catalogue/models.py

   1 # -*- coding: utf-8
   2 from django.core.files import File
   3 from django.core.urlresolvers import reverse
   4 from django.db import models
   5 from jsonfield import JSONField
   6 from fnpdjango.storage import BofhFileSystemStorage
   7 from curriculum.models import Level, Curriculum, CurriculumCourse
   8 import logging
   9
  10 bofh_storage = BofhFileSystemStorage()
  11
  12
  13 class Section(models.Model):
  14     title = models.CharField(max_length=255, unique=True)
  15     slug = models.SlugField(max_length=255, unique=True)
  16     order = models.IntegerField()
  17     xml_file = models.FileField(upload_to="catalogue/section/xml",
  18         null=True, blank=True, max_length=255,
  19         storage=bofh_storage)
  20     image = models.ImageField(upload_to="catalogue/section/image",
  21         null=True, blank=True)
  22
  23     pic = models.ImageField(upload_to="catalogue/section/pic", null=True, blank=True)
  24     pic_attribution = models.CharField(max_length=255, null=True, blank=True)
  25     pic_src = models.URLField(null=True, blank=True)
  26
  27     summary = models.TextField(blank=True, null=True)
  28
  29     class Meta:
  30         ordering = ['order']
  31
  32     class IncompleteError(BaseException):
  33         pass
  34
  35     def __unicode__(self):
  36         return self.title
  37
  38     def get_absolute_url(self):
  39         return "%s#gimnazjum_%s" % (reverse("catalogue_lessons"), self.slug)
  40
  41     @classmethod
  42     def publish(cls, infile, ignore_incomplete=False):
  43         from librarian.parser import WLDocument
  44         from django.core.files.base import ContentFile
  45         xml = infile.get_string()
  46         wldoc = WLDocument.from_string(xml)
  47
  48         lessons = []
  49         for part in wldoc.book_info.parts:
  50             try:
  51                 lessons.append(Lesson.objects.get(slug=part.slug))
  52             except Lesson.DoesNotExist, e:
  53                 if not ignore_incomplete:
  54                     raise cls.IncompleteError(part.slug)
  55
  56         slug = wldoc.book_info.url.slug
  57         try:
  58             section = cls.objects.get(slug=slug)
  59         except cls.DoesNotExist:
  60             section = cls(slug=slug, order=0)
  61
  62         # Save XML file
  63         section.xml_file.save('%s.xml' % slug, ContentFile(xml), save=False)
  64         section.title = wldoc.book_info.title
  65         section.save()
  66
  67         section.lesson_set.all().update(section=None)
  68         for i, lesson in enumerate(lessons):
  69             lesson.section = section
  70             lesson.order = i
  71             lesson.save()
  72
  73         return section
  74
  75     def syntetic_lesson(self, level):
  76         try:
  77             return self.lesson_set.filter(type='synthetic', level=level)[0]
  78         except IndexError:
  79             return None
  80
  81
  82 class Lesson(models.Model):
  83     section = models.ForeignKey(Section, null=True, blank=True)
  84     level = models.ForeignKey(Level)
  85     title = models.CharField(max_length=255)
  86     slug = models.SlugField(max_length=255, unique=True)
  87     type = models.CharField(max_length=15, db_index=True)
  88     order = models.IntegerField(db_index=True)
  89     dc = JSONField(default='{}')
  90     curriculum_courses = models.ManyToManyField(CurriculumCourse, blank=True)
  91     description = models.TextField(null=True, blank=True)
  92
  93     xml_file = models.FileField(upload_to="catalogue/lesson/xml",
  94         null=True, blank=True, max_length=255, storage=bofh_storage)
  95     html_file = models.FileField(upload_to="catalogue/lesson/html",
  96         null=True, blank=True, max_length=255, storage=bofh_storage)
  97     package = models.FileField(upload_to="catalogue/lesson/pack",
  98         null=True, blank=True, max_length=255, storage=bofh_storage)
  99     student_package = models.FileField(upload_to="catalogue/lesson/student_pack",
 100         null=True, blank=True, max_length=255, storage=bofh_storage)
 101     pdf = models.FileField(upload_to="catalogue/lesson/pdf",
 102         null=True, blank=True, max_length=255, storage=bofh_storage)
 103     student_pdf = models.FileField(upload_to="catalogue/lesson/student_pdf",
 104         null=True, blank=True, max_length=255, storage=bofh_storage)
 105
 106     class Meta:
 107         ordering = ['section', 'level', 'order']
 108
 109     def __unicode__(self):
 110         return self.title
 111
 112     @models.permalink
 113     def get_absolute_url(self):
 114         return ('catalogue_lesson', [self.slug])
 115
 116     @classmethod
 117     def publish(cls, infile, ignore_incomplete=False):
 118         from librarian.parser import WLDocument
 119         from django.core.files.base import ContentFile
 120         xml = infile.get_string()
 121         wldoc = WLDocument.from_string(xml)
 122
 123         # Check if not section metadata block.
 124         if wldoc.book_info.parts:
 125             return Section.publish(infile, ignore_incomplete=ignore_incomplete)
 126
 127         slug = wldoc.book_info.url.slug
 128         try:
 129             lesson = cls.objects.get(slug=slug)
 130             lesson.attachment_set.all().delete()
 131         except cls.DoesNotExist:
 132             lesson = cls(slug=slug, order=0)
 133
 134         # Save XML file
 135         lesson.xml_file.save('%s.xml' % slug, ContentFile(xml), save=False)
 136         lesson.title = wldoc.book_info.title
 137
 138         lesson.level = Level.objects.get(meta_name=wldoc.book_info.audience)
 139         lesson.populate_dc()
 140         lesson.populate_description(wldoc=wldoc)
 141         lesson.build_html(infile=infile)
 142         lesson.build_pdf()
 143         lesson.build_package()
 144         if lesson.type != 'project':
 145             lesson.build_pdf(student=True)
 146             lesson.build_package(student=True)
 147         return lesson
 148
 149     def populate_dc(self):
 150         from librarian.parser import WLDocument
 151         wldoc = WLDocument.from_file(self.xml_file.path)
 152         self.dc = wldoc.book_info.to_dict()
 153         self.type = self.dc["type"]
 154         assert self.type in ('appendix', 'course', 'synthetic', 'project'), \
 155             u"Unknown lesson type: %s" % self.type
 156         self.save()
 157
 158         courses = set()
 159         for identifier in wldoc.book_info.curriculum:
 160             identifier = (identifier or "").replace(' ', '')
 161             if not identifier: continue
 162             try:
 163                 curr = Curriculum.objects.get(identifier__iexact=identifier)
 164             except Curriculum.DoesNotExist:
 165                 logging.warn('Unknown curriculum course %s in lesson %s' % (identifier, self.slug))
 166                 pass
 167             else:
 168                 courses.add(curr.course)
 169         self.curriculum_courses = courses
 170
 171     def populate_description(self, wldoc=None, infile=None):
 172         if wldoc is None:
 173             wldoc = self.wldocument(infile)
 174         if self.type == 'project':
 175             lookup = u'Zadanie'
 176         else:
 177             lookup = u'Pomysł na lekcję'
 178         for header in wldoc.edoc.findall('.//naglowek_rozdzial'):
 179             if (header.text or '').strip() == lookup:
 180                 from lxml import etree
 181                 self.description = etree.tostring(header.getnext(),
 182                         method='text', encoding='unicode').strip()
 183                 self.save()
 184                 return
 185
 186     def wldocument(self, infile=None):
 187         from librarian import IOFile
 188         from librarian.parser import WLDocument
 189         from .publish import OrmDocProvider
 190
 191         if infile is None:
 192             infile = IOFile.from_filename(self.xml_file.path)
 193             for att in self.attachment_set.all():
 194                 infile.attachments["%s.%s" % (att.slug, att.ext)] = \
 195                     IOFile.from_filename(att.file.path)
 196         return WLDocument(infile, provider=OrmDocProvider())
 197
 198     def build_html(self, infile=None):
 199         from .publish import HtmlFormat
 200         wldoc = self.wldocument(infile)
 201         html = HtmlFormat(wldoc).build()
 202         self.html_file.save("%s.html" % self.slug,
 203             File(open(html.get_filename())))
 204
 205     def build_pdf(self, student=False):
 206         from .publish import PdfFormat
 207         # PDF uses document with attachments already saved as media,
 208         # otherwise sorl.thumbnail complains about SuspiciousOperations.
 209         wldoc = self.wldocument()
 210         if student:
 211             pdf = PdfFormat(wldoc).build()
 212             self.student_pdf.save("%s.pdf" % self.slug,
 213                 File(open(pdf.get_filename())))
 214         else:
 215             pdf = PdfFormat(wldoc, teacher=True).build()
 216             self.pdf.save("%s.pdf" % self.slug,
 217                 File(open(pdf.get_filename())))
 218
 219     def add_to_zip(self, zipf, student=False, prefix=''):
 220         pdf = self.student_pdf if student else self.pdf
 221         if pdf:
 222             zipf.write(pdf.path,
 223                 "%s%s%s.pdf" % (prefix, self.slug, "_student" if student else ""))
 224             for attachment in self.attachment_set.all():
 225                 zipf.write(attachment.file.path,
 226                     u"%smaterialy/%s.%s" % (prefix, attachment.slug, attachment.ext))
 227             zipf.write(self.xml_file.path,
 228                 "%spliki-zrodlowe/%s.xml" % (prefix, self.slug))
 229
 230     def build_package(self, student=False):
 231         from StringIO import StringIO
 232         import zipfile
 233         from django.core.files.base import ContentFile
 234         buff = StringIO()
 235         zipf = zipfile.ZipFile(buff, 'w', zipfile.ZIP_STORED)
 236         self.add_to_zip(zipf, student)
 237         zipf.close()
 238         fieldname = "student_package" if student else "package"
 239         getattr(self, fieldname).save(
 240             "%s%s.zip" % (self.slug, "_student" if student else ""),
 241             ContentFile(buff.getvalue()))
 242
 243     def get_syntetic(self):
 244         if self.section is None: return None
 245         return self.section.syntetic_lesson(self.level)
 246
 247     def get_other_level(self):
 248         if self.section is None: return None
 249         other_levels = self.section.lesson_set.exclude(level=self.level)
 250         if other_levels.exists():
 251             return other_levels[0].level
 252
 253     def get_previous(self):
 254         if self.section is None: return None
 255         try:
 256             return self.section.lesson_set.filter(
 257                 type=self.type, level=self.level,
 258                 order__lt=self.order).order_by('-order')[0]
 259         except IndexError:
 260             return None
 261
 262     def get_next(self):
 263         if self.section is None: return None
 264         try:
 265             return self.section.lesson_set.filter(
 266                 type=self.type, level=self.level,
 267                 order__gt=self.order).order_by('order')[0]
 268         except IndexError:
 269             return None
 270
 271     def requires_internet(self):
 272         return 'internet' in self.dc.get('requires', [])
 273
 274
 275 class Attachment(models.Model):
 276     slug = models.CharField(max_length=255)
 277     ext = models.CharField(max_length=15)
 278     lesson = models.ForeignKey(Lesson)
 279     file = models.FileField(upload_to="catalogue/attachment", storage=bofh_storage)
 280
 281     class Meta:
 282         ordering = ['slug', 'ext']
 283         unique_together = ['lesson', 'slug', 'ext']
 284
 285     def __unicode__(self):
 286         return "%s.%s" % (self.slug, self.ext)
 287
 288
 289 class Part(models.Model):
 290     lesson = models.ForeignKey(Lesson)
 291     pdf = models.FileField(upload_to="catalogue/part/pdf",
 292         null=True, blank=True)
 293     student_pdf = models.FileField(upload_to="catalogue/part/student_pdf",
 294         null=True, blank=True)
 295
 296
 297 class LessonStub(models.Model):
 298     section = models.ForeignKey(Section, null=True, blank=True)
 299     level = models.ForeignKey(Level)
 300     title = models.CharField(max_length=255)
 301     type = models.CharField(max_length=15, db_index=True)
 302     order = models.IntegerField(db_index=True)
 303
 304     class Meta:
 305         ordering = ['section', 'level', 'order']
 306
 307     def __unicode__(self):
 308         return self.title
 309
 310     @property
 311     def slug(self):
 312         return ''
 313
 314     def add_to_zip(self, *args, **kwargs):
 315         pass