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import random
import string
import os
import stat
from os.path import dirname, pardir, abspath, join, exists
import datetime
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 exam.models import Quiz, Question, QuestionPaper, Profile, Answer
from exam.forms import UserRegisterForm, UserLoginForm
from exam.xmlrpc_clients import python_server
# The directory where user data can be saved.
OUTPUT_DIR = abspath(join(dirname(__file__), pardir, 'output'))
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."""
return join(OUTPUT_DIR, str(user.username))
def index(request):
"""The start page.
"""
user = request.user
if user.is_authenticated():
return redirect("/exam/start/")
return 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
if user.is_authenticated():
return 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 redirect("/exam/start/")
else:
return render_to_response('exam/register.html',{'form':form},
context_instance=RequestContext(request))
else:
form = UserRegisterForm()
return render_to_response('exam/register.html',{'form':form},
context_instance=RequestContext(request))
def user_login(request):
"""Take the credentials of the user and log the user in."""
user = request.user
if user.is_authenticated():
return redirect("/exam/start/")
if request.method == "POST":
form = UserLoginForm(request.POST)
if form.is_valid():
user = form.cleaned_data
login(request, user)
return redirect("/exam/start/")
else:
context = {"form": form,}
return render_to_response('exam/login.html', context,
context_instance=RequestContext(request))
else:
form = UserLoginForm()
context = {"form": form}
return render_to_response('exam/login.html', context,
context_instance=RequestContext(request))
def start(request):
user = request.user
try:
# Right now the app is designed so there is only one active quiz
# at a particular time.
quiz = Quiz.objects.get(active=True)
except Quiz.DoesNotExist:
msg = 'No active quiz found, please contact your '\
'instructor/administrator. Please login again thereafter.'
return complete(request, reason=msg)
try:
old_paper = QuestionPaper.objects.get(user=user, quiz=quiz)
q = old_paper.current_question()
return show_question(request, q)
except QuestionPaper.DoesNotExist:
ip = request.META['REMOTE_ADDR']
key = gen_key(10)
new_paper = QuestionPaper(user=user, user_ip=ip, key=key, quiz=quiz)
new_paper.start_time = datetime.datetime.now()
# Make user directory.
user_dir = get_user_dir(user)
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)
questions = [ str(_.id) for _ in Question.objects.all() ]
random.shuffle(questions)
new_paper.questions = "|".join(questions)
new_paper.save()
# Show the user the intro page.
context = {'user': user}
ci = RequestContext(request)
return render_to_response('exam/intro.html', context,
context_instance=ci)
def question(request, q_id):
user = request.user
q = get_object_or_404(Question, pk=q_id)
try:
paper = QuestionPaper.objects.get(user=request.user)
except QuestionPaper.DoesNotExist:
redirect('/exam/start')
time_left = paper.time_left()
if time_left == 0:
return complete(request, reason='Your time is up!')
quiz_name = paper.quiz.description
context = {'question': q, 'paper': paper, 'user': user,
'quiz_name': quiz_name,
'time_left': time_left}
ci = RequestContext(request)
return render_to_response('exam/question.html', context,
context_instance=ci)
def show_question(request, q_id):
"""Show a question if possible."""
if len(q_id) == 0:
msg = 'Congratulations! You have successfully completed the quiz.'
return complete(request, msg)
else:
return question(request, q_id)
def check(request, q_id):
user = request.user
question = get_object_or_404(Question, pk=q_id)
paper = QuestionPaper.objects.get(user=user)
answer = request.POST.get('answer')
skip = request.POST.get('skip', None)
if skip is not None:
next_q = paper.skip()
return show_question(request, next_q)
# Add the answer submitted, regardless of it being correct or not.
new_answer = Answer(question=question, answer=answer, correct=False)
new_answer.save()
paper.answers.add(new_answer)
# Otherwise we were asked to check. We obtain the results via XML-RPC
# with the code executed safely in a separate process (the python_server.py)
# running as nobody.
user_dir = get_user_dir(user)
success, err_msg = python_server.run_code(answer, question.test, user_dir)
if success:
# Note the success and save it.
new_answer.correct = success
new_answer.save()
ci = RequestContext(request)
if not success:
time_left = paper.time_left()
if time_left == 0:
return complete(request, reason='Your time is up!')
context = {'question': question, 'error_message': err_msg,
'paper': paper, 'last_attempt': answer,
'quiz_name': paper.quiz.description,
'time_left': time_left}
return render_to_response('exam/question.html', context,
context_instance=ci)
else:
next_q = paper.answered_question(question.id)
return show_question(request, next_q)
def quit(request):
return render_to_response('exam/quit.html',
context_instance=RequestContext(request))
def complete(request, reason=None):
user = request.user
no = False
message = reason or 'The quiz has been completed. Thank you.'
if request.method == 'POST' and 'no' in request.POST:
no = request.POST.get('no', False)
if not no:
# Logout the user and quit with the message given.
logout(request)
context = {'message': message}
return render_to_response('exam/complete.html', context)
else:
return redirect('/exam/')
def monitor(request):
"""Monitor the progress of the papers taken so far."""
q_papers = QuestionPaper.objects.all()
questions = Question.objects.all()
# Mapping from question id to points
marks = dict( ( (q.id, q.points) for q in questions) )
paper_list = []
for q_paper in q_papers:
paper = {}
user = q_paper.user
try:
profile = Profile.objects.get(user=user)
except Profile.DoesNotExist:
# Admin user may have a paper by accident but no profile.
continue
paper['username'] = str(user.first_name) + ' ' + str(user.last_name)
paper['rollno'] = str(profile.roll_number)
qa = q_paper.questions_answered.split('|')
answered = ', '.join(sorted(qa))
paper['answered'] = answered if answered else 'None'
total = sum( [marks[int(id)] for id in qa if id] )
paper['total'] = total
paper_list.append(paper)
paper_list.sort(cmp=lambda x, y: cmp(x['total'], y['total']),
reverse=True)
context = {'paper_list': paper_list}
return render_to_response('exam/monitor.html', context,
context_instance=RequestContext(request))
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