Pinry/pinry/pins/models.py

from django.db import models
from django.core.files import File
from django.core.files.temp import NamedTemporaryFile
from django.contrib.auth.models import User

from taggit.managers import TaggableManager
import urllib2
import os
from PIL import Image


class Pin(models.Model):
    submitter = models.ForeignKey(User)
    url = models.TextField(blank=True, null=True)
    description = models.TextField(blank=True, null=True)
    image = models.ImageField(upload_to='pins/pin/originals/')
    thumbnail = models.ImageField(upload_to='pins/pin/thumbnails/')
    published = models.DateTimeField(auto_now_add=True)
    tags = TaggableManager()


    def __unicode__(self):
        return self.url


    def save(self, *args, **kwargs):
        hash_name = os.urandom(32).encode('hex')

        if not self.image:
            temp_img = NamedTemporaryFile()
            temp_img.write(urllib2.urlopen(self.url).read())
            temp_img.flush()
            image = Image.open(temp_img.name)
            if image.mode != "RGB":
                image = image.convert("RGB")
            image.save(temp_img.name, 'JPEG')
            self.image.save(''.join([hash_name, '.jpg']), File(temp_img))

        if not self.thumbnail:
            if not self.image:
                image = Image.open(temp_img.name)
            else:
                super(Pin, self).save()
                image = Image.open(self.image.path)
            size = image.size
            prop = 200.0 / float(image.size[0])
            size = (int(prop*float(image.size[0])), int(prop*float(image.size[1])))
            image.thumbnail(size, Image.ANTIALIAS)
            temp_thumb = NamedTemporaryFile()
            if image.mode != "RGB":
                image = image.convert("RGB")
            image.save(temp_thumb.name, 'JPEG')
            self.thumbnail.save(''.join([hash_name, '.jpg']), File(temp_thumb))

        super(Pin, self).save(*args, **kwargs)


    class Meta:
        ordering = ['-id']