src/sponsors/models.py

   1 # -*- coding: utf-8 -*-
   2 # This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
   3 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
   4 #
   5 import json
   6 import time
   7 from io import BytesIO
   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 from ssify import flush_ssi_includes
  16
  17 THUMB_WIDTH = 120
  18 THUMB_HEIGHT = 120
  19
  20
  21 class Sponsor(models.Model):
  22     name = models.CharField(_('name'), max_length=120)
  23     _description = models.CharField(_('description'), blank=True, max_length=255)
  24     logo = models.ImageField(_('logo'), upload_to='sponsorzy/sponsor/logo')
  25     url = models.URLField(_('url'), blank=True)
  26
  27     def __str__(self):
  28         return self.name
  29
  30     def description(self):
  31         if len(self._description):
  32             return self._description
  33         else:
  34             return self.name
  35
  36
  37 class SponsorPage(models.Model):
  38     name = models.CharField(_('name'), max_length=120)
  39     sponsors = JSONField(_('sponsors'), default={})
  40     _html = models.TextField(blank=True, editable=False)
  41     sprite = models.ImageField(upload_to='sponsorzy/sprite', blank=True)
  42
  43     def populated_sponsors(self):
  44         result = []
  45         offset = 0
  46         for column in self.sponsors:
  47             result_group = {'name': column['name'], 'sponsors': []}
  48             sponsor_objects = Sponsor.objects.in_bulk(column['sponsors'])
  49             for sponsor_pk in column['sponsors']:
  50                 try:
  51                     result_group['sponsors'].append((offset, sponsor_objects[sponsor_pk]))
  52                     offset -= THUMB_HEIGHT
  53                 except KeyError:
  54                     pass
  55             result.append(result_group)
  56         return result
  57
  58     def render_sprite(self):
  59         sponsor_ids = []
  60         for column in self.sponsors:
  61             sponsor_ids.extend(column['sponsors'])
  62         sponsors = Sponsor.objects.in_bulk(sponsor_ids)
  63         sprite = Image.new('RGBA', (THUMB_WIDTH, len(sponsors) * THUMB_HEIGHT))
  64         for i, sponsor_id in enumerate(sponsor_ids):
  65             simg = Image.open(sponsors[sponsor_id].logo.path)
  66             if simg.size[0] > THUMB_WIDTH or simg.size[1] > THUMB_HEIGHT:
  67                 size = (
  68                     min(THUMB_WIDTH,
  69                         round(simg.size[0] * THUMB_HEIGHT / simg.size[1])),
  70                     min(THUMB_HEIGHT,
  71                         round(simg.size[1] * THUMB_WIDTH / simg.size[0]))
  72                 )
  73                 simg = simg.resize(size, Image.ANTIALIAS)
  74             sprite.paste(simg, (
  75                     round((THUMB_WIDTH - simg.size[0]) / 2),
  76                     round(i * THUMB_HEIGHT + (THUMB_HEIGHT - simg.size[1]) / 2),
  77                     ))
  78         imgstr = BytesIO()
  79         sprite.save(imgstr, 'png')
  80
  81         if self.sprite:
  82             self.sprite.delete(save=False)
  83         self.sprite.save('sponsorzy/sprite/%s-%d.png' % (
  84             self.name, time.time()), ContentFile(imgstr.getvalue()), save=False)
  85
  86     def html(self):
  87         return self._html
  88     html = property(fget=html)
  89
  90     def save(self, *args, **kwargs):
  91         if isinstance(self.sponsors, str):
  92             # Walkaround for weird jsonfield 'no-decode' optimization.
  93             self.sponsors = json.loads(self.sponsors)
  94         self.render_sprite()
  95         self._html = render_to_string('sponsors/page.html', {
  96             'sponsors': self.populated_sponsors(),
  97             'page': self
  98         })
  99         ret = super(SponsorPage, self).save(*args, **kwargs)
 100         self.flush_includes()
 101         return ret
 102
 103     def flush_includes(self):
 104         flush_ssi_includes(['/sponsors/page/%s.html' % self.name])
 105
 106     def __str__(self):
 107         return self.name