import random import string import os import stat from os.path import dirname, pardir, abspath, join, exists import datetime import collections from django.http import HttpResponse from django.contrib.auth import login, logout, authenticate from django.shortcuts import render_to_response, get_object_or_404, redirect from django.template import RequestContext from django.http import Http404 from django.db.models import Sum from django.views.decorators.csrf import csrf_exempt from taggit.models import Tag from itertools import chain # Local imports. from testapp.exam.models import Quiz, Question, QuestionPaper, QuestionSet from testapp.exam.models import Profile, Answer, AnswerPaper, User, TestCase from testapp.exam.forms import UserRegisterForm, UserLoginForm, QuizForm,\ QuestionForm, RandomQuestionForm from testapp.exam.xmlrpc_clients import code_server from settings import URL_ROOT from testapp.exam.models import AssignmentUpload # The directory where user data can be saved. OUTPUT_DIR = abspath(join(dirname(__file__), 'output')) def my_redirect(url): """An overridden redirect to deal with URL_ROOT-ing. See settings.py for details.""" return redirect(URL_ROOT + url) def my_render_to_response(template, context=None, **kwargs): """Overridden render_to_response. """ if context is None: context = {'URL_ROOT': URL_ROOT} else: context['URL_ROOT'] = URL_ROOT return render_to_response(template, context, **kwargs) def gen_key(no_of_chars): """Generate a random key of the number of characters.""" allowed_chars = string.digits+string.uppercase return ''.join([random.choice(allowed_chars) for i in range(no_of_chars)]) def get_user_dir(user): """Return the output directory for the user.""" user_dir = join(OUTPUT_DIR, str(user.username)) if not exists(user_dir): os.mkdir(user_dir) # Make it rwx by others. os.chmod(user_dir, stat.S_IROTH | stat.S_IWOTH | stat.S_IXOTH | stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR | stat.S_IRGRP | stat.S_IWGRP | stat.S_IXGRP) return user_dir def is_moderator(user): """Check if the user is having moderator rights""" if user.groups.filter(name='moderator').count() == 1: return True def fetch_questions(request): """Fetch questions from database based on the given search conditions & tags""" set1 = set() set2 = set() first_tag = request.POST.get('first_tag') first_condition = request.POST.get('first_condition') second_tag = request.POST.get('second_tag') second_condition = request.POST.get('second_condition') third_tag = request.POST.get('third_tag') question1 = set(Question.objects.filter(tags__name__in=[first_tag])) question2 = set(Question.objects.filter(tags__name__in=[second_tag])) question3 = set(Question.objects.filter(tags__name__in=[third_tag])) if first_condition == 'and': set1 = question1.intersection(question2) if second_condition == 'and': set2 = set1.intersection(question3) else: set2 = set1.union(question3) else: set1 = question1.union(question2) if second_condition == 'and': set2 = set1.intersection(question3) else: set2 = set1.union(question3) return set2 def index(request): """The start page. """ user = request.user if user.is_authenticated(): if user.groups.filter(name='moderator').count() > 0: return my_redirect('/exam/manage/') return my_redirect("/exam/start/") return my_redirect("/exam/login/") def user_register(request): """ Register a new user. Create a user and corresponding profile and store roll_number also.""" user = request.user ci = RequestContext(request) if user.is_authenticated(): return my_redirect("/exam/start/") if request.method == "POST": form = UserRegisterForm(request.POST) if form.is_valid(): data = form.cleaned_data u_name, pwd = form.save() new_user = authenticate(username=u_name, password=pwd) login(request, new_user) return my_redirect("/exam/start/") else: return my_render_to_response('exam/register.html', {'form': form}, context_instance=ci) else: form = UserRegisterForm() return my_render_to_response('exam/register.html', {'form': form}, context_instance=ci) def quizlist_user(request): """Show All Quizzes that is available to logged-in user.""" user = request.user avail_quizzes = list(QuestionPaper.objects.filter(quiz__active=True)) user_answerpapers = AnswerPaper.objects.filter(user=user) quizzes_taken = user_answerpapers pre_requisites = [] context = {} if 'cannot_attempt' in request.GET: context['cannot_attempt'] = True if user_answerpapers.count() == 0: context['quizzes'] = avail_quizzes context['user'] = user context['quizzes_taken'] = None return my_render_to_response("exam/quizzes_user.html", context) context['quizzes'] = avail_quizzes context['user'] = user context['quizzes_taken'] = quizzes_taken return my_render_to_response("exam/quizzes_user.html", context) def intro(request, questionpaper_id): """Show introduction page before quiz starts""" user = request.user ci = RequestContext(request) quest_paper = QuestionPaper.objects.get(id=questionpaper_id) attempt_number = quest_paper.quiz.attempts_allowed time_lag = quest_paper.quiz.time_between_attempts if quest_paper.quiz.prerequisite: try: pre_quest = QuestionPaper.objects.get( quiz=quest_paper.quiz.prerequisite) answer_papers = AnswerPaper.objects.filter( question_paper=pre_quest, user=user) answer_papers_failed = AnswerPaper.objects.filter( question_paper=pre_quest, user=user, passed=False) if answer_papers.count() == answer_papers_failed.count(): context = {'user': user, 'cannot_attempt': True} return my_redirect("/exam/quizzes/?cannot_attempt=True") except: context = {'user': user, 'cannot_attempt': True} return my_redirect("/exam/quizzes/?cannot_attempt=True") attempted_papers = AnswerPaper.objects.filter(question_paper=quest_paper, user=user) already_attempted = attempted_papers.count() if already_attempted == 0: context = {'user': user, 'paper_id': questionpaper_id,\ 'attempt_num': already_attempted + 1} return my_render_to_response('exam/intro.html', context, context_instance=ci) if already_attempted == attempt_number: inprogress, previous_attempt = _check_previous_attempt(attempted_papers, already_attempted) if inprogress: return show_question(request, previous_attempt.current_question(), previous_attempt.attempt_number, previous_attempt.question_paper.id) else: return my_redirect("/exam/quizzes") if already_attempted < attempt_number or attempt_number < 0: inprogress, previous_attempt = _check_previous_attempt(attempted_papers, already_attempted) if inprogress: return show_question(request, previous_attempt.current_question(), previous_attempt.attempt_number, previous_attempt.question_paper.id) days_after_attempt = (datetime.datetime.today() - \ previous_attempt.start_time).days if days_after_attempt >= time_lag: context = {'user': user, 'paper_id': questionpaper_id,\ 'attempt_num': already_attempted + 1} return my_render_to_response('exam/intro.html', context, context_instance=ci) else: return my_redirect("/exam/quizzes/") else: return my_redirect("/exam/quizzes/") def _check_previous_attempt(attempted_papers, already_attempted): previous_attempt = attempted_papers[already_attempted-1] previous_attempt_day = previous_attempt.start_time today = datetime.datetime.today() if previous_attempt.status == 'inprogress': end_time = previous_attempt.end_time quiz_time = previous_attempt.question_paper.quiz.duration*60 if quiz_time > (today-previous_attempt_day).seconds: return True, previous_attempt else: return False, previous_attempt else: return False, previous_attempt def results_user(request): """Show list of Results of Quizzes that is taken by logged-in user.""" user = request.user papers = AnswerPaper.objects.filter(user=user) quiz_marks = [] for paper in papers: marks_obtained = paper.marks_obtained max_marks = paper.question_paper.total_marks percentage = round((marks_obtained/max_marks)*100, 2) temp = paper.question_paper.quiz.description, marks_obtained,\ max_marks, percentage quiz_marks.append(temp) context = {'papers': quiz_marks} return my_render_to_response("exam/results_user.html", context) def edit_quiz(request): """Edit the list of quizzes seleted by the user for editing.""" user = request.user if not user.is_authenticated() or not is_moderator(user): raise Http404('You are not allowed to view this page!') quiz_list = request.POST.getlist('quizzes') start_date = request.POST.getlist('start_date') duration = request.POST.getlist('duration') active = request.POST.getlist('active') description = request.POST.getlist('description') pass_criteria = request.POST.getlist('pass_criteria') language = request.POST.getlist('language') prerequisite = request.POST.getlist('prerequisite') for j, quiz_id in enumerate(quiz_list): quiz = Quiz.objects.get(id=quiz_id) quiz.start_date = start_date[j] quiz.duration = duration[j] quiz.active = active[j] quiz.description = description[j] quiz.pass_criteria = pass_criteria[j] quiz.language = language[j] quiz.prerequisite_id = prerequisite[j] quiz.save() return my_redirect("/exam/manage/showquiz/") def edit_question(request): """Edit the list of questions seleted by the user for editing.""" user = request.user if not user.is_authenticated() or not is_moderator(user): raise Http404('You are not allowed to view this page!') question_list = request.POST.getlist('questions') summary = request.POST.getlist('summary') description = request.POST.getlist('description') points = request.POST.getlist('points') test = request.POST.getlist('test') options = request.POST.getlist('options') type = request.POST.getlist('type') active = request.POST.getlist('active') language = request.POST.getlist('language') snippet = request.POST.getlist('snippet') for j, question_id in enumerate(question_list): question = Question.objects.get(id=question_id) question.summary = summary[j] question.description = description[j] question.points = points[j] question.test = test[j] question.options = options[j] question.active = active[j] question.language = language[j] question.snippet = snippet[j] question.type = type[j] question.save() return my_redirect("/exam/manage/questions") def add_question(request, question_id=None): """To add a new question in the database. Create a new question and store it.""" user = request.user ci = RequestContext(request) if not user.is_authenticated() or not is_moderator(user): raise Http404('You are not allowed to view this page!') if request.method == "POST": form = QuestionForm(request.POST) if form.is_valid(): data = form.cleaned_data if question_id is None: form.save() question = Question.objects.order_by("-id")[0] tags = form['tags'].data.split(',') for i in range(0, len(tags)-1): tag = tags[i].strip() question.tags.add(tag) return my_redirect("/exam/manage/questions") else: d = Question.objects.get(id=question_id) d.summary = form['summary'].data d.description = form['description'].data d.points = form['points'].data d.test = form['test'].data d.options = form['options'].data d.type = form['type'].data d.active = form['active'].data d.language = form['language'].data d.snippet = form['snippet'].data d.save() question = Question.objects.get(id=question_id) for tag in question.tags.all(): question.tags.remove(tag) tags = form['tags'].data.split(',') for i in range(0, len(tags)-1): tag = tags[i].strip() question.tags.add(tag) return my_redirect("/exam/manage/questions") else: return my_render_to_response('exam/add_question.html', {'form': form}, context_instance=ci) else: if question_id is None: form = QuestionForm() return my_render_to_response('exam/add_question.html', {'form': form}, context_instance=ci) else: d = Question.objects.get(id=question_id) form = QuestionForm() form.initial['summary'] = d.summary form.initial['description'] = d.description form.initial['points'] = d.points form.initial['test'] = d.test form.initial['options'] = d.options form.initial['type'] = d.type form.initial['active'] = d.active form.initial['language'] = d.language form.initial['snippet'] = d.snippet form_tags = d.tags.all() form_tags_split = form_tags.values('name') initial_tags = "" for tag in form_tags_split: initial_tags = initial_tags + str(tag['name']).strip() + "," if (initial_tags == ","): initial_tags = "" form.initial['tags'] = initial_tags return my_render_to_response('exam/add_question.html', {'form': form}, context_instance=ci) def add_quiz(request, quiz_id=None): """To add a new quiz in the database. Create a new quiz and store it.""" user = request.user ci = RequestContext(request) if not user.is_authenticated() or not is_moderator(user): raise Http404('You are not allowed to view this page!') if request.method == "POST": form = QuizForm(request.POST) if form.is_valid(): data = form.cleaned_data if quiz_id is None: form.save() quiz = Quiz.objects.order_by("-id")[0] return my_redirect("/exam/manage/designquestionpaper") else: d = Quiz.objects.get(id=quiz_id) d.start_date = form['start_date'].data d.duration = form['duration'].data d.active = form['active'].data d.description = form['description'].data d.pass_criteria = form['pass_criteria'].data d.language = form['language'].data d.prerequisite_id = form['prerequisite'].data d.attempts_allowed = form['attempts_allowed'].data d.time_between_attempts = form['time_between_attempts'].data d.save() quiz = Quiz.objects.get(id=quiz_id) return my_redirect("/exam/manage/showquiz") else: return my_render_to_response('exam/add_quiz.html', {'form': form}, context_instance=ci) else: if quiz_id is None: form = QuizForm() return my_render_to_response('exam/add_quiz.html', {'form': form}, context_instance=ci) else: d = Quiz.objects.get(id=quiz_id) form = QuizForm() form.initial['start_date'] = d.start_date form.initial['duration'] = d.duration form.initial['description'] = d.description form.initial['active'] = d.active form.initial['pass_criteria'] = d.pass_criteria form.initial['language'] = d.language form.initial['prerequisite'] = d.prerequisite_id form.initial['attempts_allowed'] = d.attempts_allowed form.initial['time_between_attempts'] = d.time_between_attempts return my_render_to_response('exam/add_quiz.html', {'form': form}, context_instance=ci) def show_all_questionpapers(request, questionpaper_id=None): user = request.user ci = RequestContext(request) if not user.is_authenticated() or not is_moderator(user): raise Http404('You are not allowed to view this page!') if request.method == "POST" and request.POST.get('add') == "add": return my_redirect("/exam/manage/designquestionpaper/" + questionpaper_id) if request.method == "POST" and request.POST.get('delete') == "delete": data = request.POST.getlist('papers') q_paper = QuestionPaper.objects.get(id=questionpaper_id) for i in data: q_paper.questions.remove(Question.objects.get(id=i)) question_paper = QuestionPaper.objects.all() context = {'papers': question_paper} return my_render_to_response('exam/showquestionpapers.html', context, context_instance=ci) if questionpaper_id is None: qu_papers = QuestionPaper.objects.all() context = {'papers': qu_papers} return my_render_to_response('exam/showquestionpapers.html', context, context_instance=ci) else: qu_papers = QuestionPaper.objects.get(id=questionpaper_id) quiz = qu_papers.quiz questions = qu_papers.questions.all() context = {'papers': {'quiz': quiz, 'questions': questions}} return my_render_to_response('exam/editquestionpaper.html', context, context_instance=ci) def automatic_questionpaper(request, questionpaper_id=None): """Generate automatic question paper for a particular quiz""" user = request.user ci = RequestContext(request) if not user.is_authenticated() or not is_moderator(user): raise Http404('You are not allowed to view this page!') if questionpaper_id is None: if request.method == "POST": if request.POST.get('save') == 'save': quiz = Quiz.objects.order_by("-id")[0] quest_paper = QuestionPaper() questions = request.POST.getlist('questions') tot_marks = 0 for quest in questions: q = Question.objects.get(id=quest) tot_marks += q.points quest_paper.quiz = quiz quest_paper.total_marks = tot_marks quest_paper.save() for quest in questions: q = Question.objects.get(id=quest) quest_paper.fixed_questions.add(q) return my_redirect('/exam/manage/showquiz') else: no_questions = int(request.POST.get('num_questions')) fetched_questions = fetch_questions(request) n = len(fetched_questions) msg = '' if (no_questions < n): i = n - no_questions for i in range(0, i): fetched_questions.pop() elif (no_questions > n): msg = 'The given Criteria does not satisfy the number\ of Questions...' tags = Tag.objects.all() context = {'data': {'questions': fetched_questions, 'tags': tags, 'msg': msg}} return my_render_to_response( 'exam/automatic_questionpaper.html', context, context_instance=ci) else: tags = Tag.objects.all() context = {'data': {'tags': tags}} return my_render_to_response('exam/automatic_questionpaper.html', context, context_instance=ci) else: if request.method == "POST": if request.POST.get('save') == 'save': quest_paper = QuestionPaper.objects.get(id=questionpaper_id) questions = request.POST.getlist('questions') tot_marks = quest_paper.total_marks for quest in questions: q = Question.objects.get(id=quest) tot_marks += q.points quest_paper.total_marks = tot_marks quest_paper.save() for quest in questions: q = Question.objects.get(id=quest) quest_paper.questions.add(q) return my_redirect('/exam/manage/showquiz') else: no_questions = int(request.POST.get('num_questions')) fetched_questions = fetch_questions(request) n = len(fetched_questions) msg = '' if(no_questions < n): i = n - no_questions for i in range(0, i): fetched_questions.pop() elif(no_questions > n): msg = 'The given Criteria does not satisfy the number of \ Questions...' tags = Tag.objects.all() context = {'data': {'questions': fetched_questions, 'tags': tags, 'msg': msg}} return my_render_to_response( 'exam/automatic_questionpaper.html', context, context_instance=ci) else: tags = Tag.objects.all() context = {'data': {'tags': tags}} return my_render_to_response('exam/automatic_questionpaper.html', context, context_instance=ci) def manual_questionpaper(request, questionpaper_id=None): user = request.user ci = RequestContext(request) if not user.is_authenticated() or not is_moderator(user): raise Http404('You are not allowed to view this page!') if questionpaper_id is None: if request.method == "POST": if request.POST.get('save') == 'save': questions = request.POST.getlist('questions') quest_paper = QuestionPaper() quiz = Quiz.objects.order_by("-id")[0] tot_marks = 0 for quest in questions: q = Question.objects.get(id=quest) tot_marks += q.points quest_paper.quiz = quiz quest_paper.total_marks = tot_marks quest_paper.save() for i in questions: q = Question.objects.get(id=i) quest_paper.questions.add(q) return my_redirect('/exam/manage/showquiz') else: fetched_questions = fetch_questions(request) n = len(fetched_questions) msg = '' if (n == 0): msg = 'No matching Question found...' tags = Tag.objects.all() context = {'data': {'questions': fetched_questions, 'tags': tags, 'msg': msg}} return my_render_to_response('exam/manual_questionpaper.html', context, context_instance=ci) else: tags = Tag.objects.all() context = {'data': {'tags': tags}} return my_render_to_response('exam/manual_questionpaper.html', context, context_instance=ci) else: if request.method == "POST": if request.POST.get('save') == 'save': quest_paper = QuestionPaper.objects.get(id=questionpaper_id) questions = request.POST.getlist('questions') tot_marks = quest_paper.total_marks for quest in questions: q = Question.objects.get(id=quest) tot_marks += q.points quest_paper.total_marks = tot_marks quest_paper.save() for i in questions: q = Question.objects.get(id=i) quest_paper.questions.add(q) return my_redirect('/exam/manage/showquiz') else: fetched_questions = fetch_questions(request) n = len(fetched_questions) msg = '' if (n == 0): msg = 'No matching Question found...' tags = Tag.objects.all() context = {'data': {'questions': fetched_questions, 'tags': tags, 'msg': msg}} return my_render_to_response('exam/manual_questionpaper.html', context, context_instance=ci) else: tags = Tag.objects.all() context = {'data': {'tags': tags}} return my_render_to_response('exam/manual_questionpaper.html', context, context_instance=ci) def prof_manage(request): """Take credentials of the user with professor/moderator rights/permissions and log in.""" user = request.user if user.is_authenticated() and is_moderator(user): question_papers = QuestionPaper.objects.all() users_per_paper = [] for paper in question_papers: answer_papers = AnswerPaper.objects.filter(question_paper=paper) users_passed = AnswerPaper.objects.filter(question_paper=paper, passed=True).count() users_failed = AnswerPaper.objects.filter(question_paper=paper, passed=False).count() temp = paper, answer_papers, users_passed, users_failed users_per_paper.append(temp) context = {'user': user, 'users_per_paper': users_per_paper} return my_render_to_response('manage.html', context) return my_redirect('/exam/login/') def user_login(request): """Take the credentials of the user and log the user in.""" user = request.user ci = RequestContext(request) if user.is_authenticated(): if user.groups.filter(name='moderator').count() > 0: return my_redirect('/exam/manage/') return my_redirect("/exam/intro/") if request.method == "POST": form = UserLoginForm(request.POST) if form.is_valid(): user = form.cleaned_data login(request, user) if user.groups.filter(name='moderator').count() > 0: return my_redirect('/exam/manage/') return my_redirect('/exam/login/') else: context = {"form": form} return my_render_to_response('exam/login.html', context, context_instance=ci) else: form = UserLoginForm() context = {"form": form} return my_render_to_response('exam/login.html', context, context_instance=ci) def start(request, attempt_num=None, questionpaper_id=None): """Check the user cedentials and if any quiz is available, start the exam.""" user = request.user if questionpaper_id is None: return my_redirect('/exam/quizzes/') try: """Right now the app is designed so there is only one active quiz at a particular time.""" questionpaper = QuestionPaper.objects.get(id=questionpaper_id) except QuestionPaper.DoesNotExist: msg = 'Quiz not found, please contact your '\ 'instructor/administrator. Please login again thereafter.' return complete(request, msg, attempt_num, questionpaper_id) try: old_paper = AnswerPaper.objects.get( question_paper=questionpaper, user=user, attempt_number=attempt_num) q = old_paper.current_question() return show_question(request, q, attempt_num, questionpaper_id) except AnswerPaper.DoesNotExist: ip = request.META['REMOTE_ADDR'] key = gen_key(10) try: profile = user.get_profile() except Profile.DoesNotExist: msg = 'You do not have a profile and cannot take the quiz!' raise Http404(msg) new_paper = questionpaper.make_answerpaper(user, ip, attempt_num) # Make user directory. user_dir = get_user_dir(user) return start(request, attempt_num, questionpaper_id) def get_questions(paper): ''' Takes answerpaper as an argument. Returns the total questions as ordered dictionary, the questions yet to attempt and the questions attempted ''' to_attempt = [] submitted = [] all_questions = [] questions = {} if paper.questions: to_attempt = (paper.questions).split('|') if paper.questions_answered: submitted = (paper.questions_answered).split('|') if not to_attempt: submitted.sort() all_questions = submitted if not submitted: to_attempt.sort() all_questions = to_attempt if to_attempt and submitted: q_append = to_attempt + submitted q_append.sort() all_questions = q_append for num, value in enumerate(all_questions, 1): questions[value] = num questions = collections.OrderedDict(sorted(questions.items())) return questions, to_attempt, submitted def question(request, q_id, attempt_num, questionpaper_id, success_msg=None): """Check the credentials of the user and start the exam.""" user = request.user if not user.is_authenticated(): return my_redirect('/exam/login/') q = get_object_or_404(Question, pk=q_id) try: q_paper = QuestionPaper.objects.get(id=questionpaper_id) paper = AnswerPaper.objects.get( user=request.user, attempt_number=attempt_num, question_paper=q_paper) except AnswerPaper.DoesNotExist: return my_redirect('/exam/start/') if not paper.question_paper.quiz.active: reason = 'The quiz has been deactivated!' return complete(request, reason, questionpaper_id) elif paper.end_time < datetime.datetime.now(): reason = 'You have already attempted the quiz' return complete(request, reason, questionpaper_id) time_left = paper.time_left() if time_left == 0: return complete(request, reason='Your time is up!') quiz_name = paper.question_paper.quiz.description questions, to_attempt, submitted = get_questions(paper) if success_msg is None: context = {'question': q, 'questions': questions, 'paper': paper, 'user': user, 'quiz_name': quiz_name, 'time_left': time_left, 'to_attempt': to_attempt, 'submitted': submitted} else: context = {'question': q, 'questions': questions, 'paper': paper, 'user': user, 'quiz_name': quiz_name, 'time_left': time_left, 'success_msg': success_msg, 'to_attempt': to_attempt, 'submitted': submitted} if q.type == 'code': skipped_answer = paper.answers.filter(question=q, skipped=True) if skipped_answer: context['last_attempt'] = skipped_answer[0].answer ci = RequestContext(request) return my_render_to_response('exam/question.html', context, context_instance=ci) def show_question(request, q_id, attempt_num, questionpaper_id, success_msg=None): """Show a question if possible.""" user = request.user q_paper = QuestionPaper.objects.get(id=questionpaper_id) paper = AnswerPaper.objects.get(user=request.user, attempt_number=attempt_num, question_paper=q_paper) if not user.is_authenticated() or paper.end_time < datetime.datetime.now(): return my_redirect('/exam/login/') old_qid = request.POST.get('question_id') if old_qid is not None: quest = Question.objects.get(pk=old_qid) user_code = request.POST.get('answer') if quest.type == 'code': old_skipped = paper.answers.filter(question=quest, skipped=True) _save_skipped_answer(old_skipped, user_code, paper, quest) if len(q_id) == 0: msg = 'Congratulations! You have successfully completed the quiz.' return complete(request, msg, attempt_num, questionpaper_id) else: return question(request, q_id, attempt_num, questionpaper_id, success_msg) def _save_skipped_answer(old_skipped, user_answer, paper, question): """ Saves the answer on skip. Only the code questions are saved. Snippet is not saved with the answer. """ if old_skipped: skipped_answer = old_skipped[0] skipped_answer.answer=user_answer skipped_answer.save() else: skipped_answer = Answer(question=question, answer=user_answer, correct=False, skipped=True) skipped_answer.save() paper.answers.add(skipped_answer) def check(request, q_id, attempt_num=None, questionpaper_id=None): """Checks the answers of the user for particular question""" user = request.user q_paper = QuestionPaper.objects.get(id=questionpaper_id) paper = AnswerPaper.objects.get(user=request.user, attempt_number=attempt_num, question_paper=q_paper) if q_id in paper.questions_answered: next_q = paper.skip() return show_question(request, next_q, attempt_num, questionpaper_id) if not user.is_authenticated() or paper.end_time < datetime.datetime.now(): return my_redirect('/exam/login/') question = get_object_or_404(Question, pk=q_id) q_paper = QuestionPaper.objects.get(id=questionpaper_id) paper = AnswerPaper.objects.get(user=request.user, question_paper=q_paper) test = TestCase.objects.filter(question=question) test_parameter = question.consolidate_test_cases(test) snippet_code = request.POST.get('snippet') user_code = request.POST.get('answer') skip = request.POST.get('skip', None) success_msg = False success = True if skip is not None: if question.type == 'code': old_skipped = paper.answers.filter(question=question, skipped=True) _save_skipped_answer(old_skipped, user_code, paper, question) next_q = paper.skip() return show_question(request, next_q, attempt_num, questionpaper_id) # Add the answer submitted, regardless of it being correct or not. if question.type == 'mcq': user_answer = request.POST.get('answer') elif question.type == 'mcc': user_answer = request.POST.getlist('answer') elif question.type == 'upload': assign = AssignmentUpload() assign.user = user.profile assign.assignmentQuestion = question # if time-up at upload question then the form is submitted without # validation if 'assignment' in request.FILES: assign.assignmentFile = request.FILES['assignment'] assign.save() user_answer = 'ASSIGNMENT UPLOADED' else: user_code = request.POST.get('answer') user_answer = user_code #snippet_code + "\n" + user_code new_answer = Answer(question=question, answer=user_answer, correct=False) new_answer.save() paper.answers.add(new_answer) # If we were not skipped, we were asked to check. For any non-mcq # questions, we obtain the results via XML-RPC with the code executed # safely in a separate process (the code_server.py) running as nobody. if not question.type == 'upload': correct, result = validate_answer(user, user_answer, question, test_parameter) if correct: new_answer.correct = correct new_answer.marks = question.points new_answer.error = err_msg success_msg = True else: new_answer.error = err_msg new_answer.save() time_left = paper.time_left() if not result.get('success'): # Should only happen for non-mcq questions. if time_left == 0: reason = 'Your time is up!' return complete(request, reason, attempt_num, questionpaper_id) if not paper.question_paper.quiz.active: reason = 'The quiz has been deactivated!' return complete(request, reason, attempt_num, questionpaper_id) if not paper.question_paper.quiz.active: reason = 'The quiz has been deactivated!' return complete(request, reason, attempt_num, questionpaper_id) questions, to_attempt, submitted = get_questions(paper) old_answer = paper.answers.filter(question=question, skipped=True) if old_answer: old_answer[0].answer = user_code old_answer[0].save() context = {'question': question, 'error_message': result.get('error'), 'paper': paper, 'last_attempt': user_code, 'quiz_name': paper.question_paper.quiz.description, 'time_left': time_left, 'to_attempt': to_attempt, 'submitted': submitted} ci = RequestContext(request) return my_render_to_response('exam/question.html', context, context_instance=ci) else: if time_left <= 0: reason = 'Your time is up!' return complete(request, reason, attempt_num, questionpaper_id) else: next_q = paper.completed_question(question.id) return show_question(request, next_q, attempt_num, questionpaper_id, success_msg) def validate_answer(user, user_answer, question, test_parameter): """ Checks whether the answer submitted by the user is right or wrong. If right then returns correct = True, success and message = Correct answer. success is True for MCQ's and multiple correct choices because only one attempt are allowed for them. For code questions success is True only if the answer is correct. """ result = {'success': True, 'error': 'Incorrect answer'} correct = False if user_answer is not None: if question.type == 'mcq': if user_answer.strip() == question.test.strip(): correct = True message = 'Correct answer' elif question.type == 'mcc': answers = set(question.test.splitlines()) if set(user_answer) == answers: correct = True message = 'Correct answer' elif question.type == 'code': user_dir = get_user_dir(user) result = code_server.run_code(user_answer, test_parameter, user_dir, question.language) if result.get('success'): correct = True return correct, result def quit(request, attempt_num=None, questionpaper_id=None): """Show the quit page when the user logs out.""" context = {'id': questionpaper_id, 'attempt_num': attempt_num} return my_render_to_response('exam/quit.html', context, context_instance=RequestContext(request)) def complete(request, reason=None, attempt_num=None, questionpaper_id=None): """Show a page to inform user that the quiz has been compeleted.""" user = request.user if questionpaper_id is None: logout(request) message = reason or "You are successfully logged out." context = {'message': message} return my_render_to_response('exam/complete.html', context) else: q_paper = QuestionPaper.objects.get(id=questionpaper_id) paper = AnswerPaper.objects.get(user=user, question_paper=q_paper, attempt_number=attempt_num) paper.update_marks_obtained() paper.update_percent() paper.update_passed() paper.end_time = datetime.datetime.now() paper.update_status() paper.save() obt_marks = paper.marks_obtained tot_marks = paper.question_paper.total_marks if obt_marks == paper.question_paper.total_marks: context = {'message': "Hurray ! You did an excellent job.\ you answered all the questions correctly.\ You have been logged out successfully,\ Thank You !"} return my_render_to_response('exam/complete.html', context) else: message = reason or "You are successfully logged out" context = {'message': message} return my_render_to_response('exam/complete.html', context) no = False message = reason or 'The quiz has been completed. Thank you.' if user.groups.filter(name='moderator').count() > 0: message = 'You are successfully Logged out.' if request.method == 'POST' and 'no' in request.POST: no = True if not no: # Logout the user and quit with the message given. answer_paper = AnswerPaper.objects.get(id=answerpaper_id) answer_paper.end_time = datetime.datetime.now() answer_paper.save() return my_redirect('/exam/quizzes/') else: return my_redirect('/exam/') def monitor(request, questionpaper_id=None): """Monitor the progress of the papers taken so far.""" user = request.user ci = RequestContext(request) if not user.is_authenticated() or not is_moderator(user): raise Http404('You are not allowed to view this page!') if questionpaper_id is None: q_paper = QuestionPaper.objects.all() context = {'papers': [], 'quiz': None, 'quizzes': q_paper} return my_render_to_response('exam/monitor.html', context, context_instance=ci) # quiz_id is not None. try: q_paper = QuestionPaper.objects.get(id=questionpaper_id) except QuestionPaper.DoesNotExist: papers = [] q_paper = None else: papers = AnswerPaper.objects.filter(question_paper=q_paper).annotate( total=Sum('answers__marks')).order_by('-total') context = {'papers': papers, 'quiz': q_paper, 'quizzes': None} return my_render_to_response('exam/monitor.html', context, context_instance=ci) def get_user_data(username): """For a given username, this returns a dictionary of important data related to the user including all the user's answers submitted. """ user = User.objects.get(username=username) papers = AnswerPaper.objects.filter(user=user) data = {} try: profile = user.get_profile() except Profile.DoesNotExist: # Admin user may have a paper by accident but no profile. profile = None data['user'] = user data['profile'] = profile data['papers'] = papers return data def show_all_users(request): """Shows all the users who have taken various exams/quiz.""" user = request.user if not user.is_authenticated() or not is_moderator(user): raise Http404('You are not allowed to view this page !') user = User.objects.filter(username__contains="") questionpaper = AnswerPaper.objects.all() context = {'question': questionpaper} return my_render_to_response('exam/showusers.html', context, context_instance=RequestContext(request)) def show_all_quiz(request): """Generates a list of all the quizzes that are currently in the database.""" user = request.user ci = RequestContext(request) if not user.is_authenticated() or not is_moderator(user): raise Http404('You are not allowed to view this page !') if request.method == 'POST' and request.POST.get('delete') == 'delete': data = request.POST.getlist('quiz') if data is None: quizzes = Quiz.objects.all() context = {'papers': [], 'quiz': None, 'quizzes': quizzes} return my_render_to_response('exam/show_quiz.html', context, context_instance=ci) else: for i in data: quiz = Quiz.objects.get(id=i).delete() quizzes = Quiz.objects.all() context = {'papers': [], 'quiz': None, 'quizzes': quizzes} return my_render_to_response('exam/show_quiz.html', context, context_instance=ci) elif request.method == 'POST' and request.POST.get('edit') == 'edit': data = request.POST.getlist('quiz') forms = [] for j in data: d = Quiz.objects.get(id=j) form = QuizForm() form.initial['start_date'] = d.start_date form.initial['duration'] = d.duration form.initial['active'] = d.active form.initial['description'] = d.description form.initial['pass_criteria'] = d.pass_criteria form.initial['language'] = d.language form.initial['prerequisite'] = d.prerequisite_id forms.append(form) return my_render_to_response('exam/edit_quiz.html', {'forms': forms, 'data': data}, context_instance=ci) else: quizzes = Quiz.objects.all() context = {'papers': [], 'quiz': None, 'quizzes': quizzes} return my_render_to_response('exam/show_quiz.html', context, context_instance=ci) def show_all_questions(request): """Show a list of all the questions currently in the databse.""" user = request.user ci = RequestContext(request) if not user.is_authenticated() or not is_moderator(user): raise Http404("You are not allowed to view this page !") if request.method == 'POST' and request.POST.get('delete') == 'delete': data = request.POST.getlist('question') if data is None: questions = Question.objects.all() context = {'papers': [], 'question': None, 'questions': questions} return my_render_to_response('exam/showquestions.html', context, context_instance=ci) else: for i in data: question = Question.objects.get(id=i).delete() questions = Question.objects.all() context = {'papers': [], 'question': None, 'questions': questions} return my_render_to_response('exam/showquestions.html', context, context_instance=ci) elif request.method == 'POST' and request.POST.get('edit') == 'edit': data = request.POST.getlist('question') forms = [] for j in data: d = Question.objects.get(id=j) form = QuestionForm() form.initial['summary'] = d.summary form.initial['description'] = d.description form.initial['points'] = d.points form.initial['test'] = d.test form.initial['options'] = d.options form.initial['type'] = d.type form.initial['active'] = d.active form.initial['language'] = d.language form.initial['snippet'] = d.snippet form_tags = d.tags.all() form_tags_split = form_tags.values('name') initial_tags = "" for tag in form_tags_split: initial_tags = initial_tags + str(tag['name']).strip() + "," if (initial_tags == ","): initial_tags = "" form.initial['tags'] = initial_tags forms.append(form) return my_render_to_response('exam/edit_question.html', {'forms': forms, 'data': data}, context_instance=ci) else: questions = Question.objects.all() context = {'papers': [], 'question': None, 'questions': questions} return my_render_to_response('exam/showquestions.html', context, context_instance=ci) def user_data(request, username): """Render user data.""" current_user = request.user if not current_user.is_authenticated() or not is_moderator(current_user): raise Http404('You are not allowed to view this page!') data = get_user_data(username) context = {'data': data} return my_render_to_response('exam/user_data.html', context, context_instance=RequestContext(request)) def grade_user(request, username): """Present an interface with which we can easily grade a user's papers and update all their marks and also give comments for each paper. """ current_user = request.user ci = RequestContext(request) if not current_user.is_authenticated() or not is_moderator(current_user): raise Http404('You are not allowed to view this page!') data = get_user_data(username) if request.method == 'POST': papers = data['papers'] for paper in papers: for question, answers in paper.get_question_answers().iteritems(): marks = float(request.POST.get('q%d_marks' % question.id)) last_ans = answers[-1] last_ans.marks = marks last_ans.save() paper.comments = request.POST.get( 'comments_%d' % paper.question_paper.id) paper.save() context = {'data': data} return my_render_to_response('exam/user_data.html', context, context_instance=ci) else: context = {'data': data} return my_render_to_response('exam/grade_user.html', context, context_instance=ci) @csrf_exempt def ajax_questionpaper(request, query): """ During question paper creation, ajax call made to get question details. """ if query == 'marks': question_type = request.POST.get('question_type') questions = Question.objects.filter(type=question_type) marks = questions.values_list('points').distinct() return my_render_to_response('exam/ajax_marks.html', {'marks': marks}) elif query == 'questions': question_type = request.POST['question_type'] marks_selected = request.POST['marks'] fixed_questions = request.POST.getlist('fixed_list[]') fixed_question_list = ",".join(fixed_questions).split(',') random_questions = request.POST.getlist('random_list[]') random_question_list = ",".join(random_questions).split(',') question_list = fixed_question_list + random_question_list questions = list(Question.objects.filter(type=question_type, points=marks_selected)) questions = [question for question in questions \ if not str(question.id) in question_list] return my_render_to_response('exam/ajax_questions.html', {'questions': questions}) def design_questionpaper(request): user = request.user ci = RequestContext(request) if not user.is_authenticated() or not is_moderator(user): raise Http404('You are not allowed to view this page!') if request.method == 'POST': fixed_questions = request.POST.getlist('fixed') random_questions = request.POST.getlist('random') random_number = request.POST.getlist('number') is_shuffle = request.POST.get('shuffle_questions', False) if is_shuffle == 'on': is_shuffle = True question_paper = QuestionPaper(shuffle_questions=is_shuffle) quiz = Quiz.objects.order_by("-id")[0] tot_marks = 0 question_paper.quiz = quiz question_paper.total_marks = tot_marks question_paper.save() if fixed_questions: fixed_questions_ids = ",".join(fixed_questions) fixed_questions_ids_list = fixed_questions_ids.split(',') for question_id in fixed_questions_ids_list: question_paper.fixed_questions.add(question_id) if random_questions: for random_question, num in zip(random_questions, random_number): qid = random_question.split(',')[0] question = Question.objects.get(id=int(qid)) marks = question.points question_set = QuestionSet(marks=marks, num_questions=num) question_set.save() for question_id in random_question.split(','): question_set.questions.add(question_id) question_paper.random_questions.add(question_set) question_paper.update_total_marks() question_paper.save() return my_redirect('/exam/manage/showquiz') else: form = RandomQuestionForm() context = {'form': form} return my_render_to_response('exam/design_questionpaper.html', context, context_instance=ci)