3 # Copyright (C) 2012 FinalsClub Foundation
6 Models for the notes django app.
7 Contains only the minimum for handling files and their representation
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 lxml.html import fromstring, tostring
16 from oauth2client.client import Credentials
17 from taggit.managers import TaggableManager
19 from karmaworld.apps.courses.models import Course
22 from secrets.drive import GOOGLE_USER
24 GOOGLE_USER = u'admin@karmanotes.org'
26 fs = FileSystemStorage(location=settings.MEDIA_ROOT)
28 class Note(models.Model):
29 """ A django model representing an uploaded file and associated metadata.
33 ('doc', 'MS Word compatible file (.doc, .docx, .rtf, .odf)'),
34 ('img', 'Scan or picture of notes'),
36 ('ppt', 'Powerpoint'),
37 (UNKNOWN_FILE, 'Unknown file'),
40 course = models.ForeignKey(Course)
42 tags = TaggableManager(blank=True)
44 name = models.CharField(max_length=255, blank=True, null=True)
45 slug = models.SlugField(max_length=255, null=True)
46 year = models.IntegerField(blank=True, null=True,
47 default=datetime.datetime.utcnow().year)
48 desc = models.TextField(max_length=511, blank=True, null=True)
49 uploaded_at = models.DateTimeField(null=True, default=datetime.datetime.utcnow)
51 file_type = models.CharField(max_length=15,
52 choices=FILE_TYPE_CHOICES,
54 blank=True, null=True)
56 # Upload files to MEDIA_ROOT/notes/YEAR/MONTH/DAY, 2012/10/30/filename
57 # FIXME: because we are adding files by hand in tasks.py, upload_to is being ignored for media files
58 note_file = models.FileField(
60 upload_to="notes/%Y/%m/%j/",
61 blank=True, null=True)
62 pdf_file = models.FileField(
64 upload_to="notes/%Y/%m/%j/",
65 blank=True, null=True)
67 ## post gdrive conversion data
68 embed_url = models.URLField(max_length=1024, blank=True, null=True)
69 download_url = models.URLField(max_length=1024, blank=True, null=True)
70 # for word processor documents
71 html = models.TextField(blank=True, null=True)
72 text = models.TextField(blank=True, null=True)
76 """ Sort files by most recent first """
77 ordering = ['-uploaded_at']
80 def __unicode__(self):
81 return u"{0}: {1} -- {2}".format(self.file_type, self.name, self.uploaded_at)
83 def save(self, *args, **kwargs):
84 """ override built-in save to ensure contextual self.name """
85 # TODO: If self.name isn't set, generate one based on uploaded_name
86 # if we fail to set the Note.name earlier than this, use the saved filename
88 # only generate a slug if the name has been set, and slug hasn't
89 if not self.slug and self.name:
90 slug = defaultfilters.slugify(self.name)
91 cursor = Note.objects.filter(slug=slug)
92 # If there are no other notes with this slug, then the slug does not need an id
93 if cursor.count() == 0:
96 super(Note, self).save(*args, **kwargs) # generate self.id
97 self.slug = defaultfilters.slugify("%s %s" % (self.name, self.id))
98 super(Note, self).save(*args, **kwargs)
100 # Check if Note.uploaded_at is after Course.updated_at
101 if self.uploaded_at and self.uploaded_at > self.course.updated_at:
102 self.course.updated_at = self.uploaded_at
103 # if it is, update Course.updated_at
106 super(Note, self).save(*args, **kwargs)
108 def get_absolute_url(self):
109 """ Resolve note url, use 'note' route and slug if slug
110 otherwise use note.id
112 if self.slug is not None:
113 # return a url ending in slug
114 return u"/{0}/{1}/{2}".format(self.course.school.slug, self.course.slug, self.slug)
116 # return a url ending in id
117 return u"/{0}/{1}/{2}".format(self.course.school.slug, self.course.slug, self.id)
119 def sanitize_html(self, save=True):
120 """ if self contains html, find all <a> tags and add target=_blank
122 returns True/False on succ/fail and error or count
124 # build a tag sanitizer
125 def add_attribute_target(tag):
126 tag.attrib['target'] = '_blank'
128 # if no html, return false
130 return False, "Note has no html"
132 _html = fromstring(self.html)
133 a_tags = _html.findall('.//a') # recursively find all a tags in document tree
134 # if there are a tags
136 #apply the add attribute function
137 map(add_attribute_target, a_tags)
141 return True, len(a_tags)
145 class DriveAuth(models.Model):
146 """ stored google drive authentication and refresh token
147 used for interacting with google drive """
149 email = models.EmailField(default=GOOGLE_USER)
150 credentials = models.TextField() # JSON of Oauth2Credential object
151 stored_at = models.DateTimeField(auto_now=True)
155 def get(email=GOOGLE_USER):
156 """ Staticmethod for getting the singleton DriveAuth object """
157 # FIXME: this is untested
158 return DriveAuth.objects.filter(email=email).reverse()[0]
161 def store(self, creds):
162 """ Transform an existing credentials object to a db serialized """
163 self.email = creds.id_token['email']
164 self.credentials = creds.to_json()
168 def transform_to_cred(self):
169 """ take stored credentials and produce a Credentials object """
170 return Credentials.new_from_json(self.credentials)
173 def __unicode__(self):
174 return u'Gdrive auth for %s created/updated at %s' % \
175 (self.email, self.stored_at)