # Update the db cluster roles as well
                    roleProvider.CreateRole(self.role.name, self.role.description)

                    roleProvider.AddSTDMRole(self.role.name, self.role.description)

                self.accept()

            except SecurityException as se:
                QMessageBox.critical(self,
                                     QApplication.translate("newUserDlg", "Create New User Error"), str(se))
                self.user = None

            except sqlalchemy.exc.ProgrammingError as pe:
                QMessageBox.critical(self,
                                     QApplication.translate("newUserDlg", "Create New User Error"), str(pe))
                self.user = None
Exemplo n.º 3
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 def _getUserRoles(self):
     """
     Get roles that the user belongs to
     """
     roleProvider = RoleProvider()
     self.userRoles = roleProvider.GetRolesForUser(self.username)
     """
     If user name is postgres then add it to the list of user roles since
     it is not a group role in PostgreSQL but content is initialized by
     morphing it as a role in registering content items
     """
     pg_account = 'postgres'
     if self.username == pg_account:
         self.userRoles.append(pg_account)
Exemplo n.º 4
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    def loadRoles(self):
        """
        Loads the roles of the database cluster
        """
        self.roleProvider = RoleProvider()
        roles = self.roleProvider.GetAllRoles()
        roleNames = []
        # Remove the postgresql role if it exists
        for role in roles:
            if role.name != 'postgres':
                roleNames.append(role.name)
        self.rolesModel = UsersRolesModel(roleNames)
        self.sortRoles()
        self.lstRoles.setModel(self.rolesModel)

        # Load mapping roles view as well
        self.lstMappingRoles.setModel(self.rolesModel)
Exemplo n.º 5
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 def loadRoles(self):
     '''
     Loads the roles of the database cluster
     '''
     self.roleProvider = RoleProvider()
     roles = self.roleProvider.GetAllRoles()
     roleNames = []
     #Remove the postgresql role if it exists
     for role in roles:
         if role.name != 'postgres':
             roleNames.append(role.name)
     self.rolesModel = UsersRolesModel(roleNames)
     self.sortRoles()
     self.lstRoles.setModel(self.rolesModel)
     
     #Load mapping roles view as well
     self.lstMappingRoles.setModel(self.rolesModel)
Exemplo n.º 6
0
class contentAuthDlg(QDialog, Ui_frmContentAuth):
    '''
    Content authorization dialog
    '''
    def __init__(self, plugin):
        QDialog.__init__(self, plugin.iface.mainWindow())
        self.setupUi(self)

        #Initialize the dialog
        self.initGui()

        #Load users
        self.loadContent()

        #Load Roles
        self.loadRoles()

        #Reference to the currently selected STDM content item
        self.currentContent = None

    def initGui(self):
        '''
        Initialize GUI properties
        '''
        #Disable any action by the user in the roles view
        self.lstRoles.setEnabled(False)

        #Connect signals
        QObject.connect(self.lstContent,
                        SIGNAL("activated(const QModelIndex&)"),
                        self.onContentClicked)
        QObject.connect(self.lstContent, SIGNAL("clicked(const QModelIndex&)"),
                        self.onContentClicked)
        QObject.connect(self.lstRoles, SIGNAL("activated(const QModelIndex&)"),
                        self.onRoleSelected)
        QObject.connect(self.lstRoles, SIGNAL("clicked(const QModelIndex&)"),
                        self.onRoleSelected)

    def loadContent(self):
        '''
        Loads STDM content items
        '''
        self.content = Content()
        #self.content=Table('content_base',Base.metadata,autoload=True,autoload_with=STDMDb.instance().engine)
        cntItems = self.content.queryObject().all()
        '''
        self.content=Table('content_base',Base.metadata,autoload=True,autoload_with=STDMDb.instance().engine)
        
        session= STDMDb.instance().session
        cntItems=session.query(self.content)
        '''
        cnts = [cntItem.name for cntItem in cntItems]
        self.contentModel = UsersRolesModel(cnts)
        self.lstContent.setModel(self.contentModel)

    def loadRoles(self, contentname=""):
        '''
        Loads the roles in the database cluster
        '''
        self.roleProvider = RoleProvider()
        sysRoles = self.roleProvider.GetAllRoles()
        roles = []

        #Load the corresponding roles for the specified content item
        cnt = Content()
        if contentname != "":
            self.currentContent = self.content.queryObject().filter(
                Content.name == contentname).first()
            if self.currentContent:
                roles = [rl.name for rl in self.currentContent.roles]

        #Initialize model
        self.roleMappingsModel = QStandardItemModel(self)
        self.roleMappingsModel.setColumnCount(1)

        #Add role items into the standard item model
        for r in range(len(sysRoles)):
            role = sysRoles[r]
            if role.name != "postgres":
                roleItem = self._createNewRoleItem(role.name)

                #Check if the db role is in the approved for the current content item
                roleIndex = getIndex(roles, role.name)
                if roleIndex != -1:
                    roleItem.setCheckState(Qt.Checked)

                self.roleMappingsModel.appendRow(roleItem)

        self.lstRoles.setModel(self.roleMappingsModel)

    def _createNewRoleItem(self, rolename):
        '''
        Creates a custom role item for use in a QStandardItemModel
        '''
        #Set icon
        icon = QIcon()
        icon.addPixmap(QPixmap(":/plugins/stdm/images/icons/roles.png"),
                       QIcon.Normal, QIcon.Off)

        roleItem = QStandardItem(icon, rolename)
        roleItem.setCheckable(True)
        roleItem.setCheckState(Qt.Unchecked)

        return roleItem

    def onContentClicked(self, index):
        '''
        Slot activated when a content item is selected to load the roles for the specified content items
        '''
        self.lstRoles.setEnabled(True)
        contentName = index.data()
        self.loadRoles(contentName)
        self.privilege_provider = SinglePrivilegeProvider(
            contentName, current_profile())

    def onRoleSelected(self, index):
        '''
        Slot which is called when a user checks/unchecks to add/remove a role for the 
        specified content item.
        '''
        if self.currentContent != None:

            item = self.roleMappingsModel.itemFromIndex(index)
            rolename = item.text()

            self.privilege_provider.role = rolename

            #Get role object from role name
            role = Role()
            rl = role.queryObject().filter(Role.name == rolename).first()

            self.blockSignals(True)

            #Add role to the content item if the item is selected  or remove if it was previosuly checked
            if item.checkState() == Qt.Checked:
                self.currentContent.roles.append(rl)
                self.privilege_provider.grant_privilege()

            elif item.checkState() == Qt.Unchecked:
                self.currentContent.roles.remove(rl)
                self.privilege_provider.revoke_privilege()

            self.currentContent.update()

            self.blockSignals(False)
Exemplo n.º 7
0
class manageAccountsDlg(QDialog, Ui_frmSysManageAccounts):
    """
    User- and Role-management dialog class
    """
    def __init__(self, plugin):
        QDialog.__init__(self, plugin.iface.mainWindow())
        self.setupUi(self)

        # Initialize the dialog
        self.initGui()

        # Load users
        self.loadUsers()

        # Load Roles
        self.loadRoles()

        # Load user mappings
        self.loadUserMappings()

        # Reference to the currently selected STDM role for which user mappings need to be defined
        self.currentRole = None

    def initGui(self):
        """
        Set control properties
        """
        # Set properties for 'Users' button box
        btnUserNew = self.btnManageUsers.button(QDialogButtonBox.Ok)
        btnUserNew.setText(
            QApplication.translate("manageAccountsDlg", "New") + "...")
        QObject.connect(btnUserNew, SIGNAL("clicked()"), self.onNewUser)

        btnUserEdit = self.btnManageUsers.button(QDialogButtonBox.Save)
        btnUserEdit.setText(QApplication.translate("manageAccountsDlg",
                                                   "Edit"))
        QObject.connect(btnUserEdit, SIGNAL("clicked()"), self.onEditUser)

        btnUserDelete = self.btnManageUsers.button(QDialogButtonBox.Cancel)
        btnUserDelete.setText(
            QApplication.translate("manageAccountsDlg", "Delete"))
        QObject.connect(btnUserDelete, SIGNAL("clicked()"), self.onDeleteUser)

        # Set properties for 'Roles' button box
        btnRoleNew = self.btnManageRoles.button(QDialogButtonBox.Ok)
        btnRoleNew.setText(
            QApplication.translate("manageAccountsDlg", "New") + "...")
        QObject.connect(btnRoleNew, SIGNAL("clicked()"), self.onNewRole)

        btnRoleDelete = self.btnManageRoles.button(QDialogButtonBox.Cancel)
        btnRoleDelete.setText(
            QApplication.translate("manageAccountsDlg", "Delete"))
        QObject.connect(btnRoleDelete, SIGNAL("clicked()"), self.onDeleteRole)

        btnRoleSync = self.btnManageRoles.button(QDialogButtonBox.Apply)
        btnRoleSync.setText(QApplication.translate("manageAccountsDlg",
                                                   "Sync"))
        btnRoleSync.setToolTip(
            QApplication.translate(
                "manageAccountsDlg",
                "Synchronize STDM roles with database roles"))
        QObject.connect(btnRoleSync, SIGNAL("clicked()"), self.onSyncRoles)

        # Data view signals
        QObject.connect(self.lstRoles, SIGNAL("clicked(const QModelIndex&)"),
                        self.onRoleSelected)
        QObject.connect(self.lstRoles, SIGNAL("activated(const QModelIndex&)"),
                        self.onRoleSelected)
        QObject.connect(self.lstMappingRoles,
                        SIGNAL("activated(const QModelIndex&)"),
                        self.onRoleMappingSelected)
        QObject.connect(self.lstMappingRoles,
                        SIGNAL("clicked(const QModelIndex&)"),
                        self.onRoleMappingSelected)
        QObject.connect(self.lstMappingUsers,
                        SIGNAL("activated(const QModelIndex&)"),
                        self.onUserMappingSelected)
        QObject.connect(self.lstMappingUsers,
                        SIGNAL("clicked(const QModelIndex&)"),
                        self.onUserMappingSelected)

        # Disable any action by the user in the user roles mapping list view
        self.lstMappingUsers.setEnabled(False)

    def onNewUser(self):
        """
        Slot activated when the user requests to create a new user
        """
        frmNewUser = newUserDlg(self)
        result = frmNewUser.exec_()

        # Add new user to dependent models
        if result == QDialog.Accepted:
            user = frmNewUser.user

            # Add new user to Users view
            numUsers = self.usersModel.rowCount()
            self.usersModel.insertRows(numUsers, 1)
            index = self.usersModel.index(numUsers)
            self.usersModel.setData(index, user.UserName)

            # Add the user to the user mappings list
            userItem = self._createNewUserMapping(user.UserName)
            numUsers = self.UserMappingsModel.rowCount()
            self.UserMappingsModel.setItem(numUsers, userItem)

            # Sort users
            self.sortUsers()

    def loadUsers(self):
        """
        Loads the names of existing users
        """
        self.membership = Membership()
        users = self.membership.getAllUsers()
        self.usersModel = UsersRolesModel(users)
        self.sortUsers()
        self.lstUsers.setModel(self.usersModel)

    def loadRoles(self):
        """
        Loads the roles of the database cluster
        """
        self.roleProvider = RoleProvider()
        roles = self.roleProvider.GetAllRoles()
        roleNames = []
        # Remove the postgresql role if it exists
        for role in roles:
            if role.name != 'postgres':
                roleNames.append(role.name)
        self.rolesModel = UsersRolesModel(roleNames)
        self.sortRoles()
        self.lstRoles.setModel(self.rolesModel)

        # Load mapping roles view as well
        self.lstMappingRoles.setModel(self.rolesModel)

    def onEditUser(self):
        """
        Slot activated for editing a selected user
        """
        selItems = self.lstUsers.selectionModel().selectedRows()

        if len(selItems) == 0:
            msg = QApplication.translate("manageAccountsDlg",
                                         "Please select a user to edit.")
            QMessageBox.warning(
                self, QApplication.translate("manageAccountsDlg",
                                             "Select User"), msg)
            return

        # Get user from the first item in the selection
        username = selItems[0].data()
        user = self.membership.getUser(username)

        if user != None:
            frmUserUpdate = newUserDlg(self, user)
            frmUserUpdate.exec_()

    def onDeleteUser(self):
        """
        Slot activated for deleting a selected user
        """
        selItems = self.lstUsers.selectionModel().selectedRows()

        if len(selItems) == 0:
            msg = QApplication.translate("manageAccountsDlg",
                                         "Please select a user to delete.")
            QMessageBox.warning(
                self, QApplication.translate("manageAccountsDlg",
                                             "Select User"), msg)
            return

        # Get user from the first item in the selection
        userIndex = selItems[0]
        username = userIndex.data()

        msg = QApplication.translate(
            "manageAccountsDlg",
            "Are you sure you want to delete '%s'?\nOnce deleted, this user account cannot be recovered."
            % (username, ))
        result = QMessageBox.warning(
            self, QApplication.translate("manageAccountsDlg", "Delete User"),
            msg, QMessageBox.Yes | QMessageBox.No, QMessageBox.No)

        if result == QMessageBox.Yes:
            # Delete the user
            self.membership.deleteUser(username)

            # Remove user from the list
            self.usersModel.removeRows(userIndex.row(), 1)

            # Remove corresponding item from the user mapping list view
            self.UserMappingsModel.removeRow(userIndex.row())

            # Sort users
            self.sortUsers()

    def onSyncRoles(self):
        """
        Slot for synchronizing STDM roles with database cluster roles.
        This is very important especially on first time login by the superuser/'postgres' account
        """
        self.roleProvider.syncSTDMRoles()

        # Update view
        self.loadRoles()

        # Reset role description label
        self.lblRoleDescription.setText("")

    def sortUsers(self):
        """
        Sort users in ascending order
        """
        self.usersModel.sort(0, Qt.AscendingOrder)

    def sortRoles(self):
        """
        Sorts the roles in ascending order
        """
        self.rolesModel.sort(0, Qt.AscendingOrder)

    def onNewRole(self):
        """
        Slot for creating new role
        """
        frmNewRole = newRoleDlg(self)
        result = frmNewRole.exec_()

        if result == QDialog.Accepted:
            role = frmNewRole.role

            # Add new role to roles view
            numRoles = self.rolesModel.rowCount()
            self.rolesModel.insertRows(numRoles, 1)
            index = self.rolesModel.index(numRoles)
            self.rolesModel.setData(index, role.name)

            # Sort model contents
            self.sortRoles()

    def onRoleSelected(self, index):
        """
        Slot activated when a role item in the view is selected to load the description text.
        """
        roleName = index.data()
        role = self.roleProvider.GetRole(roleName)
        if role != None:
            self.lblRoleDescription.setText(role.description)

    def onDeleteRole(self):
        """
        Slot for deleting the selected role
        """
        selItems = self.lstRoles.selectionModel().selectedRows()

        if len(selItems) == 0:
            msg = QApplication.translate("manageAccountsDlg",
                                         "Please select a role to delete.")
            QMessageBox.warning(
                self, QApplication.translate("manageAccountsDlg",
                                             "Select Role"), msg)
            return

        # Get role from the first item in the selection
        roleIndex = selItems[0]
        rolename = roleIndex.data()

        msg = QApplication.translate(
            "manageAccountsDlg",
            "Are you sure you want to delete '%s'?\nOnce deleted, this role cannot be recovered."
            % (rolename, ))
        result = QMessageBox.warning(
            self, QApplication.translate("manageAccountsDlg", "Delete Role"),
            msg, QMessageBox.Yes | QMessageBox.No, QMessageBox.No)

        if result == QMessageBox.Yes:
            # Delete the role
            self.roleProvider.DeleteSTDMRole(rolename)
            self.roleProvider.DeleteRole(rolename)

            # Remove user from the list and role mappings view
            self.rolesModel.removeRows(roleIndex.row(), 1)

            self.lblRoleDescription.setText("")

            self.sortRoles()

    def loadUserMappings(self, rolename=""):
        """
        Loads checked/unchecked users in the user mappings list based on whether they are non/members
        of the specified group.
        If rolename is empty, then just load all users with the check state set to 'Unchecked'
        """
        roleUsers = []
        if rolename != "":
            roleUsers = self.roleProvider.GetUsersInRole(rolename)

        sysUsers = self.usersModel._users

        # Initialize model
        self.UserMappingsModel = QStandardItemModel(len(sysUsers), 1, self)

        # Create standard user items (checkable and with an icon) then add them to the list view
        for u in range(len(sysUsers)):
            user = sysUsers[u]
            userItem = self._createNewUserMapping(user)

            # If the user is in the given role then set checkstate to 'checked'
            sysIndex = getIndex(roleUsers, user)
            if sysIndex != -1:
                userItem.setCheckState(Qt.Checked)

            self.UserMappingsModel.setItem(u, userItem)

        self.lstMappingUsers.setModel(self.UserMappingsModel)

    def _createNewUserMapping(self, username):
        """
        Adds a new user to the list of user mappings
        """
        # Set icon
        icon = QIcon()
        icon.addPixmap(QPixmap(":/plugins/stdm/images/icons/user.png"),
                       QIcon.Normal, QIcon.Off)

        userItem = QStandardItem(icon, username)
        userItem.setCheckable(True)
        userItem.setCheckState(Qt.Unchecked)

        return userItem

    def onRoleMappingSelected(self, index):
        """
        Slot activated when a role item in the mapping view is selected to load the users
        in the specified role
        """
        self.lstMappingUsers.setEnabled(True)
        roleName = index.data()
        self.currentRole = roleName
        self.loadUserMappings(roleName)

    def onUserMappingSelected(self, index):
        """
        Slot which is called when a user item in the user mapping list has been clicked or selected to
        add it to the currently selected role
        """
        if self.currentRole is not None:

            item = self.UserMappingsModel.itemFromIndex(index)
            username = item.text()

            self.blockSignals(True)

            # Add user to role if the item is selected or remove if it was checked
            if item.checkState() == Qt.Checked:
                self.roleProvider.AddUsersToRoles([username],
                                                  [self.currentRole])
            elif item.checkState() == Qt.Unchecked:
                self.roleProvider.RemoveUsersFromRoles([username],
                                                       [self.currentRole])

            self.blockSignals(False)
Exemplo n.º 8
0
class manageAccountsDlg(QDialog, Ui_frmSysManageAccounts):
    '''
    User- and Role-management dialog class
    '''
    def __init__(self,plugin):
        QDialog.__init__(self,plugin.iface.mainWindow())
        self.setupUi(self)  
        
        #Initialize the dialog
        self.initGui()
        
        #Load users
        self.loadUsers()
        
        #Load Roles
        self.loadRoles()
        
        #Load user mappings
        self.loadUserMappings()
        
        #Reference to the currently selected STDM role for which user mappings need to be defined
        self.currentRole = None
        
    def initGui(self):
        '''
        Set control properties
        '''  
        #Set properties for 'Users' button box
        btnUserNew = self.btnManageUsers.button(QDialogButtonBox.Ok)  
        btnUserNew.setText(QApplication.translate("manageAccountsDlg", "New") + "...")
        QObject.connect(btnUserNew, SIGNAL("clicked()"),self.onNewUser)
        
        btnUserEdit = self.btnManageUsers.button(QDialogButtonBox.Save)  
        btnUserEdit.setText(QApplication.translate("manageAccountsDlg", "Edit"))
        QObject.connect(btnUserEdit, SIGNAL("clicked()"),self.onEditUser)
        
        btnUserDelete = self.btnManageUsers.button(QDialogButtonBox.Cancel)  
        btnUserDelete.setText(QApplication.translate("manageAccountsDlg", "Delete"))
        QObject.connect(btnUserDelete, SIGNAL("clicked()"),self.onDeleteUser)
        
        #Set properties for 'Roles' button box
        btnRoleNew = self.btnManageRoles.button(QDialogButtonBox.Ok)  
        btnRoleNew.setText(QApplication.translate("manageAccountsDlg", "New") + "...")
        QObject.connect(btnRoleNew, SIGNAL("clicked()"),self.onNewRole)        
        
        btnRoleDelete = self.btnManageRoles.button(QDialogButtonBox.Cancel)  
        btnRoleDelete.setText(QApplication.translate("manageAccountsDlg", "Delete"))
        QObject.connect(btnRoleDelete, SIGNAL("clicked()"),self.onDeleteRole)     
        
        btnRoleSync = self.btnManageRoles.button(QDialogButtonBox.Apply)  
        btnRoleSync.setText(QApplication.translate("manageAccountsDlg", "Sync"))
        btnRoleSync.setToolTip(QApplication.translate("manageAccountsDlg", "Synchronize STDM roles with database roles"))
        QObject.connect(btnRoleSync, SIGNAL("clicked()"),self.onSyncRoles)
        
        #Data view signals
        QObject.connect(self.lstRoles, SIGNAL("clicked(const QModelIndex&)"),self.onRoleSelected)
        QObject.connect(self.lstRoles, SIGNAL("activated(const QModelIndex&)"),self.onRoleSelected)
        QObject.connect(self.lstMappingRoles, SIGNAL("activated(const QModelIndex&)"),self.onRoleMappingSelected)        
        QObject.connect(self.lstMappingRoles, SIGNAL("clicked(const QModelIndex&)"),self.onRoleMappingSelected)
        QObject.connect(self.lstMappingUsers, SIGNAL("activated(const QModelIndex&)"),self.onUserMappingSelected)        
        QObject.connect(self.lstMappingUsers, SIGNAL("clicked(const QModelIndex&)"),self.onUserMappingSelected)
        
        #Disable any action by the user in the user roles mapping list view
        self.lstMappingUsers.setEnabled(False)
        
    def onNewUser(self):
        '''
        Slot activated when the user requests to create a new user
        '''
        frmNewUser = newUserDlg(self)
        result = frmNewUser.exec_()
        
        #Add new user to dependent models
        if result == QDialog.Accepted:
            user = frmNewUser.user
            
            #Add new user to Users view
            numUsers = self.usersModel.rowCount()
            self.usersModel.insertRows(numUsers, 1)
            index = self.usersModel.index(numUsers)
            self.usersModel.setData(index,user.UserName)
            
            #Add the user to the user mappings list
            userItem = self._createNewUserMapping(user.UserName)
            numUsers = self.UserMappingsModel.rowCount()
            self.UserMappingsModel.setItem(numUsers, userItem)
            
            #Sort users
            self.sortUsers()            
        
    def loadUsers(self):
        '''
        Loads the names of existing users
        '''
        self.membership = Membership()
        users = self.membership.getAllUsers()
        self.usersModel = UsersRolesModel(users)
        self.sortUsers()
        self.lstUsers.setModel(self.usersModel)
        
    def loadRoles(self):
        '''
        Loads the roles of the database cluster
        '''
        self.roleProvider = RoleProvider()
        roles = self.roleProvider.GetAllRoles()
        roleNames = []
        #Remove the postgresql role if it exists
        for role in roles:
            if role.name != 'postgres':
                roleNames.append(role.name)
        self.rolesModel = UsersRolesModel(roleNames)
        self.sortRoles()
        self.lstRoles.setModel(self.rolesModel)
        
        #Load mapping roles view as well
        self.lstMappingRoles.setModel(self.rolesModel)
        
    def onEditUser(self):
        '''
        Slot activated for editing a selected user
        '''
        selItems = self.lstUsers.selectionModel().selectedRows()
        
        if len(selItems) == 0:
            msg = QApplication.translate("manageAccountsDlg", "Please select a user to edit.")
            QMessageBox.warning(self, QApplication.translate("manageAccountsDlg", "Select User"),msg)
            return
        
        #Get user from the first item in the selection
        username = selItems[0].data()
        user = self.membership.getUser(username)

        if user != None:
            frmUserUpdate = newUserDlg(self,user)
            frmUserUpdate.exec_()
            
    def onDeleteUser(self):
        '''
        Slot activated for deleting a selected user
        '''
        selItems = self.lstUsers.selectionModel().selectedRows()
        
        if len(selItems) == 0:
            msg = QApplication.translate("manageAccountsDlg", "Please select a user to delete.")
            QMessageBox.warning(self, QApplication.translate("manageAccountsDlg", "Select User"),msg)
            return
        
        #Get user from the first item in the selection
        userIndex = selItems[0]
        username = userIndex.data()       
        
        msg = QApplication.translate("manageAccountsDlg", 
                                     "Are you sure you want to delete '%s'?\nOnce deleted, this user account cannot be recovered."%(username,))
        result = QMessageBox.warning(self, QApplication.translate("manageAccountsDlg","Delete User"), msg,
                                     QMessageBox.Yes|QMessageBox.No, QMessageBox.No)
        
        if result == QMessageBox.Yes:                        
            #Delete the user
            self.membership.deleteUser(username)
            
            #Remove user from the list
            self.usersModel.removeRows(userIndex.row(), 1)
            
            #Remove corresponding item from the user mapping list view
            self.UserMappingsModel.removeRow(userIndex.row())
            
            #Sort users
            self.sortUsers()
            
    def onSyncRoles(self):
        '''
        Slot for synchronizing STDM roles with database cluster roles.
        This is very important especially on first time login by the superuser/'postgres' account
        '''
        self.roleProvider.syncSTDMRoles()
        
        #Update view
        self.loadRoles()
        
        #Reset role description label
        self.lblRoleDescription.setText("")
        
    def sortUsers(self):
        '''
        Sort users in ascending order
        '''
        self.usersModel.sort(0,Qt.AscendingOrder)
        
    def sortRoles(self):
        '''
        Sorts the roles in ascending order
        '''        
        self.rolesModel.sort(0,Qt.AscendingOrder)
        
    def onNewRole(self):
        '''
        Slot for creating new role
        '''
        frmNewRole = newRoleDlg(self)
        result = frmNewRole.exec_()
        
        if result == QDialog.Accepted:
            role = frmNewRole.role
            
            #Add new role to roles view
            numRoles = self.rolesModel.rowCount()
            self.rolesModel.insertRows(numRoles, 1)
            index = self.rolesModel.index(numRoles)
            self.rolesModel.setData(index,role.name)
            
            #Sort model contents
            self.sortRoles()

    def onRoleSelected(self,index):
        '''
        Slot activated when a role item in the view is selected to load the description text.
        '''
        roleName = index.data()
        role = self.roleProvider.GetRole(roleName)
        if role != None:
            self.lblRoleDescription.setText(role.description)
            
    def onDeleteRole(self):
        '''
        Slot for deleting the selected role
        '''
        selItems = self.lstRoles.selectionModel().selectedRows()
        
        if len(selItems) == 0:
            msg = QApplication.translate("manageAccountsDlg", "Please select a role to delete.")
            QMessageBox.warning(self, QApplication.translate("manageAccountsDlg", "Select Role"),msg)
            return
        
        #Get role from the first item in the selection
        roleIndex = selItems[0]
        rolename = roleIndex.data()       
        
        msg = QApplication.translate("manageAccountsDlg", 
                                     "Are you sure you want to delete '%s'?\nOnce deleted, this role cannot be recovered."%(rolename,))
        result = QMessageBox.warning(self, QApplication.translate("manageAccountsDlg","Delete Role"), msg,
                                     QMessageBox.Yes|QMessageBox.No, QMessageBox.No)
        
        if result == QMessageBox.Yes:                        
            #Delete the role
            self.roleProvider.DeleteSTDMRole(rolename)
            self.roleProvider.DeleteRole(rolename)
            
            #Remove user from the list and role mappings view
            self.rolesModel.removeRows(roleIndex.row(), 1)            
            
            self.lblRoleDescription.setText("")
            
            self.sortRoles()
            
    def loadUserMappings(self,rolename = ""):
        '''
        Loads checked/unchecked users in the user mappings list based on whether they are non/members
        of the specified group.
        If rolename is empty, then just load all users with the check state set to 'Unchecked'
        '''
        roleUsers = []
        if rolename != "":            
            roleUsers = self.roleProvider.GetUsersInRole(rolename)           
            
        sysUsers = self.usersModel._users
        
        #Initialize model
        self.UserMappingsModel = QStandardItemModel(len(sysUsers),1,self)
        
        #Create standard user items (checkable and with an icon) then add them to the list view
        for u in range(len(sysUsers)):
            user = sysUsers[u]
            userItem = self._createNewUserMapping(user)
            
            #If the user is in the given role then set checkstate to 'checked'
            sysIndex = getIndex(roleUsers,user)
            if sysIndex != -1:
                userItem.setCheckState(Qt.Checked)
            
            self.UserMappingsModel.setItem(u, userItem)
            
        self.lstMappingUsers.setModel(self.UserMappingsModel)
        
    def _createNewUserMapping(self,username):
        '''
        Adds a new user to the list of user mappings
        '''
        #Set icon
        icon = QIcon()
        icon.addPixmap(QPixmap(":/plugins/stdm/images/icons/user.png"), QIcon.Normal, QIcon.Off)
        
        userItem = QStandardItem(icon,username)
        userItem.setCheckable(True)
        userItem.setCheckState(Qt.Unchecked)
        
        return userItem
        
    def onRoleMappingSelected(self,index):
        '''
        Slot activated when a role item in the mapping view is selected to load the users
        in the specified role
        '''
        self.lstMappingUsers.setEnabled(True)
        roleName = index.data()
        self.currentRole = roleName
        self.loadUserMappings(roleName)
        
    def onUserMappingSelected(self,index):
        '''
        Slot which is called when a user item in the user mapping list has been clicked or selected to 
        add it to the currently selected role
        '''
        if self.currentRole != None:                        
            
            item = self.UserMappingsModel.itemFromIndex(index)
            username = item.text()
            
            self.blockSignals(True)
            
            #Add user to role if the item is selected or remove if it was checked
            if item.checkState() == Qt.Checked:                 
                self.roleProvider.AddUsersToRoles([username], [self.currentRole])
            elif item.checkState() == Qt.Unchecked:
                self.roleProvider.RemoveUsersFromRoles([username], [self.currentRole])

            self.blockSignals(False)