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Port the forum app to the new framework. With it also comes new cookie
infrastructure.

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ivle/webapp/tutorial/service.py
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'''AJAX backend for the tutorial application.'''
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import os
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import datetime
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import genshi
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from storm.locals import Store
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import ivle.util
 
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import ivle.console
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import ivle.database
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from ivle.database import Exercise, ExerciseAttempt, ExerciseSave, Worksheet, \
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                          Offering, Subject, Semester, User, WorksheetExercise
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import ivle.worksheet.utils
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from ivle.webapp.base.rest import (JSONRESTView, named_operation,
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                                   require_permission)
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from ivle.webapp.errors import NotFound
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import ivle.worksheet
 
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import ivle.conf
 
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import ivle.webapp.tutorial.test
 
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from ivle.webapp.base.rest import JSONRESTView, named_operation
 
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# If True, getattempts or getattempt will allow browsing of inactive/disabled
 
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# attempts. If False, will not allow this.
 
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HISTORY_ALLOW_INACTIVE = False
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TIMESTAMP_FORMAT = '%Y-%m-%d %H:%M:%S'
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class AttemptsRESTView(JSONRESTView):
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    '''REST view of a user's attempts at an exercise.'''
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    @require_permission('edit')
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    def GET(self, req):
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        """Handles a GET Attempts action."""
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        attempts = req.store.find(ExerciseAttempt, 
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                ExerciseAttempt.ws_ex_id == self.context.worksheet_exercise.id,
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                ExerciseAttempt.user_id == self.context.user.id)
 
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        exercise = ivle.database.Exercise.get_by_name(req.store, 
 
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                                                        self.exercise)
 
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        user = ivle.database.User.get_by_login(req.store, self.username)
 
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        attempts = ivle.worksheet.get_exercise_attempts(req.store, user,
 
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                            exercise, allow_inactive=HISTORY_ALLOW_INACTIVE)
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        # attempts is a list of ExerciseAttempt objects. Convert to dictionaries
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        time_fmt = lambda dt: datetime.datetime.strftime(dt, TIMESTAMP_FORMAT)
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        attempts = [{'date': time_fmt(a.date), 'complete': a.complete}
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        return attempts
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    @require_permission('edit')
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    def PUT(self, req, data):
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        """ Tests the given submission """
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        test_results = ivle.worksheet.utils.test_exercise_submission(
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            req.config, req.user, self.context.worksheet_exercise.exercise,
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            data['code'])
 
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        ''' Tests the given submission '''
 
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        exercisefile = ivle.util.open_exercise_file(self.exercise)
 
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        if exercisefile is None:
 
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            req.throw_error(req.HTTP_NOT_FOUND,
 
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                "The exercise was not found.")
 
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        # Start a console to run the tests on
 
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        jail_path = os.path.join(ivle.conf.jail_base, req.user.login)
 
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        working_dir = os.path.join("/home", req.user.login)
 
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        cons = ivle.console.Console(req.user.unixid, jail_path, working_dir)
 
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        # Parse the file into a exercise object using the test suite
 
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        exercise_obj = ivle.webapp.tutorial.test.parse_exercise_file(
 
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                                                            exercisefile, cons)
 
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        exercisefile.close()
 
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        # Run the test cases. Get the result back as a JSONable object.
 
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        # Return it.
 
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        test_results = exercise_obj.run_tests(data['code'])
 
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        # Close the console
 
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        cons.close()
 
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        # Get the Exercise from the database
 
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        exercise = ivle.database.Exercise.get_by_name(req.store, self.exercise)
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        attempt = ivle.database.ExerciseAttempt(user=req.user,
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            worksheet_exercise = self.context.worksheet_exercise,
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            date = datetime.datetime.now(),
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            complete = test_results['passed'],
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            text = unicode(data['code'])
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        )
 
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                                                exercise=exercise,
 
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                                                date=datetime.datetime.now(),
 
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                                                complete=test_results['passed'],
 
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                                                # XXX
 
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                                                text=unicode(data['code']))
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        req.store.add(attempt)
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        # Query the DB to get an updated score on whether or not this problem
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        # has EVER been completed (may be different from "passed", if it has
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        # been completed before), and the total number of attempts.
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        completed, attempts = ivle.worksheet.utils.get_exercise_status(
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                req.store, req.user, self.context.worksheet_exercise)
 
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        completed, attempts = ivle.worksheet.get_exercise_status(req.store,
 
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            req.user, exercise)
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        test_results["completed"] = completed
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        test_results["attempts"] = attempts
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class AttemptRESTView(JSONRESTView):
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    '''REST view of an exercise attempt.'''
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    @require_permission('view')
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    def GET(self, req):
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        return {'code': self.context.text}
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class WorksheetExerciseRESTView(JSONRESTView):
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    '''REST view of a worksheet exercise.'''
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    @named_operation('view')
 
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        # Get an actual date object, rather than a string
 
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        date = datetime.datetime.strptime(self.date, TIMESTAMP_FORMAT)
 
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        exercise = ivle.database.Exercise.get_by_name(req.store, self.exercise)
 
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        attempt = ivle.worksheet.get_exercise_attempt(req.store, req.user,
 
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            exercise, as_of=date, allow_inactive=HISTORY_ALLOW_INACTIVE)
 
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        if attempt is not None:
 
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            attempt = attempt.text
 
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        # attempt may be None; will write "null"
 
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        return {'code': attempt}
 
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class ExerciseRESTView(JSONRESTView):
 
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    '''REST view of an exercise.'''
 
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    @named_operation
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    def save(self, req, text):
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        # Find the appropriate WorksheetExercise to save to. If its not found,
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        # the user is submitting against a non-existant worksheet/exercise
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        old_save = req.store.find(ExerciseSave,
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            ExerciseSave.ws_ex_id == self.context.id,
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            ExerciseSave.user == req.user).one()
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        #Overwrite the old, or create a new if there isn't one
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        if old_save is None:
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            new_save = ExerciseSave()
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            req.store.add(new_save)
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        else:
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            new_save = old_save
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        new_save.worksheet_exercise = self.context
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        new_save.user = req.user
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        new_save.text = unicode(text)
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        new_save.date = datetime.datetime.now()
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        # Need to open JUST so we know this is a real exercise.
 
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        # (This avoids users submitting code for bogus exercises).
 
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        exercisefile = ivle.util.open_exercise_file(self.exercise)
 
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        if exercisefile is None:
 
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            req.throw_error(req.HTTP_NOT_FOUND,
 
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                "The exercise was not found.")
 
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        exercisefile.close()
 
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        exercise = ivle.database.Exercise.get_by_name(req.store, self.exercise)
 
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        ivle.worksheet.save_exercise(req.store, req.user, exercise,
 
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                                     unicode(text), datetime.datetime.now())
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        return {"result": "ok"}
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class WorksheetsRESTView(JSONRESTView):
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    """View used to update and create Worksheets."""
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    @named_operation('edit_worksheets')
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    def move_up(self, req, worksheetid):
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        """Takes a list of worksheet-seq_no pairs and updates their 
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        corresponding Worksheet objects to match."""
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        worksheet_below = req.store.find(Worksheet,
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            Worksheet.offering_id == self.context.id,
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            Worksheet.identifier == unicode(worksheetid)).one()
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        if worksheet_below is None:
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            raise NotFound('worksheet_below')
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        worksheet_above = req.store.find(Worksheet,
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            Worksheet.offering_id == self.context.id,
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            Worksheet.seq_no == (worksheet_below.seq_no - 1)).one()
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        if worksheet_above is None:
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            raise NotFound('worksheet_above')
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        worksheet_below.seq_no = worksheet_below.seq_no - 1
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        worksheet_above.seq_no = worksheet_above.seq_no + 1
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        return {'result': 'ok'}
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    @named_operation('edit_worksheets')
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    def move_down(self, req, worksheetid):
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        """Takes a list of worksheet-seq_no pairs and updates their 
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        corresponding Worksheet objects to match."""
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        worksheet_above = req.store.find(Worksheet,
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            Worksheet.offering_id == self.context.id,
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            Worksheet.identifier == unicode(worksheetid)).one()
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        if worksheet_above is None:
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            raise NotFound('worksheet_below')
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        worksheet_below = req.store.find(Worksheet,
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            Worksheet.offering_id == self.context.id,
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            Worksheet.seq_no == (worksheet_above.seq_no + 1)).one()
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        if worksheet_below is None:
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            raise NotFound('worksheet_above')
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        worksheet_below.seq_no = worksheet_below.seq_no - 1
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        worksheet_above.seq_no = worksheet_above.seq_no + 1
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        return {'result': 'ok'}