## $Id: permissions.py 12835 2015-03-31 14:50:49Z henrik $
##
## Copyright (C) 2011 Uli Fouquet & Henrik Bettermann
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
##
import grok
from zope.component import getUtilitiesFor
from zope.interface import Interface
from zope.securitypolicy.interfaces import IRole, IPrincipalRoleMap
from waeup.kofa.interfaces import ILocalRolesAssignable

class Public(grok.Permission):
    """The everyone-can-do-this-permission is being applied to views/pages
    that are used by everyone.
    """
    grok.name('waeup.Public')

class Anonymous(grok.Permission):
    """The waeup.Anonymous permission is applied to
    views/pages which are dedicated to anonymous users only. Logged-in users
    can't access these views.
    """
    grok.name('waeup.Anonymous')

class Authenticated(grok.Permission):
    """The waeup.Authenticated permission is applied to pages
    which can only be used by logged-in users and not by anonymous users.
    """
    grok.name('waeup.Authenticated')

class ViewAcademics(grok.Permission):
    """The waeup.viewAcademics permission is applied to all
    views of the Academic Section. Users with this permission can view but
    not edit content in the Academic Section.
    """
    grok.name('waeup.viewAcademics')

class ManageAcademics(grok.Permission):
    """The waeup.manageAcademics permission is applied to all edit
    pages in the Academic Section. Users who have this permission
    can change/edit context objects.
    """
    grok.name('waeup.manageAcademics')

class ManagePortal(grok.Permission):
    """The waeup.managePortal permission is used for very few pages
    (e.g. the DatacenterSettings page) and is dedicated to portal managers.
    It is furthermore used to control delete methods of container
    pages in the Academic Section. The waeup.manageAcademics permission,
    described above, does enable users to edit content but not to
    remove sub-containers, like faculties, departments or certificates.
    Users must have the waeup.managePorta permission too to remove
    entire containers.
    """
    grok.name('waeup.managePortal')

class ManageUsers(grok.Permission):
    """The waeup.manageUsers permission is a real superuser permission
    and therefore very 'dangerous'. It allows to add, remove or edit
    user accounts. Editing a user account includes the option to assign
    or remove roles. That means that a user with this permission can lock out
    other users by either removing their account or by removing all
    permsissions. Only the system administrator will be able to revert this.
    """
    grok.name('waeup.manageUsers')

class ShowStudents(grok.Permission):
    """Users with this permission can see the 'Students' tab and
    search and browse all students. If they also have the waeup.exportData
    permission they can export all student data too.

    Bursary or Department Officers don't have the general waeup.exportData
    permission (see Roles section) and are only allowed to export bursary
    or payments overview data respectively.
    """
    grok.name('waeup.showStudents')

class ClearAllStudents(grok.Permission):
    """The waeup.clearAllStudents permission allows to clear all students
    in a department.
    """
    grok.name('waeup.clearAllStudents')

class EditScores(grok.Permission):
    """The waeup.editScores permission allows to edit scores in course tickets.
    """
    grok.name('waeup.editScores')

class EditUser(grok.Permission):
    """The waeup.editUser permission is required for editing
    single user accounts.
    """
    grok.name('waeup.editUser')

class ManageDataCenter(grok.Permission):
    """The waeup.manageDataCenter permission allows to access all pages
    in the data center. It does not automatically allow to process data.
    """
    grok.name('waeup.manageDataCenter')

class ImportData(grok.Permission):
    """The waeup.importData permission allows to import any kind of portal
    data.
    """
    grok.name('waeup.importData')

class ExportData(grok.Permission):
    """The waeup.exportData permission allows to export any kind of portal
    data.
    """
    grok.name('waeup.exportData')

class ExportPaymentsOverview(grok.Permission):
    grok.name('waeup.exportPaymentsOverview')

class ExportBursaryData(grok.Permission):
    grok.name('waeup.exportBursaryData')

class ViewTranscript(grok.Permission):
    grok.name('waeup.viewTranscript')

class ManagePortalConfiguration(grok.Permission):
    """The waeup.managePortalConfiguration permission allows to
    edit global and sessional portal configuration data.
    """
    grok.name('waeup.managePortalConfiguration')

class ManageACBatches(grok.Permission):
    """The waeup.manageACBatches permission allows to view and
    manage accesscodes.
    """
    grok.name('waeup.manageACBatches')

class PutBiometricDataPermission(grok.Permission):
    """This permission allows to upload/change biometric data.
    """
    grok.name('waeup.putBiometricData')

class GetBiometricDataPermission(grok.Permission):
    """This permission allows to read biometric data.
    """
    grok.name('waeup.getBiometricData')


# Local Roles
class ApplicationsManager(grok.Role):
    grok.name('waeup.local.ApplicationsManager')
    grok.title(u'Applications Manager')
    grok.permissions('waeup.viewAcademics')

class DepartmentManager(grok.Role):
    grok.name('waeup.local.DepartmentManager')
    grok.title(u'Department Manager')
    grok.permissions('waeup.manageAcademics',
                     'waeup.showStudents',
                     'waeup.exportData')

class DepartmentOfficer(grok.Role):
    grok.name('waeup.local.DepartmentOfficer')
    grok.title(u'Department Officer')
    grok.permissions('waeup.showStudents',
                     'waeup.viewAcademics',
                     'waeup.exportPaymentsOverview')

class ClearanceOfficer(grok.Role):
    """The clearance officer role is meant for the
    assignment of dynamic roles only.
    """
    grok.name('waeup.local.ClearanceOfficer')
    grok.title(u'Clearance Officer')
    grok.permissions('waeup.showStudents',
                     'waeup.viewAcademics',
                     'waeup.exportData',
                     'waeup.clearAllStudents')

class LocalStudentsManager(grok.Role):
    """The local students manager role is meant for the
    assignment of dynamic roles only.
    """
    grok.name('waeup.local.LocalStudentsManager')
    grok.title(u'Students Manager')
    grok.permissions('waeup.showStudents',
                     'waeup.viewAcademics',
                     'waeup.exportData')

class LocalWorkflowManager(grok.Role):
    """The local workflow manager role is meant for the
    assignment of dynamic roles only.
    """
    grok.name('waeup.local.LocalWorkflowManager')
    grok.title(u'Student Workflow Manager')
    grok.permissions('waeup.showStudents',
                     'waeup.viewAcademics',
                     'waeup.exportData')

class UGClearanceOfficer(grok.Role):
    """The clearance officer role is meant for the
    assignment of dynamic roles only.
    """
    grok.name('waeup.local.UGClearanceOfficer')
    grok.title(u'UG Clearance Officer')
    grok.permissions('waeup.showStudents',
                     'waeup.viewAcademics',
                     'waeup.exportData',
                     'waeup.clearAllStudents')

class PGClearanceOfficer(grok.Role):
    """The clearance officer role is meant for the
    assignment of dynamic roles only.
    """
    grok.name('waeup.local.PGClearanceOfficer')
    grok.title(u'PG Clearance Officer')
    grok.permissions('waeup.showStudents',
                     'waeup.viewAcademics',
                     'waeup.exportData',
                     'waeup.clearAllStudents')

class CourseAdviser100(grok.Role):
    """The 100 level course adviser role is meant for the
    assignment of dynamic roles only.
    """
    grok.name('waeup.local.CourseAdviser100')
    grok.title(u'Course Adviser 100L')
    grok.permissions('waeup.showStudents',
                     'waeup.viewAcademics',
                     'waeup.exportData')

class CourseAdviser200(grok.Role):
    """The course 200 level adviser role is meant for the
    assignment of dynamic roles only.
    """
    grok.name('waeup.local.CourseAdviser200')
    grok.title(u'Course Adviser 200L')
    grok.permissions('waeup.showStudents',
                     'waeup.viewAcademics',
                     'waeup.exportData')

class CourseAdviser300(grok.Role):
    """The 300 level course adviser role is meant for the
    assignment of dynamic roles only.
    """
    grok.name('waeup.local.CourseAdviser300')
    grok.title(u'Course Adviser 300L')
    grok.permissions('waeup.showStudents',
                     'waeup.viewAcademics',
                     'waeup.exportData')

class CourseAdviser400(grok.Role):
    """The 400 level course adviser role is meant for the
    assignment of dynamic roles only.
    """
    grok.name('waeup.local.CourseAdviser400')
    grok.title(u'Course Adviser 400L')
    grok.permissions('waeup.showStudents',
                     'waeup.viewAcademics',
                     'waeup.exportData')

class CourseAdviser500(grok.Role):
    """The 500 level course adviser role is meant for the
    assignment of dynamic roles only.
    """
    grok.name('waeup.local.CourseAdviser500')
    grok.title(u'Course Adviser 500L')
    grok.permissions('waeup.showStudents',
                     'waeup.viewAcademics',
                     'waeup.exportData')

class CourseAdviser600(grok.Role):
    """The 600 level course adviser role is meant for the
    assignment of dynamic roles only.
    """
    grok.name('waeup.local.CourseAdviser600')
    grok.title(u'Course Adviser 600L')
    grok.permissions('waeup.showStudents',
                     'waeup.viewAcademics',
                     'waeup.exportData')

class CourseAdviser700(grok.Role):
    """The 700 level course adviser role is meant for the
    assignment of dynamic roles only.
    """
    grok.name('waeup.local.CourseAdviser700')
    grok.title(u'Course Adviser 700L')
    grok.permissions('waeup.showStudents',
                     'waeup.viewAcademics',
                     'waeup.exportData')

class CourseAdviser800(grok.Role):
    """The 800 level course adviser role is meant for the
    assignment of dynamic roles only.
    """
    grok.name('waeup.local.CourseAdviser800')
    grok.title(u'Course Adviser 800L')
    grok.permissions('waeup.showStudents',
                     'waeup.viewAcademics',
                     'waeup.exportData')

class Lecturer(grok.Role):
    """The lecturer role is meant for the
    assignment of dynamic roles only.
    """
    grok.name('waeup.local.Lecturer')
    grok.title(u'Lecturer')
    grok.permissions('waeup.showStudents',
                     'waeup.editScores',
                     'waeup.viewAcademics',
                     'waeup.exportData')

class Owner(grok.Role):
    grok.name('waeup.local.Owner')
    grok.title(u'Owner')
    grok.permissions('waeup.editUser')

# Site Roles
class AcademicsOfficer(grok.Role):
    grok.name('waeup.AcademicsOfficer')
    grok.title(u'Academics Officer (view only)')
    grok.permissions('waeup.viewAcademics')

class AcademicsManager(grok.Role):
    grok.name('waeup.AcademicsManager')
    grok.title(u'Academics Manager')
    title = u'Academics Manager'
    grok.permissions('waeup.viewAcademics',
                     'waeup.manageAcademics')

class ACManager(grok.Role):
    grok.name('waeup.ACManager')
    grok.title(u'Access Code Manager')
    grok.permissions('waeup.manageACBatches')

class DataCenterManager(grok.Role):
    grok.name('waeup.DataCenterManager')
    grok.title(u'Datacenter Manager')
    grok.permissions('waeup.manageDataCenter')

class ImportManager(grok.Role):
    grok.name('waeup.ImportManager')
    grok.title(u'Import Manager')
    grok.permissions('waeup.manageDataCenter',
                     'waeup.importData')

class ExportManager(grok.Role):
    grok.name('waeup.ExportManager')
    grok.title(u'Export Manager')
    grok.permissions('waeup.manageDataCenter',
                     'waeup.exportData')

class BursaryOfficer(grok.Role):
    grok.name('waeup.BursaryOfficer')
    grok.title(u'Bursary Officer')
    grok.permissions('waeup.showStudents',
                     'waeup.viewAcademics',
                     'waeup.exportBursaryData')

class UsersManager(grok.Role):
    grok.name('waeup.UsersManager')
    grok.title(u'Users Manager')
    grok.permissions('waeup.manageUsers',
                     'waeup.editUser')

class WorkflowManager(grok.Role):
    grok.name('waeup.WorkflowManager')
    grok.title(u'Workflow Manager')
    grok.permissions('waeup.triggerTransition')

class PortalManager(grok.Role):
    """The portal manager role is the maximum set of Kofa permissions
    which are needed to manage the entire portal. This set must not
    be changed or customized. It is recommended to assign this role only
    to only a few portal administrators. A less dangerous manager role is the
    CCOfficer role described below. For the most tasks the CCOfficer role
    is sufficient.
    """
    grok.name('waeup.PortalManager')
    grok.title(u'Portal Manager')
    grok.permissions('waeup.managePortal',
                     'waeup.manageUsers',
                     'waeup.viewAcademics', 'waeup.manageAcademics',
                     'waeup.manageACBatches',
                     'waeup.manageDataCenter',
                     'waeup.importData',
                     'waeup.exportData',
                     'waeup.viewTranscript',
                     'waeup.viewDocuments', 'waeup.manageDocuments',
                     'waeup.managePortalConfiguration', 'waeup.viewApplication',
                     'waeup.manageApplication', 'waeup.handleApplication',
                     'waeup.viewApplicantsTab', 'waeup.payApplicant',
                     'waeup.viewApplicationStatistics',
                     'waeup.viewStudent', 'waeup.manageStudent',
                     'waeup.clearStudent', 'waeup.payStudent',
                     'waeup.uploadStudentFile', 'waeup.showStudents',
                     'waeup.clearAllStudents',
                     'waeup.editScores',
                     'waeup.triggerTransition',
                     'waeup.viewStudentsContainer','waeup.viewStudentsTab',
                     'waeup.handleAccommodation',
                     'waeup.viewHostels', 'waeup.manageHostels',
                     'waeup.editUser',
                     'waeup.loginAsStudent',
                     'waeup.manageReports',
                     'waeup.manageJobs',
                     )

class CCOfficer(grok.Role):
    """The Computer Center Officer role is basically a copy
    of the the PortalManager role. Some 'dangerous' permissions are excluded
    by commenting them out (see source code). If officers need to gain more
    access rights than defined in this role, do not hastily switch to the
    PortalManager role but add further manager roles instead. These additional
    roles could be: UsersManager, ACManager, ImportManager, WorkflowManager
    or StudentImpersonator.
    """
    grok.baseclass()
    grok.name('waeup.CCOfficer')
    grok.title(u'Computer Center Officer')
    grok.permissions(#'waeup.managePortal',
                     #'waeup.manageUsers',
                     'waeup.viewAcademics', 'waeup.manageAcademics',
                     #'waeup.manageACBatches',
                     'waeup.manageDataCenter',
                     #'waeup.importData',
                     'waeup.exportData',
                     'waeup.viewTranscript',
                     'waeup.viewDocuments', 'waeup.manageDocuments',
                     'waeup.managePortalConfiguration', 'waeup.viewApplication',
                     'waeup.manageApplication', 'waeup.handleApplication',
                     'waeup.viewApplicantsTab', 'waeup.payApplicant',
                     'waeup.viewApplicationStatistics',
                     'waeup.viewStudent', 'waeup.manageStudent',
                     'waeup.clearStudent', 'waeup.payStudent',
                     'waeup.uploadStudentFile', 'waeup.showStudents',
                     'waeup.clearAllStudents',
                     'waeup.editScores',
                     #'waeup.triggerTransition',
                     'waeup.viewStudentsContainer','waeup.viewStudentsTab',
                     'waeup.handleAccommodation',
                     'waeup.viewHostels', 'waeup.manageHostels',
                     #'waeup.editUser',
                     #'waeup.loginAsStudent',
                     'waeup.manageReports',
                     #'waeup.manageJobs',
                     )

def get_all_roles():
    """Return a list of tuples ``<ROLE-NAME>, <ROLE>``.
    """
    return getUtilitiesFor(IRole)

def get_waeup_roles(also_local=False):
    """Get all Kofa roles.

    Kofa roles are ordinary roles whose id by convention starts with
    a ``waeup.`` prefix.

    If `also_local` is ``True`` (``False`` by default), also local
    roles are returned. Local Kofa roles are such whose id starts
    with ``waeup.local.`` prefix (this is also a convention).

    Returns a generator of the found roles.
    """
    for name, item in get_all_roles():
        if not name.startswith('waeup.'):
            # Ignore non-Kofa roles...
            continue
        if not also_local and name.startswith('waeup.local.'):
            # Ignore local roles...
            continue
        yield item

def get_waeup_role_names():
    """Get the ids of all Kofa roles.

    See :func:`get_waeup_roles` for what a 'KofaRole' is.

    This function returns a sorted list of Kofa role names.
    """
    return sorted([x.id for x in get_waeup_roles()])

class LocalRolesAssignable(grok.Adapter):
    """Default implementation for `ILocalRolesAssignable`.

    This adapter returns a list for dictionaries for objects for which
    we want to know the roles assignable to them locally.

    The returned dicts contain a ``name`` and a ``title`` entry which
    give a role (``name``) and a description, for which kind of users
    the permission is meant to be used (``title``).

    Having this adapter registered we make sure, that for each normal
    object we get a valid `ILocalRolesAssignable` adapter.

    Objects that want to offer certain local roles, can do so by
    setting a (preferably class-) attribute to a list of role ids.

    You can also define different adapters for different contexts to
    have different role lookup mechanisms become available. But in
    normal cases it should be sufficient to use this basic adapter.
    """
    grok.context(Interface)
    grok.provides(ILocalRolesAssignable)

    _roles = []

    def __init__(self, context):
        self.context = context
        role_ids = getattr(context, 'local_roles', self._roles)
        self._roles = [(name, role) for name, role in get_all_roles()
                       if name in role_ids]
        return

    def __call__(self):
        """Get a list of dictionaries containing ``names`` (the roles to
        assign) and ``titles`` (some description of the type of user
        to assign each role to).
        """
        list_of_dict = [dict(
                name=name,
                title=role.title,
                description=role.description)
                for name, role in self._roles]
        return sorted(list_of_dict, key=lambda x: x['name'])

def get_all_users():
    """Get a list of dictionaries.
    """
    users = sorted(grok.getSite()['users'].items(), key=lambda x: x[1].title)
    for key, val in users:
        yield(dict(name=key, val=val))

def get_users_with_local_roles(context):
    """Get a list of dicts representing the local roles set for `context`.

    Each dict returns `user_name`, `user_title`, `local_role`,
    `local_role_title`, and `setting` for each entry in the local
    roles map of the `context` object.
    """
    try:
        role_map = IPrincipalRoleMap(context)
    except TypeError:
        # no map no roles.
        raise StopIteration
    for local_role, user_name, setting in role_map.getPrincipalsAndRoles():
        user = grok.getSite()['users'].get(user_name,None)
        user_title = getattr(user, 'title', user_name)
        local_role_title = getattr(
            dict(get_all_roles()).get(local_role, None), 'title', None)
        yield dict(user_name = user_name,
                   user_title = user_title,
                   local_role = local_role,
                   local_role_title = local_role_title,
                   setting = setting)

def get_users_with_role(role, context):
    """Get a list of dicts representing the usres who have been granted
    a role for `context`.
    """
    try:
        role_map = IPrincipalRoleMap(context)
    except TypeError:
        # no map no roles.
        raise StopIteration
    for user_name, setting in role_map.getPrincipalsForRole(role):
        user = grok.getSite()['users'].get(user_name,None)
        user_title = getattr(user, 'title', user_name)
        user_email = getattr(user, 'email', None)
        yield dict(user_name = user_name,
                   user_title = user_title,
                   user_email = user_email,
                   setting = setting)