sponsors/models.py

   1 # -*- coding: utf-8 -*-
   2 # This file is part of django-sponsors, licensed under GNU Affero GPLv3 or later.
   3 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
   4 #
   5 import time
   6 from StringIO import StringIO
   7 from django.conf import settings
   8 from django.db import models
   9 from django.utils.translation import ugettext_lazy as _
  10 from django.template.loader import render_to_string
  11 from PIL import Image
  12
  13 from jsonfield import JSONField
  14 from django.core.files.base import ContentFile
  15
  16 THUMB_WIDTH = getattr(settings, 'SPONSORS_THUMB_WIDTH', 120)
  17 THUMB_HEIGHT = getattr(settings, 'SPONSORS_THUMB_HEIGHT', 120)
  18
  19
  20 class Sponsor(models.Model):
  21     name = models.CharField(_('name'), max_length=120)
  22     _description = models.CharField(_('description'), blank=True, max_length=255)
  23     logo = models.ImageField(_('logo'), upload_to='sponsorzy/sponsor/logo')
  24     url = models.URLField(_('url'), blank=True, verify_exists=False)
  25
  26     def __unicode__(self):
  27         return self.name
  28
  29     def description(self):
  30         if len(self._description):
  31             return self._description
  32         else:
  33             return self.name
  34
  35     def size(self):
  36         width, height = THUMB_WIDTH, THUMB_HEIGHT
  37         if width is None:
  38             simg = Image.open(self.logo.path)
  39             width = int(float(simg.size[0]) / simg.size[1] * height)
  40         elif height is None:
  41             simg = Image.open(self.logo.path)
  42             height = int(float(simg.size[1]) / simg.size[0] * width)
  43         return width, height
  44
  45
  46 class SponsorPage(models.Model):
  47     name = models.CharField(_('name'), max_length=120)
  48     sponsors = JSONField(_('sponsors'), default={})
  49     _html = models.TextField(blank=True, editable=False)
  50     sprite = models.ImageField(upload_to='sponsorzy/sprite', blank=True)
  51
  52     def populated_sponsors(self):
  53         result = []
  54         offset = 0
  55         for column in self.sponsors:
  56             result_group = {'name': column['name'], 'sponsors': []}
  57             sponsor_objects = Sponsor.objects.in_bulk(column['sponsors'])
  58             for sponsor_pk in column['sponsors']:
  59                 try:
  60                     sponsor = sponsor_objects[sponsor_pk]
  61                 except KeyError:
  62                     pass
  63                 else:
  64                     result_group['sponsors'].append((offset, sponsor))
  65                     offset -= sponsor.size()[1]
  66             result.append(result_group)
  67         return result
  68
  69     def render_sprite(self):
  70         sponsor_ids = []
  71         for column in self.sponsors:
  72             sponsor_ids.extend(column['sponsors'])
  73         sponsors = Sponsor.objects.in_bulk(sponsor_ids)
  74         total_width = 0
  75         total_height = 0
  76         for sponsor in sponsors.values():
  77             w, h = sponsor.size()
  78             total_width = max(total_width, w)
  79             total_height += h
  80         sprite = Image.new('RGBA', (total_width, total_height))
  81         offset = 0
  82         for i, sponsor_id in enumerate(sponsor_ids):
  83             sponsor = sponsors[sponsor_id]
  84             simg = Image.open(sponsor.logo.path)
  85             thumb_size = sponsor.size()
  86             # FIXME: This is too complicated now.
  87             if simg.size[0] > thumb_size[0] or simg.size[1] > thumb_size[1]:
  88                 size = (
  89                     min(thumb_size[0],
  90                         simg.size[0] * thumb_size[1] / simg.size[1]),
  91                     min(thumb_size[1],
  92                         simg.size[1] * thumb_size[0] / simg.size[0])
  93                 )
  94                 simg = simg.resize(size, Image.ANTIALIAS)
  95             sprite.paste(simg, (
  96                     (thumb_size[0] - simg.size[0]) / 2,
  97                     offset + (thumb_size[1] - simg.size[1]) / 2,
  98                     ))
  99             offset += thumb_size[1]
 100         imgstr = StringIO()
 101         sprite.save(imgstr, 'png')
 102
 103         if self.sprite:
 104             self.sprite.delete(save=False)
 105         self.sprite.save('sponsorzy/sprite/%s-%d.png' % (self.name, time.time()), ContentFile(imgstr.getvalue()), save=False)
 106
 107     def html(self):
 108         return self._html
 109     html = property(fget=html)
 110
 111     def save(self, *args, **kwargs):
 112         self.render_sprite()
 113         self._html = render_to_string('sponsors/page.html', {
 114             'sponsors': self.populated_sponsors(),
 115             'page': self,
 116         })
 117         return super(SponsorPage, self).save(*args, **kwargs)
 118
 119     def __unicode__(self):
 120         return self.name
 121