## $Id: student.py 8737 2012-06-17 07:32:08Z 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 ## """ Container for the various objects owned by students. """ import os import re import shutil import grok from hurry.workflow.interfaces import IWorkflowState, IWorkflowInfo from zope.component import getUtility, createObject from zope.component.interfaces import IFactory from zope.interface import implementedBy from zope.securitypolicy.interfaces import IPrincipalRoleManager from waeup.kofa.image import KofaImageFile from waeup.kofa.imagestorage import DefaultFileStoreHandler from waeup.kofa.interfaces import ( IObjectHistory, IUserAccount, IFileStoreNameChooser, IFileStoreHandler, IKofaUtils, CLEARANCE, registration_states_vocab, IExtFileStore,) from waeup.kofa.students.accommodation import StudentAccommodation from waeup.kofa.students.export import EXPORTER_NAMES from waeup.kofa.students.interfaces import ( IStudent, IStudentNavigation, ICSVStudentExporter) from waeup.kofa.students.payments import StudentPaymentsContainer from waeup.kofa.students.utils import generate_student_id from waeup.kofa.utils.helpers import attrs_to_fields, now, copy_filesystem_tree RE_STUDID_NON_NUM = re.compile('[^\d]+') class Student(grok.Container): """This is a student container for the various objects owned by students. """ grok.implements(IStudent, IStudentNavigation) grok.provides(IStudent) def __init__(self): super(Student, self).__init__() # The site doesn't exist in unit tests try: self.student_id = generate_student_id() except TypeError: self.student_id = u'Z654321' self.password = None return def writeLogMessage(self, view, message): ob_class = view.__implemented__.__name__.replace('waeup.kofa.','') self.__parent__.logger.info( '%s - %s - %s' % (ob_class, self.__name__, message)) return @property def display_fullname(self): middlename = getattr(self, 'middlename', None) kofa_utils = getUtility(IKofaUtils) return kofa_utils.fullname(self.firstname, self.lastname, middlename) @property def fullname(self): middlename = getattr(self, 'middlename', None) if middlename: return '%s-%s-%s' % (self.firstname.lower(), middlename.lower(), self.lastname.lower()) else: return '%s-%s' % (self.firstname.lower(), self.lastname.lower()) @property def state(self): state = IWorkflowState(self).getState() return state @property def translated_state(self): state = registration_states_vocab.getTermByToken( self.state).title return state @property def history(self): history = IObjectHistory(self) return history @property def student(self): return self @property def certcode(self): cert = getattr(self.get('studycourse', None), 'certificate', None) if cert is not None: return cert.code return @property def faccode(self): cert = getattr(self.get('studycourse', None), 'certificate', None) if cert is not None: return cert.__parent__.__parent__.__parent__.code return @property def depcode(self): cert = getattr(self.get('studycourse', None), 'certificate', None) if cert is not None: return cert.__parent__.__parent__.code return @property def current_session(self): session = getattr( self.get('studycourse', None), 'current_session', None) return session @property def current_mode(self): certificate = getattr( self.get('studycourse', None), 'certificate', None) if certificate is not None: return certificate.study_mode return None @property def is_postgrad(self): is_postgrad = getattr( self.get('studycourse', None), 'is_postgrad', False) return is_postgrad # Set all attributes of Student required in IStudent as field # properties. Doing this, we do not have to set initial attributes # ourselves and as a bonus we get free validation when an attribute is # set. Student = attrs_to_fields(Student) class StudentFactory(grok.GlobalUtility): """A factory for students. """ grok.implements(IFactory) grok.name(u'waeup.Student') title = u"Create a new student.", description = u"This factory instantiates new student instances." def __call__(self, *args, **kw): return Student() def getInterfaces(self): return implementedBy(Student) @grok.subscribe(IStudent, grok.IObjectAddedEvent) def handle_student_added(student, event): """If a student is added all subcontainers are automatically added and the transition create is fired. The latter produces a logging message. """ if student.state == CLEARANCE: student.clearance_locked = False else: student.clearance_locked = True studycourse = createObject(u'waeup.StudentStudyCourse') student['studycourse'] = studycourse payments = StudentPaymentsContainer() student['payments'] = payments accommodation = StudentAccommodation() student['accommodation'] = accommodation # Assign global student role for new student account = IUserAccount(student) account.roles = ['waeup.Student'] # Assign local StudentRecordOwner role role_manager = IPrincipalRoleManager(student) role_manager.assignRoleToPrincipal( 'waeup.local.StudentRecordOwner', student.student_id) if student.state is None: IWorkflowInfo(student).fireTransition('create') return def path_from_studid(student_id): """Convert a student_id into a predictable relative folder path. Used for storing files. Returns the name of folder in which files for a particular student should be stored. This is a relative path, relative to any general students folder with 5 zero-padded digits (except when student_id is overlong). We normally map 1,000 different student ids into one single path. For instance ``K1000000`` will give ``01000/K1000000``, ``K1234567`` will give ``0123/K1234567`` and ``K12345678`` will result in ``1234/K12345678``. For lower numbers < 10**6 we return the same path for up to 10,000 student_ids. So for instance ``KM123456`` will result in ``00120/KM123456`` (there will be no path starting with ``00123``). Works also with overlong number: here the leading zeros will be missing but ``K123456789`` will give reliably ``12345/K123456789`` as expected. """ # remove all non numeric characters and turn this into an int. num = int(RE_STUDID_NON_NUM.sub('', student_id)) if num < 10**6: # store max. of 10000 studs per folder and correct num for 5 digits num = num / 10000 * 10 else: # store max. of 1000 studs per folder num = num / 1000 # format folder name to have 5 zero-padded digits folder_name = u'%05d' % num folder_name = os.path.join(folder_name, student_id) return folder_name def move_student_files(student, del_dir): """Move files belonging to `student` to `del_dir`. `del_dir` is expected to be the path to the site-wide directory for storing backup data. The current files of the student are removed after backup. If the student has no associated files stored, nothing is done. """ stud_id = student.student_id src = getUtility(IExtFileStore).root src = os.path.join(src, 'students', path_from_studid(stud_id)) dst = os.path.join( del_dir, 'media', 'students', path_from_studid(stud_id)) if not os.path.isdir(src): # Do not copy if no files were stored. return if not os.path.exists(dst): os.makedirs(dst, 0755) copy_filesystem_tree(src, dst) shutil.rmtree(src) return def update_student_deletion_csvs(student, del_dir): """Update deletion CSV files with data from student. `del_dir` is expected to be the path to the site-wide directory for storing backup data. Each exporter available for students (and their many subobjects) is called in order to export CSV data of the given student to csv files in the site-wide backup directory for object data (see DataCenter). Each exported row is appended a column giving the deletion date (column `del_date`) as a UTC timestamp. """ for name in EXPORTER_NAMES: exporter = getUtility(ICSVStudentExporter, name=name) csv_data = exporter.export_student(student) csv_data = csv_data.split('\r\n') # append a deletion timestamp on each data row timestamp = str(now().replace(microsecond=0)) # store UTC timestamp for num, row in enumerate(csv_data[1:-1]): csv_data[num+1] = csv_data[num+1] + ',' + timestamp csv_path = os.path.join(del_dir, '%s.csv' % name) # write data to CSV file if not os.path.exists(csv_path): # create new CSV file (including header line) csv_data[0] = csv_data[0] + ',del_date' open(csv_path, 'wb').write('\r\n'.join(csv_data)) else: # append existing CSV file (omitting headerline) open(csv_path, 'a').write('\r\n'.join(csv_data[1:])) return @grok.subscribe(IStudent, grok.IObjectRemovedEvent) def handle_student_removed(student, event): """If a student is removed a message is logged and data is put into a backup location. The data of the removed student is appended to CSV files in local datacenter and any existing external files (passport images, etc.) are copied over to this location as well. Documents in the file storage refering to the given student are removed afterwards (if they exist). Please make no assumptions about how the deletion takes place. Files might be deleted individually (leaving the students file directory intact) or the whole student directory might be deleted completely. All CSV rows created/appended contain a timestamp with the datetime of removal in an additional `del_date` column. XXX: blocking of used student_ids yet not implemented. """ comment = 'Student record removed' target = student.student_id try: site = grok.getSite() site['students'].logger.info('%s - %s' % ( target, comment)) except KeyError: # If we delete an entire university instance there won't be # a students subcontainer return del_dir = site['datacenter'].deleted_path # save files of the student move_student_files(student, del_dir) # update CSV files update_student_deletion_csvs(student, del_dir) return #: The file id marker for student files STUDENT_FILE_STORE_NAME = 'file-student' class StudentFileNameChooser(grok.Adapter): """A file id chooser for :class:`Student` objects. `context` is an :class:`Student` instance. The :class:`StudentImageNameChooser` can build/check file ids for :class:`Student` objects suitable for use with :class:`ExtFileStore` instances. The delivered file_id contains the file id marker for :class:`Student` object and the student id of the context student. This chooser is registered as an adapter providing :class:`waeup.kofa.interfaces.IFileStoreNameChooser`. File store name choosers like this one are only convenience components to ease the task of creating file ids for student objects. You are nevertheless encouraged to use them instead of manually setting up filenames for students. .. seealso:: :mod:`waeup.kofa.imagestorage` """ grok.context(IStudent) grok.implements(IFileStoreNameChooser) def checkName(self, name=None, attr=None): """Check whether the given name is a valid file id for the context. Returns ``True`` only if `name` equals the result of :meth:`chooseName`. """ return name == self.chooseName() def chooseName(self, attr, name=None): """Get a valid file id for student context. *Example:* For a student with student id ``'A123456'`` and with attr ``'nice_image.jpeg'`` stored in the students container this chooser would create: ``'__file-student__students/A/A123456/nice_image_A123456.jpeg'`` meaning that the nice image of this applicant would be stored in the site-wide file storage in path: ``students/A/A123456/nice_image_A123456.jpeg`` """ basename, ext = os.path.splitext(attr) stud_id = self.context.student_id marked_filename = '__%s__%s/%s_%s%s' % ( STUDENT_FILE_STORE_NAME, path_from_studid(stud_id), basename, stud_id, ext) return marked_filename class StudentFileStoreHandler(DefaultFileStoreHandler, grok.GlobalUtility): """Student specific file handling. This handler knows in which path in a filestore to store student files and how to turn this kind of data into some (browsable) file object. It is called from the global file storage, when it wants to get/store a file with a file id starting with ``__file-student__`` (the marker string for student files). Like each other file store handler it does not handle the files really (this is done by the global file store) but only computes paths and things like this. """ grok.implements(IFileStoreHandler) grok.name(STUDENT_FILE_STORE_NAME) def pathFromFileID(self, store, root, file_id): """All student files are put in directory ``students``. """ marker, filename, basename, ext = store.extractMarker(file_id) sub_root = os.path.join(root, 'students') return super(StudentFileStoreHandler, self).pathFromFileID( store, sub_root, basename) def createFile(self, store, root, filename, file_id, file): """Create a browsable file-like object. """ # call super method to ensure that any old files with # different filename extension are deleted. file, path, file_obj = super( StudentFileStoreHandler, self).createFile( store, root, filename, file_id, file) return file, path, KofaImageFile( file_obj.filename, file_obj.data)