source: main/waeup.kofa/trunk/src/waeup/kofa/students/webservices.py @ 10477

## $Id: webservices.py 10477 2013-08-10 01:10:04Z uli $
##
## Copyright (C) 2012 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
import xmlrpclib
from zope.component import getUtility, queryUtility
from zope.catalog.interfaces import ICatalog
from waeup.kofa.interfaces import IUniversity, IExtFileStore
    

def get_student(students, identifier):
    if identifier is None:
        return None
    student = students.get(identifier, None)
    if student is None:
        cat = queryUtility(ICatalog, name='students_catalog')
        results = list(
            cat.searchResults(matric_number=(identifier, identifier)))
        if len(results) == 1:
            student = results[0]
        else:
            results = list(
                cat.searchResults(reg_number=(identifier, identifier)))
            if len(results) == 1:
                student = results[0]
    return student

#class XMLRPCPermission(grok.Permission):
#    """Permission for using XMLRPC functions.
#    """
#    grok.name('waeup.xmlrpc')

#class XMLRPCUsers2(grok.Role):
#    """Usergroup 2
#    """
#    grok.name('waeup.xmlrpcusers2')
#    grok.title('XMLRPC Users Group 2')
#    grok.permissions('waeup.xmlrpc',)

class StudentsXMLRPC(grok.XMLRPC):
    """Student related XMLRPC webservices.

    Please note, that XMLRPC does not support real keyword arguments
    but positional arguments only.
    """

    grok.context(IUniversity)

    @grok.require('waeup.xmlrpc')
    def get_student_id(self, reg_number=None):
        """Get the id of a student with registration number `reg_number`.

        Returns the student id as string if successful, ``None`` else.
        """
        if reg_number is not None:
            cat = getUtility(ICatalog, name='students_catalog')
            result = list(
                cat.searchResults(reg_number=(reg_number, reg_number),
                                  _limit=1))
            if not len(result):
                return None
            return result[0].student_id
        return None

    @grok.require('waeup.xmlrpc')
    def get_courses_by_session(self, identifier=None, session=None):
        """1. What COURSES are registered by student X in session Y?

        """
        students = self.context['students']
        student = get_student(students, identifier)
        if student is None:
            return None
        try:
            session = int(session)
        except (TypeError, ValueError):
            pass
        sessionsearch = True
        if session in (None, ''):
            sessionsearch = False
        studycourse = student['studycourse']
        coursetickets = {}
        for level in studycourse.values():
            if sessionsearch and level.level_session != session:
                continue
            for ct in level.values():
                coursetickets.update(
                    {"%s|%s" % (level.level, ct.code): ct.title})
        if not coursetickets:
            return None
        return coursetickets

    @grok.require('waeup.xmlrpc')
    def get_students_by_course(self, course=None, session=None):
        """2. What STUDENTS registered (student id / matric no)
        for course Z in session Y and did they pay school fee?

        """
        try:
            session = int(session)
        except (TypeError, ValueError):
            pass
        sessionsearch = True
        if session in (None, ''):
            sessionsearch = False
        cat = queryUtility(ICatalog, name='coursetickets_catalog')
        if sessionsearch:
            coursetickets = cat.searchResults(
                session=(session, session),
                code=(course, course))
        else:
            coursetickets = cat.searchResults(
                code=(course, course))
        if not coursetickets:
            return None
        hitlist = []
        for c_ticket in coursetickets:
            amount = 0
            for p_ticket in c_ticket.student['payments'].values():
                if p_ticket.p_state == 'paid' and \
                    p_ticket.p_category == 'schoolfee' and \
                    p_ticket.p_session == c_ticket.__parent__.level_session:
                    amount = p_ticket.amount_auth
            hitlist.append((
                c_ticket.student.student_id,
                c_ticket.student.matric_number,
                c_ticket.__parent__.validated_by,
                amount
                ))
        return list(set(hitlist))

    @grok.require('waeup.xmlrpc')
    def get_student_info(self, identifier=None):
        """3a. Who is the student with matriculation number / student id

        """
        students = self.context['students']
        student = get_student(students, identifier)
        if student is None:
            return None
        return [student.display_fullname, student.certcode,
            student.phone, student.email]

    @grok.require('waeup.xmlrpc')
    def get_student_passport(self, identifier=None):
        """3b. Get passport picture of student with
        matriculation number / student id.

        """
        students = self.context['students']
        student = get_student(students, identifier)
        if student is None:
            return None
        img = getUtility(IExtFileStore).getFileByContext(
            student, attr='passport.jpg')
        return xmlrpclib.Binary(img.read())

    @grok.require('waeup.xmlrpc')
    def get_paid_sessions(self, identifier=None):
        """6. Get list of SESSIONS school fees paid by student X.

        """
        students = self.context['students']
        student = get_student(students, identifier)
        if student is None:
            return None
        payments_dict = {}
        for ticket in student['payments'].values():
            if ticket.p_state == 'paid' and \
                ticket.p_category == 'schoolfee':
                payments_dict[str(ticket.p_session)] = ticket.amount_auth
        if not payments_dict:
            return None
        return payments_dict

    @grok.require('waeup.xmlrpc')
    def check_credentials(self, key, username, password):
        """Returns student data if username and password are valid,
        None else.

        We only query the students authenticator plugin in order not
        to mix up with other credentials (admins, staff, etc.).

        All additional checks performed by usual student
        authentication apply. For instance for suspended students we
        won't get a successful response but `None`.

        This method can be used by CAS to authentify students for
        external systems like moodle.
        """
        from zope.pluggableauth.interfaces import IAuthenticatorPlugin
        auth = getUtility(IAuthenticatorPlugin, name='students')
        creds = dict(login=username, password=password)
        principal = auth.authenticateCredentials(creds)
        if principal is None:
            return None
        return dict(email=principal.email, id=principal.id,
                    type=principal.user_type,
                    description=principal.description)