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 (UNKNOWN_FILE, 'Unknown file'),
39 course = models.ForeignKey(Course)
41 tags = TaggableManager(blank=True)
43 name = models.CharField(max_length=255, blank=True, null=True)
44 slug = models.SlugField(max_length=255, null=True)
45 year = models.IntegerField(blank=True, null=True,
46 default=datetime.datetime.utcnow().year)
47 desc = models.TextField(max_length=511, blank=True, null=True)
48 uploaded_at = models.DateTimeField(null=True, default=datetime.datetime.utcnow)
50 file_type = models.CharField(max_length=15,
51 choices=FILE_TYPE_CHOICES,
53 blank=True, null=True)
55 # Upload files to MEDIA_ROOT/notes/YEAR/MONTH/DAY, 2012/10/30/filename
56 # FIXME: because we are adding files by hand in tasks.py, upload_to is being ignored for media files
57 note_file = models.FileField(
59 upload_to="notes/%Y/%m/%j/",
60 blank=True, null=True)
62 ## post gdrive conversion data
63 embed_url = models.URLField(max_length=1024, blank=True, null=True)
64 download_url = models.URLField(max_length=1024, blank=True, null=True)
65 # for word processor documents
66 html = models.TextField(blank=True, null=True)
67 text = models.TextField(blank=True, null=True)
71 """ Sort files by most recent first """
72 ordering = ['-uploaded_at']
75 def __unicode__(self):
76 return u"{0}: {1} -- {2}".format(self.file_type, self.name, self.uploaded_at)
78 def save(self, *args, **kwargs):
79 """ override built-in save to ensure contextual self.name """
80 # TODO: If self.name isn't set, generate one based on uploaded_name
81 # if we fail to set the Note.name earlier than this, use the saved filename
83 # only generate a slug if the name has been set, and slug hasn't
84 if not self.slug and self.name:
85 slug = defaultfilters.slugify(self.name)
86 cursor = Note.objects.filter(slug=slug)
87 # If there are no other notes with this slug, then the slug does not need an id
88 if cursor.count() == 0:
91 super(Note, self).save(*args, **kwargs) # generate self.id
92 self.slug = defaultfilters.slugify("%s %s" % (self.name, self.id))
93 super(Note, self).save(*args, **kwargs)
95 # Check if Note.uploaded_at is after Course.updated_at
96 if self.uploaded_at and self.uploaded_at > self.course.updated_at:
97 self.course.updated_at = self.uploaded_at
98 # if it is, update Course.updated_at
101 super(Note, self).save(*args, **kwargs)
103 def get_absolute_url(self):
104 """ Resolve note url, use 'note' route and slug if slug
105 otherwise use note.id
107 if self.slug is not None:
108 # return a url ending in slug
109 return u"/{0}/{1}/{2}".format(self.course.school.slug, self.course.slug, self.slug)
111 # return a url ending in id
112 return u"/{0}/{1}/{2}".format(self.course.school.slug, self.course.slug, self.id)
114 def sanitize_html(self, save=True):
115 """ if self contains html, find all <a> tags and add target=_blank
117 returns True/False on succ/fail and error or count
119 # build a tag sanitizer
120 def add_attribute_target(tag):
121 tag.attrib['target'] = '_blank'
123 # if no html, return false
125 return False, "Note has no html"
127 _html = fromstring(self.html)
128 a_tags = _html.findall('.//a') # recursively find all a tags in document tree
129 # if there are a tags
131 #apply the add attribute function
132 map(add_attribute_target, a_tags)
136 return True, len(a_tags)
140 class DriveAuth(models.Model):
141 """ stored google drive authentication and refresh token
142 used for interacting with google drive """
144 email = models.EmailField(default=GOOGLE_USER)
145 credentials = models.TextField() # JSON of Oauth2Credential object
146 stored_at = models.DateTimeField(auto_now=True)
150 def get(email=GOOGLE_USER):
151 """ Staticmethod for getting the singleton DriveAuth object """
152 # FIXME: this is untested
153 return DriveAuth.objects.filter(email=email).reverse()[0]
156 def store(self, creds):
157 """ Transform an existing credentials object to a db serialized """
158 self.email = creds.id_token['email']
159 self.credentials = creds.to_json()
163 def transform_to_cred(self):
164 """ take stored credentials and produce a Credentials object """
165 return Credentials.new_from_json(self.credentials)
168 def __unicode__(self):
169 return u'Gdrive auth for %s created/updated at %s' % \
170 (self.email, self.stored_at)