karmaworld/apps/notes/models.py

   1 #!/usr/bin/env python
   2 # -*- coding:utf8 -*-
   3 # Copyright (C) 2012  FinalsClub Foundation
   4
   5 """
   6     Models for the notes django app.
   7     Contains only the minimum for handling files and their representation
   8 """
   9 import datetime
  10
  11 from django.conf import settings
  12 from django.core.files.storage import FileSystemStorage
  13 from django.db import models
  14 from django.template import defaultfilters
  15 from taggit.managers import TaggableManager
  16 from oauth2client.client import Credentials
  17
  18 from karmaworld.apps.courses.models import Course
  19
  20 try:
  21     from secrets.drive import GOOGLE_USER
  22 except:
  23     GOOGLE_USER = u'admin@karmanotes.org'
  24
  25 fs = FileSystemStorage(location=settings.MEDIA_ROOT)
  26
  27 class Note(models.Model):
  28     """ A django model representing an uploaded file and associated metadata.
  29     """
  30     UNKNOWN_FILE = '???'
  31     FILE_TYPE_CHOICES = (
  32         ('doc', 'MS Word compatible file (.doc, .docx, .rtf, .odf)'),
  33         ('img', 'Scan or picture of notes'),
  34         ('pdf', 'PDF file'),
  35         (UNKNOWN_FILE, 'Unknown file'),
  36     )
  37
  38     course          = models.ForeignKey(Course)
  39     # Tagging system
  40     tags            = TaggableManager(blank=True)
  41
  42     name            = models.CharField(max_length=255, blank=True, null=True)
  43     slug            = models.SlugField(max_length=255, null=True)
  44     year            = models.IntegerField(blank=True, null=True,
  45                         default=datetime.datetime.utcnow().year)
  46     desc            = models.TextField(max_length=511, blank=True, null=True)
  47     uploaded_at     = models.DateTimeField(null=True, default=datetime.datetime.utcnow)
  48
  49     file_type       = models.CharField(max_length=15,
  50                             choices=FILE_TYPE_CHOICES,
  51                             default=UNKNOWN_FILE,
  52                             blank=True, null=True)
  53
  54     # Upload files to MEDIA_ROOT/notes/YEAR/MONTH/DAY, 2012/10/30/filename
  55     note_file       = models.FileField(
  56                             storage=fs,
  57                             upload_to="notes/%Y/%m/%j/",
  58                             blank=True, null=True)
  59
  60     ## post gdrive conversion data
  61     embed_url       = models.URLField(max_length=1024, blank=True, null=True)
  62     download_url    = models.URLField(max_length=1024, blank=True, null=True)
  63     # for word processor documents
  64     html            = models.TextField(blank=True, null=True)
  65     text            = models.TextField(blank=True, null=True)
  66
  67
  68     class Meta:
  69         """ Sort files by most recent first """
  70         ordering = ['-uploaded_at']
  71
  72
  73     def __unicode__(self):
  74         return u"{0}: {1} -- {2}".format(self.file_type, self.name, self.uploaded_at)
  75
  76     def save(self, *args, **kwargs):
  77         """ override built-in save to ensure contextual self.name """
  78         # TODO: If self.name isn't set, generate one based on uploaded_name
  79         # if we fail to set the Note.name earlier than this, use the saved filename
  80
  81         if not self.slug and self.name:
  82             # only generate a slug if the name has been set, and slug hasn't
  83             self.slug = defaultfilters.slugify(self.name)
  84
  85         # Check if Note.uploaded_at is after Course.updated_at
  86         if self.uploaded_at and self.uploaded_at > self.course.updated_at:
  87             self.course.updated_at = self.uploaded_at
  88             # if it is, update Course.updated_at
  89             self.course.save()
  90
  91         super(Note, self).save(*args, **kwargs)
  92
  93     def get_absolute_url(self):
  94         """ Resolve note url, use 'note' route and slug if slug
  95             otherwise use note.id
  96         """
  97         if self.slug is not None:
  98             # return a url ending in slug
  99             return u"/{0}/{1}/{2}".format(self.course.school.slug, self.course.slug, self.slug)
 100         else:
 101             # return a url ending in id
 102             return u"/{0}/{1}/{2}".format(self.course.school.slug, self.course.slug, self.id)
 103
 104
 105 class DriveAuth(models.Model):
 106     """ stored google drive authentication and refresh token
 107         used for interacting with google drive """
 108
 109     email = models.EmailField(default=GOOGLE_USER)
 110     credentials = models.TextField() # JSON of Oauth2Credential object
 111     stored_at = models.DateTimeField(auto_now=True)
 112
 113
 114     @staticmethod
 115     def get(email=GOOGLE_USER):
 116         """ Staticmethod for getting the singleton DriveAuth object """
 117         # FIXME: this is untested
 118         return DriveAuth.objects.filter(email=email).reverse()[0]
 119
 120
 121     def store(self, creds):
 122         """ Transform an existing credentials object to a db serialized """
 123         self.email = creds.id_token['email']
 124         self.credentials = creds.to_json()
 125         self.save()
 126
 127
 128     def transform_to_cred(self):
 129         """ take stored credentials and produce a Credentials object """
 130         return Credentials.new_from_json(self.credentials)
 131
 132
 133     def __unicode__(self):
 134         return u'Gdrive auth for %s created/updated at %s' % \
 135                     (self.email, self.stored_at)